1 //===-- X86ISelLowering.cpp - X86 DAG Lowering Implementation -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that X86 uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #include "X86ISelLowering.h"
16 #include "Utils/X86ShuffleDecode.h"
17 #include "X86CallingConv.h"
18 #include "X86FrameLowering.h"
19 #include "X86InstrBuilder.h"
20 #include "X86MachineFunctionInfo.h"
21 #include "X86TargetMachine.h"
22 #include "X86TargetObjectFile.h"
23 #include "llvm/ADT/SmallBitVector.h"
24 #include "llvm/ADT/SmallSet.h"
25 #include "llvm/ADT/Statistic.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/StringSwitch.h"
28 #include "llvm/Analysis/EHPersonalities.h"
29 #include "llvm/CodeGen/IntrinsicLowering.h"
30 #include "llvm/CodeGen/MachineFrameInfo.h"
31 #include "llvm/CodeGen/MachineFunction.h"
32 #include "llvm/CodeGen/MachineInstrBuilder.h"
33 #include "llvm/CodeGen/MachineJumpTableInfo.h"
34 #include "llvm/CodeGen/MachineModuleInfo.h"
35 #include "llvm/CodeGen/MachineRegisterInfo.h"
36 #include "llvm/CodeGen/WinEHFuncInfo.h"
37 #include "llvm/IR/CallSite.h"
38 #include "llvm/IR/CallingConv.h"
39 #include "llvm/IR/Constants.h"
40 #include "llvm/IR/DerivedTypes.h"
41 #include "llvm/IR/Function.h"
42 #include "llvm/IR/GlobalAlias.h"
43 #include "llvm/IR/GlobalVariable.h"
44 #include "llvm/IR/Instructions.h"
45 #include "llvm/IR/Intrinsics.h"
46 #include "llvm/MC/MCAsmInfo.h"
47 #include "llvm/MC/MCContext.h"
48 #include "llvm/MC/MCExpr.h"
49 #include "llvm/MC/MCSymbol.h"
50 #include "llvm/Support/CommandLine.h"
51 #include "llvm/Support/Debug.h"
52 #include "llvm/Support/ErrorHandling.h"
53 #include "llvm/Support/MathExtras.h"
54 #include "llvm/Target/TargetOptions.h"
55 #include "X86IntrinsicsInfo.h"
61 #define DEBUG_TYPE "x86-isel"
63 STATISTIC(NumTailCalls, "Number of tail calls");
65 static cl::opt<bool> ExperimentalVectorWideningLegalization(
66 "x86-experimental-vector-widening-legalization", cl::init(false),
67 cl::desc("Enable an experimental vector type legalization through widening "
68 "rather than promotion."),
71 X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM,
72 const X86Subtarget &STI)
73 : TargetLowering(TM), Subtarget(&STI) {
74 X86ScalarSSEf64 = Subtarget->hasSSE2();
75 X86ScalarSSEf32 = Subtarget->hasSSE1();
76 MVT PtrVT = MVT::getIntegerVT(8 * TM.getPointerSize());
78 // Set up the TargetLowering object.
80 // X86 is weird. It always uses i8 for shift amounts and setcc results.
81 setBooleanContents(ZeroOrOneBooleanContent);
82 // X86-SSE is even stranger. It uses -1 or 0 for vector masks.
83 setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
85 // For 64-bit, since we have so many registers, use the ILP scheduler.
86 // For 32-bit, use the register pressure specific scheduling.
87 // For Atom, always use ILP scheduling.
88 if (Subtarget->isAtom())
89 setSchedulingPreference(Sched::ILP);
90 else if (Subtarget->is64Bit())
91 setSchedulingPreference(Sched::ILP);
93 setSchedulingPreference(Sched::RegPressure);
94 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
95 setStackPointerRegisterToSaveRestore(RegInfo->getStackRegister());
97 // Bypass expensive divides on Atom when compiling with O2.
98 if (TM.getOptLevel() >= CodeGenOpt::Default) {
99 if (Subtarget->hasSlowDivide32())
100 addBypassSlowDiv(32, 8);
101 if (Subtarget->hasSlowDivide64() && Subtarget->is64Bit())
102 addBypassSlowDiv(64, 16);
105 if (Subtarget->isTargetKnownWindowsMSVC()) {
106 // Setup Windows compiler runtime calls.
107 setLibcallName(RTLIB::SDIV_I64, "_alldiv");
108 setLibcallName(RTLIB::UDIV_I64, "_aulldiv");
109 setLibcallName(RTLIB::SREM_I64, "_allrem");
110 setLibcallName(RTLIB::UREM_I64, "_aullrem");
111 setLibcallName(RTLIB::MUL_I64, "_allmul");
112 setLibcallCallingConv(RTLIB::SDIV_I64, CallingConv::X86_StdCall);
113 setLibcallCallingConv(RTLIB::UDIV_I64, CallingConv::X86_StdCall);
114 setLibcallCallingConv(RTLIB::SREM_I64, CallingConv::X86_StdCall);
115 setLibcallCallingConv(RTLIB::UREM_I64, CallingConv::X86_StdCall);
116 setLibcallCallingConv(RTLIB::MUL_I64, CallingConv::X86_StdCall);
119 if (Subtarget->isTargetDarwin()) {
120 // Darwin should use _setjmp/_longjmp instead of setjmp/longjmp.
121 setUseUnderscoreSetJmp(false);
122 setUseUnderscoreLongJmp(false);
123 } else if (Subtarget->isTargetWindowsGNU()) {
124 // MS runtime is weird: it exports _setjmp, but longjmp!
125 setUseUnderscoreSetJmp(true);
126 setUseUnderscoreLongJmp(false);
128 setUseUnderscoreSetJmp(true);
129 setUseUnderscoreLongJmp(true);
132 // Set up the register classes.
133 addRegisterClass(MVT::i8, &X86::GR8RegClass);
134 addRegisterClass(MVT::i16, &X86::GR16RegClass);
135 addRegisterClass(MVT::i32, &X86::GR32RegClass);
136 if (Subtarget->is64Bit())
137 addRegisterClass(MVT::i64, &X86::GR64RegClass);
139 for (MVT VT : MVT::integer_valuetypes())
140 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
142 // We don't accept any truncstore of integer registers.
143 setTruncStoreAction(MVT::i64, MVT::i32, Expand);
144 setTruncStoreAction(MVT::i64, MVT::i16, Expand);
145 setTruncStoreAction(MVT::i64, MVT::i8 , Expand);
146 setTruncStoreAction(MVT::i32, MVT::i16, Expand);
147 setTruncStoreAction(MVT::i32, MVT::i8 , Expand);
148 setTruncStoreAction(MVT::i16, MVT::i8, Expand);
150 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
152 // SETOEQ and SETUNE require checking two conditions.
153 setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand);
154 setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand);
155 setCondCodeAction(ISD::SETOEQ, MVT::f80, Expand);
156 setCondCodeAction(ISD::SETUNE, MVT::f32, Expand);
157 setCondCodeAction(ISD::SETUNE, MVT::f64, Expand);
158 setCondCodeAction(ISD::SETUNE, MVT::f80, Expand);
160 // Promote all UINT_TO_FP to larger SINT_TO_FP's, as X86 doesn't have this
162 setOperationAction(ISD::UINT_TO_FP , MVT::i1 , Promote);
163 setOperationAction(ISD::UINT_TO_FP , MVT::i8 , Promote);
164 setOperationAction(ISD::UINT_TO_FP , MVT::i16 , Promote);
166 if (Subtarget->is64Bit()) {
167 if (!Subtarget->useSoftFloat() && Subtarget->hasAVX512())
168 // f32/f64 are legal, f80 is custom.
169 setOperationAction(ISD::UINT_TO_FP , MVT::i32 , Custom);
171 setOperationAction(ISD::UINT_TO_FP , MVT::i32 , Promote);
172 setOperationAction(ISD::UINT_TO_FP , MVT::i64 , Custom);
173 } else if (!Subtarget->useSoftFloat()) {
174 // We have an algorithm for SSE2->double, and we turn this into a
175 // 64-bit FILD followed by conditional FADD for other targets.
176 setOperationAction(ISD::UINT_TO_FP , MVT::i64 , Custom);
177 // We have an algorithm for SSE2, and we turn this into a 64-bit
178 // FILD or VCVTUSI2SS/SD for other targets.
179 setOperationAction(ISD::UINT_TO_FP , MVT::i32 , Custom);
182 // Promote i1/i8 SINT_TO_FP to larger SINT_TO_FP's, as X86 doesn't have
184 setOperationAction(ISD::SINT_TO_FP , MVT::i1 , Promote);
185 setOperationAction(ISD::SINT_TO_FP , MVT::i8 , Promote);
187 if (!Subtarget->useSoftFloat()) {
188 // SSE has no i16 to fp conversion, only i32
189 if (X86ScalarSSEf32) {
190 setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Promote);
191 // f32 and f64 cases are Legal, f80 case is not
192 setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Custom);
194 setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Custom);
195 setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Custom);
198 setOperationAction(ISD::SINT_TO_FP , MVT::i16 , Promote);
199 setOperationAction(ISD::SINT_TO_FP , MVT::i32 , Promote);
202 // Promote i1/i8 FP_TO_SINT to larger FP_TO_SINTS's, as X86 doesn't have
204 setOperationAction(ISD::FP_TO_SINT , MVT::i1 , Promote);
205 setOperationAction(ISD::FP_TO_SINT , MVT::i8 , Promote);
207 if (!Subtarget->useSoftFloat()) {
208 // In 32-bit mode these are custom lowered. In 64-bit mode F32 and F64
209 // are Legal, f80 is custom lowered.
210 setOperationAction(ISD::FP_TO_SINT , MVT::i64 , Custom);
211 setOperationAction(ISD::SINT_TO_FP , MVT::i64 , Custom);
213 if (X86ScalarSSEf32) {
214 setOperationAction(ISD::FP_TO_SINT , MVT::i16 , Promote);
215 // f32 and f64 cases are Legal, f80 case is not
216 setOperationAction(ISD::FP_TO_SINT , MVT::i32 , Custom);
218 setOperationAction(ISD::FP_TO_SINT , MVT::i16 , Custom);
219 setOperationAction(ISD::FP_TO_SINT , MVT::i32 , Custom);
222 setOperationAction(ISD::FP_TO_SINT , MVT::i16 , Promote);
223 setOperationAction(ISD::FP_TO_SINT , MVT::i32 , Expand);
224 setOperationAction(ISD::FP_TO_SINT , MVT::i64 , Expand);
227 // Handle FP_TO_UINT by promoting the destination to a larger signed
229 setOperationAction(ISD::FP_TO_UINT , MVT::i1 , Promote);
230 setOperationAction(ISD::FP_TO_UINT , MVT::i8 , Promote);
231 setOperationAction(ISD::FP_TO_UINT , MVT::i16 , Promote);
233 if (Subtarget->is64Bit()) {
234 if (!Subtarget->useSoftFloat() && Subtarget->hasAVX512()) {
235 // FP_TO_UINT-i32/i64 is legal for f32/f64, but custom for f80.
236 setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Custom);
237 setOperationAction(ISD::FP_TO_UINT , MVT::i64 , Custom);
239 setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Promote);
240 setOperationAction(ISD::FP_TO_UINT , MVT::i64 , Expand);
242 } else if (!Subtarget->useSoftFloat()) {
243 // Since AVX is a superset of SSE3, only check for SSE here.
244 if (Subtarget->hasSSE1() && !Subtarget->hasSSE3())
245 // Expand FP_TO_UINT into a select.
246 // FIXME: We would like to use a Custom expander here eventually to do
247 // the optimal thing for SSE vs. the default expansion in the legalizer.
248 setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Expand);
250 // With AVX512 we can use vcvts[ds]2usi for f32/f64->i32, f80 is custom.
251 // With SSE3 we can use fisttpll to convert to a signed i64; without
252 // SSE, we're stuck with a fistpll.
253 setOperationAction(ISD::FP_TO_UINT , MVT::i32 , Custom);
255 setOperationAction(ISD::FP_TO_UINT , MVT::i64 , Custom);
258 // TODO: when we have SSE, these could be more efficient, by using movd/movq.
259 if (!X86ScalarSSEf64) {
260 setOperationAction(ISD::BITCAST , MVT::f32 , Expand);
261 setOperationAction(ISD::BITCAST , MVT::i32 , Expand);
262 if (Subtarget->is64Bit()) {
263 setOperationAction(ISD::BITCAST , MVT::f64 , Expand);
264 // Without SSE, i64->f64 goes through memory.
265 setOperationAction(ISD::BITCAST , MVT::i64 , Expand);
269 // Scalar integer divide and remainder are lowered to use operations that
270 // produce two results, to match the available instructions. This exposes
271 // the two-result form to trivial CSE, which is able to combine x/y and x%y
272 // into a single instruction.
274 // Scalar integer multiply-high is also lowered to use two-result
275 // operations, to match the available instructions. However, plain multiply
276 // (low) operations are left as Legal, as there are single-result
277 // instructions for this in x86. Using the two-result multiply instructions
278 // when both high and low results are needed must be arranged by dagcombine.
279 for (auto VT : { MVT::i8, MVT::i16, MVT::i32, MVT::i64 }) {
280 setOperationAction(ISD::MULHS, VT, Expand);
281 setOperationAction(ISD::MULHU, VT, Expand);
282 setOperationAction(ISD::SDIV, VT, Expand);
283 setOperationAction(ISD::UDIV, VT, Expand);
284 setOperationAction(ISD::SREM, VT, Expand);
285 setOperationAction(ISD::UREM, VT, Expand);
287 // Add/Sub overflow ops with MVT::Glues are lowered to EFLAGS dependences.
288 setOperationAction(ISD::ADDC, VT, Custom);
289 setOperationAction(ISD::ADDE, VT, Custom);
290 setOperationAction(ISD::SUBC, VT, Custom);
291 setOperationAction(ISD::SUBE, VT, Custom);
294 setOperationAction(ISD::BR_JT , MVT::Other, Expand);
295 setOperationAction(ISD::BRCOND , MVT::Other, Custom);
296 setOperationAction(ISD::BR_CC , MVT::f32, Expand);
297 setOperationAction(ISD::BR_CC , MVT::f64, Expand);
298 setOperationAction(ISD::BR_CC , MVT::f80, Expand);
299 setOperationAction(ISD::BR_CC , MVT::i8, Expand);
300 setOperationAction(ISD::BR_CC , MVT::i16, Expand);
301 setOperationAction(ISD::BR_CC , MVT::i32, Expand);
302 setOperationAction(ISD::BR_CC , MVT::i64, Expand);
303 setOperationAction(ISD::SELECT_CC , MVT::f32, Expand);
304 setOperationAction(ISD::SELECT_CC , MVT::f64, Expand);
305 setOperationAction(ISD::SELECT_CC , MVT::f80, Expand);
306 setOperationAction(ISD::SELECT_CC , MVT::i8, Expand);
307 setOperationAction(ISD::SELECT_CC , MVT::i16, Expand);
308 setOperationAction(ISD::SELECT_CC , MVT::i32, Expand);
309 setOperationAction(ISD::SELECT_CC , MVT::i64, Expand);
310 if (Subtarget->is64Bit())
311 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i32, Legal);
312 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16 , Legal);
313 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Legal);
314 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
315 setOperationAction(ISD::FP_ROUND_INREG , MVT::f32 , Expand);
317 if (Subtarget->is32Bit() && Subtarget->isTargetKnownWindowsMSVC()) {
318 // On 32 bit MSVC, `fmodf(f32)` is not defined - only `fmod(f64)`
319 // is. We should promote the value to 64-bits to solve this.
320 // This is what the CRT headers do - `fmodf` is an inline header
321 // function casting to f64 and calling `fmod`.
322 setOperationAction(ISD::FREM , MVT::f32 , Promote);
324 setOperationAction(ISD::FREM , MVT::f32 , Expand);
327 setOperationAction(ISD::FREM , MVT::f64 , Expand);
328 setOperationAction(ISD::FREM , MVT::f80 , Expand);
329 setOperationAction(ISD::FLT_ROUNDS_ , MVT::i32 , Custom);
331 // Promote the i8 variants and force them on up to i32 which has a shorter
333 setOperationAction(ISD::CTTZ , MVT::i8 , Promote);
334 AddPromotedToType (ISD::CTTZ , MVT::i8 , MVT::i32);
335 setOperationAction(ISD::CTTZ_ZERO_UNDEF , MVT::i8 , Promote);
336 AddPromotedToType (ISD::CTTZ_ZERO_UNDEF , MVT::i8 , MVT::i32);
337 if (Subtarget->hasBMI()) {
338 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i16 , Expand);
339 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32 , Expand);
340 if (Subtarget->is64Bit())
341 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i64, Expand);
343 setOperationAction(ISD::CTTZ , MVT::i16 , Custom);
344 setOperationAction(ISD::CTTZ , MVT::i32 , Custom);
345 if (Subtarget->is64Bit())
346 setOperationAction(ISD::CTTZ , MVT::i64 , Custom);
349 if (Subtarget->hasLZCNT()) {
350 // When promoting the i8 variants, force them to i32 for a shorter
352 setOperationAction(ISD::CTLZ , MVT::i8 , Promote);
353 AddPromotedToType (ISD::CTLZ , MVT::i8 , MVT::i32);
354 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i8 , Promote);
355 AddPromotedToType (ISD::CTLZ_ZERO_UNDEF, MVT::i8 , MVT::i32);
356 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16 , Expand);
357 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32 , Expand);
358 if (Subtarget->is64Bit())
359 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand);
361 setOperationAction(ISD::CTLZ , MVT::i8 , Custom);
362 setOperationAction(ISD::CTLZ , MVT::i16 , Custom);
363 setOperationAction(ISD::CTLZ , MVT::i32 , Custom);
364 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i8 , Custom);
365 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16 , Custom);
366 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32 , Custom);
367 if (Subtarget->is64Bit()) {
368 setOperationAction(ISD::CTLZ , MVT::i64 , Custom);
369 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Custom);
373 // Special handling for half-precision floating point conversions.
374 // If we don't have F16C support, then lower half float conversions
375 // into library calls.
376 if (Subtarget->useSoftFloat() || !Subtarget->hasF16C()) {
377 setOperationAction(ISD::FP16_TO_FP, MVT::f32, Expand);
378 setOperationAction(ISD::FP_TO_FP16, MVT::f32, Expand);
381 // There's never any support for operations beyond MVT::f32.
382 setOperationAction(ISD::FP16_TO_FP, MVT::f64, Expand);
383 setOperationAction(ISD::FP16_TO_FP, MVT::f80, Expand);
384 setOperationAction(ISD::FP_TO_FP16, MVT::f64, Expand);
385 setOperationAction(ISD::FP_TO_FP16, MVT::f80, Expand);
387 setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f16, Expand);
388 setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f16, Expand);
389 setLoadExtAction(ISD::EXTLOAD, MVT::f80, MVT::f16, Expand);
390 setTruncStoreAction(MVT::f32, MVT::f16, Expand);
391 setTruncStoreAction(MVT::f64, MVT::f16, Expand);
392 setTruncStoreAction(MVT::f80, MVT::f16, Expand);
394 if (Subtarget->hasPOPCNT()) {
395 setOperationAction(ISD::CTPOP , MVT::i8 , Promote);
397 setOperationAction(ISD::CTPOP , MVT::i8 , Expand);
398 setOperationAction(ISD::CTPOP , MVT::i16 , Expand);
399 setOperationAction(ISD::CTPOP , MVT::i32 , Expand);
400 if (Subtarget->is64Bit())
401 setOperationAction(ISD::CTPOP , MVT::i64 , Expand);
404 setOperationAction(ISD::READCYCLECOUNTER , MVT::i64 , Custom);
406 if (!Subtarget->hasMOVBE())
407 setOperationAction(ISD::BSWAP , MVT::i16 , Expand);
409 // These should be promoted to a larger select which is supported.
410 setOperationAction(ISD::SELECT , MVT::i1 , Promote);
411 // X86 wants to expand cmov itself.
412 setOperationAction(ISD::SELECT , MVT::i8 , Custom);
413 setOperationAction(ISD::SELECT , MVT::i16 , Custom);
414 setOperationAction(ISD::SELECT , MVT::i32 , Custom);
415 setOperationAction(ISD::SELECT , MVT::f32 , Custom);
416 setOperationAction(ISD::SELECT , MVT::f64 , Custom);
417 setOperationAction(ISD::SELECT , MVT::f80 , Custom);
418 setOperationAction(ISD::SETCC , MVT::i8 , Custom);
419 setOperationAction(ISD::SETCC , MVT::i16 , Custom);
420 setOperationAction(ISD::SETCC , MVT::i32 , Custom);
421 setOperationAction(ISD::SETCC , MVT::f32 , Custom);
422 setOperationAction(ISD::SETCC , MVT::f64 , Custom);
423 setOperationAction(ISD::SETCC , MVT::f80 , Custom);
424 setOperationAction(ISD::SETCCE , MVT::i8 , Custom);
425 setOperationAction(ISD::SETCCE , MVT::i16 , Custom);
426 setOperationAction(ISD::SETCCE , MVT::i32 , Custom);
427 if (Subtarget->is64Bit()) {
428 setOperationAction(ISD::SELECT , MVT::i64 , Custom);
429 setOperationAction(ISD::SETCC , MVT::i64 , Custom);
430 setOperationAction(ISD::SETCCE , MVT::i64 , Custom);
432 setOperationAction(ISD::EH_RETURN , MVT::Other, Custom);
433 // NOTE: EH_SJLJ_SETJMP/_LONGJMP supported here is NOT intended to support
434 // SjLj exception handling but a light-weight setjmp/longjmp replacement to
435 // support continuation, user-level threading, and etc.. As a result, no
436 // other SjLj exception interfaces are implemented and please don't build
437 // your own exception handling based on them.
438 // LLVM/Clang supports zero-cost DWARF exception handling.
439 setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom);
440 setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom);
443 setOperationAction(ISD::ConstantPool , MVT::i32 , Custom);
444 setOperationAction(ISD::JumpTable , MVT::i32 , Custom);
445 setOperationAction(ISD::GlobalAddress , MVT::i32 , Custom);
446 setOperationAction(ISD::GlobalTLSAddress, MVT::i32 , Custom);
447 if (Subtarget->is64Bit())
448 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
449 setOperationAction(ISD::ExternalSymbol , MVT::i32 , Custom);
450 setOperationAction(ISD::BlockAddress , MVT::i32 , Custom);
451 if (Subtarget->is64Bit()) {
452 setOperationAction(ISD::ConstantPool , MVT::i64 , Custom);
453 setOperationAction(ISD::JumpTable , MVT::i64 , Custom);
454 setOperationAction(ISD::GlobalAddress , MVT::i64 , Custom);
455 setOperationAction(ISD::ExternalSymbol, MVT::i64 , Custom);
456 setOperationAction(ISD::BlockAddress , MVT::i64 , Custom);
458 // 64-bit addm sub, shl, sra, srl (iff 32-bit x86)
459 setOperationAction(ISD::SHL_PARTS , MVT::i32 , Custom);
460 setOperationAction(ISD::SRA_PARTS , MVT::i32 , Custom);
461 setOperationAction(ISD::SRL_PARTS , MVT::i32 , Custom);
462 if (Subtarget->is64Bit()) {
463 setOperationAction(ISD::SHL_PARTS , MVT::i64 , Custom);
464 setOperationAction(ISD::SRA_PARTS , MVT::i64 , Custom);
465 setOperationAction(ISD::SRL_PARTS , MVT::i64 , Custom);
468 if (Subtarget->hasSSE1())
469 setOperationAction(ISD::PREFETCH , MVT::Other, Legal);
471 setOperationAction(ISD::ATOMIC_FENCE , MVT::Other, Custom);
473 // Expand certain atomics
474 for (auto VT : { MVT::i8, MVT::i16, MVT::i32, MVT::i64 }) {
475 setOperationAction(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, VT, Custom);
476 setOperationAction(ISD::ATOMIC_LOAD_SUB, VT, Custom);
477 setOperationAction(ISD::ATOMIC_STORE, VT, Custom);
480 if (Subtarget->hasCmpxchg16b()) {
481 setOperationAction(ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS, MVT::i128, Custom);
484 // FIXME - use subtarget debug flags
485 if (!Subtarget->isTargetDarwin() && !Subtarget->isTargetELF() &&
486 !Subtarget->isTargetCygMing() && !Subtarget->isTargetWin64()) {
487 setOperationAction(ISD::EH_LABEL, MVT::Other, Expand);
490 setOperationAction(ISD::FRAME_TO_ARGS_OFFSET, MVT::i32, Custom);
491 setOperationAction(ISD::FRAME_TO_ARGS_OFFSET, MVT::i64, Custom);
493 setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
494 setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
496 setOperationAction(ISD::TRAP, MVT::Other, Legal);
497 setOperationAction(ISD::DEBUGTRAP, MVT::Other, Legal);
499 // VASTART needs to be custom lowered to use the VarArgsFrameIndex
500 setOperationAction(ISD::VASTART , MVT::Other, Custom);
501 setOperationAction(ISD::VAEND , MVT::Other, Expand);
502 if (Subtarget->is64Bit()) {
503 setOperationAction(ISD::VAARG , MVT::Other, Custom);
504 setOperationAction(ISD::VACOPY , MVT::Other, Custom);
506 // TargetInfo::CharPtrBuiltinVaList
507 setOperationAction(ISD::VAARG , MVT::Other, Expand);
508 setOperationAction(ISD::VACOPY , MVT::Other, Expand);
511 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
512 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
514 setOperationAction(ISD::DYNAMIC_STACKALLOC, PtrVT, Custom);
516 // GC_TRANSITION_START and GC_TRANSITION_END need custom lowering.
517 setOperationAction(ISD::GC_TRANSITION_START, MVT::Other, Custom);
518 setOperationAction(ISD::GC_TRANSITION_END, MVT::Other, Custom);
520 if (!Subtarget->useSoftFloat() && X86ScalarSSEf64) {
521 // f32 and f64 use SSE.
522 // Set up the FP register classes.
523 addRegisterClass(MVT::f32, &X86::FR32RegClass);
524 addRegisterClass(MVT::f64, &X86::FR64RegClass);
526 // Use ANDPD to simulate FABS.
527 setOperationAction(ISD::FABS , MVT::f64, Custom);
528 setOperationAction(ISD::FABS , MVT::f32, Custom);
530 // Use XORP to simulate FNEG.
531 setOperationAction(ISD::FNEG , MVT::f64, Custom);
532 setOperationAction(ISD::FNEG , MVT::f32, Custom);
534 // Use ANDPD and ORPD to simulate FCOPYSIGN.
535 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
536 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
538 // Lower this to FGETSIGNx86 plus an AND.
539 setOperationAction(ISD::FGETSIGN, MVT::i64, Custom);
540 setOperationAction(ISD::FGETSIGN, MVT::i32, Custom);
542 // We don't support sin/cos/fmod
543 setOperationAction(ISD::FSIN , MVT::f64, Expand);
544 setOperationAction(ISD::FCOS , MVT::f64, Expand);
545 setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
546 setOperationAction(ISD::FSIN , MVT::f32, Expand);
547 setOperationAction(ISD::FCOS , MVT::f32, Expand);
548 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
550 // Expand FP immediates into loads from the stack, except for the special
552 addLegalFPImmediate(APFloat(+0.0)); // xorpd
553 addLegalFPImmediate(APFloat(+0.0f)); // xorps
554 } else if (!Subtarget->useSoftFloat() && X86ScalarSSEf32) {
555 // Use SSE for f32, x87 for f64.
556 // Set up the FP register classes.
557 addRegisterClass(MVT::f32, &X86::FR32RegClass);
558 addRegisterClass(MVT::f64, &X86::RFP64RegClass);
560 // Use ANDPS to simulate FABS.
561 setOperationAction(ISD::FABS , MVT::f32, Custom);
563 // Use XORP to simulate FNEG.
564 setOperationAction(ISD::FNEG , MVT::f32, Custom);
566 setOperationAction(ISD::UNDEF, MVT::f64, Expand);
568 // Use ANDPS and ORPS to simulate FCOPYSIGN.
569 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
570 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
572 // We don't support sin/cos/fmod
573 setOperationAction(ISD::FSIN , MVT::f32, Expand);
574 setOperationAction(ISD::FCOS , MVT::f32, Expand);
575 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
577 // Special cases we handle for FP constants.
578 addLegalFPImmediate(APFloat(+0.0f)); // xorps
579 addLegalFPImmediate(APFloat(+0.0)); // FLD0
580 addLegalFPImmediate(APFloat(+1.0)); // FLD1
581 addLegalFPImmediate(APFloat(-0.0)); // FLD0/FCHS
582 addLegalFPImmediate(APFloat(-1.0)); // FLD1/FCHS
584 if (!TM.Options.UnsafeFPMath) {
585 setOperationAction(ISD::FSIN , MVT::f64, Expand);
586 setOperationAction(ISD::FCOS , MVT::f64, Expand);
587 setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
589 } else if (!Subtarget->useSoftFloat()) {
590 // f32 and f64 in x87.
591 // Set up the FP register classes.
592 addRegisterClass(MVT::f64, &X86::RFP64RegClass);
593 addRegisterClass(MVT::f32, &X86::RFP32RegClass);
595 setOperationAction(ISD::UNDEF, MVT::f64, Expand);
596 setOperationAction(ISD::UNDEF, MVT::f32, Expand);
597 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
598 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
600 if (!TM.Options.UnsafeFPMath) {
601 setOperationAction(ISD::FSIN , MVT::f64, Expand);
602 setOperationAction(ISD::FSIN , MVT::f32, Expand);
603 setOperationAction(ISD::FCOS , MVT::f64, Expand);
604 setOperationAction(ISD::FCOS , MVT::f32, Expand);
605 setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
606 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
608 addLegalFPImmediate(APFloat(+0.0)); // FLD0
609 addLegalFPImmediate(APFloat(+1.0)); // FLD1
610 addLegalFPImmediate(APFloat(-0.0)); // FLD0/FCHS
611 addLegalFPImmediate(APFloat(-1.0)); // FLD1/FCHS
612 addLegalFPImmediate(APFloat(+0.0f)); // FLD0
613 addLegalFPImmediate(APFloat(+1.0f)); // FLD1
614 addLegalFPImmediate(APFloat(-0.0f)); // FLD0/FCHS
615 addLegalFPImmediate(APFloat(-1.0f)); // FLD1/FCHS
618 // We don't support FMA.
619 setOperationAction(ISD::FMA, MVT::f64, Expand);
620 setOperationAction(ISD::FMA, MVT::f32, Expand);
622 // Long double always uses X87.
623 if (!Subtarget->useSoftFloat()) {
624 addRegisterClass(MVT::f80, &X86::RFP80RegClass);
625 setOperationAction(ISD::UNDEF, MVT::f80, Expand);
626 setOperationAction(ISD::FCOPYSIGN, MVT::f80, Expand);
628 APFloat TmpFlt = APFloat::getZero(APFloat::x87DoubleExtended);
629 addLegalFPImmediate(TmpFlt); // FLD0
631 addLegalFPImmediate(TmpFlt); // FLD0/FCHS
634 APFloat TmpFlt2(+1.0);
635 TmpFlt2.convert(APFloat::x87DoubleExtended, APFloat::rmNearestTiesToEven,
637 addLegalFPImmediate(TmpFlt2); // FLD1
638 TmpFlt2.changeSign();
639 addLegalFPImmediate(TmpFlt2); // FLD1/FCHS
642 if (!TM.Options.UnsafeFPMath) {
643 setOperationAction(ISD::FSIN , MVT::f80, Expand);
644 setOperationAction(ISD::FCOS , MVT::f80, Expand);
645 setOperationAction(ISD::FSINCOS, MVT::f80, Expand);
648 setOperationAction(ISD::FFLOOR, MVT::f80, Expand);
649 setOperationAction(ISD::FCEIL, MVT::f80, Expand);
650 setOperationAction(ISD::FTRUNC, MVT::f80, Expand);
651 setOperationAction(ISD::FRINT, MVT::f80, Expand);
652 setOperationAction(ISD::FNEARBYINT, MVT::f80, Expand);
653 setOperationAction(ISD::FMA, MVT::f80, Expand);
656 // Always use a library call for pow.
657 setOperationAction(ISD::FPOW , MVT::f32 , Expand);
658 setOperationAction(ISD::FPOW , MVT::f64 , Expand);
659 setOperationAction(ISD::FPOW , MVT::f80 , Expand);
661 setOperationAction(ISD::FLOG, MVT::f80, Expand);
662 setOperationAction(ISD::FLOG2, MVT::f80, Expand);
663 setOperationAction(ISD::FLOG10, MVT::f80, Expand);
664 setOperationAction(ISD::FEXP, MVT::f80, Expand);
665 setOperationAction(ISD::FEXP2, MVT::f80, Expand);
666 setOperationAction(ISD::FMINNUM, MVT::f80, Expand);
667 setOperationAction(ISD::FMAXNUM, MVT::f80, Expand);
669 // First set operation action for all vector types to either promote
670 // (for widening) or expand (for scalarization). Then we will selectively
671 // turn on ones that can be effectively codegen'd.
672 for (MVT VT : MVT::vector_valuetypes()) {
673 setOperationAction(ISD::ADD , VT, Expand);
674 setOperationAction(ISD::SUB , VT, Expand);
675 setOperationAction(ISD::FADD, VT, Expand);
676 setOperationAction(ISD::FNEG, VT, Expand);
677 setOperationAction(ISD::FSUB, VT, Expand);
678 setOperationAction(ISD::MUL , VT, Expand);
679 setOperationAction(ISD::FMUL, VT, Expand);
680 setOperationAction(ISD::SDIV, VT, Expand);
681 setOperationAction(ISD::UDIV, VT, Expand);
682 setOperationAction(ISD::FDIV, VT, Expand);
683 setOperationAction(ISD::SREM, VT, Expand);
684 setOperationAction(ISD::UREM, VT, Expand);
685 setOperationAction(ISD::LOAD, VT, Expand);
686 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Expand);
687 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT,Expand);
688 setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Expand);
689 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT,Expand);
690 setOperationAction(ISD::INSERT_SUBVECTOR, VT,Expand);
691 setOperationAction(ISD::FABS, VT, Expand);
692 setOperationAction(ISD::FSIN, VT, Expand);
693 setOperationAction(ISD::FSINCOS, VT, Expand);
694 setOperationAction(ISD::FCOS, VT, Expand);
695 setOperationAction(ISD::FSINCOS, VT, Expand);
696 setOperationAction(ISD::FREM, VT, Expand);
697 setOperationAction(ISD::FMA, VT, Expand);
698 setOperationAction(ISD::FPOWI, VT, Expand);
699 setOperationAction(ISD::FSQRT, VT, Expand);
700 setOperationAction(ISD::FCOPYSIGN, VT, Expand);
701 setOperationAction(ISD::FFLOOR, VT, Expand);
702 setOperationAction(ISD::FCEIL, VT, Expand);
703 setOperationAction(ISD::FTRUNC, VT, Expand);
704 setOperationAction(ISD::FRINT, VT, Expand);
705 setOperationAction(ISD::FNEARBYINT, VT, Expand);
706 setOperationAction(ISD::SMUL_LOHI, VT, Expand);
707 setOperationAction(ISD::MULHS, VT, Expand);
708 setOperationAction(ISD::UMUL_LOHI, VT, Expand);
709 setOperationAction(ISD::MULHU, VT, Expand);
710 setOperationAction(ISD::SDIVREM, VT, Expand);
711 setOperationAction(ISD::UDIVREM, VT, Expand);
712 setOperationAction(ISD::FPOW, VT, Expand);
713 setOperationAction(ISD::CTPOP, VT, Expand);
714 setOperationAction(ISD::CTTZ, VT, Expand);
715 setOperationAction(ISD::CTTZ_ZERO_UNDEF, VT, Expand);
716 setOperationAction(ISD::CTLZ, VT, Expand);
717 setOperationAction(ISD::CTLZ_ZERO_UNDEF, VT, Expand);
718 setOperationAction(ISD::SHL, VT, Expand);
719 setOperationAction(ISD::SRA, VT, Expand);
720 setOperationAction(ISD::SRL, VT, Expand);
721 setOperationAction(ISD::ROTL, VT, Expand);
722 setOperationAction(ISD::ROTR, VT, Expand);
723 setOperationAction(ISD::BSWAP, VT, Expand);
724 setOperationAction(ISD::SETCC, VT, Expand);
725 setOperationAction(ISD::FLOG, VT, Expand);
726 setOperationAction(ISD::FLOG2, VT, Expand);
727 setOperationAction(ISD::FLOG10, VT, Expand);
728 setOperationAction(ISD::FEXP, VT, Expand);
729 setOperationAction(ISD::FEXP2, VT, Expand);
730 setOperationAction(ISD::FP_TO_UINT, VT, Expand);
731 setOperationAction(ISD::FP_TO_SINT, VT, Expand);
732 setOperationAction(ISD::UINT_TO_FP, VT, Expand);
733 setOperationAction(ISD::SINT_TO_FP, VT, Expand);
734 setOperationAction(ISD::SIGN_EXTEND_INREG, VT,Expand);
735 setOperationAction(ISD::TRUNCATE, VT, Expand);
736 setOperationAction(ISD::SIGN_EXTEND, VT, Expand);
737 setOperationAction(ISD::ZERO_EXTEND, VT, Expand);
738 setOperationAction(ISD::ANY_EXTEND, VT, Expand);
739 setOperationAction(ISD::VSELECT, VT, Expand);
740 setOperationAction(ISD::SELECT_CC, VT, Expand);
741 for (MVT InnerVT : MVT::vector_valuetypes()) {
742 setTruncStoreAction(InnerVT, VT, Expand);
744 setLoadExtAction(ISD::SEXTLOAD, InnerVT, VT, Expand);
745 setLoadExtAction(ISD::ZEXTLOAD, InnerVT, VT, Expand);
747 // N.b. ISD::EXTLOAD legality is basically ignored except for i1-like
748 // types, we have to deal with them whether we ask for Expansion or not.
749 // Setting Expand causes its own optimisation problems though, so leave
751 if (VT.getVectorElementType() == MVT::i1)
752 setLoadExtAction(ISD::EXTLOAD, InnerVT, VT, Expand);
754 // EXTLOAD for MVT::f16 vectors is not legal because f16 vectors are
755 // split/scalarized right now.
756 if (VT.getVectorElementType() == MVT::f16)
757 setLoadExtAction(ISD::EXTLOAD, InnerVT, VT, Expand);
761 // FIXME: In order to prevent SSE instructions being expanded to MMX ones
762 // with -msoft-float, disable use of MMX as well.
763 if (!Subtarget->useSoftFloat() && Subtarget->hasMMX()) {
764 addRegisterClass(MVT::x86mmx, &X86::VR64RegClass);
765 // No operations on x86mmx supported, everything uses intrinsics.
768 // MMX-sized vectors (other than x86mmx) are expected to be expanded
769 // into smaller operations.
770 for (MVT MMXTy : {MVT::v8i8, MVT::v4i16, MVT::v2i32, MVT::v1i64}) {
771 setOperationAction(ISD::MULHS, MMXTy, Expand);
772 setOperationAction(ISD::AND, MMXTy, Expand);
773 setOperationAction(ISD::OR, MMXTy, Expand);
774 setOperationAction(ISD::XOR, MMXTy, Expand);
775 setOperationAction(ISD::SCALAR_TO_VECTOR, MMXTy, Expand);
776 setOperationAction(ISD::SELECT, MMXTy, Expand);
777 setOperationAction(ISD::BITCAST, MMXTy, Expand);
779 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v1i64, Expand);
781 if (!Subtarget->useSoftFloat() && Subtarget->hasSSE1()) {
782 addRegisterClass(MVT::v4f32, &X86::VR128RegClass);
784 setOperationAction(ISD::FADD, MVT::v4f32, Legal);
785 setOperationAction(ISD::FSUB, MVT::v4f32, Legal);
786 setOperationAction(ISD::FMUL, MVT::v4f32, Legal);
787 setOperationAction(ISD::FDIV, MVT::v4f32, Legal);
788 setOperationAction(ISD::FSQRT, MVT::v4f32, Legal);
789 setOperationAction(ISD::FNEG, MVT::v4f32, Custom);
790 setOperationAction(ISD::FABS, MVT::v4f32, Custom);
791 setOperationAction(ISD::LOAD, MVT::v4f32, Legal);
792 setOperationAction(ISD::BUILD_VECTOR, MVT::v4f32, Custom);
793 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v4f32, Custom);
794 setOperationAction(ISD::VSELECT, MVT::v4f32, Custom);
795 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Custom);
796 setOperationAction(ISD::SELECT, MVT::v4f32, Custom);
797 setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Custom);
800 if (!Subtarget->useSoftFloat() && Subtarget->hasSSE2()) {
801 addRegisterClass(MVT::v2f64, &X86::VR128RegClass);
803 // FIXME: Unfortunately, -soft-float and -no-implicit-float mean XMM
804 // registers cannot be used even for integer operations.
805 addRegisterClass(MVT::v16i8, &X86::VR128RegClass);
806 addRegisterClass(MVT::v8i16, &X86::VR128RegClass);
807 addRegisterClass(MVT::v4i32, &X86::VR128RegClass);
808 addRegisterClass(MVT::v2i64, &X86::VR128RegClass);
810 setOperationAction(ISD::ADD, MVT::v16i8, Legal);
811 setOperationAction(ISD::ADD, MVT::v8i16, Legal);
812 setOperationAction(ISD::ADD, MVT::v4i32, Legal);
813 setOperationAction(ISD::ADD, MVT::v2i64, Legal);
814 setOperationAction(ISD::MUL, MVT::v16i8, Custom);
815 setOperationAction(ISD::MUL, MVT::v4i32, Custom);
816 setOperationAction(ISD::MUL, MVT::v2i64, Custom);
817 setOperationAction(ISD::UMUL_LOHI, MVT::v4i32, Custom);
818 setOperationAction(ISD::SMUL_LOHI, MVT::v4i32, Custom);
819 setOperationAction(ISD::MULHU, MVT::v8i16, Legal);
820 setOperationAction(ISD::MULHS, MVT::v8i16, Legal);
821 setOperationAction(ISD::SUB, MVT::v16i8, Legal);
822 setOperationAction(ISD::SUB, MVT::v8i16, Legal);
823 setOperationAction(ISD::SUB, MVT::v4i32, Legal);
824 setOperationAction(ISD::SUB, MVT::v2i64, Legal);
825 setOperationAction(ISD::MUL, MVT::v8i16, Legal);
826 setOperationAction(ISD::FADD, MVT::v2f64, Legal);
827 setOperationAction(ISD::FSUB, MVT::v2f64, Legal);
828 setOperationAction(ISD::FMUL, MVT::v2f64, Legal);
829 setOperationAction(ISD::FDIV, MVT::v2f64, Legal);
830 setOperationAction(ISD::FSQRT, MVT::v2f64, Legal);
831 setOperationAction(ISD::FNEG, MVT::v2f64, Custom);
832 setOperationAction(ISD::FABS, MVT::v2f64, Custom);
834 setOperationAction(ISD::SMAX, MVT::v8i16, Legal);
835 setOperationAction(ISD::UMAX, MVT::v16i8, Legal);
836 setOperationAction(ISD::SMIN, MVT::v8i16, Legal);
837 setOperationAction(ISD::UMIN, MVT::v16i8, Legal);
839 setOperationAction(ISD::SETCC, MVT::v2i64, Custom);
840 setOperationAction(ISD::SETCC, MVT::v16i8, Custom);
841 setOperationAction(ISD::SETCC, MVT::v8i16, Custom);
842 setOperationAction(ISD::SETCC, MVT::v4i32, Custom);
844 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v16i8, Custom);
845 setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i16, Custom);
846 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Custom);
847 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
848 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
850 setOperationAction(ISD::CTPOP, MVT::v16i8, Custom);
851 setOperationAction(ISD::CTPOP, MVT::v8i16, Custom);
852 setOperationAction(ISD::CTPOP, MVT::v4i32, Custom);
853 setOperationAction(ISD::CTPOP, MVT::v2i64, Custom);
855 setOperationAction(ISD::CTTZ, MVT::v16i8, Custom);
856 setOperationAction(ISD::CTTZ, MVT::v8i16, Custom);
857 setOperationAction(ISD::CTTZ, MVT::v4i32, Custom);
858 // ISD::CTTZ v2i64 - scalarization is faster.
859 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v16i8, Custom);
860 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v8i16, Custom);
861 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v4i32, Custom);
862 // ISD::CTTZ_ZERO_UNDEF v2i64 - scalarization is faster.
864 // Custom lower build_vector, vector_shuffle, and extract_vector_elt.
865 for (auto VT : { MVT::v16i8, MVT::v8i16, MVT::v4i32 }) {
866 setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
867 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Custom);
868 setOperationAction(ISD::VSELECT, VT, Custom);
869 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Custom);
872 // We support custom legalizing of sext and anyext loads for specific
873 // memory vector types which we can load as a scalar (or sequence of
874 // scalars) and extend in-register to a legal 128-bit vector type. For sext
875 // loads these must work with a single scalar load.
876 for (MVT VT : MVT::integer_vector_valuetypes()) {
877 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v4i8, Custom);
878 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v4i16, Custom);
879 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v8i8, Custom);
880 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2i8, Custom);
881 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2i16, Custom);
882 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2i32, Custom);
883 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v4i8, Custom);
884 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v4i16, Custom);
885 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v8i8, Custom);
888 setOperationAction(ISD::BUILD_VECTOR, MVT::v2f64, Custom);
889 setOperationAction(ISD::BUILD_VECTOR, MVT::v2i64, Custom);
890 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2f64, Custom);
891 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2i64, Custom);
892 setOperationAction(ISD::VSELECT, MVT::v2f64, Custom);
893 setOperationAction(ISD::VSELECT, MVT::v2i64, Custom);
894 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2f64, Custom);
895 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2f64, Custom);
897 if (Subtarget->is64Bit()) {
898 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i64, Custom);
899 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i64, Custom);
902 // Promote v16i8, v8i16, v4i32 load, select, and, or, xor to v2i64.
903 for (auto VT : { MVT::v16i8, MVT::v8i16, MVT::v4i32 }) {
904 setOperationAction(ISD::AND, VT, Promote);
905 AddPromotedToType (ISD::AND, VT, MVT::v2i64);
906 setOperationAction(ISD::OR, VT, Promote);
907 AddPromotedToType (ISD::OR, VT, MVT::v2i64);
908 setOperationAction(ISD::XOR, VT, Promote);
909 AddPromotedToType (ISD::XOR, VT, MVT::v2i64);
910 setOperationAction(ISD::LOAD, VT, Promote);
911 AddPromotedToType (ISD::LOAD, VT, MVT::v2i64);
912 setOperationAction(ISD::SELECT, VT, Promote);
913 AddPromotedToType (ISD::SELECT, VT, MVT::v2i64);
916 // Custom lower v2i64 and v2f64 selects.
917 setOperationAction(ISD::LOAD, MVT::v2f64, Legal);
918 setOperationAction(ISD::LOAD, MVT::v2i64, Legal);
919 setOperationAction(ISD::SELECT, MVT::v2f64, Custom);
920 setOperationAction(ISD::SELECT, MVT::v2i64, Custom);
922 setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Legal);
923 setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Legal);
925 setOperationAction(ISD::SINT_TO_FP, MVT::v2i32, Custom);
927 setOperationAction(ISD::UINT_TO_FP, MVT::v4i8, Custom);
928 setOperationAction(ISD::UINT_TO_FP, MVT::v4i16, Custom);
929 // As there is no 64-bit GPR available, we need build a special custom
930 // sequence to convert from v2i32 to v2f32.
931 if (!Subtarget->is64Bit())
932 setOperationAction(ISD::UINT_TO_FP, MVT::v2f32, Custom);
934 setOperationAction(ISD::FP_EXTEND, MVT::v2f32, Custom);
935 setOperationAction(ISD::FP_ROUND, MVT::v2f32, Custom);
937 for (MVT VT : MVT::fp_vector_valuetypes())
938 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2f32, Legal);
940 setOperationAction(ISD::BITCAST, MVT::v2i32, Custom);
941 setOperationAction(ISD::BITCAST, MVT::v4i16, Custom);
942 setOperationAction(ISD::BITCAST, MVT::v8i8, Custom);
945 if (!Subtarget->useSoftFloat() && Subtarget->hasSSE41()) {
946 for (MVT RoundedTy : {MVT::f32, MVT::f64, MVT::v4f32, MVT::v2f64}) {
947 setOperationAction(ISD::FFLOOR, RoundedTy, Legal);
948 setOperationAction(ISD::FCEIL, RoundedTy, Legal);
949 setOperationAction(ISD::FTRUNC, RoundedTy, Legal);
950 setOperationAction(ISD::FRINT, RoundedTy, Legal);
951 setOperationAction(ISD::FNEARBYINT, RoundedTy, Legal);
954 setOperationAction(ISD::SMAX, MVT::v16i8, Legal);
955 setOperationAction(ISD::SMAX, MVT::v4i32, Legal);
956 setOperationAction(ISD::UMAX, MVT::v8i16, Legal);
957 setOperationAction(ISD::UMAX, MVT::v4i32, Legal);
958 setOperationAction(ISD::SMIN, MVT::v16i8, Legal);
959 setOperationAction(ISD::SMIN, MVT::v4i32, Legal);
960 setOperationAction(ISD::UMIN, MVT::v8i16, Legal);
961 setOperationAction(ISD::UMIN, MVT::v4i32, Legal);
963 // FIXME: Do we need to handle scalar-to-vector here?
964 setOperationAction(ISD::MUL, MVT::v4i32, Legal);
966 // We directly match byte blends in the backend as they match the VSELECT
968 setOperationAction(ISD::VSELECT, MVT::v16i8, Legal);
970 // SSE41 brings specific instructions for doing vector sign extend even in
971 // cases where we don't have SRA.
972 for (MVT VT : MVT::integer_vector_valuetypes()) {
973 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v2i8, Custom);
974 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v2i16, Custom);
975 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::v2i32, Custom);
978 // SSE41 also has vector sign/zero extending loads, PMOV[SZ]X
979 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i16, MVT::v8i8, Legal);
980 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i32, MVT::v4i8, Legal);
981 setLoadExtAction(ISD::SEXTLOAD, MVT::v2i64, MVT::v2i8, Legal);
982 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i32, MVT::v4i16, Legal);
983 setLoadExtAction(ISD::SEXTLOAD, MVT::v2i64, MVT::v2i16, Legal);
984 setLoadExtAction(ISD::SEXTLOAD, MVT::v2i64, MVT::v2i32, Legal);
986 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i16, MVT::v8i8, Legal);
987 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i32, MVT::v4i8, Legal);
988 setLoadExtAction(ISD::ZEXTLOAD, MVT::v2i64, MVT::v2i8, Legal);
989 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i32, MVT::v4i16, Legal);
990 setLoadExtAction(ISD::ZEXTLOAD, MVT::v2i64, MVT::v2i16, Legal);
991 setLoadExtAction(ISD::ZEXTLOAD, MVT::v2i64, MVT::v2i32, Legal);
993 // i8 and i16 vectors are custom because the source register and source
994 // source memory operand types are not the same width. f32 vectors are
995 // custom since the immediate controlling the insert encodes additional
997 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v16i8, Custom);
998 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i16, Custom);
999 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4i32, Custom);
1000 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v4f32, Custom);
1002 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v16i8, Custom);
1003 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v8i16, Custom);
1004 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4i32, Custom);
1005 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Custom);
1007 // FIXME: these should be Legal, but that's only for the case where
1008 // the index is constant. For now custom expand to deal with that.
1009 if (Subtarget->is64Bit()) {
1010 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v2i64, Custom);
1011 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v2i64, Custom);
1015 if (Subtarget->hasSSE2()) {
1016 setOperationAction(ISD::SIGN_EXTEND_VECTOR_INREG, MVT::v2i64, Custom);
1017 setOperationAction(ISD::SIGN_EXTEND_VECTOR_INREG, MVT::v4i32, Custom);
1018 setOperationAction(ISD::SIGN_EXTEND_VECTOR_INREG, MVT::v8i16, Custom);
1020 setOperationAction(ISD::SRL, MVT::v8i16, Custom);
1021 setOperationAction(ISD::SRL, MVT::v16i8, Custom);
1023 setOperationAction(ISD::SHL, MVT::v8i16, Custom);
1024 setOperationAction(ISD::SHL, MVT::v16i8, Custom);
1026 setOperationAction(ISD::SRA, MVT::v8i16, Custom);
1027 setOperationAction(ISD::SRA, MVT::v16i8, Custom);
1029 // In the customized shift lowering, the legal cases in AVX2 will be
1031 setOperationAction(ISD::SRL, MVT::v2i64, Custom);
1032 setOperationAction(ISD::SRL, MVT::v4i32, Custom);
1034 setOperationAction(ISD::SHL, MVT::v2i64, Custom);
1035 setOperationAction(ISD::SHL, MVT::v4i32, Custom);
1037 setOperationAction(ISD::SRA, MVT::v2i64, Custom);
1038 setOperationAction(ISD::SRA, MVT::v4i32, Custom);
1041 if (Subtarget->hasXOP()) {
1042 setOperationAction(ISD::ROTL, MVT::v16i8, Custom);
1043 setOperationAction(ISD::ROTL, MVT::v8i16, Custom);
1044 setOperationAction(ISD::ROTL, MVT::v4i32, Custom);
1045 setOperationAction(ISD::ROTL, MVT::v2i64, Custom);
1046 setOperationAction(ISD::ROTL, MVT::v32i8, Custom);
1047 setOperationAction(ISD::ROTL, MVT::v16i16, Custom);
1048 setOperationAction(ISD::ROTL, MVT::v8i32, Custom);
1049 setOperationAction(ISD::ROTL, MVT::v4i64, Custom);
1052 if (!Subtarget->useSoftFloat() && Subtarget->hasFp256()) {
1053 addRegisterClass(MVT::v32i8, &X86::VR256RegClass);
1054 addRegisterClass(MVT::v16i16, &X86::VR256RegClass);
1055 addRegisterClass(MVT::v8i32, &X86::VR256RegClass);
1056 addRegisterClass(MVT::v8f32, &X86::VR256RegClass);
1057 addRegisterClass(MVT::v4i64, &X86::VR256RegClass);
1058 addRegisterClass(MVT::v4f64, &X86::VR256RegClass);
1060 setOperationAction(ISD::LOAD, MVT::v8f32, Legal);
1061 setOperationAction(ISD::LOAD, MVT::v4f64, Legal);
1062 setOperationAction(ISD::LOAD, MVT::v4i64, Legal);
1064 setOperationAction(ISD::FADD, MVT::v8f32, Legal);
1065 setOperationAction(ISD::FSUB, MVT::v8f32, Legal);
1066 setOperationAction(ISD::FMUL, MVT::v8f32, Legal);
1067 setOperationAction(ISD::FDIV, MVT::v8f32, Legal);
1068 setOperationAction(ISD::FSQRT, MVT::v8f32, Legal);
1069 setOperationAction(ISD::FFLOOR, MVT::v8f32, Legal);
1070 setOperationAction(ISD::FCEIL, MVT::v8f32, Legal);
1071 setOperationAction(ISD::FTRUNC, MVT::v8f32, Legal);
1072 setOperationAction(ISD::FRINT, MVT::v8f32, Legal);
1073 setOperationAction(ISD::FNEARBYINT, MVT::v8f32, Legal);
1074 setOperationAction(ISD::FNEG, MVT::v8f32, Custom);
1075 setOperationAction(ISD::FABS, MVT::v8f32, Custom);
1077 setOperationAction(ISD::FADD, MVT::v4f64, Legal);
1078 setOperationAction(ISD::FSUB, MVT::v4f64, Legal);
1079 setOperationAction(ISD::FMUL, MVT::v4f64, Legal);
1080 setOperationAction(ISD::FDIV, MVT::v4f64, Legal);
1081 setOperationAction(ISD::FSQRT, MVT::v4f64, Legal);
1082 setOperationAction(ISD::FFLOOR, MVT::v4f64, Legal);
1083 setOperationAction(ISD::FCEIL, MVT::v4f64, Legal);
1084 setOperationAction(ISD::FTRUNC, MVT::v4f64, Legal);
1085 setOperationAction(ISD::FRINT, MVT::v4f64, Legal);
1086 setOperationAction(ISD::FNEARBYINT, MVT::v4f64, Legal);
1087 setOperationAction(ISD::FNEG, MVT::v4f64, Custom);
1088 setOperationAction(ISD::FABS, MVT::v4f64, Custom);
1090 // (fp_to_int:v8i16 (v8f32 ..)) requires the result type to be promoted
1091 // even though v8i16 is a legal type.
1092 setOperationAction(ISD::FP_TO_SINT, MVT::v8i16, Promote);
1093 setOperationAction(ISD::FP_TO_UINT, MVT::v8i16, Promote);
1094 setOperationAction(ISD::FP_TO_SINT, MVT::v8i32, Legal);
1096 setOperationAction(ISD::SINT_TO_FP, MVT::v8i16, Promote);
1097 setOperationAction(ISD::SINT_TO_FP, MVT::v8i32, Legal);
1098 setOperationAction(ISD::FP_ROUND, MVT::v4f32, Legal);
1100 setOperationAction(ISD::UINT_TO_FP, MVT::v8i8, Custom);
1101 setOperationAction(ISD::UINT_TO_FP, MVT::v8i16, Custom);
1103 for (MVT VT : MVT::fp_vector_valuetypes())
1104 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v4f32, Legal);
1106 setOperationAction(ISD::SRL, MVT::v16i16, Custom);
1107 setOperationAction(ISD::SRL, MVT::v32i8, Custom);
1109 setOperationAction(ISD::SHL, MVT::v16i16, Custom);
1110 setOperationAction(ISD::SHL, MVT::v32i8, Custom);
1112 setOperationAction(ISD::SRA, MVT::v16i16, Custom);
1113 setOperationAction(ISD::SRA, MVT::v32i8, Custom);
1115 setOperationAction(ISD::SETCC, MVT::v32i8, Custom);
1116 setOperationAction(ISD::SETCC, MVT::v16i16, Custom);
1117 setOperationAction(ISD::SETCC, MVT::v8i32, Custom);
1118 setOperationAction(ISD::SETCC, MVT::v4i64, Custom);
1120 setOperationAction(ISD::SELECT, MVT::v4f64, Custom);
1121 setOperationAction(ISD::SELECT, MVT::v4i64, Custom);
1122 setOperationAction(ISD::SELECT, MVT::v8f32, Custom);
1124 setOperationAction(ISD::SIGN_EXTEND, MVT::v4i64, Custom);
1125 setOperationAction(ISD::SIGN_EXTEND, MVT::v8i32, Custom);
1126 setOperationAction(ISD::SIGN_EXTEND, MVT::v16i16, Custom);
1127 setOperationAction(ISD::ZERO_EXTEND, MVT::v4i64, Custom);
1128 setOperationAction(ISD::ZERO_EXTEND, MVT::v8i32, Custom);
1129 setOperationAction(ISD::ZERO_EXTEND, MVT::v16i16, Custom);
1130 setOperationAction(ISD::ANY_EXTEND, MVT::v4i64, Custom);
1131 setOperationAction(ISD::ANY_EXTEND, MVT::v8i32, Custom);
1132 setOperationAction(ISD::ANY_EXTEND, MVT::v16i16, Custom);
1133 setOperationAction(ISD::TRUNCATE, MVT::v16i8, Custom);
1134 setOperationAction(ISD::TRUNCATE, MVT::v8i16, Custom);
1135 setOperationAction(ISD::TRUNCATE, MVT::v4i32, Custom);
1137 setOperationAction(ISD::CTPOP, MVT::v32i8, Custom);
1138 setOperationAction(ISD::CTPOP, MVT::v16i16, Custom);
1139 setOperationAction(ISD::CTPOP, MVT::v8i32, Custom);
1140 setOperationAction(ISD::CTPOP, MVT::v4i64, Custom);
1142 setOperationAction(ISD::CTTZ, MVT::v32i8, Custom);
1143 setOperationAction(ISD::CTTZ, MVT::v16i16, Custom);
1144 setOperationAction(ISD::CTTZ, MVT::v8i32, Custom);
1145 setOperationAction(ISD::CTTZ, MVT::v4i64, Custom);
1146 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v32i8, Custom);
1147 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v16i16, Custom);
1148 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v8i32, Custom);
1149 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v4i64, Custom);
1151 if (Subtarget->hasAnyFMA()) {
1152 setOperationAction(ISD::FMA, MVT::v8f32, Legal);
1153 setOperationAction(ISD::FMA, MVT::v4f64, Legal);
1154 setOperationAction(ISD::FMA, MVT::v4f32, Legal);
1155 setOperationAction(ISD::FMA, MVT::v2f64, Legal);
1156 setOperationAction(ISD::FMA, MVT::f32, Legal);
1157 setOperationAction(ISD::FMA, MVT::f64, Legal);
1160 if (Subtarget->hasInt256()) {
1161 setOperationAction(ISD::ADD, MVT::v4i64, Legal);
1162 setOperationAction(ISD::ADD, MVT::v8i32, Legal);
1163 setOperationAction(ISD::ADD, MVT::v16i16, Legal);
1164 setOperationAction(ISD::ADD, MVT::v32i8, Legal);
1166 setOperationAction(ISD::SUB, MVT::v4i64, Legal);
1167 setOperationAction(ISD::SUB, MVT::v8i32, Legal);
1168 setOperationAction(ISD::SUB, MVT::v16i16, Legal);
1169 setOperationAction(ISD::SUB, MVT::v32i8, Legal);
1171 setOperationAction(ISD::MUL, MVT::v4i64, Custom);
1172 setOperationAction(ISD::MUL, MVT::v8i32, Legal);
1173 setOperationAction(ISD::MUL, MVT::v16i16, Legal);
1174 setOperationAction(ISD::MUL, MVT::v32i8, Custom);
1176 setOperationAction(ISD::UMUL_LOHI, MVT::v8i32, Custom);
1177 setOperationAction(ISD::SMUL_LOHI, MVT::v8i32, Custom);
1178 setOperationAction(ISD::MULHU, MVT::v16i16, Legal);
1179 setOperationAction(ISD::MULHS, MVT::v16i16, Legal);
1181 setOperationAction(ISD::SMAX, MVT::v32i8, Legal);
1182 setOperationAction(ISD::SMAX, MVT::v16i16, Legal);
1183 setOperationAction(ISD::SMAX, MVT::v8i32, Legal);
1184 setOperationAction(ISD::UMAX, MVT::v32i8, Legal);
1185 setOperationAction(ISD::UMAX, MVT::v16i16, Legal);
1186 setOperationAction(ISD::UMAX, MVT::v8i32, Legal);
1187 setOperationAction(ISD::SMIN, MVT::v32i8, Legal);
1188 setOperationAction(ISD::SMIN, MVT::v16i16, Legal);
1189 setOperationAction(ISD::SMIN, MVT::v8i32, Legal);
1190 setOperationAction(ISD::UMIN, MVT::v32i8, Legal);
1191 setOperationAction(ISD::UMIN, MVT::v16i16, Legal);
1192 setOperationAction(ISD::UMIN, MVT::v8i32, Legal);
1194 // The custom lowering for UINT_TO_FP for v8i32 becomes interesting
1195 // when we have a 256bit-wide blend with immediate.
1196 setOperationAction(ISD::UINT_TO_FP, MVT::v8i32, Custom);
1198 // AVX2 also has wider vector sign/zero extending loads, VPMOV[SZ]X
1199 setLoadExtAction(ISD::SEXTLOAD, MVT::v16i16, MVT::v16i8, Legal);
1200 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i32, MVT::v8i8, Legal);
1201 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i64, MVT::v4i8, Legal);
1202 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i32, MVT::v8i16, Legal);
1203 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i64, MVT::v4i16, Legal);
1204 setLoadExtAction(ISD::SEXTLOAD, MVT::v4i64, MVT::v4i32, Legal);
1206 setLoadExtAction(ISD::ZEXTLOAD, MVT::v16i16, MVT::v16i8, Legal);
1207 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i32, MVT::v8i8, Legal);
1208 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i64, MVT::v4i8, Legal);
1209 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i32, MVT::v8i16, Legal);
1210 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i64, MVT::v4i16, Legal);
1211 setLoadExtAction(ISD::ZEXTLOAD, MVT::v4i64, MVT::v4i32, Legal);
1213 setOperationAction(ISD::ADD, MVT::v4i64, Custom);
1214 setOperationAction(ISD::ADD, MVT::v8i32, Custom);
1215 setOperationAction(ISD::ADD, MVT::v16i16, Custom);
1216 setOperationAction(ISD::ADD, MVT::v32i8, Custom);
1218 setOperationAction(ISD::SUB, MVT::v4i64, Custom);
1219 setOperationAction(ISD::SUB, MVT::v8i32, Custom);
1220 setOperationAction(ISD::SUB, MVT::v16i16, Custom);
1221 setOperationAction(ISD::SUB, MVT::v32i8, Custom);
1223 setOperationAction(ISD::MUL, MVT::v4i64, Custom);
1224 setOperationAction(ISD::MUL, MVT::v8i32, Custom);
1225 setOperationAction(ISD::MUL, MVT::v16i16, Custom);
1226 setOperationAction(ISD::MUL, MVT::v32i8, Custom);
1228 setOperationAction(ISD::SMAX, MVT::v32i8, Custom);
1229 setOperationAction(ISD::SMAX, MVT::v16i16, Custom);
1230 setOperationAction(ISD::SMAX, MVT::v8i32, Custom);
1231 setOperationAction(ISD::UMAX, MVT::v32i8, Custom);
1232 setOperationAction(ISD::UMAX, MVT::v16i16, Custom);
1233 setOperationAction(ISD::UMAX, MVT::v8i32, Custom);
1234 setOperationAction(ISD::SMIN, MVT::v32i8, Custom);
1235 setOperationAction(ISD::SMIN, MVT::v16i16, Custom);
1236 setOperationAction(ISD::SMIN, MVT::v8i32, Custom);
1237 setOperationAction(ISD::UMIN, MVT::v32i8, Custom);
1238 setOperationAction(ISD::UMIN, MVT::v16i16, Custom);
1239 setOperationAction(ISD::UMIN, MVT::v8i32, Custom);
1242 // In the customized shift lowering, the legal cases in AVX2 will be
1244 setOperationAction(ISD::SRL, MVT::v4i64, Custom);
1245 setOperationAction(ISD::SRL, MVT::v8i32, Custom);
1247 setOperationAction(ISD::SHL, MVT::v4i64, Custom);
1248 setOperationAction(ISD::SHL, MVT::v8i32, Custom);
1250 setOperationAction(ISD::SRA, MVT::v4i64, Custom);
1251 setOperationAction(ISD::SRA, MVT::v8i32, Custom);
1253 // Custom lower several nodes for 256-bit types.
1254 for (MVT VT : MVT::vector_valuetypes()) {
1255 if (VT.getScalarSizeInBits() >= 32) {
1256 setOperationAction(ISD::MLOAD, VT, Legal);
1257 setOperationAction(ISD::MSTORE, VT, Legal);
1259 // Extract subvector is special because the value type
1260 // (result) is 128-bit but the source is 256-bit wide.
1261 if (VT.is128BitVector()) {
1262 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT, Custom);
1264 // Do not attempt to custom lower other non-256-bit vectors
1265 if (!VT.is256BitVector())
1268 setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
1269 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Custom);
1270 setOperationAction(ISD::VSELECT, VT, Custom);
1271 setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Custom);
1272 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Custom);
1273 setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Custom);
1274 setOperationAction(ISD::INSERT_SUBVECTOR, VT, Custom);
1275 setOperationAction(ISD::CONCAT_VECTORS, VT, Custom);
1278 if (Subtarget->hasInt256())
1279 setOperationAction(ISD::VSELECT, MVT::v32i8, Legal);
1281 // Promote v32i8, v16i16, v8i32 select, and, or, xor to v4i64.
1282 for (auto VT : { MVT::v32i8, MVT::v16i16, MVT::v8i32 }) {
1283 setOperationAction(ISD::AND, VT, Promote);
1284 AddPromotedToType (ISD::AND, VT, MVT::v4i64);
1285 setOperationAction(ISD::OR, VT, Promote);
1286 AddPromotedToType (ISD::OR, VT, MVT::v4i64);
1287 setOperationAction(ISD::XOR, VT, Promote);
1288 AddPromotedToType (ISD::XOR, VT, MVT::v4i64);
1289 setOperationAction(ISD::LOAD, VT, Promote);
1290 AddPromotedToType (ISD::LOAD, VT, MVT::v4i64);
1291 setOperationAction(ISD::SELECT, VT, Promote);
1292 AddPromotedToType (ISD::SELECT, VT, MVT::v4i64);
1296 if (!Subtarget->useSoftFloat() && Subtarget->hasAVX512()) {
1297 addRegisterClass(MVT::v16i32, &X86::VR512RegClass);
1298 addRegisterClass(MVT::v16f32, &X86::VR512RegClass);
1299 addRegisterClass(MVT::v8i64, &X86::VR512RegClass);
1300 addRegisterClass(MVT::v8f64, &X86::VR512RegClass);
1302 addRegisterClass(MVT::i1, &X86::VK1RegClass);
1303 addRegisterClass(MVT::v8i1, &X86::VK8RegClass);
1304 addRegisterClass(MVT::v16i1, &X86::VK16RegClass);
1306 for (MVT VT : MVT::fp_vector_valuetypes())
1307 setLoadExtAction(ISD::EXTLOAD, VT, MVT::v8f32, Legal);
1309 setLoadExtAction(ISD::ZEXTLOAD, MVT::v16i32, MVT::v16i8, Legal);
1310 setLoadExtAction(ISD::SEXTLOAD, MVT::v16i32, MVT::v16i8, Legal);
1311 setLoadExtAction(ISD::ZEXTLOAD, MVT::v16i32, MVT::v16i16, Legal);
1312 setLoadExtAction(ISD::SEXTLOAD, MVT::v16i32, MVT::v16i16, Legal);
1313 setLoadExtAction(ISD::ZEXTLOAD, MVT::v32i16, MVT::v32i8, Legal);
1314 setLoadExtAction(ISD::SEXTLOAD, MVT::v32i16, MVT::v32i8, Legal);
1315 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i64, MVT::v8i8, Legal);
1316 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i64, MVT::v8i8, Legal);
1317 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i64, MVT::v8i16, Legal);
1318 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i64, MVT::v8i16, Legal);
1319 setLoadExtAction(ISD::ZEXTLOAD, MVT::v8i64, MVT::v8i32, Legal);
1320 setLoadExtAction(ISD::SEXTLOAD, MVT::v8i64, MVT::v8i32, Legal);
1322 setOperationAction(ISD::BR_CC, MVT::i1, Expand);
1323 setOperationAction(ISD::SETCC, MVT::i1, Custom);
1324 setOperationAction(ISD::SELECT_CC, MVT::i1, Expand);
1325 setOperationAction(ISD::XOR, MVT::i1, Legal);
1326 setOperationAction(ISD::OR, MVT::i1, Legal);
1327 setOperationAction(ISD::AND, MVT::i1, Legal);
1328 setOperationAction(ISD::SUB, MVT::i1, Custom);
1329 setOperationAction(ISD::ADD, MVT::i1, Custom);
1330 setOperationAction(ISD::MUL, MVT::i1, Custom);
1331 setOperationAction(ISD::LOAD, MVT::v16f32, Legal);
1332 setOperationAction(ISD::LOAD, MVT::v8f64, Legal);
1333 setOperationAction(ISD::LOAD, MVT::v8i64, Legal);
1334 setOperationAction(ISD::LOAD, MVT::v16i32, Legal);
1335 setOperationAction(ISD::LOAD, MVT::v16i1, Legal);
1337 setOperationAction(ISD::FADD, MVT::v16f32, Legal);
1338 setOperationAction(ISD::FSUB, MVT::v16f32, Legal);
1339 setOperationAction(ISD::FMUL, MVT::v16f32, Legal);
1340 setOperationAction(ISD::FDIV, MVT::v16f32, Legal);
1341 setOperationAction(ISD::FSQRT, MVT::v16f32, Legal);
1342 setOperationAction(ISD::FNEG, MVT::v16f32, Custom);
1344 setOperationAction(ISD::FADD, MVT::v8f64, Legal);
1345 setOperationAction(ISD::FSUB, MVT::v8f64, Legal);
1346 setOperationAction(ISD::FMUL, MVT::v8f64, Legal);
1347 setOperationAction(ISD::FDIV, MVT::v8f64, Legal);
1348 setOperationAction(ISD::FSQRT, MVT::v8f64, Legal);
1349 setOperationAction(ISD::FNEG, MVT::v8f64, Custom);
1350 setOperationAction(ISD::FMA, MVT::v8f64, Legal);
1351 setOperationAction(ISD::FMA, MVT::v16f32, Legal);
1353 setOperationAction(ISD::FP_TO_SINT, MVT::v16i32, Legal);
1354 setOperationAction(ISD::FP_TO_UINT, MVT::v16i32, Legal);
1355 setOperationAction(ISD::FP_TO_UINT, MVT::v8i32, Legal);
1356 setOperationAction(ISD::FP_TO_UINT, MVT::v4i32, Legal);
1357 setOperationAction(ISD::SINT_TO_FP, MVT::v16i32, Legal);
1358 setOperationAction(ISD::SINT_TO_FP, MVT::v8i1, Custom);
1359 setOperationAction(ISD::SINT_TO_FP, MVT::v16i1, Custom);
1360 setOperationAction(ISD::SINT_TO_FP, MVT::v16i8, Promote);
1361 setOperationAction(ISD::SINT_TO_FP, MVT::v16i16, Promote);
1362 setOperationAction(ISD::UINT_TO_FP, MVT::v16i32, Legal);
1363 setOperationAction(ISD::UINT_TO_FP, MVT::v8i32, Legal);
1364 setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Legal);
1365 setOperationAction(ISD::UINT_TO_FP, MVT::v16i8, Custom);
1366 setOperationAction(ISD::UINT_TO_FP, MVT::v16i16, Custom);
1367 setOperationAction(ISD::FP_ROUND, MVT::v8f32, Legal);
1368 setOperationAction(ISD::FP_EXTEND, MVT::v8f32, Legal);
1370 setTruncStoreAction(MVT::v8i64, MVT::v8i8, Legal);
1371 setTruncStoreAction(MVT::v8i64, MVT::v8i16, Legal);
1372 setTruncStoreAction(MVT::v8i64, MVT::v8i32, Legal);
1373 setTruncStoreAction(MVT::v16i32, MVT::v16i8, Legal);
1374 setTruncStoreAction(MVT::v16i32, MVT::v16i16, Legal);
1375 if (Subtarget->hasVLX()){
1376 setTruncStoreAction(MVT::v4i64, MVT::v4i8, Legal);
1377 setTruncStoreAction(MVT::v4i64, MVT::v4i16, Legal);
1378 setTruncStoreAction(MVT::v4i64, MVT::v4i32, Legal);
1379 setTruncStoreAction(MVT::v8i32, MVT::v8i8, Legal);
1380 setTruncStoreAction(MVT::v8i32, MVT::v8i16, Legal);
1382 setTruncStoreAction(MVT::v2i64, MVT::v2i8, Legal);
1383 setTruncStoreAction(MVT::v2i64, MVT::v2i16, Legal);
1384 setTruncStoreAction(MVT::v2i64, MVT::v2i32, Legal);
1385 setTruncStoreAction(MVT::v4i32, MVT::v4i8, Legal);
1386 setTruncStoreAction(MVT::v4i32, MVT::v4i16, Legal);
1388 setOperationAction(ISD::TRUNCATE, MVT::i1, Custom);
1389 setOperationAction(ISD::TRUNCATE, MVT::v16i8, Custom);
1390 setOperationAction(ISD::TRUNCATE, MVT::v8i32, Custom);
1391 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v8i1, Custom);
1392 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v16i1, Custom);
1393 if (Subtarget->hasDQI()) {
1394 setOperationAction(ISD::TRUNCATE, MVT::v2i1, Custom);
1395 setOperationAction(ISD::TRUNCATE, MVT::v4i1, Custom);
1397 setOperationAction(ISD::SINT_TO_FP, MVT::v8i64, Legal);
1398 setOperationAction(ISD::UINT_TO_FP, MVT::v8i64, Legal);
1399 setOperationAction(ISD::FP_TO_SINT, MVT::v8i64, Legal);
1400 setOperationAction(ISD::FP_TO_UINT, MVT::v8i64, Legal);
1401 if (Subtarget->hasVLX()) {
1402 setOperationAction(ISD::SINT_TO_FP, MVT::v4i64, Legal);
1403 setOperationAction(ISD::SINT_TO_FP, MVT::v2i64, Legal);
1404 setOperationAction(ISD::UINT_TO_FP, MVT::v4i64, Legal);
1405 setOperationAction(ISD::UINT_TO_FP, MVT::v2i64, Legal);
1406 setOperationAction(ISD::FP_TO_SINT, MVT::v4i64, Legal);
1407 setOperationAction(ISD::FP_TO_SINT, MVT::v2i64, Legal);
1408 setOperationAction(ISD::FP_TO_UINT, MVT::v4i64, Legal);
1409 setOperationAction(ISD::FP_TO_UINT, MVT::v2i64, Legal);
1412 if (Subtarget->hasVLX()) {
1413 setOperationAction(ISD::SINT_TO_FP, MVT::v8i32, Legal);
1414 setOperationAction(ISD::UINT_TO_FP, MVT::v8i32, Legal);
1415 setOperationAction(ISD::FP_TO_SINT, MVT::v8i32, Legal);
1416 setOperationAction(ISD::FP_TO_UINT, MVT::v8i32, Legal);
1417 setOperationAction(ISD::SINT_TO_FP, MVT::v4i32, Legal);
1418 setOperationAction(ISD::UINT_TO_FP, MVT::v4i32, Legal);
1419 setOperationAction(ISD::FP_TO_SINT, MVT::v4i32, Legal);
1420 setOperationAction(ISD::FP_TO_UINT, MVT::v4i32, Legal);
1422 setOperationAction(ISD::TRUNCATE, MVT::v8i1, Custom);
1423 setOperationAction(ISD::TRUNCATE, MVT::v16i1, Custom);
1424 setOperationAction(ISD::TRUNCATE, MVT::v16i16, Custom);
1425 setOperationAction(ISD::ZERO_EXTEND, MVT::v16i32, Custom);
1426 setOperationAction(ISD::ZERO_EXTEND, MVT::v8i64, Custom);
1427 setOperationAction(ISD::ANY_EXTEND, MVT::v16i32, Custom);
1428 setOperationAction(ISD::ANY_EXTEND, MVT::v8i64, Custom);
1429 setOperationAction(ISD::SIGN_EXTEND, MVT::v16i32, Custom);
1430 setOperationAction(ISD::SIGN_EXTEND, MVT::v8i64, Custom);
1431 setOperationAction(ISD::SIGN_EXTEND, MVT::v16i8, Custom);
1432 setOperationAction(ISD::SIGN_EXTEND, MVT::v8i16, Custom);
1433 setOperationAction(ISD::SIGN_EXTEND, MVT::v16i16, Custom);
1434 if (Subtarget->hasDQI()) {
1435 setOperationAction(ISD::SIGN_EXTEND, MVT::v4i32, Custom);
1436 setOperationAction(ISD::SIGN_EXTEND, MVT::v2i64, Custom);
1438 setOperationAction(ISD::FFLOOR, MVT::v16f32, Legal);
1439 setOperationAction(ISD::FFLOOR, MVT::v8f64, Legal);
1440 setOperationAction(ISD::FCEIL, MVT::v16f32, Legal);
1441 setOperationAction(ISD::FCEIL, MVT::v8f64, Legal);
1442 setOperationAction(ISD::FTRUNC, MVT::v16f32, Legal);
1443 setOperationAction(ISD::FTRUNC, MVT::v8f64, Legal);
1444 setOperationAction(ISD::FRINT, MVT::v16f32, Legal);
1445 setOperationAction(ISD::FRINT, MVT::v8f64, Legal);
1446 setOperationAction(ISD::FNEARBYINT, MVT::v16f32, Legal);
1447 setOperationAction(ISD::FNEARBYINT, MVT::v8f64, Legal);
1449 setOperationAction(ISD::CONCAT_VECTORS, MVT::v8f64, Custom);
1450 setOperationAction(ISD::CONCAT_VECTORS, MVT::v8i64, Custom);
1451 setOperationAction(ISD::CONCAT_VECTORS, MVT::v16f32, Custom);
1452 setOperationAction(ISD::CONCAT_VECTORS, MVT::v16i32, Custom);
1453 setOperationAction(ISD::CONCAT_VECTORS, MVT::v16i1, Custom);
1455 setOperationAction(ISD::SETCC, MVT::v16i1, Custom);
1456 setOperationAction(ISD::SETCC, MVT::v8i1, Custom);
1458 setOperationAction(ISD::MUL, MVT::v8i64, Custom);
1460 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v8i1, Custom);
1461 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v16i1, Custom);
1462 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v16i1, Custom);
1463 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v8i1, Custom);
1464 setOperationAction(ISD::BUILD_VECTOR, MVT::v8i1, Custom);
1465 setOperationAction(ISD::BUILD_VECTOR, MVT::v16i1, Custom);
1466 setOperationAction(ISD::SELECT, MVT::v8f64, Custom);
1467 setOperationAction(ISD::SELECT, MVT::v8i64, Custom);
1468 setOperationAction(ISD::SELECT, MVT::v16f32, Custom);
1469 setOperationAction(ISD::SELECT, MVT::v16i1, Custom);
1470 setOperationAction(ISD::SELECT, MVT::v8i1, Custom);
1472 setOperationAction(ISD::SMAX, MVT::v16i32, Legal);
1473 setOperationAction(ISD::SMAX, MVT::v8i64, Legal);
1474 setOperationAction(ISD::UMAX, MVT::v16i32, Legal);
1475 setOperationAction(ISD::UMAX, MVT::v8i64, Legal);
1476 setOperationAction(ISD::SMIN, MVT::v16i32, Legal);
1477 setOperationAction(ISD::SMIN, MVT::v8i64, Legal);
1478 setOperationAction(ISD::UMIN, MVT::v16i32, Legal);
1479 setOperationAction(ISD::UMIN, MVT::v8i64, Legal);
1481 setOperationAction(ISD::ADD, MVT::v8i64, Legal);
1482 setOperationAction(ISD::ADD, MVT::v16i32, Legal);
1484 setOperationAction(ISD::SUB, MVT::v8i64, Legal);
1485 setOperationAction(ISD::SUB, MVT::v16i32, Legal);
1487 setOperationAction(ISD::MUL, MVT::v16i32, Legal);
1489 setOperationAction(ISD::SRL, MVT::v8i64, Custom);
1490 setOperationAction(ISD::SRL, MVT::v16i32, Custom);
1492 setOperationAction(ISD::SHL, MVT::v8i64, Custom);
1493 setOperationAction(ISD::SHL, MVT::v16i32, Custom);
1495 setOperationAction(ISD::SRA, MVT::v8i64, Custom);
1496 setOperationAction(ISD::SRA, MVT::v16i32, Custom);
1498 setOperationAction(ISD::AND, MVT::v8i64, Legal);
1499 setOperationAction(ISD::OR, MVT::v8i64, Legal);
1500 setOperationAction(ISD::XOR, MVT::v8i64, Legal);
1501 setOperationAction(ISD::AND, MVT::v16i32, Legal);
1502 setOperationAction(ISD::OR, MVT::v16i32, Legal);
1503 setOperationAction(ISD::XOR, MVT::v16i32, Legal);
1505 if (Subtarget->hasCDI()) {
1506 setOperationAction(ISD::CTLZ, MVT::v8i64, Legal);
1507 setOperationAction(ISD::CTLZ, MVT::v16i32, Legal);
1508 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v8i64, Legal);
1509 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v16i32, Legal);
1511 setOperationAction(ISD::CTLZ, MVT::v8i16, Custom);
1512 setOperationAction(ISD::CTLZ, MVT::v16i8, Custom);
1513 setOperationAction(ISD::CTLZ, MVT::v16i16, Custom);
1514 setOperationAction(ISD::CTLZ, MVT::v32i8, Custom);
1515 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v8i16, Custom);
1516 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v16i8, Custom);
1517 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v16i16, Custom);
1518 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v32i8, Custom);
1520 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v8i64, Custom);
1521 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v16i32, Custom);
1523 if (Subtarget->hasVLX()) {
1524 setOperationAction(ISD::CTLZ, MVT::v4i64, Legal);
1525 setOperationAction(ISD::CTLZ, MVT::v8i32, Legal);
1526 setOperationAction(ISD::CTLZ, MVT::v2i64, Legal);
1527 setOperationAction(ISD::CTLZ, MVT::v4i32, Legal);
1528 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v4i64, Legal);
1529 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v8i32, Legal);
1530 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v2i64, Legal);
1531 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v4i32, Legal);
1533 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v4i64, Custom);
1534 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v8i32, Custom);
1535 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v2i64, Custom);
1536 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::v4i32, Custom);
1538 setOperationAction(ISD::CTLZ, MVT::v4i64, Custom);
1539 setOperationAction(ISD::CTLZ, MVT::v8i32, Custom);
1540 setOperationAction(ISD::CTLZ, MVT::v2i64, Custom);
1541 setOperationAction(ISD::CTLZ, MVT::v4i32, Custom);
1542 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v4i64, Custom);
1543 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v8i32, Custom);
1544 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v2i64, Custom);
1545 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v4i32, Custom);
1547 } // Subtarget->hasCDI()
1549 if (Subtarget->hasDQI()) {
1550 setOperationAction(ISD::MUL, MVT::v2i64, Legal);
1551 setOperationAction(ISD::MUL, MVT::v4i64, Legal);
1552 setOperationAction(ISD::MUL, MVT::v8i64, Legal);
1554 // Custom lower several nodes.
1555 for (MVT VT : MVT::vector_valuetypes()) {
1556 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
1558 setOperationAction(ISD::AND, VT, Legal);
1559 setOperationAction(ISD::OR, VT, Legal);
1560 setOperationAction(ISD::XOR, VT, Legal);
1562 if (EltSize >= 32 && VT.getSizeInBits() <= 512) {
1563 setOperationAction(ISD::MGATHER, VT, Custom);
1564 setOperationAction(ISD::MSCATTER, VT, Custom);
1566 // Extract subvector is special because the value type
1567 // (result) is 256/128-bit but the source is 512-bit wide.
1568 if (VT.is128BitVector() || VT.is256BitVector()) {
1569 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT, Custom);
1571 if (VT.getVectorElementType() == MVT::i1)
1572 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT, Legal);
1574 // Do not attempt to custom lower other non-512-bit vectors
1575 if (!VT.is512BitVector())
1578 if (EltSize >= 32) {
1579 setOperationAction(ISD::VECTOR_SHUFFLE, VT, Custom);
1580 setOperationAction(ISD::INSERT_VECTOR_ELT, VT, Custom);
1581 setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
1582 setOperationAction(ISD::VSELECT, VT, Legal);
1583 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT, Custom);
1584 setOperationAction(ISD::SCALAR_TO_VECTOR, VT, Custom);
1585 setOperationAction(ISD::INSERT_SUBVECTOR, VT, Custom);
1586 setOperationAction(ISD::MLOAD, VT, Legal);
1587 setOperationAction(ISD::MSTORE, VT, Legal);
1590 for (auto VT : { MVT::v64i8, MVT::v32i16, MVT::v16i32 }) {
1591 setOperationAction(ISD::SELECT, VT, Promote);
1592 AddPromotedToType (ISD::SELECT, VT, MVT::v8i64);
1596 if (!Subtarget->useSoftFloat() && Subtarget->hasBWI()) {
1597 addRegisterClass(MVT::v32i16, &X86::VR512RegClass);
1598 addRegisterClass(MVT::v64i8, &X86::VR512RegClass);
1600 addRegisterClass(MVT::v32i1, &X86::VK32RegClass);
1601 addRegisterClass(MVT::v64i1, &X86::VK64RegClass);
1603 setOperationAction(ISD::LOAD, MVT::v32i16, Legal);
1604 setOperationAction(ISD::LOAD, MVT::v64i8, Legal);
1605 setOperationAction(ISD::SETCC, MVT::v32i1, Custom);
1606 setOperationAction(ISD::SETCC, MVT::v64i1, Custom);
1607 setOperationAction(ISD::ADD, MVT::v32i16, Legal);
1608 setOperationAction(ISD::ADD, MVT::v64i8, Legal);
1609 setOperationAction(ISD::SUB, MVT::v32i16, Legal);
1610 setOperationAction(ISD::SUB, MVT::v64i8, Legal);
1611 setOperationAction(ISD::MUL, MVT::v32i16, Legal);
1612 setOperationAction(ISD::MULHS, MVT::v32i16, Legal);
1613 setOperationAction(ISD::MULHU, MVT::v32i16, Legal);
1614 setOperationAction(ISD::CONCAT_VECTORS, MVT::v32i1, Custom);
1615 setOperationAction(ISD::CONCAT_VECTORS, MVT::v64i1, Custom);
1616 setOperationAction(ISD::CONCAT_VECTORS, MVT::v32i16, Custom);
1617 setOperationAction(ISD::CONCAT_VECTORS, MVT::v64i8, Custom);
1618 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v32i1, Custom);
1619 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v64i1, Custom);
1620 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v32i16, Custom);
1621 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v64i8, Custom);
1622 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v32i16, Custom);
1623 setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v64i8, Custom);
1624 setOperationAction(ISD::SELECT, MVT::v32i1, Custom);
1625 setOperationAction(ISD::SELECT, MVT::v64i1, Custom);
1626 setOperationAction(ISD::SIGN_EXTEND, MVT::v32i8, Custom);
1627 setOperationAction(ISD::ZERO_EXTEND, MVT::v32i8, Custom);
1628 setOperationAction(ISD::SIGN_EXTEND, MVT::v32i16, Custom);
1629 setOperationAction(ISD::ZERO_EXTEND, MVT::v32i16, Custom);
1630 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v32i16, Custom);
1631 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v64i8, Custom);
1632 setOperationAction(ISD::SIGN_EXTEND, MVT::v64i8, Custom);
1633 setOperationAction(ISD::ZERO_EXTEND, MVT::v64i8, Custom);
1634 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v32i1, Custom);
1635 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v64i1, Custom);
1636 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v32i16, Custom);
1637 setOperationAction(ISD::INSERT_VECTOR_ELT, MVT::v64i8, Custom);
1638 setOperationAction(ISD::VSELECT, MVT::v32i16, Legal);
1639 setOperationAction(ISD::VSELECT, MVT::v64i8, Legal);
1640 setOperationAction(ISD::TRUNCATE, MVT::v32i1, Custom);
1641 setOperationAction(ISD::TRUNCATE, MVT::v64i1, Custom);
1642 setOperationAction(ISD::TRUNCATE, MVT::v32i8, Custom);
1643 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v32i1, Custom);
1644 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v64i1, Custom);
1646 setOperationAction(ISD::SMAX, MVT::v64i8, Legal);
1647 setOperationAction(ISD::SMAX, MVT::v32i16, Legal);
1648 setOperationAction(ISD::UMAX, MVT::v64i8, Legal);
1649 setOperationAction(ISD::UMAX, MVT::v32i16, Legal);
1650 setOperationAction(ISD::SMIN, MVT::v64i8, Legal);
1651 setOperationAction(ISD::SMIN, MVT::v32i16, Legal);
1652 setOperationAction(ISD::UMIN, MVT::v64i8, Legal);
1653 setOperationAction(ISD::UMIN, MVT::v32i16, Legal);
1655 setTruncStoreAction(MVT::v32i16, MVT::v32i8, Legal);
1656 setTruncStoreAction(MVT::v16i16, MVT::v16i8, Legal);
1657 if (Subtarget->hasVLX())
1658 setTruncStoreAction(MVT::v8i16, MVT::v8i8, Legal);
1660 if (Subtarget->hasCDI()) {
1661 setOperationAction(ISD::CTLZ, MVT::v32i16, Custom);
1662 setOperationAction(ISD::CTLZ, MVT::v64i8, Custom);
1663 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v32i16, Custom);
1664 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::v64i8, Custom);
1667 for (auto VT : { MVT::v64i8, MVT::v32i16 }) {
1668 setOperationAction(ISD::BUILD_VECTOR, VT, Custom);
1669 setOperationAction(ISD::VSELECT, VT, Legal);
1673 if (!Subtarget->useSoftFloat() && Subtarget->hasVLX()) {
1674 addRegisterClass(MVT::v4i1, &X86::VK4RegClass);
1675 addRegisterClass(MVT::v2i1, &X86::VK2RegClass);
1677 setOperationAction(ISD::SETCC, MVT::v4i1, Custom);
1678 setOperationAction(ISD::SETCC, MVT::v2i1, Custom);
1679 setOperationAction(ISD::CONCAT_VECTORS, MVT::v4i1, Custom);
1680 setOperationAction(ISD::CONCAT_VECTORS, MVT::v8i1, Custom);
1681 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v8i1, Custom);
1682 setOperationAction(ISD::INSERT_SUBVECTOR, MVT::v4i1, Custom);
1683 setOperationAction(ISD::SELECT, MVT::v4i1, Custom);
1684 setOperationAction(ISD::SELECT, MVT::v2i1, Custom);
1685 setOperationAction(ISD::BUILD_VECTOR, MVT::v4i1, Custom);
1686 setOperationAction(ISD::BUILD_VECTOR, MVT::v2i1, Custom);
1687 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v2i1, Custom);
1688 setOperationAction(ISD::VECTOR_SHUFFLE, MVT::v4i1, Custom);
1690 setOperationAction(ISD::AND, MVT::v8i32, Legal);
1691 setOperationAction(ISD::OR, MVT::v8i32, Legal);
1692 setOperationAction(ISD::XOR, MVT::v8i32, Legal);
1693 setOperationAction(ISD::AND, MVT::v4i32, Legal);
1694 setOperationAction(ISD::OR, MVT::v4i32, Legal);
1695 setOperationAction(ISD::XOR, MVT::v4i32, Legal);
1696 setOperationAction(ISD::SRA, MVT::v2i64, Custom);
1697 setOperationAction(ISD::SRA, MVT::v4i64, Custom);
1699 setOperationAction(ISD::SMAX, MVT::v2i64, Legal);
1700 setOperationAction(ISD::SMAX, MVT::v4i64, Legal);
1701 setOperationAction(ISD::UMAX, MVT::v2i64, Legal);
1702 setOperationAction(ISD::UMAX, MVT::v4i64, Legal);
1703 setOperationAction(ISD::SMIN, MVT::v2i64, Legal);
1704 setOperationAction(ISD::SMIN, MVT::v4i64, Legal);
1705 setOperationAction(ISD::UMIN, MVT::v2i64, Legal);
1706 setOperationAction(ISD::UMIN, MVT::v4i64, Legal);
1709 // We want to custom lower some of our intrinsics.
1710 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
1711 setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::Other, Custom);
1712 setOperationAction(ISD::INTRINSIC_VOID, MVT::Other, Custom);
1713 if (!Subtarget->is64Bit())
1714 setOperationAction(ISD::INTRINSIC_W_CHAIN, MVT::i64, Custom);
1716 // Only custom-lower 64-bit SADDO and friends on 64-bit because we don't
1717 // handle type legalization for these operations here.
1719 // FIXME: We really should do custom legalization for addition and
1720 // subtraction on x86-32 once PR3203 is fixed. We really can't do much better
1721 // than generic legalization for 64-bit multiplication-with-overflow, though.
1722 for (auto VT : { MVT::i8, MVT::i16, MVT::i32, MVT::i64 }) {
1723 if (VT == MVT::i64 && !Subtarget->is64Bit())
1725 // Add/Sub/Mul with overflow operations are custom lowered.
1726 setOperationAction(ISD::SADDO, VT, Custom);
1727 setOperationAction(ISD::UADDO, VT, Custom);
1728 setOperationAction(ISD::SSUBO, VT, Custom);
1729 setOperationAction(ISD::USUBO, VT, Custom);
1730 setOperationAction(ISD::SMULO, VT, Custom);
1731 setOperationAction(ISD::UMULO, VT, Custom);
1734 if (!Subtarget->is64Bit()) {
1735 // These libcalls are not available in 32-bit.
1736 setLibcallName(RTLIB::SHL_I128, nullptr);
1737 setLibcallName(RTLIB::SRL_I128, nullptr);
1738 setLibcallName(RTLIB::SRA_I128, nullptr);
1741 // Combine sin / cos into one node or libcall if possible.
1742 if (Subtarget->hasSinCos()) {
1743 setLibcallName(RTLIB::SINCOS_F32, "sincosf");
1744 setLibcallName(RTLIB::SINCOS_F64, "sincos");
1745 if (Subtarget->isTargetDarwin()) {
1746 // For MacOSX, we don't want the normal expansion of a libcall to sincos.
1747 // We want to issue a libcall to __sincos_stret to avoid memory traffic.
1748 setOperationAction(ISD::FSINCOS, MVT::f64, Custom);
1749 setOperationAction(ISD::FSINCOS, MVT::f32, Custom);
1753 if (Subtarget->isTargetWin64()) {
1754 setOperationAction(ISD::SDIV, MVT::i128, Custom);
1755 setOperationAction(ISD::UDIV, MVT::i128, Custom);
1756 setOperationAction(ISD::SREM, MVT::i128, Custom);
1757 setOperationAction(ISD::UREM, MVT::i128, Custom);
1758 setOperationAction(ISD::SDIVREM, MVT::i128, Custom);
1759 setOperationAction(ISD::UDIVREM, MVT::i128, Custom);
1762 // We have target-specific dag combine patterns for the following nodes:
1763 setTargetDAGCombine(ISD::VECTOR_SHUFFLE);
1764 setTargetDAGCombine(ISD::EXTRACT_VECTOR_ELT);
1765 setTargetDAGCombine(ISD::BITCAST);
1766 setTargetDAGCombine(ISD::VSELECT);
1767 setTargetDAGCombine(ISD::SELECT);
1768 setTargetDAGCombine(ISD::SHL);
1769 setTargetDAGCombine(ISD::SRA);
1770 setTargetDAGCombine(ISD::SRL);
1771 setTargetDAGCombine(ISD::OR);
1772 setTargetDAGCombine(ISD::AND);
1773 setTargetDAGCombine(ISD::ADD);
1774 setTargetDAGCombine(ISD::FADD);
1775 setTargetDAGCombine(ISD::FSUB);
1776 setTargetDAGCombine(ISD::FNEG);
1777 setTargetDAGCombine(ISD::FMA);
1778 setTargetDAGCombine(ISD::SUB);
1779 setTargetDAGCombine(ISD::LOAD);
1780 setTargetDAGCombine(ISD::MLOAD);
1781 setTargetDAGCombine(ISD::STORE);
1782 setTargetDAGCombine(ISD::MSTORE);
1783 setTargetDAGCombine(ISD::TRUNCATE);
1784 setTargetDAGCombine(ISD::ZERO_EXTEND);
1785 setTargetDAGCombine(ISD::ANY_EXTEND);
1786 setTargetDAGCombine(ISD::SIGN_EXTEND);
1787 setTargetDAGCombine(ISD::SIGN_EXTEND_INREG);
1788 setTargetDAGCombine(ISD::SINT_TO_FP);
1789 setTargetDAGCombine(ISD::UINT_TO_FP);
1790 setTargetDAGCombine(ISD::SETCC);
1791 setTargetDAGCombine(ISD::BUILD_VECTOR);
1792 setTargetDAGCombine(ISD::MUL);
1793 setTargetDAGCombine(ISD::XOR);
1795 computeRegisterProperties(Subtarget->getRegisterInfo());
1797 MaxStoresPerMemset = 16; // For @llvm.memset -> sequence of stores
1798 MaxStoresPerMemsetOptSize = 8;
1799 MaxStoresPerMemcpy = 8; // For @llvm.memcpy -> sequence of stores
1800 MaxStoresPerMemcpyOptSize = 4;
1801 MaxStoresPerMemmove = 8; // For @llvm.memmove -> sequence of stores
1802 MaxStoresPerMemmoveOptSize = 4;
1803 setPrefLoopAlignment(4); // 2^4 bytes.
1805 // A predictable cmov does not hurt on an in-order CPU.
1806 // FIXME: Use a CPU attribute to trigger this, not a CPU model.
1807 PredictableSelectIsExpensive = !Subtarget->isAtom();
1808 EnableExtLdPromotion = true;
1809 setPrefFunctionAlignment(4); // 2^4 bytes.
1811 verifyIntrinsicTables();
1814 // This has so far only been implemented for 64-bit MachO.
1815 bool X86TargetLowering::useLoadStackGuardNode() const {
1816 return Subtarget->isTargetMachO() && Subtarget->is64Bit();
1819 TargetLoweringBase::LegalizeTypeAction
1820 X86TargetLowering::getPreferredVectorAction(EVT VT) const {
1821 if (ExperimentalVectorWideningLegalization &&
1822 VT.getVectorNumElements() != 1 &&
1823 VT.getVectorElementType().getSimpleVT() != MVT::i1)
1824 return TypeWidenVector;
1826 return TargetLoweringBase::getPreferredVectorAction(VT);
1829 EVT X86TargetLowering::getSetCCResultType(const DataLayout &DL, LLVMContext &,
1832 return Subtarget->hasAVX512() ? MVT::i1: MVT::i8;
1834 if (VT.isSimple()) {
1835 MVT VVT = VT.getSimpleVT();
1836 const unsigned NumElts = VVT.getVectorNumElements();
1837 const MVT EltVT = VVT.getVectorElementType();
1838 if (VVT.is512BitVector()) {
1839 if (Subtarget->hasAVX512())
1840 if (EltVT == MVT::i32 || EltVT == MVT::i64 ||
1841 EltVT == MVT::f32 || EltVT == MVT::f64)
1843 case 8: return MVT::v8i1;
1844 case 16: return MVT::v16i1;
1846 if (Subtarget->hasBWI())
1847 if (EltVT == MVT::i8 || EltVT == MVT::i16)
1849 case 32: return MVT::v32i1;
1850 case 64: return MVT::v64i1;
1854 if (VVT.is256BitVector() || VVT.is128BitVector()) {
1855 if (Subtarget->hasVLX())
1856 if (EltVT == MVT::i32 || EltVT == MVT::i64 ||
1857 EltVT == MVT::f32 || EltVT == MVT::f64)
1859 case 2: return MVT::v2i1;
1860 case 4: return MVT::v4i1;
1861 case 8: return MVT::v8i1;
1863 if (Subtarget->hasBWI() && Subtarget->hasVLX())
1864 if (EltVT == MVT::i8 || EltVT == MVT::i16)
1866 case 8: return MVT::v8i1;
1867 case 16: return MVT::v16i1;
1868 case 32: return MVT::v32i1;
1873 return VT.changeVectorElementTypeToInteger();
1876 /// Helper for getByValTypeAlignment to determine
1877 /// the desired ByVal argument alignment.
1878 static void getMaxByValAlign(Type *Ty, unsigned &MaxAlign) {
1881 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
1882 if (VTy->getBitWidth() == 128)
1884 } else if (ArrayType *ATy = dyn_cast<ArrayType>(Ty)) {
1885 unsigned EltAlign = 0;
1886 getMaxByValAlign(ATy->getElementType(), EltAlign);
1887 if (EltAlign > MaxAlign)
1888 MaxAlign = EltAlign;
1889 } else if (StructType *STy = dyn_cast<StructType>(Ty)) {
1890 for (auto *EltTy : STy->elements()) {
1891 unsigned EltAlign = 0;
1892 getMaxByValAlign(EltTy, EltAlign);
1893 if (EltAlign > MaxAlign)
1894 MaxAlign = EltAlign;
1901 /// Return the desired alignment for ByVal aggregate
1902 /// function arguments in the caller parameter area. For X86, aggregates
1903 /// that contain SSE vectors are placed at 16-byte boundaries while the rest
1904 /// are at 4-byte boundaries.
1905 unsigned X86TargetLowering::getByValTypeAlignment(Type *Ty,
1906 const DataLayout &DL) const {
1907 if (Subtarget->is64Bit()) {
1908 // Max of 8 and alignment of type.
1909 unsigned TyAlign = DL.getABITypeAlignment(Ty);
1916 if (Subtarget->hasSSE1())
1917 getMaxByValAlign(Ty, Align);
1921 /// Returns the target specific optimal type for load
1922 /// and store operations as a result of memset, memcpy, and memmove
1923 /// lowering. If DstAlign is zero that means it's safe to destination
1924 /// alignment can satisfy any constraint. Similarly if SrcAlign is zero it
1925 /// means there isn't a need to check it against alignment requirement,
1926 /// probably because the source does not need to be loaded. If 'IsMemset' is
1927 /// true, that means it's expanding a memset. If 'ZeroMemset' is true, that
1928 /// means it's a memset of zero. 'MemcpyStrSrc' indicates whether the memcpy
1929 /// source is constant so it does not need to be loaded.
1930 /// It returns EVT::Other if the type should be determined using generic
1931 /// target-independent logic.
1933 X86TargetLowering::getOptimalMemOpType(uint64_t Size,
1934 unsigned DstAlign, unsigned SrcAlign,
1935 bool IsMemset, bool ZeroMemset,
1937 MachineFunction &MF) const {
1938 const Function *F = MF.getFunction();
1939 if ((!IsMemset || ZeroMemset) &&
1940 !F->hasFnAttribute(Attribute::NoImplicitFloat)) {
1942 (!Subtarget->isUnalignedMem16Slow() ||
1943 ((DstAlign == 0 || DstAlign >= 16) &&
1944 (SrcAlign == 0 || SrcAlign >= 16)))) {
1946 // FIXME: Check if unaligned 32-byte accesses are slow.
1947 if (Subtarget->hasInt256())
1949 if (Subtarget->hasFp256())
1952 if (Subtarget->hasSSE2())
1954 if (Subtarget->hasSSE1())
1956 } else if (!MemcpyStrSrc && Size >= 8 &&
1957 !Subtarget->is64Bit() &&
1958 Subtarget->hasSSE2()) {
1959 // Do not use f64 to lower memcpy if source is string constant. It's
1960 // better to use i32 to avoid the loads.
1964 // This is a compromise. If we reach here, unaligned accesses may be slow on
1965 // this target. However, creating smaller, aligned accesses could be even
1966 // slower and would certainly be a lot more code.
1967 if (Subtarget->is64Bit() && Size >= 8)
1972 bool X86TargetLowering::isSafeMemOpType(MVT VT) const {
1974 return X86ScalarSSEf32;
1975 else if (VT == MVT::f64)
1976 return X86ScalarSSEf64;
1981 X86TargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
1986 switch (VT.getSizeInBits()) {
1988 // 8-byte and under are always assumed to be fast.
1992 *Fast = !Subtarget->isUnalignedMem16Slow();
1995 *Fast = !Subtarget->isUnalignedMem32Slow();
1997 // TODO: What about AVX-512 (512-bit) accesses?
2000 // Misaligned accesses of any size are always allowed.
2004 /// Return the entry encoding for a jump table in the
2005 /// current function. The returned value is a member of the
2006 /// MachineJumpTableInfo::JTEntryKind enum.
2007 unsigned X86TargetLowering::getJumpTableEncoding() const {
2008 // In GOT pic mode, each entry in the jump table is emitted as a @GOTOFF
2010 if (getTargetMachine().getRelocationModel() == Reloc::PIC_ &&
2011 Subtarget->isPICStyleGOT())
2012 return MachineJumpTableInfo::EK_Custom32;
2014 // Otherwise, use the normal jump table encoding heuristics.
2015 return TargetLowering::getJumpTableEncoding();
2018 bool X86TargetLowering::useSoftFloat() const {
2019 return Subtarget->useSoftFloat();
2023 X86TargetLowering::LowerCustomJumpTableEntry(const MachineJumpTableInfo *MJTI,
2024 const MachineBasicBlock *MBB,
2025 unsigned uid,MCContext &Ctx) const{
2026 assert(MBB->getParent()->getTarget().getRelocationModel() == Reloc::PIC_ &&
2027 Subtarget->isPICStyleGOT());
2028 // In 32-bit ELF systems, our jump table entries are formed with @GOTOFF
2030 return MCSymbolRefExpr::create(MBB->getSymbol(),
2031 MCSymbolRefExpr::VK_GOTOFF, Ctx);
2034 /// Returns relocation base for the given PIC jumptable.
2035 SDValue X86TargetLowering::getPICJumpTableRelocBase(SDValue Table,
2036 SelectionDAG &DAG) const {
2037 if (!Subtarget->is64Bit())
2038 // This doesn't have SDLoc associated with it, but is not really the
2039 // same as a Register.
2040 return DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(),
2041 getPointerTy(DAG.getDataLayout()));
2045 /// This returns the relocation base for the given PIC jumptable,
2046 /// the same as getPICJumpTableRelocBase, but as an MCExpr.
2047 const MCExpr *X86TargetLowering::
2048 getPICJumpTableRelocBaseExpr(const MachineFunction *MF, unsigned JTI,
2049 MCContext &Ctx) const {
2050 // X86-64 uses RIP relative addressing based on the jump table label.
2051 if (Subtarget->isPICStyleRIPRel())
2052 return TargetLowering::getPICJumpTableRelocBaseExpr(MF, JTI, Ctx);
2054 // Otherwise, the reference is relative to the PIC base.
2055 return MCSymbolRefExpr::create(MF->getPICBaseSymbol(), Ctx);
2058 std::pair<const TargetRegisterClass *, uint8_t>
2059 X86TargetLowering::findRepresentativeClass(const TargetRegisterInfo *TRI,
2061 const TargetRegisterClass *RRC = nullptr;
2063 switch (VT.SimpleTy) {
2065 return TargetLowering::findRepresentativeClass(TRI, VT);
2066 case MVT::i8: case MVT::i16: case MVT::i32: case MVT::i64:
2067 RRC = Subtarget->is64Bit() ? &X86::GR64RegClass : &X86::GR32RegClass;
2070 RRC = &X86::VR64RegClass;
2072 case MVT::f32: case MVT::f64:
2073 case MVT::v16i8: case MVT::v8i16: case MVT::v4i32: case MVT::v2i64:
2074 case MVT::v4f32: case MVT::v2f64:
2075 case MVT::v32i8: case MVT::v8i32: case MVT::v4i64: case MVT::v8f32:
2077 RRC = &X86::VR128RegClass;
2080 return std::make_pair(RRC, Cost);
2083 bool X86TargetLowering::getStackCookieLocation(unsigned &AddressSpace,
2084 unsigned &Offset) const {
2085 if (!Subtarget->isTargetLinux())
2088 if (Subtarget->is64Bit()) {
2089 // %fs:0x28, unless we're using a Kernel code model, in which case it's %gs:
2091 if (getTargetMachine().getCodeModel() == CodeModel::Kernel)
2103 Value *X86TargetLowering::getSafeStackPointerLocation(IRBuilder<> &IRB) const {
2104 if (!Subtarget->isTargetAndroid())
2105 return TargetLowering::getSafeStackPointerLocation(IRB);
2107 // Android provides a fixed TLS slot for the SafeStack pointer. See the
2108 // definition of TLS_SLOT_SAFESTACK in
2109 // https://android.googlesource.com/platform/bionic/+/master/libc/private/bionic_tls.h
2110 unsigned AddressSpace, Offset;
2111 if (Subtarget->is64Bit()) {
2112 // %fs:0x48, unless we're using a Kernel code model, in which case it's %gs:
2114 if (getTargetMachine().getCodeModel() == CodeModel::Kernel)
2124 return ConstantExpr::getIntToPtr(
2125 ConstantInt::get(Type::getInt32Ty(IRB.getContext()), Offset),
2126 Type::getInt8PtrTy(IRB.getContext())->getPointerTo(AddressSpace));
2129 bool X86TargetLowering::isNoopAddrSpaceCast(unsigned SrcAS,
2130 unsigned DestAS) const {
2131 assert(SrcAS != DestAS && "Expected different address spaces!");
2133 return SrcAS < 256 && DestAS < 256;
2136 //===----------------------------------------------------------------------===//
2137 // Return Value Calling Convention Implementation
2138 //===----------------------------------------------------------------------===//
2140 #include "X86GenCallingConv.inc"
2142 bool X86TargetLowering::CanLowerReturn(
2143 CallingConv::ID CallConv, MachineFunction &MF, bool isVarArg,
2144 const SmallVectorImpl<ISD::OutputArg> &Outs, LLVMContext &Context) const {
2145 SmallVector<CCValAssign, 16> RVLocs;
2146 CCState CCInfo(CallConv, isVarArg, MF, RVLocs, Context);
2147 return CCInfo.CheckReturn(Outs, RetCC_X86);
2150 const MCPhysReg *X86TargetLowering::getScratchRegisters(CallingConv::ID) const {
2151 static const MCPhysReg ScratchRegs[] = { X86::R11, 0 };
2156 X86TargetLowering::LowerReturn(SDValue Chain,
2157 CallingConv::ID CallConv, bool isVarArg,
2158 const SmallVectorImpl<ISD::OutputArg> &Outs,
2159 const SmallVectorImpl<SDValue> &OutVals,
2160 SDLoc dl, SelectionDAG &DAG) const {
2161 MachineFunction &MF = DAG.getMachineFunction();
2162 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
2164 SmallVector<CCValAssign, 16> RVLocs;
2165 CCState CCInfo(CallConv, isVarArg, MF, RVLocs, *DAG.getContext());
2166 CCInfo.AnalyzeReturn(Outs, RetCC_X86);
2169 SmallVector<SDValue, 6> RetOps;
2170 RetOps.push_back(Chain); // Operand #0 = Chain (updated below)
2171 // Operand #1 = Bytes To Pop
2172 RetOps.push_back(DAG.getTargetConstant(FuncInfo->getBytesToPopOnReturn(), dl,
2175 // Copy the result values into the output registers.
2176 for (unsigned i = 0; i != RVLocs.size(); ++i) {
2177 CCValAssign &VA = RVLocs[i];
2178 assert(VA.isRegLoc() && "Can only return in registers!");
2179 SDValue ValToCopy = OutVals[i];
2180 EVT ValVT = ValToCopy.getValueType();
2182 // Promote values to the appropriate types.
2183 if (VA.getLocInfo() == CCValAssign::SExt)
2184 ValToCopy = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ValToCopy);
2185 else if (VA.getLocInfo() == CCValAssign::ZExt)
2186 ValToCopy = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), ValToCopy);
2187 else if (VA.getLocInfo() == CCValAssign::AExt) {
2188 if (ValVT.isVector() && ValVT.getVectorElementType() == MVT::i1)
2189 ValToCopy = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ValToCopy);
2191 ValToCopy = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), ValToCopy);
2193 else if (VA.getLocInfo() == CCValAssign::BCvt)
2194 ValToCopy = DAG.getBitcast(VA.getLocVT(), ValToCopy);
2196 assert(VA.getLocInfo() != CCValAssign::FPExt &&
2197 "Unexpected FP-extend for return value.");
2199 // If this is x86-64, and we disabled SSE, we can't return FP values,
2200 // or SSE or MMX vectors.
2201 if ((ValVT == MVT::f32 || ValVT == MVT::f64 ||
2202 VA.getLocReg() == X86::XMM0 || VA.getLocReg() == X86::XMM1) &&
2203 (Subtarget->is64Bit() && !Subtarget->hasSSE1())) {
2204 report_fatal_error("SSE register return with SSE disabled");
2206 // Likewise we can't return F64 values with SSE1 only. gcc does so, but
2207 // llvm-gcc has never done it right and no one has noticed, so this
2208 // should be OK for now.
2209 if (ValVT == MVT::f64 &&
2210 (Subtarget->is64Bit() && !Subtarget->hasSSE2()))
2211 report_fatal_error("SSE2 register return with SSE2 disabled");
2213 // Returns in ST0/ST1 are handled specially: these are pushed as operands to
2214 // the RET instruction and handled by the FP Stackifier.
2215 if (VA.getLocReg() == X86::FP0 ||
2216 VA.getLocReg() == X86::FP1) {
2217 // If this is a copy from an xmm register to ST(0), use an FPExtend to
2218 // change the value to the FP stack register class.
2219 if (isScalarFPTypeInSSEReg(VA.getValVT()))
2220 ValToCopy = DAG.getNode(ISD::FP_EXTEND, dl, MVT::f80, ValToCopy);
2221 RetOps.push_back(ValToCopy);
2222 // Don't emit a copytoreg.
2226 // 64-bit vector (MMX) values are returned in XMM0 / XMM1 except for v1i64
2227 // which is returned in RAX / RDX.
2228 if (Subtarget->is64Bit()) {
2229 if (ValVT == MVT::x86mmx) {
2230 if (VA.getLocReg() == X86::XMM0 || VA.getLocReg() == X86::XMM1) {
2231 ValToCopy = DAG.getBitcast(MVT::i64, ValToCopy);
2232 ValToCopy = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64,
2234 // If we don't have SSE2 available, convert to v4f32 so the generated
2235 // register is legal.
2236 if (!Subtarget->hasSSE2())
2237 ValToCopy = DAG.getBitcast(MVT::v4f32, ValToCopy);
2242 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ValToCopy, Flag);
2243 Flag = Chain.getValue(1);
2244 RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
2247 // All x86 ABIs require that for returning structs by value we copy
2248 // the sret argument into %rax/%eax (depending on ABI) for the return.
2249 // We saved the argument into a virtual register in the entry block,
2250 // so now we copy the value out and into %rax/%eax.
2252 // Checking Function.hasStructRetAttr() here is insufficient because the IR
2253 // may not have an explicit sret argument. If FuncInfo.CanLowerReturn is
2254 // false, then an sret argument may be implicitly inserted in the SelDAG. In
2255 // either case FuncInfo->setSRetReturnReg() will have been called.
2256 if (unsigned SRetReg = FuncInfo->getSRetReturnReg()) {
2257 SDValue Val = DAG.getCopyFromReg(Chain, dl, SRetReg,
2258 getPointerTy(MF.getDataLayout()));
2261 = (Subtarget->is64Bit() && !Subtarget->isTarget64BitILP32()) ?
2262 X86::RAX : X86::EAX;
2263 Chain = DAG.getCopyToReg(Chain, dl, RetValReg, Val, Flag);
2264 Flag = Chain.getValue(1);
2266 // RAX/EAX now acts like a return value.
2268 DAG.getRegister(RetValReg, getPointerTy(DAG.getDataLayout())));
2271 RetOps[0] = Chain; // Update chain.
2273 // Add the flag if we have it.
2275 RetOps.push_back(Flag);
2277 return DAG.getNode(X86ISD::RET_FLAG, dl, MVT::Other, RetOps);
2280 bool X86TargetLowering::isUsedByReturnOnly(SDNode *N, SDValue &Chain) const {
2281 if (N->getNumValues() != 1)
2283 if (!N->hasNUsesOfValue(1, 0))
2286 SDValue TCChain = Chain;
2287 SDNode *Copy = *N->use_begin();
2288 if (Copy->getOpcode() == ISD::CopyToReg) {
2289 // If the copy has a glue operand, we conservatively assume it isn't safe to
2290 // perform a tail call.
2291 if (Copy->getOperand(Copy->getNumOperands()-1).getValueType() == MVT::Glue)
2293 TCChain = Copy->getOperand(0);
2294 } else if (Copy->getOpcode() != ISD::FP_EXTEND)
2297 bool HasRet = false;
2298 for (SDNode::use_iterator UI = Copy->use_begin(), UE = Copy->use_end();
2300 if (UI->getOpcode() != X86ISD::RET_FLAG)
2302 // If we are returning more than one value, we can definitely
2303 // not make a tail call see PR19530
2304 if (UI->getNumOperands() > 4)
2306 if (UI->getNumOperands() == 4 &&
2307 UI->getOperand(UI->getNumOperands()-1).getValueType() != MVT::Glue)
2320 X86TargetLowering::getTypeForExtArgOrReturn(LLVMContext &Context, EVT VT,
2321 ISD::NodeType ExtendKind) const {
2323 // TODO: Is this also valid on 32-bit?
2324 if (Subtarget->is64Bit() && VT == MVT::i1 && ExtendKind == ISD::ZERO_EXTEND)
2325 ReturnMVT = MVT::i8;
2327 ReturnMVT = MVT::i32;
2329 EVT MinVT = getRegisterType(Context, ReturnMVT);
2330 return VT.bitsLT(MinVT) ? MinVT : VT;
2333 /// Lower the result values of a call into the
2334 /// appropriate copies out of appropriate physical registers.
2337 X86TargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
2338 CallingConv::ID CallConv, bool isVarArg,
2339 const SmallVectorImpl<ISD::InputArg> &Ins,
2340 SDLoc dl, SelectionDAG &DAG,
2341 SmallVectorImpl<SDValue> &InVals) const {
2343 // Assign locations to each value returned by this call.
2344 SmallVector<CCValAssign, 16> RVLocs;
2345 bool Is64Bit = Subtarget->is64Bit();
2346 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
2348 CCInfo.AnalyzeCallResult(Ins, RetCC_X86);
2350 // Copy all of the result registers out of their specified physreg.
2351 for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
2352 CCValAssign &VA = RVLocs[i];
2353 EVT CopyVT = VA.getLocVT();
2355 // If this is x86-64, and we disabled SSE, we can't return FP values
2356 if ((CopyVT == MVT::f32 || CopyVT == MVT::f64) &&
2357 ((Is64Bit || Ins[i].Flags.isInReg()) && !Subtarget->hasSSE1())) {
2358 report_fatal_error("SSE register return with SSE disabled");
2361 // If we prefer to use the value in xmm registers, copy it out as f80 and
2362 // use a truncate to move it from fp stack reg to xmm reg.
2363 bool RoundAfterCopy = false;
2364 if ((VA.getLocReg() == X86::FP0 || VA.getLocReg() == X86::FP1) &&
2365 isScalarFPTypeInSSEReg(VA.getValVT())) {
2367 RoundAfterCopy = (CopyVT != VA.getLocVT());
2370 Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(),
2371 CopyVT, InFlag).getValue(1);
2372 SDValue Val = Chain.getValue(0);
2375 Val = DAG.getNode(ISD::FP_ROUND, dl, VA.getValVT(), Val,
2376 // This truncation won't change the value.
2377 DAG.getIntPtrConstant(1, dl));
2379 if (VA.isExtInLoc() && VA.getValVT().getScalarType() == MVT::i1)
2380 Val = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val);
2382 InFlag = Chain.getValue(2);
2383 InVals.push_back(Val);
2389 //===----------------------------------------------------------------------===//
2390 // C & StdCall & Fast Calling Convention implementation
2391 //===----------------------------------------------------------------------===//
2392 // StdCall calling convention seems to be standard for many Windows' API
2393 // routines and around. It differs from C calling convention just a little:
2394 // callee should clean up the stack, not caller. Symbols should be also
2395 // decorated in some fancy way :) It doesn't support any vector arguments.
2396 // For info on fast calling convention see Fast Calling Convention (tail call)
2397 // implementation LowerX86_32FastCCCallTo.
2399 /// CallIsStructReturn - Determines whether a call uses struct return
2401 enum StructReturnType {
2406 static StructReturnType
2407 callIsStructReturn(const SmallVectorImpl<ISD::OutputArg> &Outs) {
2409 return NotStructReturn;
2411 const ISD::ArgFlagsTy &Flags = Outs[0].Flags;
2412 if (!Flags.isSRet())
2413 return NotStructReturn;
2414 if (Flags.isInReg())
2415 return RegStructReturn;
2416 return StackStructReturn;
2419 /// Determines whether a function uses struct return semantics.
2420 static StructReturnType
2421 argsAreStructReturn(const SmallVectorImpl<ISD::InputArg> &Ins) {
2423 return NotStructReturn;
2425 const ISD::ArgFlagsTy &Flags = Ins[0].Flags;
2426 if (!Flags.isSRet())
2427 return NotStructReturn;
2428 if (Flags.isInReg())
2429 return RegStructReturn;
2430 return StackStructReturn;
2433 /// Make a copy of an aggregate at address specified by "Src" to address
2434 /// "Dst" with size and alignment information specified by the specific
2435 /// parameter attribute. The copy will be passed as a byval function parameter.
2437 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
2438 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
2440 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), dl, MVT::i32);
2442 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
2443 /*isVolatile*/false, /*AlwaysInline=*/true,
2444 /*isTailCall*/false,
2445 MachinePointerInfo(), MachinePointerInfo());
2448 /// Return true if the calling convention is one that we can guarantee TCO for.
2449 static bool canGuaranteeTCO(CallingConv::ID CC) {
2450 return (CC == CallingConv::Fast || CC == CallingConv::GHC ||
2451 CC == CallingConv::HiPE || CC == CallingConv::HHVM);
2454 /// Return true if we might ever do TCO for calls with this calling convention.
2455 static bool mayTailCallThisCC(CallingConv::ID CC) {
2457 // C calling conventions:
2458 case CallingConv::C:
2459 case CallingConv::X86_64_Win64:
2460 case CallingConv::X86_64_SysV:
2461 // Callee pop conventions:
2462 case CallingConv::X86_ThisCall:
2463 case CallingConv::X86_StdCall:
2464 case CallingConv::X86_VectorCall:
2465 case CallingConv::X86_FastCall:
2468 return canGuaranteeTCO(CC);
2472 /// Return true if the function is being made into a tailcall target by
2473 /// changing its ABI.
2474 static bool shouldGuaranteeTCO(CallingConv::ID CC, bool GuaranteedTailCallOpt) {
2475 return GuaranteedTailCallOpt && canGuaranteeTCO(CC);
2478 bool X86TargetLowering::mayBeEmittedAsTailCall(CallInst *CI) const {
2480 CI->getParent()->getParent()->getFnAttribute("disable-tail-calls");
2481 if (!CI->isTailCall() || Attr.getValueAsString() == "true")
2485 CallingConv::ID CalleeCC = CS.getCallingConv();
2486 if (!mayTailCallThisCC(CalleeCC))
2493 X86TargetLowering::LowerMemArgument(SDValue Chain,
2494 CallingConv::ID CallConv,
2495 const SmallVectorImpl<ISD::InputArg> &Ins,
2496 SDLoc dl, SelectionDAG &DAG,
2497 const CCValAssign &VA,
2498 MachineFrameInfo *MFI,
2500 // Create the nodes corresponding to a load from this parameter slot.
2501 ISD::ArgFlagsTy Flags = Ins[i].Flags;
2502 bool AlwaysUseMutable = shouldGuaranteeTCO(
2503 CallConv, DAG.getTarget().Options.GuaranteedTailCallOpt);
2504 bool isImmutable = !AlwaysUseMutable && !Flags.isByVal();
2507 // If value is passed by pointer we have address passed instead of the value
2509 bool ExtendedInMem = VA.isExtInLoc() &&
2510 VA.getValVT().getScalarType() == MVT::i1;
2512 if (VA.getLocInfo() == CCValAssign::Indirect || ExtendedInMem)
2513 ValVT = VA.getLocVT();
2515 ValVT = VA.getValVT();
2517 // FIXME: For now, all byval parameter objects are marked mutable. This can be
2518 // changed with more analysis.
2519 // In case of tail call optimization mark all arguments mutable. Since they
2520 // could be overwritten by lowering of arguments in case of a tail call.
2521 if (Flags.isByVal()) {
2522 unsigned Bytes = Flags.getByValSize();
2523 if (Bytes == 0) Bytes = 1; // Don't create zero-sized stack objects.
2524 int FI = MFI->CreateFixedObject(Bytes, VA.getLocMemOffset(), isImmutable);
2525 return DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
2527 int FI = MFI->CreateFixedObject(ValVT.getSizeInBits()/8,
2528 VA.getLocMemOffset(), isImmutable);
2529 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
2530 SDValue Val = DAG.getLoad(
2531 ValVT, dl, Chain, FIN,
2532 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI), false,
2534 return ExtendedInMem ?
2535 DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), Val) : Val;
2539 // FIXME: Get this from tablegen.
2540 static ArrayRef<MCPhysReg> get64BitArgumentGPRs(CallingConv::ID CallConv,
2541 const X86Subtarget *Subtarget) {
2542 assert(Subtarget->is64Bit());
2544 if (Subtarget->isCallingConvWin64(CallConv)) {
2545 static const MCPhysReg GPR64ArgRegsWin64[] = {
2546 X86::RCX, X86::RDX, X86::R8, X86::R9
2548 return makeArrayRef(std::begin(GPR64ArgRegsWin64), std::end(GPR64ArgRegsWin64));
2551 static const MCPhysReg GPR64ArgRegs64Bit[] = {
2552 X86::RDI, X86::RSI, X86::RDX, X86::RCX, X86::R8, X86::R9
2554 return makeArrayRef(std::begin(GPR64ArgRegs64Bit), std::end(GPR64ArgRegs64Bit));
2557 // FIXME: Get this from tablegen.
2558 static ArrayRef<MCPhysReg> get64BitArgumentXMMs(MachineFunction &MF,
2559 CallingConv::ID CallConv,
2560 const X86Subtarget *Subtarget) {
2561 assert(Subtarget->is64Bit());
2562 if (Subtarget->isCallingConvWin64(CallConv)) {
2563 // The XMM registers which might contain var arg parameters are shadowed
2564 // in their paired GPR. So we only need to save the GPR to their home
2566 // TODO: __vectorcall will change this.
2570 const Function *Fn = MF.getFunction();
2571 bool NoImplicitFloatOps = Fn->hasFnAttribute(Attribute::NoImplicitFloat);
2572 bool isSoftFloat = Subtarget->useSoftFloat();
2573 assert(!(isSoftFloat && NoImplicitFloatOps) &&
2574 "SSE register cannot be used when SSE is disabled!");
2575 if (isSoftFloat || NoImplicitFloatOps || !Subtarget->hasSSE1())
2576 // Kernel mode asks for SSE to be disabled, so there are no XMM argument
2580 static const MCPhysReg XMMArgRegs64Bit[] = {
2581 X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
2582 X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
2584 return makeArrayRef(std::begin(XMMArgRegs64Bit), std::end(XMMArgRegs64Bit));
2587 SDValue X86TargetLowering::LowerFormalArguments(
2588 SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
2589 const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc dl, SelectionDAG &DAG,
2590 SmallVectorImpl<SDValue> &InVals) const {
2591 MachineFunction &MF = DAG.getMachineFunction();
2592 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
2593 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
2595 const Function* Fn = MF.getFunction();
2596 if (Fn->hasExternalLinkage() &&
2597 Subtarget->isTargetCygMing() &&
2598 Fn->getName() == "main")
2599 FuncInfo->setForceFramePointer(true);
2601 MachineFrameInfo *MFI = MF.getFrameInfo();
2602 bool Is64Bit = Subtarget->is64Bit();
2603 bool IsWin64 = Subtarget->isCallingConvWin64(CallConv);
2605 assert(!(isVarArg && canGuaranteeTCO(CallConv)) &&
2606 "Var args not supported with calling convention fastcc, ghc or hipe");
2608 // Assign locations to all of the incoming arguments.
2609 SmallVector<CCValAssign, 16> ArgLocs;
2610 CCState CCInfo(CallConv, isVarArg, MF, ArgLocs, *DAG.getContext());
2612 // Allocate shadow area for Win64
2614 CCInfo.AllocateStack(32, 8);
2616 CCInfo.AnalyzeFormalArguments(Ins, CC_X86);
2618 unsigned LastVal = ~0U;
2620 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
2621 CCValAssign &VA = ArgLocs[i];
2622 // TODO: If an arg is passed in two places (e.g. reg and stack), skip later
2624 assert(VA.getValNo() != LastVal &&
2625 "Don't support value assigned to multiple locs yet");
2627 LastVal = VA.getValNo();
2629 if (VA.isRegLoc()) {
2630 EVT RegVT = VA.getLocVT();
2631 const TargetRegisterClass *RC;
2632 if (RegVT == MVT::i32)
2633 RC = &X86::GR32RegClass;
2634 else if (Is64Bit && RegVT == MVT::i64)
2635 RC = &X86::GR64RegClass;
2636 else if (RegVT == MVT::f32)
2637 RC = &X86::FR32RegClass;
2638 else if (RegVT == MVT::f64)
2639 RC = &X86::FR64RegClass;
2640 else if (RegVT.is512BitVector())
2641 RC = &X86::VR512RegClass;
2642 else if (RegVT.is256BitVector())
2643 RC = &X86::VR256RegClass;
2644 else if (RegVT.is128BitVector())
2645 RC = &X86::VR128RegClass;
2646 else if (RegVT == MVT::x86mmx)
2647 RC = &X86::VR64RegClass;
2648 else if (RegVT == MVT::i1)
2649 RC = &X86::VK1RegClass;
2650 else if (RegVT == MVT::v8i1)
2651 RC = &X86::VK8RegClass;
2652 else if (RegVT == MVT::v16i1)
2653 RC = &X86::VK16RegClass;
2654 else if (RegVT == MVT::v32i1)
2655 RC = &X86::VK32RegClass;
2656 else if (RegVT == MVT::v64i1)
2657 RC = &X86::VK64RegClass;
2659 llvm_unreachable("Unknown argument type!");
2661 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
2662 ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
2664 // If this is an 8 or 16-bit value, it is really passed promoted to 32
2665 // bits. Insert an assert[sz]ext to capture this, then truncate to the
2667 if (VA.getLocInfo() == CCValAssign::SExt)
2668 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
2669 DAG.getValueType(VA.getValVT()));
2670 else if (VA.getLocInfo() == CCValAssign::ZExt)
2671 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
2672 DAG.getValueType(VA.getValVT()));
2673 else if (VA.getLocInfo() == CCValAssign::BCvt)
2674 ArgValue = DAG.getBitcast(VA.getValVT(), ArgValue);
2676 if (VA.isExtInLoc()) {
2677 // Handle MMX values passed in XMM regs.
2678 if (RegVT.isVector() && VA.getValVT().getScalarType() != MVT::i1)
2679 ArgValue = DAG.getNode(X86ISD::MOVDQ2Q, dl, VA.getValVT(), ArgValue);
2681 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
2684 assert(VA.isMemLoc());
2685 ArgValue = LowerMemArgument(Chain, CallConv, Ins, dl, DAG, VA, MFI, i);
2688 // If value is passed via pointer - do a load.
2689 if (VA.getLocInfo() == CCValAssign::Indirect)
2690 ArgValue = DAG.getLoad(VA.getValVT(), dl, Chain, ArgValue,
2691 MachinePointerInfo(), false, false, false, 0);
2693 InVals.push_back(ArgValue);
2696 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
2697 // All x86 ABIs require that for returning structs by value we copy the
2698 // sret argument into %rax/%eax (depending on ABI) for the return. Save
2699 // the argument into a virtual register so that we can access it from the
2701 if (Ins[i].Flags.isSRet()) {
2702 unsigned Reg = FuncInfo->getSRetReturnReg();
2704 MVT PtrTy = getPointerTy(DAG.getDataLayout());
2705 Reg = MF.getRegInfo().createVirtualRegister(getRegClassFor(PtrTy));
2706 FuncInfo->setSRetReturnReg(Reg);
2708 SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[i]);
2709 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain);
2714 unsigned StackSize = CCInfo.getNextStackOffset();
2715 // Align stack specially for tail calls.
2716 if (shouldGuaranteeTCO(CallConv,
2717 MF.getTarget().Options.GuaranteedTailCallOpt))
2718 StackSize = GetAlignedArgumentStackSize(StackSize, DAG);
2720 // If the function takes variable number of arguments, make a frame index for
2721 // the start of the first vararg value... for expansion of llvm.va_start. We
2722 // can skip this if there are no va_start calls.
2723 if (MFI->hasVAStart() &&
2724 (Is64Bit || (CallConv != CallingConv::X86_FastCall &&
2725 CallConv != CallingConv::X86_ThisCall))) {
2726 FuncInfo->setVarArgsFrameIndex(
2727 MFI->CreateFixedObject(1, StackSize, true));
2730 // Figure out if XMM registers are in use.
2731 assert(!(Subtarget->useSoftFloat() &&
2732 Fn->hasFnAttribute(Attribute::NoImplicitFloat)) &&
2733 "SSE register cannot be used when SSE is disabled!");
2735 // 64-bit calling conventions support varargs and register parameters, so we
2736 // have to do extra work to spill them in the prologue.
2737 if (Is64Bit && isVarArg && MFI->hasVAStart()) {
2738 // Find the first unallocated argument registers.
2739 ArrayRef<MCPhysReg> ArgGPRs = get64BitArgumentGPRs(CallConv, Subtarget);
2740 ArrayRef<MCPhysReg> ArgXMMs = get64BitArgumentXMMs(MF, CallConv, Subtarget);
2741 unsigned NumIntRegs = CCInfo.getFirstUnallocated(ArgGPRs);
2742 unsigned NumXMMRegs = CCInfo.getFirstUnallocated(ArgXMMs);
2743 assert(!(NumXMMRegs && !Subtarget->hasSSE1()) &&
2744 "SSE register cannot be used when SSE is disabled!");
2746 // Gather all the live in physical registers.
2747 SmallVector<SDValue, 6> LiveGPRs;
2748 SmallVector<SDValue, 8> LiveXMMRegs;
2750 for (MCPhysReg Reg : ArgGPRs.slice(NumIntRegs)) {
2751 unsigned GPR = MF.addLiveIn(Reg, &X86::GR64RegClass);
2753 DAG.getCopyFromReg(Chain, dl, GPR, MVT::i64));
2755 if (!ArgXMMs.empty()) {
2756 unsigned AL = MF.addLiveIn(X86::AL, &X86::GR8RegClass);
2757 ALVal = DAG.getCopyFromReg(Chain, dl, AL, MVT::i8);
2758 for (MCPhysReg Reg : ArgXMMs.slice(NumXMMRegs)) {
2759 unsigned XMMReg = MF.addLiveIn(Reg, &X86::VR128RegClass);
2760 LiveXMMRegs.push_back(
2761 DAG.getCopyFromReg(Chain, dl, XMMReg, MVT::v4f32));
2766 // Get to the caller-allocated home save location. Add 8 to account
2767 // for the return address.
2768 int HomeOffset = TFI.getOffsetOfLocalArea() + 8;
2769 FuncInfo->setRegSaveFrameIndex(
2770 MFI->CreateFixedObject(1, NumIntRegs * 8 + HomeOffset, false));
2771 // Fixup to set vararg frame on shadow area (4 x i64).
2773 FuncInfo->setVarArgsFrameIndex(FuncInfo->getRegSaveFrameIndex());
2775 // For X86-64, if there are vararg parameters that are passed via
2776 // registers, then we must store them to their spots on the stack so
2777 // they may be loaded by deferencing the result of va_next.
2778 FuncInfo->setVarArgsGPOffset(NumIntRegs * 8);
2779 FuncInfo->setVarArgsFPOffset(ArgGPRs.size() * 8 + NumXMMRegs * 16);
2780 FuncInfo->setRegSaveFrameIndex(MFI->CreateStackObject(
2781 ArgGPRs.size() * 8 + ArgXMMs.size() * 16, 16, false));
2784 // Store the integer parameter registers.
2785 SmallVector<SDValue, 8> MemOps;
2786 SDValue RSFIN = DAG.getFrameIndex(FuncInfo->getRegSaveFrameIndex(),
2787 getPointerTy(DAG.getDataLayout()));
2788 unsigned Offset = FuncInfo->getVarArgsGPOffset();
2789 for (SDValue Val : LiveGPRs) {
2790 SDValue FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(DAG.getDataLayout()),
2791 RSFIN, DAG.getIntPtrConstant(Offset, dl));
2793 DAG.getStore(Val.getValue(1), dl, Val, FIN,
2794 MachinePointerInfo::getFixedStack(
2795 DAG.getMachineFunction(),
2796 FuncInfo->getRegSaveFrameIndex(), Offset),
2798 MemOps.push_back(Store);
2802 if (!ArgXMMs.empty() && NumXMMRegs != ArgXMMs.size()) {
2803 // Now store the XMM (fp + vector) parameter registers.
2804 SmallVector<SDValue, 12> SaveXMMOps;
2805 SaveXMMOps.push_back(Chain);
2806 SaveXMMOps.push_back(ALVal);
2807 SaveXMMOps.push_back(DAG.getIntPtrConstant(
2808 FuncInfo->getRegSaveFrameIndex(), dl));
2809 SaveXMMOps.push_back(DAG.getIntPtrConstant(
2810 FuncInfo->getVarArgsFPOffset(), dl));
2811 SaveXMMOps.insert(SaveXMMOps.end(), LiveXMMRegs.begin(),
2813 MemOps.push_back(DAG.getNode(X86ISD::VASTART_SAVE_XMM_REGS, dl,
2814 MVT::Other, SaveXMMOps));
2817 if (!MemOps.empty())
2818 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOps);
2821 if (isVarArg && MFI->hasMustTailInVarArgFunc()) {
2822 // Find the largest legal vector type.
2823 MVT VecVT = MVT::Other;
2824 // FIXME: Only some x86_32 calling conventions support AVX512.
2825 if (Subtarget->hasAVX512() &&
2826 (Is64Bit || (CallConv == CallingConv::X86_VectorCall ||
2827 CallConv == CallingConv::Intel_OCL_BI)))
2828 VecVT = MVT::v16f32;
2829 else if (Subtarget->hasAVX())
2831 else if (Subtarget->hasSSE2())
2834 // We forward some GPRs and some vector types.
2835 SmallVector<MVT, 2> RegParmTypes;
2836 MVT IntVT = Is64Bit ? MVT::i64 : MVT::i32;
2837 RegParmTypes.push_back(IntVT);
2838 if (VecVT != MVT::Other)
2839 RegParmTypes.push_back(VecVT);
2841 // Compute the set of forwarded registers. The rest are scratch.
2842 SmallVectorImpl<ForwardedRegister> &Forwards =
2843 FuncInfo->getForwardedMustTailRegParms();
2844 CCInfo.analyzeMustTailForwardedRegisters(Forwards, RegParmTypes, CC_X86);
2846 // Conservatively forward AL on x86_64, since it might be used for varargs.
2847 if (Is64Bit && !CCInfo.isAllocated(X86::AL)) {
2848 unsigned ALVReg = MF.addLiveIn(X86::AL, &X86::GR8RegClass);
2849 Forwards.push_back(ForwardedRegister(ALVReg, X86::AL, MVT::i8));
2852 // Copy all forwards from physical to virtual registers.
2853 for (ForwardedRegister &F : Forwards) {
2854 // FIXME: Can we use a less constrained schedule?
2855 SDValue RegVal = DAG.getCopyFromReg(Chain, dl, F.VReg, F.VT);
2856 F.VReg = MF.getRegInfo().createVirtualRegister(getRegClassFor(F.VT));
2857 Chain = DAG.getCopyToReg(Chain, dl, F.VReg, RegVal);
2861 // Some CCs need callee pop.
2862 if (X86::isCalleePop(CallConv, Is64Bit, isVarArg,
2863 MF.getTarget().Options.GuaranteedTailCallOpt)) {
2864 FuncInfo->setBytesToPopOnReturn(StackSize); // Callee pops everything.
2866 FuncInfo->setBytesToPopOnReturn(0); // Callee pops nothing.
2867 // If this is an sret function, the return should pop the hidden pointer.
2868 if (!Is64Bit && !canGuaranteeTCO(CallConv) &&
2869 !Subtarget->getTargetTriple().isOSMSVCRT() &&
2870 argsAreStructReturn(Ins) == StackStructReturn)
2871 FuncInfo->setBytesToPopOnReturn(4);
2875 // RegSaveFrameIndex is X86-64 only.
2876 FuncInfo->setRegSaveFrameIndex(0xAAAAAAA);
2877 if (CallConv == CallingConv::X86_FastCall ||
2878 CallConv == CallingConv::X86_ThisCall)
2879 // fastcc functions can't have varargs.
2880 FuncInfo->setVarArgsFrameIndex(0xAAAAAAA);
2883 FuncInfo->setArgumentStackSize(StackSize);
2885 if (WinEHFuncInfo *EHInfo = MF.getWinEHFuncInfo()) {
2886 EHPersonality Personality = classifyEHPersonality(Fn->getPersonalityFn());
2887 if (Personality == EHPersonality::CoreCLR) {
2889 // TODO: Add a mechanism to frame lowering that will allow us to indicate
2890 // that we'd prefer this slot be allocated towards the bottom of the frame
2891 // (i.e. near the stack pointer after allocating the frame). Every
2892 // funclet needs a copy of this slot in its (mostly empty) frame, and the
2893 // offset from the bottom of this and each funclet's frame must be the
2894 // same, so the size of funclets' (mostly empty) frames is dictated by
2895 // how far this slot is from the bottom (since they allocate just enough
2896 // space to accomodate holding this slot at the correct offset).
2897 int PSPSymFI = MFI->CreateStackObject(8, 8, /*isSS=*/false);
2898 EHInfo->PSPSymFrameIdx = PSPSymFI;
2906 X86TargetLowering::LowerMemOpCallTo(SDValue Chain,
2907 SDValue StackPtr, SDValue Arg,
2908 SDLoc dl, SelectionDAG &DAG,
2909 const CCValAssign &VA,
2910 ISD::ArgFlagsTy Flags) const {
2911 unsigned LocMemOffset = VA.getLocMemOffset();
2912 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset, dl);
2913 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(DAG.getDataLayout()),
2915 if (Flags.isByVal())
2916 return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG, dl);
2918 return DAG.getStore(
2919 Chain, dl, Arg, PtrOff,
2920 MachinePointerInfo::getStack(DAG.getMachineFunction(), LocMemOffset),
2924 /// Emit a load of return address if tail call
2925 /// optimization is performed and it is required.
2927 X86TargetLowering::EmitTailCallLoadRetAddr(SelectionDAG &DAG,
2928 SDValue &OutRetAddr, SDValue Chain,
2929 bool IsTailCall, bool Is64Bit,
2930 int FPDiff, SDLoc dl) const {
2931 // Adjust the Return address stack slot.
2932 EVT VT = getPointerTy(DAG.getDataLayout());
2933 OutRetAddr = getReturnAddressFrameIndex(DAG);
2935 // Load the "old" Return address.
2936 OutRetAddr = DAG.getLoad(VT, dl, Chain, OutRetAddr, MachinePointerInfo(),
2937 false, false, false, 0);
2938 return SDValue(OutRetAddr.getNode(), 1);
2941 /// Emit a store of the return address if tail call
2942 /// optimization is performed and it is required (FPDiff!=0).
2943 static SDValue EmitTailCallStoreRetAddr(SelectionDAG &DAG, MachineFunction &MF,
2944 SDValue Chain, SDValue RetAddrFrIdx,
2945 EVT PtrVT, unsigned SlotSize,
2946 int FPDiff, SDLoc dl) {
2947 // Store the return address to the appropriate stack slot.
2948 if (!FPDiff) return Chain;
2949 // Calculate the new stack slot for the return address.
2950 int NewReturnAddrFI =
2951 MF.getFrameInfo()->CreateFixedObject(SlotSize, (int64_t)FPDiff - SlotSize,
2953 SDValue NewRetAddrFrIdx = DAG.getFrameIndex(NewReturnAddrFI, PtrVT);
2954 Chain = DAG.getStore(Chain, dl, RetAddrFrIdx, NewRetAddrFrIdx,
2955 MachinePointerInfo::getFixedStack(
2956 DAG.getMachineFunction(), NewReturnAddrFI),
2961 /// Returns a vector_shuffle mask for an movs{s|d}, movd
2962 /// operation of specified width.
2963 static SDValue getMOVL(SelectionDAG &DAG, SDLoc dl, MVT VT, SDValue V1,
2965 unsigned NumElems = VT.getVectorNumElements();
2966 SmallVector<int, 8> Mask;
2967 Mask.push_back(NumElems);
2968 for (unsigned i = 1; i != NumElems; ++i)
2970 return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
2974 X86TargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
2975 SmallVectorImpl<SDValue> &InVals) const {
2976 SelectionDAG &DAG = CLI.DAG;
2978 SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
2979 SmallVectorImpl<SDValue> &OutVals = CLI.OutVals;
2980 SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins;
2981 SDValue Chain = CLI.Chain;
2982 SDValue Callee = CLI.Callee;
2983 CallingConv::ID CallConv = CLI.CallConv;
2984 bool &isTailCall = CLI.IsTailCall;
2985 bool isVarArg = CLI.IsVarArg;
2987 MachineFunction &MF = DAG.getMachineFunction();
2988 bool Is64Bit = Subtarget->is64Bit();
2989 bool IsWin64 = Subtarget->isCallingConvWin64(CallConv);
2990 StructReturnType SR = callIsStructReturn(Outs);
2991 bool IsSibcall = false;
2992 X86MachineFunctionInfo *X86Info = MF.getInfo<X86MachineFunctionInfo>();
2993 auto Attr = MF.getFunction()->getFnAttribute("disable-tail-calls");
2995 if (Attr.getValueAsString() == "true")
2998 if (Subtarget->isPICStyleGOT() &&
2999 !MF.getTarget().Options.GuaranteedTailCallOpt) {
3000 // If we are using a GOT, disable tail calls to external symbols with
3001 // default visibility. Tail calling such a symbol requires using a GOT
3002 // relocation, which forces early binding of the symbol. This breaks code
3003 // that require lazy function symbol resolution. Using musttail or
3004 // GuaranteedTailCallOpt will override this.
3005 GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee);
3006 if (!G || (!G->getGlobal()->hasLocalLinkage() &&
3007 G->getGlobal()->hasDefaultVisibility()))
3011 bool IsMustTail = CLI.CS && CLI.CS->isMustTailCall();
3013 // Force this to be a tail call. The verifier rules are enough to ensure
3014 // that we can lower this successfully without moving the return address
3017 } else if (isTailCall) {
3018 // Check if it's really possible to do a tail call.
3019 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
3020 isVarArg, SR != NotStructReturn,
3021 MF.getFunction()->hasStructRetAttr(), CLI.RetTy,
3022 Outs, OutVals, Ins, DAG);
3024 // Sibcalls are automatically detected tailcalls which do not require
3026 if (!MF.getTarget().Options.GuaranteedTailCallOpt && isTailCall)
3033 assert(!(isVarArg && canGuaranteeTCO(CallConv)) &&
3034 "Var args not supported with calling convention fastcc, ghc or hipe");
3036 // Analyze operands of the call, assigning locations to each operand.
3037 SmallVector<CCValAssign, 16> ArgLocs;
3038 CCState CCInfo(CallConv, isVarArg, MF, ArgLocs, *DAG.getContext());
3040 // Allocate shadow area for Win64
3042 CCInfo.AllocateStack(32, 8);
3044 CCInfo.AnalyzeCallOperands(Outs, CC_X86);
3046 // Get a count of how many bytes are to be pushed on the stack.
3047 unsigned NumBytes = CCInfo.getAlignedCallFrameSize();
3049 // This is a sibcall. The memory operands are available in caller's
3050 // own caller's stack.
3052 else if (MF.getTarget().Options.GuaranteedTailCallOpt &&
3053 canGuaranteeTCO(CallConv))
3054 NumBytes = GetAlignedArgumentStackSize(NumBytes, DAG);
3057 if (isTailCall && !IsSibcall && !IsMustTail) {
3058 // Lower arguments at fp - stackoffset + fpdiff.
3059 unsigned NumBytesCallerPushed = X86Info->getBytesToPopOnReturn();
3061 FPDiff = NumBytesCallerPushed - NumBytes;
3063 // Set the delta of movement of the returnaddr stackslot.
3064 // But only set if delta is greater than previous delta.
3065 if (FPDiff < X86Info->getTCReturnAddrDelta())
3066 X86Info->setTCReturnAddrDelta(FPDiff);
3069 unsigned NumBytesToPush = NumBytes;
3070 unsigned NumBytesToPop = NumBytes;
3072 // If we have an inalloca argument, all stack space has already been allocated
3073 // for us and be right at the top of the stack. We don't support multiple
3074 // arguments passed in memory when using inalloca.
3075 if (!Outs.empty() && Outs.back().Flags.isInAlloca()) {
3077 if (!ArgLocs.back().isMemLoc())
3078 report_fatal_error("cannot use inalloca attribute on a register "
3080 if (ArgLocs.back().getLocMemOffset() != 0)
3081 report_fatal_error("any parameter with the inalloca attribute must be "
3082 "the only memory argument");
3086 Chain = DAG.getCALLSEQ_START(
3087 Chain, DAG.getIntPtrConstant(NumBytesToPush, dl, true), dl);
3089 SDValue RetAddrFrIdx;
3090 // Load return address for tail calls.
3091 if (isTailCall && FPDiff)
3092 Chain = EmitTailCallLoadRetAddr(DAG, RetAddrFrIdx, Chain, isTailCall,
3093 Is64Bit, FPDiff, dl);
3095 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
3096 SmallVector<SDValue, 8> MemOpChains;
3099 // Walk the register/memloc assignments, inserting copies/loads. In the case
3100 // of tail call optimization arguments are handle later.
3101 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3102 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
3103 // Skip inalloca arguments, they have already been written.
3104 ISD::ArgFlagsTy Flags = Outs[i].Flags;
3105 if (Flags.isInAlloca())
3108 CCValAssign &VA = ArgLocs[i];
3109 EVT RegVT = VA.getLocVT();
3110 SDValue Arg = OutVals[i];
3111 bool isByVal = Flags.isByVal();
3113 // Promote the value if needed.
3114 switch (VA.getLocInfo()) {
3115 default: llvm_unreachable("Unknown loc info!");
3116 case CCValAssign::Full: break;
3117 case CCValAssign::SExt:
3118 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, RegVT, Arg);
3120 case CCValAssign::ZExt:
3121 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, RegVT, Arg);
3123 case CCValAssign::AExt:
3124 if (Arg.getValueType().isVector() &&
3125 Arg.getValueType().getVectorElementType() == MVT::i1)
3126 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, RegVT, Arg);
3127 else if (RegVT.is128BitVector()) {
3128 // Special case: passing MMX values in XMM registers.
3129 Arg = DAG.getBitcast(MVT::i64, Arg);
3130 Arg = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64, Arg);
3131 Arg = getMOVL(DAG, dl, MVT::v2i64, DAG.getUNDEF(MVT::v2i64), Arg);
3133 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, RegVT, Arg);
3135 case CCValAssign::BCvt:
3136 Arg = DAG.getBitcast(RegVT, Arg);
3138 case CCValAssign::Indirect: {
3139 // Store the argument.
3140 SDValue SpillSlot = DAG.CreateStackTemporary(VA.getValVT());
3141 int FI = cast<FrameIndexSDNode>(SpillSlot)->getIndex();
3142 Chain = DAG.getStore(
3143 Chain, dl, Arg, SpillSlot,
3144 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI),
3151 if (VA.isRegLoc()) {
3152 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
3153 if (isVarArg && IsWin64) {
3154 // Win64 ABI requires argument XMM reg to be copied to the corresponding
3155 // shadow reg if callee is a varargs function.
3156 unsigned ShadowReg = 0;
3157 switch (VA.getLocReg()) {
3158 case X86::XMM0: ShadowReg = X86::RCX; break;
3159 case X86::XMM1: ShadowReg = X86::RDX; break;
3160 case X86::XMM2: ShadowReg = X86::R8; break;
3161 case X86::XMM3: ShadowReg = X86::R9; break;
3164 RegsToPass.push_back(std::make_pair(ShadowReg, Arg));
3166 } else if (!IsSibcall && (!isTailCall || isByVal)) {
3167 assert(VA.isMemLoc());
3168 if (!StackPtr.getNode())
3169 StackPtr = DAG.getCopyFromReg(Chain, dl, RegInfo->getStackRegister(),
3170 getPointerTy(DAG.getDataLayout()));
3171 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Arg,
3172 dl, DAG, VA, Flags));
3176 if (!MemOpChains.empty())
3177 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains);
3179 if (Subtarget->isPICStyleGOT()) {
3180 // ELF / PIC requires GOT in the EBX register before function calls via PLT
3183 RegsToPass.push_back(std::make_pair(
3184 unsigned(X86::EBX), DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(),
3185 getPointerTy(DAG.getDataLayout()))));
3187 // If we are tail calling and generating PIC/GOT style code load the
3188 // address of the callee into ECX. The value in ecx is used as target of
3189 // the tail jump. This is done to circumvent the ebx/callee-saved problem
3190 // for tail calls on PIC/GOT architectures. Normally we would just put the
3191 // address of GOT into ebx and then call target@PLT. But for tail calls
3192 // ebx would be restored (since ebx is callee saved) before jumping to the
3195 // Note: The actual moving to ECX is done further down.
3196 GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee);
3197 if (G && !G->getGlobal()->hasLocalLinkage() &&
3198 G->getGlobal()->hasDefaultVisibility())
3199 Callee = LowerGlobalAddress(Callee, DAG);
3200 else if (isa<ExternalSymbolSDNode>(Callee))
3201 Callee = LowerExternalSymbol(Callee, DAG);
3205 if (Is64Bit && isVarArg && !IsWin64 && !IsMustTail) {
3206 // From AMD64 ABI document:
3207 // For calls that may call functions that use varargs or stdargs
3208 // (prototype-less calls or calls to functions containing ellipsis (...) in
3209 // the declaration) %al is used as hidden argument to specify the number
3210 // of SSE registers used. The contents of %al do not need to match exactly
3211 // the number of registers, but must be an ubound on the number of SSE
3212 // registers used and is in the range 0 - 8 inclusive.
3214 // Count the number of XMM registers allocated.
3215 static const MCPhysReg XMMArgRegs[] = {
3216 X86::XMM0, X86::XMM1, X86::XMM2, X86::XMM3,
3217 X86::XMM4, X86::XMM5, X86::XMM6, X86::XMM7
3219 unsigned NumXMMRegs = CCInfo.getFirstUnallocated(XMMArgRegs);
3220 assert((Subtarget->hasSSE1() || !NumXMMRegs)
3221 && "SSE registers cannot be used when SSE is disabled");
3223 RegsToPass.push_back(std::make_pair(unsigned(X86::AL),
3224 DAG.getConstant(NumXMMRegs, dl,
3228 if (isVarArg && IsMustTail) {
3229 const auto &Forwards = X86Info->getForwardedMustTailRegParms();
3230 for (const auto &F : Forwards) {
3231 SDValue Val = DAG.getCopyFromReg(Chain, dl, F.VReg, F.VT);
3232 RegsToPass.push_back(std::make_pair(unsigned(F.PReg), Val));
3236 // For tail calls lower the arguments to the 'real' stack slots. Sibcalls
3237 // don't need this because the eligibility check rejects calls that require
3238 // shuffling arguments passed in memory.
3239 if (!IsSibcall && isTailCall) {
3240 // Force all the incoming stack arguments to be loaded from the stack
3241 // before any new outgoing arguments are stored to the stack, because the
3242 // outgoing stack slots may alias the incoming argument stack slots, and
3243 // the alias isn't otherwise explicit. This is slightly more conservative
3244 // than necessary, because it means that each store effectively depends
3245 // on every argument instead of just those arguments it would clobber.
3246 SDValue ArgChain = DAG.getStackArgumentTokenFactor(Chain);
3248 SmallVector<SDValue, 8> MemOpChains2;
3251 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
3252 CCValAssign &VA = ArgLocs[i];
3255 assert(VA.isMemLoc());
3256 SDValue Arg = OutVals[i];
3257 ISD::ArgFlagsTy Flags = Outs[i].Flags;
3258 // Skip inalloca arguments. They don't require any work.
3259 if (Flags.isInAlloca())
3261 // Create frame index.
3262 int32_t Offset = VA.getLocMemOffset()+FPDiff;
3263 uint32_t OpSize = (VA.getLocVT().getSizeInBits()+7)/8;
3264 FI = MF.getFrameInfo()->CreateFixedObject(OpSize, Offset, true);
3265 FIN = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
3267 if (Flags.isByVal()) {
3268 // Copy relative to framepointer.
3269 SDValue Source = DAG.getIntPtrConstant(VA.getLocMemOffset(), dl);
3270 if (!StackPtr.getNode())
3271 StackPtr = DAG.getCopyFromReg(Chain, dl, RegInfo->getStackRegister(),
3272 getPointerTy(DAG.getDataLayout()));
3273 Source = DAG.getNode(ISD::ADD, dl, getPointerTy(DAG.getDataLayout()),
3276 MemOpChains2.push_back(CreateCopyOfByValArgument(Source, FIN,
3280 // Store relative to framepointer.
3281 MemOpChains2.push_back(DAG.getStore(
3282 ArgChain, dl, Arg, FIN,
3283 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI),
3288 if (!MemOpChains2.empty())
3289 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains2);
3291 // Store the return address to the appropriate stack slot.
3292 Chain = EmitTailCallStoreRetAddr(DAG, MF, Chain, RetAddrFrIdx,
3293 getPointerTy(DAG.getDataLayout()),
3294 RegInfo->getSlotSize(), FPDiff, dl);
3297 // Build a sequence of copy-to-reg nodes chained together with token chain
3298 // and flag operands which copy the outgoing args into registers.
3300 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
3301 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
3302 RegsToPass[i].second, InFlag);
3303 InFlag = Chain.getValue(1);
3306 if (DAG.getTarget().getCodeModel() == CodeModel::Large) {
3307 assert(Is64Bit && "Large code model is only legal in 64-bit mode.");
3308 // In the 64-bit large code model, we have to make all calls
3309 // through a register, since the call instruction's 32-bit
3310 // pc-relative offset may not be large enough to hold the whole
3312 } else if (Callee->getOpcode() == ISD::GlobalAddress) {
3313 // If the callee is a GlobalAddress node (quite common, every direct call
3314 // is) turn it into a TargetGlobalAddress node so that legalize doesn't hack
3316 GlobalAddressSDNode* G = cast<GlobalAddressSDNode>(Callee);
3318 // We should use extra load for direct calls to dllimported functions in
3320 const GlobalValue *GV = G->getGlobal();
3321 if (!GV->hasDLLImportStorageClass()) {
3322 unsigned char OpFlags = 0;
3323 bool ExtraLoad = false;
3324 unsigned WrapperKind = ISD::DELETED_NODE;
3326 // On ELF targets, in both X86-64 and X86-32 mode, direct calls to
3327 // external symbols most go through the PLT in PIC mode. If the symbol
3328 // has hidden or protected visibility, or if it is static or local, then
3329 // we don't need to use the PLT - we can directly call it.
3330 if (Subtarget->isTargetELF() &&
3331 DAG.getTarget().getRelocationModel() == Reloc::PIC_ &&
3332 GV->hasDefaultVisibility() && !GV->hasLocalLinkage()) {
3333 OpFlags = X86II::MO_PLT;
3334 } else if (Subtarget->isPICStyleStubAny() &&
3335 !GV->isStrongDefinitionForLinker() &&
3336 (!Subtarget->getTargetTriple().isMacOSX() ||
3337 Subtarget->getTargetTriple().isMacOSXVersionLT(10, 5))) {
3338 // PC-relative references to external symbols should go through $stub,
3339 // unless we're building with the leopard linker or later, which
3340 // automatically synthesizes these stubs.
3341 OpFlags = X86II::MO_DARWIN_STUB;
3342 } else if (Subtarget->isPICStyleRIPRel() && isa<Function>(GV) &&
3343 cast<Function>(GV)->hasFnAttribute(Attribute::NonLazyBind)) {
3344 // If the function is marked as non-lazy, generate an indirect call
3345 // which loads from the GOT directly. This avoids runtime overhead
3346 // at the cost of eager binding (and one extra byte of encoding).
3347 OpFlags = X86II::MO_GOTPCREL;
3348 WrapperKind = X86ISD::WrapperRIP;
3352 Callee = DAG.getTargetGlobalAddress(
3353 GV, dl, getPointerTy(DAG.getDataLayout()), G->getOffset(), OpFlags);
3355 // Add a wrapper if needed.
3356 if (WrapperKind != ISD::DELETED_NODE)
3357 Callee = DAG.getNode(X86ISD::WrapperRIP, dl,
3358 getPointerTy(DAG.getDataLayout()), Callee);
3359 // Add extra indirection if needed.
3361 Callee = DAG.getLoad(
3362 getPointerTy(DAG.getDataLayout()), dl, DAG.getEntryNode(), Callee,
3363 MachinePointerInfo::getGOT(DAG.getMachineFunction()), false, false,
3366 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
3367 unsigned char OpFlags = 0;
3369 // On ELF targets, in either X86-64 or X86-32 mode, direct calls to
3370 // external symbols should go through the PLT.
3371 if (Subtarget->isTargetELF() &&
3372 DAG.getTarget().getRelocationModel() == Reloc::PIC_) {
3373 OpFlags = X86II::MO_PLT;
3374 } else if (Subtarget->isPICStyleStubAny() &&
3375 (!Subtarget->getTargetTriple().isMacOSX() ||
3376 Subtarget->getTargetTriple().isMacOSXVersionLT(10, 5))) {
3377 // PC-relative references to external symbols should go through $stub,
3378 // unless we're building with the leopard linker or later, which
3379 // automatically synthesizes these stubs.
3380 OpFlags = X86II::MO_DARWIN_STUB;
3383 Callee = DAG.getTargetExternalSymbol(
3384 S->getSymbol(), getPointerTy(DAG.getDataLayout()), OpFlags);
3385 } else if (Subtarget->isTarget64BitILP32() &&
3386 Callee->getValueType(0) == MVT::i32) {
3387 // Zero-extend the 32-bit Callee address into a 64-bit according to x32 ABI
3388 Callee = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i64, Callee);
3391 // Returns a chain & a flag for retval copy to use.
3392 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
3393 SmallVector<SDValue, 8> Ops;
3395 if (!IsSibcall && isTailCall) {
3396 Chain = DAG.getCALLSEQ_END(Chain,
3397 DAG.getIntPtrConstant(NumBytesToPop, dl, true),
3398 DAG.getIntPtrConstant(0, dl, true), InFlag, dl);
3399 InFlag = Chain.getValue(1);
3402 Ops.push_back(Chain);
3403 Ops.push_back(Callee);
3406 Ops.push_back(DAG.getConstant(FPDiff, dl, MVT::i32));
3408 // Add argument registers to the end of the list so that they are known live
3410 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
3411 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
3412 RegsToPass[i].second.getValueType()));
3414 // Add a register mask operand representing the call-preserved registers.
3415 const uint32_t *Mask = RegInfo->getCallPreservedMask(MF, CallConv);
3416 assert(Mask && "Missing call preserved mask for calling convention");
3418 // If this is an invoke in a 32-bit function using a funclet-based
3419 // personality, assume the function clobbers all registers. If an exception
3420 // is thrown, the runtime will not restore CSRs.
3421 // FIXME: Model this more precisely so that we can register allocate across
3422 // the normal edge and spill and fill across the exceptional edge.
3423 if (!Is64Bit && CLI.CS && CLI.CS->isInvoke()) {
3424 const Function *CallerFn = MF.getFunction();
3425 EHPersonality Pers =
3426 CallerFn->hasPersonalityFn()
3427 ? classifyEHPersonality(CallerFn->getPersonalityFn())
3428 : EHPersonality::Unknown;
3429 if (isFuncletEHPersonality(Pers))
3430 Mask = RegInfo->getNoPreservedMask();
3433 Ops.push_back(DAG.getRegisterMask(Mask));
3435 if (InFlag.getNode())
3436 Ops.push_back(InFlag);
3440 //// If this is the first return lowered for this function, add the regs
3441 //// to the liveout set for the function.
3442 // This isn't right, although it's probably harmless on x86; liveouts
3443 // should be computed from returns not tail calls. Consider a void
3444 // function making a tail call to a function returning int.
3445 MF.getFrameInfo()->setHasTailCall();
3446 return DAG.getNode(X86ISD::TC_RETURN, dl, NodeTys, Ops);
3449 Chain = DAG.getNode(X86ISD::CALL, dl, NodeTys, Ops);
3450 InFlag = Chain.getValue(1);
3452 // Create the CALLSEQ_END node.
3453 unsigned NumBytesForCalleeToPop;
3454 if (X86::isCalleePop(CallConv, Is64Bit, isVarArg,
3455 DAG.getTarget().Options.GuaranteedTailCallOpt))
3456 NumBytesForCalleeToPop = NumBytes; // Callee pops everything
3457 else if (!Is64Bit && !canGuaranteeTCO(CallConv) &&
3458 !Subtarget->getTargetTriple().isOSMSVCRT() &&
3459 SR == StackStructReturn)
3460 // If this is a call to a struct-return function, the callee
3461 // pops the hidden struct pointer, so we have to push it back.
3462 // This is common for Darwin/X86, Linux & Mingw32 targets.
3463 // For MSVC Win32 targets, the caller pops the hidden struct pointer.
3464 NumBytesForCalleeToPop = 4;
3466 NumBytesForCalleeToPop = 0; // Callee pops nothing.
3468 // Returns a flag for retval copy to use.
3470 Chain = DAG.getCALLSEQ_END(Chain,
3471 DAG.getIntPtrConstant(NumBytesToPop, dl, true),
3472 DAG.getIntPtrConstant(NumBytesForCalleeToPop, dl,
3475 InFlag = Chain.getValue(1);
3478 // Handle result values, copying them out of physregs into vregs that we
3480 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
3481 Ins, dl, DAG, InVals);
3484 //===----------------------------------------------------------------------===//
3485 // Fast Calling Convention (tail call) implementation
3486 //===----------------------------------------------------------------------===//
3488 // Like std call, callee cleans arguments, convention except that ECX is
3489 // reserved for storing the tail called function address. Only 2 registers are
3490 // free for argument passing (inreg). Tail call optimization is performed
3492 // * tailcallopt is enabled
3493 // * caller/callee are fastcc
3494 // On X86_64 architecture with GOT-style position independent code only local
3495 // (within module) calls are supported at the moment.
3496 // To keep the stack aligned according to platform abi the function
3497 // GetAlignedArgumentStackSize ensures that argument delta is always multiples
3498 // of stack alignment. (Dynamic linkers need this - darwin's dyld for example)
3499 // If a tail called function callee has more arguments than the caller the
3500 // caller needs to make sure that there is room to move the RETADDR to. This is
3501 // achieved by reserving an area the size of the argument delta right after the
3502 // original RETADDR, but before the saved framepointer or the spilled registers
3503 // e.g. caller(arg1, arg2) calls callee(arg1, arg2,arg3,arg4)
3515 /// Make the stack size align e.g 16n + 12 aligned for a 16-byte align
3518 X86TargetLowering::GetAlignedArgumentStackSize(unsigned StackSize,
3519 SelectionDAG& DAG) const {
3520 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3521 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
3522 unsigned StackAlignment = TFI.getStackAlignment();
3523 uint64_t AlignMask = StackAlignment - 1;
3524 int64_t Offset = StackSize;
3525 unsigned SlotSize = RegInfo->getSlotSize();
3526 if ( (Offset & AlignMask) <= (StackAlignment - SlotSize) ) {
3527 // Number smaller than 12 so just add the difference.
3528 Offset += ((StackAlignment - SlotSize) - (Offset & AlignMask));
3530 // Mask out lower bits, add stackalignment once plus the 12 bytes.
3531 Offset = ((~AlignMask) & Offset) + StackAlignment +
3532 (StackAlignment-SlotSize);
3537 /// Return true if the given stack call argument is already available in the
3538 /// same position (relatively) of the caller's incoming argument stack.
3540 bool MatchingStackOffset(SDValue Arg, unsigned Offset, ISD::ArgFlagsTy Flags,
3541 MachineFrameInfo *MFI, const MachineRegisterInfo *MRI,
3542 const X86InstrInfo *TII) {
3543 unsigned Bytes = Arg.getValueType().getSizeInBits() / 8;
3545 if (Arg.getOpcode() == ISD::CopyFromReg) {
3546 unsigned VR = cast<RegisterSDNode>(Arg.getOperand(1))->getReg();
3547 if (!TargetRegisterInfo::isVirtualRegister(VR))
3549 MachineInstr *Def = MRI->getVRegDef(VR);
3552 if (!Flags.isByVal()) {
3553 if (!TII->isLoadFromStackSlot(Def, FI))
3556 unsigned Opcode = Def->getOpcode();
3557 if ((Opcode == X86::LEA32r || Opcode == X86::LEA64r ||
3558 Opcode == X86::LEA64_32r) &&
3559 Def->getOperand(1).isFI()) {
3560 FI = Def->getOperand(1).getIndex();
3561 Bytes = Flags.getByValSize();
3565 } else if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Arg)) {
3566 if (Flags.isByVal())
3567 // ByVal argument is passed in as a pointer but it's now being
3568 // dereferenced. e.g.
3569 // define @foo(%struct.X* %A) {
3570 // tail call @bar(%struct.X* byval %A)
3573 SDValue Ptr = Ld->getBasePtr();
3574 FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr);
3577 FI = FINode->getIndex();
3578 } else if (Arg.getOpcode() == ISD::FrameIndex && Flags.isByVal()) {
3579 FrameIndexSDNode *FINode = cast<FrameIndexSDNode>(Arg);
3580 FI = FINode->getIndex();
3581 Bytes = Flags.getByValSize();
3585 assert(FI != INT_MAX);
3586 if (!MFI->isFixedObjectIndex(FI))
3588 return Offset == MFI->getObjectOffset(FI) && Bytes == MFI->getObjectSize(FI);
3591 /// Check whether the call is eligible for tail call optimization. Targets
3592 /// that want to do tail call optimization should implement this function.
3593 bool X86TargetLowering::IsEligibleForTailCallOptimization(
3594 SDValue Callee, CallingConv::ID CalleeCC, bool isVarArg,
3595 bool isCalleeStructRet, bool isCallerStructRet, Type *RetTy,
3596 const SmallVectorImpl<ISD::OutputArg> &Outs,
3597 const SmallVectorImpl<SDValue> &OutVals,
3598 const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG &DAG) const {
3599 if (!mayTailCallThisCC(CalleeCC))
3602 // If -tailcallopt is specified, make fastcc functions tail-callable.
3603 MachineFunction &MF = DAG.getMachineFunction();
3604 const Function *CallerF = MF.getFunction();
3606 // If the function return type is x86_fp80 and the callee return type is not,
3607 // then the FP_EXTEND of the call result is not a nop. It's not safe to
3608 // perform a tailcall optimization here.
3609 if (CallerF->getReturnType()->isX86_FP80Ty() && !RetTy->isX86_FP80Ty())
3612 CallingConv::ID CallerCC = CallerF->getCallingConv();
3613 bool CCMatch = CallerCC == CalleeCC;
3614 bool IsCalleeWin64 = Subtarget->isCallingConvWin64(CalleeCC);
3615 bool IsCallerWin64 = Subtarget->isCallingConvWin64(CallerCC);
3617 // Win64 functions have extra shadow space for argument homing. Don't do the
3618 // sibcall if the caller and callee have mismatched expectations for this
3620 if (IsCalleeWin64 != IsCallerWin64)
3623 if (DAG.getTarget().Options.GuaranteedTailCallOpt) {
3624 if (canGuaranteeTCO(CalleeCC) && CCMatch)
3629 // Look for obvious safe cases to perform tail call optimization that do not
3630 // require ABI changes. This is what gcc calls sibcall.
3632 // Can't do sibcall if stack needs to be dynamically re-aligned. PEI needs to
3633 // emit a special epilogue.
3634 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3635 if (RegInfo->needsStackRealignment(MF))
3638 // Also avoid sibcall optimization if either caller or callee uses struct
3639 // return semantics.
3640 if (isCalleeStructRet || isCallerStructRet)
3643 // Do not sibcall optimize vararg calls unless all arguments are passed via
3645 if (isVarArg && !Outs.empty()) {
3646 // Optimizing for varargs on Win64 is unlikely to be safe without
3647 // additional testing.
3648 if (IsCalleeWin64 || IsCallerWin64)
3651 SmallVector<CCValAssign, 16> ArgLocs;
3652 CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(), ArgLocs,
3655 CCInfo.AnalyzeCallOperands(Outs, CC_X86);
3656 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i)
3657 if (!ArgLocs[i].isRegLoc())
3661 // If the call result is in ST0 / ST1, it needs to be popped off the x87
3662 // stack. Therefore, if it's not used by the call it is not safe to optimize
3663 // this into a sibcall.
3664 bool Unused = false;
3665 for (unsigned i = 0, e = Ins.size(); i != e; ++i) {
3672 SmallVector<CCValAssign, 16> RVLocs;
3673 CCState CCInfo(CalleeCC, false, DAG.getMachineFunction(), RVLocs,
3675 CCInfo.AnalyzeCallResult(Ins, RetCC_X86);
3676 for (unsigned i = 0, e = RVLocs.size(); i != e; ++i) {
3677 CCValAssign &VA = RVLocs[i];
3678 if (VA.getLocReg() == X86::FP0 || VA.getLocReg() == X86::FP1)
3683 // If the calling conventions do not match, then we'd better make sure the
3684 // results are returned in the same way as what the caller expects.
3686 SmallVector<CCValAssign, 16> RVLocs1;
3687 CCState CCInfo1(CalleeCC, false, DAG.getMachineFunction(), RVLocs1,
3689 CCInfo1.AnalyzeCallResult(Ins, RetCC_X86);
3691 SmallVector<CCValAssign, 16> RVLocs2;
3692 CCState CCInfo2(CallerCC, false, DAG.getMachineFunction(), RVLocs2,
3694 CCInfo2.AnalyzeCallResult(Ins, RetCC_X86);
3696 if (RVLocs1.size() != RVLocs2.size())
3698 for (unsigned i = 0, e = RVLocs1.size(); i != e; ++i) {
3699 if (RVLocs1[i].isRegLoc() != RVLocs2[i].isRegLoc())
3701 if (RVLocs1[i].getLocInfo() != RVLocs2[i].getLocInfo())
3703 if (RVLocs1[i].isRegLoc()) {
3704 if (RVLocs1[i].getLocReg() != RVLocs2[i].getLocReg())
3707 if (RVLocs1[i].getLocMemOffset() != RVLocs2[i].getLocMemOffset())
3713 unsigned StackArgsSize = 0;
3715 // If the callee takes no arguments then go on to check the results of the
3717 if (!Outs.empty()) {
3718 // Check if stack adjustment is needed. For now, do not do this if any
3719 // argument is passed on the stack.
3720 SmallVector<CCValAssign, 16> ArgLocs;
3721 CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(), ArgLocs,
3724 // Allocate shadow area for Win64
3726 CCInfo.AllocateStack(32, 8);
3728 CCInfo.AnalyzeCallOperands(Outs, CC_X86);
3729 StackArgsSize = CCInfo.getNextStackOffset();
3731 if (CCInfo.getNextStackOffset()) {
3732 // Check if the arguments are already laid out in the right way as
3733 // the caller's fixed stack objects.
3734 MachineFrameInfo *MFI = MF.getFrameInfo();
3735 const MachineRegisterInfo *MRI = &MF.getRegInfo();
3736 const X86InstrInfo *TII = Subtarget->getInstrInfo();
3737 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
3738 CCValAssign &VA = ArgLocs[i];
3739 SDValue Arg = OutVals[i];
3740 ISD::ArgFlagsTy Flags = Outs[i].Flags;
3741 if (VA.getLocInfo() == CCValAssign::Indirect)
3743 if (!VA.isRegLoc()) {
3744 if (!MatchingStackOffset(Arg, VA.getLocMemOffset(), Flags,
3751 // If the tailcall address may be in a register, then make sure it's
3752 // possible to register allocate for it. In 32-bit, the call address can
3753 // only target EAX, EDX, or ECX since the tail call must be scheduled after
3754 // callee-saved registers are restored. These happen to be the same
3755 // registers used to pass 'inreg' arguments so watch out for those.
3756 if (!Subtarget->is64Bit() &&
3757 ((!isa<GlobalAddressSDNode>(Callee) &&
3758 !isa<ExternalSymbolSDNode>(Callee)) ||
3759 DAG.getTarget().getRelocationModel() == Reloc::PIC_)) {
3760 unsigned NumInRegs = 0;
3761 // In PIC we need an extra register to formulate the address computation
3763 unsigned MaxInRegs =
3764 (DAG.getTarget().getRelocationModel() == Reloc::PIC_) ? 2 : 3;
3766 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
3767 CCValAssign &VA = ArgLocs[i];
3770 unsigned Reg = VA.getLocReg();
3773 case X86::EAX: case X86::EDX: case X86::ECX:
3774 if (++NumInRegs == MaxInRegs)
3782 bool CalleeWillPop =
3783 X86::isCalleePop(CalleeCC, Subtarget->is64Bit(), isVarArg,
3784 MF.getTarget().Options.GuaranteedTailCallOpt);
3786 if (unsigned BytesToPop =
3787 MF.getInfo<X86MachineFunctionInfo>()->getBytesToPopOnReturn()) {
3788 // If we have bytes to pop, the callee must pop them.
3789 bool CalleePopMatches = CalleeWillPop && BytesToPop == StackArgsSize;
3790 if (!CalleePopMatches)
3792 } else if (CalleeWillPop && StackArgsSize > 0) {
3793 // If we don't have bytes to pop, make sure the callee doesn't pop any.
3801 X86TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
3802 const TargetLibraryInfo *libInfo) const {
3803 return X86::createFastISel(funcInfo, libInfo);
3806 //===----------------------------------------------------------------------===//
3807 // Other Lowering Hooks
3808 //===----------------------------------------------------------------------===//
3810 static bool MayFoldLoad(SDValue Op) {
3811 return Op.hasOneUse() && ISD::isNormalLoad(Op.getNode());
3814 static bool MayFoldIntoStore(SDValue Op) {
3815 return Op.hasOneUse() && ISD::isNormalStore(*Op.getNode()->use_begin());
3818 static bool isTargetShuffle(unsigned Opcode) {
3820 default: return false;
3821 case X86ISD::BLENDI:
3822 case X86ISD::PSHUFB:
3823 case X86ISD::PSHUFD:
3824 case X86ISD::PSHUFHW:
3825 case X86ISD::PSHUFLW:
3827 case X86ISD::PALIGNR:
3828 case X86ISD::MOVLHPS:
3829 case X86ISD::MOVLHPD:
3830 case X86ISD::MOVHLPS:
3831 case X86ISD::MOVLPS:
3832 case X86ISD::MOVLPD:
3833 case X86ISD::MOVSHDUP:
3834 case X86ISD::MOVSLDUP:
3835 case X86ISD::MOVDDUP:
3838 case X86ISD::UNPCKL:
3839 case X86ISD::UNPCKH:
3840 case X86ISD::VPERMILPI:
3841 case X86ISD::VPERM2X128:
3842 case X86ISD::VPERMI:
3843 case X86ISD::VPERMV:
3844 case X86ISD::VPERMV3:
3849 static SDValue getTargetShuffleNode(unsigned Opc, SDLoc dl, MVT VT,
3850 SDValue V1, unsigned TargetMask,
3851 SelectionDAG &DAG) {
3853 default: llvm_unreachable("Unknown x86 shuffle node");
3854 case X86ISD::PSHUFD:
3855 case X86ISD::PSHUFHW:
3856 case X86ISD::PSHUFLW:
3857 case X86ISD::VPERMILPI:
3858 case X86ISD::VPERMI:
3859 return DAG.getNode(Opc, dl, VT, V1,
3860 DAG.getConstant(TargetMask, dl, MVT::i8));
3864 static SDValue getTargetShuffleNode(unsigned Opc, SDLoc dl, MVT VT,
3865 SDValue V1, SDValue V2, SelectionDAG &DAG) {
3867 default: llvm_unreachable("Unknown x86 shuffle node");
3868 case X86ISD::MOVLHPS:
3869 case X86ISD::MOVLHPD:
3870 case X86ISD::MOVHLPS:
3871 case X86ISD::MOVLPS:
3872 case X86ISD::MOVLPD:
3875 case X86ISD::UNPCKL:
3876 case X86ISD::UNPCKH:
3877 return DAG.getNode(Opc, dl, VT, V1, V2);
3881 SDValue X86TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) const {
3882 MachineFunction &MF = DAG.getMachineFunction();
3883 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3884 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
3885 int ReturnAddrIndex = FuncInfo->getRAIndex();
3887 if (ReturnAddrIndex == 0) {
3888 // Set up a frame object for the return address.
3889 unsigned SlotSize = RegInfo->getSlotSize();
3890 ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(SlotSize,
3893 FuncInfo->setRAIndex(ReturnAddrIndex);
3896 return DAG.getFrameIndex(ReturnAddrIndex, getPointerTy(DAG.getDataLayout()));
3899 bool X86::isOffsetSuitableForCodeModel(int64_t Offset, CodeModel::Model M,
3900 bool hasSymbolicDisplacement) {
3901 // Offset should fit into 32 bit immediate field.
3902 if (!isInt<32>(Offset))
3905 // If we don't have a symbolic displacement - we don't have any extra
3907 if (!hasSymbolicDisplacement)
3910 // FIXME: Some tweaks might be needed for medium code model.
3911 if (M != CodeModel::Small && M != CodeModel::Kernel)
3914 // For small code model we assume that latest object is 16MB before end of 31
3915 // bits boundary. We may also accept pretty large negative constants knowing
3916 // that all objects are in the positive half of address space.
3917 if (M == CodeModel::Small && Offset < 16*1024*1024)
3920 // For kernel code model we know that all object resist in the negative half
3921 // of 32bits address space. We may not accept negative offsets, since they may
3922 // be just off and we may accept pretty large positive ones.
3923 if (M == CodeModel::Kernel && Offset >= 0)
3929 /// Determines whether the callee is required to pop its own arguments.
3930 /// Callee pop is necessary to support tail calls.
3931 bool X86::isCalleePop(CallingConv::ID CallingConv,
3932 bool is64Bit, bool IsVarArg, bool GuaranteeTCO) {
3933 // If GuaranteeTCO is true, we force some calls to be callee pop so that we
3934 // can guarantee TCO.
3935 if (!IsVarArg && shouldGuaranteeTCO(CallingConv, GuaranteeTCO))
3938 switch (CallingConv) {
3941 case CallingConv::X86_StdCall:
3942 case CallingConv::X86_FastCall:
3943 case CallingConv::X86_ThisCall:
3944 case CallingConv::X86_VectorCall:
3949 /// \brief Return true if the condition is an unsigned comparison operation.
3950 static bool isX86CCUnsigned(unsigned X86CC) {
3952 default: llvm_unreachable("Invalid integer condition!");
3953 case X86::COND_E: return true;
3954 case X86::COND_G: return false;
3955 case X86::COND_GE: return false;
3956 case X86::COND_L: return false;
3957 case X86::COND_LE: return false;
3958 case X86::COND_NE: return true;
3959 case X86::COND_B: return true;
3960 case X86::COND_A: return true;
3961 case X86::COND_BE: return true;
3962 case X86::COND_AE: return true;
3966 static X86::CondCode TranslateIntegerX86CC(ISD::CondCode SetCCOpcode) {
3967 switch (SetCCOpcode) {
3968 default: llvm_unreachable("Invalid integer condition!");
3969 case ISD::SETEQ: return X86::COND_E;
3970 case ISD::SETGT: return X86::COND_G;
3971 case ISD::SETGE: return X86::COND_GE;
3972 case ISD::SETLT: return X86::COND_L;
3973 case ISD::SETLE: return X86::COND_LE;
3974 case ISD::SETNE: return X86::COND_NE;
3975 case ISD::SETULT: return X86::COND_B;
3976 case ISD::SETUGT: return X86::COND_A;
3977 case ISD::SETULE: return X86::COND_BE;
3978 case ISD::SETUGE: return X86::COND_AE;
3982 /// Do a one-to-one translation of a ISD::CondCode to the X86-specific
3983 /// condition code, returning the condition code and the LHS/RHS of the
3984 /// comparison to make.
3985 static unsigned TranslateX86CC(ISD::CondCode SetCCOpcode, SDLoc DL, bool isFP,
3986 SDValue &LHS, SDValue &RHS, SelectionDAG &DAG) {
3988 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) {
3989 if (SetCCOpcode == ISD::SETGT && RHSC->isAllOnesValue()) {
3990 // X > -1 -> X == 0, jump !sign.
3991 RHS = DAG.getConstant(0, DL, RHS.getValueType());
3992 return X86::COND_NS;
3994 if (SetCCOpcode == ISD::SETLT && RHSC->isNullValue()) {
3995 // X < 0 -> X == 0, jump on sign.
3998 if (SetCCOpcode == ISD::SETLT && RHSC->getZExtValue() == 1) {
4000 RHS = DAG.getConstant(0, DL, RHS.getValueType());
4001 return X86::COND_LE;
4005 return TranslateIntegerX86CC(SetCCOpcode);
4008 // First determine if it is required or is profitable to flip the operands.
4010 // If LHS is a foldable load, but RHS is not, flip the condition.
4011 if (ISD::isNON_EXTLoad(LHS.getNode()) &&
4012 !ISD::isNON_EXTLoad(RHS.getNode())) {
4013 SetCCOpcode = getSetCCSwappedOperands(SetCCOpcode);
4014 std::swap(LHS, RHS);
4017 switch (SetCCOpcode) {
4023 std::swap(LHS, RHS);
4027 // On a floating point condition, the flags are set as follows:
4029 // 0 | 0 | 0 | X > Y
4030 // 0 | 0 | 1 | X < Y
4031 // 1 | 0 | 0 | X == Y
4032 // 1 | 1 | 1 | unordered
4033 switch (SetCCOpcode) {
4034 default: llvm_unreachable("Condcode should be pre-legalized away");
4036 case ISD::SETEQ: return X86::COND_E;
4037 case ISD::SETOLT: // flipped
4039 case ISD::SETGT: return X86::COND_A;
4040 case ISD::SETOLE: // flipped
4042 case ISD::SETGE: return X86::COND_AE;
4043 case ISD::SETUGT: // flipped
4045 case ISD::SETLT: return X86::COND_B;
4046 case ISD::SETUGE: // flipped
4048 case ISD::SETLE: return X86::COND_BE;
4050 case ISD::SETNE: return X86::COND_NE;
4051 case ISD::SETUO: return X86::COND_P;
4052 case ISD::SETO: return X86::COND_NP;
4054 case ISD::SETUNE: return X86::COND_INVALID;
4058 /// Is there a floating point cmov for the specific X86 condition code?
4059 /// Current x86 isa includes the following FP cmov instructions:
4060 /// fcmovb, fcomvbe, fcomve, fcmovu, fcmovae, fcmova, fcmovne, fcmovnu.
4061 static bool hasFPCMov(unsigned X86CC) {
4077 /// Returns true if the target can instruction select the
4078 /// specified FP immediate natively. If false, the legalizer will
4079 /// materialize the FP immediate as a load from a constant pool.
4080 bool X86TargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
4081 for (unsigned i = 0, e = LegalFPImmediates.size(); i != e; ++i) {
4082 if (Imm.bitwiseIsEqual(LegalFPImmediates[i]))
4088 bool X86TargetLowering::shouldReduceLoadWidth(SDNode *Load,
4089 ISD::LoadExtType ExtTy,
4091 // "ELF Handling for Thread-Local Storage" specifies that R_X86_64_GOTTPOFF
4092 // relocation target a movq or addq instruction: don't let the load shrink.
4093 SDValue BasePtr = cast<LoadSDNode>(Load)->getBasePtr();
4094 if (BasePtr.getOpcode() == X86ISD::WrapperRIP)
4095 if (const auto *GA = dyn_cast<GlobalAddressSDNode>(BasePtr.getOperand(0)))
4096 return GA->getTargetFlags() != X86II::MO_GOTTPOFF;
4100 /// \brief Returns true if it is beneficial to convert a load of a constant
4101 /// to just the constant itself.
4102 bool X86TargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
4104 assert(Ty->isIntegerTy());
4106 unsigned BitSize = Ty->getPrimitiveSizeInBits();
4107 if (BitSize == 0 || BitSize > 64)
4112 bool X86TargetLowering::isExtractSubvectorCheap(EVT ResVT,
4113 unsigned Index) const {
4114 if (!isOperationLegalOrCustom(ISD::EXTRACT_SUBVECTOR, ResVT))
4117 return (Index == 0 || Index == ResVT.getVectorNumElements());
4120 bool X86TargetLowering::isCheapToSpeculateCttz() const {
4121 // Speculate cttz only if we can directly use TZCNT.
4122 return Subtarget->hasBMI();
4125 bool X86TargetLowering::isCheapToSpeculateCtlz() const {
4126 // Speculate ctlz only if we can directly use LZCNT.
4127 return Subtarget->hasLZCNT();
4130 /// Return true if every element in Mask, beginning
4131 /// from position Pos and ending in Pos+Size is undef.
4132 static bool isUndefInRange(ArrayRef<int> Mask, unsigned Pos, unsigned Size) {
4133 for (unsigned i = Pos, e = Pos + Size; i != e; ++i)
4139 /// Return true if Val is undef or if its value falls within the
4140 /// specified range (L, H].
4141 static bool isUndefOrInRange(int Val, int Low, int Hi) {
4142 return (Val < 0) || (Val >= Low && Val < Hi);
4145 /// Val is either less than zero (undef) or equal to the specified value.
4146 static bool isUndefOrEqual(int Val, int CmpVal) {
4147 return (Val < 0 || Val == CmpVal);
4150 /// Return true if every element in Mask, beginning
4151 /// from position Pos and ending in Pos+Size, falls within the specified
4152 /// sequential range (Low, Low+Size]. or is undef.
4153 static bool isSequentialOrUndefInRange(ArrayRef<int> Mask,
4154 unsigned Pos, unsigned Size, int Low) {
4155 for (unsigned i = Pos, e = Pos+Size; i != e; ++i, ++Low)
4156 if (!isUndefOrEqual(Mask[i], Low))
4161 /// Return true if the specified EXTRACT_SUBVECTOR operand specifies a vector
4162 /// extract that is suitable for instruction that extract 128 or 256 bit vectors
4163 static bool isVEXTRACTIndex(SDNode *N, unsigned vecWidth) {
4164 assert((vecWidth == 128 || vecWidth == 256) && "Unexpected vector width");
4165 if (!isa<ConstantSDNode>(N->getOperand(1).getNode()))
4168 // The index should be aligned on a vecWidth-bit boundary.
4170 cast<ConstantSDNode>(N->getOperand(1).getNode())->getZExtValue();
4172 MVT VT = N->getSimpleValueType(0);
4173 unsigned ElSize = VT.getVectorElementType().getSizeInBits();
4174 bool Result = (Index * ElSize) % vecWidth == 0;
4179 /// Return true if the specified INSERT_SUBVECTOR
4180 /// operand specifies a subvector insert that is suitable for input to
4181 /// insertion of 128 or 256-bit subvectors
4182 static bool isVINSERTIndex(SDNode *N, unsigned vecWidth) {
4183 assert((vecWidth == 128 || vecWidth == 256) && "Unexpected vector width");
4184 if (!isa<ConstantSDNode>(N->getOperand(2).getNode()))
4186 // The index should be aligned on a vecWidth-bit boundary.
4188 cast<ConstantSDNode>(N->getOperand(2).getNode())->getZExtValue();
4190 MVT VT = N->getSimpleValueType(0);
4191 unsigned ElSize = VT.getVectorElementType().getSizeInBits();
4192 bool Result = (Index * ElSize) % vecWidth == 0;
4197 bool X86::isVINSERT128Index(SDNode *N) {
4198 return isVINSERTIndex(N, 128);
4201 bool X86::isVINSERT256Index(SDNode *N) {
4202 return isVINSERTIndex(N, 256);
4205 bool X86::isVEXTRACT128Index(SDNode *N) {
4206 return isVEXTRACTIndex(N, 128);
4209 bool X86::isVEXTRACT256Index(SDNode *N) {
4210 return isVEXTRACTIndex(N, 256);
4213 static unsigned getExtractVEXTRACTImmediate(SDNode *N, unsigned vecWidth) {
4214 assert((vecWidth == 128 || vecWidth == 256) && "Unsupported vector width");
4215 assert(isa<ConstantSDNode>(N->getOperand(1).getNode()) &&
4216 "Illegal extract subvector for VEXTRACT");
4219 cast<ConstantSDNode>(N->getOperand(1).getNode())->getZExtValue();
4221 MVT VecVT = N->getOperand(0).getSimpleValueType();
4222 MVT ElVT = VecVT.getVectorElementType();
4224 unsigned NumElemsPerChunk = vecWidth / ElVT.getSizeInBits();
4225 return Index / NumElemsPerChunk;
4228 static unsigned getInsertVINSERTImmediate(SDNode *N, unsigned vecWidth) {
4229 assert((vecWidth == 128 || vecWidth == 256) && "Unsupported vector width");
4230 assert(isa<ConstantSDNode>(N->getOperand(2).getNode()) &&
4231 "Illegal insert subvector for VINSERT");
4234 cast<ConstantSDNode>(N->getOperand(2).getNode())->getZExtValue();
4236 MVT VecVT = N->getSimpleValueType(0);
4237 MVT ElVT = VecVT.getVectorElementType();
4239 unsigned NumElemsPerChunk = vecWidth / ElVT.getSizeInBits();
4240 return Index / NumElemsPerChunk;
4243 /// Return the appropriate immediate to extract the specified
4244 /// EXTRACT_SUBVECTOR index with VEXTRACTF128 and VINSERTI128 instructions.
4245 unsigned X86::getExtractVEXTRACT128Immediate(SDNode *N) {
4246 return getExtractVEXTRACTImmediate(N, 128);
4249 /// Return the appropriate immediate to extract the specified
4250 /// EXTRACT_SUBVECTOR index with VEXTRACTF64x4 and VINSERTI64x4 instructions.
4251 unsigned X86::getExtractVEXTRACT256Immediate(SDNode *N) {
4252 return getExtractVEXTRACTImmediate(N, 256);
4255 /// Return the appropriate immediate to insert at the specified
4256 /// INSERT_SUBVECTOR index with VINSERTF128 and VINSERTI128 instructions.
4257 unsigned X86::getInsertVINSERT128Immediate(SDNode *N) {
4258 return getInsertVINSERTImmediate(N, 128);
4261 /// Return the appropriate immediate to insert at the specified
4262 /// INSERT_SUBVECTOR index with VINSERTF46x4 and VINSERTI64x4 instructions.
4263 unsigned X86::getInsertVINSERT256Immediate(SDNode *N) {
4264 return getInsertVINSERTImmediate(N, 256);
4267 /// Returns true if Elt is a constant zero or a floating point constant +0.0.
4268 bool X86::isZeroNode(SDValue Elt) {
4269 return isNullConstant(Elt) || isNullFPConstant(Elt);
4272 // Build a vector of constants
4273 // Use an UNDEF node if MaskElt == -1.
4274 // Spilt 64-bit constants in the 32-bit mode.
4275 static SDValue getConstVector(ArrayRef<int> Values, MVT VT,
4277 SDLoc dl, bool IsMask = false) {
4279 SmallVector<SDValue, 32> Ops;
4282 MVT ConstVecVT = VT;
4283 unsigned NumElts = VT.getVectorNumElements();
4284 bool In64BitMode = DAG.getTargetLoweringInfo().isTypeLegal(MVT::i64);
4285 if (!In64BitMode && VT.getVectorElementType() == MVT::i64) {
4286 ConstVecVT = MVT::getVectorVT(MVT::i32, NumElts * 2);
4290 MVT EltVT = ConstVecVT.getVectorElementType();
4291 for (unsigned i = 0; i < NumElts; ++i) {
4292 bool IsUndef = Values[i] < 0 && IsMask;
4293 SDValue OpNode = IsUndef ? DAG.getUNDEF(EltVT) :
4294 DAG.getConstant(Values[i], dl, EltVT);
4295 Ops.push_back(OpNode);
4297 Ops.push_back(IsUndef ? DAG.getUNDEF(EltVT) :
4298 DAG.getConstant(0, dl, EltVT));
4300 SDValue ConstsNode = DAG.getNode(ISD::BUILD_VECTOR, dl, ConstVecVT, Ops);
4302 ConstsNode = DAG.getBitcast(VT, ConstsNode);
4306 /// Returns a vector of specified type with all zero elements.
4307 static SDValue getZeroVector(MVT VT, const X86Subtarget *Subtarget,
4308 SelectionDAG &DAG, SDLoc dl) {
4309 assert(VT.isVector() && "Expected a vector type");
4311 // Always build SSE zero vectors as <4 x i32> bitcasted
4312 // to their dest type. This ensures they get CSE'd.
4314 if (VT.is128BitVector()) { // SSE
4315 if (Subtarget->hasSSE2()) { // SSE2
4316 SDValue Cst = DAG.getConstant(0, dl, MVT::i32);
4317 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
4319 SDValue Cst = DAG.getConstantFP(+0.0, dl, MVT::f32);
4320 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4f32, Cst, Cst, Cst, Cst);
4322 } else if (VT.is256BitVector()) { // AVX
4323 if (Subtarget->hasInt256()) { // AVX2
4324 SDValue Cst = DAG.getConstant(0, dl, MVT::i32);
4325 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4326 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8i32, Ops);
4328 // 256-bit logic and arithmetic instructions in AVX are all
4329 // floating-point, no support for integer ops. Emit fp zeroed vectors.
4330 SDValue Cst = DAG.getConstantFP(+0.0, dl, MVT::f32);
4331 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4332 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8f32, Ops);
4334 } else if (VT.is512BitVector()) { // AVX-512
4335 SDValue Cst = DAG.getConstant(0, dl, MVT::i32);
4336 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst,
4337 Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4338 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v16i32, Ops);
4339 } else if (VT.getVectorElementType() == MVT::i1) {
4341 assert((Subtarget->hasBWI() || VT.getVectorNumElements() <= 16)
4342 && "Unexpected vector type");
4343 assert((Subtarget->hasVLX() || VT.getVectorNumElements() >= 8)
4344 && "Unexpected vector type");
4345 SDValue Cst = DAG.getConstant(0, dl, MVT::i1);
4346 SmallVector<SDValue, 64> Ops(VT.getVectorNumElements(), Cst);
4347 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Ops);
4349 llvm_unreachable("Unexpected vector type");
4351 return DAG.getBitcast(VT, Vec);
4354 static SDValue ExtractSubVector(SDValue Vec, unsigned IdxVal,
4355 SelectionDAG &DAG, SDLoc dl,
4356 unsigned vectorWidth) {
4357 assert((vectorWidth == 128 || vectorWidth == 256) &&
4358 "Unsupported vector width");
4359 EVT VT = Vec.getValueType();
4360 EVT ElVT = VT.getVectorElementType();
4361 unsigned Factor = VT.getSizeInBits()/vectorWidth;
4362 EVT ResultVT = EVT::getVectorVT(*DAG.getContext(), ElVT,
4363 VT.getVectorNumElements()/Factor);
4365 // Extract from UNDEF is UNDEF.
4366 if (Vec.getOpcode() == ISD::UNDEF)
4367 return DAG.getUNDEF(ResultVT);
4369 // Extract the relevant vectorWidth bits. Generate an EXTRACT_SUBVECTOR
4370 unsigned ElemsPerChunk = vectorWidth / ElVT.getSizeInBits();
4371 assert(isPowerOf2_32(ElemsPerChunk) && "Elements per chunk not power of 2");
4373 // This is the index of the first element of the vectorWidth-bit chunk
4374 // we want. Since ElemsPerChunk is a power of 2 just need to clear bits.
4375 IdxVal &= ~(ElemsPerChunk - 1);
4377 // If the input is a buildvector just emit a smaller one.
4378 if (Vec.getOpcode() == ISD::BUILD_VECTOR)
4379 return DAG.getNode(ISD::BUILD_VECTOR, dl, ResultVT,
4380 makeArrayRef(Vec->op_begin() + IdxVal, ElemsPerChunk));
4382 SDValue VecIdx = DAG.getIntPtrConstant(IdxVal, dl);
4383 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, ResultVT, Vec, VecIdx);
4386 /// Generate a DAG to grab 128-bits from a vector > 128 bits. This
4387 /// sets things up to match to an AVX VEXTRACTF128 / VEXTRACTI128
4388 /// or AVX-512 VEXTRACTF32x4 / VEXTRACTI32x4
4389 /// instructions or a simple subregister reference. Idx is an index in the
4390 /// 128 bits we want. It need not be aligned to a 128-bit boundary. That makes
4391 /// lowering EXTRACT_VECTOR_ELT operations easier.
4392 static SDValue Extract128BitVector(SDValue Vec, unsigned IdxVal,
4393 SelectionDAG &DAG, SDLoc dl) {
4394 assert((Vec.getValueType().is256BitVector() ||
4395 Vec.getValueType().is512BitVector()) && "Unexpected vector size!");
4396 return ExtractSubVector(Vec, IdxVal, DAG, dl, 128);
4399 /// Generate a DAG to grab 256-bits from a 512-bit vector.
4400 static SDValue Extract256BitVector(SDValue Vec, unsigned IdxVal,
4401 SelectionDAG &DAG, SDLoc dl) {
4402 assert(Vec.getValueType().is512BitVector() && "Unexpected vector size!");
4403 return ExtractSubVector(Vec, IdxVal, DAG, dl, 256);
4406 static SDValue InsertSubVector(SDValue Result, SDValue Vec,
4407 unsigned IdxVal, SelectionDAG &DAG,
4408 SDLoc dl, unsigned vectorWidth) {
4409 assert((vectorWidth == 128 || vectorWidth == 256) &&
4410 "Unsupported vector width");
4411 // Inserting UNDEF is Result
4412 if (Vec.getOpcode() == ISD::UNDEF)
4414 EVT VT = Vec.getValueType();
4415 EVT ElVT = VT.getVectorElementType();
4416 EVT ResultVT = Result.getValueType();
4418 // Insert the relevant vectorWidth bits.
4419 unsigned ElemsPerChunk = vectorWidth/ElVT.getSizeInBits();
4420 assert(isPowerOf2_32(ElemsPerChunk) && "Elements per chunk not power of 2");
4422 // This is the index of the first element of the vectorWidth-bit chunk
4423 // we want. Since ElemsPerChunk is a power of 2 just need to clear bits.
4424 IdxVal &= ~(ElemsPerChunk - 1);
4426 SDValue VecIdx = DAG.getIntPtrConstant(IdxVal, dl);
4427 return DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResultVT, Result, Vec, VecIdx);
4430 /// Generate a DAG to put 128-bits into a vector > 128 bits. This
4431 /// sets things up to match to an AVX VINSERTF128/VINSERTI128 or
4432 /// AVX-512 VINSERTF32x4/VINSERTI32x4 instructions or a
4433 /// simple superregister reference. Idx is an index in the 128 bits
4434 /// we want. It need not be aligned to a 128-bit boundary. That makes
4435 /// lowering INSERT_VECTOR_ELT operations easier.
4436 static SDValue Insert128BitVector(SDValue Result, SDValue Vec, unsigned IdxVal,
4437 SelectionDAG &DAG, SDLoc dl) {
4438 assert(Vec.getValueType().is128BitVector() && "Unexpected vector size!");
4440 // For insertion into the zero index (low half) of a 256-bit vector, it is
4441 // more efficient to generate a blend with immediate instead of an insert*128.
4442 // We are still creating an INSERT_SUBVECTOR below with an undef node to
4443 // extend the subvector to the size of the result vector. Make sure that
4444 // we are not recursing on that node by checking for undef here.
4445 if (IdxVal == 0 && Result.getValueType().is256BitVector() &&
4446 Result.getOpcode() != ISD::UNDEF) {
4447 EVT ResultVT = Result.getValueType();
4448 SDValue ZeroIndex = DAG.getIntPtrConstant(0, dl);
4449 SDValue Undef = DAG.getUNDEF(ResultVT);
4450 SDValue Vec256 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResultVT, Undef,
4453 // The blend instruction, and therefore its mask, depend on the data type.
4454 MVT ScalarType = ResultVT.getVectorElementType().getSimpleVT();
4455 if (ScalarType.isFloatingPoint()) {
4456 // Choose either vblendps (float) or vblendpd (double).
4457 unsigned ScalarSize = ScalarType.getSizeInBits();
4458 assert((ScalarSize == 64 || ScalarSize == 32) && "Unknown float type");
4459 unsigned MaskVal = (ScalarSize == 64) ? 0x03 : 0x0f;
4460 SDValue Mask = DAG.getConstant(MaskVal, dl, MVT::i8);
4461 return DAG.getNode(X86ISD::BLENDI, dl, ResultVT, Result, Vec256, Mask);
4464 const X86Subtarget &Subtarget =
4465 static_cast<const X86Subtarget &>(DAG.getSubtarget());
4467 // AVX2 is needed for 256-bit integer blend support.
4468 // Integers must be cast to 32-bit because there is only vpblendd;
4469 // vpblendw can't be used for this because it has a handicapped mask.
4471 // If we don't have AVX2, then cast to float. Using a wrong domain blend
4472 // is still more efficient than using the wrong domain vinsertf128 that
4473 // will be created by InsertSubVector().
4474 MVT CastVT = Subtarget.hasAVX2() ? MVT::v8i32 : MVT::v8f32;
4476 SDValue Mask = DAG.getConstant(0x0f, dl, MVT::i8);
4477 Vec256 = DAG.getBitcast(CastVT, Vec256);
4478 Vec256 = DAG.getNode(X86ISD::BLENDI, dl, CastVT, Result, Vec256, Mask);
4479 return DAG.getBitcast(ResultVT, Vec256);
4482 return InsertSubVector(Result, Vec, IdxVal, DAG, dl, 128);
4485 static SDValue Insert256BitVector(SDValue Result, SDValue Vec, unsigned IdxVal,
4486 SelectionDAG &DAG, SDLoc dl) {
4487 assert(Vec.getValueType().is256BitVector() && "Unexpected vector size!");
4488 return InsertSubVector(Result, Vec, IdxVal, DAG, dl, 256);
4491 /// Insert i1-subvector to i1-vector.
4492 static SDValue Insert1BitVector(SDValue Op, SelectionDAG &DAG) {
4495 SDValue Vec = Op.getOperand(0);
4496 SDValue SubVec = Op.getOperand(1);
4497 SDValue Idx = Op.getOperand(2);
4499 if (!isa<ConstantSDNode>(Idx))
4502 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
4503 if (IdxVal == 0 && Vec.isUndef()) // the operation is legal
4506 MVT OpVT = Op.getSimpleValueType();
4507 MVT SubVecVT = SubVec.getSimpleValueType();
4508 unsigned NumElems = OpVT.getVectorNumElements();
4509 unsigned SubVecNumElems = SubVecVT.getVectorNumElements();
4511 assert(IdxVal + SubVecNumElems <= NumElems &&
4512 IdxVal % SubVecVT.getSizeInBits() == 0 &&
4513 "Unexpected index value in INSERT_SUBVECTOR");
4515 // There are 3 possible cases:
4516 // 1. Subvector should be inserted in the lower part (IdxVal == 0)
4517 // 2. Subvector should be inserted in the upper part
4518 // (IdxVal + SubVecNumElems == NumElems)
4519 // 3. Subvector should be inserted in the middle (for example v2i1
4520 // to v16i1, index 2)
4522 SDValue ZeroIdx = DAG.getIntPtrConstant(0, dl);
4523 SDValue Undef = DAG.getUNDEF(OpVT);
4524 SDValue WideSubVec =
4525 DAG.getNode(ISD::INSERT_SUBVECTOR, dl, OpVT, Undef, SubVec, ZeroIdx);
4527 return DAG.getNode(X86ISD::VSHLI, dl, OpVT, WideSubVec,
4528 DAG.getConstant(IdxVal, dl, MVT::i8));
4530 if (ISD::isBuildVectorAllZeros(Vec.getNode())) {
4531 unsigned ShiftLeft = NumElems - SubVecNumElems;
4532 unsigned ShiftRight = NumElems - SubVecNumElems - IdxVal;
4533 WideSubVec = DAG.getNode(X86ISD::VSHLI, dl, OpVT, WideSubVec,
4534 DAG.getConstant(ShiftLeft, dl, MVT::i8));
4535 return ShiftRight ? DAG.getNode(X86ISD::VSRLI, dl, OpVT, WideSubVec,
4536 DAG.getConstant(ShiftRight, dl, MVT::i8)) : WideSubVec;
4540 // Zero lower bits of the Vec
4541 SDValue ShiftBits = DAG.getConstant(SubVecNumElems, dl, MVT::i8);
4542 Vec = DAG.getNode(X86ISD::VSRLI, dl, OpVT, Vec, ShiftBits);
4543 Vec = DAG.getNode(X86ISD::VSHLI, dl, OpVT, Vec, ShiftBits);
4544 // Merge them together
4545 return DAG.getNode(ISD::OR, dl, OpVT, Vec, WideSubVec);
4548 // Simple case when we put subvector in the upper part
4549 if (IdxVal + SubVecNumElems == NumElems) {
4550 // Zero upper bits of the Vec
4551 WideSubVec = DAG.getNode(X86ISD::VSHLI, dl, OpVT, Vec,
4552 DAG.getConstant(IdxVal, dl, MVT::i8));
4553 SDValue ShiftBits = DAG.getConstant(SubVecNumElems, dl, MVT::i8);
4554 Vec = DAG.getNode(X86ISD::VSHLI, dl, OpVT, Vec, ShiftBits);
4555 Vec = DAG.getNode(X86ISD::VSRLI, dl, OpVT, Vec, ShiftBits);
4556 return DAG.getNode(ISD::OR, dl, OpVT, Vec, WideSubVec);
4558 // Subvector should be inserted in the middle - use shuffle
4559 SmallVector<int, 64> Mask;
4560 for (unsigned i = 0; i < NumElems; ++i)
4561 Mask.push_back(i >= IdxVal && i < IdxVal + SubVecNumElems ?
4563 return DAG.getVectorShuffle(OpVT, dl, WideSubVec, Vec, Mask);
4566 /// Concat two 128-bit vectors into a 256 bit vector using VINSERTF128
4567 /// instructions. This is used because creating CONCAT_VECTOR nodes of
4568 /// BUILD_VECTORS returns a larger BUILD_VECTOR while we're trying to lower
4569 /// large BUILD_VECTORS.
4570 static SDValue Concat128BitVectors(SDValue V1, SDValue V2, EVT VT,
4571 unsigned NumElems, SelectionDAG &DAG,
4573 SDValue V = Insert128BitVector(DAG.getUNDEF(VT), V1, 0, DAG, dl);
4574 return Insert128BitVector(V, V2, NumElems/2, DAG, dl);
4577 static SDValue Concat256BitVectors(SDValue V1, SDValue V2, EVT VT,
4578 unsigned NumElems, SelectionDAG &DAG,
4580 SDValue V = Insert256BitVector(DAG.getUNDEF(VT), V1, 0, DAG, dl);
4581 return Insert256BitVector(V, V2, NumElems/2, DAG, dl);
4584 /// Returns a vector of specified type with all bits set.
4585 /// Always build ones vectors as <4 x i32> or <8 x i32>. For 256-bit types with
4586 /// no AVX2 supprt, use two <4 x i32> inserted in a <8 x i32> appropriately.
4587 /// Then bitcast to their original type, ensuring they get CSE'd.
4588 static SDValue getOnesVector(EVT VT, const X86Subtarget *Subtarget,
4589 SelectionDAG &DAG, SDLoc dl) {
4590 assert(VT.isVector() && "Expected a vector type");
4592 SDValue Cst = DAG.getConstant(~0U, dl, MVT::i32);
4594 if (VT.is512BitVector()) {
4595 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst,
4596 Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4597 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v16i32, Ops);
4598 } else if (VT.is256BitVector()) {
4599 if (Subtarget->hasInt256()) { // AVX2
4600 SDValue Ops[] = { Cst, Cst, Cst, Cst, Cst, Cst, Cst, Cst };
4601 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v8i32, Ops);
4603 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
4604 Vec = Concat128BitVectors(Vec, Vec, MVT::v8i32, 8, DAG, dl);
4606 } else if (VT.is128BitVector()) {
4607 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32, Cst, Cst, Cst, Cst);
4609 llvm_unreachable("Unexpected vector type");
4611 return DAG.getBitcast(VT, Vec);
4614 /// Returns a vector_shuffle node for an unpackl operation.
4615 static SDValue getUnpackl(SelectionDAG &DAG, SDLoc dl, MVT VT, SDValue V1,
4617 unsigned NumElems = VT.getVectorNumElements();
4618 SmallVector<int, 8> Mask;
4619 for (unsigned i = 0, e = NumElems/2; i != e; ++i) {
4621 Mask.push_back(i + NumElems);
4623 return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
4626 /// Returns a vector_shuffle node for an unpackh operation.
4627 static SDValue getUnpackh(SelectionDAG &DAG, SDLoc dl, MVT VT, SDValue V1,
4629 unsigned NumElems = VT.getVectorNumElements();
4630 SmallVector<int, 8> Mask;
4631 for (unsigned i = 0, Half = NumElems/2; i != Half; ++i) {
4632 Mask.push_back(i + Half);
4633 Mask.push_back(i + NumElems + Half);
4635 return DAG.getVectorShuffle(VT, dl, V1, V2, &Mask[0]);
4638 /// Return a vector_shuffle of the specified vector of zero or undef vector.
4639 /// This produces a shuffle where the low element of V2 is swizzled into the
4640 /// zero/undef vector, landing at element Idx.
4641 /// This produces a shuffle mask like 4,1,2,3 (idx=0) or 0,1,2,4 (idx=3).
4642 static SDValue getShuffleVectorZeroOrUndef(SDValue V2, unsigned Idx,
4644 const X86Subtarget *Subtarget,
4645 SelectionDAG &DAG) {
4646 MVT VT = V2.getSimpleValueType();
4648 ? getZeroVector(VT, Subtarget, DAG, SDLoc(V2)) : DAG.getUNDEF(VT);
4649 unsigned NumElems = VT.getVectorNumElements();
4650 SmallVector<int, 16> MaskVec;
4651 for (unsigned i = 0; i != NumElems; ++i)
4652 // If this is the insertion idx, put the low elt of V2 here.
4653 MaskVec.push_back(i == Idx ? NumElems : i);
4654 return DAG.getVectorShuffle(VT, SDLoc(V2), V1, V2, &MaskVec[0]);
4657 /// Calculates the shuffle mask corresponding to the target-specific opcode.
4658 /// Returns true if the Mask could be calculated. Sets IsUnary to true if only
4659 /// uses one source. Note that this will set IsUnary for shuffles which use a
4660 /// single input multiple times, and in those cases it will
4661 /// adjust the mask to only have indices within that single input.
4662 /// FIXME: Add support for Decode*Mask functions that return SM_SentinelZero.
4663 static bool getTargetShuffleMask(SDNode *N, MVT VT,
4664 SmallVectorImpl<int> &Mask, bool &IsUnary) {
4665 unsigned NumElems = VT.getVectorNumElements();
4669 bool IsFakeUnary = false;
4670 switch(N->getOpcode()) {
4671 case X86ISD::BLENDI:
4672 ImmN = N->getOperand(N->getNumOperands()-1);
4673 DecodeBLENDMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4676 ImmN = N->getOperand(N->getNumOperands()-1);
4677 DecodeSHUFPMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4678 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4680 case X86ISD::UNPCKH:
4681 DecodeUNPCKHMask(VT, Mask);
4682 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4684 case X86ISD::UNPCKL:
4685 DecodeUNPCKLMask(VT, Mask);
4686 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4688 case X86ISD::MOVHLPS:
4689 DecodeMOVHLPSMask(NumElems, Mask);
4690 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4692 case X86ISD::MOVLHPS:
4693 DecodeMOVLHPSMask(NumElems, Mask);
4694 IsUnary = IsFakeUnary = N->getOperand(0) == N->getOperand(1);
4696 case X86ISD::PALIGNR:
4697 ImmN = N->getOperand(N->getNumOperands()-1);
4698 DecodePALIGNRMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4700 case X86ISD::PSHUFD:
4701 case X86ISD::VPERMILPI:
4702 ImmN = N->getOperand(N->getNumOperands()-1);
4703 DecodePSHUFMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4706 case X86ISD::PSHUFHW:
4707 ImmN = N->getOperand(N->getNumOperands()-1);
4708 DecodePSHUFHWMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4711 case X86ISD::PSHUFLW:
4712 ImmN = N->getOperand(N->getNumOperands()-1);
4713 DecodePSHUFLWMask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4716 case X86ISD::PSHUFB: {
4718 SDValue MaskNode = N->getOperand(1);
4719 while (MaskNode->getOpcode() == ISD::BITCAST)
4720 MaskNode = MaskNode->getOperand(0);
4722 if (MaskNode->getOpcode() == ISD::BUILD_VECTOR) {
4723 // If we have a build-vector, then things are easy.
4724 MVT VT = MaskNode.getSimpleValueType();
4725 assert(VT.isVector() &&
4726 "Can't produce a non-vector with a build_vector!");
4727 if (!VT.isInteger())
4730 int NumBytesPerElement = VT.getVectorElementType().getSizeInBits() / 8;
4732 SmallVector<uint64_t, 32> RawMask;
4733 for (int i = 0, e = MaskNode->getNumOperands(); i < e; ++i) {
4734 SDValue Op = MaskNode->getOperand(i);
4735 if (Op->getOpcode() == ISD::UNDEF) {
4736 RawMask.push_back((uint64_t)SM_SentinelUndef);
4739 auto *CN = dyn_cast<ConstantSDNode>(Op.getNode());
4742 APInt MaskElement = CN->getAPIntValue();
4744 // We now have to decode the element which could be any integer size and
4745 // extract each byte of it.
4746 for (int j = 0; j < NumBytesPerElement; ++j) {
4747 // Note that this is x86 and so always little endian: the low byte is
4748 // the first byte of the mask.
4749 RawMask.push_back(MaskElement.getLoBits(8).getZExtValue());
4750 MaskElement = MaskElement.lshr(8);
4753 DecodePSHUFBMask(RawMask, Mask);
4757 auto *MaskLoad = dyn_cast<LoadSDNode>(MaskNode);
4761 SDValue Ptr = MaskLoad->getBasePtr();
4762 if (Ptr->getOpcode() == X86ISD::Wrapper ||
4763 Ptr->getOpcode() == X86ISD::WrapperRIP)
4764 Ptr = Ptr->getOperand(0);
4766 auto *MaskCP = dyn_cast<ConstantPoolSDNode>(Ptr);
4767 if (!MaskCP || MaskCP->isMachineConstantPoolEntry())
4770 if (auto *C = dyn_cast<Constant>(MaskCP->getConstVal())) {
4771 DecodePSHUFBMask(C, Mask);
4779 case X86ISD::VPERMI:
4780 ImmN = N->getOperand(N->getNumOperands()-1);
4781 DecodeVPERMMask(cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4786 DecodeScalarMoveMask(VT, /* IsLoad */ false, Mask);
4788 case X86ISD::VPERM2X128:
4789 ImmN = N->getOperand(N->getNumOperands()-1);
4790 DecodeVPERM2X128Mask(VT, cast<ConstantSDNode>(ImmN)->getZExtValue(), Mask);
4791 if (Mask.empty()) return false;
4792 // Mask only contains negative index if an element is zero.
4793 if (std::any_of(Mask.begin(), Mask.end(),
4794 [](int M){ return M == SM_SentinelZero; }))
4797 case X86ISD::MOVSLDUP:
4798 DecodeMOVSLDUPMask(VT, Mask);
4801 case X86ISD::MOVSHDUP:
4802 DecodeMOVSHDUPMask(VT, Mask);
4805 case X86ISD::MOVDDUP:
4806 DecodeMOVDDUPMask(VT, Mask);
4809 case X86ISD::MOVLHPD:
4810 case X86ISD::MOVLPD:
4811 case X86ISD::MOVLPS:
4812 // Not yet implemented
4814 case X86ISD::VPERMV: {
4816 SDValue MaskNode = N->getOperand(0);
4817 while (MaskNode->getOpcode() == ISD::BITCAST)
4818 MaskNode = MaskNode->getOperand(0);
4820 unsigned MaskLoBits = Log2_64(VT.getVectorNumElements());
4821 SmallVector<uint64_t, 32> RawMask;
4822 if (MaskNode->getOpcode() == ISD::BUILD_VECTOR) {
4823 // If we have a build-vector, then things are easy.
4824 assert(MaskNode.getSimpleValueType().isInteger() &&
4825 MaskNode.getSimpleValueType().getVectorNumElements() ==
4826 VT.getVectorNumElements());
4828 for (unsigned i = 0; i < MaskNode->getNumOperands(); ++i) {
4829 SDValue Op = MaskNode->getOperand(i);
4830 if (Op->getOpcode() == ISD::UNDEF)
4831 RawMask.push_back((uint64_t)SM_SentinelUndef);
4832 else if (isa<ConstantSDNode>(Op)) {
4833 APInt MaskElement = cast<ConstantSDNode>(Op)->getAPIntValue();
4834 RawMask.push_back(MaskElement.getLoBits(MaskLoBits).getZExtValue());
4838 DecodeVPERMVMask(RawMask, Mask);
4841 if (MaskNode->getOpcode() == X86ISD::VBROADCAST) {
4842 unsigned NumEltsInMask = MaskNode->getNumOperands();
4843 MaskNode = MaskNode->getOperand(0);
4844 auto *CN = dyn_cast<ConstantSDNode>(MaskNode);
4846 APInt MaskEltValue = CN->getAPIntValue();
4847 for (unsigned i = 0; i < NumEltsInMask; ++i)
4848 RawMask.push_back(MaskEltValue.getLoBits(MaskLoBits).getZExtValue());
4849 DecodeVPERMVMask(RawMask, Mask);
4852 // It may be a scalar load
4855 auto *MaskLoad = dyn_cast<LoadSDNode>(MaskNode);
4859 SDValue Ptr = MaskLoad->getBasePtr();
4860 if (Ptr->getOpcode() == X86ISD::Wrapper ||
4861 Ptr->getOpcode() == X86ISD::WrapperRIP)
4862 Ptr = Ptr->getOperand(0);
4864 auto *MaskCP = dyn_cast<ConstantPoolSDNode>(Ptr);
4865 if (!MaskCP || MaskCP->isMachineConstantPoolEntry())
4868 auto *C = dyn_cast<Constant>(MaskCP->getConstVal());
4870 DecodeVPERMVMask(C, VT, Mask);
4877 case X86ISD::VPERMV3: {
4879 SDValue MaskNode = N->getOperand(1);
4880 while (MaskNode->getOpcode() == ISD::BITCAST)
4881 MaskNode = MaskNode->getOperand(1);
4883 if (MaskNode->getOpcode() == ISD::BUILD_VECTOR) {
4884 // If we have a build-vector, then things are easy.
4885 assert(MaskNode.getSimpleValueType().isInteger() &&
4886 MaskNode.getSimpleValueType().getVectorNumElements() ==
4887 VT.getVectorNumElements());
4889 SmallVector<uint64_t, 32> RawMask;
4890 unsigned MaskLoBits = Log2_64(VT.getVectorNumElements()*2);
4892 for (unsigned i = 0; i < MaskNode->getNumOperands(); ++i) {
4893 SDValue Op = MaskNode->getOperand(i);
4894 if (Op->getOpcode() == ISD::UNDEF)
4895 RawMask.push_back((uint64_t)SM_SentinelUndef);
4897 auto *CN = dyn_cast<ConstantSDNode>(Op.getNode());
4900 APInt MaskElement = CN->getAPIntValue();
4901 RawMask.push_back(MaskElement.getLoBits(MaskLoBits).getZExtValue());
4904 DecodeVPERMV3Mask(RawMask, Mask);
4908 auto *MaskLoad = dyn_cast<LoadSDNode>(MaskNode);
4912 SDValue Ptr = MaskLoad->getBasePtr();
4913 if (Ptr->getOpcode() == X86ISD::Wrapper ||
4914 Ptr->getOpcode() == X86ISD::WrapperRIP)
4915 Ptr = Ptr->getOperand(0);
4917 auto *MaskCP = dyn_cast<ConstantPoolSDNode>(Ptr);
4918 if (!MaskCP || MaskCP->isMachineConstantPoolEntry())
4921 auto *C = dyn_cast<Constant>(MaskCP->getConstVal());
4923 DecodeVPERMV3Mask(C, VT, Mask);
4930 default: llvm_unreachable("unknown target shuffle node");
4933 // If we have a fake unary shuffle, the shuffle mask is spread across two
4934 // inputs that are actually the same node. Re-map the mask to always point
4935 // into the first input.
4938 if (M >= (int)Mask.size())
4944 /// Returns the scalar element that will make up the ith
4945 /// element of the result of the vector shuffle.
4946 static SDValue getShuffleScalarElt(SDNode *N, unsigned Index, SelectionDAG &DAG,
4949 return SDValue(); // Limit search depth.
4951 SDValue V = SDValue(N, 0);
4952 EVT VT = V.getValueType();
4953 unsigned Opcode = V.getOpcode();
4955 // Recurse into ISD::VECTOR_SHUFFLE node to find scalars.
4956 if (const ShuffleVectorSDNode *SV = dyn_cast<ShuffleVectorSDNode>(N)) {
4957 int Elt = SV->getMaskElt(Index);
4960 return DAG.getUNDEF(VT.getVectorElementType());
4962 unsigned NumElems = VT.getVectorNumElements();
4963 SDValue NewV = (Elt < (int)NumElems) ? SV->getOperand(0)
4964 : SV->getOperand(1);
4965 return getShuffleScalarElt(NewV.getNode(), Elt % NumElems, DAG, Depth+1);
4968 // Recurse into target specific vector shuffles to find scalars.
4969 if (isTargetShuffle(Opcode)) {
4970 MVT ShufVT = V.getSimpleValueType();
4971 unsigned NumElems = ShufVT.getVectorNumElements();
4972 SmallVector<int, 16> ShuffleMask;
4975 if (!getTargetShuffleMask(N, ShufVT, ShuffleMask, IsUnary))
4978 int Elt = ShuffleMask[Index];
4980 return DAG.getUNDEF(ShufVT.getVectorElementType());
4982 SDValue NewV = (Elt < (int)NumElems) ? N->getOperand(0)
4984 return getShuffleScalarElt(NewV.getNode(), Elt % NumElems, DAG,
4988 // Actual nodes that may contain scalar elements
4989 if (Opcode == ISD::BITCAST) {
4990 V = V.getOperand(0);
4991 EVT SrcVT = V.getValueType();
4992 unsigned NumElems = VT.getVectorNumElements();
4994 if (!SrcVT.isVector() || SrcVT.getVectorNumElements() != NumElems)
4998 if (V.getOpcode() == ISD::SCALAR_TO_VECTOR)
4999 return (Index == 0) ? V.getOperand(0)
5000 : DAG.getUNDEF(VT.getVectorElementType());
5002 if (V.getOpcode() == ISD::BUILD_VECTOR)
5003 return V.getOperand(Index);
5008 /// Custom lower build_vector of v16i8.
5009 static SDValue LowerBuildVectorv16i8(SDValue Op, unsigned NonZeros,
5010 unsigned NumNonZero, unsigned NumZero,
5012 const X86Subtarget* Subtarget,
5013 const TargetLowering &TLI) {
5021 // SSE4.1 - use PINSRB to insert each byte directly.
5022 if (Subtarget->hasSSE41()) {
5023 for (unsigned i = 0; i < 16; ++i) {
5024 bool isNonZero = (NonZeros & (1 << i)) != 0;
5028 V = getZeroVector(MVT::v16i8, Subtarget, DAG, dl);
5030 V = DAG.getUNDEF(MVT::v16i8);
5033 V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl,
5034 MVT::v16i8, V, Op.getOperand(i),
5035 DAG.getIntPtrConstant(i, dl));
5042 // Pre-SSE4.1 - merge byte pairs and insert with PINSRW.
5043 for (unsigned i = 0; i < 16; ++i) {
5044 bool ThisIsNonZero = (NonZeros & (1 << i)) != 0;
5045 if (ThisIsNonZero && First) {
5047 V = getZeroVector(MVT::v8i16, Subtarget, DAG, dl);
5049 V = DAG.getUNDEF(MVT::v8i16);
5054 SDValue ThisElt, LastElt;
5055 bool LastIsNonZero = (NonZeros & (1 << (i-1))) != 0;
5056 if (LastIsNonZero) {
5057 LastElt = DAG.getNode(ISD::ZERO_EXTEND, dl,
5058 MVT::i16, Op.getOperand(i-1));
5060 if (ThisIsNonZero) {
5061 ThisElt = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i16, Op.getOperand(i));
5062 ThisElt = DAG.getNode(ISD::SHL, dl, MVT::i16,
5063 ThisElt, DAG.getConstant(8, dl, MVT::i8));
5065 ThisElt = DAG.getNode(ISD::OR, dl, MVT::i16, ThisElt, LastElt);
5069 if (ThisElt.getNode())
5070 V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v8i16, V, ThisElt,
5071 DAG.getIntPtrConstant(i/2, dl));
5075 return DAG.getBitcast(MVT::v16i8, V);
5078 /// Custom lower build_vector of v8i16.
5079 static SDValue LowerBuildVectorv8i16(SDValue Op, unsigned NonZeros,
5080 unsigned NumNonZero, unsigned NumZero,
5082 const X86Subtarget* Subtarget,
5083 const TargetLowering &TLI) {
5090 for (unsigned i = 0; i < 8; ++i) {
5091 bool isNonZero = (NonZeros & (1 << i)) != 0;
5095 V = getZeroVector(MVT::v8i16, Subtarget, DAG, dl);
5097 V = DAG.getUNDEF(MVT::v8i16);
5100 V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl,
5101 MVT::v8i16, V, Op.getOperand(i),
5102 DAG.getIntPtrConstant(i, dl));
5109 /// Custom lower build_vector of v4i32 or v4f32.
5110 static SDValue LowerBuildVectorv4x32(SDValue Op, SelectionDAG &DAG,
5111 const X86Subtarget *Subtarget,
5112 const TargetLowering &TLI) {
5113 // Find all zeroable elements.
5114 std::bitset<4> Zeroable;
5115 for (int i=0; i < 4; ++i) {
5116 SDValue Elt = Op->getOperand(i);
5117 Zeroable[i] = (Elt.getOpcode() == ISD::UNDEF || X86::isZeroNode(Elt));
5119 assert(Zeroable.size() - Zeroable.count() > 1 &&
5120 "We expect at least two non-zero elements!");
5122 // We only know how to deal with build_vector nodes where elements are either
5123 // zeroable or extract_vector_elt with constant index.
5124 SDValue FirstNonZero;
5125 unsigned FirstNonZeroIdx;
5126 for (unsigned i=0; i < 4; ++i) {
5129 SDValue Elt = Op->getOperand(i);
5130 if (Elt.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
5131 !isa<ConstantSDNode>(Elt.getOperand(1)))
5133 // Make sure that this node is extracting from a 128-bit vector.
5134 MVT VT = Elt.getOperand(0).getSimpleValueType();
5135 if (!VT.is128BitVector())
5137 if (!FirstNonZero.getNode()) {
5139 FirstNonZeroIdx = i;
5143 assert(FirstNonZero.getNode() && "Unexpected build vector of all zeros!");
5144 SDValue V1 = FirstNonZero.getOperand(0);
5145 MVT VT = V1.getSimpleValueType();
5147 // See if this build_vector can be lowered as a blend with zero.
5149 unsigned EltMaskIdx, EltIdx;
5151 for (EltIdx = 0; EltIdx < 4; ++EltIdx) {
5152 if (Zeroable[EltIdx]) {
5153 // The zero vector will be on the right hand side.
5154 Mask[EltIdx] = EltIdx+4;
5158 Elt = Op->getOperand(EltIdx);
5159 // By construction, Elt is a EXTRACT_VECTOR_ELT with constant index.
5160 EltMaskIdx = cast<ConstantSDNode>(Elt.getOperand(1))->getZExtValue();
5161 if (Elt.getOperand(0) != V1 || EltMaskIdx != EltIdx)
5163 Mask[EltIdx] = EltIdx;
5167 // Let the shuffle legalizer deal with blend operations.
5168 SDValue VZero = getZeroVector(VT, Subtarget, DAG, SDLoc(Op));
5169 if (V1.getSimpleValueType() != VT)
5170 V1 = DAG.getNode(ISD::BITCAST, SDLoc(V1), VT, V1);
5171 return DAG.getVectorShuffle(VT, SDLoc(V1), V1, VZero, &Mask[0]);
5174 // See if we can lower this build_vector to a INSERTPS.
5175 if (!Subtarget->hasSSE41())
5178 SDValue V2 = Elt.getOperand(0);
5179 if (Elt == FirstNonZero && EltIdx == FirstNonZeroIdx)
5182 bool CanFold = true;
5183 for (unsigned i = EltIdx + 1; i < 4 && CanFold; ++i) {
5187 SDValue Current = Op->getOperand(i);
5188 SDValue SrcVector = Current->getOperand(0);
5191 CanFold = SrcVector == V1 &&
5192 cast<ConstantSDNode>(Current.getOperand(1))->getZExtValue() == i;
5198 assert(V1.getNode() && "Expected at least two non-zero elements!");
5199 if (V1.getSimpleValueType() != MVT::v4f32)
5200 V1 = DAG.getNode(ISD::BITCAST, SDLoc(V1), MVT::v4f32, V1);
5201 if (V2.getSimpleValueType() != MVT::v4f32)
5202 V2 = DAG.getNode(ISD::BITCAST, SDLoc(V2), MVT::v4f32, V2);
5204 // Ok, we can emit an INSERTPS instruction.
5205 unsigned ZMask = Zeroable.to_ulong();
5207 unsigned InsertPSMask = EltMaskIdx << 6 | EltIdx << 4 | ZMask;
5208 assert((InsertPSMask & ~0xFFu) == 0 && "Invalid mask!");
5210 SDValue Result = DAG.getNode(X86ISD::INSERTPS, DL, MVT::v4f32, V1, V2,
5211 DAG.getIntPtrConstant(InsertPSMask, DL));
5212 return DAG.getBitcast(VT, Result);
5215 /// Return a vector logical shift node.
5216 static SDValue getVShift(bool isLeft, EVT VT, SDValue SrcOp,
5217 unsigned NumBits, SelectionDAG &DAG,
5218 const TargetLowering &TLI, SDLoc dl) {
5219 assert(VT.is128BitVector() && "Unknown type for VShift");
5220 MVT ShVT = MVT::v2i64;
5221 unsigned Opc = isLeft ? X86ISD::VSHLDQ : X86ISD::VSRLDQ;
5222 SrcOp = DAG.getBitcast(ShVT, SrcOp);
5223 MVT ScalarShiftTy = TLI.getScalarShiftAmountTy(DAG.getDataLayout(), VT);
5224 assert(NumBits % 8 == 0 && "Only support byte sized shifts");
5225 SDValue ShiftVal = DAG.getConstant(NumBits/8, dl, ScalarShiftTy);
5226 return DAG.getBitcast(VT, DAG.getNode(Opc, dl, ShVT, SrcOp, ShiftVal));
5230 LowerAsSplatVectorLoad(SDValue SrcOp, MVT VT, SDLoc dl, SelectionDAG &DAG) {
5232 // Check if the scalar load can be widened into a vector load. And if
5233 // the address is "base + cst" see if the cst can be "absorbed" into
5234 // the shuffle mask.
5235 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(SrcOp)) {
5236 SDValue Ptr = LD->getBasePtr();
5237 if (!ISD::isNormalLoad(LD) || LD->isVolatile())
5239 EVT PVT = LD->getValueType(0);
5240 if (PVT != MVT::i32 && PVT != MVT::f32)
5245 if (FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr)) {
5246 FI = FINode->getIndex();
5248 } else if (DAG.isBaseWithConstantOffset(Ptr) &&
5249 isa<FrameIndexSDNode>(Ptr.getOperand(0))) {
5250 FI = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
5251 Offset = Ptr.getConstantOperandVal(1);
5252 Ptr = Ptr.getOperand(0);
5257 // FIXME: 256-bit vector instructions don't require a strict alignment,
5258 // improve this code to support it better.
5259 unsigned RequiredAlign = VT.getSizeInBits()/8;
5260 SDValue Chain = LD->getChain();
5261 // Make sure the stack object alignment is at least 16 or 32.
5262 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
5263 if (DAG.InferPtrAlignment(Ptr) < RequiredAlign) {
5264 if (MFI->isFixedObjectIndex(FI)) {
5265 // Can't change the alignment. FIXME: It's possible to compute
5266 // the exact stack offset and reference FI + adjust offset instead.
5267 // If someone *really* cares about this. That's the way to implement it.
5270 MFI->setObjectAlignment(FI, RequiredAlign);
5274 // (Offset % 16 or 32) must be multiple of 4. Then address is then
5275 // Ptr + (Offset & ~15).
5278 if ((Offset % RequiredAlign) & 3)
5280 int64_t StartOffset = Offset & ~int64_t(RequiredAlign - 1);
5283 Ptr = DAG.getNode(ISD::ADD, DL, Ptr.getValueType(), Ptr,
5284 DAG.getConstant(StartOffset, DL, Ptr.getValueType()));
5287 int EltNo = (Offset - StartOffset) >> 2;
5288 unsigned NumElems = VT.getVectorNumElements();
5290 EVT NVT = EVT::getVectorVT(*DAG.getContext(), PVT, NumElems);
5291 SDValue V1 = DAG.getLoad(NVT, dl, Chain, Ptr,
5292 LD->getPointerInfo().getWithOffset(StartOffset),
5293 false, false, false, 0);
5295 SmallVector<int, 8> Mask(NumElems, EltNo);
5297 return DAG.getVectorShuffle(NVT, dl, V1, DAG.getUNDEF(NVT), &Mask[0]);
5303 /// Given the initializing elements 'Elts' of a vector of type 'VT', see if the
5304 /// elements can be replaced by a single large load which has the same value as
5305 /// a build_vector or insert_subvector whose loaded operands are 'Elts'.
5307 /// Example: <load i32 *a, load i32 *a+4, undef, undef> -> zextload a
5309 /// FIXME: we'd also like to handle the case where the last elements are zero
5310 /// rather than undef via VZEXT_LOAD, but we do not detect that case today.
5311 /// There's even a handy isZeroNode for that purpose.
5312 static SDValue EltsFromConsecutiveLoads(EVT VT, ArrayRef<SDValue> Elts,
5313 SDLoc &DL, SelectionDAG &DAG,
5314 bool isAfterLegalize) {
5315 unsigned NumElems = Elts.size();
5317 LoadSDNode *LDBase = nullptr;
5318 unsigned LastLoadedElt = -1U;
5320 // For each element in the initializer, see if we've found a load or an undef.
5321 // If we don't find an initial load element, or later load elements are
5322 // non-consecutive, bail out.
5323 for (unsigned i = 0; i < NumElems; ++i) {
5324 SDValue Elt = Elts[i];
5325 // Look through a bitcast.
5326 if (Elt.getNode() && Elt.getOpcode() == ISD::BITCAST)
5327 Elt = Elt.getOperand(0);
5328 if (!Elt.getNode() ||
5329 (Elt.getOpcode() != ISD::UNDEF && !ISD::isNON_EXTLoad(Elt.getNode())))
5332 if (Elt.getNode()->getOpcode() == ISD::UNDEF)
5334 LDBase = cast<LoadSDNode>(Elt.getNode());
5338 if (Elt.getOpcode() == ISD::UNDEF)
5341 LoadSDNode *LD = cast<LoadSDNode>(Elt);
5342 EVT LdVT = Elt.getValueType();
5343 // Each loaded element must be the correct fractional portion of the
5344 // requested vector load.
5345 if (LdVT.getSizeInBits() != VT.getSizeInBits() / NumElems)
5347 if (!DAG.isConsecutiveLoad(LD, LDBase, LdVT.getSizeInBits() / 8, i))
5352 // If we have found an entire vector of loads and undefs, then return a large
5353 // load of the entire vector width starting at the base pointer. If we found
5354 // consecutive loads for the low half, generate a vzext_load node.
5355 if (LastLoadedElt == NumElems - 1) {
5356 assert(LDBase && "Did not find base load for merging consecutive loads");
5357 EVT EltVT = LDBase->getValueType(0);
5358 // Ensure that the input vector size for the merged loads matches the
5359 // cumulative size of the input elements.
5360 if (VT.getSizeInBits() != EltVT.getSizeInBits() * NumElems)
5363 if (isAfterLegalize &&
5364 !DAG.getTargetLoweringInfo().isOperationLegal(ISD::LOAD, VT))
5367 SDValue NewLd = SDValue();
5369 NewLd = DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
5370 LDBase->getPointerInfo(), LDBase->isVolatile(),
5371 LDBase->isNonTemporal(), LDBase->isInvariant(),
5372 LDBase->getAlignment());
5374 if (LDBase->hasAnyUseOfValue(1)) {
5375 SDValue NewChain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other,
5377 SDValue(NewLd.getNode(), 1));
5378 DAG.ReplaceAllUsesOfValueWith(SDValue(LDBase, 1), NewChain);
5379 DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(LDBase, 1),
5380 SDValue(NewLd.getNode(), 1));
5386 //TODO: The code below fires only for for loading the low v2i32 / v2f32
5387 //of a v4i32 / v4f32. It's probably worth generalizing.
5388 EVT EltVT = VT.getVectorElementType();
5389 if (NumElems == 4 && LastLoadedElt == 1 && (EltVT.getSizeInBits() == 32) &&
5390 DAG.getTargetLoweringInfo().isTypeLegal(MVT::v2i64)) {
5391 SDVTList Tys = DAG.getVTList(MVT::v2i64, MVT::Other);
5392 SDValue Ops[] = { LDBase->getChain(), LDBase->getBasePtr() };
5394 DAG.getMemIntrinsicNode(X86ISD::VZEXT_LOAD, DL, Tys, Ops, MVT::i64,
5395 LDBase->getPointerInfo(),
5396 LDBase->getAlignment(),
5397 false/*isVolatile*/, true/*ReadMem*/,
5400 // Make sure the newly-created LOAD is in the same position as LDBase in
5401 // terms of dependency. We create a TokenFactor for LDBase and ResNode, and
5402 // update uses of LDBase's output chain to use the TokenFactor.
5403 if (LDBase->hasAnyUseOfValue(1)) {
5404 SDValue NewChain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other,
5405 SDValue(LDBase, 1), SDValue(ResNode.getNode(), 1));
5406 DAG.ReplaceAllUsesOfValueWith(SDValue(LDBase, 1), NewChain);
5407 DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(LDBase, 1),
5408 SDValue(ResNode.getNode(), 1));
5411 return DAG.getBitcast(VT, ResNode);
5416 /// LowerVectorBroadcast - Attempt to use the vbroadcast instruction
5417 /// to generate a splat value for the following cases:
5418 /// 1. A splat BUILD_VECTOR which uses a single scalar load, or a constant.
5419 /// 2. A splat shuffle which uses a scalar_to_vector node which comes from
5420 /// a scalar load, or a constant.
5421 /// The VBROADCAST node is returned when a pattern is found,
5422 /// or SDValue() otherwise.
5423 static SDValue LowerVectorBroadcast(SDValue Op, const X86Subtarget* Subtarget,
5424 SelectionDAG &DAG) {
5425 // VBROADCAST requires AVX.
5426 // TODO: Splats could be generated for non-AVX CPUs using SSE
5427 // instructions, but there's less potential gain for only 128-bit vectors.
5428 if (!Subtarget->hasAVX())
5431 MVT VT = Op.getSimpleValueType();
5434 assert((VT.is128BitVector() || VT.is256BitVector() || VT.is512BitVector()) &&
5435 "Unsupported vector type for broadcast.");
5440 switch (Op.getOpcode()) {
5442 // Unknown pattern found.
5445 case ISD::BUILD_VECTOR: {
5446 auto *BVOp = cast<BuildVectorSDNode>(Op.getNode());
5447 BitVector UndefElements;
5448 SDValue Splat = BVOp->getSplatValue(&UndefElements);
5450 // We need a splat of a single value to use broadcast, and it doesn't
5451 // make any sense if the value is only in one element of the vector.
5452 if (!Splat || (VT.getVectorNumElements() - UndefElements.count()) <= 1)
5456 ConstSplatVal = (Ld.getOpcode() == ISD::Constant ||
5457 Ld.getOpcode() == ISD::ConstantFP);
5459 // Make sure that all of the users of a non-constant load are from the
5460 // BUILD_VECTOR node.
5461 if (!ConstSplatVal && !BVOp->isOnlyUserOf(Ld.getNode()))
5466 case ISD::VECTOR_SHUFFLE: {
5467 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
5469 // Shuffles must have a splat mask where the first element is
5471 if ((!SVOp->isSplat()) || SVOp->getMaskElt(0) != 0)
5474 SDValue Sc = Op.getOperand(0);
5475 if (Sc.getOpcode() != ISD::SCALAR_TO_VECTOR &&
5476 Sc.getOpcode() != ISD::BUILD_VECTOR) {
5478 if (!Subtarget->hasInt256())
5481 // Use the register form of the broadcast instruction available on AVX2.
5482 if (VT.getSizeInBits() >= 256)
5483 Sc = Extract128BitVector(Sc, 0, DAG, dl);
5484 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Sc);
5487 Ld = Sc.getOperand(0);
5488 ConstSplatVal = (Ld.getOpcode() == ISD::Constant ||
5489 Ld.getOpcode() == ISD::ConstantFP);
5491 // The scalar_to_vector node and the suspected
5492 // load node must have exactly one user.
5493 // Constants may have multiple users.
5495 // AVX-512 has register version of the broadcast
5496 bool hasRegVer = Subtarget->hasAVX512() && VT.is512BitVector() &&
5497 Ld.getValueType().getSizeInBits() >= 32;
5498 if (!ConstSplatVal && ((!Sc.hasOneUse() || !Ld.hasOneUse()) &&
5505 unsigned ScalarSize = Ld.getValueType().getSizeInBits();
5506 bool IsGE256 = (VT.getSizeInBits() >= 256);
5508 // When optimizing for size, generate up to 5 extra bytes for a broadcast
5509 // instruction to save 8 or more bytes of constant pool data.
5510 // TODO: If multiple splats are generated to load the same constant,
5511 // it may be detrimental to overall size. There needs to be a way to detect
5512 // that condition to know if this is truly a size win.
5513 bool OptForSize = DAG.getMachineFunction().getFunction()->optForSize();
5515 // Handle broadcasting a single constant scalar from the constant pool
5517 // On Sandybridge (no AVX2), it is still better to load a constant vector
5518 // from the constant pool and not to broadcast it from a scalar.
5519 // But override that restriction when optimizing for size.
5520 // TODO: Check if splatting is recommended for other AVX-capable CPUs.
5521 if (ConstSplatVal && (Subtarget->hasAVX2() || OptForSize)) {
5522 EVT CVT = Ld.getValueType();
5523 assert(!CVT.isVector() && "Must not broadcast a vector type");
5525 // Splat f32, i32, v4f64, v4i64 in all cases with AVX2.
5526 // For size optimization, also splat v2f64 and v2i64, and for size opt
5527 // with AVX2, also splat i8 and i16.
5528 // With pattern matching, the VBROADCAST node may become a VMOVDDUP.
5529 if (ScalarSize == 32 || (IsGE256 && ScalarSize == 64) ||
5530 (OptForSize && (ScalarSize == 64 || Subtarget->hasAVX2()))) {
5531 const Constant *C = nullptr;
5532 if (ConstantSDNode *CI = dyn_cast<ConstantSDNode>(Ld))
5533 C = CI->getConstantIntValue();
5534 else if (ConstantFPSDNode *CF = dyn_cast<ConstantFPSDNode>(Ld))
5535 C = CF->getConstantFPValue();
5537 assert(C && "Invalid constant type");
5539 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
5541 DAG.getConstantPool(C, TLI.getPointerTy(DAG.getDataLayout()));
5542 unsigned Alignment = cast<ConstantPoolSDNode>(CP)->getAlignment();
5544 CVT, dl, DAG.getEntryNode(), CP,
5545 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()), false,
5546 false, false, Alignment);
5548 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
5552 bool IsLoad = ISD::isNormalLoad(Ld.getNode());
5554 // Handle AVX2 in-register broadcasts.
5555 if (!IsLoad && Subtarget->hasInt256() &&
5556 (ScalarSize == 32 || (IsGE256 && ScalarSize == 64)))
5557 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
5559 // The scalar source must be a normal load.
5563 if (ScalarSize == 32 || (IsGE256 && ScalarSize == 64) ||
5564 (Subtarget->hasVLX() && ScalarSize == 64))
5565 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
5567 // The integer check is needed for the 64-bit into 128-bit so it doesn't match
5568 // double since there is no vbroadcastsd xmm
5569 if (Subtarget->hasInt256() && Ld.getValueType().isInteger()) {
5570 if (ScalarSize == 8 || ScalarSize == 16 || ScalarSize == 64)
5571 return DAG.getNode(X86ISD::VBROADCAST, dl, VT, Ld);
5574 // Unsupported broadcast.
5578 /// \brief For an EXTRACT_VECTOR_ELT with a constant index return the real
5579 /// underlying vector and index.
5581 /// Modifies \p ExtractedFromVec to the real vector and returns the real
5583 static int getUnderlyingExtractedFromVec(SDValue &ExtractedFromVec,
5585 int Idx = cast<ConstantSDNode>(ExtIdx)->getZExtValue();
5586 if (!isa<ShuffleVectorSDNode>(ExtractedFromVec))
5589 // For 256-bit vectors, LowerEXTRACT_VECTOR_ELT_SSE4 may have already
5591 // (extract_vector_elt (v8f32 %vreg1), Constant<6>)
5593 // (extract_vector_elt (vector_shuffle<2,u,u,u>
5594 // (extract_subvector (v8f32 %vreg0), Constant<4>),
5597 // In this case the vector is the extract_subvector expression and the index
5598 // is 2, as specified by the shuffle.
5599 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(ExtractedFromVec);
5600 SDValue ShuffleVec = SVOp->getOperand(0);
5601 MVT ShuffleVecVT = ShuffleVec.getSimpleValueType();
5602 assert(ShuffleVecVT.getVectorElementType() ==
5603 ExtractedFromVec.getSimpleValueType().getVectorElementType());
5605 int ShuffleIdx = SVOp->getMaskElt(Idx);
5606 if (isUndefOrInRange(ShuffleIdx, 0, ShuffleVecVT.getVectorNumElements())) {
5607 ExtractedFromVec = ShuffleVec;
5613 static SDValue buildFromShuffleMostly(SDValue Op, SelectionDAG &DAG) {
5614 MVT VT = Op.getSimpleValueType();
5616 // Skip if insert_vec_elt is not supported.
5617 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
5618 if (!TLI.isOperationLegalOrCustom(ISD::INSERT_VECTOR_ELT, VT))
5622 unsigned NumElems = Op.getNumOperands();
5626 SmallVector<unsigned, 4> InsertIndices;
5627 SmallVector<int, 8> Mask(NumElems, -1);
5629 for (unsigned i = 0; i != NumElems; ++i) {
5630 unsigned Opc = Op.getOperand(i).getOpcode();
5632 if (Opc == ISD::UNDEF)
5635 if (Opc != ISD::EXTRACT_VECTOR_ELT) {
5636 // Quit if more than 1 elements need inserting.
5637 if (InsertIndices.size() > 1)
5640 InsertIndices.push_back(i);
5644 SDValue ExtractedFromVec = Op.getOperand(i).getOperand(0);
5645 SDValue ExtIdx = Op.getOperand(i).getOperand(1);
5646 // Quit if non-constant index.
5647 if (!isa<ConstantSDNode>(ExtIdx))
5649 int Idx = getUnderlyingExtractedFromVec(ExtractedFromVec, ExtIdx);
5651 // Quit if extracted from vector of different type.
5652 if (ExtractedFromVec.getValueType() != VT)
5655 if (!VecIn1.getNode())
5656 VecIn1 = ExtractedFromVec;
5657 else if (VecIn1 != ExtractedFromVec) {
5658 if (!VecIn2.getNode())
5659 VecIn2 = ExtractedFromVec;
5660 else if (VecIn2 != ExtractedFromVec)
5661 // Quit if more than 2 vectors to shuffle
5665 if (ExtractedFromVec == VecIn1)
5667 else if (ExtractedFromVec == VecIn2)
5668 Mask[i] = Idx + NumElems;
5671 if (!VecIn1.getNode())
5674 VecIn2 = VecIn2.getNode() ? VecIn2 : DAG.getUNDEF(VT);
5675 SDValue NV = DAG.getVectorShuffle(VT, DL, VecIn1, VecIn2, &Mask[0]);
5676 for (unsigned i = 0, e = InsertIndices.size(); i != e; ++i) {
5677 unsigned Idx = InsertIndices[i];
5678 NV = DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, VT, NV, Op.getOperand(Idx),
5679 DAG.getIntPtrConstant(Idx, DL));
5685 static SDValue ConvertI1VectorToInteger(SDValue Op, SelectionDAG &DAG) {
5686 assert(ISD::isBuildVectorOfConstantSDNodes(Op.getNode()) &&
5687 Op.getScalarValueSizeInBits() == 1 &&
5688 "Can not convert non-constant vector");
5689 uint64_t Immediate = 0;
5690 for (unsigned idx = 0, e = Op.getNumOperands(); idx < e; ++idx) {
5691 SDValue In = Op.getOperand(idx);
5692 if (In.getOpcode() != ISD::UNDEF)
5693 Immediate |= cast<ConstantSDNode>(In)->getZExtValue() << idx;
5697 MVT::getIntegerVT(std::max((int)Op.getValueType().getSizeInBits(), 8));
5698 return DAG.getConstant(Immediate, dl, VT);
5700 // Lower BUILD_VECTOR operation for v8i1 and v16i1 types.
5702 X86TargetLowering::LowerBUILD_VECTORvXi1(SDValue Op, SelectionDAG &DAG) const {
5704 MVT VT = Op.getSimpleValueType();
5705 assert((VT.getVectorElementType() == MVT::i1) &&
5706 "Unexpected type in LowerBUILD_VECTORvXi1!");
5709 if (ISD::isBuildVectorAllZeros(Op.getNode())) {
5710 SDValue Cst = DAG.getTargetConstant(0, dl, MVT::i1);
5711 SmallVector<SDValue, 16> Ops(VT.getVectorNumElements(), Cst);
5712 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Ops);
5715 if (ISD::isBuildVectorAllOnes(Op.getNode())) {
5716 SDValue Cst = DAG.getTargetConstant(1, dl, MVT::i1);
5717 SmallVector<SDValue, 16> Ops(VT.getVectorNumElements(), Cst);
5718 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Ops);
5721 if (ISD::isBuildVectorOfConstantSDNodes(Op.getNode())) {
5722 SDValue Imm = ConvertI1VectorToInteger(Op, DAG);
5723 if (Imm.getValueSizeInBits() == VT.getSizeInBits())
5724 return DAG.getBitcast(VT, Imm);
5725 SDValue ExtVec = DAG.getBitcast(MVT::v8i1, Imm);
5726 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, ExtVec,
5727 DAG.getIntPtrConstant(0, dl));
5730 // Vector has one or more non-const elements
5731 uint64_t Immediate = 0;
5732 SmallVector<unsigned, 16> NonConstIdx;
5733 bool IsSplat = true;
5734 bool HasConstElts = false;
5736 for (unsigned idx = 0, e = Op.getNumOperands(); idx < e; ++idx) {
5737 SDValue In = Op.getOperand(idx);
5738 if (In.getOpcode() == ISD::UNDEF)
5740 if (!isa<ConstantSDNode>(In))
5741 NonConstIdx.push_back(idx);
5743 Immediate |= cast<ConstantSDNode>(In)->getZExtValue() << idx;
5744 HasConstElts = true;
5748 else if (In != Op.getOperand(SplatIdx))
5752 // for splat use " (select i1 splat_elt, all-ones, all-zeroes)"
5754 return DAG.getNode(ISD::SELECT, dl, VT, Op.getOperand(SplatIdx),
5755 DAG.getConstant(1, dl, VT),
5756 DAG.getConstant(0, dl, VT));
5758 // insert elements one by one
5762 MVT ImmVT = MVT::getIntegerVT(std::max((int)VT.getSizeInBits(), 8));
5763 Imm = DAG.getConstant(Immediate, dl, ImmVT);
5765 else if (HasConstElts)
5766 Imm = DAG.getConstant(0, dl, VT);
5768 Imm = DAG.getUNDEF(VT);
5769 if (Imm.getValueSizeInBits() == VT.getSizeInBits())
5770 DstVec = DAG.getBitcast(VT, Imm);
5772 SDValue ExtVec = DAG.getBitcast(MVT::v8i1, Imm);
5773 DstVec = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, ExtVec,
5774 DAG.getIntPtrConstant(0, dl));
5777 for (unsigned i = 0; i < NonConstIdx.size(); ++i) {
5778 unsigned InsertIdx = NonConstIdx[i];
5779 DstVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, DstVec,
5780 Op.getOperand(InsertIdx),
5781 DAG.getIntPtrConstant(InsertIdx, dl));
5786 /// \brief Return true if \p N implements a horizontal binop and return the
5787 /// operands for the horizontal binop into V0 and V1.
5789 /// This is a helper function of LowerToHorizontalOp().
5790 /// This function checks that the build_vector \p N in input implements a
5791 /// horizontal operation. Parameter \p Opcode defines the kind of horizontal
5792 /// operation to match.
5793 /// For example, if \p Opcode is equal to ISD::ADD, then this function
5794 /// checks if \p N implements a horizontal arithmetic add; if instead \p Opcode
5795 /// is equal to ISD::SUB, then this function checks if this is a horizontal
5798 /// This function only analyzes elements of \p N whose indices are
5799 /// in range [BaseIdx, LastIdx).
5800 static bool isHorizontalBinOp(const BuildVectorSDNode *N, unsigned Opcode,
5802 unsigned BaseIdx, unsigned LastIdx,
5803 SDValue &V0, SDValue &V1) {
5804 EVT VT = N->getValueType(0);
5806 assert(BaseIdx * 2 <= LastIdx && "Invalid Indices in input!");
5807 assert(VT.isVector() && VT.getVectorNumElements() >= LastIdx &&
5808 "Invalid Vector in input!");
5810 bool IsCommutable = (Opcode == ISD::ADD || Opcode == ISD::FADD);
5811 bool CanFold = true;
5812 unsigned ExpectedVExtractIdx = BaseIdx;
5813 unsigned NumElts = LastIdx - BaseIdx;
5814 V0 = DAG.getUNDEF(VT);
5815 V1 = DAG.getUNDEF(VT);
5817 // Check if N implements a horizontal binop.
5818 for (unsigned i = 0, e = NumElts; i != e && CanFold; ++i) {
5819 SDValue Op = N->getOperand(i + BaseIdx);
5822 if (Op->getOpcode() == ISD::UNDEF) {
5823 // Update the expected vector extract index.
5824 if (i * 2 == NumElts)
5825 ExpectedVExtractIdx = BaseIdx;
5826 ExpectedVExtractIdx += 2;
5830 CanFold = Op->getOpcode() == Opcode && Op->hasOneUse();
5835 SDValue Op0 = Op.getOperand(0);
5836 SDValue Op1 = Op.getOperand(1);
5838 // Try to match the following pattern:
5839 // (BINOP (extract_vector_elt A, I), (extract_vector_elt A, I+1))
5840 CanFold = (Op0.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
5841 Op1.getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
5842 Op0.getOperand(0) == Op1.getOperand(0) &&
5843 isa<ConstantSDNode>(Op0.getOperand(1)) &&
5844 isa<ConstantSDNode>(Op1.getOperand(1)));
5848 unsigned I0 = cast<ConstantSDNode>(Op0.getOperand(1))->getZExtValue();
5849 unsigned I1 = cast<ConstantSDNode>(Op1.getOperand(1))->getZExtValue();
5851 if (i * 2 < NumElts) {
5852 if (V0.getOpcode() == ISD::UNDEF) {
5853 V0 = Op0.getOperand(0);
5854 if (V0.getValueType() != VT)
5858 if (V1.getOpcode() == ISD::UNDEF) {
5859 V1 = Op0.getOperand(0);
5860 if (V1.getValueType() != VT)
5863 if (i * 2 == NumElts)
5864 ExpectedVExtractIdx = BaseIdx;
5867 SDValue Expected = (i * 2 < NumElts) ? V0 : V1;
5868 if (I0 == ExpectedVExtractIdx)
5869 CanFold = I1 == I0 + 1 && Op0.getOperand(0) == Expected;
5870 else if (IsCommutable && I1 == ExpectedVExtractIdx) {
5871 // Try to match the following dag sequence:
5872 // (BINOP (extract_vector_elt A, I+1), (extract_vector_elt A, I))
5873 CanFold = I0 == I1 + 1 && Op1.getOperand(0) == Expected;
5877 ExpectedVExtractIdx += 2;
5883 /// \brief Emit a sequence of two 128-bit horizontal add/sub followed by
5884 /// a concat_vector.
5886 /// This is a helper function of LowerToHorizontalOp().
5887 /// This function expects two 256-bit vectors called V0 and V1.
5888 /// At first, each vector is split into two separate 128-bit vectors.
5889 /// Then, the resulting 128-bit vectors are used to implement two
5890 /// horizontal binary operations.
5892 /// The kind of horizontal binary operation is defined by \p X86Opcode.
5894 /// \p Mode specifies how the 128-bit parts of V0 and V1 are passed in input to
5895 /// the two new horizontal binop.
5896 /// When Mode is set, the first horizontal binop dag node would take as input
5897 /// the lower 128-bit of V0 and the upper 128-bit of V0. The second
5898 /// horizontal binop dag node would take as input the lower 128-bit of V1
5899 /// and the upper 128-bit of V1.
5901 /// HADD V0_LO, V0_HI
5902 /// HADD V1_LO, V1_HI
5904 /// Otherwise, the first horizontal binop dag node takes as input the lower
5905 /// 128-bit of V0 and the lower 128-bit of V1, and the second horizontal binop
5906 /// dag node takes the upper 128-bit of V0 and the upper 128-bit of V1.
5908 /// HADD V0_LO, V1_LO
5909 /// HADD V0_HI, V1_HI
5911 /// If \p isUndefLO is set, then the algorithm propagates UNDEF to the lower
5912 /// 128-bits of the result. If \p isUndefHI is set, then UNDEF is propagated to
5913 /// the upper 128-bits of the result.
5914 static SDValue ExpandHorizontalBinOp(const SDValue &V0, const SDValue &V1,
5915 SDLoc DL, SelectionDAG &DAG,
5916 unsigned X86Opcode, bool Mode,
5917 bool isUndefLO, bool isUndefHI) {
5918 EVT VT = V0.getValueType();
5919 assert(VT.is256BitVector() && VT == V1.getValueType() &&
5920 "Invalid nodes in input!");
5922 unsigned NumElts = VT.getVectorNumElements();
5923 SDValue V0_LO = Extract128BitVector(V0, 0, DAG, DL);
5924 SDValue V0_HI = Extract128BitVector(V0, NumElts/2, DAG, DL);
5925 SDValue V1_LO = Extract128BitVector(V1, 0, DAG, DL);
5926 SDValue V1_HI = Extract128BitVector(V1, NumElts/2, DAG, DL);
5927 EVT NewVT = V0_LO.getValueType();
5929 SDValue LO = DAG.getUNDEF(NewVT);
5930 SDValue HI = DAG.getUNDEF(NewVT);
5933 // Don't emit a horizontal binop if the result is expected to be UNDEF.
5934 if (!isUndefLO && V0->getOpcode() != ISD::UNDEF)
5935 LO = DAG.getNode(X86Opcode, DL, NewVT, V0_LO, V0_HI);
5936 if (!isUndefHI && V1->getOpcode() != ISD::UNDEF)
5937 HI = DAG.getNode(X86Opcode, DL, NewVT, V1_LO, V1_HI);
5939 // Don't emit a horizontal binop if the result is expected to be UNDEF.
5940 if (!isUndefLO && (V0_LO->getOpcode() != ISD::UNDEF ||
5941 V1_LO->getOpcode() != ISD::UNDEF))
5942 LO = DAG.getNode(X86Opcode, DL, NewVT, V0_LO, V1_LO);
5944 if (!isUndefHI && (V0_HI->getOpcode() != ISD::UNDEF ||
5945 V1_HI->getOpcode() != ISD::UNDEF))
5946 HI = DAG.getNode(X86Opcode, DL, NewVT, V0_HI, V1_HI);
5949 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, LO, HI);
5952 /// Try to fold a build_vector that performs an 'addsub' to an X86ISD::ADDSUB
5954 static SDValue LowerToAddSub(const BuildVectorSDNode *BV,
5955 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
5956 MVT VT = BV->getSimpleValueType(0);
5957 if ((!Subtarget->hasSSE3() || (VT != MVT::v4f32 && VT != MVT::v2f64)) &&
5958 (!Subtarget->hasAVX() || (VT != MVT::v8f32 && VT != MVT::v4f64)))
5962 unsigned NumElts = VT.getVectorNumElements();
5963 SDValue InVec0 = DAG.getUNDEF(VT);
5964 SDValue InVec1 = DAG.getUNDEF(VT);
5966 assert((VT == MVT::v8f32 || VT == MVT::v4f64 || VT == MVT::v4f32 ||
5967 VT == MVT::v2f64) && "build_vector with an invalid type found!");
5969 // Odd-numbered elements in the input build vector are obtained from
5970 // adding two integer/float elements.
5971 // Even-numbered elements in the input build vector are obtained from
5972 // subtracting two integer/float elements.
5973 unsigned ExpectedOpcode = ISD::FSUB;
5974 unsigned NextExpectedOpcode = ISD::FADD;
5975 bool AddFound = false;
5976 bool SubFound = false;
5978 for (unsigned i = 0, e = NumElts; i != e; ++i) {
5979 SDValue Op = BV->getOperand(i);
5981 // Skip 'undef' values.
5982 unsigned Opcode = Op.getOpcode();
5983 if (Opcode == ISD::UNDEF) {
5984 std::swap(ExpectedOpcode, NextExpectedOpcode);
5988 // Early exit if we found an unexpected opcode.
5989 if (Opcode != ExpectedOpcode)
5992 SDValue Op0 = Op.getOperand(0);
5993 SDValue Op1 = Op.getOperand(1);
5995 // Try to match the following pattern:
5996 // (BINOP (extract_vector_elt A, i), (extract_vector_elt B, i))
5997 // Early exit if we cannot match that sequence.
5998 if (Op0.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
5999 Op1.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
6000 !isa<ConstantSDNode>(Op0.getOperand(1)) ||
6001 !isa<ConstantSDNode>(Op1.getOperand(1)) ||
6002 Op0.getOperand(1) != Op1.getOperand(1))
6005 unsigned I0 = cast<ConstantSDNode>(Op0.getOperand(1))->getZExtValue();
6009 // We found a valid add/sub node. Update the information accordingly.
6015 // Update InVec0 and InVec1.
6016 if (InVec0.getOpcode() == ISD::UNDEF) {
6017 InVec0 = Op0.getOperand(0);
6018 if (InVec0.getSimpleValueType() != VT)
6021 if (InVec1.getOpcode() == ISD::UNDEF) {
6022 InVec1 = Op1.getOperand(0);
6023 if (InVec1.getSimpleValueType() != VT)
6027 // Make sure that operands in input to each add/sub node always
6028 // come from a same pair of vectors.
6029 if (InVec0 != Op0.getOperand(0)) {
6030 if (ExpectedOpcode == ISD::FSUB)
6033 // FADD is commutable. Try to commute the operands
6034 // and then test again.
6035 std::swap(Op0, Op1);
6036 if (InVec0 != Op0.getOperand(0))
6040 if (InVec1 != Op1.getOperand(0))
6043 // Update the pair of expected opcodes.
6044 std::swap(ExpectedOpcode, NextExpectedOpcode);
6047 // Don't try to fold this build_vector into an ADDSUB if the inputs are undef.
6048 if (AddFound && SubFound && InVec0.getOpcode() != ISD::UNDEF &&
6049 InVec1.getOpcode() != ISD::UNDEF)
6050 return DAG.getNode(X86ISD::ADDSUB, DL, VT, InVec0, InVec1);
6055 /// Lower BUILD_VECTOR to a horizontal add/sub operation if possible.
6056 static SDValue LowerToHorizontalOp(const BuildVectorSDNode *BV,
6057 const X86Subtarget *Subtarget,
6058 SelectionDAG &DAG) {
6059 MVT VT = BV->getSimpleValueType(0);
6060 unsigned NumElts = VT.getVectorNumElements();
6061 unsigned NumUndefsLO = 0;
6062 unsigned NumUndefsHI = 0;
6063 unsigned Half = NumElts/2;
6065 // Count the number of UNDEF operands in the build_vector in input.
6066 for (unsigned i = 0, e = Half; i != e; ++i)
6067 if (BV->getOperand(i)->getOpcode() == ISD::UNDEF)
6070 for (unsigned i = Half, e = NumElts; i != e; ++i)
6071 if (BV->getOperand(i)->getOpcode() == ISD::UNDEF)
6074 // Early exit if this is either a build_vector of all UNDEFs or all the
6075 // operands but one are UNDEF.
6076 if (NumUndefsLO + NumUndefsHI + 1 >= NumElts)
6080 SDValue InVec0, InVec1;
6081 if ((VT == MVT::v4f32 || VT == MVT::v2f64) && Subtarget->hasSSE3()) {
6082 // Try to match an SSE3 float HADD/HSUB.
6083 if (isHorizontalBinOp(BV, ISD::FADD, DAG, 0, NumElts, InVec0, InVec1))
6084 return DAG.getNode(X86ISD::FHADD, DL, VT, InVec0, InVec1);
6086 if (isHorizontalBinOp(BV, ISD::FSUB, DAG, 0, NumElts, InVec0, InVec1))
6087 return DAG.getNode(X86ISD::FHSUB, DL, VT, InVec0, InVec1);
6088 } else if ((VT == MVT::v4i32 || VT == MVT::v8i16) && Subtarget->hasSSSE3()) {
6089 // Try to match an SSSE3 integer HADD/HSUB.
6090 if (isHorizontalBinOp(BV, ISD::ADD, DAG, 0, NumElts, InVec0, InVec1))
6091 return DAG.getNode(X86ISD::HADD, DL, VT, InVec0, InVec1);
6093 if (isHorizontalBinOp(BV, ISD::SUB, DAG, 0, NumElts, InVec0, InVec1))
6094 return DAG.getNode(X86ISD::HSUB, DL, VT, InVec0, InVec1);
6097 if (!Subtarget->hasAVX())
6100 if ((VT == MVT::v8f32 || VT == MVT::v4f64)) {
6101 // Try to match an AVX horizontal add/sub of packed single/double
6102 // precision floating point values from 256-bit vectors.
6103 SDValue InVec2, InVec3;
6104 if (isHorizontalBinOp(BV, ISD::FADD, DAG, 0, Half, InVec0, InVec1) &&
6105 isHorizontalBinOp(BV, ISD::FADD, DAG, Half, NumElts, InVec2, InVec3) &&
6106 ((InVec0.getOpcode() == ISD::UNDEF ||
6107 InVec2.getOpcode() == ISD::UNDEF) || InVec0 == InVec2) &&
6108 ((InVec1.getOpcode() == ISD::UNDEF ||
6109 InVec3.getOpcode() == ISD::UNDEF) || InVec1 == InVec3))
6110 return DAG.getNode(X86ISD::FHADD, DL, VT, InVec0, InVec1);
6112 if (isHorizontalBinOp(BV, ISD::FSUB, DAG, 0, Half, InVec0, InVec1) &&
6113 isHorizontalBinOp(BV, ISD::FSUB, DAG, Half, NumElts, InVec2, InVec3) &&
6114 ((InVec0.getOpcode() == ISD::UNDEF ||
6115 InVec2.getOpcode() == ISD::UNDEF) || InVec0 == InVec2) &&
6116 ((InVec1.getOpcode() == ISD::UNDEF ||
6117 InVec3.getOpcode() == ISD::UNDEF) || InVec1 == InVec3))
6118 return DAG.getNode(X86ISD::FHSUB, DL, VT, InVec0, InVec1);
6119 } else if (VT == MVT::v8i32 || VT == MVT::v16i16) {
6120 // Try to match an AVX2 horizontal add/sub of signed integers.
6121 SDValue InVec2, InVec3;
6123 bool CanFold = true;
6125 if (isHorizontalBinOp(BV, ISD::ADD, DAG, 0, Half, InVec0, InVec1) &&
6126 isHorizontalBinOp(BV, ISD::ADD, DAG, Half, NumElts, InVec2, InVec3) &&
6127 ((InVec0.getOpcode() == ISD::UNDEF ||
6128 InVec2.getOpcode() == ISD::UNDEF) || InVec0 == InVec2) &&
6129 ((InVec1.getOpcode() == ISD::UNDEF ||
6130 InVec3.getOpcode() == ISD::UNDEF) || InVec1 == InVec3))
6131 X86Opcode = X86ISD::HADD;
6132 else if (isHorizontalBinOp(BV, ISD::SUB, DAG, 0, Half, InVec0, InVec1) &&
6133 isHorizontalBinOp(BV, ISD::SUB, DAG, Half, NumElts, InVec2, InVec3) &&
6134 ((InVec0.getOpcode() == ISD::UNDEF ||
6135 InVec2.getOpcode() == ISD::UNDEF) || InVec0 == InVec2) &&
6136 ((InVec1.getOpcode() == ISD::UNDEF ||
6137 InVec3.getOpcode() == ISD::UNDEF) || InVec1 == InVec3))
6138 X86Opcode = X86ISD::HSUB;
6143 // Fold this build_vector into a single horizontal add/sub.
6144 // Do this only if the target has AVX2.
6145 if (Subtarget->hasAVX2())
6146 return DAG.getNode(X86Opcode, DL, VT, InVec0, InVec1);
6148 // Do not try to expand this build_vector into a pair of horizontal
6149 // add/sub if we can emit a pair of scalar add/sub.
6150 if (NumUndefsLO + 1 == Half || NumUndefsHI + 1 == Half)
6153 // Convert this build_vector into a pair of horizontal binop followed by
6155 bool isUndefLO = NumUndefsLO == Half;
6156 bool isUndefHI = NumUndefsHI == Half;
6157 return ExpandHorizontalBinOp(InVec0, InVec1, DL, DAG, X86Opcode, false,
6158 isUndefLO, isUndefHI);
6162 if ((VT == MVT::v8f32 || VT == MVT::v4f64 || VT == MVT::v8i32 ||
6163 VT == MVT::v16i16) && Subtarget->hasAVX()) {
6165 if (isHorizontalBinOp(BV, ISD::ADD, DAG, 0, NumElts, InVec0, InVec1))
6166 X86Opcode = X86ISD::HADD;
6167 else if (isHorizontalBinOp(BV, ISD::SUB, DAG, 0, NumElts, InVec0, InVec1))
6168 X86Opcode = X86ISD::HSUB;
6169 else if (isHorizontalBinOp(BV, ISD::FADD, DAG, 0, NumElts, InVec0, InVec1))
6170 X86Opcode = X86ISD::FHADD;
6171 else if (isHorizontalBinOp(BV, ISD::FSUB, DAG, 0, NumElts, InVec0, InVec1))
6172 X86Opcode = X86ISD::FHSUB;
6176 // Don't try to expand this build_vector into a pair of horizontal add/sub
6177 // if we can simply emit a pair of scalar add/sub.
6178 if (NumUndefsLO + 1 == Half || NumUndefsHI + 1 == Half)
6181 // Convert this build_vector into two horizontal add/sub followed by
6183 bool isUndefLO = NumUndefsLO == Half;
6184 bool isUndefHI = NumUndefsHI == Half;
6185 return ExpandHorizontalBinOp(InVec0, InVec1, DL, DAG, X86Opcode, true,
6186 isUndefLO, isUndefHI);
6193 X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
6196 MVT VT = Op.getSimpleValueType();
6197 MVT ExtVT = VT.getVectorElementType();
6198 unsigned NumElems = Op.getNumOperands();
6200 // Generate vectors for predicate vectors.
6201 if (VT.getVectorElementType() == MVT::i1 && Subtarget->hasAVX512())
6202 return LowerBUILD_VECTORvXi1(Op, DAG);
6204 // Vectors containing all zeros can be matched by pxor and xorps later
6205 if (ISD::isBuildVectorAllZeros(Op.getNode())) {
6206 // Canonicalize this to <4 x i32> to 1) ensure the zero vectors are CSE'd
6207 // and 2) ensure that i64 scalars are eliminated on x86-32 hosts.
6208 if (VT == MVT::v4i32 || VT == MVT::v8i32 || VT == MVT::v16i32)
6211 return getZeroVector(VT, Subtarget, DAG, dl);
6214 // Vectors containing all ones can be matched by pcmpeqd on 128-bit width
6215 // vectors or broken into v4i32 operations on 256-bit vectors. AVX2 can use
6216 // vpcmpeqd on 256-bit vectors.
6217 if (Subtarget->hasSSE2() && ISD::isBuildVectorAllOnes(Op.getNode())) {
6218 if (VT == MVT::v4i32 || (VT == MVT::v8i32 && Subtarget->hasInt256()))
6221 if (!VT.is512BitVector())
6222 return getOnesVector(VT, Subtarget, DAG, dl);
6225 BuildVectorSDNode *BV = cast<BuildVectorSDNode>(Op.getNode());
6226 if (SDValue AddSub = LowerToAddSub(BV, Subtarget, DAG))
6228 if (SDValue HorizontalOp = LowerToHorizontalOp(BV, Subtarget, DAG))
6229 return HorizontalOp;
6230 if (SDValue Broadcast = LowerVectorBroadcast(Op, Subtarget, DAG))
6233 unsigned EVTBits = ExtVT.getSizeInBits();
6235 unsigned NumZero = 0;
6236 unsigned NumNonZero = 0;
6237 uint64_t NonZeros = 0;
6238 bool IsAllConstants = true;
6239 SmallSet<SDValue, 8> Values;
6240 for (unsigned i = 0; i < NumElems; ++i) {
6241 SDValue Elt = Op.getOperand(i);
6242 if (Elt.getOpcode() == ISD::UNDEF)
6245 if (Elt.getOpcode() != ISD::Constant &&
6246 Elt.getOpcode() != ISD::ConstantFP)
6247 IsAllConstants = false;
6248 if (X86::isZeroNode(Elt))
6251 assert(i < sizeof(NonZeros) * 8); // Make sure the shift is within range.
6252 NonZeros |= ((uint64_t)1 << i);
6257 // All undef vector. Return an UNDEF. All zero vectors were handled above.
6258 if (NumNonZero == 0)
6259 return DAG.getUNDEF(VT);
6261 // Special case for single non-zero, non-undef, element.
6262 if (NumNonZero == 1) {
6263 unsigned Idx = countTrailingZeros(NonZeros);
6264 SDValue Item = Op.getOperand(Idx);
6266 // If this is an insertion of an i64 value on x86-32, and if the top bits of
6267 // the value are obviously zero, truncate the value to i32 and do the
6268 // insertion that way. Only do this if the value is non-constant or if the
6269 // value is a constant being inserted into element 0. It is cheaper to do
6270 // a constant pool load than it is to do a movd + shuffle.
6271 if (ExtVT == MVT::i64 && !Subtarget->is64Bit() &&
6272 (!IsAllConstants || Idx == 0)) {
6273 if (DAG.MaskedValueIsZero(Item, APInt::getBitsSet(64, 32, 64))) {
6275 assert(VT == MVT::v2i64 && "Expected an SSE value type!");
6276 MVT VecVT = MVT::v4i32;
6278 // Truncate the value (which may itself be a constant) to i32, and
6279 // convert it to a vector with movd (S2V+shuffle to zero extend).
6280 Item = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Item);
6281 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VecVT, Item);
6282 return DAG.getBitcast(VT, getShuffleVectorZeroOrUndef(
6283 Item, Idx * 2, true, Subtarget, DAG));
6287 // If we have a constant or non-constant insertion into the low element of
6288 // a vector, we can do this with SCALAR_TO_VECTOR + shuffle of zero into
6289 // the rest of the elements. This will be matched as movd/movq/movss/movsd
6290 // depending on what the source datatype is.
6293 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
6295 if (ExtVT == MVT::i32 || ExtVT == MVT::f32 || ExtVT == MVT::f64 ||
6296 (ExtVT == MVT::i64 && Subtarget->is64Bit())) {
6297 if (VT.is512BitVector()) {
6298 SDValue ZeroVec = getZeroVector(VT, Subtarget, DAG, dl);
6299 return DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, ZeroVec,
6300 Item, DAG.getIntPtrConstant(0, dl));
6302 assert((VT.is128BitVector() || VT.is256BitVector()) &&
6303 "Expected an SSE value type!");
6304 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
6305 // Turn it into a MOVL (i.e. movss, movsd, or movd) to a zero vector.
6306 return getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
6309 // We can't directly insert an i8 or i16 into a vector, so zero extend
6311 if (ExtVT == MVT::i16 || ExtVT == MVT::i8) {
6312 Item = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Item);
6313 if (VT.is256BitVector()) {
6314 if (Subtarget->hasAVX()) {
6315 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v8i32, Item);
6316 Item = getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
6318 // Without AVX, we need to extend to a 128-bit vector and then
6319 // insert into the 256-bit vector.
6320 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32, Item);
6321 SDValue ZeroVec = getZeroVector(MVT::v8i32, Subtarget, DAG, dl);
6322 Item = Insert128BitVector(ZeroVec, Item, 0, DAG, dl);
6325 assert(VT.is128BitVector() && "Expected an SSE value type!");
6326 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32, Item);
6327 Item = getShuffleVectorZeroOrUndef(Item, 0, true, Subtarget, DAG);
6329 return DAG.getBitcast(VT, Item);
6333 // Is it a vector logical left shift?
6334 if (NumElems == 2 && Idx == 1 &&
6335 X86::isZeroNode(Op.getOperand(0)) &&
6336 !X86::isZeroNode(Op.getOperand(1))) {
6337 unsigned NumBits = VT.getSizeInBits();
6338 return getVShift(true, VT,
6339 DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
6340 VT, Op.getOperand(1)),
6341 NumBits/2, DAG, *this, dl);
6344 if (IsAllConstants) // Otherwise, it's better to do a constpool load.
6347 // Otherwise, if this is a vector with i32 or f32 elements, and the element
6348 // is a non-constant being inserted into an element other than the low one,
6349 // we can't use a constant pool load. Instead, use SCALAR_TO_VECTOR (aka
6350 // movd/movss) to move this into the low element, then shuffle it into
6352 if (EVTBits == 32) {
6353 Item = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Item);
6354 return getShuffleVectorZeroOrUndef(Item, Idx, NumZero > 0, Subtarget, DAG);
6358 // Splat is obviously ok. Let legalizer expand it to a shuffle.
6359 if (Values.size() == 1) {
6360 if (EVTBits == 32) {
6361 // Instead of a shuffle like this:
6362 // shuffle (scalar_to_vector (load (ptr + 4))), undef, <0, 0, 0, 0>
6363 // Check if it's possible to issue this instead.
6364 // shuffle (vload ptr)), undef, <1, 1, 1, 1>
6365 unsigned Idx = countTrailingZeros(NonZeros);
6366 SDValue Item = Op.getOperand(Idx);
6367 if (Op.getNode()->isOnlyUserOf(Item.getNode()))
6368 return LowerAsSplatVectorLoad(Item, VT, dl, DAG);
6373 // A vector full of immediates; various special cases are already
6374 // handled, so this is best done with a single constant-pool load.
6378 // For AVX-length vectors, see if we can use a vector load to get all of the
6379 // elements, otherwise build the individual 128-bit pieces and use
6380 // shuffles to put them in place.
6381 if (VT.is256BitVector() || VT.is512BitVector()) {
6382 SmallVector<SDValue, 64> V(Op->op_begin(), Op->op_begin() + NumElems);
6384 // Check for a build vector of consecutive loads.
6385 if (SDValue LD = EltsFromConsecutiveLoads(VT, V, dl, DAG, false))
6388 EVT HVT = EVT::getVectorVT(*DAG.getContext(), ExtVT, NumElems/2);
6390 // Build both the lower and upper subvector.
6391 SDValue Lower = DAG.getNode(ISD::BUILD_VECTOR, dl, HVT,
6392 makeArrayRef(&V[0], NumElems/2));
6393 SDValue Upper = DAG.getNode(ISD::BUILD_VECTOR, dl, HVT,
6394 makeArrayRef(&V[NumElems / 2], NumElems/2));
6396 // Recreate the wider vector with the lower and upper part.
6397 if (VT.is256BitVector())
6398 return Concat128BitVectors(Lower, Upper, VT, NumElems, DAG, dl);
6399 return Concat256BitVectors(Lower, Upper, VT, NumElems, DAG, dl);
6402 // Let legalizer expand 2-wide build_vectors.
6403 if (EVTBits == 64) {
6404 if (NumNonZero == 1) {
6405 // One half is zero or undef.
6406 unsigned Idx = countTrailingZeros(NonZeros);
6407 SDValue V2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT,
6408 Op.getOperand(Idx));
6409 return getShuffleVectorZeroOrUndef(V2, Idx, true, Subtarget, DAG);
6414 // If element VT is < 32 bits, convert it to inserts into a zero vector.
6415 if (EVTBits == 8 && NumElems == 16)
6416 if (SDValue V = LowerBuildVectorv16i8(Op, NonZeros, NumNonZero, NumZero,
6417 DAG, Subtarget, *this))
6420 if (EVTBits == 16 && NumElems == 8)
6421 if (SDValue V = LowerBuildVectorv8i16(Op, NonZeros, NumNonZero, NumZero,
6422 DAG, Subtarget, *this))
6425 // If element VT is == 32 bits and has 4 elems, try to generate an INSERTPS
6426 if (EVTBits == 32 && NumElems == 4)
6427 if (SDValue V = LowerBuildVectorv4x32(Op, DAG, Subtarget, *this))
6430 // If element VT is == 32 bits, turn it into a number of shuffles.
6431 SmallVector<SDValue, 8> V(NumElems);
6432 if (NumElems == 4 && NumZero > 0) {
6433 for (unsigned i = 0; i < 4; ++i) {
6434 bool isZero = !(NonZeros & (1ULL << i));
6436 V[i] = getZeroVector(VT, Subtarget, DAG, dl);
6438 V[i] = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(i));
6441 for (unsigned i = 0; i < 2; ++i) {
6442 switch ((NonZeros & (0x3 << i*2)) >> (i*2)) {
6445 V[i] = V[i*2]; // Must be a zero vector.
6448 V[i] = getMOVL(DAG, dl, VT, V[i*2+1], V[i*2]);
6451 V[i] = getMOVL(DAG, dl, VT, V[i*2], V[i*2+1]);
6454 V[i] = getUnpackl(DAG, dl, VT, V[i*2], V[i*2+1]);
6459 bool Reverse1 = (NonZeros & 0x3) == 2;
6460 bool Reverse2 = ((NonZeros & (0x3 << 2)) >> 2) == 2;
6464 static_cast<int>(Reverse2 ? NumElems+1 : NumElems),
6465 static_cast<int>(Reverse2 ? NumElems : NumElems+1)
6467 return DAG.getVectorShuffle(VT, dl, V[0], V[1], &MaskVec[0]);
6470 if (Values.size() > 1 && VT.is128BitVector()) {
6471 // Check for a build vector of consecutive loads.
6472 for (unsigned i = 0; i < NumElems; ++i)
6473 V[i] = Op.getOperand(i);
6475 // Check for elements which are consecutive loads.
6476 if (SDValue LD = EltsFromConsecutiveLoads(VT, V, dl, DAG, false))
6479 // Check for a build vector from mostly shuffle plus few inserting.
6480 if (SDValue Sh = buildFromShuffleMostly(Op, DAG))
6483 // For SSE 4.1, use insertps to put the high elements into the low element.
6484 if (Subtarget->hasSSE41()) {
6486 if (Op.getOperand(0).getOpcode() != ISD::UNDEF)
6487 Result = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(0));
6489 Result = DAG.getUNDEF(VT);
6491 for (unsigned i = 1; i < NumElems; ++i) {
6492 if (Op.getOperand(i).getOpcode() == ISD::UNDEF) continue;
6493 Result = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Result,
6494 Op.getOperand(i), DAG.getIntPtrConstant(i, dl));
6499 // Otherwise, expand into a number of unpckl*, start by extending each of
6500 // our (non-undef) elements to the full vector width with the element in the
6501 // bottom slot of the vector (which generates no code for SSE).
6502 for (unsigned i = 0; i < NumElems; ++i) {
6503 if (Op.getOperand(i).getOpcode() != ISD::UNDEF)
6504 V[i] = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Op.getOperand(i));
6506 V[i] = DAG.getUNDEF(VT);
6509 // Next, we iteratively mix elements, e.g. for v4f32:
6510 // Step 1: unpcklps 0, 2 ==> X: <?, ?, 2, 0>
6511 // : unpcklps 1, 3 ==> Y: <?, ?, 3, 1>
6512 // Step 2: unpcklps X, Y ==> <3, 2, 1, 0>
6513 unsigned EltStride = NumElems >> 1;
6514 while (EltStride != 0) {
6515 for (unsigned i = 0; i < EltStride; ++i) {
6516 // If V[i+EltStride] is undef and this is the first round of mixing,
6517 // then it is safe to just drop this shuffle: V[i] is already in the
6518 // right place, the one element (since it's the first round) being
6519 // inserted as undef can be dropped. This isn't safe for successive
6520 // rounds because they will permute elements within both vectors.
6521 if (V[i+EltStride].getOpcode() == ISD::UNDEF &&
6522 EltStride == NumElems/2)
6525 V[i] = getUnpackl(DAG, dl, VT, V[i], V[i + EltStride]);
6534 // 256-bit AVX can use the vinsertf128 instruction
6535 // to create 256-bit vectors from two other 128-bit ones.
6536 static SDValue LowerAVXCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
6538 MVT ResVT = Op.getSimpleValueType();
6540 assert((ResVT.is256BitVector() ||
6541 ResVT.is512BitVector()) && "Value type must be 256-/512-bit wide");
6543 SDValue V1 = Op.getOperand(0);
6544 SDValue V2 = Op.getOperand(1);
6545 unsigned NumElems = ResVT.getVectorNumElements();
6546 if (ResVT.is256BitVector())
6547 return Concat128BitVectors(V1, V2, ResVT, NumElems, DAG, dl);
6549 if (Op.getNumOperands() == 4) {
6550 MVT HalfVT = MVT::getVectorVT(ResVT.getVectorElementType(),
6551 ResVT.getVectorNumElements()/2);
6552 SDValue V3 = Op.getOperand(2);
6553 SDValue V4 = Op.getOperand(3);
6554 return Concat256BitVectors(Concat128BitVectors(V1, V2, HalfVT, NumElems/2, DAG, dl),
6555 Concat128BitVectors(V3, V4, HalfVT, NumElems/2, DAG, dl), ResVT, NumElems, DAG, dl);
6557 return Concat256BitVectors(V1, V2, ResVT, NumElems, DAG, dl);
6560 static SDValue LowerCONCAT_VECTORSvXi1(SDValue Op,
6561 const X86Subtarget *Subtarget,
6562 SelectionDAG & DAG) {
6564 MVT ResVT = Op.getSimpleValueType();
6565 unsigned NumOfOperands = Op.getNumOperands();
6567 assert(isPowerOf2_32(NumOfOperands) &&
6568 "Unexpected number of operands in CONCAT_VECTORS");
6570 SDValue Undef = DAG.getUNDEF(ResVT);
6571 if (NumOfOperands > 2) {
6572 // Specialize the cases when all, or all but one, of the operands are undef.
6573 unsigned NumOfDefinedOps = 0;
6575 for (unsigned i = 0; i < NumOfOperands; i++)
6576 if (!Op.getOperand(i).isUndef()) {
6580 if (NumOfDefinedOps == 0)
6582 if (NumOfDefinedOps == 1) {
6583 unsigned SubVecNumElts =
6584 Op.getOperand(OpIdx).getValueType().getVectorNumElements();
6585 SDValue IdxVal = DAG.getIntPtrConstant(SubVecNumElts * OpIdx, dl);
6586 return DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, Undef,
6587 Op.getOperand(OpIdx), IdxVal);
6590 MVT HalfVT = MVT::getVectorVT(ResVT.getVectorElementType(),
6591 ResVT.getVectorNumElements()/2);
6592 SmallVector<SDValue, 2> Ops;
6593 for (unsigned i = 0; i < NumOfOperands/2; i++)
6594 Ops.push_back(Op.getOperand(i));
6595 SDValue Lo = DAG.getNode(ISD::CONCAT_VECTORS, dl, HalfVT, Ops);
6597 for (unsigned i = NumOfOperands/2; i < NumOfOperands; i++)
6598 Ops.push_back(Op.getOperand(i));
6599 SDValue Hi = DAG.getNode(ISD::CONCAT_VECTORS, dl, HalfVT, Ops);
6600 return DAG.getNode(ISD::CONCAT_VECTORS, dl, ResVT, Lo, Hi);
6604 SDValue V1 = Op.getOperand(0);
6605 SDValue V2 = Op.getOperand(1);
6606 unsigned NumElems = ResVT.getVectorNumElements();
6607 assert(V1.getValueType() == V2.getValueType() &&
6608 V1.getValueType().getVectorNumElements() == NumElems/2 &&
6609 "Unexpected operands in CONCAT_VECTORS");
6611 if (ResVT.getSizeInBits() >= 16)
6612 return Op; // The operation is legal with KUNPCK
6614 bool IsZeroV1 = ISD::isBuildVectorAllZeros(V1.getNode());
6615 bool IsZeroV2 = ISD::isBuildVectorAllZeros(V2.getNode());
6616 SDValue ZeroVec = getZeroVector(ResVT, Subtarget, DAG, dl);
6617 if (IsZeroV1 && IsZeroV2)
6620 SDValue ZeroIdx = DAG.getIntPtrConstant(0, dl);
6622 return DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, Undef, V1, ZeroIdx);
6624 return DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, ZeroVec, V1, ZeroIdx);
6626 SDValue IdxVal = DAG.getIntPtrConstant(NumElems/2, dl);
6628 V2 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, Undef, V2, IdxVal);
6631 return DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, ZeroVec, V2, IdxVal);
6633 V1 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, Undef, V1, ZeroIdx);
6634 return DAG.getNode(ISD::INSERT_SUBVECTOR, dl, ResVT, V1, V2, IdxVal);
6637 static SDValue LowerCONCAT_VECTORS(SDValue Op,
6638 const X86Subtarget *Subtarget,
6639 SelectionDAG &DAG) {
6640 MVT VT = Op.getSimpleValueType();
6641 if (VT.getVectorElementType() == MVT::i1)
6642 return LowerCONCAT_VECTORSvXi1(Op, Subtarget, DAG);
6644 assert((VT.is256BitVector() && Op.getNumOperands() == 2) ||
6645 (VT.is512BitVector() && (Op.getNumOperands() == 2 ||
6646 Op.getNumOperands() == 4)));
6648 // AVX can use the vinsertf128 instruction to create 256-bit vectors
6649 // from two other 128-bit ones.
6651 // 512-bit vector may contain 2 256-bit vectors or 4 128-bit vectors
6652 return LowerAVXCONCAT_VECTORS(Op, DAG);
6655 //===----------------------------------------------------------------------===//
6656 // Vector shuffle lowering
6658 // This is an experimental code path for lowering vector shuffles on x86. It is
6659 // designed to handle arbitrary vector shuffles and blends, gracefully
6660 // degrading performance as necessary. It works hard to recognize idiomatic
6661 // shuffles and lower them to optimal instruction patterns without leaving
6662 // a framework that allows reasonably efficient handling of all vector shuffle
6664 //===----------------------------------------------------------------------===//
6666 /// \brief Tiny helper function to identify a no-op mask.
6668 /// This is a somewhat boring predicate function. It checks whether the mask
6669 /// array input, which is assumed to be a single-input shuffle mask of the kind
6670 /// used by the X86 shuffle instructions (not a fully general
6671 /// ShuffleVectorSDNode mask) requires any shuffles to occur. Both undef and an
6672 /// in-place shuffle are 'no-op's.
6673 static bool isNoopShuffleMask(ArrayRef<int> Mask) {
6674 for (int i = 0, Size = Mask.size(); i < Size; ++i)
6675 if (Mask[i] != -1 && Mask[i] != i)
6680 /// \brief Helper function to classify a mask as a single-input mask.
6682 /// This isn't a generic single-input test because in the vector shuffle
6683 /// lowering we canonicalize single inputs to be the first input operand. This
6684 /// means we can more quickly test for a single input by only checking whether
6685 /// an input from the second operand exists. We also assume that the size of
6686 /// mask corresponds to the size of the input vectors which isn't true in the
6687 /// fully general case.
6688 static bool isSingleInputShuffleMask(ArrayRef<int> Mask) {
6690 if (M >= (int)Mask.size())
6695 /// \brief Test whether there are elements crossing 128-bit lanes in this
6698 /// X86 divides up its shuffles into in-lane and cross-lane shuffle operations
6699 /// and we routinely test for these.
6700 static bool is128BitLaneCrossingShuffleMask(MVT VT, ArrayRef<int> Mask) {
6701 int LaneSize = 128 / VT.getScalarSizeInBits();
6702 int Size = Mask.size();
6703 for (int i = 0; i < Size; ++i)
6704 if (Mask[i] >= 0 && (Mask[i] % Size) / LaneSize != i / LaneSize)
6709 /// \brief Test whether a shuffle mask is equivalent within each 128-bit lane.
6711 /// This checks a shuffle mask to see if it is performing the same
6712 /// 128-bit lane-relative shuffle in each 128-bit lane. This trivially implies
6713 /// that it is also not lane-crossing. It may however involve a blend from the
6714 /// same lane of a second vector.
6716 /// The specific repeated shuffle mask is populated in \p RepeatedMask, as it is
6717 /// non-trivial to compute in the face of undef lanes. The representation is
6718 /// *not* suitable for use with existing 128-bit shuffles as it will contain
6719 /// entries from both V1 and V2 inputs to the wider mask.
6721 is128BitLaneRepeatedShuffleMask(MVT VT, ArrayRef<int> Mask,
6722 SmallVectorImpl<int> &RepeatedMask) {
6723 int LaneSize = 128 / VT.getScalarSizeInBits();
6724 RepeatedMask.resize(LaneSize, -1);
6725 int Size = Mask.size();
6726 for (int i = 0; i < Size; ++i) {
6729 if ((Mask[i] % Size) / LaneSize != i / LaneSize)
6730 // This entry crosses lanes, so there is no way to model this shuffle.
6733 // Ok, handle the in-lane shuffles by detecting if and when they repeat.
6734 if (RepeatedMask[i % LaneSize] == -1)
6735 // This is the first non-undef entry in this slot of a 128-bit lane.
6736 RepeatedMask[i % LaneSize] =
6737 Mask[i] < Size ? Mask[i] % LaneSize : Mask[i] % LaneSize + Size;
6738 else if (RepeatedMask[i % LaneSize] + (i / LaneSize) * LaneSize != Mask[i])
6739 // Found a mismatch with the repeated mask.
6745 /// \brief Checks whether a shuffle mask is equivalent to an explicit list of
6748 /// This is a fast way to test a shuffle mask against a fixed pattern:
6750 /// if (isShuffleEquivalent(Mask, 3, 2, {1, 0})) { ... }
6752 /// It returns true if the mask is exactly as wide as the argument list, and
6753 /// each element of the mask is either -1 (signifying undef) or the value given
6754 /// in the argument.
6755 static bool isShuffleEquivalent(SDValue V1, SDValue V2, ArrayRef<int> Mask,
6756 ArrayRef<int> ExpectedMask) {
6757 if (Mask.size() != ExpectedMask.size())
6760 int Size = Mask.size();
6762 // If the values are build vectors, we can look through them to find
6763 // equivalent inputs that make the shuffles equivalent.
6764 auto *BV1 = dyn_cast<BuildVectorSDNode>(V1);
6765 auto *BV2 = dyn_cast<BuildVectorSDNode>(V2);
6767 for (int i = 0; i < Size; ++i)
6768 if (Mask[i] != -1 && Mask[i] != ExpectedMask[i]) {
6769 auto *MaskBV = Mask[i] < Size ? BV1 : BV2;
6770 auto *ExpectedBV = ExpectedMask[i] < Size ? BV1 : BV2;
6771 if (!MaskBV || !ExpectedBV ||
6772 MaskBV->getOperand(Mask[i] % Size) !=
6773 ExpectedBV->getOperand(ExpectedMask[i] % Size))
6780 /// \brief Get a 4-lane 8-bit shuffle immediate for a mask.
6782 /// This helper function produces an 8-bit shuffle immediate corresponding to
6783 /// the ubiquitous shuffle encoding scheme used in x86 instructions for
6784 /// shuffling 4 lanes. It can be used with most of the PSHUF instructions for
6787 /// NB: We rely heavily on "undef" masks preserving the input lane.
6788 static SDValue getV4X86ShuffleImm8ForMask(ArrayRef<int> Mask, SDLoc DL,
6789 SelectionDAG &DAG) {
6790 assert(Mask.size() == 4 && "Only 4-lane shuffle masks");
6791 assert(Mask[0] >= -1 && Mask[0] < 4 && "Out of bound mask element!");
6792 assert(Mask[1] >= -1 && Mask[1] < 4 && "Out of bound mask element!");
6793 assert(Mask[2] >= -1 && Mask[2] < 4 && "Out of bound mask element!");
6794 assert(Mask[3] >= -1 && Mask[3] < 4 && "Out of bound mask element!");
6797 Imm |= (Mask[0] == -1 ? 0 : Mask[0]) << 0;
6798 Imm |= (Mask[1] == -1 ? 1 : Mask[1]) << 2;
6799 Imm |= (Mask[2] == -1 ? 2 : Mask[2]) << 4;
6800 Imm |= (Mask[3] == -1 ? 3 : Mask[3]) << 6;
6801 return DAG.getConstant(Imm, DL, MVT::i8);
6804 /// \brief Compute whether each element of a shuffle is zeroable.
6806 /// A "zeroable" vector shuffle element is one which can be lowered to zero.
6807 /// Either it is an undef element in the shuffle mask, the element of the input
6808 /// referenced is undef, or the element of the input referenced is known to be
6809 /// zero. Many x86 shuffles can zero lanes cheaply and we often want to handle
6810 /// as many lanes with this technique as possible to simplify the remaining
6812 static SmallBitVector computeZeroableShuffleElements(ArrayRef<int> Mask,
6813 SDValue V1, SDValue V2) {
6814 SmallBitVector Zeroable(Mask.size(), false);
6816 while (V1.getOpcode() == ISD::BITCAST)
6817 V1 = V1->getOperand(0);
6818 while (V2.getOpcode() == ISD::BITCAST)
6819 V2 = V2->getOperand(0);
6821 bool V1IsZero = ISD::isBuildVectorAllZeros(V1.getNode());
6822 bool V2IsZero = ISD::isBuildVectorAllZeros(V2.getNode());
6824 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6826 // Handle the easy cases.
6827 if (M < 0 || (M >= 0 && M < Size && V1IsZero) || (M >= Size && V2IsZero)) {
6832 // If this is an index into a build_vector node (which has the same number
6833 // of elements), dig out the input value and use it.
6834 SDValue V = M < Size ? V1 : V2;
6835 if (V.getOpcode() != ISD::BUILD_VECTOR || Size != (int)V.getNumOperands())
6838 SDValue Input = V.getOperand(M % Size);
6839 // The UNDEF opcode check really should be dead code here, but not quite
6840 // worth asserting on (it isn't invalid, just unexpected).
6841 if (Input.getOpcode() == ISD::UNDEF || X86::isZeroNode(Input))
6848 // X86 has dedicated unpack instructions that can handle specific blend
6849 // operations: UNPCKH and UNPCKL.
6850 static SDValue lowerVectorShuffleWithUNPCK(SDLoc DL, MVT VT, ArrayRef<int> Mask,
6851 SDValue V1, SDValue V2,
6852 SelectionDAG &DAG) {
6853 int NumElts = VT.getVectorNumElements();
6854 int NumEltsInLane = 128 / VT.getScalarSizeInBits();
6855 SmallVector<int, 8> Unpckl;
6856 SmallVector<int, 8> Unpckh;
6858 for (int i = 0; i < NumElts; ++i) {
6859 unsigned LaneStart = (i / NumEltsInLane) * NumEltsInLane;
6860 int LoPos = (i % NumEltsInLane) / 2 + LaneStart + NumElts * (i % 2);
6861 int HiPos = LoPos + NumEltsInLane / 2;
6862 Unpckl.push_back(LoPos);
6863 Unpckh.push_back(HiPos);
6866 if (isShuffleEquivalent(V1, V2, Mask, Unpckl))
6867 return DAG.getNode(X86ISD::UNPCKL, DL, VT, V1, V2);
6868 if (isShuffleEquivalent(V1, V2, Mask, Unpckh))
6869 return DAG.getNode(X86ISD::UNPCKH, DL, VT, V1, V2);
6871 // Commute and try again.
6872 ShuffleVectorSDNode::commuteMask(Unpckl);
6873 if (isShuffleEquivalent(V1, V2, Mask, Unpckl))
6874 return DAG.getNode(X86ISD::UNPCKL, DL, VT, V2, V1);
6876 ShuffleVectorSDNode::commuteMask(Unpckh);
6877 if (isShuffleEquivalent(V1, V2, Mask, Unpckh))
6878 return DAG.getNode(X86ISD::UNPCKH, DL, VT, V2, V1);
6883 /// \brief Try to emit a bitmask instruction for a shuffle.
6885 /// This handles cases where we can model a blend exactly as a bitmask due to
6886 /// one of the inputs being zeroable.
6887 static SDValue lowerVectorShuffleAsBitMask(SDLoc DL, MVT VT, SDValue V1,
6888 SDValue V2, ArrayRef<int> Mask,
6889 SelectionDAG &DAG) {
6890 MVT EltVT = VT.getVectorElementType();
6891 int NumEltBits = EltVT.getSizeInBits();
6892 MVT IntEltVT = MVT::getIntegerVT(NumEltBits);
6893 SDValue Zero = DAG.getConstant(0, DL, IntEltVT);
6894 SDValue AllOnes = DAG.getConstant(APInt::getAllOnesValue(NumEltBits), DL,
6896 if (EltVT.isFloatingPoint()) {
6897 Zero = DAG.getBitcast(EltVT, Zero);
6898 AllOnes = DAG.getBitcast(EltVT, AllOnes);
6900 SmallVector<SDValue, 16> VMaskOps(Mask.size(), Zero);
6901 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
6903 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6906 if (Mask[i] % Size != i)
6907 return SDValue(); // Not a blend.
6909 V = Mask[i] < Size ? V1 : V2;
6910 else if (V != (Mask[i] < Size ? V1 : V2))
6911 return SDValue(); // Can only let one input through the mask.
6913 VMaskOps[i] = AllOnes;
6916 return SDValue(); // No non-zeroable elements!
6918 SDValue VMask = DAG.getNode(ISD::BUILD_VECTOR, DL, VT, VMaskOps);
6919 V = DAG.getNode(VT.isFloatingPoint()
6920 ? (unsigned) X86ISD::FAND : (unsigned) ISD::AND,
6925 /// \brief Try to emit a blend instruction for a shuffle using bit math.
6927 /// This is used as a fallback approach when first class blend instructions are
6928 /// unavailable. Currently it is only suitable for integer vectors, but could
6929 /// be generalized for floating point vectors if desirable.
6930 static SDValue lowerVectorShuffleAsBitBlend(SDLoc DL, MVT VT, SDValue V1,
6931 SDValue V2, ArrayRef<int> Mask,
6932 SelectionDAG &DAG) {
6933 assert(VT.isInteger() && "Only supports integer vector types!");
6934 MVT EltVT = VT.getVectorElementType();
6935 int NumEltBits = EltVT.getSizeInBits();
6936 SDValue Zero = DAG.getConstant(0, DL, EltVT);
6937 SDValue AllOnes = DAG.getConstant(APInt::getAllOnesValue(NumEltBits), DL,
6939 SmallVector<SDValue, 16> MaskOps;
6940 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6941 if (Mask[i] != -1 && Mask[i] != i && Mask[i] != i + Size)
6942 return SDValue(); // Shuffled input!
6943 MaskOps.push_back(Mask[i] < Size ? AllOnes : Zero);
6946 SDValue V1Mask = DAG.getNode(ISD::BUILD_VECTOR, DL, VT, MaskOps);
6947 V1 = DAG.getNode(ISD::AND, DL, VT, V1, V1Mask);
6948 // We have to cast V2 around.
6949 MVT MaskVT = MVT::getVectorVT(MVT::i64, VT.getSizeInBits() / 64);
6950 V2 = DAG.getBitcast(VT, DAG.getNode(X86ISD::ANDNP, DL, MaskVT,
6951 DAG.getBitcast(MaskVT, V1Mask),
6952 DAG.getBitcast(MaskVT, V2)));
6953 return DAG.getNode(ISD::OR, DL, VT, V1, V2);
6956 /// \brief Try to emit a blend instruction for a shuffle.
6958 /// This doesn't do any checks for the availability of instructions for blending
6959 /// these values. It relies on the availability of the X86ISD::BLENDI pattern to
6960 /// be matched in the backend with the type given. What it does check for is
6961 /// that the shuffle mask is a blend, or convertible into a blend with zero.
6962 static SDValue lowerVectorShuffleAsBlend(SDLoc DL, MVT VT, SDValue V1,
6963 SDValue V2, ArrayRef<int> Original,
6964 const X86Subtarget *Subtarget,
6965 SelectionDAG &DAG) {
6966 bool V1IsZero = ISD::isBuildVectorAllZeros(V1.getNode());
6967 bool V2IsZero = ISD::isBuildVectorAllZeros(V2.getNode());
6968 SmallVector<int, 8> Mask(Original.begin(), Original.end());
6969 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
6970 bool ForceV1Zero = false, ForceV2Zero = false;
6972 // Attempt to generate the binary blend mask. If an input is zero then
6973 // we can use any lane.
6974 // TODO: generalize the zero matching to any scalar like isShuffleEquivalent.
6975 unsigned BlendMask = 0;
6976 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
6982 if (M == i + Size) {
6983 BlendMask |= 1u << i;
6994 BlendMask |= 1u << i;
6999 return SDValue(); // Shuffled input!
7002 // Create a REAL zero vector - ISD::isBuildVectorAllZeros allows UNDEFs.
7004 V1 = getZeroVector(VT, Subtarget, DAG, DL);
7006 V2 = getZeroVector(VT, Subtarget, DAG, DL);
7008 auto ScaleBlendMask = [](unsigned BlendMask, int Size, int Scale) {
7009 unsigned ScaledMask = 0;
7010 for (int i = 0; i != Size; ++i)
7011 if (BlendMask & (1u << i))
7012 for (int j = 0; j != Scale; ++j)
7013 ScaledMask |= 1u << (i * Scale + j);
7017 switch (VT.SimpleTy) {
7022 return DAG.getNode(X86ISD::BLENDI, DL, VT, V1, V2,
7023 DAG.getConstant(BlendMask, DL, MVT::i8));
7027 assert(Subtarget->hasAVX2() && "256-bit integer blends require AVX2!");
7031 // If we have AVX2 it is faster to use VPBLENDD when the shuffle fits into
7032 // that instruction.
7033 if (Subtarget->hasAVX2()) {
7034 // Scale the blend by the number of 32-bit dwords per element.
7035 int Scale = VT.getScalarSizeInBits() / 32;
7036 BlendMask = ScaleBlendMask(BlendMask, Mask.size(), Scale);
7037 MVT BlendVT = VT.getSizeInBits() > 128 ? MVT::v8i32 : MVT::v4i32;
7038 V1 = DAG.getBitcast(BlendVT, V1);
7039 V2 = DAG.getBitcast(BlendVT, V2);
7040 return DAG.getBitcast(
7041 VT, DAG.getNode(X86ISD::BLENDI, DL, BlendVT, V1, V2,
7042 DAG.getConstant(BlendMask, DL, MVT::i8)));
7046 // For integer shuffles we need to expand the mask and cast the inputs to
7047 // v8i16s prior to blending.
7048 int Scale = 8 / VT.getVectorNumElements();
7049 BlendMask = ScaleBlendMask(BlendMask, Mask.size(), Scale);
7050 V1 = DAG.getBitcast(MVT::v8i16, V1);
7051 V2 = DAG.getBitcast(MVT::v8i16, V2);
7052 return DAG.getBitcast(VT,
7053 DAG.getNode(X86ISD::BLENDI, DL, MVT::v8i16, V1, V2,
7054 DAG.getConstant(BlendMask, DL, MVT::i8)));
7058 assert(Subtarget->hasAVX2() && "256-bit integer blends require AVX2!");
7059 SmallVector<int, 8> RepeatedMask;
7060 if (is128BitLaneRepeatedShuffleMask(MVT::v16i16, Mask, RepeatedMask)) {
7061 // We can lower these with PBLENDW which is mirrored across 128-bit lanes.
7062 assert(RepeatedMask.size() == 8 && "Repeated mask size doesn't match!");
7064 for (int i = 0; i < 8; ++i)
7065 if (RepeatedMask[i] >= 16)
7066 BlendMask |= 1u << i;
7067 return DAG.getNode(X86ISD::BLENDI, DL, MVT::v16i16, V1, V2,
7068 DAG.getConstant(BlendMask, DL, MVT::i8));
7074 assert((VT.is128BitVector() || Subtarget->hasAVX2()) &&
7075 "256-bit byte-blends require AVX2 support!");
7077 // Attempt to lower to a bitmask if we can. VPAND is faster than VPBLENDVB.
7078 if (SDValue Masked = lowerVectorShuffleAsBitMask(DL, VT, V1, V2, Mask, DAG))
7081 // Scale the blend by the number of bytes per element.
7082 int Scale = VT.getScalarSizeInBits() / 8;
7084 // This form of blend is always done on bytes. Compute the byte vector
7086 MVT BlendVT = MVT::getVectorVT(MVT::i8, VT.getSizeInBits() / 8);
7088 // Compute the VSELECT mask. Note that VSELECT is really confusing in the
7089 // mix of LLVM's code generator and the x86 backend. We tell the code
7090 // generator that boolean values in the elements of an x86 vector register
7091 // are -1 for true and 0 for false. We then use the LLVM semantics of 'true'
7092 // mapping a select to operand #1, and 'false' mapping to operand #2. The
7093 // reality in x86 is that vector masks (pre-AVX-512) use only the high bit
7094 // of the element (the remaining are ignored) and 0 in that high bit would
7095 // mean operand #1 while 1 in the high bit would mean operand #2. So while
7096 // the LLVM model for boolean values in vector elements gets the relevant
7097 // bit set, it is set backwards and over constrained relative to x86's
7099 SmallVector<SDValue, 32> VSELECTMask;
7100 for (int i = 0, Size = Mask.size(); i < Size; ++i)
7101 for (int j = 0; j < Scale; ++j)
7102 VSELECTMask.push_back(
7103 Mask[i] < 0 ? DAG.getUNDEF(MVT::i8)
7104 : DAG.getConstant(Mask[i] < Size ? -1 : 0, DL,
7107 V1 = DAG.getBitcast(BlendVT, V1);
7108 V2 = DAG.getBitcast(BlendVT, V2);
7109 return DAG.getBitcast(VT, DAG.getNode(ISD::VSELECT, DL, BlendVT,
7110 DAG.getNode(ISD::BUILD_VECTOR, DL,
7111 BlendVT, VSELECTMask),
7116 llvm_unreachable("Not a supported integer vector type!");
7120 /// \brief Try to lower as a blend of elements from two inputs followed by
7121 /// a single-input permutation.
7123 /// This matches the pattern where we can blend elements from two inputs and
7124 /// then reduce the shuffle to a single-input permutation.
7125 static SDValue lowerVectorShuffleAsBlendAndPermute(SDLoc DL, MVT VT, SDValue V1,
7128 SelectionDAG &DAG) {
7129 // We build up the blend mask while checking whether a blend is a viable way
7130 // to reduce the shuffle.
7131 SmallVector<int, 32> BlendMask(Mask.size(), -1);
7132 SmallVector<int, 32> PermuteMask(Mask.size(), -1);
7134 for (int i = 0, Size = Mask.size(); i < Size; ++i) {
7138 assert(Mask[i] < Size * 2 && "Shuffle input is out of bounds.");
7140 if (BlendMask[Mask[i] % Size] == -1)
7141 BlendMask[Mask[i] % Size] = Mask[i];
7142 else if (BlendMask[Mask[i] % Size] != Mask[i])
7143 return SDValue(); // Can't blend in the needed input!
7145 PermuteMask[i] = Mask[i] % Size;
7148 SDValue V = DAG.getVectorShuffle(VT, DL, V1, V2, BlendMask);
7149 return DAG.getVectorShuffle(VT, DL, V, DAG.getUNDEF(VT), PermuteMask);
7152 /// \brief Generic routine to decompose a shuffle and blend into indepndent
7153 /// blends and permutes.
7155 /// This matches the extremely common pattern for handling combined
7156 /// shuffle+blend operations on newer X86 ISAs where we have very fast blend
7157 /// operations. It will try to pick the best arrangement of shuffles and
7159 static SDValue lowerVectorShuffleAsDecomposedShuffleBlend(SDLoc DL, MVT VT,
7163 SelectionDAG &DAG) {
7164 // Shuffle the input elements into the desired positions in V1 and V2 and
7165 // blend them together.
7166 SmallVector<int, 32> V1Mask(Mask.size(), -1);
7167 SmallVector<int, 32> V2Mask(Mask.size(), -1);
7168 SmallVector<int, 32> BlendMask(Mask.size(), -1);
7169 for (int i = 0, Size = Mask.size(); i < Size; ++i)
7170 if (Mask[i] >= 0 && Mask[i] < Size) {
7171 V1Mask[i] = Mask[i];
7173 } else if (Mask[i] >= Size) {
7174 V2Mask[i] = Mask[i] - Size;
7175 BlendMask[i] = i + Size;
7178 // Try to lower with the simpler initial blend strategy unless one of the
7179 // input shuffles would be a no-op. We prefer to shuffle inputs as the
7180 // shuffle may be able to fold with a load or other benefit. However, when
7181 // we'll have to do 2x as many shuffles in order to achieve this, blending
7182 // first is a better strategy.
7183 if (!isNoopShuffleMask(V1Mask) && !isNoopShuffleMask(V2Mask))
7184 if (SDValue BlendPerm =
7185 lowerVectorShuffleAsBlendAndPermute(DL, VT, V1, V2, Mask, DAG))
7188 V1 = DAG.getVectorShuffle(VT, DL, V1, DAG.getUNDEF(VT), V1Mask);
7189 V2 = DAG.getVectorShuffle(VT, DL, V2, DAG.getUNDEF(VT), V2Mask);
7190 return DAG.getVectorShuffle(VT, DL, V1, V2, BlendMask);
7193 /// \brief Try to lower a vector shuffle as a byte rotation.
7195 /// SSSE3 has a generic PALIGNR instruction in x86 that will do an arbitrary
7196 /// byte-rotation of the concatenation of two vectors; pre-SSSE3 can use
7197 /// a PSRLDQ/PSLLDQ/POR pattern to get a similar effect. This routine will
7198 /// try to generically lower a vector shuffle through such an pattern. It
7199 /// does not check for the profitability of lowering either as PALIGNR or
7200 /// PSRLDQ/PSLLDQ/POR, only whether the mask is valid to lower in that form.
7201 /// This matches shuffle vectors that look like:
7203 /// v8i16 [11, 12, 13, 14, 15, 0, 1, 2]
7205 /// Essentially it concatenates V1 and V2, shifts right by some number of
7206 /// elements, and takes the low elements as the result. Note that while this is
7207 /// specified as a *right shift* because x86 is little-endian, it is a *left
7208 /// rotate* of the vector lanes.
7209 static SDValue lowerVectorShuffleAsByteRotate(SDLoc DL, MVT VT, SDValue V1,
7212 const X86Subtarget *Subtarget,
7213 SelectionDAG &DAG) {
7214 assert(!isNoopShuffleMask(Mask) && "We shouldn't lower no-op shuffles!");
7216 int NumElts = Mask.size();
7217 int NumLanes = VT.getSizeInBits() / 128;
7218 int NumLaneElts = NumElts / NumLanes;
7220 // We need to detect various ways of spelling a rotation:
7221 // [11, 12, 13, 14, 15, 0, 1, 2]
7222 // [-1, 12, 13, 14, -1, -1, 1, -1]
7223 // [-1, -1, -1, -1, -1, -1, 1, 2]
7224 // [ 3, 4, 5, 6, 7, 8, 9, 10]
7225 // [-1, 4, 5, 6, -1, -1, 9, -1]
7226 // [-1, 4, 5, 6, -1, -1, -1, -1]
7229 for (int l = 0; l < NumElts; l += NumLaneElts) {
7230 for (int i = 0; i < NumLaneElts; ++i) {
7231 if (Mask[l + i] == -1)
7233 assert(Mask[l + i] >= 0 && "Only -1 is a valid negative mask element!");
7235 // Get the mod-Size index and lane correct it.
7236 int LaneIdx = (Mask[l + i] % NumElts) - l;
7237 // Make sure it was in this lane.
7238 if (LaneIdx < 0 || LaneIdx >= NumLaneElts)
7241 // Determine where a rotated vector would have started.
7242 int StartIdx = i - LaneIdx;
7244 // The identity rotation isn't interesting, stop.
7247 // If we found the tail of a vector the rotation must be the missing
7248 // front. If we found the head of a vector, it must be how much of the
7250 int CandidateRotation = StartIdx < 0 ? -StartIdx : NumLaneElts - StartIdx;
7253 Rotation = CandidateRotation;
7254 else if (Rotation != CandidateRotation)
7255 // The rotations don't match, so we can't match this mask.
7258 // Compute which value this mask is pointing at.
7259 SDValue MaskV = Mask[l + i] < NumElts ? V1 : V2;
7261 // Compute which of the two target values this index should be assigned
7262 // to. This reflects whether the high elements are remaining or the low
7263 // elements are remaining.
7264 SDValue &TargetV = StartIdx < 0 ? Hi : Lo;
7266 // Either set up this value if we've not encountered it before, or check
7267 // that it remains consistent.
7270 else if (TargetV != MaskV)
7271 // This may be a rotation, but it pulls from the inputs in some
7272 // unsupported interleaving.
7277 // Check that we successfully analyzed the mask, and normalize the results.
7278 assert(Rotation != 0 && "Failed to locate a viable rotation!");
7279 assert((Lo || Hi) && "Failed to find a rotated input vector!");
7285 // The actual rotate instruction rotates bytes, so we need to scale the
7286 // rotation based on how many bytes are in the vector lane.
7287 int Scale = 16 / NumLaneElts;
7289 // SSSE3 targets can use the palignr instruction.
7290 if (Subtarget->hasSSSE3()) {
7291 // Cast the inputs to i8 vector of correct length to match PALIGNR.
7292 MVT AlignVT = MVT::getVectorVT(MVT::i8, 16 * NumLanes);
7293 Lo = DAG.getBitcast(AlignVT, Lo);
7294 Hi = DAG.getBitcast(AlignVT, Hi);
7296 return DAG.getBitcast(
7297 VT, DAG.getNode(X86ISD::PALIGNR, DL, AlignVT, Lo, Hi,
7298 DAG.getConstant(Rotation * Scale, DL, MVT::i8)));
7301 assert(VT.is128BitVector() &&
7302 "Rotate-based lowering only supports 128-bit lowering!");
7303 assert(Mask.size() <= 16 &&
7304 "Can shuffle at most 16 bytes in a 128-bit vector!");
7306 // Default SSE2 implementation
7307 int LoByteShift = 16 - Rotation * Scale;
7308 int HiByteShift = Rotation * Scale;
7310 // Cast the inputs to v2i64 to match PSLLDQ/PSRLDQ.
7311 Lo = DAG.getBitcast(MVT::v2i64, Lo);
7312 Hi = DAG.getBitcast(MVT::v2i64, Hi);
7314 SDValue LoShift = DAG.getNode(X86ISD::VSHLDQ, DL, MVT::v2i64, Lo,
7315 DAG.getConstant(LoByteShift, DL, MVT::i8));
7316 SDValue HiShift = DAG.getNode(X86ISD::VSRLDQ, DL, MVT::v2i64, Hi,
7317 DAG.getConstant(HiByteShift, DL, MVT::i8));
7318 return DAG.getBitcast(VT,
7319 DAG.getNode(ISD::OR, DL, MVT::v2i64, LoShift, HiShift));
7322 /// \brief Try to lower a vector shuffle as a bit shift (shifts in zeros).
7324 /// Attempts to match a shuffle mask against the PSLL(W/D/Q/DQ) and
7325 /// PSRL(W/D/Q/DQ) SSE2 and AVX2 logical bit-shift instructions. The function
7326 /// matches elements from one of the input vectors shuffled to the left or
7327 /// right with zeroable elements 'shifted in'. It handles both the strictly
7328 /// bit-wise element shifts and the byte shift across an entire 128-bit double
7331 /// PSHL : (little-endian) left bit shift.
7332 /// [ zz, 0, zz, 2 ]
7333 /// [ -1, 4, zz, -1 ]
7334 /// PSRL : (little-endian) right bit shift.
7336 /// [ -1, -1, 7, zz]
7337 /// PSLLDQ : (little-endian) left byte shift
7338 /// [ zz, 0, 1, 2, 3, 4, 5, 6]
7339 /// [ zz, zz, -1, -1, 2, 3, 4, -1]
7340 /// [ zz, zz, zz, zz, zz, zz, -1, 1]
7341 /// PSRLDQ : (little-endian) right byte shift
7342 /// [ 5, 6, 7, zz, zz, zz, zz, zz]
7343 /// [ -1, 5, 6, 7, zz, zz, zz, zz]
7344 /// [ 1, 2, -1, -1, -1, -1, zz, zz]
7345 static SDValue lowerVectorShuffleAsShift(SDLoc DL, MVT VT, SDValue V1,
7346 SDValue V2, ArrayRef<int> Mask,
7347 SelectionDAG &DAG) {
7348 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7350 int Size = Mask.size();
7351 assert(Size == (int)VT.getVectorNumElements() && "Unexpected mask size");
7353 auto CheckZeros = [&](int Shift, int Scale, bool Left) {
7354 for (int i = 0; i < Size; i += Scale)
7355 for (int j = 0; j < Shift; ++j)
7356 if (!Zeroable[i + j + (Left ? 0 : (Scale - Shift))])
7362 auto MatchShift = [&](int Shift, int Scale, bool Left, SDValue V) {
7363 for (int i = 0; i != Size; i += Scale) {
7364 unsigned Pos = Left ? i + Shift : i;
7365 unsigned Low = Left ? i : i + Shift;
7366 unsigned Len = Scale - Shift;
7367 if (!isSequentialOrUndefInRange(Mask, Pos, Len,
7368 Low + (V == V1 ? 0 : Size)))
7372 int ShiftEltBits = VT.getScalarSizeInBits() * Scale;
7373 bool ByteShift = ShiftEltBits > 64;
7374 unsigned OpCode = Left ? (ByteShift ? X86ISD::VSHLDQ : X86ISD::VSHLI)
7375 : (ByteShift ? X86ISD::VSRLDQ : X86ISD::VSRLI);
7376 int ShiftAmt = Shift * VT.getScalarSizeInBits() / (ByteShift ? 8 : 1);
7378 // Normalize the scale for byte shifts to still produce an i64 element
7380 Scale = ByteShift ? Scale / 2 : Scale;
7382 // We need to round trip through the appropriate type for the shift.
7383 MVT ShiftSVT = MVT::getIntegerVT(VT.getScalarSizeInBits() * Scale);
7384 MVT ShiftVT = MVT::getVectorVT(ShiftSVT, Size / Scale);
7385 assert(DAG.getTargetLoweringInfo().isTypeLegal(ShiftVT) &&
7386 "Illegal integer vector type");
7387 V = DAG.getBitcast(ShiftVT, V);
7389 V = DAG.getNode(OpCode, DL, ShiftVT, V,
7390 DAG.getConstant(ShiftAmt, DL, MVT::i8));
7391 return DAG.getBitcast(VT, V);
7394 // SSE/AVX supports logical shifts up to 64-bit integers - so we can just
7395 // keep doubling the size of the integer elements up to that. We can
7396 // then shift the elements of the integer vector by whole multiples of
7397 // their width within the elements of the larger integer vector. Test each
7398 // multiple to see if we can find a match with the moved element indices
7399 // and that the shifted in elements are all zeroable.
7400 for (int Scale = 2; Scale * VT.getScalarSizeInBits() <= 128; Scale *= 2)
7401 for (int Shift = 1; Shift != Scale; ++Shift)
7402 for (bool Left : {true, false})
7403 if (CheckZeros(Shift, Scale, Left))
7404 for (SDValue V : {V1, V2})
7405 if (SDValue Match = MatchShift(Shift, Scale, Left, V))
7412 /// \brief Try to lower a vector shuffle using SSE4a EXTRQ/INSERTQ.
7413 static SDValue lowerVectorShuffleWithSSE4A(SDLoc DL, MVT VT, SDValue V1,
7414 SDValue V2, ArrayRef<int> Mask,
7415 SelectionDAG &DAG) {
7416 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7417 assert(!Zeroable.all() && "Fully zeroable shuffle mask");
7419 int Size = Mask.size();
7420 int HalfSize = Size / 2;
7421 assert(Size == (int)VT.getVectorNumElements() && "Unexpected mask size");
7423 // Upper half must be undefined.
7424 if (!isUndefInRange(Mask, HalfSize, HalfSize))
7427 // EXTRQ: Extract Len elements from lower half of source, starting at Idx.
7428 // Remainder of lower half result is zero and upper half is all undef.
7429 auto LowerAsEXTRQ = [&]() {
7430 // Determine the extraction length from the part of the
7431 // lower half that isn't zeroable.
7433 for (; Len > 0; --Len)
7434 if (!Zeroable[Len - 1])
7436 assert(Len > 0 && "Zeroable shuffle mask");
7438 // Attempt to match first Len sequential elements from the lower half.
7441 for (int i = 0; i != Len; ++i) {
7445 SDValue &V = (M < Size ? V1 : V2);
7448 // The extracted elements must start at a valid index and all mask
7449 // elements must be in the lower half.
7450 if (i > M || M >= HalfSize)
7453 if (Idx < 0 || (Src == V && Idx == (M - i))) {
7464 assert((Idx + Len) <= HalfSize && "Illegal extraction mask");
7465 int BitLen = (Len * VT.getScalarSizeInBits()) & 0x3f;
7466 int BitIdx = (Idx * VT.getScalarSizeInBits()) & 0x3f;
7467 return DAG.getNode(X86ISD::EXTRQI, DL, VT, Src,
7468 DAG.getConstant(BitLen, DL, MVT::i8),
7469 DAG.getConstant(BitIdx, DL, MVT::i8));
7472 if (SDValue ExtrQ = LowerAsEXTRQ())
7475 // INSERTQ: Extract lowest Len elements from lower half of second source and
7476 // insert over first source, starting at Idx.
7477 // { A[0], .., A[Idx-1], B[0], .., B[Len-1], A[Idx+Len], .., UNDEF, ... }
7478 auto LowerAsInsertQ = [&]() {
7479 for (int Idx = 0; Idx != HalfSize; ++Idx) {
7482 // Attempt to match first source from mask before insertion point.
7483 if (isUndefInRange(Mask, 0, Idx)) {
7485 } else if (isSequentialOrUndefInRange(Mask, 0, Idx, 0)) {
7487 } else if (isSequentialOrUndefInRange(Mask, 0, Idx, Size)) {
7493 // Extend the extraction length looking to match both the insertion of
7494 // the second source and the remaining elements of the first.
7495 for (int Hi = Idx + 1; Hi <= HalfSize; ++Hi) {
7500 if (isSequentialOrUndefInRange(Mask, Idx, Len, 0)) {
7502 } else if (isSequentialOrUndefInRange(Mask, Idx, Len, Size)) {
7508 // Match the remaining elements of the lower half.
7509 if (isUndefInRange(Mask, Hi, HalfSize - Hi)) {
7511 } else if ((!Base || (Base == V1)) &&
7512 isSequentialOrUndefInRange(Mask, Hi, HalfSize - Hi, Hi)) {
7514 } else if ((!Base || (Base == V2)) &&
7515 isSequentialOrUndefInRange(Mask, Hi, HalfSize - Hi,
7522 // We may not have a base (first source) - this can safely be undefined.
7524 Base = DAG.getUNDEF(VT);
7526 int BitLen = (Len * VT.getScalarSizeInBits()) & 0x3f;
7527 int BitIdx = (Idx * VT.getScalarSizeInBits()) & 0x3f;
7528 return DAG.getNode(X86ISD::INSERTQI, DL, VT, Base, Insert,
7529 DAG.getConstant(BitLen, DL, MVT::i8),
7530 DAG.getConstant(BitIdx, DL, MVT::i8));
7537 if (SDValue InsertQ = LowerAsInsertQ())
7543 /// \brief Lower a vector shuffle as a zero or any extension.
7545 /// Given a specific number of elements, element bit width, and extension
7546 /// stride, produce either a zero or any extension based on the available
7547 /// features of the subtarget. The extended elements are consecutive and
7548 /// begin and can start from an offseted element index in the input; to
7549 /// avoid excess shuffling the offset must either being in the bottom lane
7550 /// or at the start of a higher lane. All extended elements must be from
7552 static SDValue lowerVectorShuffleAsSpecificZeroOrAnyExtend(
7553 SDLoc DL, MVT VT, int Scale, int Offset, bool AnyExt, SDValue InputV,
7554 ArrayRef<int> Mask, const X86Subtarget *Subtarget, SelectionDAG &DAG) {
7555 assert(Scale > 1 && "Need a scale to extend.");
7556 int EltBits = VT.getScalarSizeInBits();
7557 int NumElements = VT.getVectorNumElements();
7558 int NumEltsPerLane = 128 / EltBits;
7559 int OffsetLane = Offset / NumEltsPerLane;
7560 assert((EltBits == 8 || EltBits == 16 || EltBits == 32) &&
7561 "Only 8, 16, and 32 bit elements can be extended.");
7562 assert(Scale * EltBits <= 64 && "Cannot zero extend past 64 bits.");
7563 assert(0 <= Offset && "Extension offset must be positive.");
7564 assert((Offset < NumEltsPerLane || Offset % NumEltsPerLane == 0) &&
7565 "Extension offset must be in the first lane or start an upper lane.");
7567 // Check that an index is in same lane as the base offset.
7568 auto SafeOffset = [&](int Idx) {
7569 return OffsetLane == (Idx / NumEltsPerLane);
7572 // Shift along an input so that the offset base moves to the first element.
7573 auto ShuffleOffset = [&](SDValue V) {
7577 SmallVector<int, 8> ShMask((unsigned)NumElements, -1);
7578 for (int i = 0; i * Scale < NumElements; ++i) {
7579 int SrcIdx = i + Offset;
7580 ShMask[i] = SafeOffset(SrcIdx) ? SrcIdx : -1;
7582 return DAG.getVectorShuffle(VT, DL, V, DAG.getUNDEF(VT), ShMask);
7585 // Found a valid zext mask! Try various lowering strategies based on the
7586 // input type and available ISA extensions.
7587 if (Subtarget->hasSSE41()) {
7588 // Not worth offseting 128-bit vectors if scale == 2, a pattern using
7589 // PUNPCK will catch this in a later shuffle match.
7590 if (Offset && Scale == 2 && VT.is128BitVector())
7592 MVT ExtVT = MVT::getVectorVT(MVT::getIntegerVT(EltBits * Scale),
7593 NumElements / Scale);
7594 InputV = DAG.getNode(X86ISD::VZEXT, DL, ExtVT, ShuffleOffset(InputV));
7595 return DAG.getBitcast(VT, InputV);
7598 assert(VT.is128BitVector() && "Only 128-bit vectors can be extended.");
7600 // For any extends we can cheat for larger element sizes and use shuffle
7601 // instructions that can fold with a load and/or copy.
7602 if (AnyExt && EltBits == 32) {
7603 int PSHUFDMask[4] = {Offset, -1, SafeOffset(Offset + 1) ? Offset + 1 : -1,
7605 return DAG.getBitcast(
7606 VT, DAG.getNode(X86ISD::PSHUFD, DL, MVT::v4i32,
7607 DAG.getBitcast(MVT::v4i32, InputV),
7608 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG)));
7610 if (AnyExt && EltBits == 16 && Scale > 2) {
7611 int PSHUFDMask[4] = {Offset / 2, -1,
7612 SafeOffset(Offset + 1) ? (Offset + 1) / 2 : -1, -1};
7613 InputV = DAG.getNode(X86ISD::PSHUFD, DL, MVT::v4i32,
7614 DAG.getBitcast(MVT::v4i32, InputV),
7615 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG));
7616 int PSHUFWMask[4] = {1, -1, -1, -1};
7617 unsigned OddEvenOp = (Offset & 1 ? X86ISD::PSHUFLW : X86ISD::PSHUFHW);
7618 return DAG.getBitcast(
7619 VT, DAG.getNode(OddEvenOp, DL, MVT::v8i16,
7620 DAG.getBitcast(MVT::v8i16, InputV),
7621 getV4X86ShuffleImm8ForMask(PSHUFWMask, DL, DAG)));
7624 // The SSE4A EXTRQ instruction can efficiently extend the first 2 lanes
7626 if ((Scale * EltBits) == 64 && EltBits < 32 && Subtarget->hasSSE4A()) {
7627 assert(NumElements == (int)Mask.size() && "Unexpected shuffle mask size!");
7628 assert(VT.is128BitVector() && "Unexpected vector width!");
7630 int LoIdx = Offset * EltBits;
7631 SDValue Lo = DAG.getNode(ISD::BITCAST, DL, MVT::v2i64,
7632 DAG.getNode(X86ISD::EXTRQI, DL, VT, InputV,
7633 DAG.getConstant(EltBits, DL, MVT::i8),
7634 DAG.getConstant(LoIdx, DL, MVT::i8)));
7636 if (isUndefInRange(Mask, NumElements / 2, NumElements / 2) ||
7637 !SafeOffset(Offset + 1))
7638 return DAG.getNode(ISD::BITCAST, DL, VT, Lo);
7640 int HiIdx = (Offset + 1) * EltBits;
7641 SDValue Hi = DAG.getNode(ISD::BITCAST, DL, MVT::v2i64,
7642 DAG.getNode(X86ISD::EXTRQI, DL, VT, InputV,
7643 DAG.getConstant(EltBits, DL, MVT::i8),
7644 DAG.getConstant(HiIdx, DL, MVT::i8)));
7645 return DAG.getNode(ISD::BITCAST, DL, VT,
7646 DAG.getNode(X86ISD::UNPCKL, DL, MVT::v2i64, Lo, Hi));
7649 // If this would require more than 2 unpack instructions to expand, use
7650 // pshufb when available. We can only use more than 2 unpack instructions
7651 // when zero extending i8 elements which also makes it easier to use pshufb.
7652 if (Scale > 4 && EltBits == 8 && Subtarget->hasSSSE3()) {
7653 assert(NumElements == 16 && "Unexpected byte vector width!");
7654 SDValue PSHUFBMask[16];
7655 for (int i = 0; i < 16; ++i) {
7656 int Idx = Offset + (i / Scale);
7657 PSHUFBMask[i] = DAG.getConstant(
7658 (i % Scale == 0 && SafeOffset(Idx)) ? Idx : 0x80, DL, MVT::i8);
7660 InputV = DAG.getBitcast(MVT::v16i8, InputV);
7661 return DAG.getBitcast(VT,
7662 DAG.getNode(X86ISD::PSHUFB, DL, MVT::v16i8, InputV,
7663 DAG.getNode(ISD::BUILD_VECTOR, DL,
7664 MVT::v16i8, PSHUFBMask)));
7667 // If we are extending from an offset, ensure we start on a boundary that
7668 // we can unpack from.
7669 int AlignToUnpack = Offset % (NumElements / Scale);
7670 if (AlignToUnpack) {
7671 SmallVector<int, 8> ShMask((unsigned)NumElements, -1);
7672 for (int i = AlignToUnpack; i < NumElements; ++i)
7673 ShMask[i - AlignToUnpack] = i;
7674 InputV = DAG.getVectorShuffle(VT, DL, InputV, DAG.getUNDEF(VT), ShMask);
7675 Offset -= AlignToUnpack;
7678 // Otherwise emit a sequence of unpacks.
7680 unsigned UnpackLoHi = X86ISD::UNPCKL;
7681 if (Offset >= (NumElements / 2)) {
7682 UnpackLoHi = X86ISD::UNPCKH;
7683 Offset -= (NumElements / 2);
7686 MVT InputVT = MVT::getVectorVT(MVT::getIntegerVT(EltBits), NumElements);
7687 SDValue Ext = AnyExt ? DAG.getUNDEF(InputVT)
7688 : getZeroVector(InputVT, Subtarget, DAG, DL);
7689 InputV = DAG.getBitcast(InputVT, InputV);
7690 InputV = DAG.getNode(UnpackLoHi, DL, InputVT, InputV, Ext);
7694 } while (Scale > 1);
7695 return DAG.getBitcast(VT, InputV);
7698 /// \brief Try to lower a vector shuffle as a zero extension on any microarch.
7700 /// This routine will try to do everything in its power to cleverly lower
7701 /// a shuffle which happens to match the pattern of a zero extend. It doesn't
7702 /// check for the profitability of this lowering, it tries to aggressively
7703 /// match this pattern. It will use all of the micro-architectural details it
7704 /// can to emit an efficient lowering. It handles both blends with all-zero
7705 /// inputs to explicitly zero-extend and undef-lanes (sometimes undef due to
7706 /// masking out later).
7708 /// The reason we have dedicated lowering for zext-style shuffles is that they
7709 /// are both incredibly common and often quite performance sensitive.
7710 static SDValue lowerVectorShuffleAsZeroOrAnyExtend(
7711 SDLoc DL, MVT VT, SDValue V1, SDValue V2, ArrayRef<int> Mask,
7712 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
7713 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7715 int Bits = VT.getSizeInBits();
7716 int NumLanes = Bits / 128;
7717 int NumElements = VT.getVectorNumElements();
7718 int NumEltsPerLane = NumElements / NumLanes;
7719 assert(VT.getScalarSizeInBits() <= 32 &&
7720 "Exceeds 32-bit integer zero extension limit");
7721 assert((int)Mask.size() == NumElements && "Unexpected shuffle mask size");
7723 // Define a helper function to check a particular ext-scale and lower to it if
7725 auto Lower = [&](int Scale) -> SDValue {
7730 for (int i = 0; i < NumElements; ++i) {
7733 continue; // Valid anywhere but doesn't tell us anything.
7734 if (i % Scale != 0) {
7735 // Each of the extended elements need to be zeroable.
7739 // We no longer are in the anyext case.
7744 // Each of the base elements needs to be consecutive indices into the
7745 // same input vector.
7746 SDValue V = M < NumElements ? V1 : V2;
7747 M = M % NumElements;
7750 Offset = M - (i / Scale);
7751 } else if (InputV != V)
7752 return SDValue(); // Flip-flopping inputs.
7754 // Offset must start in the lowest 128-bit lane or at the start of an
7756 // FIXME: Is it ever worth allowing a negative base offset?
7757 if (!((0 <= Offset && Offset < NumEltsPerLane) ||
7758 (Offset % NumEltsPerLane) == 0))
7761 // If we are offsetting, all referenced entries must come from the same
7763 if (Offset && (Offset / NumEltsPerLane) != (M / NumEltsPerLane))
7766 if ((M % NumElements) != (Offset + (i / Scale)))
7767 return SDValue(); // Non-consecutive strided elements.
7771 // If we fail to find an input, we have a zero-shuffle which should always
7772 // have already been handled.
7773 // FIXME: Maybe handle this here in case during blending we end up with one?
7777 // If we are offsetting, don't extend if we only match a single input, we
7778 // can always do better by using a basic PSHUF or PUNPCK.
7779 if (Offset != 0 && Matches < 2)
7782 return lowerVectorShuffleAsSpecificZeroOrAnyExtend(
7783 DL, VT, Scale, Offset, AnyExt, InputV, Mask, Subtarget, DAG);
7786 // The widest scale possible for extending is to a 64-bit integer.
7787 assert(Bits % 64 == 0 &&
7788 "The number of bits in a vector must be divisible by 64 on x86!");
7789 int NumExtElements = Bits / 64;
7791 // Each iteration, try extending the elements half as much, but into twice as
7793 for (; NumExtElements < NumElements; NumExtElements *= 2) {
7794 assert(NumElements % NumExtElements == 0 &&
7795 "The input vector size must be divisible by the extended size.");
7796 if (SDValue V = Lower(NumElements / NumExtElements))
7800 // General extends failed, but 128-bit vectors may be able to use MOVQ.
7804 // Returns one of the source operands if the shuffle can be reduced to a
7805 // MOVQ, copying the lower 64-bits and zero-extending to the upper 64-bits.
7806 auto CanZExtLowHalf = [&]() {
7807 for (int i = NumElements / 2; i != NumElements; ++i)
7810 if (isSequentialOrUndefInRange(Mask, 0, NumElements / 2, 0))
7812 if (isSequentialOrUndefInRange(Mask, 0, NumElements / 2, NumElements))
7817 if (SDValue V = CanZExtLowHalf()) {
7818 V = DAG.getBitcast(MVT::v2i64, V);
7819 V = DAG.getNode(X86ISD::VZEXT_MOVL, DL, MVT::v2i64, V);
7820 return DAG.getBitcast(VT, V);
7823 // No viable ext lowering found.
7827 /// \brief Try to get a scalar value for a specific element of a vector.
7829 /// Looks through BUILD_VECTOR and SCALAR_TO_VECTOR nodes to find a scalar.
7830 static SDValue getScalarValueForVectorElement(SDValue V, int Idx,
7831 SelectionDAG &DAG) {
7832 MVT VT = V.getSimpleValueType();
7833 MVT EltVT = VT.getVectorElementType();
7834 while (V.getOpcode() == ISD::BITCAST)
7835 V = V.getOperand(0);
7836 // If the bitcasts shift the element size, we can't extract an equivalent
7838 MVT NewVT = V.getSimpleValueType();
7839 if (!NewVT.isVector() || NewVT.getScalarSizeInBits() != VT.getScalarSizeInBits())
7842 if (V.getOpcode() == ISD::BUILD_VECTOR ||
7843 (Idx == 0 && V.getOpcode() == ISD::SCALAR_TO_VECTOR)) {
7844 // Ensure the scalar operand is the same size as the destination.
7845 // FIXME: Add support for scalar truncation where possible.
7846 SDValue S = V.getOperand(Idx);
7847 if (EltVT.getSizeInBits() == S.getSimpleValueType().getSizeInBits())
7848 return DAG.getNode(ISD::BITCAST, SDLoc(V), EltVT, S);
7854 /// \brief Helper to test for a load that can be folded with x86 shuffles.
7856 /// This is particularly important because the set of instructions varies
7857 /// significantly based on whether the operand is a load or not.
7858 static bool isShuffleFoldableLoad(SDValue V) {
7859 while (V.getOpcode() == ISD::BITCAST)
7860 V = V.getOperand(0);
7862 return ISD::isNON_EXTLoad(V.getNode());
7865 /// \brief Try to lower insertion of a single element into a zero vector.
7867 /// This is a common pattern that we have especially efficient patterns to lower
7868 /// across all subtarget feature sets.
7869 static SDValue lowerVectorShuffleAsElementInsertion(
7870 SDLoc DL, MVT VT, SDValue V1, SDValue V2, ArrayRef<int> Mask,
7871 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
7872 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
7874 MVT EltVT = VT.getVectorElementType();
7876 int V2Index = std::find_if(Mask.begin(), Mask.end(),
7877 [&Mask](int M) { return M >= (int)Mask.size(); }) -
7879 bool IsV1Zeroable = true;
7880 for (int i = 0, Size = Mask.size(); i < Size; ++i)
7881 if (i != V2Index && !Zeroable[i]) {
7882 IsV1Zeroable = false;
7886 // Check for a single input from a SCALAR_TO_VECTOR node.
7887 // FIXME: All of this should be canonicalized into INSERT_VECTOR_ELT and
7888 // all the smarts here sunk into that routine. However, the current
7889 // lowering of BUILD_VECTOR makes that nearly impossible until the old
7890 // vector shuffle lowering is dead.
7891 SDValue V2S = getScalarValueForVectorElement(V2, Mask[V2Index] - Mask.size(),
7893 if (V2S && DAG.getTargetLoweringInfo().isTypeLegal(V2S.getValueType())) {
7894 // We need to zext the scalar if it is smaller than an i32.
7895 V2S = DAG.getBitcast(EltVT, V2S);
7896 if (EltVT == MVT::i8 || EltVT == MVT::i16) {
7897 // Using zext to expand a narrow element won't work for non-zero
7902 // Zero-extend directly to i32.
7904 V2S = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i32, V2S);
7906 V2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, ExtVT, V2S);
7907 } else if (Mask[V2Index] != (int)Mask.size() || EltVT == MVT::i8 ||
7908 EltVT == MVT::i16) {
7909 // Either not inserting from the low element of the input or the input
7910 // element size is too small to use VZEXT_MOVL to clear the high bits.
7914 if (!IsV1Zeroable) {
7915 // If V1 can't be treated as a zero vector we have fewer options to lower
7916 // this. We can't support integer vectors or non-zero targets cheaply, and
7917 // the V1 elements can't be permuted in any way.
7918 assert(VT == ExtVT && "Cannot change extended type when non-zeroable!");
7919 if (!VT.isFloatingPoint() || V2Index != 0)
7921 SmallVector<int, 8> V1Mask(Mask.begin(), Mask.end());
7922 V1Mask[V2Index] = -1;
7923 if (!isNoopShuffleMask(V1Mask))
7925 // This is essentially a special case blend operation, but if we have
7926 // general purpose blend operations, they are always faster. Bail and let
7927 // the rest of the lowering handle these as blends.
7928 if (Subtarget->hasSSE41())
7931 // Otherwise, use MOVSD or MOVSS.
7932 assert((EltVT == MVT::f32 || EltVT == MVT::f64) &&
7933 "Only two types of floating point element types to handle!");
7934 return DAG.getNode(EltVT == MVT::f32 ? X86ISD::MOVSS : X86ISD::MOVSD, DL,
7938 // This lowering only works for the low element with floating point vectors.
7939 if (VT.isFloatingPoint() && V2Index != 0)
7942 V2 = DAG.getNode(X86ISD::VZEXT_MOVL, DL, ExtVT, V2);
7944 V2 = DAG.getBitcast(VT, V2);
7947 // If we have 4 or fewer lanes we can cheaply shuffle the element into
7948 // the desired position. Otherwise it is more efficient to do a vector
7949 // shift left. We know that we can do a vector shift left because all
7950 // the inputs are zero.
7951 if (VT.isFloatingPoint() || VT.getVectorNumElements() <= 4) {
7952 SmallVector<int, 4> V2Shuffle(Mask.size(), 1);
7953 V2Shuffle[V2Index] = 0;
7954 V2 = DAG.getVectorShuffle(VT, DL, V2, DAG.getUNDEF(VT), V2Shuffle);
7956 V2 = DAG.getBitcast(MVT::v2i64, V2);
7958 X86ISD::VSHLDQ, DL, MVT::v2i64, V2,
7959 DAG.getConstant(V2Index * EltVT.getSizeInBits() / 8, DL,
7960 DAG.getTargetLoweringInfo().getScalarShiftAmountTy(
7961 DAG.getDataLayout(), VT)));
7962 V2 = DAG.getBitcast(VT, V2);
7968 /// \brief Try to lower broadcast of a single - truncated - integer element,
7969 /// coming from a scalar_to_vector/build_vector node \p V0 with larger elements.
7971 /// This assumes we have AVX2.
7972 static SDValue lowerVectorShuffleAsTruncBroadcast(SDLoc DL, MVT VT, SDValue V0,
7974 const X86Subtarget *Subtarget,
7975 SelectionDAG &DAG) {
7976 assert(Subtarget->hasAVX2() &&
7977 "We can only lower integer broadcasts with AVX2!");
7979 EVT EltVT = VT.getVectorElementType();
7980 EVT V0VT = V0.getValueType();
7982 assert(VT.isInteger() && "Unexpected non-integer trunc broadcast!");
7983 assert(V0VT.isVector() && "Unexpected non-vector vector-sized value!");
7985 EVT V0EltVT = V0VT.getVectorElementType();
7986 if (!V0EltVT.isInteger())
7989 const unsigned EltSize = EltVT.getSizeInBits();
7990 const unsigned V0EltSize = V0EltVT.getSizeInBits();
7992 // This is only a truncation if the original element type is larger.
7993 if (V0EltSize <= EltSize)
7996 assert(((V0EltSize % EltSize) == 0) &&
7997 "Scalar type sizes must all be powers of 2 on x86!");
7999 const unsigned V0Opc = V0.getOpcode();
8000 const unsigned Scale = V0EltSize / EltSize;
8001 const unsigned V0BroadcastIdx = BroadcastIdx / Scale;
8003 if ((V0Opc != ISD::SCALAR_TO_VECTOR || V0BroadcastIdx != 0) &&
8004 V0Opc != ISD::BUILD_VECTOR)
8007 SDValue Scalar = V0.getOperand(V0BroadcastIdx);
8009 // If we're extracting non-least-significant bits, shift so we can truncate.
8010 // Hopefully, we can fold away the trunc/srl/load into the broadcast.
8011 // Even if we can't (and !isShuffleFoldableLoad(Scalar)), prefer
8012 // vpbroadcast+vmovd+shr to vpshufb(m)+vmovd.
8013 if (const int OffsetIdx = BroadcastIdx % Scale)
8014 Scalar = DAG.getNode(ISD::SRL, DL, Scalar.getValueType(), Scalar,
8015 DAG.getConstant(OffsetIdx * EltSize, DL, Scalar.getValueType()));
8017 return DAG.getNode(X86ISD::VBROADCAST, DL, VT,
8018 DAG.getNode(ISD::TRUNCATE, DL, EltVT, Scalar));
8021 /// \brief Try to lower broadcast of a single element.
8023 /// For convenience, this code also bundles all of the subtarget feature set
8024 /// filtering. While a little annoying to re-dispatch on type here, there isn't
8025 /// a convenient way to factor it out.
8026 static SDValue lowerVectorShuffleAsBroadcast(SDLoc DL, MVT VT, SDValue V,
8028 const X86Subtarget *Subtarget,
8029 SelectionDAG &DAG) {
8030 if (!Subtarget->hasAVX())
8032 if (VT.isInteger() && !Subtarget->hasAVX2())
8035 // Check that the mask is a broadcast.
8036 int BroadcastIdx = -1;
8038 if (M >= 0 && BroadcastIdx == -1)
8040 else if (M >= 0 && M != BroadcastIdx)
8043 assert(BroadcastIdx < (int)Mask.size() && "We only expect to be called with "
8044 "a sorted mask where the broadcast "
8047 // Go up the chain of (vector) values to find a scalar load that we can
8048 // combine with the broadcast.
8050 switch (V.getOpcode()) {
8051 case ISD::CONCAT_VECTORS: {
8052 int OperandSize = Mask.size() / V.getNumOperands();
8053 V = V.getOperand(BroadcastIdx / OperandSize);
8054 BroadcastIdx %= OperandSize;
8058 case ISD::INSERT_SUBVECTOR: {
8059 SDValue VOuter = V.getOperand(0), VInner = V.getOperand(1);
8060 auto ConstantIdx = dyn_cast<ConstantSDNode>(V.getOperand(2));
8064 int BeginIdx = (int)ConstantIdx->getZExtValue();
8066 BeginIdx + (int)VInner.getSimpleValueType().getVectorNumElements();
8067 if (BroadcastIdx >= BeginIdx && BroadcastIdx < EndIdx) {
8068 BroadcastIdx -= BeginIdx;
8079 // Check if this is a broadcast of a scalar. We special case lowering
8080 // for scalars so that we can more effectively fold with loads.
8081 // First, look through bitcast: if the original value has a larger element
8082 // type than the shuffle, the broadcast element is in essence truncated.
8083 // Make that explicit to ease folding.
8084 if (V.getOpcode() == ISD::BITCAST && VT.isInteger())
8085 if (SDValue TruncBroadcast = lowerVectorShuffleAsTruncBroadcast(
8086 DL, VT, V.getOperand(0), BroadcastIdx, Subtarget, DAG))
8087 return TruncBroadcast;
8089 // Also check the simpler case, where we can directly reuse the scalar.
8090 if (V.getOpcode() == ISD::BUILD_VECTOR ||
8091 (V.getOpcode() == ISD::SCALAR_TO_VECTOR && BroadcastIdx == 0)) {
8092 V = V.getOperand(BroadcastIdx);
8094 // If the scalar isn't a load, we can't broadcast from it in AVX1.
8095 // Only AVX2 has register broadcasts.
8096 if (!Subtarget->hasAVX2() && !isShuffleFoldableLoad(V))
8098 } else if (BroadcastIdx != 0 || !Subtarget->hasAVX2()) {
8099 // We can't broadcast from a vector register without AVX2, and we can only
8100 // broadcast from the zero-element of a vector register.
8104 return DAG.getNode(X86ISD::VBROADCAST, DL, VT, V);
8107 // Check for whether we can use INSERTPS to perform the shuffle. We only use
8108 // INSERTPS when the V1 elements are already in the correct locations
8109 // because otherwise we can just always use two SHUFPS instructions which
8110 // are much smaller to encode than a SHUFPS and an INSERTPS. We can also
8111 // perform INSERTPS if a single V1 element is out of place and all V2
8112 // elements are zeroable.
8113 static SDValue lowerVectorShuffleAsInsertPS(SDValue Op, SDValue V1, SDValue V2,
8115 SelectionDAG &DAG) {
8116 assert(Op.getSimpleValueType() == MVT::v4f32 && "Bad shuffle type!");
8117 assert(V1.getSimpleValueType() == MVT::v4f32 && "Bad operand type!");
8118 assert(V2.getSimpleValueType() == MVT::v4f32 && "Bad operand type!");
8119 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
8121 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
8124 int V1DstIndex = -1;
8125 int V2DstIndex = -1;
8126 bool V1UsedInPlace = false;
8128 for (int i = 0; i < 4; ++i) {
8129 // Synthesize a zero mask from the zeroable elements (includes undefs).
8135 // Flag if we use any V1 inputs in place.
8137 V1UsedInPlace = true;
8141 // We can only insert a single non-zeroable element.
8142 if (V1DstIndex != -1 || V2DstIndex != -1)
8146 // V1 input out of place for insertion.
8149 // V2 input for insertion.
8154 // Don't bother if we have no (non-zeroable) element for insertion.
8155 if (V1DstIndex == -1 && V2DstIndex == -1)
8158 // Determine element insertion src/dst indices. The src index is from the
8159 // start of the inserted vector, not the start of the concatenated vector.
8160 unsigned V2SrcIndex = 0;
8161 if (V1DstIndex != -1) {
8162 // If we have a V1 input out of place, we use V1 as the V2 element insertion
8163 // and don't use the original V2 at all.
8164 V2SrcIndex = Mask[V1DstIndex];
8165 V2DstIndex = V1DstIndex;
8168 V2SrcIndex = Mask[V2DstIndex] - 4;
8171 // If no V1 inputs are used in place, then the result is created only from
8172 // the zero mask and the V2 insertion - so remove V1 dependency.
8174 V1 = DAG.getUNDEF(MVT::v4f32);
8176 unsigned InsertPSMask = V2SrcIndex << 6 | V2DstIndex << 4 | ZMask;
8177 assert((InsertPSMask & ~0xFFu) == 0 && "Invalid mask!");
8179 // Insert the V2 element into the desired position.
8181 return DAG.getNode(X86ISD::INSERTPS, DL, MVT::v4f32, V1, V2,
8182 DAG.getConstant(InsertPSMask, DL, MVT::i8));
8185 /// \brief Try to lower a shuffle as a permute of the inputs followed by an
8186 /// UNPCK instruction.
8188 /// This specifically targets cases where we end up with alternating between
8189 /// the two inputs, and so can permute them into something that feeds a single
8190 /// UNPCK instruction. Note that this routine only targets integer vectors
8191 /// because for floating point vectors we have a generalized SHUFPS lowering
8192 /// strategy that handles everything that doesn't *exactly* match an unpack,
8193 /// making this clever lowering unnecessary.
8194 static SDValue lowerVectorShuffleAsPermuteAndUnpack(SDLoc DL, MVT VT,
8195 SDValue V1, SDValue V2,
8197 SelectionDAG &DAG) {
8198 assert(!VT.isFloatingPoint() &&
8199 "This routine only supports integer vectors.");
8200 assert(!isSingleInputShuffleMask(Mask) &&
8201 "This routine should only be used when blending two inputs.");
8202 assert(Mask.size() >= 2 && "Single element masks are invalid.");
8204 int Size = Mask.size();
8206 int NumLoInputs = std::count_if(Mask.begin(), Mask.end(), [Size](int M) {
8207 return M >= 0 && M % Size < Size / 2;
8209 int NumHiInputs = std::count_if(
8210 Mask.begin(), Mask.end(), [Size](int M) { return M % Size >= Size / 2; });
8212 bool UnpackLo = NumLoInputs >= NumHiInputs;
8214 auto TryUnpack = [&](MVT UnpackVT, int Scale) {
8215 SmallVector<int, 32> V1Mask(Mask.size(), -1);
8216 SmallVector<int, 32> V2Mask(Mask.size(), -1);
8218 for (int i = 0; i < Size; ++i) {
8222 // Each element of the unpack contains Scale elements from this mask.
8223 int UnpackIdx = i / Scale;
8225 // We only handle the case where V1 feeds the first slots of the unpack.
8226 // We rely on canonicalization to ensure this is the case.
8227 if ((UnpackIdx % 2 == 0) != (Mask[i] < Size))
8230 // Setup the mask for this input. The indexing is tricky as we have to
8231 // handle the unpack stride.
8232 SmallVectorImpl<int> &VMask = (UnpackIdx % 2 == 0) ? V1Mask : V2Mask;
8233 VMask[(UnpackIdx / 2) * Scale + i % Scale + (UnpackLo ? 0 : Size / 2)] =
8237 // If we will have to shuffle both inputs to use the unpack, check whether
8238 // we can just unpack first and shuffle the result. If so, skip this unpack.
8239 if ((NumLoInputs == 0 || NumHiInputs == 0) && !isNoopShuffleMask(V1Mask) &&
8240 !isNoopShuffleMask(V2Mask))
8243 // Shuffle the inputs into place.
8244 V1 = DAG.getVectorShuffle(VT, DL, V1, DAG.getUNDEF(VT), V1Mask);
8245 V2 = DAG.getVectorShuffle(VT, DL, V2, DAG.getUNDEF(VT), V2Mask);
8247 // Cast the inputs to the type we will use to unpack them.
8248 V1 = DAG.getBitcast(UnpackVT, V1);
8249 V2 = DAG.getBitcast(UnpackVT, V2);
8251 // Unpack the inputs and cast the result back to the desired type.
8252 return DAG.getBitcast(
8253 VT, DAG.getNode(UnpackLo ? X86ISD::UNPCKL : X86ISD::UNPCKH, DL,
8257 // We try each unpack from the largest to the smallest to try and find one
8258 // that fits this mask.
8259 int OrigNumElements = VT.getVectorNumElements();
8260 int OrigScalarSize = VT.getScalarSizeInBits();
8261 for (int ScalarSize = 64; ScalarSize >= OrigScalarSize; ScalarSize /= 2) {
8262 int Scale = ScalarSize / OrigScalarSize;
8263 int NumElements = OrigNumElements / Scale;
8264 MVT UnpackVT = MVT::getVectorVT(MVT::getIntegerVT(ScalarSize), NumElements);
8265 if (SDValue Unpack = TryUnpack(UnpackVT, Scale))
8269 // If none of the unpack-rooted lowerings worked (or were profitable) try an
8271 if (NumLoInputs == 0 || NumHiInputs == 0) {
8272 assert((NumLoInputs > 0 || NumHiInputs > 0) &&
8273 "We have to have *some* inputs!");
8274 int HalfOffset = NumLoInputs == 0 ? Size / 2 : 0;
8276 // FIXME: We could consider the total complexity of the permute of each
8277 // possible unpacking. Or at the least we should consider how many
8278 // half-crossings are created.
8279 // FIXME: We could consider commuting the unpacks.
8281 SmallVector<int, 32> PermMask;
8282 PermMask.assign(Size, -1);
8283 for (int i = 0; i < Size; ++i) {
8287 assert(Mask[i] % Size >= HalfOffset && "Found input from wrong half!");
8290 2 * ((Mask[i] % Size) - HalfOffset) + (Mask[i] < Size ? 0 : 1);
8292 return DAG.getVectorShuffle(
8293 VT, DL, DAG.getNode(NumLoInputs == 0 ? X86ISD::UNPCKH : X86ISD::UNPCKL,
8295 DAG.getUNDEF(VT), PermMask);
8301 /// \brief Handle lowering of 2-lane 64-bit floating point shuffles.
8303 /// This is the basis function for the 2-lane 64-bit shuffles as we have full
8304 /// support for floating point shuffles but not integer shuffles. These
8305 /// instructions will incur a domain crossing penalty on some chips though so
8306 /// it is better to avoid lowering through this for integer vectors where
8308 static SDValue lowerV2F64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
8309 const X86Subtarget *Subtarget,
8310 SelectionDAG &DAG) {
8312 assert(Op.getSimpleValueType() == MVT::v2f64 && "Bad shuffle type!");
8313 assert(V1.getSimpleValueType() == MVT::v2f64 && "Bad operand type!");
8314 assert(V2.getSimpleValueType() == MVT::v2f64 && "Bad operand type!");
8315 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
8316 ArrayRef<int> Mask = SVOp->getMask();
8317 assert(Mask.size() == 2 && "Unexpected mask size for v2 shuffle!");
8319 if (isSingleInputShuffleMask(Mask)) {
8320 // Use low duplicate instructions for masks that match their pattern.
8321 if (Subtarget->hasSSE3())
8322 if (isShuffleEquivalent(V1, V2, Mask, {0, 0}))
8323 return DAG.getNode(X86ISD::MOVDDUP, DL, MVT::v2f64, V1);
8325 // Straight shuffle of a single input vector. Simulate this by using the
8326 // single input as both of the "inputs" to this instruction..
8327 unsigned SHUFPDMask = (Mask[0] == 1) | ((Mask[1] == 1) << 1);
8329 if (Subtarget->hasAVX()) {
8330 // If we have AVX, we can use VPERMILPS which will allow folding a load
8331 // into the shuffle.
8332 return DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v2f64, V1,
8333 DAG.getConstant(SHUFPDMask, DL, MVT::i8));
8336 return DAG.getNode(X86ISD::SHUFP, DL, MVT::v2f64, V1, V1,
8337 DAG.getConstant(SHUFPDMask, DL, MVT::i8));
8339 assert(Mask[0] >= 0 && Mask[0] < 2 && "Non-canonicalized blend!");
8340 assert(Mask[1] >= 2 && "Non-canonicalized blend!");
8342 // If we have a single input, insert that into V1 if we can do so cheaply.
8343 if ((Mask[0] >= 2) + (Mask[1] >= 2) == 1) {
8344 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
8345 DL, MVT::v2f64, V1, V2, Mask, Subtarget, DAG))
8347 // Try inverting the insertion since for v2 masks it is easy to do and we
8348 // can't reliably sort the mask one way or the other.
8349 int InverseMask[2] = {Mask[0] < 0 ? -1 : (Mask[0] ^ 2),
8350 Mask[1] < 0 ? -1 : (Mask[1] ^ 2)};
8351 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
8352 DL, MVT::v2f64, V2, V1, InverseMask, Subtarget, DAG))
8356 // Try to use one of the special instruction patterns to handle two common
8357 // blend patterns if a zero-blend above didn't work.
8358 if (isShuffleEquivalent(V1, V2, Mask, {0, 3}) ||
8359 isShuffleEquivalent(V1, V2, Mask, {1, 3}))
8360 if (SDValue V1S = getScalarValueForVectorElement(V1, Mask[0], DAG))
8361 // We can either use a special instruction to load over the low double or
8362 // to move just the low double.
8364 isShuffleFoldableLoad(V1S) ? X86ISD::MOVLPD : X86ISD::MOVSD,
8366 DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, MVT::v2f64, V1S));
8368 if (Subtarget->hasSSE41())
8369 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v2f64, V1, V2, Mask,
8373 // Use dedicated unpack instructions for masks that match their pattern.
8375 lowerVectorShuffleWithUNPCK(DL, MVT::v2f64, Mask, V1, V2, DAG))
8378 unsigned SHUFPDMask = (Mask[0] == 1) | (((Mask[1] - 2) == 1) << 1);
8379 return DAG.getNode(X86ISD::SHUFP, DL, MVT::v2f64, V1, V2,
8380 DAG.getConstant(SHUFPDMask, DL, MVT::i8));
8383 /// \brief Handle lowering of 2-lane 64-bit integer shuffles.
8385 /// Tries to lower a 2-lane 64-bit shuffle using shuffle operations provided by
8386 /// the integer unit to minimize domain crossing penalties. However, for blends
8387 /// it falls back to the floating point shuffle operation with appropriate bit
8389 static SDValue lowerV2I64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
8390 const X86Subtarget *Subtarget,
8391 SelectionDAG &DAG) {
8393 assert(Op.getSimpleValueType() == MVT::v2i64 && "Bad shuffle type!");
8394 assert(V1.getSimpleValueType() == MVT::v2i64 && "Bad operand type!");
8395 assert(V2.getSimpleValueType() == MVT::v2i64 && "Bad operand type!");
8396 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
8397 ArrayRef<int> Mask = SVOp->getMask();
8398 assert(Mask.size() == 2 && "Unexpected mask size for v2 shuffle!");
8400 if (isSingleInputShuffleMask(Mask)) {
8401 // Check for being able to broadcast a single element.
8402 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v2i64, V1,
8403 Mask, Subtarget, DAG))
8406 // Straight shuffle of a single input vector. For everything from SSE2
8407 // onward this has a single fast instruction with no scary immediates.
8408 // We have to map the mask as it is actually a v4i32 shuffle instruction.
8409 V1 = DAG.getBitcast(MVT::v4i32, V1);
8410 int WidenedMask[4] = {
8411 std::max(Mask[0], 0) * 2, std::max(Mask[0], 0) * 2 + 1,
8412 std::max(Mask[1], 0) * 2, std::max(Mask[1], 0) * 2 + 1};
8413 return DAG.getBitcast(
8415 DAG.getNode(X86ISD::PSHUFD, DL, MVT::v4i32, V1,
8416 getV4X86ShuffleImm8ForMask(WidenedMask, DL, DAG)));
8418 assert(Mask[0] != -1 && "No undef lanes in multi-input v2 shuffles!");
8419 assert(Mask[1] != -1 && "No undef lanes in multi-input v2 shuffles!");
8420 assert(Mask[0] < 2 && "We sort V1 to be the first input.");
8421 assert(Mask[1] >= 2 && "We sort V2 to be the second input.");
8423 // If we have a blend of two PACKUS operations an the blend aligns with the
8424 // low and half halves, we can just merge the PACKUS operations. This is
8425 // particularly important as it lets us merge shuffles that this routine itself
8427 auto GetPackNode = [](SDValue V) {
8428 while (V.getOpcode() == ISD::BITCAST)
8429 V = V.getOperand(0);
8431 return V.getOpcode() == X86ISD::PACKUS ? V : SDValue();
8433 if (SDValue V1Pack = GetPackNode(V1))
8434 if (SDValue V2Pack = GetPackNode(V2))
8435 return DAG.getBitcast(MVT::v2i64,
8436 DAG.getNode(X86ISD::PACKUS, DL, MVT::v16i8,
8437 Mask[0] == 0 ? V1Pack.getOperand(0)
8438 : V1Pack.getOperand(1),
8439 Mask[1] == 2 ? V2Pack.getOperand(0)
8440 : V2Pack.getOperand(1)));
8442 // Try to use shift instructions.
8444 lowerVectorShuffleAsShift(DL, MVT::v2i64, V1, V2, Mask, DAG))
8447 // When loading a scalar and then shuffling it into a vector we can often do
8448 // the insertion cheaply.
8449 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
8450 DL, MVT::v2i64, V1, V2, Mask, Subtarget, DAG))
8452 // Try inverting the insertion since for v2 masks it is easy to do and we
8453 // can't reliably sort the mask one way or the other.
8454 int InverseMask[2] = {Mask[0] ^ 2, Mask[1] ^ 2};
8455 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
8456 DL, MVT::v2i64, V2, V1, InverseMask, Subtarget, DAG))
8459 // We have different paths for blend lowering, but they all must use the
8460 // *exact* same predicate.
8461 bool IsBlendSupported = Subtarget->hasSSE41();
8462 if (IsBlendSupported)
8463 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v2i64, V1, V2, Mask,
8467 // Use dedicated unpack instructions for masks that match their pattern.
8469 lowerVectorShuffleWithUNPCK(DL, MVT::v2i64, Mask, V1, V2, DAG))
8472 // Try to use byte rotation instructions.
8473 // Its more profitable for pre-SSSE3 to use shuffles/unpacks.
8474 if (Subtarget->hasSSSE3())
8475 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
8476 DL, MVT::v2i64, V1, V2, Mask, Subtarget, DAG))
8479 // If we have direct support for blends, we should lower by decomposing into
8480 // a permute. That will be faster than the domain cross.
8481 if (IsBlendSupported)
8482 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v2i64, V1, V2,
8485 // We implement this with SHUFPD which is pretty lame because it will likely
8486 // incur 2 cycles of stall for integer vectors on Nehalem and older chips.
8487 // However, all the alternatives are still more cycles and newer chips don't
8488 // have this problem. It would be really nice if x86 had better shuffles here.
8489 V1 = DAG.getBitcast(MVT::v2f64, V1);
8490 V2 = DAG.getBitcast(MVT::v2f64, V2);
8491 return DAG.getBitcast(MVT::v2i64,
8492 DAG.getVectorShuffle(MVT::v2f64, DL, V1, V2, Mask));
8495 /// \brief Test whether this can be lowered with a single SHUFPS instruction.
8497 /// This is used to disable more specialized lowerings when the shufps lowering
8498 /// will happen to be efficient.
8499 static bool isSingleSHUFPSMask(ArrayRef<int> Mask) {
8500 // This routine only handles 128-bit shufps.
8501 assert(Mask.size() == 4 && "Unsupported mask size!");
8503 // To lower with a single SHUFPS we need to have the low half and high half
8504 // each requiring a single input.
8505 if (Mask[0] != -1 && Mask[1] != -1 && (Mask[0] < 4) != (Mask[1] < 4))
8507 if (Mask[2] != -1 && Mask[3] != -1 && (Mask[2] < 4) != (Mask[3] < 4))
8513 /// \brief Lower a vector shuffle using the SHUFPS instruction.
8515 /// This is a helper routine dedicated to lowering vector shuffles using SHUFPS.
8516 /// It makes no assumptions about whether this is the *best* lowering, it simply
8518 static SDValue lowerVectorShuffleWithSHUFPS(SDLoc DL, MVT VT,
8519 ArrayRef<int> Mask, SDValue V1,
8520 SDValue V2, SelectionDAG &DAG) {
8521 SDValue LowV = V1, HighV = V2;
8522 int NewMask[4] = {Mask[0], Mask[1], Mask[2], Mask[3]};
8525 std::count_if(Mask.begin(), Mask.end(), [](int M) { return M >= 4; });
8527 if (NumV2Elements == 1) {
8529 std::find_if(Mask.begin(), Mask.end(), [](int M) { return M >= 4; }) -
8532 // Compute the index adjacent to V2Index and in the same half by toggling
8534 int V2AdjIndex = V2Index ^ 1;
8536 if (Mask[V2AdjIndex] == -1) {
8537 // Handles all the cases where we have a single V2 element and an undef.
8538 // This will only ever happen in the high lanes because we commute the
8539 // vector otherwise.
8541 std::swap(LowV, HighV);
8542 NewMask[V2Index] -= 4;
8544 // Handle the case where the V2 element ends up adjacent to a V1 element.
8545 // To make this work, blend them together as the first step.
8546 int V1Index = V2AdjIndex;
8547 int BlendMask[4] = {Mask[V2Index] - 4, 0, Mask[V1Index], 0};
8548 V2 = DAG.getNode(X86ISD::SHUFP, DL, VT, V2, V1,
8549 getV4X86ShuffleImm8ForMask(BlendMask, DL, DAG));
8551 // Now proceed to reconstruct the final blend as we have the necessary
8552 // high or low half formed.
8559 NewMask[V1Index] = 2; // We put the V1 element in V2[2].
8560 NewMask[V2Index] = 0; // We shifted the V2 element into V2[0].
8562 } else if (NumV2Elements == 2) {
8563 if (Mask[0] < 4 && Mask[1] < 4) {
8564 // Handle the easy case where we have V1 in the low lanes and V2 in the
8568 } else if (Mask[2] < 4 && Mask[3] < 4) {
8569 // We also handle the reversed case because this utility may get called
8570 // when we detect a SHUFPS pattern but can't easily commute the shuffle to
8571 // arrange things in the right direction.
8577 // We have a mixture of V1 and V2 in both low and high lanes. Rather than
8578 // trying to place elements directly, just blend them and set up the final
8579 // shuffle to place them.
8581 // The first two blend mask elements are for V1, the second two are for
8583 int BlendMask[4] = {Mask[0] < 4 ? Mask[0] : Mask[1],
8584 Mask[2] < 4 ? Mask[2] : Mask[3],
8585 (Mask[0] >= 4 ? Mask[0] : Mask[1]) - 4,
8586 (Mask[2] >= 4 ? Mask[2] : Mask[3]) - 4};
8587 V1 = DAG.getNode(X86ISD::SHUFP, DL, VT, V1, V2,
8588 getV4X86ShuffleImm8ForMask(BlendMask, DL, DAG));
8590 // Now we do a normal shuffle of V1 by giving V1 as both operands to
8593 NewMask[0] = Mask[0] < 4 ? 0 : 2;
8594 NewMask[1] = Mask[0] < 4 ? 2 : 0;
8595 NewMask[2] = Mask[2] < 4 ? 1 : 3;
8596 NewMask[3] = Mask[2] < 4 ? 3 : 1;
8599 return DAG.getNode(X86ISD::SHUFP, DL, VT, LowV, HighV,
8600 getV4X86ShuffleImm8ForMask(NewMask, DL, DAG));
8603 /// \brief Lower 4-lane 32-bit floating point shuffles.
8605 /// Uses instructions exclusively from the floating point unit to minimize
8606 /// domain crossing penalties, as these are sufficient to implement all v4f32
8608 static SDValue lowerV4F32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
8609 const X86Subtarget *Subtarget,
8610 SelectionDAG &DAG) {
8612 assert(Op.getSimpleValueType() == MVT::v4f32 && "Bad shuffle type!");
8613 assert(V1.getSimpleValueType() == MVT::v4f32 && "Bad operand type!");
8614 assert(V2.getSimpleValueType() == MVT::v4f32 && "Bad operand type!");
8615 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
8616 ArrayRef<int> Mask = SVOp->getMask();
8617 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
8620 std::count_if(Mask.begin(), Mask.end(), [](int M) { return M >= 4; });
8622 if (NumV2Elements == 0) {
8623 // Check for being able to broadcast a single element.
8624 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v4f32, V1,
8625 Mask, Subtarget, DAG))
8628 // Use even/odd duplicate instructions for masks that match their pattern.
8629 if (Subtarget->hasSSE3()) {
8630 if (isShuffleEquivalent(V1, V2, Mask, {0, 0, 2, 2}))
8631 return DAG.getNode(X86ISD::MOVSLDUP, DL, MVT::v4f32, V1);
8632 if (isShuffleEquivalent(V1, V2, Mask, {1, 1, 3, 3}))
8633 return DAG.getNode(X86ISD::MOVSHDUP, DL, MVT::v4f32, V1);
8636 if (Subtarget->hasAVX()) {
8637 // If we have AVX, we can use VPERMILPS which will allow folding a load
8638 // into the shuffle.
8639 return DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v4f32, V1,
8640 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
8643 // Otherwise, use a straight shuffle of a single input vector. We pass the
8644 // input vector to both operands to simulate this with a SHUFPS.
8645 return DAG.getNode(X86ISD::SHUFP, DL, MVT::v4f32, V1, V1,
8646 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
8649 // There are special ways we can lower some single-element blends. However, we
8650 // have custom ways we can lower more complex single-element blends below that
8651 // we defer to if both this and BLENDPS fail to match, so restrict this to
8652 // when the V2 input is targeting element 0 of the mask -- that is the fast
8654 if (NumV2Elements == 1 && Mask[0] >= 4)
8655 if (SDValue V = lowerVectorShuffleAsElementInsertion(DL, MVT::v4f32, V1, V2,
8656 Mask, Subtarget, DAG))
8659 if (Subtarget->hasSSE41()) {
8660 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v4f32, V1, V2, Mask,
8664 // Use INSERTPS if we can complete the shuffle efficiently.
8665 if (SDValue V = lowerVectorShuffleAsInsertPS(Op, V1, V2, Mask, DAG))
8668 if (!isSingleSHUFPSMask(Mask))
8669 if (SDValue BlendPerm = lowerVectorShuffleAsBlendAndPermute(
8670 DL, MVT::v4f32, V1, V2, Mask, DAG))
8674 // Use dedicated unpack instructions for masks that match their pattern.
8676 lowerVectorShuffleWithUNPCK(DL, MVT::v4f32, Mask, V1, V2, DAG))
8679 // Otherwise fall back to a SHUFPS lowering strategy.
8680 return lowerVectorShuffleWithSHUFPS(DL, MVT::v4f32, Mask, V1, V2, DAG);
8683 /// \brief Lower 4-lane i32 vector shuffles.
8685 /// We try to handle these with integer-domain shuffles where we can, but for
8686 /// blends we use the floating point domain blend instructions.
8687 static SDValue lowerV4I32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
8688 const X86Subtarget *Subtarget,
8689 SelectionDAG &DAG) {
8691 assert(Op.getSimpleValueType() == MVT::v4i32 && "Bad shuffle type!");
8692 assert(V1.getSimpleValueType() == MVT::v4i32 && "Bad operand type!");
8693 assert(V2.getSimpleValueType() == MVT::v4i32 && "Bad operand type!");
8694 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
8695 ArrayRef<int> Mask = SVOp->getMask();
8696 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
8698 // Whenever we can lower this as a zext, that instruction is strictly faster
8699 // than any alternative. It also allows us to fold memory operands into the
8700 // shuffle in many cases.
8701 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(DL, MVT::v4i32, V1, V2,
8702 Mask, Subtarget, DAG))
8706 std::count_if(Mask.begin(), Mask.end(), [](int M) { return M >= 4; });
8708 if (NumV2Elements == 0) {
8709 // Check for being able to broadcast a single element.
8710 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v4i32, V1,
8711 Mask, Subtarget, DAG))
8714 // Straight shuffle of a single input vector. For everything from SSE2
8715 // onward this has a single fast instruction with no scary immediates.
8716 // We coerce the shuffle pattern to be compatible with UNPCK instructions
8717 // but we aren't actually going to use the UNPCK instruction because doing
8718 // so prevents folding a load into this instruction or making a copy.
8719 const int UnpackLoMask[] = {0, 0, 1, 1};
8720 const int UnpackHiMask[] = {2, 2, 3, 3};
8721 if (isShuffleEquivalent(V1, V2, Mask, {0, 0, 1, 1}))
8722 Mask = UnpackLoMask;
8723 else if (isShuffleEquivalent(V1, V2, Mask, {2, 2, 3, 3}))
8724 Mask = UnpackHiMask;
8726 return DAG.getNode(X86ISD::PSHUFD, DL, MVT::v4i32, V1,
8727 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
8730 // Try to use shift instructions.
8732 lowerVectorShuffleAsShift(DL, MVT::v4i32, V1, V2, Mask, DAG))
8735 // There are special ways we can lower some single-element blends.
8736 if (NumV2Elements == 1)
8737 if (SDValue V = lowerVectorShuffleAsElementInsertion(DL, MVT::v4i32, V1, V2,
8738 Mask, Subtarget, DAG))
8741 // We have different paths for blend lowering, but they all must use the
8742 // *exact* same predicate.
8743 bool IsBlendSupported = Subtarget->hasSSE41();
8744 if (IsBlendSupported)
8745 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v4i32, V1, V2, Mask,
8749 if (SDValue Masked =
8750 lowerVectorShuffleAsBitMask(DL, MVT::v4i32, V1, V2, Mask, DAG))
8753 // Use dedicated unpack instructions for masks that match their pattern.
8755 lowerVectorShuffleWithUNPCK(DL, MVT::v4i32, Mask, V1, V2, DAG))
8758 // Try to use byte rotation instructions.
8759 // Its more profitable for pre-SSSE3 to use shuffles/unpacks.
8760 if (Subtarget->hasSSSE3())
8761 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
8762 DL, MVT::v4i32, V1, V2, Mask, Subtarget, DAG))
8765 // If we have direct support for blends, we should lower by decomposing into
8766 // a permute. That will be faster than the domain cross.
8767 if (IsBlendSupported)
8768 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v4i32, V1, V2,
8771 // Try to lower by permuting the inputs into an unpack instruction.
8772 if (SDValue Unpack = lowerVectorShuffleAsPermuteAndUnpack(DL, MVT::v4i32, V1,
8776 // We implement this with SHUFPS because it can blend from two vectors.
8777 // Because we're going to eventually use SHUFPS, we use SHUFPS even to build
8778 // up the inputs, bypassing domain shift penalties that we would encur if we
8779 // directly used PSHUFD on Nehalem and older. For newer chips, this isn't
8781 return DAG.getBitcast(
8783 DAG.getVectorShuffle(MVT::v4f32, DL, DAG.getBitcast(MVT::v4f32, V1),
8784 DAG.getBitcast(MVT::v4f32, V2), Mask));
8787 /// \brief Lowering of single-input v8i16 shuffles is the cornerstone of SSE2
8788 /// shuffle lowering, and the most complex part.
8790 /// The lowering strategy is to try to form pairs of input lanes which are
8791 /// targeted at the same half of the final vector, and then use a dword shuffle
8792 /// to place them onto the right half, and finally unpack the paired lanes into
8793 /// their final position.
8795 /// The exact breakdown of how to form these dword pairs and align them on the
8796 /// correct sides is really tricky. See the comments within the function for
8797 /// more of the details.
8799 /// This code also handles repeated 128-bit lanes of v8i16 shuffles, but each
8800 /// lane must shuffle the *exact* same way. In fact, you must pass a v8 Mask to
8801 /// this routine for it to work correctly. To shuffle a 256-bit or 512-bit i16
8802 /// vector, form the analogous 128-bit 8-element Mask.
8803 static SDValue lowerV8I16GeneralSingleInputVectorShuffle(
8804 SDLoc DL, MVT VT, SDValue V, MutableArrayRef<int> Mask,
8805 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
8806 assert(VT.getVectorElementType() == MVT::i16 && "Bad input type!");
8807 MVT PSHUFDVT = MVT::getVectorVT(MVT::i32, VT.getVectorNumElements() / 2);
8809 assert(Mask.size() == 8 && "Shuffle mask length doen't match!");
8810 MutableArrayRef<int> LoMask = Mask.slice(0, 4);
8811 MutableArrayRef<int> HiMask = Mask.slice(4, 4);
8813 SmallVector<int, 4> LoInputs;
8814 std::copy_if(LoMask.begin(), LoMask.end(), std::back_inserter(LoInputs),
8815 [](int M) { return M >= 0; });
8816 std::sort(LoInputs.begin(), LoInputs.end());
8817 LoInputs.erase(std::unique(LoInputs.begin(), LoInputs.end()), LoInputs.end());
8818 SmallVector<int, 4> HiInputs;
8819 std::copy_if(HiMask.begin(), HiMask.end(), std::back_inserter(HiInputs),
8820 [](int M) { return M >= 0; });
8821 std::sort(HiInputs.begin(), HiInputs.end());
8822 HiInputs.erase(std::unique(HiInputs.begin(), HiInputs.end()), HiInputs.end());
8824 std::lower_bound(LoInputs.begin(), LoInputs.end(), 4) - LoInputs.begin();
8825 int NumHToL = LoInputs.size() - NumLToL;
8827 std::lower_bound(HiInputs.begin(), HiInputs.end(), 4) - HiInputs.begin();
8828 int NumHToH = HiInputs.size() - NumLToH;
8829 MutableArrayRef<int> LToLInputs(LoInputs.data(), NumLToL);
8830 MutableArrayRef<int> LToHInputs(HiInputs.data(), NumLToH);
8831 MutableArrayRef<int> HToLInputs(LoInputs.data() + NumLToL, NumHToL);
8832 MutableArrayRef<int> HToHInputs(HiInputs.data() + NumLToH, NumHToH);
8834 // Simplify the 1-into-3 and 3-into-1 cases with a single pshufd. For all
8835 // such inputs we can swap two of the dwords across the half mark and end up
8836 // with <=2 inputs to each half in each half. Once there, we can fall through
8837 // to the generic code below. For example:
8839 // Input: [a, b, c, d, e, f, g, h] -PSHUFD[0,2,1,3]-> [a, b, e, f, c, d, g, h]
8840 // Mask: [0, 1, 2, 7, 4, 5, 6, 3] -----------------> [0, 1, 4, 7, 2, 3, 6, 5]
8842 // However in some very rare cases we have a 1-into-3 or 3-into-1 on one half
8843 // and an existing 2-into-2 on the other half. In this case we may have to
8844 // pre-shuffle the 2-into-2 half to avoid turning it into a 3-into-1 or
8845 // 1-into-3 which could cause us to cycle endlessly fixing each side in turn.
8846 // Fortunately, we don't have to handle anything but a 2-into-2 pattern
8847 // because any other situation (including a 3-into-1 or 1-into-3 in the other
8848 // half than the one we target for fixing) will be fixed when we re-enter this
8849 // path. We will also combine away any sequence of PSHUFD instructions that
8850 // result into a single instruction. Here is an example of the tricky case:
8852 // Input: [a, b, c, d, e, f, g, h] -PSHUFD[0,2,1,3]-> [a, b, e, f, c, d, g, h]
8853 // Mask: [3, 7, 1, 0, 2, 7, 3, 5] -THIS-IS-BAD!!!!-> [5, 7, 1, 0, 4, 7, 5, 3]
8855 // This now has a 1-into-3 in the high half! Instead, we do two shuffles:
8857 // Input: [a, b, c, d, e, f, g, h] PSHUFHW[0,2,1,3]-> [a, b, c, d, e, g, f, h]
8858 // Mask: [3, 7, 1, 0, 2, 7, 3, 5] -----------------> [3, 7, 1, 0, 2, 7, 3, 6]
8860 // Input: [a, b, c, d, e, g, f, h] -PSHUFD[0,2,1,3]-> [a, b, e, g, c, d, f, h]
8861 // Mask: [3, 7, 1, 0, 2, 7, 3, 6] -----------------> [5, 7, 1, 0, 4, 7, 5, 6]
8863 // The result is fine to be handled by the generic logic.
8864 auto balanceSides = [&](ArrayRef<int> AToAInputs, ArrayRef<int> BToAInputs,
8865 ArrayRef<int> BToBInputs, ArrayRef<int> AToBInputs,
8866 int AOffset, int BOffset) {
8867 assert((AToAInputs.size() == 3 || AToAInputs.size() == 1) &&
8868 "Must call this with A having 3 or 1 inputs from the A half.");
8869 assert((BToAInputs.size() == 1 || BToAInputs.size() == 3) &&
8870 "Must call this with B having 1 or 3 inputs from the B half.");
8871 assert(AToAInputs.size() + BToAInputs.size() == 4 &&
8872 "Must call this with either 3:1 or 1:3 inputs (summing to 4).");
8874 bool ThreeAInputs = AToAInputs.size() == 3;
8876 // Compute the index of dword with only one word among the three inputs in
8877 // a half by taking the sum of the half with three inputs and subtracting
8878 // the sum of the actual three inputs. The difference is the remaining
8881 int &TripleDWord = ThreeAInputs ? ADWord : BDWord;
8882 int &OneInputDWord = ThreeAInputs ? BDWord : ADWord;
8883 int TripleInputOffset = ThreeAInputs ? AOffset : BOffset;
8884 ArrayRef<int> TripleInputs = ThreeAInputs ? AToAInputs : BToAInputs;
8885 int OneInput = ThreeAInputs ? BToAInputs[0] : AToAInputs[0];
8886 int TripleInputSum = 0 + 1 + 2 + 3 + (4 * TripleInputOffset);
8887 int TripleNonInputIdx =
8888 TripleInputSum - std::accumulate(TripleInputs.begin(), TripleInputs.end(), 0);
8889 TripleDWord = TripleNonInputIdx / 2;
8891 // We use xor with one to compute the adjacent DWord to whichever one the
8893 OneInputDWord = (OneInput / 2) ^ 1;
8895 // Check for one tricky case: We're fixing a 3<-1 or a 1<-3 shuffle for AToA
8896 // and BToA inputs. If there is also such a problem with the BToB and AToB
8897 // inputs, we don't try to fix it necessarily -- we'll recurse and see it in
8898 // the next pass. However, if we have a 2<-2 in the BToB and AToB inputs, it
8899 // is essential that we don't *create* a 3<-1 as then we might oscillate.
8900 if (BToBInputs.size() == 2 && AToBInputs.size() == 2) {
8901 // Compute how many inputs will be flipped by swapping these DWords. We
8903 // to balance this to ensure we don't form a 3-1 shuffle in the other
8905 int NumFlippedAToBInputs =
8906 std::count(AToBInputs.begin(), AToBInputs.end(), 2 * ADWord) +
8907 std::count(AToBInputs.begin(), AToBInputs.end(), 2 * ADWord + 1);
8908 int NumFlippedBToBInputs =
8909 std::count(BToBInputs.begin(), BToBInputs.end(), 2 * BDWord) +
8910 std::count(BToBInputs.begin(), BToBInputs.end(), 2 * BDWord + 1);
8911 if ((NumFlippedAToBInputs == 1 &&
8912 (NumFlippedBToBInputs == 0 || NumFlippedBToBInputs == 2)) ||
8913 (NumFlippedBToBInputs == 1 &&
8914 (NumFlippedAToBInputs == 0 || NumFlippedAToBInputs == 2))) {
8915 // We choose whether to fix the A half or B half based on whether that
8916 // half has zero flipped inputs. At zero, we may not be able to fix it
8917 // with that half. We also bias towards fixing the B half because that
8918 // will more commonly be the high half, and we have to bias one way.
8919 auto FixFlippedInputs = [&V, &DL, &Mask, &DAG](int PinnedIdx, int DWord,
8920 ArrayRef<int> Inputs) {
8921 int FixIdx = PinnedIdx ^ 1; // The adjacent slot to the pinned slot.
8922 bool IsFixIdxInput = std::find(Inputs.begin(), Inputs.end(),
8923 PinnedIdx ^ 1) != Inputs.end();
8924 // Determine whether the free index is in the flipped dword or the
8925 // unflipped dword based on where the pinned index is. We use this bit
8926 // in an xor to conditionally select the adjacent dword.
8927 int FixFreeIdx = 2 * (DWord ^ (PinnedIdx / 2 == DWord));
8928 bool IsFixFreeIdxInput = std::find(Inputs.begin(), Inputs.end(),
8929 FixFreeIdx) != Inputs.end();
8930 if (IsFixIdxInput == IsFixFreeIdxInput)
8932 IsFixFreeIdxInput = std::find(Inputs.begin(), Inputs.end(),
8933 FixFreeIdx) != Inputs.end();
8934 assert(IsFixIdxInput != IsFixFreeIdxInput &&
8935 "We need to be changing the number of flipped inputs!");
8936 int PSHUFHalfMask[] = {0, 1, 2, 3};
8937 std::swap(PSHUFHalfMask[FixFreeIdx % 4], PSHUFHalfMask[FixIdx % 4]);
8938 V = DAG.getNode(FixIdx < 4 ? X86ISD::PSHUFLW : X86ISD::PSHUFHW, DL,
8940 getV4X86ShuffleImm8ForMask(PSHUFHalfMask, DL, DAG));
8943 if (M != -1 && M == FixIdx)
8945 else if (M != -1 && M == FixFreeIdx)
8948 if (NumFlippedBToBInputs != 0) {
8950 BToAInputs.size() == 3 ? TripleNonInputIdx : OneInput;
8951 FixFlippedInputs(BPinnedIdx, BDWord, BToBInputs);
8953 assert(NumFlippedAToBInputs != 0 && "Impossible given predicates!");
8954 int APinnedIdx = ThreeAInputs ? TripleNonInputIdx : OneInput;
8955 FixFlippedInputs(APinnedIdx, ADWord, AToBInputs);
8960 int PSHUFDMask[] = {0, 1, 2, 3};
8961 PSHUFDMask[ADWord] = BDWord;
8962 PSHUFDMask[BDWord] = ADWord;
8965 DAG.getNode(X86ISD::PSHUFD, DL, PSHUFDVT, DAG.getBitcast(PSHUFDVT, V),
8966 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG)));
8968 // Adjust the mask to match the new locations of A and B.
8970 if (M != -1 && M/2 == ADWord)
8971 M = 2 * BDWord + M % 2;
8972 else if (M != -1 && M/2 == BDWord)
8973 M = 2 * ADWord + M % 2;
8975 // Recurse back into this routine to re-compute state now that this isn't
8976 // a 3 and 1 problem.
8977 return lowerV8I16GeneralSingleInputVectorShuffle(DL, VT, V, Mask, Subtarget,
8980 if ((NumLToL == 3 && NumHToL == 1) || (NumLToL == 1 && NumHToL == 3))
8981 return balanceSides(LToLInputs, HToLInputs, HToHInputs, LToHInputs, 0, 4);
8982 else if ((NumHToH == 3 && NumLToH == 1) || (NumHToH == 1 && NumLToH == 3))
8983 return balanceSides(HToHInputs, LToHInputs, LToLInputs, HToLInputs, 4, 0);
8985 // At this point there are at most two inputs to the low and high halves from
8986 // each half. That means the inputs can always be grouped into dwords and
8987 // those dwords can then be moved to the correct half with a dword shuffle.
8988 // We use at most one low and one high word shuffle to collect these paired
8989 // inputs into dwords, and finally a dword shuffle to place them.
8990 int PSHUFLMask[4] = {-1, -1, -1, -1};
8991 int PSHUFHMask[4] = {-1, -1, -1, -1};
8992 int PSHUFDMask[4] = {-1, -1, -1, -1};
8994 // First fix the masks for all the inputs that are staying in their
8995 // original halves. This will then dictate the targets of the cross-half
8997 auto fixInPlaceInputs =
8998 [&PSHUFDMask](ArrayRef<int> InPlaceInputs, ArrayRef<int> IncomingInputs,
8999 MutableArrayRef<int> SourceHalfMask,
9000 MutableArrayRef<int> HalfMask, int HalfOffset) {
9001 if (InPlaceInputs.empty())
9003 if (InPlaceInputs.size() == 1) {
9004 SourceHalfMask[InPlaceInputs[0] - HalfOffset] =
9005 InPlaceInputs[0] - HalfOffset;
9006 PSHUFDMask[InPlaceInputs[0] / 2] = InPlaceInputs[0] / 2;
9009 if (IncomingInputs.empty()) {
9010 // Just fix all of the in place inputs.
9011 for (int Input : InPlaceInputs) {
9012 SourceHalfMask[Input - HalfOffset] = Input - HalfOffset;
9013 PSHUFDMask[Input / 2] = Input / 2;
9018 assert(InPlaceInputs.size() == 2 && "Cannot handle 3 or 4 inputs!");
9019 SourceHalfMask[InPlaceInputs[0] - HalfOffset] =
9020 InPlaceInputs[0] - HalfOffset;
9021 // Put the second input next to the first so that they are packed into
9022 // a dword. We find the adjacent index by toggling the low bit.
9023 int AdjIndex = InPlaceInputs[0] ^ 1;
9024 SourceHalfMask[AdjIndex - HalfOffset] = InPlaceInputs[1] - HalfOffset;
9025 std::replace(HalfMask.begin(), HalfMask.end(), InPlaceInputs[1], AdjIndex);
9026 PSHUFDMask[AdjIndex / 2] = AdjIndex / 2;
9028 fixInPlaceInputs(LToLInputs, HToLInputs, PSHUFLMask, LoMask, 0);
9029 fixInPlaceInputs(HToHInputs, LToHInputs, PSHUFHMask, HiMask, 4);
9031 // Now gather the cross-half inputs and place them into a free dword of
9032 // their target half.
9033 // FIXME: This operation could almost certainly be simplified dramatically to
9034 // look more like the 3-1 fixing operation.
9035 auto moveInputsToRightHalf = [&PSHUFDMask](
9036 MutableArrayRef<int> IncomingInputs, ArrayRef<int> ExistingInputs,
9037 MutableArrayRef<int> SourceHalfMask, MutableArrayRef<int> HalfMask,
9038 MutableArrayRef<int> FinalSourceHalfMask, int SourceOffset,
9040 auto isWordClobbered = [](ArrayRef<int> SourceHalfMask, int Word) {
9041 return SourceHalfMask[Word] != -1 && SourceHalfMask[Word] != Word;
9043 auto isDWordClobbered = [&isWordClobbered](ArrayRef<int> SourceHalfMask,
9045 int LowWord = Word & ~1;
9046 int HighWord = Word | 1;
9047 return isWordClobbered(SourceHalfMask, LowWord) ||
9048 isWordClobbered(SourceHalfMask, HighWord);
9051 if (IncomingInputs.empty())
9054 if (ExistingInputs.empty()) {
9055 // Map any dwords with inputs from them into the right half.
9056 for (int Input : IncomingInputs) {
9057 // If the source half mask maps over the inputs, turn those into
9058 // swaps and use the swapped lane.
9059 if (isWordClobbered(SourceHalfMask, Input - SourceOffset)) {
9060 if (SourceHalfMask[SourceHalfMask[Input - SourceOffset]] == -1) {
9061 SourceHalfMask[SourceHalfMask[Input - SourceOffset]] =
9062 Input - SourceOffset;
9063 // We have to swap the uses in our half mask in one sweep.
9064 for (int &M : HalfMask)
9065 if (M == SourceHalfMask[Input - SourceOffset] + SourceOffset)
9067 else if (M == Input)
9068 M = SourceHalfMask[Input - SourceOffset] + SourceOffset;
9070 assert(SourceHalfMask[SourceHalfMask[Input - SourceOffset]] ==
9071 Input - SourceOffset &&
9072 "Previous placement doesn't match!");
9074 // Note that this correctly re-maps both when we do a swap and when
9075 // we observe the other side of the swap above. We rely on that to
9076 // avoid swapping the members of the input list directly.
9077 Input = SourceHalfMask[Input - SourceOffset] + SourceOffset;
9080 // Map the input's dword into the correct half.
9081 if (PSHUFDMask[(Input - SourceOffset + DestOffset) / 2] == -1)
9082 PSHUFDMask[(Input - SourceOffset + DestOffset) / 2] = Input / 2;
9084 assert(PSHUFDMask[(Input - SourceOffset + DestOffset) / 2] ==
9086 "Previous placement doesn't match!");
9089 // And just directly shift any other-half mask elements to be same-half
9090 // as we will have mirrored the dword containing the element into the
9091 // same position within that half.
9092 for (int &M : HalfMask)
9093 if (M >= SourceOffset && M < SourceOffset + 4) {
9094 M = M - SourceOffset + DestOffset;
9095 assert(M >= 0 && "This should never wrap below zero!");
9100 // Ensure we have the input in a viable dword of its current half. This
9101 // is particularly tricky because the original position may be clobbered
9102 // by inputs being moved and *staying* in that half.
9103 if (IncomingInputs.size() == 1) {
9104 if (isWordClobbered(SourceHalfMask, IncomingInputs[0] - SourceOffset)) {
9105 int InputFixed = std::find(std::begin(SourceHalfMask),
9106 std::end(SourceHalfMask), -1) -
9107 std::begin(SourceHalfMask) + SourceOffset;
9108 SourceHalfMask[InputFixed - SourceOffset] =
9109 IncomingInputs[0] - SourceOffset;
9110 std::replace(HalfMask.begin(), HalfMask.end(), IncomingInputs[0],
9112 IncomingInputs[0] = InputFixed;
9114 } else if (IncomingInputs.size() == 2) {
9115 if (IncomingInputs[0] / 2 != IncomingInputs[1] / 2 ||
9116 isDWordClobbered(SourceHalfMask, IncomingInputs[0] - SourceOffset)) {
9117 // We have two non-adjacent or clobbered inputs we need to extract from
9118 // the source half. To do this, we need to map them into some adjacent
9119 // dword slot in the source mask.
9120 int InputsFixed[2] = {IncomingInputs[0] - SourceOffset,
9121 IncomingInputs[1] - SourceOffset};
9123 // If there is a free slot in the source half mask adjacent to one of
9124 // the inputs, place the other input in it. We use (Index XOR 1) to
9125 // compute an adjacent index.
9126 if (!isWordClobbered(SourceHalfMask, InputsFixed[0]) &&
9127 SourceHalfMask[InputsFixed[0] ^ 1] == -1) {
9128 SourceHalfMask[InputsFixed[0]] = InputsFixed[0];
9129 SourceHalfMask[InputsFixed[0] ^ 1] = InputsFixed[1];
9130 InputsFixed[1] = InputsFixed[0] ^ 1;
9131 } else if (!isWordClobbered(SourceHalfMask, InputsFixed[1]) &&
9132 SourceHalfMask[InputsFixed[1] ^ 1] == -1) {
9133 SourceHalfMask[InputsFixed[1]] = InputsFixed[1];
9134 SourceHalfMask[InputsFixed[1] ^ 1] = InputsFixed[0];
9135 InputsFixed[0] = InputsFixed[1] ^ 1;
9136 } else if (SourceHalfMask[2 * ((InputsFixed[0] / 2) ^ 1)] == -1 &&
9137 SourceHalfMask[2 * ((InputsFixed[0] / 2) ^ 1) + 1] == -1) {
9138 // The two inputs are in the same DWord but it is clobbered and the
9139 // adjacent DWord isn't used at all. Move both inputs to the free
9141 SourceHalfMask[2 * ((InputsFixed[0] / 2) ^ 1)] = InputsFixed[0];
9142 SourceHalfMask[2 * ((InputsFixed[0] / 2) ^ 1) + 1] = InputsFixed[1];
9143 InputsFixed[0] = 2 * ((InputsFixed[0] / 2) ^ 1);
9144 InputsFixed[1] = 2 * ((InputsFixed[0] / 2) ^ 1) + 1;
9146 // The only way we hit this point is if there is no clobbering
9147 // (because there are no off-half inputs to this half) and there is no
9148 // free slot adjacent to one of the inputs. In this case, we have to
9149 // swap an input with a non-input.
9150 for (int i = 0; i < 4; ++i)
9151 assert((SourceHalfMask[i] == -1 || SourceHalfMask[i] == i) &&
9152 "We can't handle any clobbers here!");
9153 assert(InputsFixed[1] != (InputsFixed[0] ^ 1) &&
9154 "Cannot have adjacent inputs here!");
9156 SourceHalfMask[InputsFixed[0] ^ 1] = InputsFixed[1];
9157 SourceHalfMask[InputsFixed[1]] = InputsFixed[0] ^ 1;
9159 // We also have to update the final source mask in this case because
9160 // it may need to undo the above swap.
9161 for (int &M : FinalSourceHalfMask)
9162 if (M == (InputsFixed[0] ^ 1) + SourceOffset)
9163 M = InputsFixed[1] + SourceOffset;
9164 else if (M == InputsFixed[1] + SourceOffset)
9165 M = (InputsFixed[0] ^ 1) + SourceOffset;
9167 InputsFixed[1] = InputsFixed[0] ^ 1;
9170 // Point everything at the fixed inputs.
9171 for (int &M : HalfMask)
9172 if (M == IncomingInputs[0])
9173 M = InputsFixed[0] + SourceOffset;
9174 else if (M == IncomingInputs[1])
9175 M = InputsFixed[1] + SourceOffset;
9177 IncomingInputs[0] = InputsFixed[0] + SourceOffset;
9178 IncomingInputs[1] = InputsFixed[1] + SourceOffset;
9181 llvm_unreachable("Unhandled input size!");
9184 // Now hoist the DWord down to the right half.
9185 int FreeDWord = (PSHUFDMask[DestOffset / 2] == -1 ? 0 : 1) + DestOffset / 2;
9186 assert(PSHUFDMask[FreeDWord] == -1 && "DWord not free");
9187 PSHUFDMask[FreeDWord] = IncomingInputs[0] / 2;
9188 for (int &M : HalfMask)
9189 for (int Input : IncomingInputs)
9191 M = FreeDWord * 2 + Input % 2;
9193 moveInputsToRightHalf(HToLInputs, LToLInputs, PSHUFHMask, LoMask, HiMask,
9194 /*SourceOffset*/ 4, /*DestOffset*/ 0);
9195 moveInputsToRightHalf(LToHInputs, HToHInputs, PSHUFLMask, HiMask, LoMask,
9196 /*SourceOffset*/ 0, /*DestOffset*/ 4);
9198 // Now enact all the shuffles we've computed to move the inputs into their
9200 if (!isNoopShuffleMask(PSHUFLMask))
9201 V = DAG.getNode(X86ISD::PSHUFLW, DL, VT, V,
9202 getV4X86ShuffleImm8ForMask(PSHUFLMask, DL, DAG));
9203 if (!isNoopShuffleMask(PSHUFHMask))
9204 V = DAG.getNode(X86ISD::PSHUFHW, DL, VT, V,
9205 getV4X86ShuffleImm8ForMask(PSHUFHMask, DL, DAG));
9206 if (!isNoopShuffleMask(PSHUFDMask))
9209 DAG.getNode(X86ISD::PSHUFD, DL, PSHUFDVT, DAG.getBitcast(PSHUFDVT, V),
9210 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG)));
9212 // At this point, each half should contain all its inputs, and we can then
9213 // just shuffle them into their final position.
9214 assert(std::count_if(LoMask.begin(), LoMask.end(),
9215 [](int M) { return M >= 4; }) == 0 &&
9216 "Failed to lift all the high half inputs to the low mask!");
9217 assert(std::count_if(HiMask.begin(), HiMask.end(),
9218 [](int M) { return M >= 0 && M < 4; }) == 0 &&
9219 "Failed to lift all the low half inputs to the high mask!");
9221 // Do a half shuffle for the low mask.
9222 if (!isNoopShuffleMask(LoMask))
9223 V = DAG.getNode(X86ISD::PSHUFLW, DL, VT, V,
9224 getV4X86ShuffleImm8ForMask(LoMask, DL, DAG));
9226 // Do a half shuffle with the high mask after shifting its values down.
9227 for (int &M : HiMask)
9230 if (!isNoopShuffleMask(HiMask))
9231 V = DAG.getNode(X86ISD::PSHUFHW, DL, VT, V,
9232 getV4X86ShuffleImm8ForMask(HiMask, DL, DAG));
9237 /// \brief Helper to form a PSHUFB-based shuffle+blend.
9238 static SDValue lowerVectorShuffleAsPSHUFB(SDLoc DL, MVT VT, SDValue V1,
9239 SDValue V2, ArrayRef<int> Mask,
9240 SelectionDAG &DAG, bool &V1InUse,
9242 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
9248 int Size = Mask.size();
9249 int Scale = 16 / Size;
9250 for (int i = 0; i < 16; ++i) {
9251 if (Mask[i / Scale] == -1) {
9252 V1Mask[i] = V2Mask[i] = DAG.getUNDEF(MVT::i8);
9254 const int ZeroMask = 0x80;
9255 int V1Idx = Mask[i / Scale] < Size ? Mask[i / Scale] * Scale + i % Scale
9257 int V2Idx = Mask[i / Scale] < Size
9259 : (Mask[i / Scale] - Size) * Scale + i % Scale;
9260 if (Zeroable[i / Scale])
9261 V1Idx = V2Idx = ZeroMask;
9262 V1Mask[i] = DAG.getConstant(V1Idx, DL, MVT::i8);
9263 V2Mask[i] = DAG.getConstant(V2Idx, DL, MVT::i8);
9264 V1InUse |= (ZeroMask != V1Idx);
9265 V2InUse |= (ZeroMask != V2Idx);
9270 V1 = DAG.getNode(X86ISD::PSHUFB, DL, MVT::v16i8,
9271 DAG.getBitcast(MVT::v16i8, V1),
9272 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v16i8, V1Mask));
9274 V2 = DAG.getNode(X86ISD::PSHUFB, DL, MVT::v16i8,
9275 DAG.getBitcast(MVT::v16i8, V2),
9276 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v16i8, V2Mask));
9278 // If we need shuffled inputs from both, blend the two.
9280 if (V1InUse && V2InUse)
9281 V = DAG.getNode(ISD::OR, DL, MVT::v16i8, V1, V2);
9283 V = V1InUse ? V1 : V2;
9285 // Cast the result back to the correct type.
9286 return DAG.getBitcast(VT, V);
9289 /// \brief Generic lowering of 8-lane i16 shuffles.
9291 /// This handles both single-input shuffles and combined shuffle/blends with
9292 /// two inputs. The single input shuffles are immediately delegated to
9293 /// a dedicated lowering routine.
9295 /// The blends are lowered in one of three fundamental ways. If there are few
9296 /// enough inputs, it delegates to a basic UNPCK-based strategy. If the shuffle
9297 /// of the input is significantly cheaper when lowered as an interleaving of
9298 /// the two inputs, try to interleave them. Otherwise, blend the low and high
9299 /// halves of the inputs separately (making them have relatively few inputs)
9300 /// and then concatenate them.
9301 static SDValue lowerV8I16VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
9302 const X86Subtarget *Subtarget,
9303 SelectionDAG &DAG) {
9305 assert(Op.getSimpleValueType() == MVT::v8i16 && "Bad shuffle type!");
9306 assert(V1.getSimpleValueType() == MVT::v8i16 && "Bad operand type!");
9307 assert(V2.getSimpleValueType() == MVT::v8i16 && "Bad operand type!");
9308 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
9309 ArrayRef<int> OrigMask = SVOp->getMask();
9310 int MaskStorage[8] = {OrigMask[0], OrigMask[1], OrigMask[2], OrigMask[3],
9311 OrigMask[4], OrigMask[5], OrigMask[6], OrigMask[7]};
9312 MutableArrayRef<int> Mask(MaskStorage);
9314 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
9316 // Whenever we can lower this as a zext, that instruction is strictly faster
9317 // than any alternative.
9318 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(
9319 DL, MVT::v8i16, V1, V2, OrigMask, Subtarget, DAG))
9322 auto isV1 = [](int M) { return M >= 0 && M < 8; };
9324 auto isV2 = [](int M) { return M >= 8; };
9326 int NumV2Inputs = std::count_if(Mask.begin(), Mask.end(), isV2);
9328 if (NumV2Inputs == 0) {
9329 // Check for being able to broadcast a single element.
9330 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v8i16, V1,
9331 Mask, Subtarget, DAG))
9334 // Try to use shift instructions.
9336 lowerVectorShuffleAsShift(DL, MVT::v8i16, V1, V1, Mask, DAG))
9339 // Use dedicated unpack instructions for masks that match their pattern.
9341 lowerVectorShuffleWithUNPCK(DL, MVT::v8i16, Mask, V1, V2, DAG))
9344 // Try to use byte rotation instructions.
9345 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(DL, MVT::v8i16, V1, V1,
9346 Mask, Subtarget, DAG))
9349 return lowerV8I16GeneralSingleInputVectorShuffle(DL, MVT::v8i16, V1, Mask,
9353 assert(std::any_of(Mask.begin(), Mask.end(), isV1) &&
9354 "All single-input shuffles should be canonicalized to be V1-input "
9357 // Try to use shift instructions.
9359 lowerVectorShuffleAsShift(DL, MVT::v8i16, V1, V2, Mask, DAG))
9362 // See if we can use SSE4A Extraction / Insertion.
9363 if (Subtarget->hasSSE4A())
9364 if (SDValue V = lowerVectorShuffleWithSSE4A(DL, MVT::v8i16, V1, V2, Mask, DAG))
9367 // There are special ways we can lower some single-element blends.
9368 if (NumV2Inputs == 1)
9369 if (SDValue V = lowerVectorShuffleAsElementInsertion(DL, MVT::v8i16, V1, V2,
9370 Mask, Subtarget, DAG))
9373 // We have different paths for blend lowering, but they all must use the
9374 // *exact* same predicate.
9375 bool IsBlendSupported = Subtarget->hasSSE41();
9376 if (IsBlendSupported)
9377 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v8i16, V1, V2, Mask,
9381 if (SDValue Masked =
9382 lowerVectorShuffleAsBitMask(DL, MVT::v8i16, V1, V2, Mask, DAG))
9385 // Use dedicated unpack instructions for masks that match their pattern.
9387 lowerVectorShuffleWithUNPCK(DL, MVT::v8i16, Mask, V1, V2, DAG))
9390 // Try to use byte rotation instructions.
9391 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
9392 DL, MVT::v8i16, V1, V2, Mask, Subtarget, DAG))
9395 if (SDValue BitBlend =
9396 lowerVectorShuffleAsBitBlend(DL, MVT::v8i16, V1, V2, Mask, DAG))
9399 if (SDValue Unpack = lowerVectorShuffleAsPermuteAndUnpack(DL, MVT::v8i16, V1,
9403 // If we can't directly blend but can use PSHUFB, that will be better as it
9404 // can both shuffle and set up the inefficient blend.
9405 if (!IsBlendSupported && Subtarget->hasSSSE3()) {
9406 bool V1InUse, V2InUse;
9407 return lowerVectorShuffleAsPSHUFB(DL, MVT::v8i16, V1, V2, Mask, DAG,
9411 // We can always bit-blend if we have to so the fallback strategy is to
9412 // decompose into single-input permutes and blends.
9413 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v8i16, V1, V2,
9417 /// \brief Check whether a compaction lowering can be done by dropping even
9418 /// elements and compute how many times even elements must be dropped.
9420 /// This handles shuffles which take every Nth element where N is a power of
9421 /// two. Example shuffle masks:
9423 /// N = 1: 0, 2, 4, 6, 8, 10, 12, 14, 0, 2, 4, 6, 8, 10, 12, 14
9424 /// N = 1: 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30
9425 /// N = 2: 0, 4, 8, 12, 0, 4, 8, 12, 0, 4, 8, 12, 0, 4, 8, 12
9426 /// N = 2: 0, 4, 8, 12, 16, 20, 24, 28, 0, 4, 8, 12, 16, 20, 24, 28
9427 /// N = 3: 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8
9428 /// N = 3: 0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24
9430 /// Any of these lanes can of course be undef.
9432 /// This routine only supports N <= 3.
9433 /// FIXME: Evaluate whether either AVX or AVX-512 have any opportunities here
9436 /// \returns N above, or the number of times even elements must be dropped if
9437 /// there is such a number. Otherwise returns zero.
9438 static int canLowerByDroppingEvenElements(ArrayRef<int> Mask) {
9439 // Figure out whether we're looping over two inputs or just one.
9440 bool IsSingleInput = isSingleInputShuffleMask(Mask);
9442 // The modulus for the shuffle vector entries is based on whether this is
9443 // a single input or not.
9444 int ShuffleModulus = Mask.size() * (IsSingleInput ? 1 : 2);
9445 assert(isPowerOf2_32((uint32_t)ShuffleModulus) &&
9446 "We should only be called with masks with a power-of-2 size!");
9448 uint64_t ModMask = (uint64_t)ShuffleModulus - 1;
9450 // We track whether the input is viable for all power-of-2 strides 2^1, 2^2,
9451 // and 2^3 simultaneously. This is because we may have ambiguity with
9452 // partially undef inputs.
9453 bool ViableForN[3] = {true, true, true};
9455 for (int i = 0, e = Mask.size(); i < e; ++i) {
9456 // Ignore undef lanes, we'll optimistically collapse them to the pattern we
9461 bool IsAnyViable = false;
9462 for (unsigned j = 0; j != array_lengthof(ViableForN); ++j)
9463 if (ViableForN[j]) {
9466 // The shuffle mask must be equal to (i * 2^N) % M.
9467 if ((uint64_t)Mask[i] == (((uint64_t)i << N) & ModMask))
9470 ViableForN[j] = false;
9472 // Early exit if we exhaust the possible powers of two.
9477 for (unsigned j = 0; j != array_lengthof(ViableForN); ++j)
9481 // Return 0 as there is no viable power of two.
9485 /// \brief Generic lowering of v16i8 shuffles.
9487 /// This is a hybrid strategy to lower v16i8 vectors. It first attempts to
9488 /// detect any complexity reducing interleaving. If that doesn't help, it uses
9489 /// UNPCK to spread the i8 elements across two i16-element vectors, and uses
9490 /// the existing lowering for v8i16 blends on each half, finally PACK-ing them
9492 static SDValue lowerV16I8VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
9493 const X86Subtarget *Subtarget,
9494 SelectionDAG &DAG) {
9496 assert(Op.getSimpleValueType() == MVT::v16i8 && "Bad shuffle type!");
9497 assert(V1.getSimpleValueType() == MVT::v16i8 && "Bad operand type!");
9498 assert(V2.getSimpleValueType() == MVT::v16i8 && "Bad operand type!");
9499 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
9500 ArrayRef<int> Mask = SVOp->getMask();
9501 assert(Mask.size() == 16 && "Unexpected mask size for v16 shuffle!");
9503 // Try to use shift instructions.
9505 lowerVectorShuffleAsShift(DL, MVT::v16i8, V1, V2, Mask, DAG))
9508 // Try to use byte rotation instructions.
9509 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
9510 DL, MVT::v16i8, V1, V2, Mask, Subtarget, DAG))
9513 // Try to use a zext lowering.
9514 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(
9515 DL, MVT::v16i8, V1, V2, Mask, Subtarget, DAG))
9518 // See if we can use SSE4A Extraction / Insertion.
9519 if (Subtarget->hasSSE4A())
9520 if (SDValue V = lowerVectorShuffleWithSSE4A(DL, MVT::v16i8, V1, V2, Mask, DAG))
9524 std::count_if(Mask.begin(), Mask.end(), [](int M) { return M >= 16; });
9526 // For single-input shuffles, there are some nicer lowering tricks we can use.
9527 if (NumV2Elements == 0) {
9528 // Check for being able to broadcast a single element.
9529 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v16i8, V1,
9530 Mask, Subtarget, DAG))
9533 // Check whether we can widen this to an i16 shuffle by duplicating bytes.
9534 // Notably, this handles splat and partial-splat shuffles more efficiently.
9535 // However, it only makes sense if the pre-duplication shuffle simplifies
9536 // things significantly. Currently, this means we need to be able to
9537 // express the pre-duplication shuffle as an i16 shuffle.
9539 // FIXME: We should check for other patterns which can be widened into an
9540 // i16 shuffle as well.
9541 auto canWidenViaDuplication = [](ArrayRef<int> Mask) {
9542 for (int i = 0; i < 16; i += 2)
9543 if (Mask[i] != -1 && Mask[i + 1] != -1 && Mask[i] != Mask[i + 1])
9548 auto tryToWidenViaDuplication = [&]() -> SDValue {
9549 if (!canWidenViaDuplication(Mask))
9551 SmallVector<int, 4> LoInputs;
9552 std::copy_if(Mask.begin(), Mask.end(), std::back_inserter(LoInputs),
9553 [](int M) { return M >= 0 && M < 8; });
9554 std::sort(LoInputs.begin(), LoInputs.end());
9555 LoInputs.erase(std::unique(LoInputs.begin(), LoInputs.end()),
9557 SmallVector<int, 4> HiInputs;
9558 std::copy_if(Mask.begin(), Mask.end(), std::back_inserter(HiInputs),
9559 [](int M) { return M >= 8; });
9560 std::sort(HiInputs.begin(), HiInputs.end());
9561 HiInputs.erase(std::unique(HiInputs.begin(), HiInputs.end()),
9564 bool TargetLo = LoInputs.size() >= HiInputs.size();
9565 ArrayRef<int> InPlaceInputs = TargetLo ? LoInputs : HiInputs;
9566 ArrayRef<int> MovingInputs = TargetLo ? HiInputs : LoInputs;
9568 int PreDupI16Shuffle[] = {-1, -1, -1, -1, -1, -1, -1, -1};
9569 SmallDenseMap<int, int, 8> LaneMap;
9570 for (int I : InPlaceInputs) {
9571 PreDupI16Shuffle[I/2] = I/2;
9574 int j = TargetLo ? 0 : 4, je = j + 4;
9575 for (int i = 0, ie = MovingInputs.size(); i < ie; ++i) {
9576 // Check if j is already a shuffle of this input. This happens when
9577 // there are two adjacent bytes after we move the low one.
9578 if (PreDupI16Shuffle[j] != MovingInputs[i] / 2) {
9579 // If we haven't yet mapped the input, search for a slot into which
9581 while (j < je && PreDupI16Shuffle[j] != -1)
9585 // We can't place the inputs into a single half with a simple i16 shuffle, so bail.
9588 // Map this input with the i16 shuffle.
9589 PreDupI16Shuffle[j] = MovingInputs[i] / 2;
9592 // Update the lane map based on the mapping we ended up with.
9593 LaneMap[MovingInputs[i]] = 2 * j + MovingInputs[i] % 2;
9595 V1 = DAG.getBitcast(
9597 DAG.getVectorShuffle(MVT::v8i16, DL, DAG.getBitcast(MVT::v8i16, V1),
9598 DAG.getUNDEF(MVT::v8i16), PreDupI16Shuffle));
9600 // Unpack the bytes to form the i16s that will be shuffled into place.
9601 V1 = DAG.getNode(TargetLo ? X86ISD::UNPCKL : X86ISD::UNPCKH, DL,
9602 MVT::v16i8, V1, V1);
9604 int PostDupI16Shuffle[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
9605 for (int i = 0; i < 16; ++i)
9606 if (Mask[i] != -1) {
9607 int MappedMask = LaneMap[Mask[i]] - (TargetLo ? 0 : 8);
9608 assert(MappedMask < 8 && "Invalid v8 shuffle mask!");
9609 if (PostDupI16Shuffle[i / 2] == -1)
9610 PostDupI16Shuffle[i / 2] = MappedMask;
9612 assert(PostDupI16Shuffle[i / 2] == MappedMask &&
9613 "Conflicting entrties in the original shuffle!");
9615 return DAG.getBitcast(
9617 DAG.getVectorShuffle(MVT::v8i16, DL, DAG.getBitcast(MVT::v8i16, V1),
9618 DAG.getUNDEF(MVT::v8i16), PostDupI16Shuffle));
9620 if (SDValue V = tryToWidenViaDuplication())
9624 if (SDValue Masked =
9625 lowerVectorShuffleAsBitMask(DL, MVT::v16i8, V1, V2, Mask, DAG))
9628 // Use dedicated unpack instructions for masks that match their pattern.
9630 lowerVectorShuffleWithUNPCK(DL, MVT::v16i8, Mask, V1, V2, DAG))
9633 // Check for SSSE3 which lets us lower all v16i8 shuffles much more directly
9634 // with PSHUFB. It is important to do this before we attempt to generate any
9635 // blends but after all of the single-input lowerings. If the single input
9636 // lowerings can find an instruction sequence that is faster than a PSHUFB, we
9637 // want to preserve that and we can DAG combine any longer sequences into
9638 // a PSHUFB in the end. But once we start blending from multiple inputs,
9639 // the complexity of DAG combining bad patterns back into PSHUFB is too high,
9640 // and there are *very* few patterns that would actually be faster than the
9641 // PSHUFB approach because of its ability to zero lanes.
9643 // FIXME: The only exceptions to the above are blends which are exact
9644 // interleavings with direct instructions supporting them. We currently don't
9645 // handle those well here.
9646 if (Subtarget->hasSSSE3()) {
9647 bool V1InUse = false;
9648 bool V2InUse = false;
9650 SDValue PSHUFB = lowerVectorShuffleAsPSHUFB(DL, MVT::v16i8, V1, V2, Mask,
9651 DAG, V1InUse, V2InUse);
9653 // If both V1 and V2 are in use and we can use a direct blend or an unpack,
9654 // do so. This avoids using them to handle blends-with-zero which is
9655 // important as a single pshufb is significantly faster for that.
9656 if (V1InUse && V2InUse) {
9657 if (Subtarget->hasSSE41())
9658 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v16i8, V1, V2,
9659 Mask, Subtarget, DAG))
9662 // We can use an unpack to do the blending rather than an or in some
9663 // cases. Even though the or may be (very minorly) more efficient, we
9664 // preference this lowering because there are common cases where part of
9665 // the complexity of the shuffles goes away when we do the final blend as
9667 // FIXME: It might be worth trying to detect if the unpack-feeding
9668 // shuffles will both be pshufb, in which case we shouldn't bother with
9670 if (SDValue Unpack = lowerVectorShuffleAsPermuteAndUnpack(
9671 DL, MVT::v16i8, V1, V2, Mask, DAG))
9678 // There are special ways we can lower some single-element blends.
9679 if (NumV2Elements == 1)
9680 if (SDValue V = lowerVectorShuffleAsElementInsertion(DL, MVT::v16i8, V1, V2,
9681 Mask, Subtarget, DAG))
9684 if (SDValue BitBlend =
9685 lowerVectorShuffleAsBitBlend(DL, MVT::v16i8, V1, V2, Mask, DAG))
9688 // Check whether a compaction lowering can be done. This handles shuffles
9689 // which take every Nth element for some even N. See the helper function for
9692 // We special case these as they can be particularly efficiently handled with
9693 // the PACKUSB instruction on x86 and they show up in common patterns of
9694 // rearranging bytes to truncate wide elements.
9695 if (int NumEvenDrops = canLowerByDroppingEvenElements(Mask)) {
9696 // NumEvenDrops is the power of two stride of the elements. Another way of
9697 // thinking about it is that we need to drop the even elements this many
9698 // times to get the original input.
9699 bool IsSingleInput = isSingleInputShuffleMask(Mask);
9701 // First we need to zero all the dropped bytes.
9702 assert(NumEvenDrops <= 3 &&
9703 "No support for dropping even elements more than 3 times.");
9704 // We use the mask type to pick which bytes are preserved based on how many
9705 // elements are dropped.
9706 MVT MaskVTs[] = { MVT::v8i16, MVT::v4i32, MVT::v2i64 };
9707 SDValue ByteClearMask = DAG.getBitcast(
9708 MVT::v16i8, DAG.getConstant(0xFF, DL, MaskVTs[NumEvenDrops - 1]));
9709 V1 = DAG.getNode(ISD::AND, DL, MVT::v16i8, V1, ByteClearMask);
9711 V2 = DAG.getNode(ISD::AND, DL, MVT::v16i8, V2, ByteClearMask);
9713 // Now pack things back together.
9714 V1 = DAG.getBitcast(MVT::v8i16, V1);
9715 V2 = IsSingleInput ? V1 : DAG.getBitcast(MVT::v8i16, V2);
9716 SDValue Result = DAG.getNode(X86ISD::PACKUS, DL, MVT::v16i8, V1, V2);
9717 for (int i = 1; i < NumEvenDrops; ++i) {
9718 Result = DAG.getBitcast(MVT::v8i16, Result);
9719 Result = DAG.getNode(X86ISD::PACKUS, DL, MVT::v16i8, Result, Result);
9725 // Handle multi-input cases by blending single-input shuffles.
9726 if (NumV2Elements > 0)
9727 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v16i8, V1, V2,
9730 // The fallback path for single-input shuffles widens this into two v8i16
9731 // vectors with unpacks, shuffles those, and then pulls them back together
9735 int LoBlendMask[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
9736 int HiBlendMask[8] = {-1, -1, -1, -1, -1, -1, -1, -1};
9737 for (int i = 0; i < 16; ++i)
9739 (i < 8 ? LoBlendMask[i] : HiBlendMask[i % 8]) = Mask[i];
9741 SDValue Zero = getZeroVector(MVT::v8i16, Subtarget, DAG, DL);
9743 SDValue VLoHalf, VHiHalf;
9744 // Check if any of the odd lanes in the v16i8 are used. If not, we can mask
9745 // them out and avoid using UNPCK{L,H} to extract the elements of V as
9747 if (std::none_of(std::begin(LoBlendMask), std::end(LoBlendMask),
9748 [](int M) { return M >= 0 && M % 2 == 1; }) &&
9749 std::none_of(std::begin(HiBlendMask), std::end(HiBlendMask),
9750 [](int M) { return M >= 0 && M % 2 == 1; })) {
9751 // Use a mask to drop the high bytes.
9752 VLoHalf = DAG.getBitcast(MVT::v8i16, V);
9753 VLoHalf = DAG.getNode(ISD::AND, DL, MVT::v8i16, VLoHalf,
9754 DAG.getConstant(0x00FF, DL, MVT::v8i16));
9756 // This will be a single vector shuffle instead of a blend so nuke VHiHalf.
9757 VHiHalf = DAG.getUNDEF(MVT::v8i16);
9759 // Squash the masks to point directly into VLoHalf.
9760 for (int &M : LoBlendMask)
9763 for (int &M : HiBlendMask)
9767 // Otherwise just unpack the low half of V into VLoHalf and the high half into
9768 // VHiHalf so that we can blend them as i16s.
9769 VLoHalf = DAG.getBitcast(
9770 MVT::v8i16, DAG.getNode(X86ISD::UNPCKL, DL, MVT::v16i8, V, Zero));
9771 VHiHalf = DAG.getBitcast(
9772 MVT::v8i16, DAG.getNode(X86ISD::UNPCKH, DL, MVT::v16i8, V, Zero));
9775 SDValue LoV = DAG.getVectorShuffle(MVT::v8i16, DL, VLoHalf, VHiHalf, LoBlendMask);
9776 SDValue HiV = DAG.getVectorShuffle(MVT::v8i16, DL, VLoHalf, VHiHalf, HiBlendMask);
9778 return DAG.getNode(X86ISD::PACKUS, DL, MVT::v16i8, LoV, HiV);
9781 /// \brief Dispatching routine to lower various 128-bit x86 vector shuffles.
9783 /// This routine breaks down the specific type of 128-bit shuffle and
9784 /// dispatches to the lowering routines accordingly.
9785 static SDValue lower128BitVectorShuffle(SDValue Op, SDValue V1, SDValue V2,
9786 MVT VT, const X86Subtarget *Subtarget,
9787 SelectionDAG &DAG) {
9788 switch (VT.SimpleTy) {
9790 return lowerV2I64VectorShuffle(Op, V1, V2, Subtarget, DAG);
9792 return lowerV2F64VectorShuffle(Op, V1, V2, Subtarget, DAG);
9794 return lowerV4I32VectorShuffle(Op, V1, V2, Subtarget, DAG);
9796 return lowerV4F32VectorShuffle(Op, V1, V2, Subtarget, DAG);
9798 return lowerV8I16VectorShuffle(Op, V1, V2, Subtarget, DAG);
9800 return lowerV16I8VectorShuffle(Op, V1, V2, Subtarget, DAG);
9803 llvm_unreachable("Unimplemented!");
9807 /// \brief Helper function to test whether a shuffle mask could be
9808 /// simplified by widening the elements being shuffled.
9810 /// Appends the mask for wider elements in WidenedMask if valid. Otherwise
9811 /// leaves it in an unspecified state.
9813 /// NOTE: This must handle normal vector shuffle masks and *target* vector
9814 /// shuffle masks. The latter have the special property of a '-2' representing
9815 /// a zero-ed lane of a vector.
9816 static bool canWidenShuffleElements(ArrayRef<int> Mask,
9817 SmallVectorImpl<int> &WidenedMask) {
9818 for (int i = 0, Size = Mask.size(); i < Size; i += 2) {
9819 // If both elements are undef, its trivial.
9820 if (Mask[i] == SM_SentinelUndef && Mask[i + 1] == SM_SentinelUndef) {
9821 WidenedMask.push_back(SM_SentinelUndef);
9825 // Check for an undef mask and a mask value properly aligned to fit with
9826 // a pair of values. If we find such a case, use the non-undef mask's value.
9827 if (Mask[i] == SM_SentinelUndef && Mask[i + 1] >= 0 && Mask[i + 1] % 2 == 1) {
9828 WidenedMask.push_back(Mask[i + 1] / 2);
9831 if (Mask[i + 1] == SM_SentinelUndef && Mask[i] >= 0 && Mask[i] % 2 == 0) {
9832 WidenedMask.push_back(Mask[i] / 2);
9836 // When zeroing, we need to spread the zeroing across both lanes to widen.
9837 if (Mask[i] == SM_SentinelZero || Mask[i + 1] == SM_SentinelZero) {
9838 if ((Mask[i] == SM_SentinelZero || Mask[i] == SM_SentinelUndef) &&
9839 (Mask[i + 1] == SM_SentinelZero || Mask[i + 1] == SM_SentinelUndef)) {
9840 WidenedMask.push_back(SM_SentinelZero);
9846 // Finally check if the two mask values are adjacent and aligned with
9848 if (Mask[i] != SM_SentinelUndef && Mask[i] % 2 == 0 && Mask[i] + 1 == Mask[i + 1]) {
9849 WidenedMask.push_back(Mask[i] / 2);
9853 // Otherwise we can't safely widen the elements used in this shuffle.
9856 assert(WidenedMask.size() == Mask.size() / 2 &&
9857 "Incorrect size of mask after widening the elements!");
9862 /// \brief Generic routine to split vector shuffle into half-sized shuffles.
9864 /// This routine just extracts two subvectors, shuffles them independently, and
9865 /// then concatenates them back together. This should work effectively with all
9866 /// AVX vector shuffle types.
9867 static SDValue splitAndLowerVectorShuffle(SDLoc DL, MVT VT, SDValue V1,
9868 SDValue V2, ArrayRef<int> Mask,
9869 SelectionDAG &DAG) {
9870 assert(VT.getSizeInBits() >= 256 &&
9871 "Only for 256-bit or wider vector shuffles!");
9872 assert(V1.getSimpleValueType() == VT && "Bad operand type!");
9873 assert(V2.getSimpleValueType() == VT && "Bad operand type!");
9875 ArrayRef<int> LoMask = Mask.slice(0, Mask.size() / 2);
9876 ArrayRef<int> HiMask = Mask.slice(Mask.size() / 2);
9878 int NumElements = VT.getVectorNumElements();
9879 int SplitNumElements = NumElements / 2;
9880 MVT ScalarVT = VT.getVectorElementType();
9881 MVT SplitVT = MVT::getVectorVT(ScalarVT, NumElements / 2);
9883 // Rather than splitting build-vectors, just build two narrower build
9884 // vectors. This helps shuffling with splats and zeros.
9885 auto SplitVector = [&](SDValue V) {
9886 while (V.getOpcode() == ISD::BITCAST)
9887 V = V->getOperand(0);
9889 MVT OrigVT = V.getSimpleValueType();
9890 int OrigNumElements = OrigVT.getVectorNumElements();
9891 int OrigSplitNumElements = OrigNumElements / 2;
9892 MVT OrigScalarVT = OrigVT.getVectorElementType();
9893 MVT OrigSplitVT = MVT::getVectorVT(OrigScalarVT, OrigNumElements / 2);
9897 auto *BV = dyn_cast<BuildVectorSDNode>(V);
9899 LoV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, OrigSplitVT, V,
9900 DAG.getIntPtrConstant(0, DL));
9901 HiV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, OrigSplitVT, V,
9902 DAG.getIntPtrConstant(OrigSplitNumElements, DL));
9905 SmallVector<SDValue, 16> LoOps, HiOps;
9906 for (int i = 0; i < OrigSplitNumElements; ++i) {
9907 LoOps.push_back(BV->getOperand(i));
9908 HiOps.push_back(BV->getOperand(i + OrigSplitNumElements));
9910 LoV = DAG.getNode(ISD::BUILD_VECTOR, DL, OrigSplitVT, LoOps);
9911 HiV = DAG.getNode(ISD::BUILD_VECTOR, DL, OrigSplitVT, HiOps);
9913 return std::make_pair(DAG.getBitcast(SplitVT, LoV),
9914 DAG.getBitcast(SplitVT, HiV));
9917 SDValue LoV1, HiV1, LoV2, HiV2;
9918 std::tie(LoV1, HiV1) = SplitVector(V1);
9919 std::tie(LoV2, HiV2) = SplitVector(V2);
9921 // Now create two 4-way blends of these half-width vectors.
9922 auto HalfBlend = [&](ArrayRef<int> HalfMask) {
9923 bool UseLoV1 = false, UseHiV1 = false, UseLoV2 = false, UseHiV2 = false;
9924 SmallVector<int, 32> V1BlendMask, V2BlendMask, BlendMask;
9925 for (int i = 0; i < SplitNumElements; ++i) {
9926 int M = HalfMask[i];
9927 if (M >= NumElements) {
9928 if (M >= NumElements + SplitNumElements)
9932 V2BlendMask.push_back(M - NumElements);
9933 V1BlendMask.push_back(-1);
9934 BlendMask.push_back(SplitNumElements + i);
9935 } else if (M >= 0) {
9936 if (M >= SplitNumElements)
9940 V2BlendMask.push_back(-1);
9941 V1BlendMask.push_back(M);
9942 BlendMask.push_back(i);
9944 V2BlendMask.push_back(-1);
9945 V1BlendMask.push_back(-1);
9946 BlendMask.push_back(-1);
9950 // Because the lowering happens after all combining takes place, we need to
9951 // manually combine these blend masks as much as possible so that we create
9952 // a minimal number of high-level vector shuffle nodes.
9954 // First try just blending the halves of V1 or V2.
9955 if (!UseLoV1 && !UseHiV1 && !UseLoV2 && !UseHiV2)
9956 return DAG.getUNDEF(SplitVT);
9957 if (!UseLoV2 && !UseHiV2)
9958 return DAG.getVectorShuffle(SplitVT, DL, LoV1, HiV1, V1BlendMask);
9959 if (!UseLoV1 && !UseHiV1)
9960 return DAG.getVectorShuffle(SplitVT, DL, LoV2, HiV2, V2BlendMask);
9962 SDValue V1Blend, V2Blend;
9963 if (UseLoV1 && UseHiV1) {
9965 DAG.getVectorShuffle(SplitVT, DL, LoV1, HiV1, V1BlendMask);
9967 // We only use half of V1 so map the usage down into the final blend mask.
9968 V1Blend = UseLoV1 ? LoV1 : HiV1;
9969 for (int i = 0; i < SplitNumElements; ++i)
9970 if (BlendMask[i] >= 0 && BlendMask[i] < SplitNumElements)
9971 BlendMask[i] = V1BlendMask[i] - (UseLoV1 ? 0 : SplitNumElements);
9973 if (UseLoV2 && UseHiV2) {
9975 DAG.getVectorShuffle(SplitVT, DL, LoV2, HiV2, V2BlendMask);
9977 // We only use half of V2 so map the usage down into the final blend mask.
9978 V2Blend = UseLoV2 ? LoV2 : HiV2;
9979 for (int i = 0; i < SplitNumElements; ++i)
9980 if (BlendMask[i] >= SplitNumElements)
9981 BlendMask[i] = V2BlendMask[i] + (UseLoV2 ? SplitNumElements : 0);
9983 return DAG.getVectorShuffle(SplitVT, DL, V1Blend, V2Blend, BlendMask);
9985 SDValue Lo = HalfBlend(LoMask);
9986 SDValue Hi = HalfBlend(HiMask);
9987 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, Lo, Hi);
9990 /// \brief Either split a vector in halves or decompose the shuffles and the
9993 /// This is provided as a good fallback for many lowerings of non-single-input
9994 /// shuffles with more than one 128-bit lane. In those cases, we want to select
9995 /// between splitting the shuffle into 128-bit components and stitching those
9996 /// back together vs. extracting the single-input shuffles and blending those
9998 static SDValue lowerVectorShuffleAsSplitOrBlend(SDLoc DL, MVT VT, SDValue V1,
9999 SDValue V2, ArrayRef<int> Mask,
10000 SelectionDAG &DAG) {
10001 assert(!isSingleInputShuffleMask(Mask) && "This routine must not be used to "
10002 "lower single-input shuffles as it "
10003 "could then recurse on itself.");
10004 int Size = Mask.size();
10006 // If this can be modeled as a broadcast of two elements followed by a blend,
10007 // prefer that lowering. This is especially important because broadcasts can
10008 // often fold with memory operands.
10009 auto DoBothBroadcast = [&] {
10010 int V1BroadcastIdx = -1, V2BroadcastIdx = -1;
10013 if (V2BroadcastIdx == -1)
10014 V2BroadcastIdx = M - Size;
10015 else if (M - Size != V2BroadcastIdx)
10017 } else if (M >= 0) {
10018 if (V1BroadcastIdx == -1)
10019 V1BroadcastIdx = M;
10020 else if (M != V1BroadcastIdx)
10025 if (DoBothBroadcast())
10026 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, VT, V1, V2, Mask,
10029 // If the inputs all stem from a single 128-bit lane of each input, then we
10030 // split them rather than blending because the split will decompose to
10031 // unusually few instructions.
10032 int LaneCount = VT.getSizeInBits() / 128;
10033 int LaneSize = Size / LaneCount;
10034 SmallBitVector LaneInputs[2];
10035 LaneInputs[0].resize(LaneCount, false);
10036 LaneInputs[1].resize(LaneCount, false);
10037 for (int i = 0; i < Size; ++i)
10039 LaneInputs[Mask[i] / Size][(Mask[i] % Size) / LaneSize] = true;
10040 if (LaneInputs[0].count() <= 1 && LaneInputs[1].count() <= 1)
10041 return splitAndLowerVectorShuffle(DL, VT, V1, V2, Mask, DAG);
10043 // Otherwise, just fall back to decomposed shuffles and a blend. This requires
10044 // that the decomposed single-input shuffles don't end up here.
10045 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, VT, V1, V2, Mask, DAG);
10048 /// \brief Lower a vector shuffle crossing multiple 128-bit lanes as
10049 /// a permutation and blend of those lanes.
10051 /// This essentially blends the out-of-lane inputs to each lane into the lane
10052 /// from a permuted copy of the vector. This lowering strategy results in four
10053 /// instructions in the worst case for a single-input cross lane shuffle which
10054 /// is lower than any other fully general cross-lane shuffle strategy I'm aware
10055 /// of. Special cases for each particular shuffle pattern should be handled
10056 /// prior to trying this lowering.
10057 static SDValue lowerVectorShuffleAsLanePermuteAndBlend(SDLoc DL, MVT VT,
10058 SDValue V1, SDValue V2,
10059 ArrayRef<int> Mask,
10060 SelectionDAG &DAG) {
10061 // FIXME: This should probably be generalized for 512-bit vectors as well.
10062 assert(VT.is256BitVector() && "Only for 256-bit vector shuffles!");
10063 int LaneSize = Mask.size() / 2;
10065 // If there are only inputs from one 128-bit lane, splitting will in fact be
10066 // less expensive. The flags track whether the given lane contains an element
10067 // that crosses to another lane.
10068 bool LaneCrossing[2] = {false, false};
10069 for (int i = 0, Size = Mask.size(); i < Size; ++i)
10070 if (Mask[i] >= 0 && (Mask[i] % Size) / LaneSize != i / LaneSize)
10071 LaneCrossing[(Mask[i] % Size) / LaneSize] = true;
10072 if (!LaneCrossing[0] || !LaneCrossing[1])
10073 return splitAndLowerVectorShuffle(DL, VT, V1, V2, Mask, DAG);
10075 if (isSingleInputShuffleMask(Mask)) {
10076 SmallVector<int, 32> FlippedBlendMask;
10077 for (int i = 0, Size = Mask.size(); i < Size; ++i)
10078 FlippedBlendMask.push_back(
10079 Mask[i] < 0 ? -1 : (((Mask[i] % Size) / LaneSize == i / LaneSize)
10081 : Mask[i] % LaneSize +
10082 (i / LaneSize) * LaneSize + Size));
10084 // Flip the vector, and blend the results which should now be in-lane. The
10085 // VPERM2X128 mask uses the low 2 bits for the low source and bits 4 and
10086 // 5 for the high source. The value 3 selects the high half of source 2 and
10087 // the value 2 selects the low half of source 2. We only use source 2 to
10088 // allow folding it into a memory operand.
10089 unsigned PERMMask = 3 | 2 << 4;
10090 SDValue Flipped = DAG.getNode(X86ISD::VPERM2X128, DL, VT, DAG.getUNDEF(VT),
10091 V1, DAG.getConstant(PERMMask, DL, MVT::i8));
10092 return DAG.getVectorShuffle(VT, DL, V1, Flipped, FlippedBlendMask);
10095 // This now reduces to two single-input shuffles of V1 and V2 which at worst
10096 // will be handled by the above logic and a blend of the results, much like
10097 // other patterns in AVX.
10098 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, VT, V1, V2, Mask, DAG);
10101 /// \brief Handle lowering 2-lane 128-bit shuffles.
10102 static SDValue lowerV2X128VectorShuffle(SDLoc DL, MVT VT, SDValue V1,
10103 SDValue V2, ArrayRef<int> Mask,
10104 const X86Subtarget *Subtarget,
10105 SelectionDAG &DAG) {
10106 // TODO: If minimizing size and one of the inputs is a zero vector and the
10107 // the zero vector has only one use, we could use a VPERM2X128 to save the
10108 // instruction bytes needed to explicitly generate the zero vector.
10110 // Blends are faster and handle all the non-lane-crossing cases.
10111 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, VT, V1, V2, Mask,
10115 bool IsV1Zero = ISD::isBuildVectorAllZeros(V1.getNode());
10116 bool IsV2Zero = ISD::isBuildVectorAllZeros(V2.getNode());
10118 // If either input operand is a zero vector, use VPERM2X128 because its mask
10119 // allows us to replace the zero input with an implicit zero.
10120 if (!IsV1Zero && !IsV2Zero) {
10121 // Check for patterns which can be matched with a single insert of a 128-bit
10123 bool OnlyUsesV1 = isShuffleEquivalent(V1, V2, Mask, {0, 1, 0, 1});
10124 if (OnlyUsesV1 || isShuffleEquivalent(V1, V2, Mask, {0, 1, 4, 5})) {
10125 MVT SubVT = MVT::getVectorVT(VT.getVectorElementType(),
10126 VT.getVectorNumElements() / 2);
10127 SDValue LoV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, SubVT, V1,
10128 DAG.getIntPtrConstant(0, DL));
10129 SDValue HiV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, SubVT,
10130 OnlyUsesV1 ? V1 : V2,
10131 DAG.getIntPtrConstant(0, DL));
10132 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, LoV, HiV);
10136 // Otherwise form a 128-bit permutation. After accounting for undefs,
10137 // convert the 64-bit shuffle mask selection values into 128-bit
10138 // selection bits by dividing the indexes by 2 and shifting into positions
10139 // defined by a vperm2*128 instruction's immediate control byte.
10141 // The immediate permute control byte looks like this:
10142 // [1:0] - select 128 bits from sources for low half of destination
10144 // [3] - zero low half of destination
10145 // [5:4] - select 128 bits from sources for high half of destination
10147 // [7] - zero high half of destination
10149 int MaskLO = Mask[0];
10150 if (MaskLO == SM_SentinelUndef)
10151 MaskLO = Mask[1] == SM_SentinelUndef ? 0 : Mask[1];
10153 int MaskHI = Mask[2];
10154 if (MaskHI == SM_SentinelUndef)
10155 MaskHI = Mask[3] == SM_SentinelUndef ? 0 : Mask[3];
10157 unsigned PermMask = MaskLO / 2 | (MaskHI / 2) << 4;
10159 // If either input is a zero vector, replace it with an undef input.
10160 // Shuffle mask values < 4 are selecting elements of V1.
10161 // Shuffle mask values >= 4 are selecting elements of V2.
10162 // Adjust each half of the permute mask by clearing the half that was
10163 // selecting the zero vector and setting the zero mask bit.
10165 V1 = DAG.getUNDEF(VT);
10167 PermMask = (PermMask & 0xf0) | 0x08;
10169 PermMask = (PermMask & 0x0f) | 0x80;
10172 V2 = DAG.getUNDEF(VT);
10174 PermMask = (PermMask & 0xf0) | 0x08;
10176 PermMask = (PermMask & 0x0f) | 0x80;
10179 return DAG.getNode(X86ISD::VPERM2X128, DL, VT, V1, V2,
10180 DAG.getConstant(PermMask, DL, MVT::i8));
10183 /// \brief Lower a vector shuffle by first fixing the 128-bit lanes and then
10184 /// shuffling each lane.
10186 /// This will only succeed when the result of fixing the 128-bit lanes results
10187 /// in a single-input non-lane-crossing shuffle with a repeating shuffle mask in
10188 /// each 128-bit lanes. This handles many cases where we can quickly blend away
10189 /// the lane crosses early and then use simpler shuffles within each lane.
10191 /// FIXME: It might be worthwhile at some point to support this without
10192 /// requiring the 128-bit lane-relative shuffles to be repeating, but currently
10193 /// in x86 only floating point has interesting non-repeating shuffles, and even
10194 /// those are still *marginally* more expensive.
10195 static SDValue lowerVectorShuffleByMerging128BitLanes(
10196 SDLoc DL, MVT VT, SDValue V1, SDValue V2, ArrayRef<int> Mask,
10197 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
10198 assert(!isSingleInputShuffleMask(Mask) &&
10199 "This is only useful with multiple inputs.");
10201 int Size = Mask.size();
10202 int LaneSize = 128 / VT.getScalarSizeInBits();
10203 int NumLanes = Size / LaneSize;
10204 assert(NumLanes > 1 && "Only handles 256-bit and wider shuffles.");
10206 // See if we can build a hypothetical 128-bit lane-fixing shuffle mask. Also
10207 // check whether the in-128-bit lane shuffles share a repeating pattern.
10208 SmallVector<int, 4> Lanes;
10209 Lanes.resize(NumLanes, -1);
10210 SmallVector<int, 4> InLaneMask;
10211 InLaneMask.resize(LaneSize, -1);
10212 for (int i = 0; i < Size; ++i) {
10216 int j = i / LaneSize;
10218 if (Lanes[j] < 0) {
10219 // First entry we've seen for this lane.
10220 Lanes[j] = Mask[i] / LaneSize;
10221 } else if (Lanes[j] != Mask[i] / LaneSize) {
10222 // This doesn't match the lane selected previously!
10226 // Check that within each lane we have a consistent shuffle mask.
10227 int k = i % LaneSize;
10228 if (InLaneMask[k] < 0) {
10229 InLaneMask[k] = Mask[i] % LaneSize;
10230 } else if (InLaneMask[k] != Mask[i] % LaneSize) {
10231 // This doesn't fit a repeating in-lane mask.
10236 // First shuffle the lanes into place.
10237 MVT LaneVT = MVT::getVectorVT(VT.isFloatingPoint() ? MVT::f64 : MVT::i64,
10238 VT.getSizeInBits() / 64);
10239 SmallVector<int, 8> LaneMask;
10240 LaneMask.resize(NumLanes * 2, -1);
10241 for (int i = 0; i < NumLanes; ++i)
10242 if (Lanes[i] >= 0) {
10243 LaneMask[2 * i + 0] = 2*Lanes[i] + 0;
10244 LaneMask[2 * i + 1] = 2*Lanes[i] + 1;
10247 V1 = DAG.getBitcast(LaneVT, V1);
10248 V2 = DAG.getBitcast(LaneVT, V2);
10249 SDValue LaneShuffle = DAG.getVectorShuffle(LaneVT, DL, V1, V2, LaneMask);
10251 // Cast it back to the type we actually want.
10252 LaneShuffle = DAG.getBitcast(VT, LaneShuffle);
10254 // Now do a simple shuffle that isn't lane crossing.
10255 SmallVector<int, 8> NewMask;
10256 NewMask.resize(Size, -1);
10257 for (int i = 0; i < Size; ++i)
10259 NewMask[i] = (i / LaneSize) * LaneSize + Mask[i] % LaneSize;
10260 assert(!is128BitLaneCrossingShuffleMask(VT, NewMask) &&
10261 "Must not introduce lane crosses at this point!");
10263 return DAG.getVectorShuffle(VT, DL, LaneShuffle, DAG.getUNDEF(VT), NewMask);
10266 /// \brief Test whether the specified input (0 or 1) is in-place blended by the
10269 /// This returns true if the elements from a particular input are already in the
10270 /// slot required by the given mask and require no permutation.
10271 static bool isShuffleMaskInputInPlace(int Input, ArrayRef<int> Mask) {
10272 assert((Input == 0 || Input == 1) && "Only two inputs to shuffles.");
10273 int Size = Mask.size();
10274 for (int i = 0; i < Size; ++i)
10275 if (Mask[i] >= 0 && Mask[i] / Size == Input && Mask[i] % Size != i)
10281 static SDValue lowerVectorShuffleWithSHUFPD(SDLoc DL, MVT VT,
10282 ArrayRef<int> Mask, SDValue V1,
10283 SDValue V2, SelectionDAG &DAG) {
10285 // Mask for V8F64: 0/1, 8/9, 2/3, 10/11, 4/5, ..
10286 // Mask for V4F64; 0/1, 4/5, 2/3, 6/7..
10287 assert(VT.getScalarSizeInBits() == 64 && "Unexpected data type for VSHUFPD");
10288 int NumElts = VT.getVectorNumElements();
10289 bool ShufpdMask = true;
10290 bool CommutableMask = true;
10291 unsigned Immediate = 0;
10292 for (int i = 0; i < NumElts; ++i) {
10295 int Val = (i & 6) + NumElts * (i & 1);
10296 int CommutVal = (i & 0xe) + NumElts * ((i & 1)^1);
10297 if (Mask[i] < Val || Mask[i] > Val + 1)
10298 ShufpdMask = false;
10299 if (Mask[i] < CommutVal || Mask[i] > CommutVal + 1)
10300 CommutableMask = false;
10301 Immediate |= (Mask[i] % 2) << i;
10304 return DAG.getNode(X86ISD::SHUFP, DL, VT, V1, V2,
10305 DAG.getConstant(Immediate, DL, MVT::i8));
10306 if (CommutableMask)
10307 return DAG.getNode(X86ISD::SHUFP, DL, VT, V2, V1,
10308 DAG.getConstant(Immediate, DL, MVT::i8));
10312 /// \brief Handle lowering of 4-lane 64-bit floating point shuffles.
10314 /// Also ends up handling lowering of 4-lane 64-bit integer shuffles when AVX2
10315 /// isn't available.
10316 static SDValue lowerV4F64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10317 const X86Subtarget *Subtarget,
10318 SelectionDAG &DAG) {
10320 assert(V1.getSimpleValueType() == MVT::v4f64 && "Bad operand type!");
10321 assert(V2.getSimpleValueType() == MVT::v4f64 && "Bad operand type!");
10322 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10323 ArrayRef<int> Mask = SVOp->getMask();
10324 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
10326 SmallVector<int, 4> WidenedMask;
10327 if (canWidenShuffleElements(Mask, WidenedMask))
10328 return lowerV2X128VectorShuffle(DL, MVT::v4f64, V1, V2, Mask, Subtarget,
10331 if (isSingleInputShuffleMask(Mask)) {
10332 // Check for being able to broadcast a single element.
10333 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v4f64, V1,
10334 Mask, Subtarget, DAG))
10337 // Use low duplicate instructions for masks that match their pattern.
10338 if (isShuffleEquivalent(V1, V2, Mask, {0, 0, 2, 2}))
10339 return DAG.getNode(X86ISD::MOVDDUP, DL, MVT::v4f64, V1);
10341 if (!is128BitLaneCrossingShuffleMask(MVT::v4f64, Mask)) {
10342 // Non-half-crossing single input shuffles can be lowerid with an
10343 // interleaved permutation.
10344 unsigned VPERMILPMask = (Mask[0] == 1) | ((Mask[1] == 1) << 1) |
10345 ((Mask[2] == 3) << 2) | ((Mask[3] == 3) << 3);
10346 return DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v4f64, V1,
10347 DAG.getConstant(VPERMILPMask, DL, MVT::i8));
10350 // With AVX2 we have direct support for this permutation.
10351 if (Subtarget->hasAVX2())
10352 return DAG.getNode(X86ISD::VPERMI, DL, MVT::v4f64, V1,
10353 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
10355 // Otherwise, fall back.
10356 return lowerVectorShuffleAsLanePermuteAndBlend(DL, MVT::v4f64, V1, V2, Mask,
10360 // Use dedicated unpack instructions for masks that match their pattern.
10362 lowerVectorShuffleWithUNPCK(DL, MVT::v4f64, Mask, V1, V2, DAG))
10365 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v4f64, V1, V2, Mask,
10369 // Check if the blend happens to exactly fit that of SHUFPD.
10371 lowerVectorShuffleWithSHUFPD(DL, MVT::v4f64, Mask, V1, V2, DAG))
10374 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10375 // shuffle. However, if we have AVX2 and either inputs are already in place,
10376 // we will be able to shuffle even across lanes the other input in a single
10377 // instruction so skip this pattern.
10378 if (!(Subtarget->hasAVX2() && (isShuffleMaskInputInPlace(0, Mask) ||
10379 isShuffleMaskInputInPlace(1, Mask))))
10380 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10381 DL, MVT::v4f64, V1, V2, Mask, Subtarget, DAG))
10384 // If we have AVX2 then we always want to lower with a blend because an v4 we
10385 // can fully permute the elements.
10386 if (Subtarget->hasAVX2())
10387 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v4f64, V1, V2,
10390 // Otherwise fall back on generic lowering.
10391 return lowerVectorShuffleAsSplitOrBlend(DL, MVT::v4f64, V1, V2, Mask, DAG);
10394 /// \brief Handle lowering of 4-lane 64-bit integer shuffles.
10396 /// This routine is only called when we have AVX2 and thus a reasonable
10397 /// instruction set for v4i64 shuffling..
10398 static SDValue lowerV4I64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10399 const X86Subtarget *Subtarget,
10400 SelectionDAG &DAG) {
10402 assert(V1.getSimpleValueType() == MVT::v4i64 && "Bad operand type!");
10403 assert(V2.getSimpleValueType() == MVT::v4i64 && "Bad operand type!");
10404 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10405 ArrayRef<int> Mask = SVOp->getMask();
10406 assert(Mask.size() == 4 && "Unexpected mask size for v4 shuffle!");
10407 assert(Subtarget->hasAVX2() && "We can only lower v4i64 with AVX2!");
10409 SmallVector<int, 4> WidenedMask;
10410 if (canWidenShuffleElements(Mask, WidenedMask))
10411 return lowerV2X128VectorShuffle(DL, MVT::v4i64, V1, V2, Mask, Subtarget,
10414 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v4i64, V1, V2, Mask,
10418 // Check for being able to broadcast a single element.
10419 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v4i64, V1,
10420 Mask, Subtarget, DAG))
10423 // When the shuffle is mirrored between the 128-bit lanes of the unit, we can
10424 // use lower latency instructions that will operate on both 128-bit lanes.
10425 SmallVector<int, 2> RepeatedMask;
10426 if (is128BitLaneRepeatedShuffleMask(MVT::v4i64, Mask, RepeatedMask)) {
10427 if (isSingleInputShuffleMask(Mask)) {
10428 int PSHUFDMask[] = {-1, -1, -1, -1};
10429 for (int i = 0; i < 2; ++i)
10430 if (RepeatedMask[i] >= 0) {
10431 PSHUFDMask[2 * i] = 2 * RepeatedMask[i];
10432 PSHUFDMask[2 * i + 1] = 2 * RepeatedMask[i] + 1;
10434 return DAG.getBitcast(
10436 DAG.getNode(X86ISD::PSHUFD, DL, MVT::v8i32,
10437 DAG.getBitcast(MVT::v8i32, V1),
10438 getV4X86ShuffleImm8ForMask(PSHUFDMask, DL, DAG)));
10442 // AVX2 provides a direct instruction for permuting a single input across
10444 if (isSingleInputShuffleMask(Mask))
10445 return DAG.getNode(X86ISD::VPERMI, DL, MVT::v4i64, V1,
10446 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
10448 // Try to use shift instructions.
10449 if (SDValue Shift =
10450 lowerVectorShuffleAsShift(DL, MVT::v4i64, V1, V2, Mask, DAG))
10453 // Use dedicated unpack instructions for masks that match their pattern.
10455 lowerVectorShuffleWithUNPCK(DL, MVT::v4i64, Mask, V1, V2, DAG))
10458 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10459 // shuffle. However, if we have AVX2 and either inputs are already in place,
10460 // we will be able to shuffle even across lanes the other input in a single
10461 // instruction so skip this pattern.
10462 if (!(Subtarget->hasAVX2() && (isShuffleMaskInputInPlace(0, Mask) ||
10463 isShuffleMaskInputInPlace(1, Mask))))
10464 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10465 DL, MVT::v4i64, V1, V2, Mask, Subtarget, DAG))
10468 // Otherwise fall back on generic blend lowering.
10469 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v4i64, V1, V2,
10473 /// \brief Handle lowering of 8-lane 32-bit floating point shuffles.
10475 /// Also ends up handling lowering of 8-lane 32-bit integer shuffles when AVX2
10476 /// isn't available.
10477 static SDValue lowerV8F32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10478 const X86Subtarget *Subtarget,
10479 SelectionDAG &DAG) {
10481 assert(V1.getSimpleValueType() == MVT::v8f32 && "Bad operand type!");
10482 assert(V2.getSimpleValueType() == MVT::v8f32 && "Bad operand type!");
10483 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10484 ArrayRef<int> Mask = SVOp->getMask();
10485 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
10487 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v8f32, V1, V2, Mask,
10491 // Check for being able to broadcast a single element.
10492 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v8f32, V1,
10493 Mask, Subtarget, DAG))
10496 // If the shuffle mask is repeated in each 128-bit lane, we have many more
10497 // options to efficiently lower the shuffle.
10498 SmallVector<int, 4> RepeatedMask;
10499 if (is128BitLaneRepeatedShuffleMask(MVT::v8f32, Mask, RepeatedMask)) {
10500 assert(RepeatedMask.size() == 4 &&
10501 "Repeated masks must be half the mask width!");
10503 // Use even/odd duplicate instructions for masks that match their pattern.
10504 if (isShuffleEquivalent(V1, V2, Mask, {0, 0, 2, 2, 4, 4, 6, 6}))
10505 return DAG.getNode(X86ISD::MOVSLDUP, DL, MVT::v8f32, V1);
10506 if (isShuffleEquivalent(V1, V2, Mask, {1, 1, 3, 3, 5, 5, 7, 7}))
10507 return DAG.getNode(X86ISD::MOVSHDUP, DL, MVT::v8f32, V1);
10509 if (isSingleInputShuffleMask(Mask))
10510 return DAG.getNode(X86ISD::VPERMILPI, DL, MVT::v8f32, V1,
10511 getV4X86ShuffleImm8ForMask(RepeatedMask, DL, DAG));
10513 // Use dedicated unpack instructions for masks that match their pattern.
10515 lowerVectorShuffleWithUNPCK(DL, MVT::v8f32, Mask, V1, V2, DAG))
10518 // Otherwise, fall back to a SHUFPS sequence. Here it is important that we
10519 // have already handled any direct blends. We also need to squash the
10520 // repeated mask into a simulated v4f32 mask.
10521 for (int i = 0; i < 4; ++i)
10522 if (RepeatedMask[i] >= 8)
10523 RepeatedMask[i] -= 4;
10524 return lowerVectorShuffleWithSHUFPS(DL, MVT::v8f32, RepeatedMask, V1, V2, DAG);
10527 // If we have a single input shuffle with different shuffle patterns in the
10528 // two 128-bit lanes use the variable mask to VPERMILPS.
10529 if (isSingleInputShuffleMask(Mask)) {
10530 SDValue VPermMask[8];
10531 for (int i = 0; i < 8; ++i)
10532 VPermMask[i] = Mask[i] < 0 ? DAG.getUNDEF(MVT::i32)
10533 : DAG.getConstant(Mask[i], DL, MVT::i32);
10534 if (!is128BitLaneCrossingShuffleMask(MVT::v8f32, Mask))
10535 return DAG.getNode(
10536 X86ISD::VPERMILPV, DL, MVT::v8f32, V1,
10537 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v8i32, VPermMask));
10539 if (Subtarget->hasAVX2())
10540 return DAG.getNode(
10541 X86ISD::VPERMV, DL, MVT::v8f32,
10542 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v8i32, VPermMask), V1);
10544 // Otherwise, fall back.
10545 return lowerVectorShuffleAsLanePermuteAndBlend(DL, MVT::v8f32, V1, V2, Mask,
10549 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10551 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10552 DL, MVT::v8f32, V1, V2, Mask, Subtarget, DAG))
10555 // If we have AVX2 then we always want to lower with a blend because at v8 we
10556 // can fully permute the elements.
10557 if (Subtarget->hasAVX2())
10558 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v8f32, V1, V2,
10561 // Otherwise fall back on generic lowering.
10562 return lowerVectorShuffleAsSplitOrBlend(DL, MVT::v8f32, V1, V2, Mask, DAG);
10565 /// \brief Handle lowering of 8-lane 32-bit integer shuffles.
10567 /// This routine is only called when we have AVX2 and thus a reasonable
10568 /// instruction set for v8i32 shuffling..
10569 static SDValue lowerV8I32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10570 const X86Subtarget *Subtarget,
10571 SelectionDAG &DAG) {
10573 assert(V1.getSimpleValueType() == MVT::v8i32 && "Bad operand type!");
10574 assert(V2.getSimpleValueType() == MVT::v8i32 && "Bad operand type!");
10575 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10576 ArrayRef<int> Mask = SVOp->getMask();
10577 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
10578 assert(Subtarget->hasAVX2() && "We can only lower v8i32 with AVX2!");
10580 // Whenever we can lower this as a zext, that instruction is strictly faster
10581 // than any alternative. It also allows us to fold memory operands into the
10582 // shuffle in many cases.
10583 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(DL, MVT::v8i32, V1, V2,
10584 Mask, Subtarget, DAG))
10587 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v8i32, V1, V2, Mask,
10591 // Check for being able to broadcast a single element.
10592 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v8i32, V1,
10593 Mask, Subtarget, DAG))
10596 // If the shuffle mask is repeated in each 128-bit lane we can use more
10597 // efficient instructions that mirror the shuffles across the two 128-bit
10599 SmallVector<int, 4> RepeatedMask;
10600 if (is128BitLaneRepeatedShuffleMask(MVT::v8i32, Mask, RepeatedMask)) {
10601 assert(RepeatedMask.size() == 4 && "Unexpected repeated mask size!");
10602 if (isSingleInputShuffleMask(Mask))
10603 return DAG.getNode(X86ISD::PSHUFD, DL, MVT::v8i32, V1,
10604 getV4X86ShuffleImm8ForMask(RepeatedMask, DL, DAG));
10606 // Use dedicated unpack instructions for masks that match their pattern.
10608 lowerVectorShuffleWithUNPCK(DL, MVT::v8i32, Mask, V1, V2, DAG))
10612 // Try to use shift instructions.
10613 if (SDValue Shift =
10614 lowerVectorShuffleAsShift(DL, MVT::v8i32, V1, V2, Mask, DAG))
10617 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
10618 DL, MVT::v8i32, V1, V2, Mask, Subtarget, DAG))
10621 // If the shuffle patterns aren't repeated but it is a single input, directly
10622 // generate a cross-lane VPERMD instruction.
10623 if (isSingleInputShuffleMask(Mask)) {
10624 SDValue VPermMask[8];
10625 for (int i = 0; i < 8; ++i)
10626 VPermMask[i] = Mask[i] < 0 ? DAG.getUNDEF(MVT::i32)
10627 : DAG.getConstant(Mask[i], DL, MVT::i32);
10628 return DAG.getNode(
10629 X86ISD::VPERMV, DL, MVT::v8i32,
10630 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v8i32, VPermMask), V1);
10633 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10635 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10636 DL, MVT::v8i32, V1, V2, Mask, Subtarget, DAG))
10639 // Otherwise fall back on generic blend lowering.
10640 return lowerVectorShuffleAsDecomposedShuffleBlend(DL, MVT::v8i32, V1, V2,
10644 /// \brief Handle lowering of 16-lane 16-bit integer shuffles.
10646 /// This routine is only called when we have AVX2 and thus a reasonable
10647 /// instruction set for v16i16 shuffling..
10648 static SDValue lowerV16I16VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10649 const X86Subtarget *Subtarget,
10650 SelectionDAG &DAG) {
10652 assert(V1.getSimpleValueType() == MVT::v16i16 && "Bad operand type!");
10653 assert(V2.getSimpleValueType() == MVT::v16i16 && "Bad operand type!");
10654 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10655 ArrayRef<int> Mask = SVOp->getMask();
10656 assert(Mask.size() == 16 && "Unexpected mask size for v16 shuffle!");
10657 assert(Subtarget->hasAVX2() && "We can only lower v16i16 with AVX2!");
10659 // Whenever we can lower this as a zext, that instruction is strictly faster
10660 // than any alternative. It also allows us to fold memory operands into the
10661 // shuffle in many cases.
10662 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(DL, MVT::v16i16, V1, V2,
10663 Mask, Subtarget, DAG))
10666 // Check for being able to broadcast a single element.
10667 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v16i16, V1,
10668 Mask, Subtarget, DAG))
10671 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v16i16, V1, V2, Mask,
10675 // Use dedicated unpack instructions for masks that match their pattern.
10677 lowerVectorShuffleWithUNPCK(DL, MVT::v16i16, Mask, V1, V2, DAG))
10680 // Try to use shift instructions.
10681 if (SDValue Shift =
10682 lowerVectorShuffleAsShift(DL, MVT::v16i16, V1, V2, Mask, DAG))
10685 // Try to use byte rotation instructions.
10686 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
10687 DL, MVT::v16i16, V1, V2, Mask, Subtarget, DAG))
10690 if (isSingleInputShuffleMask(Mask)) {
10691 // There are no generalized cross-lane shuffle operations available on i16
10693 if (is128BitLaneCrossingShuffleMask(MVT::v16i16, Mask))
10694 return lowerVectorShuffleAsLanePermuteAndBlend(DL, MVT::v16i16, V1, V2,
10697 SmallVector<int, 8> RepeatedMask;
10698 if (is128BitLaneRepeatedShuffleMask(MVT::v16i16, Mask, RepeatedMask)) {
10699 // As this is a single-input shuffle, the repeated mask should be
10700 // a strictly valid v8i16 mask that we can pass through to the v8i16
10701 // lowering to handle even the v16 case.
10702 return lowerV8I16GeneralSingleInputVectorShuffle(
10703 DL, MVT::v16i16, V1, RepeatedMask, Subtarget, DAG);
10706 SDValue PSHUFBMask[32];
10707 for (int i = 0; i < 16; ++i) {
10708 if (Mask[i] == -1) {
10709 PSHUFBMask[2 * i] = PSHUFBMask[2 * i + 1] = DAG.getUNDEF(MVT::i8);
10713 int M = i < 8 ? Mask[i] : Mask[i] - 8;
10714 assert(M >= 0 && M < 8 && "Invalid single-input mask!");
10715 PSHUFBMask[2 * i] = DAG.getConstant(2 * M, DL, MVT::i8);
10716 PSHUFBMask[2 * i + 1] = DAG.getConstant(2 * M + 1, DL, MVT::i8);
10718 return DAG.getBitcast(MVT::v16i16,
10719 DAG.getNode(X86ISD::PSHUFB, DL, MVT::v32i8,
10720 DAG.getBitcast(MVT::v32i8, V1),
10721 DAG.getNode(ISD::BUILD_VECTOR, DL,
10722 MVT::v32i8, PSHUFBMask)));
10725 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10727 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10728 DL, MVT::v16i16, V1, V2, Mask, Subtarget, DAG))
10731 // Otherwise fall back on generic lowering.
10732 return lowerVectorShuffleAsSplitOrBlend(DL, MVT::v16i16, V1, V2, Mask, DAG);
10735 /// \brief Handle lowering of 32-lane 8-bit integer shuffles.
10737 /// This routine is only called when we have AVX2 and thus a reasonable
10738 /// instruction set for v32i8 shuffling..
10739 static SDValue lowerV32I8VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10740 const X86Subtarget *Subtarget,
10741 SelectionDAG &DAG) {
10743 assert(V1.getSimpleValueType() == MVT::v32i8 && "Bad operand type!");
10744 assert(V2.getSimpleValueType() == MVT::v32i8 && "Bad operand type!");
10745 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10746 ArrayRef<int> Mask = SVOp->getMask();
10747 assert(Mask.size() == 32 && "Unexpected mask size for v32 shuffle!");
10748 assert(Subtarget->hasAVX2() && "We can only lower v32i8 with AVX2!");
10750 // Whenever we can lower this as a zext, that instruction is strictly faster
10751 // than any alternative. It also allows us to fold memory operands into the
10752 // shuffle in many cases.
10753 if (SDValue ZExt = lowerVectorShuffleAsZeroOrAnyExtend(DL, MVT::v32i8, V1, V2,
10754 Mask, Subtarget, DAG))
10757 // Check for being able to broadcast a single element.
10758 if (SDValue Broadcast = lowerVectorShuffleAsBroadcast(DL, MVT::v32i8, V1,
10759 Mask, Subtarget, DAG))
10762 if (SDValue Blend = lowerVectorShuffleAsBlend(DL, MVT::v32i8, V1, V2, Mask,
10766 // Use dedicated unpack instructions for masks that match their pattern.
10768 lowerVectorShuffleWithUNPCK(DL, MVT::v32i8, Mask, V1, V2, DAG))
10771 // Try to use shift instructions.
10772 if (SDValue Shift =
10773 lowerVectorShuffleAsShift(DL, MVT::v32i8, V1, V2, Mask, DAG))
10776 // Try to use byte rotation instructions.
10777 if (SDValue Rotate = lowerVectorShuffleAsByteRotate(
10778 DL, MVT::v32i8, V1, V2, Mask, Subtarget, DAG))
10781 if (isSingleInputShuffleMask(Mask)) {
10782 // There are no generalized cross-lane shuffle operations available on i8
10784 if (is128BitLaneCrossingShuffleMask(MVT::v32i8, Mask))
10785 return lowerVectorShuffleAsLanePermuteAndBlend(DL, MVT::v32i8, V1, V2,
10788 SDValue PSHUFBMask[32];
10789 for (int i = 0; i < 32; ++i)
10792 ? DAG.getUNDEF(MVT::i8)
10793 : DAG.getConstant(Mask[i] < 16 ? Mask[i] : Mask[i] - 16, DL,
10796 return DAG.getNode(
10797 X86ISD::PSHUFB, DL, MVT::v32i8, V1,
10798 DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v32i8, PSHUFBMask));
10801 // Try to simplify this by merging 128-bit lanes to enable a lane-based
10803 if (SDValue Result = lowerVectorShuffleByMerging128BitLanes(
10804 DL, MVT::v32i8, V1, V2, Mask, Subtarget, DAG))
10807 // Otherwise fall back on generic lowering.
10808 return lowerVectorShuffleAsSplitOrBlend(DL, MVT::v32i8, V1, V2, Mask, DAG);
10811 /// \brief High-level routine to lower various 256-bit x86 vector shuffles.
10813 /// This routine either breaks down the specific type of a 256-bit x86 vector
10814 /// shuffle or splits it into two 128-bit shuffles and fuses the results back
10815 /// together based on the available instructions.
10816 static SDValue lower256BitVectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10817 MVT VT, const X86Subtarget *Subtarget,
10818 SelectionDAG &DAG) {
10820 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10821 ArrayRef<int> Mask = SVOp->getMask();
10823 // If we have a single input to the zero element, insert that into V1 if we
10824 // can do so cheaply.
10825 int NumElts = VT.getVectorNumElements();
10826 int NumV2Elements = std::count_if(Mask.begin(), Mask.end(), [NumElts](int M) {
10827 return M >= NumElts;
10830 if (NumV2Elements == 1 && Mask[0] >= NumElts)
10831 if (SDValue Insertion = lowerVectorShuffleAsElementInsertion(
10832 DL, VT, V1, V2, Mask, Subtarget, DAG))
10835 // There is a really nice hard cut-over between AVX1 and AVX2 that means we
10836 // can check for those subtargets here and avoid much of the subtarget
10837 // querying in the per-vector-type lowering routines. With AVX1 we have
10838 // essentially *zero* ability to manipulate a 256-bit vector with integer
10839 // types. Since we'll use floating point types there eventually, just
10840 // immediately cast everything to a float and operate entirely in that domain.
10841 if (VT.isInteger() && !Subtarget->hasAVX2()) {
10842 int ElementBits = VT.getScalarSizeInBits();
10843 if (ElementBits < 32)
10844 // No floating point type available, decompose into 128-bit vectors.
10845 return splitAndLowerVectorShuffle(DL, VT, V1, V2, Mask, DAG);
10847 MVT FpVT = MVT::getVectorVT(MVT::getFloatingPointVT(ElementBits),
10848 VT.getVectorNumElements());
10849 V1 = DAG.getBitcast(FpVT, V1);
10850 V2 = DAG.getBitcast(FpVT, V2);
10851 return DAG.getBitcast(VT, DAG.getVectorShuffle(FpVT, DL, V1, V2, Mask));
10854 switch (VT.SimpleTy) {
10856 return lowerV4F64VectorShuffle(Op, V1, V2, Subtarget, DAG);
10858 return lowerV4I64VectorShuffle(Op, V1, V2, Subtarget, DAG);
10860 return lowerV8F32VectorShuffle(Op, V1, V2, Subtarget, DAG);
10862 return lowerV8I32VectorShuffle(Op, V1, V2, Subtarget, DAG);
10864 return lowerV16I16VectorShuffle(Op, V1, V2, Subtarget, DAG);
10866 return lowerV32I8VectorShuffle(Op, V1, V2, Subtarget, DAG);
10869 llvm_unreachable("Not a valid 256-bit x86 vector type!");
10873 /// \brief Try to lower a vector shuffle as a 128-bit shuffles.
10874 static SDValue lowerV4X128VectorShuffle(SDLoc DL, MVT VT,
10875 ArrayRef<int> Mask,
10876 SDValue V1, SDValue V2,
10877 SelectionDAG &DAG) {
10878 assert(VT.getScalarSizeInBits() == 64 &&
10879 "Unexpected element type size for 128bit shuffle.");
10881 // To handle 256 bit vector requires VLX and most probably
10882 // function lowerV2X128VectorShuffle() is better solution.
10883 assert(VT.is512BitVector() && "Unexpected vector size for 128bit shuffle.");
10885 SmallVector<int, 4> WidenedMask;
10886 if (!canWidenShuffleElements(Mask, WidenedMask))
10889 // Form a 128-bit permutation.
10890 // Convert the 64-bit shuffle mask selection values into 128-bit selection
10891 // bits defined by a vshuf64x2 instruction's immediate control byte.
10892 unsigned PermMask = 0, Imm = 0;
10893 unsigned ControlBitsNum = WidenedMask.size() / 2;
10895 for (int i = 0, Size = WidenedMask.size(); i < Size; ++i) {
10896 if (WidenedMask[i] == SM_SentinelZero)
10899 // Use first element in place of undef mask.
10900 Imm = (WidenedMask[i] == SM_SentinelUndef) ? 0 : WidenedMask[i];
10901 PermMask |= (Imm % WidenedMask.size()) << (i * ControlBitsNum);
10904 return DAG.getNode(X86ISD::SHUF128, DL, VT, V1, V2,
10905 DAG.getConstant(PermMask, DL, MVT::i8));
10908 static SDValue lowerVectorShuffleWithPERMV(SDLoc DL, MVT VT,
10909 ArrayRef<int> Mask, SDValue V1,
10910 SDValue V2, SelectionDAG &DAG) {
10912 assert(VT.getScalarSizeInBits() >= 16 && "Unexpected data type for PERMV");
10914 MVT MaskEltVT = MVT::getIntegerVT(VT.getScalarSizeInBits());
10915 MVT MaskVecVT = MVT::getVectorVT(MaskEltVT, VT.getVectorNumElements());
10917 SDValue MaskNode = getConstVector(Mask, MaskVecVT, DAG, DL, true);
10918 if (isSingleInputShuffleMask(Mask))
10919 return DAG.getNode(X86ISD::VPERMV, DL, VT, MaskNode, V1);
10921 return DAG.getNode(X86ISD::VPERMV3, DL, VT, V1, MaskNode, V2);
10924 /// \brief Handle lowering of 8-lane 64-bit floating point shuffles.
10925 static SDValue lowerV8F64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10926 const X86Subtarget *Subtarget,
10927 SelectionDAG &DAG) {
10929 assert(V1.getSimpleValueType() == MVT::v8f64 && "Bad operand type!");
10930 assert(V2.getSimpleValueType() == MVT::v8f64 && "Bad operand type!");
10931 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10932 ArrayRef<int> Mask = SVOp->getMask();
10933 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
10935 if (SDValue Shuf128 =
10936 lowerV4X128VectorShuffle(DL, MVT::v8f64, Mask, V1, V2, DAG))
10939 if (SDValue Unpck =
10940 lowerVectorShuffleWithUNPCK(DL, MVT::v8f64, Mask, V1, V2, DAG))
10943 return lowerVectorShuffleWithPERMV(DL, MVT::v8f64, Mask, V1, V2, DAG);
10946 /// \brief Handle lowering of 16-lane 32-bit floating point shuffles.
10947 static SDValue lowerV16F32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10948 const X86Subtarget *Subtarget,
10949 SelectionDAG &DAG) {
10951 assert(V1.getSimpleValueType() == MVT::v16f32 && "Bad operand type!");
10952 assert(V2.getSimpleValueType() == MVT::v16f32 && "Bad operand type!");
10953 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10954 ArrayRef<int> Mask = SVOp->getMask();
10955 assert(Mask.size() == 16 && "Unexpected mask size for v16 shuffle!");
10957 if (SDValue Unpck =
10958 lowerVectorShuffleWithUNPCK(DL, MVT::v16f32, Mask, V1, V2, DAG))
10961 return lowerVectorShuffleWithPERMV(DL, MVT::v16f32, Mask, V1, V2, DAG);
10964 /// \brief Handle lowering of 8-lane 64-bit integer shuffles.
10965 static SDValue lowerV8I64VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10966 const X86Subtarget *Subtarget,
10967 SelectionDAG &DAG) {
10969 assert(V1.getSimpleValueType() == MVT::v8i64 && "Bad operand type!");
10970 assert(V2.getSimpleValueType() == MVT::v8i64 && "Bad operand type!");
10971 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10972 ArrayRef<int> Mask = SVOp->getMask();
10973 assert(Mask.size() == 8 && "Unexpected mask size for v8 shuffle!");
10975 if (SDValue Shuf128 =
10976 lowerV4X128VectorShuffle(DL, MVT::v8i64, Mask, V1, V2, DAG))
10979 if (SDValue Unpck =
10980 lowerVectorShuffleWithUNPCK(DL, MVT::v8i64, Mask, V1, V2, DAG))
10983 return lowerVectorShuffleWithPERMV(DL, MVT::v8i64, Mask, V1, V2, DAG);
10986 /// \brief Handle lowering of 16-lane 32-bit integer shuffles.
10987 static SDValue lowerV16I32VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
10988 const X86Subtarget *Subtarget,
10989 SelectionDAG &DAG) {
10991 assert(V1.getSimpleValueType() == MVT::v16i32 && "Bad operand type!");
10992 assert(V2.getSimpleValueType() == MVT::v16i32 && "Bad operand type!");
10993 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
10994 ArrayRef<int> Mask = SVOp->getMask();
10995 assert(Mask.size() == 16 && "Unexpected mask size for v16 shuffle!");
10997 if (SDValue Unpck =
10998 lowerVectorShuffleWithUNPCK(DL, MVT::v16i32, Mask, V1, V2, DAG))
11001 return lowerVectorShuffleWithPERMV(DL, MVT::v16i32, Mask, V1, V2, DAG);
11004 /// \brief Handle lowering of 32-lane 16-bit integer shuffles.
11005 static SDValue lowerV32I16VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
11006 const X86Subtarget *Subtarget,
11007 SelectionDAG &DAG) {
11009 assert(V1.getSimpleValueType() == MVT::v32i16 && "Bad operand type!");
11010 assert(V2.getSimpleValueType() == MVT::v32i16 && "Bad operand type!");
11011 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
11012 ArrayRef<int> Mask = SVOp->getMask();
11013 assert(Mask.size() == 32 && "Unexpected mask size for v32 shuffle!");
11014 assert(Subtarget->hasBWI() && "We can only lower v32i16 with AVX-512-BWI!");
11016 return lowerVectorShuffleWithPERMV(DL, MVT::v32i16, Mask, V1, V2, DAG);
11019 /// \brief Handle lowering of 64-lane 8-bit integer shuffles.
11020 static SDValue lowerV64I8VectorShuffle(SDValue Op, SDValue V1, SDValue V2,
11021 const X86Subtarget *Subtarget,
11022 SelectionDAG &DAG) {
11024 assert(V1.getSimpleValueType() == MVT::v64i8 && "Bad operand type!");
11025 assert(V2.getSimpleValueType() == MVT::v64i8 && "Bad operand type!");
11026 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
11027 ArrayRef<int> Mask = SVOp->getMask();
11028 assert(Mask.size() == 64 && "Unexpected mask size for v64 shuffle!");
11029 assert(Subtarget->hasBWI() && "We can only lower v64i8 with AVX-512-BWI!");
11031 // FIXME: Implement direct support for this type!
11032 return splitAndLowerVectorShuffle(DL, MVT::v64i8, V1, V2, Mask, DAG);
11035 /// \brief High-level routine to lower various 512-bit x86 vector shuffles.
11037 /// This routine either breaks down the specific type of a 512-bit x86 vector
11038 /// shuffle or splits it into two 256-bit shuffles and fuses the results back
11039 /// together based on the available instructions.
11040 static SDValue lower512BitVectorShuffle(SDValue Op, SDValue V1, SDValue V2,
11041 MVT VT, const X86Subtarget *Subtarget,
11042 SelectionDAG &DAG) {
11044 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
11045 ArrayRef<int> Mask = SVOp->getMask();
11046 assert(Subtarget->hasAVX512() &&
11047 "Cannot lower 512-bit vectors w/ basic ISA!");
11049 // Check for being able to broadcast a single element.
11050 if (SDValue Broadcast =
11051 lowerVectorShuffleAsBroadcast(DL, VT, V1, Mask, Subtarget, DAG))
11054 // Dispatch to each element type for lowering. If we don't have supprot for
11055 // specific element type shuffles at 512 bits, immediately split them and
11056 // lower them. Each lowering routine of a given type is allowed to assume that
11057 // the requisite ISA extensions for that element type are available.
11058 switch (VT.SimpleTy) {
11060 return lowerV8F64VectorShuffle(Op, V1, V2, Subtarget, DAG);
11062 return lowerV16F32VectorShuffle(Op, V1, V2, Subtarget, DAG);
11064 return lowerV8I64VectorShuffle(Op, V1, V2, Subtarget, DAG);
11066 return lowerV16I32VectorShuffle(Op, V1, V2, Subtarget, DAG);
11068 if (Subtarget->hasBWI())
11069 return lowerV32I16VectorShuffle(Op, V1, V2, Subtarget, DAG);
11072 if (Subtarget->hasBWI())
11073 return lowerV64I8VectorShuffle(Op, V1, V2, Subtarget, DAG);
11077 llvm_unreachable("Not a valid 512-bit x86 vector type!");
11080 // Otherwise fall back on splitting.
11081 return splitAndLowerVectorShuffle(DL, VT, V1, V2, Mask, DAG);
11084 // Lower vXi1 vector shuffles.
11085 // There is no a dedicated instruction on AVX-512 that shuffles the masks.
11086 // The only way to shuffle bits is to sign-extend the mask vector to SIMD
11087 // vector, shuffle and then truncate it back.
11088 static SDValue lower1BitVectorShuffle(SDValue Op, SDValue V1, SDValue V2,
11089 MVT VT, const X86Subtarget *Subtarget,
11090 SelectionDAG &DAG) {
11092 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
11093 ArrayRef<int> Mask = SVOp->getMask();
11094 assert(Subtarget->hasAVX512() &&
11095 "Cannot lower 512-bit vectors w/o basic ISA!");
11097 switch (VT.SimpleTy) {
11099 llvm_unreachable("Expected a vector of i1 elements");
11101 ExtVT = MVT::v2i64;
11104 ExtVT = MVT::v4i32;
11107 ExtVT = MVT::v8i64; // Take 512-bit type, more shuffles on KNL
11110 ExtVT = MVT::v16i32;
11113 ExtVT = MVT::v32i16;
11116 ExtVT = MVT::v64i8;
11120 if (ISD::isBuildVectorAllZeros(V1.getNode()))
11121 V1 = getZeroVector(ExtVT, Subtarget, DAG, DL);
11122 else if (ISD::isBuildVectorAllOnes(V1.getNode()))
11123 V1 = getOnesVector(ExtVT, Subtarget, DAG, DL);
11125 V1 = DAG.getNode(ISD::SIGN_EXTEND, DL, ExtVT, V1);
11128 V2 = DAG.getUNDEF(ExtVT);
11129 else if (ISD::isBuildVectorAllZeros(V2.getNode()))
11130 V2 = getZeroVector(ExtVT, Subtarget, DAG, DL);
11131 else if (ISD::isBuildVectorAllOnes(V2.getNode()))
11132 V2 = getOnesVector(ExtVT, Subtarget, DAG, DL);
11134 V2 = DAG.getNode(ISD::SIGN_EXTEND, DL, ExtVT, V2);
11135 return DAG.getNode(ISD::TRUNCATE, DL, VT,
11136 DAG.getVectorShuffle(ExtVT, DL, V1, V2, Mask));
11138 /// \brief Top-level lowering for x86 vector shuffles.
11140 /// This handles decomposition, canonicalization, and lowering of all x86
11141 /// vector shuffles. Most of the specific lowering strategies are encapsulated
11142 /// above in helper routines. The canonicalization attempts to widen shuffles
11143 /// to involve fewer lanes of wider elements, consolidate symmetric patterns
11144 /// s.t. only one of the two inputs needs to be tested, etc.
11145 static SDValue lowerVectorShuffle(SDValue Op, const X86Subtarget *Subtarget,
11146 SelectionDAG &DAG) {
11147 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
11148 ArrayRef<int> Mask = SVOp->getMask();
11149 SDValue V1 = Op.getOperand(0);
11150 SDValue V2 = Op.getOperand(1);
11151 MVT VT = Op.getSimpleValueType();
11152 int NumElements = VT.getVectorNumElements();
11154 bool Is1BitVector = (VT.getVectorElementType() == MVT::i1);
11156 assert((VT.getSizeInBits() != 64 || Is1BitVector) &&
11157 "Can't lower MMX shuffles");
11159 bool V1IsUndef = V1.getOpcode() == ISD::UNDEF;
11160 bool V2IsUndef = V2.getOpcode() == ISD::UNDEF;
11161 if (V1IsUndef && V2IsUndef)
11162 return DAG.getUNDEF(VT);
11164 // When we create a shuffle node we put the UNDEF node to second operand,
11165 // but in some cases the first operand may be transformed to UNDEF.
11166 // In this case we should just commute the node.
11168 return DAG.getCommutedVectorShuffle(*SVOp);
11170 // Check for non-undef masks pointing at an undef vector and make the masks
11171 // undef as well. This makes it easier to match the shuffle based solely on
11175 if (M >= NumElements) {
11176 SmallVector<int, 8> NewMask(Mask.begin(), Mask.end());
11177 for (int &M : NewMask)
11178 if (M >= NumElements)
11180 return DAG.getVectorShuffle(VT, dl, V1, V2, NewMask);
11183 // We actually see shuffles that are entirely re-arrangements of a set of
11184 // zero inputs. This mostly happens while decomposing complex shuffles into
11185 // simple ones. Directly lower these as a buildvector of zeros.
11186 SmallBitVector Zeroable = computeZeroableShuffleElements(Mask, V1, V2);
11187 if (Zeroable.all())
11188 return getZeroVector(VT, Subtarget, DAG, dl);
11190 // Try to collapse shuffles into using a vector type with fewer elements but
11191 // wider element types. We cap this to not form integers or floating point
11192 // elements wider than 64 bits, but it might be interesting to form i128
11193 // integers to handle flipping the low and high halves of AVX 256-bit vectors.
11194 SmallVector<int, 16> WidenedMask;
11195 if (VT.getScalarSizeInBits() < 64 && !Is1BitVector &&
11196 canWidenShuffleElements(Mask, WidenedMask)) {
11197 MVT NewEltVT = VT.isFloatingPoint()
11198 ? MVT::getFloatingPointVT(VT.getScalarSizeInBits() * 2)
11199 : MVT::getIntegerVT(VT.getScalarSizeInBits() * 2);
11200 MVT NewVT = MVT::getVectorVT(NewEltVT, VT.getVectorNumElements() / 2);
11201 // Make sure that the new vector type is legal. For example, v2f64 isn't
11203 if (DAG.getTargetLoweringInfo().isTypeLegal(NewVT)) {
11204 V1 = DAG.getBitcast(NewVT, V1);
11205 V2 = DAG.getBitcast(NewVT, V2);
11206 return DAG.getBitcast(
11207 VT, DAG.getVectorShuffle(NewVT, dl, V1, V2, WidenedMask));
11211 int NumV1Elements = 0, NumUndefElements = 0, NumV2Elements = 0;
11212 for (int M : SVOp->getMask())
11214 ++NumUndefElements;
11215 else if (M < NumElements)
11220 // Commute the shuffle as needed such that more elements come from V1 than
11221 // V2. This allows us to match the shuffle pattern strictly on how many
11222 // elements come from V1 without handling the symmetric cases.
11223 if (NumV2Elements > NumV1Elements)
11224 return DAG.getCommutedVectorShuffle(*SVOp);
11226 // When the number of V1 and V2 elements are the same, try to minimize the
11227 // number of uses of V2 in the low half of the vector. When that is tied,
11228 // ensure that the sum of indices for V1 is equal to or lower than the sum
11229 // indices for V2. When those are equal, try to ensure that the number of odd
11230 // indices for V1 is lower than the number of odd indices for V2.
11231 if (NumV1Elements == NumV2Elements) {
11232 int LowV1Elements = 0, LowV2Elements = 0;
11233 for (int M : SVOp->getMask().slice(0, NumElements / 2))
11234 if (M >= NumElements)
11238 if (LowV2Elements > LowV1Elements) {
11239 return DAG.getCommutedVectorShuffle(*SVOp);
11240 } else if (LowV2Elements == LowV1Elements) {
11241 int SumV1Indices = 0, SumV2Indices = 0;
11242 for (int i = 0, Size = SVOp->getMask().size(); i < Size; ++i)
11243 if (SVOp->getMask()[i] >= NumElements)
11245 else if (SVOp->getMask()[i] >= 0)
11247 if (SumV2Indices < SumV1Indices) {
11248 return DAG.getCommutedVectorShuffle(*SVOp);
11249 } else if (SumV2Indices == SumV1Indices) {
11250 int NumV1OddIndices = 0, NumV2OddIndices = 0;
11251 for (int i = 0, Size = SVOp->getMask().size(); i < Size; ++i)
11252 if (SVOp->getMask()[i] >= NumElements)
11253 NumV2OddIndices += i % 2;
11254 else if (SVOp->getMask()[i] >= 0)
11255 NumV1OddIndices += i % 2;
11256 if (NumV2OddIndices < NumV1OddIndices)
11257 return DAG.getCommutedVectorShuffle(*SVOp);
11262 // For each vector width, delegate to a specialized lowering routine.
11263 if (VT.is128BitVector())
11264 return lower128BitVectorShuffle(Op, V1, V2, VT, Subtarget, DAG);
11266 if (VT.is256BitVector())
11267 return lower256BitVectorShuffle(Op, V1, V2, VT, Subtarget, DAG);
11269 if (VT.is512BitVector())
11270 return lower512BitVectorShuffle(Op, V1, V2, VT, Subtarget, DAG);
11273 return lower1BitVectorShuffle(Op, V1, V2, VT, Subtarget, DAG);
11274 llvm_unreachable("Unimplemented!");
11277 // This function assumes its argument is a BUILD_VECTOR of constants or
11278 // undef SDNodes. i.e: ISD::isBuildVectorOfConstantSDNodes(BuildVector) is
11280 static bool BUILD_VECTORtoBlendMask(BuildVectorSDNode *BuildVector,
11281 unsigned &MaskValue) {
11283 unsigned NumElems = BuildVector->getNumOperands();
11285 // There are 2 lanes if (NumElems > 8), and 1 lane otherwise.
11286 // We don't handle the >2 lanes case right now.
11287 unsigned NumLanes = (NumElems - 1) / 8 + 1;
11291 unsigned NumElemsInLane = NumElems / NumLanes;
11293 // Blend for v16i16 should be symmetric for the both lanes.
11294 for (unsigned i = 0; i < NumElemsInLane; ++i) {
11295 SDValue EltCond = BuildVector->getOperand(i);
11296 SDValue SndLaneEltCond =
11297 (NumLanes == 2) ? BuildVector->getOperand(i + NumElemsInLane) : EltCond;
11299 int Lane1Cond = -1, Lane2Cond = -1;
11300 if (isa<ConstantSDNode>(EltCond))
11301 Lane1Cond = !isNullConstant(EltCond);
11302 if (isa<ConstantSDNode>(SndLaneEltCond))
11303 Lane2Cond = !isNullConstant(SndLaneEltCond);
11305 unsigned LaneMask = 0;
11306 if (Lane1Cond == Lane2Cond || Lane2Cond < 0)
11307 // Lane1Cond != 0, means we want the first argument.
11308 // Lane1Cond == 0, means we want the second argument.
11309 // The encoding of this argument is 0 for the first argument, 1
11310 // for the second. Therefore, invert the condition.
11311 LaneMask = !Lane1Cond << i;
11312 else if (Lane1Cond < 0)
11313 LaneMask = !Lane2Cond << i;
11317 MaskValue |= LaneMask;
11319 MaskValue |= LaneMask << NumElemsInLane;
11324 /// \brief Try to lower a VSELECT instruction to a vector shuffle.
11325 static SDValue lowerVSELECTtoVectorShuffle(SDValue Op,
11326 const X86Subtarget *Subtarget,
11327 SelectionDAG &DAG) {
11328 SDValue Cond = Op.getOperand(0);
11329 SDValue LHS = Op.getOperand(1);
11330 SDValue RHS = Op.getOperand(2);
11332 MVT VT = Op.getSimpleValueType();
11334 if (!ISD::isBuildVectorOfConstantSDNodes(Cond.getNode()))
11336 auto *CondBV = cast<BuildVectorSDNode>(Cond);
11338 // Only non-legal VSELECTs reach this lowering, convert those into generic
11339 // shuffles and re-use the shuffle lowering path for blends.
11340 SmallVector<int, 32> Mask;
11341 for (int i = 0, Size = VT.getVectorNumElements(); i < Size; ++i) {
11342 SDValue CondElt = CondBV->getOperand(i);
11344 isa<ConstantSDNode>(CondElt) ? i + (isNullConstant(CondElt) ? Size : 0)
11347 return DAG.getVectorShuffle(VT, dl, LHS, RHS, Mask);
11350 SDValue X86TargetLowering::LowerVSELECT(SDValue Op, SelectionDAG &DAG) const {
11351 // A vselect where all conditions and data are constants can be optimized into
11352 // a single vector load by SelectionDAGLegalize::ExpandBUILD_VECTOR().
11353 if (ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(0).getNode()) &&
11354 ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(1).getNode()) &&
11355 ISD::isBuildVectorOfConstantSDNodes(Op.getOperand(2).getNode()))
11358 // Try to lower this to a blend-style vector shuffle. This can handle all
11359 // constant condition cases.
11360 if (SDValue BlendOp = lowerVSELECTtoVectorShuffle(Op, Subtarget, DAG))
11363 // Variable blends are only legal from SSE4.1 onward.
11364 if (!Subtarget->hasSSE41())
11367 // Only some types will be legal on some subtargets. If we can emit a legal
11368 // VSELECT-matching blend, return Op, and but if we need to expand, return
11370 switch (Op.getSimpleValueType().SimpleTy) {
11372 // Most of the vector types have blends past SSE4.1.
11376 // The byte blends for AVX vectors were introduced only in AVX2.
11377 if (Subtarget->hasAVX2())
11384 // AVX-512 BWI and VLX features support VSELECT with i16 elements.
11385 if (Subtarget->hasBWI() && Subtarget->hasVLX())
11388 // FIXME: We should custom lower this by fixing the condition and using i8
11394 static SDValue LowerEXTRACT_VECTOR_ELT_SSE4(SDValue Op, SelectionDAG &DAG) {
11395 MVT VT = Op.getSimpleValueType();
11398 if (!Op.getOperand(0).getSimpleValueType().is128BitVector())
11401 if (VT.getSizeInBits() == 8) {
11402 SDValue Extract = DAG.getNode(X86ISD::PEXTRB, dl, MVT::i32,
11403 Op.getOperand(0), Op.getOperand(1));
11404 SDValue Assert = DAG.getNode(ISD::AssertZext, dl, MVT::i32, Extract,
11405 DAG.getValueType(VT));
11406 return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
11409 if (VT.getSizeInBits() == 16) {
11410 // If Idx is 0, it's cheaper to do a move instead of a pextrw.
11411 if (isNullConstant(Op.getOperand(1)))
11412 return DAG.getNode(
11413 ISD::TRUNCATE, dl, MVT::i16,
11414 DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
11415 DAG.getBitcast(MVT::v4i32, Op.getOperand(0)),
11416 Op.getOperand(1)));
11417 SDValue Extract = DAG.getNode(X86ISD::PEXTRW, dl, MVT::i32,
11418 Op.getOperand(0), Op.getOperand(1));
11419 SDValue Assert = DAG.getNode(ISD::AssertZext, dl, MVT::i32, Extract,
11420 DAG.getValueType(VT));
11421 return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
11424 if (VT == MVT::f32) {
11425 // EXTRACTPS outputs to a GPR32 register which will require a movd to copy
11426 // the result back to FR32 register. It's only worth matching if the
11427 // result has a single use which is a store or a bitcast to i32. And in
11428 // the case of a store, it's not worth it if the index is a constant 0,
11429 // because a MOVSSmr can be used instead, which is smaller and faster.
11430 if (!Op.hasOneUse())
11432 SDNode *User = *Op.getNode()->use_begin();
11433 if ((User->getOpcode() != ISD::STORE ||
11434 isNullConstant(Op.getOperand(1))) &&
11435 (User->getOpcode() != ISD::BITCAST ||
11436 User->getValueType(0) != MVT::i32))
11438 SDValue Extract = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
11439 DAG.getBitcast(MVT::v4i32, Op.getOperand(0)),
11441 return DAG.getBitcast(MVT::f32, Extract);
11444 if (VT == MVT::i32 || VT == MVT::i64) {
11445 // ExtractPS/pextrq works with constant index.
11446 if (isa<ConstantSDNode>(Op.getOperand(1)))
11452 /// Extract one bit from mask vector, like v16i1 or v8i1.
11453 /// AVX-512 feature.
11455 X86TargetLowering::ExtractBitFromMaskVector(SDValue Op, SelectionDAG &DAG) const {
11456 SDValue Vec = Op.getOperand(0);
11458 MVT VecVT = Vec.getSimpleValueType();
11459 SDValue Idx = Op.getOperand(1);
11460 MVT EltVT = Op.getSimpleValueType();
11462 assert((EltVT == MVT::i1) && "Unexpected operands in ExtractBitFromMaskVector");
11463 assert((VecVT.getVectorNumElements() <= 16 || Subtarget->hasBWI()) &&
11464 "Unexpected vector type in ExtractBitFromMaskVector");
11466 // variable index can't be handled in mask registers,
11467 // extend vector to VR512
11468 if (!isa<ConstantSDNode>(Idx)) {
11469 MVT ExtVT = (VecVT == MVT::v8i1 ? MVT::v8i64 : MVT::v16i32);
11470 SDValue Ext = DAG.getNode(ISD::ZERO_EXTEND, dl, ExtVT, Vec);
11471 SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
11472 ExtVT.getVectorElementType(), Ext, Idx);
11473 return DAG.getNode(ISD::TRUNCATE, dl, EltVT, Elt);
11476 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11477 const TargetRegisterClass* rc = getRegClassFor(VecVT);
11478 if (!Subtarget->hasDQI() && (VecVT.getVectorNumElements() <= 8))
11479 rc = getRegClassFor(MVT::v16i1);
11480 unsigned MaxSift = rc->getSize()*8 - 1;
11481 Vec = DAG.getNode(X86ISD::VSHLI, dl, VecVT, Vec,
11482 DAG.getConstant(MaxSift - IdxVal, dl, MVT::i8));
11483 Vec = DAG.getNode(X86ISD::VSRLI, dl, VecVT, Vec,
11484 DAG.getConstant(MaxSift, dl, MVT::i8));
11485 return DAG.getNode(X86ISD::VEXTRACT, dl, MVT::i1, Vec,
11486 DAG.getIntPtrConstant(0, dl));
11490 X86TargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
11491 SelectionDAG &DAG) const {
11493 SDValue Vec = Op.getOperand(0);
11494 MVT VecVT = Vec.getSimpleValueType();
11495 SDValue Idx = Op.getOperand(1);
11497 if (Op.getSimpleValueType() == MVT::i1)
11498 return ExtractBitFromMaskVector(Op, DAG);
11500 if (!isa<ConstantSDNode>(Idx)) {
11501 if (VecVT.is512BitVector() ||
11502 (VecVT.is256BitVector() && Subtarget->hasInt256() &&
11503 VecVT.getVectorElementType().getSizeInBits() == 32)) {
11506 MVT::getIntegerVT(VecVT.getVectorElementType().getSizeInBits());
11507 MVT MaskVT = MVT::getVectorVT(MaskEltVT, VecVT.getSizeInBits() /
11508 MaskEltVT.getSizeInBits());
11510 Idx = DAG.getZExtOrTrunc(Idx, dl, MaskEltVT);
11511 auto PtrVT = getPointerTy(DAG.getDataLayout());
11512 SDValue Mask = DAG.getNode(X86ISD::VINSERT, dl, MaskVT,
11513 getZeroVector(MaskVT, Subtarget, DAG, dl), Idx,
11514 DAG.getConstant(0, dl, PtrVT));
11515 SDValue Perm = DAG.getNode(X86ISD::VPERMV, dl, VecVT, Mask, Vec);
11516 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, Op.getValueType(), Perm,
11517 DAG.getConstant(0, dl, PtrVT));
11522 // If this is a 256-bit vector result, first extract the 128-bit vector and
11523 // then extract the element from the 128-bit vector.
11524 if (VecVT.is256BitVector() || VecVT.is512BitVector()) {
11526 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11527 // Get the 128-bit vector.
11528 Vec = Extract128BitVector(Vec, IdxVal, DAG, dl);
11529 MVT EltVT = VecVT.getVectorElementType();
11531 unsigned ElemsPerChunk = 128 / EltVT.getSizeInBits();
11532 assert(isPowerOf2_32(ElemsPerChunk) && "Elements per chunk not power of 2");
11534 // Find IdxVal modulo ElemsPerChunk. Since ElemsPerChunk is a power of 2
11535 // this can be done with a mask.
11536 IdxVal &= ElemsPerChunk - 1;
11537 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, Op.getValueType(), Vec,
11538 DAG.getConstant(IdxVal, dl, MVT::i32));
11541 assert(VecVT.is128BitVector() && "Unexpected vector length");
11543 if (Subtarget->hasSSE41())
11544 if (SDValue Res = LowerEXTRACT_VECTOR_ELT_SSE4(Op, DAG))
11547 MVT VT = Op.getSimpleValueType();
11548 // TODO: handle v16i8.
11549 if (VT.getSizeInBits() == 16) {
11550 SDValue Vec = Op.getOperand(0);
11551 if (isNullConstant(Op.getOperand(1)))
11552 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i16,
11553 DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i32,
11554 DAG.getBitcast(MVT::v4i32, Vec),
11555 Op.getOperand(1)));
11556 // Transform it so it match pextrw which produces a 32-bit result.
11557 MVT EltVT = MVT::i32;
11558 SDValue Extract = DAG.getNode(X86ISD::PEXTRW, dl, EltVT,
11559 Op.getOperand(0), Op.getOperand(1));
11560 SDValue Assert = DAG.getNode(ISD::AssertZext, dl, EltVT, Extract,
11561 DAG.getValueType(VT));
11562 return DAG.getNode(ISD::TRUNCATE, dl, VT, Assert);
11565 if (VT.getSizeInBits() == 32) {
11566 unsigned Idx = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
11570 // SHUFPS the element to the lowest double word, then movss.
11571 int Mask[4] = { static_cast<int>(Idx), -1, -1, -1 };
11572 MVT VVT = Op.getOperand(0).getSimpleValueType();
11573 SDValue Vec = DAG.getVectorShuffle(VVT, dl, Op.getOperand(0),
11574 DAG.getUNDEF(VVT), Mask);
11575 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, VT, Vec,
11576 DAG.getIntPtrConstant(0, dl));
11579 if (VT.getSizeInBits() == 64) {
11580 // FIXME: .td only matches this for <2 x f64>, not <2 x i64> on 32b
11581 // FIXME: seems like this should be unnecessary if mov{h,l}pd were taught
11582 // to match extract_elt for f64.
11583 if (isNullConstant(Op.getOperand(1)))
11586 // UNPCKHPD the element to the lowest double word, then movsd.
11587 // Note if the lower 64 bits of the result of the UNPCKHPD is then stored
11588 // to a f64mem, the whole operation is folded into a single MOVHPDmr.
11589 int Mask[2] = { 1, -1 };
11590 MVT VVT = Op.getOperand(0).getSimpleValueType();
11591 SDValue Vec = DAG.getVectorShuffle(VVT, dl, Op.getOperand(0),
11592 DAG.getUNDEF(VVT), Mask);
11593 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, VT, Vec,
11594 DAG.getIntPtrConstant(0, dl));
11600 /// Insert one bit to mask vector, like v16i1 or v8i1.
11601 /// AVX-512 feature.
11603 X86TargetLowering::InsertBitToMaskVector(SDValue Op, SelectionDAG &DAG) const {
11605 SDValue Vec = Op.getOperand(0);
11606 SDValue Elt = Op.getOperand(1);
11607 SDValue Idx = Op.getOperand(2);
11608 MVT VecVT = Vec.getSimpleValueType();
11610 if (!isa<ConstantSDNode>(Idx)) {
11611 // Non constant index. Extend source and destination,
11612 // insert element and then truncate the result.
11613 MVT ExtVecVT = (VecVT == MVT::v8i1 ? MVT::v8i64 : MVT::v16i32);
11614 MVT ExtEltVT = (VecVT == MVT::v8i1 ? MVT::i64 : MVT::i32);
11615 SDValue ExtOp = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, ExtVecVT,
11616 DAG.getNode(ISD::ZERO_EXTEND, dl, ExtVecVT, Vec),
11617 DAG.getNode(ISD::ZERO_EXTEND, dl, ExtEltVT, Elt), Idx);
11618 return DAG.getNode(ISD::TRUNCATE, dl, VecVT, ExtOp);
11621 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11622 SDValue EltInVec = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VecVT, Elt);
11624 EltInVec = DAG.getNode(X86ISD::VSHLI, dl, VecVT, EltInVec,
11625 DAG.getConstant(IdxVal, dl, MVT::i8));
11626 if (Vec.getOpcode() == ISD::UNDEF)
11628 return DAG.getNode(ISD::OR, dl, VecVT, Vec, EltInVec);
11631 SDValue X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op,
11632 SelectionDAG &DAG) const {
11633 MVT VT = Op.getSimpleValueType();
11634 MVT EltVT = VT.getVectorElementType();
11636 if (EltVT == MVT::i1)
11637 return InsertBitToMaskVector(Op, DAG);
11640 SDValue N0 = Op.getOperand(0);
11641 SDValue N1 = Op.getOperand(1);
11642 SDValue N2 = Op.getOperand(2);
11643 if (!isa<ConstantSDNode>(N2))
11645 auto *N2C = cast<ConstantSDNode>(N2);
11646 unsigned IdxVal = N2C->getZExtValue();
11648 // If the vector is wider than 128 bits, extract the 128-bit subvector, insert
11649 // into that, and then insert the subvector back into the result.
11650 if (VT.is256BitVector() || VT.is512BitVector()) {
11651 // With a 256-bit vector, we can insert into the zero element efficiently
11652 // using a blend if we have AVX or AVX2 and the right data type.
11653 if (VT.is256BitVector() && IdxVal == 0) {
11654 // TODO: It is worthwhile to cast integer to floating point and back
11655 // and incur a domain crossing penalty if that's what we'll end up
11656 // doing anyway after extracting to a 128-bit vector.
11657 if ((Subtarget->hasAVX() && (EltVT == MVT::f64 || EltVT == MVT::f32)) ||
11658 (Subtarget->hasAVX2() && EltVT == MVT::i32)) {
11659 SDValue N1Vec = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, N1);
11660 N2 = DAG.getIntPtrConstant(1, dl);
11661 return DAG.getNode(X86ISD::BLENDI, dl, VT, N0, N1Vec, N2);
11665 // Get the desired 128-bit vector chunk.
11666 SDValue V = Extract128BitVector(N0, IdxVal, DAG, dl);
11668 // Insert the element into the desired chunk.
11669 unsigned NumEltsIn128 = 128 / EltVT.getSizeInBits();
11670 assert(isPowerOf2_32(NumEltsIn128));
11671 // Since NumEltsIn128 is a power of 2 we can use mask instead of modulo.
11672 unsigned IdxIn128 = IdxVal & (NumEltsIn128 - 1);
11674 V = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, V.getValueType(), V, N1,
11675 DAG.getConstant(IdxIn128, dl, MVT::i32));
11677 // Insert the changed part back into the bigger vector
11678 return Insert128BitVector(N0, V, IdxVal, DAG, dl);
11680 assert(VT.is128BitVector() && "Only 128-bit vector types should be left!");
11682 if (Subtarget->hasSSE41()) {
11683 if (EltVT.getSizeInBits() == 8 || EltVT.getSizeInBits() == 16) {
11685 if (VT == MVT::v8i16) {
11686 Opc = X86ISD::PINSRW;
11688 assert(VT == MVT::v16i8);
11689 Opc = X86ISD::PINSRB;
11692 // Transform it so it match pinsr{b,w} which expects a GR32 as its second
11694 if (N1.getValueType() != MVT::i32)
11695 N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
11696 if (N2.getValueType() != MVT::i32)
11697 N2 = DAG.getIntPtrConstant(IdxVal, dl);
11698 return DAG.getNode(Opc, dl, VT, N0, N1, N2);
11701 if (EltVT == MVT::f32) {
11702 // Bits [7:6] of the constant are the source select. This will always be
11703 // zero here. The DAG Combiner may combine an extract_elt index into
11704 // these bits. For example (insert (extract, 3), 2) could be matched by
11705 // putting the '3' into bits [7:6] of X86ISD::INSERTPS.
11706 // Bits [5:4] of the constant are the destination select. This is the
11707 // value of the incoming immediate.
11708 // Bits [3:0] of the constant are the zero mask. The DAG Combiner may
11709 // combine either bitwise AND or insert of float 0.0 to set these bits.
11711 bool MinSize = DAG.getMachineFunction().getFunction()->optForMinSize();
11712 if (IdxVal == 0 && (!MinSize || !MayFoldLoad(N1))) {
11713 // If this is an insertion of 32-bits into the low 32-bits of
11714 // a vector, we prefer to generate a blend with immediate rather
11715 // than an insertps. Blends are simpler operations in hardware and so
11716 // will always have equal or better performance than insertps.
11717 // But if optimizing for size and there's a load folding opportunity,
11718 // generate insertps because blendps does not have a 32-bit memory
11720 N2 = DAG.getIntPtrConstant(1, dl);
11721 N1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4f32, N1);
11722 return DAG.getNode(X86ISD::BLENDI, dl, VT, N0, N1, N2);
11724 N2 = DAG.getIntPtrConstant(IdxVal << 4, dl);
11725 // Create this as a scalar to vector..
11726 N1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4f32, N1);
11727 return DAG.getNode(X86ISD::INSERTPS, dl, VT, N0, N1, N2);
11730 if (EltVT == MVT::i32 || EltVT == MVT::i64) {
11731 // PINSR* works with constant index.
11736 if (EltVT == MVT::i8)
11739 if (EltVT.getSizeInBits() == 16) {
11740 // Transform it so it match pinsrw which expects a 16-bit value in a GR32
11741 // as its second argument.
11742 if (N1.getValueType() != MVT::i32)
11743 N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
11744 if (N2.getValueType() != MVT::i32)
11745 N2 = DAG.getIntPtrConstant(IdxVal, dl);
11746 return DAG.getNode(X86ISD::PINSRW, dl, VT, N0, N1, N2);
11751 static SDValue LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) {
11753 MVT OpVT = Op.getSimpleValueType();
11755 // If this is a 256-bit vector result, first insert into a 128-bit
11756 // vector and then insert into the 256-bit vector.
11757 if (!OpVT.is128BitVector()) {
11758 // Insert into a 128-bit vector.
11759 unsigned SizeFactor = OpVT.getSizeInBits()/128;
11760 MVT VT128 = MVT::getVectorVT(OpVT.getVectorElementType(),
11761 OpVT.getVectorNumElements() / SizeFactor);
11763 Op = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT128, Op.getOperand(0));
11765 // Insert the 128-bit vector.
11766 return Insert128BitVector(DAG.getUNDEF(OpVT), Op, 0, DAG, dl);
11769 if (OpVT == MVT::v1i64 &&
11770 Op.getOperand(0).getValueType() == MVT::i64)
11771 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v1i64, Op.getOperand(0));
11773 SDValue AnyExt = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, Op.getOperand(0));
11774 assert(OpVT.is128BitVector() && "Expected an SSE type!");
11775 return DAG.getBitcast(
11776 OpVT, DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32, AnyExt));
11779 // Lower a node with an EXTRACT_SUBVECTOR opcode. This may result in
11780 // a simple subregister reference or explicit instructions to grab
11781 // upper bits of a vector.
11782 static SDValue LowerEXTRACT_SUBVECTOR(SDValue Op, const X86Subtarget *Subtarget,
11783 SelectionDAG &DAG) {
11785 SDValue In = Op.getOperand(0);
11786 SDValue Idx = Op.getOperand(1);
11787 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11788 MVT ResVT = Op.getSimpleValueType();
11789 MVT InVT = In.getSimpleValueType();
11791 if (Subtarget->hasFp256()) {
11792 if (ResVT.is128BitVector() &&
11793 (InVT.is256BitVector() || InVT.is512BitVector()) &&
11794 isa<ConstantSDNode>(Idx)) {
11795 return Extract128BitVector(In, IdxVal, DAG, dl);
11797 if (ResVT.is256BitVector() && InVT.is512BitVector() &&
11798 isa<ConstantSDNode>(Idx)) {
11799 return Extract256BitVector(In, IdxVal, DAG, dl);
11805 // Lower a node with an INSERT_SUBVECTOR opcode. This may result in a
11806 // simple superregister reference or explicit instructions to insert
11807 // the upper bits of a vector.
11808 static SDValue LowerINSERT_SUBVECTOR(SDValue Op, const X86Subtarget *Subtarget,
11809 SelectionDAG &DAG) {
11810 if (!Subtarget->hasAVX())
11814 SDValue Vec = Op.getOperand(0);
11815 SDValue SubVec = Op.getOperand(1);
11816 SDValue Idx = Op.getOperand(2);
11818 if (!isa<ConstantSDNode>(Idx))
11821 unsigned IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
11822 MVT OpVT = Op.getSimpleValueType();
11823 MVT SubVecVT = SubVec.getSimpleValueType();
11825 // Fold two 16-byte subvector loads into one 32-byte load:
11826 // (insert_subvector (insert_subvector undef, (load addr), 0),
11827 // (load addr + 16), Elts/2)
11829 if ((IdxVal == OpVT.getVectorNumElements() / 2) &&
11830 Vec.getOpcode() == ISD::INSERT_SUBVECTOR &&
11831 OpVT.is256BitVector() && SubVecVT.is128BitVector()) {
11832 auto *Idx2 = dyn_cast<ConstantSDNode>(Vec.getOperand(2));
11833 if (Idx2 && Idx2->getZExtValue() == 0) {
11834 SDValue SubVec2 = Vec.getOperand(1);
11835 // If needed, look through a bitcast to get to the load.
11836 if (SubVec2.getNode() && SubVec2.getOpcode() == ISD::BITCAST)
11837 SubVec2 = SubVec2.getOperand(0);
11839 if (auto *FirstLd = dyn_cast<LoadSDNode>(SubVec2)) {
11841 unsigned Alignment = FirstLd->getAlignment();
11842 unsigned AS = FirstLd->getAddressSpace();
11843 const X86TargetLowering *TLI = Subtarget->getTargetLowering();
11844 if (TLI->allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(),
11845 OpVT, AS, Alignment, &Fast) && Fast) {
11846 SDValue Ops[] = { SubVec2, SubVec };
11847 if (SDValue Ld = EltsFromConsecutiveLoads(OpVT, Ops, dl, DAG, false))
11854 if ((OpVT.is256BitVector() || OpVT.is512BitVector()) &&
11855 SubVecVT.is128BitVector())
11856 return Insert128BitVector(Vec, SubVec, IdxVal, DAG, dl);
11858 if (OpVT.is512BitVector() && SubVecVT.is256BitVector())
11859 return Insert256BitVector(Vec, SubVec, IdxVal, DAG, dl);
11861 if (OpVT.getVectorElementType() == MVT::i1)
11862 return Insert1BitVector(Op, DAG);
11867 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
11868 // their target countpart wrapped in the X86ISD::Wrapper node. Suppose N is
11869 // one of the above mentioned nodes. It has to be wrapped because otherwise
11870 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
11871 // be used to form addressing mode. These wrapped nodes will be selected
11874 X86TargetLowering::LowerConstantPool(SDValue Op, SelectionDAG &DAG) const {
11875 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
11877 // In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
11878 // global base reg.
11879 unsigned char OpFlag = 0;
11880 unsigned WrapperKind = X86ISD::Wrapper;
11881 CodeModel::Model M = DAG.getTarget().getCodeModel();
11883 if (Subtarget->isPICStyleRIPRel() &&
11884 (M == CodeModel::Small || M == CodeModel::Kernel))
11885 WrapperKind = X86ISD::WrapperRIP;
11886 else if (Subtarget->isPICStyleGOT())
11887 OpFlag = X86II::MO_GOTOFF;
11888 else if (Subtarget->isPICStyleStubPIC())
11889 OpFlag = X86II::MO_PIC_BASE_OFFSET;
11891 auto PtrVT = getPointerTy(DAG.getDataLayout());
11892 SDValue Result = DAG.getTargetConstantPool(
11893 CP->getConstVal(), PtrVT, CP->getAlignment(), CP->getOffset(), OpFlag);
11895 Result = DAG.getNode(WrapperKind, DL, PtrVT, Result);
11896 // With PIC, the address is actually $g + Offset.
11899 DAG.getNode(ISD::ADD, DL, PtrVT,
11900 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT), Result);
11906 SDValue X86TargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) const {
11907 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
11909 // In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
11910 // global base reg.
11911 unsigned char OpFlag = 0;
11912 unsigned WrapperKind = X86ISD::Wrapper;
11913 CodeModel::Model M = DAG.getTarget().getCodeModel();
11915 if (Subtarget->isPICStyleRIPRel() &&
11916 (M == CodeModel::Small || M == CodeModel::Kernel))
11917 WrapperKind = X86ISD::WrapperRIP;
11918 else if (Subtarget->isPICStyleGOT())
11919 OpFlag = X86II::MO_GOTOFF;
11920 else if (Subtarget->isPICStyleStubPIC())
11921 OpFlag = X86II::MO_PIC_BASE_OFFSET;
11923 auto PtrVT = getPointerTy(DAG.getDataLayout());
11924 SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, OpFlag);
11926 Result = DAG.getNode(WrapperKind, DL, PtrVT, Result);
11928 // With PIC, the address is actually $g + Offset.
11931 DAG.getNode(ISD::ADD, DL, PtrVT,
11932 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT), Result);
11938 X86TargetLowering::LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const {
11939 const char *Sym = cast<ExternalSymbolSDNode>(Op)->getSymbol();
11941 // In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
11942 // global base reg.
11943 unsigned char OpFlag = 0;
11944 unsigned WrapperKind = X86ISD::Wrapper;
11945 CodeModel::Model M = DAG.getTarget().getCodeModel();
11947 if (Subtarget->isPICStyleRIPRel() &&
11948 (M == CodeModel::Small || M == CodeModel::Kernel)) {
11949 if (Subtarget->isTargetDarwin() || Subtarget->isTargetELF())
11950 OpFlag = X86II::MO_GOTPCREL;
11951 WrapperKind = X86ISD::WrapperRIP;
11952 } else if (Subtarget->isPICStyleGOT()) {
11953 OpFlag = X86II::MO_GOT;
11954 } else if (Subtarget->isPICStyleStubPIC()) {
11955 OpFlag = X86II::MO_DARWIN_NONLAZY_PIC_BASE;
11956 } else if (Subtarget->isPICStyleStubNoDynamic()) {
11957 OpFlag = X86II::MO_DARWIN_NONLAZY;
11960 auto PtrVT = getPointerTy(DAG.getDataLayout());
11961 SDValue Result = DAG.getTargetExternalSymbol(Sym, PtrVT, OpFlag);
11964 Result = DAG.getNode(WrapperKind, DL, PtrVT, Result);
11966 // With PIC, the address is actually $g + Offset.
11967 if (DAG.getTarget().getRelocationModel() == Reloc::PIC_ &&
11968 !Subtarget->is64Bit()) {
11970 DAG.getNode(ISD::ADD, DL, PtrVT,
11971 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT), Result);
11974 // For symbols that require a load from a stub to get the address, emit the
11976 if (isGlobalStubReference(OpFlag))
11977 Result = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), Result,
11978 MachinePointerInfo::getGOT(DAG.getMachineFunction()),
11979 false, false, false, 0);
11985 X86TargetLowering::LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const {
11986 // Create the TargetBlockAddressAddress node.
11987 unsigned char OpFlags =
11988 Subtarget->ClassifyBlockAddressReference();
11989 CodeModel::Model M = DAG.getTarget().getCodeModel();
11990 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
11991 int64_t Offset = cast<BlockAddressSDNode>(Op)->getOffset();
11993 auto PtrVT = getPointerTy(DAG.getDataLayout());
11994 SDValue Result = DAG.getTargetBlockAddress(BA, PtrVT, Offset, OpFlags);
11996 if (Subtarget->isPICStyleRIPRel() &&
11997 (M == CodeModel::Small || M == CodeModel::Kernel))
11998 Result = DAG.getNode(X86ISD::WrapperRIP, dl, PtrVT, Result);
12000 Result = DAG.getNode(X86ISD::Wrapper, dl, PtrVT, Result);
12002 // With PIC, the address is actually $g + Offset.
12003 if (isGlobalRelativeToPICBase(OpFlags)) {
12004 Result = DAG.getNode(ISD::ADD, dl, PtrVT,
12005 DAG.getNode(X86ISD::GlobalBaseReg, dl, PtrVT), Result);
12012 X86TargetLowering::LowerGlobalAddress(const GlobalValue *GV, SDLoc dl,
12013 int64_t Offset, SelectionDAG &DAG) const {
12014 // Create the TargetGlobalAddress node, folding in the constant
12015 // offset if it is legal.
12016 unsigned char OpFlags =
12017 Subtarget->ClassifyGlobalReference(GV, DAG.getTarget());
12018 CodeModel::Model M = DAG.getTarget().getCodeModel();
12019 auto PtrVT = getPointerTy(DAG.getDataLayout());
12021 if (OpFlags == X86II::MO_NO_FLAG &&
12022 X86::isOffsetSuitableForCodeModel(Offset, M)) {
12023 // A direct static reference to a global.
12024 Result = DAG.getTargetGlobalAddress(GV, dl, PtrVT, Offset);
12027 Result = DAG.getTargetGlobalAddress(GV, dl, PtrVT, 0, OpFlags);
12030 if (Subtarget->isPICStyleRIPRel() &&
12031 (M == CodeModel::Small || M == CodeModel::Kernel))
12032 Result = DAG.getNode(X86ISD::WrapperRIP, dl, PtrVT, Result);
12034 Result = DAG.getNode(X86ISD::Wrapper, dl, PtrVT, Result);
12036 // With PIC, the address is actually $g + Offset.
12037 if (isGlobalRelativeToPICBase(OpFlags)) {
12038 Result = DAG.getNode(ISD::ADD, dl, PtrVT,
12039 DAG.getNode(X86ISD::GlobalBaseReg, dl, PtrVT), Result);
12042 // For globals that require a load from a stub to get the address, emit the
12044 if (isGlobalStubReference(OpFlags))
12045 Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Result,
12046 MachinePointerInfo::getGOT(DAG.getMachineFunction()),
12047 false, false, false, 0);
12049 // If there was a non-zero offset that we didn't fold, create an explicit
12050 // addition for it.
12052 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result,
12053 DAG.getConstant(Offset, dl, PtrVT));
12059 X86TargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const {
12060 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
12061 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
12062 return LowerGlobalAddress(GV, SDLoc(Op), Offset, DAG);
12066 GetTLSADDR(SelectionDAG &DAG, SDValue Chain, GlobalAddressSDNode *GA,
12067 SDValue *InFlag, const EVT PtrVT, unsigned ReturnReg,
12068 unsigned char OperandFlags, bool LocalDynamic = false) {
12069 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
12070 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
12072 SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
12073 GA->getValueType(0),
12077 X86ISD::NodeType CallType = LocalDynamic ? X86ISD::TLSBASEADDR
12081 SDValue Ops[] = { Chain, TGA, *InFlag };
12082 Chain = DAG.getNode(CallType, dl, NodeTys, Ops);
12084 SDValue Ops[] = { Chain, TGA };
12085 Chain = DAG.getNode(CallType, dl, NodeTys, Ops);
12088 // TLSADDR will be codegen'ed as call. Inform MFI that function has calls.
12089 MFI->setAdjustsStack(true);
12090 MFI->setHasCalls(true);
12092 SDValue Flag = Chain.getValue(1);
12093 return DAG.getCopyFromReg(Chain, dl, ReturnReg, PtrVT, Flag);
12096 // Lower ISD::GlobalTLSAddress using the "general dynamic" model, 32 bit
12098 LowerToTLSGeneralDynamicModel32(GlobalAddressSDNode *GA, SelectionDAG &DAG,
12101 SDLoc dl(GA); // ? function entry point might be better
12102 SDValue Chain = DAG.getCopyToReg(DAG.getEntryNode(), dl, X86::EBX,
12103 DAG.getNode(X86ISD::GlobalBaseReg,
12104 SDLoc(), PtrVT), InFlag);
12105 InFlag = Chain.getValue(1);
12107 return GetTLSADDR(DAG, Chain, GA, &InFlag, PtrVT, X86::EAX, X86II::MO_TLSGD);
12110 // Lower ISD::GlobalTLSAddress using the "general dynamic" model, 64 bit
12112 LowerToTLSGeneralDynamicModel64(GlobalAddressSDNode *GA, SelectionDAG &DAG,
12114 return GetTLSADDR(DAG, DAG.getEntryNode(), GA, nullptr, PtrVT,
12115 X86::RAX, X86II::MO_TLSGD);
12118 static SDValue LowerToTLSLocalDynamicModel(GlobalAddressSDNode *GA,
12124 // Get the start address of the TLS block for this module.
12125 X86MachineFunctionInfo* MFI = DAG.getMachineFunction()
12126 .getInfo<X86MachineFunctionInfo>();
12127 MFI->incNumLocalDynamicTLSAccesses();
12131 Base = GetTLSADDR(DAG, DAG.getEntryNode(), GA, nullptr, PtrVT, X86::RAX,
12132 X86II::MO_TLSLD, /*LocalDynamic=*/true);
12135 SDValue Chain = DAG.getCopyToReg(DAG.getEntryNode(), dl, X86::EBX,
12136 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT), InFlag);
12137 InFlag = Chain.getValue(1);
12138 Base = GetTLSADDR(DAG, Chain, GA, &InFlag, PtrVT, X86::EAX,
12139 X86II::MO_TLSLDM, /*LocalDynamic=*/true);
12142 // Note: the CleanupLocalDynamicTLSPass will remove redundant computations
12146 unsigned char OperandFlags = X86II::MO_DTPOFF;
12147 unsigned WrapperKind = X86ISD::Wrapper;
12148 SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
12149 GA->getValueType(0),
12150 GA->getOffset(), OperandFlags);
12151 SDValue Offset = DAG.getNode(WrapperKind, dl, PtrVT, TGA);
12153 // Add x@dtpoff with the base.
12154 return DAG.getNode(ISD::ADD, dl, PtrVT, Offset, Base);
12157 // Lower ISD::GlobalTLSAddress using the "initial exec" or "local exec" model.
12158 static SDValue LowerToTLSExecModel(GlobalAddressSDNode *GA, SelectionDAG &DAG,
12159 const EVT PtrVT, TLSModel::Model model,
12160 bool is64Bit, bool isPIC) {
12163 // Get the Thread Pointer, which is %gs:0 (32-bit) or %fs:0 (64-bit).
12164 Value *Ptr = Constant::getNullValue(Type::getInt8PtrTy(*DAG.getContext(),
12165 is64Bit ? 257 : 256));
12167 SDValue ThreadPointer =
12168 DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), DAG.getIntPtrConstant(0, dl),
12169 MachinePointerInfo(Ptr), false, false, false, 0);
12171 unsigned char OperandFlags = 0;
12172 // Most TLS accesses are not RIP relative, even on x86-64. One exception is
12174 unsigned WrapperKind = X86ISD::Wrapper;
12175 if (model == TLSModel::LocalExec) {
12176 OperandFlags = is64Bit ? X86II::MO_TPOFF : X86II::MO_NTPOFF;
12177 } else if (model == TLSModel::InitialExec) {
12179 OperandFlags = X86II::MO_GOTTPOFF;
12180 WrapperKind = X86ISD::WrapperRIP;
12182 OperandFlags = isPIC ? X86II::MO_GOTNTPOFF : X86II::MO_INDNTPOFF;
12185 llvm_unreachable("Unexpected model");
12188 // emit "addl x@ntpoff,%eax" (local exec)
12189 // or "addl x@indntpoff,%eax" (initial exec)
12190 // or "addl x@gotntpoff(%ebx) ,%eax" (initial exec, 32-bit pic)
12192 DAG.getTargetGlobalAddress(GA->getGlobal(), dl, GA->getValueType(0),
12193 GA->getOffset(), OperandFlags);
12194 SDValue Offset = DAG.getNode(WrapperKind, dl, PtrVT, TGA);
12196 if (model == TLSModel::InitialExec) {
12197 if (isPIC && !is64Bit) {
12198 Offset = DAG.getNode(ISD::ADD, dl, PtrVT,
12199 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT),
12203 Offset = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Offset,
12204 MachinePointerInfo::getGOT(DAG.getMachineFunction()),
12205 false, false, false, 0);
12208 // The address of the thread local variable is the add of the thread
12209 // pointer with the offset of the variable.
12210 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
12214 X86TargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
12216 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
12217 const GlobalValue *GV = GA->getGlobal();
12218 auto PtrVT = getPointerTy(DAG.getDataLayout());
12220 if (Subtarget->isTargetELF()) {
12221 if (DAG.getTarget().Options.EmulatedTLS)
12222 return LowerToTLSEmulatedModel(GA, DAG);
12223 TLSModel::Model model = DAG.getTarget().getTLSModel(GV);
12225 case TLSModel::GeneralDynamic:
12226 if (Subtarget->is64Bit())
12227 return LowerToTLSGeneralDynamicModel64(GA, DAG, PtrVT);
12228 return LowerToTLSGeneralDynamicModel32(GA, DAG, PtrVT);
12229 case TLSModel::LocalDynamic:
12230 return LowerToTLSLocalDynamicModel(GA, DAG, PtrVT,
12231 Subtarget->is64Bit());
12232 case TLSModel::InitialExec:
12233 case TLSModel::LocalExec:
12234 return LowerToTLSExecModel(GA, DAG, PtrVT, model, Subtarget->is64Bit(),
12235 DAG.getTarget().getRelocationModel() ==
12238 llvm_unreachable("Unknown TLS model.");
12241 if (Subtarget->isTargetDarwin()) {
12242 // Darwin only has one model of TLS. Lower to that.
12243 unsigned char OpFlag = 0;
12244 unsigned WrapperKind = Subtarget->isPICStyleRIPRel() ?
12245 X86ISD::WrapperRIP : X86ISD::Wrapper;
12247 // In PIC mode (unless we're in RIPRel PIC mode) we add an offset to the
12248 // global base reg.
12249 bool PIC32 = (DAG.getTarget().getRelocationModel() == Reloc::PIC_) &&
12250 !Subtarget->is64Bit();
12252 OpFlag = X86II::MO_TLVP_PIC_BASE;
12254 OpFlag = X86II::MO_TLVP;
12256 SDValue Result = DAG.getTargetGlobalAddress(GA->getGlobal(), DL,
12257 GA->getValueType(0),
12258 GA->getOffset(), OpFlag);
12259 SDValue Offset = DAG.getNode(WrapperKind, DL, PtrVT, Result);
12261 // With PIC32, the address is actually $g + Offset.
12263 Offset = DAG.getNode(ISD::ADD, DL, PtrVT,
12264 DAG.getNode(X86ISD::GlobalBaseReg, SDLoc(), PtrVT),
12267 // Lowering the machine isd will make sure everything is in the right
12269 SDValue Chain = DAG.getEntryNode();
12270 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
12271 SDValue Args[] = { Chain, Offset };
12272 Chain = DAG.getNode(X86ISD::TLSCALL, DL, NodeTys, Args);
12274 // TLSCALL will be codegen'ed as call. Inform MFI that function has calls.
12275 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
12276 MFI->setAdjustsStack(true);
12278 // And our return value (tls address) is in the standard call return value
12280 unsigned Reg = Subtarget->is64Bit() ? X86::RAX : X86::EAX;
12281 return DAG.getCopyFromReg(Chain, DL, Reg, PtrVT, Chain.getValue(1));
12284 if (Subtarget->isTargetKnownWindowsMSVC() ||
12285 Subtarget->isTargetWindowsGNU()) {
12286 // Just use the implicit TLS architecture
12287 // Need to generate someting similar to:
12288 // mov rdx, qword [gs:abs 58H]; Load pointer to ThreadLocalStorage
12290 // mov ecx, dword [rel _tls_index]: Load index (from C runtime)
12291 // mov rcx, qword [rdx+rcx*8]
12292 // mov eax, .tls$:tlsvar
12293 // [rax+rcx] contains the address
12294 // Windows 64bit: gs:0x58
12295 // Windows 32bit: fs:__tls_array
12298 SDValue Chain = DAG.getEntryNode();
12300 // Get the Thread Pointer, which is %fs:__tls_array (32-bit) or
12301 // %gs:0x58 (64-bit). On MinGW, __tls_array is not available, so directly
12302 // use its literal value of 0x2C.
12303 Value *Ptr = Constant::getNullValue(Subtarget->is64Bit()
12304 ? Type::getInt8PtrTy(*DAG.getContext(),
12306 : Type::getInt32PtrTy(*DAG.getContext(),
12309 SDValue TlsArray = Subtarget->is64Bit()
12310 ? DAG.getIntPtrConstant(0x58, dl)
12311 : (Subtarget->isTargetWindowsGNU()
12312 ? DAG.getIntPtrConstant(0x2C, dl)
12313 : DAG.getExternalSymbol("_tls_array", PtrVT));
12315 SDValue ThreadPointer =
12316 DAG.getLoad(PtrVT, dl, Chain, TlsArray, MachinePointerInfo(Ptr), false,
12320 if (GV->getThreadLocalMode() == GlobalVariable::LocalExecTLSModel) {
12321 res = ThreadPointer;
12323 // Load the _tls_index variable
12324 SDValue IDX = DAG.getExternalSymbol("_tls_index", PtrVT);
12325 if (Subtarget->is64Bit())
12326 IDX = DAG.getExtLoad(ISD::ZEXTLOAD, dl, PtrVT, Chain, IDX,
12327 MachinePointerInfo(), MVT::i32, false, false,
12330 IDX = DAG.getLoad(PtrVT, dl, Chain, IDX, MachinePointerInfo(), false,
12333 auto &DL = DAG.getDataLayout();
12335 DAG.getConstant(Log2_64_Ceil(DL.getPointerSize()), dl, PtrVT);
12336 IDX = DAG.getNode(ISD::SHL, dl, PtrVT, IDX, Scale);
12338 res = DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, IDX);
12341 res = DAG.getLoad(PtrVT, dl, Chain, res, MachinePointerInfo(), false, false,
12344 // Get the offset of start of .tls section
12345 SDValue TGA = DAG.getTargetGlobalAddress(GA->getGlobal(), dl,
12346 GA->getValueType(0),
12347 GA->getOffset(), X86II::MO_SECREL);
12348 SDValue Offset = DAG.getNode(X86ISD::Wrapper, dl, PtrVT, TGA);
12350 // The address of the thread local variable is the add of the thread
12351 // pointer with the offset of the variable.
12352 return DAG.getNode(ISD::ADD, dl, PtrVT, res, Offset);
12355 llvm_unreachable("TLS not implemented for this target.");
12358 /// LowerShiftParts - Lower SRA_PARTS and friends, which return two i32 values
12359 /// and take a 2 x i32 value to shift plus a shift amount.
12360 static SDValue LowerShiftParts(SDValue Op, SelectionDAG &DAG) {
12361 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
12362 MVT VT = Op.getSimpleValueType();
12363 unsigned VTBits = VT.getSizeInBits();
12365 bool isSRA = Op.getOpcode() == ISD::SRA_PARTS;
12366 SDValue ShOpLo = Op.getOperand(0);
12367 SDValue ShOpHi = Op.getOperand(1);
12368 SDValue ShAmt = Op.getOperand(2);
12369 // X86ISD::SHLD and X86ISD::SHRD have defined overflow behavior but the
12370 // generic ISD nodes haven't. Insert an AND to be safe, it's optimized away
12372 SDValue SafeShAmt = DAG.getNode(ISD::AND, dl, MVT::i8, ShAmt,
12373 DAG.getConstant(VTBits - 1, dl, MVT::i8));
12374 SDValue Tmp1 = isSRA ? DAG.getNode(ISD::SRA, dl, VT, ShOpHi,
12375 DAG.getConstant(VTBits - 1, dl, MVT::i8))
12376 : DAG.getConstant(0, dl, VT);
12378 SDValue Tmp2, Tmp3;
12379 if (Op.getOpcode() == ISD::SHL_PARTS) {
12380 Tmp2 = DAG.getNode(X86ISD::SHLD, dl, VT, ShOpHi, ShOpLo, ShAmt);
12381 Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, SafeShAmt);
12383 Tmp2 = DAG.getNode(X86ISD::SHRD, dl, VT, ShOpLo, ShOpHi, ShAmt);
12384 Tmp3 = DAG.getNode(isSRA ? ISD::SRA : ISD::SRL, dl, VT, ShOpHi, SafeShAmt);
12387 // If the shift amount is larger or equal than the width of a part we can't
12388 // rely on the results of shld/shrd. Insert a test and select the appropriate
12389 // values for large shift amounts.
12390 SDValue AndNode = DAG.getNode(ISD::AND, dl, MVT::i8, ShAmt,
12391 DAG.getConstant(VTBits, dl, MVT::i8));
12392 SDValue Cond = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
12393 AndNode, DAG.getConstant(0, dl, MVT::i8));
12396 SDValue CC = DAG.getConstant(X86::COND_NE, dl, MVT::i8);
12397 SDValue Ops0[4] = { Tmp2, Tmp3, CC, Cond };
12398 SDValue Ops1[4] = { Tmp3, Tmp1, CC, Cond };
12400 if (Op.getOpcode() == ISD::SHL_PARTS) {
12401 Hi = DAG.getNode(X86ISD::CMOV, dl, VT, Ops0);
12402 Lo = DAG.getNode(X86ISD::CMOV, dl, VT, Ops1);
12404 Lo = DAG.getNode(X86ISD::CMOV, dl, VT, Ops0);
12405 Hi = DAG.getNode(X86ISD::CMOV, dl, VT, Ops1);
12408 SDValue Ops[2] = { Lo, Hi };
12409 return DAG.getMergeValues(Ops, dl);
12412 SDValue X86TargetLowering::LowerSINT_TO_FP(SDValue Op,
12413 SelectionDAG &DAG) const {
12414 SDValue Src = Op.getOperand(0);
12415 MVT SrcVT = Src.getSimpleValueType();
12416 MVT VT = Op.getSimpleValueType();
12419 if (SrcVT.isVector()) {
12420 if (SrcVT == MVT::v2i32 && VT == MVT::v2f64) {
12421 return DAG.getNode(X86ISD::CVTDQ2PD, dl, VT,
12422 DAG.getNode(ISD::CONCAT_VECTORS, dl, MVT::v4i32, Src,
12423 DAG.getUNDEF(SrcVT)));
12425 if (SrcVT.getVectorElementType() == MVT::i1) {
12426 MVT IntegerVT = MVT::getVectorVT(MVT::i32, SrcVT.getVectorNumElements());
12427 return DAG.getNode(ISD::SINT_TO_FP, dl, Op.getValueType(),
12428 DAG.getNode(ISD::SIGN_EXTEND, dl, IntegerVT, Src));
12433 assert(SrcVT <= MVT::i64 && SrcVT >= MVT::i16 &&
12434 "Unknown SINT_TO_FP to lower!");
12436 // These are really Legal; return the operand so the caller accepts it as
12438 if (SrcVT == MVT::i32 && isScalarFPTypeInSSEReg(Op.getValueType()))
12440 if (SrcVT == MVT::i64 && isScalarFPTypeInSSEReg(Op.getValueType()) &&
12441 Subtarget->is64Bit()) {
12445 unsigned Size = SrcVT.getSizeInBits()/8;
12446 MachineFunction &MF = DAG.getMachineFunction();
12447 auto PtrVT = getPointerTy(MF.getDataLayout());
12448 int SSFI = MF.getFrameInfo()->CreateStackObject(Size, Size, false);
12449 SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
12450 SDValue Chain = DAG.getStore(
12451 DAG.getEntryNode(), dl, Op.getOperand(0), StackSlot,
12452 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI), false,
12454 return BuildFILD(Op, SrcVT, Chain, StackSlot, DAG);
12457 SDValue X86TargetLowering::BuildFILD(SDValue Op, EVT SrcVT, SDValue Chain,
12459 SelectionDAG &DAG) const {
12463 bool useSSE = isScalarFPTypeInSSEReg(Op.getValueType());
12465 Tys = DAG.getVTList(MVT::f64, MVT::Other, MVT::Glue);
12467 Tys = DAG.getVTList(Op.getValueType(), MVT::Other);
12469 unsigned ByteSize = SrcVT.getSizeInBits()/8;
12471 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(StackSlot);
12472 MachineMemOperand *MMO;
12474 int SSFI = FI->getIndex();
12475 MMO = DAG.getMachineFunction().getMachineMemOperand(
12476 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI),
12477 MachineMemOperand::MOLoad, ByteSize, ByteSize);
12479 MMO = cast<LoadSDNode>(StackSlot)->getMemOperand();
12480 StackSlot = StackSlot.getOperand(1);
12482 SDValue Ops[] = { Chain, StackSlot, DAG.getValueType(SrcVT) };
12483 SDValue Result = DAG.getMemIntrinsicNode(useSSE ? X86ISD::FILD_FLAG :
12485 Tys, Ops, SrcVT, MMO);
12488 Chain = Result.getValue(1);
12489 SDValue InFlag = Result.getValue(2);
12491 // FIXME: Currently the FST is flagged to the FILD_FLAG. This
12492 // shouldn't be necessary except that RFP cannot be live across
12493 // multiple blocks. When stackifier is fixed, they can be uncoupled.
12494 MachineFunction &MF = DAG.getMachineFunction();
12495 unsigned SSFISize = Op.getValueType().getSizeInBits()/8;
12496 int SSFI = MF.getFrameInfo()->CreateStackObject(SSFISize, SSFISize, false);
12497 auto PtrVT = getPointerTy(MF.getDataLayout());
12498 SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
12499 Tys = DAG.getVTList(MVT::Other);
12501 Chain, Result, StackSlot, DAG.getValueType(Op.getValueType()), InFlag
12503 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
12504 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI),
12505 MachineMemOperand::MOStore, SSFISize, SSFISize);
12507 Chain = DAG.getMemIntrinsicNode(X86ISD::FST, DL, Tys,
12508 Ops, Op.getValueType(), MMO);
12509 Result = DAG.getLoad(
12510 Op.getValueType(), DL, Chain, StackSlot,
12511 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI),
12512 false, false, false, 0);
12518 // LowerUINT_TO_FP_i64 - 64-bit unsigned integer to double expansion.
12519 SDValue X86TargetLowering::LowerUINT_TO_FP_i64(SDValue Op,
12520 SelectionDAG &DAG) const {
12521 // This algorithm is not obvious. Here it is what we're trying to output:
12524 punpckldq (c0), %xmm0 // c0: (uint4){ 0x43300000U, 0x45300000U, 0U, 0U }
12525 subpd (c1), %xmm0 // c1: (double2){ 0x1.0p52, 0x1.0p52 * 0x1.0p32 }
12527 haddpd %xmm0, %xmm0
12529 pshufd $0x4e, %xmm0, %xmm1
12535 LLVMContext *Context = DAG.getContext();
12537 // Build some magic constants.
12538 static const uint32_t CV0[] = { 0x43300000, 0x45300000, 0, 0 };
12539 Constant *C0 = ConstantDataVector::get(*Context, CV0);
12540 auto PtrVT = getPointerTy(DAG.getDataLayout());
12541 SDValue CPIdx0 = DAG.getConstantPool(C0, PtrVT, 16);
12543 SmallVector<Constant*,2> CV1;
12545 ConstantFP::get(*Context, APFloat(APFloat::IEEEdouble,
12546 APInt(64, 0x4330000000000000ULL))));
12548 ConstantFP::get(*Context, APFloat(APFloat::IEEEdouble,
12549 APInt(64, 0x4530000000000000ULL))));
12550 Constant *C1 = ConstantVector::get(CV1);
12551 SDValue CPIdx1 = DAG.getConstantPool(C1, PtrVT, 16);
12553 // Load the 64-bit value into an XMM register.
12554 SDValue XR1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2i64,
12557 DAG.getLoad(MVT::v4i32, dl, DAG.getEntryNode(), CPIdx0,
12558 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
12559 false, false, false, 16);
12561 getUnpackl(DAG, dl, MVT::v4i32, DAG.getBitcast(MVT::v4i32, XR1), CLod0);
12564 DAG.getLoad(MVT::v2f64, dl, CLod0.getValue(1), CPIdx1,
12565 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
12566 false, false, false, 16);
12567 SDValue XR2F = DAG.getBitcast(MVT::v2f64, Unpck1);
12568 // TODO: Are there any fast-math-flags to propagate here?
12569 SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::v2f64, XR2F, CLod1);
12572 if (Subtarget->hasSSE3()) {
12573 // FIXME: The 'haddpd' instruction may be slower than 'movhlps + addsd'.
12574 Result = DAG.getNode(X86ISD::FHADD, dl, MVT::v2f64, Sub, Sub);
12576 SDValue S2F = DAG.getBitcast(MVT::v4i32, Sub);
12577 SDValue Shuffle = getTargetShuffleNode(X86ISD::PSHUFD, dl, MVT::v4i32,
12579 Result = DAG.getNode(ISD::FADD, dl, MVT::v2f64,
12580 DAG.getBitcast(MVT::v2f64, Shuffle), Sub);
12583 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Result,
12584 DAG.getIntPtrConstant(0, dl));
12587 // LowerUINT_TO_FP_i32 - 32-bit unsigned integer to float expansion.
12588 SDValue X86TargetLowering::LowerUINT_TO_FP_i32(SDValue Op,
12589 SelectionDAG &DAG) const {
12591 // FP constant to bias correct the final result.
12592 SDValue Bias = DAG.getConstantFP(BitsToDouble(0x4330000000000000ULL), dl,
12595 // Load the 32-bit value into an XMM register.
12596 SDValue Load = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4i32,
12599 // Zero out the upper parts of the register.
12600 Load = getShuffleVectorZeroOrUndef(Load, 0, true, Subtarget, DAG);
12602 Load = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
12603 DAG.getBitcast(MVT::v2f64, Load),
12604 DAG.getIntPtrConstant(0, dl));
12606 // Or the load with the bias.
12607 SDValue Or = DAG.getNode(
12608 ISD::OR, dl, MVT::v2i64,
12609 DAG.getBitcast(MVT::v2i64,
12610 DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2f64, Load)),
12611 DAG.getBitcast(MVT::v2i64,
12612 DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v2f64, Bias)));
12614 DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
12615 DAG.getBitcast(MVT::v2f64, Or), DAG.getIntPtrConstant(0, dl));
12617 // Subtract the bias.
12618 // TODO: Are there any fast-math-flags to propagate here?
12619 SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::f64, Or, Bias);
12621 // Handle final rounding.
12622 MVT DestVT = Op.getSimpleValueType();
12624 if (DestVT.bitsLT(MVT::f64))
12625 return DAG.getNode(ISD::FP_ROUND, dl, DestVT, Sub,
12626 DAG.getIntPtrConstant(0, dl));
12627 if (DestVT.bitsGT(MVT::f64))
12628 return DAG.getNode(ISD::FP_EXTEND, dl, DestVT, Sub);
12630 // Handle final rounding.
12634 static SDValue lowerUINT_TO_FP_vXi32(SDValue Op, SelectionDAG &DAG,
12635 const X86Subtarget &Subtarget) {
12636 // The algorithm is the following:
12637 // #ifdef __SSE4_1__
12638 // uint4 lo = _mm_blend_epi16( v, (uint4) 0x4b000000, 0xaa);
12639 // uint4 hi = _mm_blend_epi16( _mm_srli_epi32(v,16),
12640 // (uint4) 0x53000000, 0xaa);
12642 // uint4 lo = (v & (uint4) 0xffff) | (uint4) 0x4b000000;
12643 // uint4 hi = (v >> 16) | (uint4) 0x53000000;
12645 // float4 fhi = (float4) hi - (0x1.0p39f + 0x1.0p23f);
12646 // return (float4) lo + fhi;
12648 // We shouldn't use it when unsafe-fp-math is enabled though: we might later
12649 // reassociate the two FADDs, and if we do that, the algorithm fails
12650 // spectacularly (PR24512).
12651 // FIXME: If we ever have some kind of Machine FMF, this should be marked
12652 // as non-fast and always be enabled. Why isn't SDAG FMF enough? Because
12653 // there's also the MachineCombiner reassociations happening on Machine IR.
12654 if (DAG.getTarget().Options.UnsafeFPMath)
12658 SDValue V = Op->getOperand(0);
12659 MVT VecIntVT = V.getSimpleValueType();
12660 bool Is128 = VecIntVT == MVT::v4i32;
12661 MVT VecFloatVT = Is128 ? MVT::v4f32 : MVT::v8f32;
12662 // If we convert to something else than the supported type, e.g., to v4f64,
12664 if (VecFloatVT != Op->getSimpleValueType(0))
12667 unsigned NumElts = VecIntVT.getVectorNumElements();
12668 assert((VecIntVT == MVT::v4i32 || VecIntVT == MVT::v8i32) &&
12669 "Unsupported custom type");
12670 assert(NumElts <= 8 && "The size of the constant array must be fixed");
12672 // In the #idef/#else code, we have in common:
12673 // - The vector of constants:
12679 // Create the splat vector for 0x4b000000.
12680 SDValue CstLow = DAG.getConstant(0x4b000000, DL, MVT::i32);
12681 SDValue CstLowArray[] = {CstLow, CstLow, CstLow, CstLow,
12682 CstLow, CstLow, CstLow, CstLow};
12683 SDValue VecCstLow = DAG.getNode(ISD::BUILD_VECTOR, DL, VecIntVT,
12684 makeArrayRef(&CstLowArray[0], NumElts));
12685 // Create the splat vector for 0x53000000.
12686 SDValue CstHigh = DAG.getConstant(0x53000000, DL, MVT::i32);
12687 SDValue CstHighArray[] = {CstHigh, CstHigh, CstHigh, CstHigh,
12688 CstHigh, CstHigh, CstHigh, CstHigh};
12689 SDValue VecCstHigh = DAG.getNode(ISD::BUILD_VECTOR, DL, VecIntVT,
12690 makeArrayRef(&CstHighArray[0], NumElts));
12692 // Create the right shift.
12693 SDValue CstShift = DAG.getConstant(16, DL, MVT::i32);
12694 SDValue CstShiftArray[] = {CstShift, CstShift, CstShift, CstShift,
12695 CstShift, CstShift, CstShift, CstShift};
12696 SDValue VecCstShift = DAG.getNode(ISD::BUILD_VECTOR, DL, VecIntVT,
12697 makeArrayRef(&CstShiftArray[0], NumElts));
12698 SDValue HighShift = DAG.getNode(ISD::SRL, DL, VecIntVT, V, VecCstShift);
12701 if (Subtarget.hasSSE41()) {
12702 MVT VecI16VT = Is128 ? MVT::v8i16 : MVT::v16i16;
12703 // uint4 lo = _mm_blend_epi16( v, (uint4) 0x4b000000, 0xaa);
12704 SDValue VecCstLowBitcast = DAG.getBitcast(VecI16VT, VecCstLow);
12705 SDValue VecBitcast = DAG.getBitcast(VecI16VT, V);
12706 // Low will be bitcasted right away, so do not bother bitcasting back to its
12708 Low = DAG.getNode(X86ISD::BLENDI, DL, VecI16VT, VecBitcast,
12709 VecCstLowBitcast, DAG.getConstant(0xaa, DL, MVT::i32));
12710 // uint4 hi = _mm_blend_epi16( _mm_srli_epi32(v,16),
12711 // (uint4) 0x53000000, 0xaa);
12712 SDValue VecCstHighBitcast = DAG.getBitcast(VecI16VT, VecCstHigh);
12713 SDValue VecShiftBitcast = DAG.getBitcast(VecI16VT, HighShift);
12714 // High will be bitcasted right away, so do not bother bitcasting back to
12715 // its original type.
12716 High = DAG.getNode(X86ISD::BLENDI, DL, VecI16VT, VecShiftBitcast,
12717 VecCstHighBitcast, DAG.getConstant(0xaa, DL, MVT::i32));
12719 SDValue CstMask = DAG.getConstant(0xffff, DL, MVT::i32);
12720 SDValue VecCstMask = DAG.getNode(ISD::BUILD_VECTOR, DL, VecIntVT, CstMask,
12721 CstMask, CstMask, CstMask);
12722 // uint4 lo = (v & (uint4) 0xffff) | (uint4) 0x4b000000;
12723 SDValue LowAnd = DAG.getNode(ISD::AND, DL, VecIntVT, V, VecCstMask);
12724 Low = DAG.getNode(ISD::OR, DL, VecIntVT, LowAnd, VecCstLow);
12726 // uint4 hi = (v >> 16) | (uint4) 0x53000000;
12727 High = DAG.getNode(ISD::OR, DL, VecIntVT, HighShift, VecCstHigh);
12730 // Create the vector constant for -(0x1.0p39f + 0x1.0p23f).
12731 SDValue CstFAdd = DAG.getConstantFP(
12732 APFloat(APFloat::IEEEsingle, APInt(32, 0xD3000080)), DL, MVT::f32);
12733 SDValue CstFAddArray[] = {CstFAdd, CstFAdd, CstFAdd, CstFAdd,
12734 CstFAdd, CstFAdd, CstFAdd, CstFAdd};
12735 SDValue VecCstFAdd = DAG.getNode(ISD::BUILD_VECTOR, DL, VecFloatVT,
12736 makeArrayRef(&CstFAddArray[0], NumElts));
12738 // float4 fhi = (float4) hi - (0x1.0p39f + 0x1.0p23f);
12739 SDValue HighBitcast = DAG.getBitcast(VecFloatVT, High);
12740 // TODO: Are there any fast-math-flags to propagate here?
12742 DAG.getNode(ISD::FADD, DL, VecFloatVT, HighBitcast, VecCstFAdd);
12743 // return (float4) lo + fhi;
12744 SDValue LowBitcast = DAG.getBitcast(VecFloatVT, Low);
12745 return DAG.getNode(ISD::FADD, DL, VecFloatVT, LowBitcast, FHigh);
12748 SDValue X86TargetLowering::lowerUINT_TO_FP_vec(SDValue Op,
12749 SelectionDAG &DAG) const {
12750 SDValue N0 = Op.getOperand(0);
12751 MVT SVT = N0.getSimpleValueType();
12754 switch (SVT.SimpleTy) {
12756 llvm_unreachable("Custom UINT_TO_FP is not supported!");
12761 MVT NVT = MVT::getVectorVT(MVT::i32, SVT.getVectorNumElements());
12762 return DAG.getNode(ISD::SINT_TO_FP, dl, Op.getValueType(),
12763 DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, N0));
12767 return lowerUINT_TO_FP_vXi32(Op, DAG, *Subtarget);
12770 assert(Subtarget->hasAVX512());
12771 return DAG.getNode(ISD::UINT_TO_FP, dl, Op.getValueType(),
12772 DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::v16i32, N0));
12776 SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op,
12777 SelectionDAG &DAG) const {
12778 SDValue N0 = Op.getOperand(0);
12780 auto PtrVT = getPointerTy(DAG.getDataLayout());
12782 if (Op.getSimpleValueType().isVector())
12783 return lowerUINT_TO_FP_vec(Op, DAG);
12785 // Since UINT_TO_FP is legal (it's marked custom), dag combiner won't
12786 // optimize it to a SINT_TO_FP when the sign bit is known zero. Perform
12787 // the optimization here.
12788 if (DAG.SignBitIsZero(N0))
12789 return DAG.getNode(ISD::SINT_TO_FP, dl, Op.getValueType(), N0);
12791 MVT SrcVT = N0.getSimpleValueType();
12792 MVT DstVT = Op.getSimpleValueType();
12794 if (Subtarget->hasAVX512() && isScalarFPTypeInSSEReg(DstVT) &&
12795 (SrcVT == MVT::i32 || (SrcVT == MVT::i64 && Subtarget->is64Bit()))) {
12796 // Conversions from unsigned i32 to f32/f64 are legal,
12797 // using VCVTUSI2SS/SD. Same for i64 in 64-bit mode.
12801 if (SrcVT == MVT::i64 && DstVT == MVT::f64 && X86ScalarSSEf64)
12802 return LowerUINT_TO_FP_i64(Op, DAG);
12803 if (SrcVT == MVT::i32 && X86ScalarSSEf64)
12804 return LowerUINT_TO_FP_i32(Op, DAG);
12805 if (Subtarget->is64Bit() && SrcVT == MVT::i64 && DstVT == MVT::f32)
12808 // Make a 64-bit buffer, and use it to build an FILD.
12809 SDValue StackSlot = DAG.CreateStackTemporary(MVT::i64);
12810 if (SrcVT == MVT::i32) {
12811 SDValue WordOff = DAG.getConstant(4, dl, PtrVT);
12812 SDValue OffsetSlot = DAG.getNode(ISD::ADD, dl, PtrVT, StackSlot, WordOff);
12813 SDValue Store1 = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
12814 StackSlot, MachinePointerInfo(),
12816 SDValue Store2 = DAG.getStore(Store1, dl, DAG.getConstant(0, dl, MVT::i32),
12817 OffsetSlot, MachinePointerInfo(),
12819 SDValue Fild = BuildFILD(Op, MVT::i64, Store2, StackSlot, DAG);
12823 assert(SrcVT == MVT::i64 && "Unexpected type in UINT_TO_FP");
12824 SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
12825 StackSlot, MachinePointerInfo(),
12827 // For i64 source, we need to add the appropriate power of 2 if the input
12828 // was negative. This is the same as the optimization in
12829 // DAGTypeLegalizer::ExpandIntOp_UNIT_TO_FP, and for it to be safe here,
12830 // we must be careful to do the computation in x87 extended precision, not
12831 // in SSE. (The generic code can't know it's OK to do this, or how to.)
12832 int SSFI = cast<FrameIndexSDNode>(StackSlot)->getIndex();
12833 MachineMemOperand *MMO = DAG.getMachineFunction().getMachineMemOperand(
12834 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SSFI),
12835 MachineMemOperand::MOLoad, 8, 8);
12837 SDVTList Tys = DAG.getVTList(MVT::f80, MVT::Other);
12838 SDValue Ops[] = { Store, StackSlot, DAG.getValueType(MVT::i64) };
12839 SDValue Fild = DAG.getMemIntrinsicNode(X86ISD::FILD, dl, Tys, Ops,
12842 APInt FF(32, 0x5F800000ULL);
12844 // Check whether the sign bit is set.
12845 SDValue SignSet = DAG.getSetCC(
12846 dl, getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), MVT::i64),
12847 Op.getOperand(0), DAG.getConstant(0, dl, MVT::i64), ISD::SETLT);
12849 // Build a 64 bit pair (0, FF) in the constant pool, with FF in the lo bits.
12850 SDValue FudgePtr = DAG.getConstantPool(
12851 ConstantInt::get(*DAG.getContext(), FF.zext(64)), PtrVT);
12853 // Get a pointer to FF if the sign bit was set, or to 0 otherwise.
12854 SDValue Zero = DAG.getIntPtrConstant(0, dl);
12855 SDValue Four = DAG.getIntPtrConstant(4, dl);
12856 SDValue Offset = DAG.getNode(ISD::SELECT, dl, Zero.getValueType(), SignSet,
12858 FudgePtr = DAG.getNode(ISD::ADD, dl, PtrVT, FudgePtr, Offset);
12860 // Load the value out, extending it from f32 to f80.
12861 // FIXME: Avoid the extend by constructing the right constant pool?
12862 SDValue Fudge = DAG.getExtLoad(
12863 ISD::EXTLOAD, dl, MVT::f80, DAG.getEntryNode(), FudgePtr,
12864 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()), MVT::f32,
12865 false, false, false, 4);
12866 // Extend everything to 80 bits to force it to be done on x87.
12867 // TODO: Are there any fast-math-flags to propagate here?
12868 SDValue Add = DAG.getNode(ISD::FADD, dl, MVT::f80, Fild, Fudge);
12869 return DAG.getNode(ISD::FP_ROUND, dl, DstVT, Add,
12870 DAG.getIntPtrConstant(0, dl));
12873 // If the given FP_TO_SINT (IsSigned) or FP_TO_UINT (!IsSigned) operation
12874 // is legal, or has an fp128 or f16 source (which needs to be promoted to f32),
12875 // just return an <SDValue(), SDValue()> pair.
12876 // Otherwise it is assumed to be a conversion from one of f32, f64 or f80
12877 // to i16, i32 or i64, and we lower it to a legal sequence.
12878 // If lowered to the final integer result we return a <result, SDValue()> pair.
12879 // Otherwise we lower it to a sequence ending with a FIST, return a
12880 // <FIST, StackSlot> pair, and the caller is responsible for loading
12881 // the final integer result from StackSlot.
12882 std::pair<SDValue,SDValue>
12883 X86TargetLowering::FP_TO_INTHelper(SDValue Op, SelectionDAG &DAG,
12884 bool IsSigned, bool IsReplace) const {
12887 EVT DstTy = Op.getValueType();
12888 EVT TheVT = Op.getOperand(0).getValueType();
12889 auto PtrVT = getPointerTy(DAG.getDataLayout());
12891 if (TheVT != MVT::f32 && TheVT != MVT::f64 && TheVT != MVT::f80) {
12892 // f16 must be promoted before using the lowering in this routine.
12893 // fp128 does not use this lowering.
12894 return std::make_pair(SDValue(), SDValue());
12897 // If using FIST to compute an unsigned i64, we'll need some fixup
12898 // to handle values above the maximum signed i64. A FIST is always
12899 // used for the 32-bit subtarget, but also for f80 on a 64-bit target.
12900 bool UnsignedFixup = !IsSigned &&
12901 DstTy == MVT::i64 &&
12902 (!Subtarget->is64Bit() ||
12903 !isScalarFPTypeInSSEReg(TheVT));
12905 if (!IsSigned && DstTy != MVT::i64 && !Subtarget->hasAVX512()) {
12906 // Replace the fp-to-uint32 operation with an fp-to-sint64 FIST.
12907 // The low 32 bits of the fist result will have the correct uint32 result.
12908 assert(DstTy == MVT::i32 && "Unexpected FP_TO_UINT");
12912 assert(DstTy.getSimpleVT() <= MVT::i64 &&
12913 DstTy.getSimpleVT() >= MVT::i16 &&
12914 "Unknown FP_TO_INT to lower!");
12916 // These are really Legal.
12917 if (DstTy == MVT::i32 &&
12918 isScalarFPTypeInSSEReg(Op.getOperand(0).getValueType()))
12919 return std::make_pair(SDValue(), SDValue());
12920 if (Subtarget->is64Bit() &&
12921 DstTy == MVT::i64 &&
12922 isScalarFPTypeInSSEReg(Op.getOperand(0).getValueType()))
12923 return std::make_pair(SDValue(), SDValue());
12925 // We lower FP->int64 into FISTP64 followed by a load from a temporary
12927 MachineFunction &MF = DAG.getMachineFunction();
12928 unsigned MemSize = DstTy.getSizeInBits()/8;
12929 int SSFI = MF.getFrameInfo()->CreateStackObject(MemSize, MemSize, false);
12930 SDValue StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
12933 switch (DstTy.getSimpleVT().SimpleTy) {
12934 default: llvm_unreachable("Invalid FP_TO_SINT to lower!");
12935 case MVT::i16: Opc = X86ISD::FP_TO_INT16_IN_MEM; break;
12936 case MVT::i32: Opc = X86ISD::FP_TO_INT32_IN_MEM; break;
12937 case MVT::i64: Opc = X86ISD::FP_TO_INT64_IN_MEM; break;
12940 SDValue Chain = DAG.getEntryNode();
12941 SDValue Value = Op.getOperand(0);
12942 SDValue Adjust; // 0x0 or 0x80000000, for result sign bit adjustment.
12944 if (UnsignedFixup) {
12946 // Conversion to unsigned i64 is implemented with a select,
12947 // depending on whether the source value fits in the range
12948 // of a signed i64. Let Thresh be the FP equivalent of
12949 // 0x8000000000000000ULL.
12951 // Adjust i32 = (Value < Thresh) ? 0 : 0x80000000;
12952 // FistSrc = (Value < Thresh) ? Value : (Value - Thresh);
12953 // Fist-to-mem64 FistSrc
12954 // Add 0 or 0x800...0ULL to the 64-bit result, which is equivalent
12955 // to XOR'ing the high 32 bits with Adjust.
12957 // Being a power of 2, Thresh is exactly representable in all FP formats.
12958 // For X87 we'd like to use the smallest FP type for this constant, but
12959 // for DAG type consistency we have to match the FP operand type.
12961 APFloat Thresh(APFloat::IEEEsingle, APInt(32, 0x5f000000));
12962 LLVM_ATTRIBUTE_UNUSED APFloat::opStatus Status = APFloat::opOK;
12963 bool LosesInfo = false;
12964 if (TheVT == MVT::f64)
12965 // The rounding mode is irrelevant as the conversion should be exact.
12966 Status = Thresh.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven,
12968 else if (TheVT == MVT::f80)
12969 Status = Thresh.convert(APFloat::x87DoubleExtended,
12970 APFloat::rmNearestTiesToEven, &LosesInfo);
12972 assert(Status == APFloat::opOK && !LosesInfo &&
12973 "FP conversion should have been exact");
12975 SDValue ThreshVal = DAG.getConstantFP(Thresh, DL, TheVT);
12977 SDValue Cmp = DAG.getSetCC(DL,
12978 getSetCCResultType(DAG.getDataLayout(),
12979 *DAG.getContext(), TheVT),
12980 Value, ThreshVal, ISD::SETLT);
12981 Adjust = DAG.getSelect(DL, MVT::i32, Cmp,
12982 DAG.getConstant(0, DL, MVT::i32),
12983 DAG.getConstant(0x80000000, DL, MVT::i32));
12984 SDValue Sub = DAG.getNode(ISD::FSUB, DL, TheVT, Value, ThreshVal);
12985 Cmp = DAG.getSetCC(DL, getSetCCResultType(DAG.getDataLayout(),
12986 *DAG.getContext(), TheVT),
12987 Value, ThreshVal, ISD::SETLT);
12988 Value = DAG.getSelect(DL, TheVT, Cmp, Value, Sub);
12991 // FIXME This causes a redundant load/store if the SSE-class value is already
12992 // in memory, such as if it is on the callstack.
12993 if (isScalarFPTypeInSSEReg(TheVT)) {
12994 assert(DstTy == MVT::i64 && "Invalid FP_TO_SINT to lower!");
12995 Chain = DAG.getStore(Chain, DL, Value, StackSlot,
12996 MachinePointerInfo::getFixedStack(MF, SSFI), false,
12998 SDVTList Tys = DAG.getVTList(Op.getOperand(0).getValueType(), MVT::Other);
13000 Chain, StackSlot, DAG.getValueType(TheVT)
13003 MachineMemOperand *MMO =
13004 MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(MF, SSFI),
13005 MachineMemOperand::MOLoad, MemSize, MemSize);
13006 Value = DAG.getMemIntrinsicNode(X86ISD::FLD, DL, Tys, Ops, DstTy, MMO);
13007 Chain = Value.getValue(1);
13008 SSFI = MF.getFrameInfo()->CreateStackObject(MemSize, MemSize, false);
13009 StackSlot = DAG.getFrameIndex(SSFI, PtrVT);
13012 MachineMemOperand *MMO =
13013 MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(MF, SSFI),
13014 MachineMemOperand::MOStore, MemSize, MemSize);
13016 if (UnsignedFixup) {
13018 // Insert the FIST, load its result as two i32's,
13019 // and XOR the high i32 with Adjust.
13021 SDValue FistOps[] = { Chain, Value, StackSlot };
13022 SDValue FIST = DAG.getMemIntrinsicNode(Opc, DL, DAG.getVTList(MVT::Other),
13023 FistOps, DstTy, MMO);
13025 SDValue Low32 = DAG.getLoad(MVT::i32, DL, FIST, StackSlot,
13026 MachinePointerInfo(),
13027 false, false, false, 0);
13028 SDValue HighAddr = DAG.getNode(ISD::ADD, DL, PtrVT, StackSlot,
13029 DAG.getConstant(4, DL, PtrVT));
13031 SDValue High32 = DAG.getLoad(MVT::i32, DL, FIST, HighAddr,
13032 MachinePointerInfo(),
13033 false, false, false, 0);
13034 High32 = DAG.getNode(ISD::XOR, DL, MVT::i32, High32, Adjust);
13036 if (Subtarget->is64Bit()) {
13037 // Join High32 and Low32 into a 64-bit result.
13038 // (High32 << 32) | Low32
13039 Low32 = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, Low32);
13040 High32 = DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i64, High32);
13041 High32 = DAG.getNode(ISD::SHL, DL, MVT::i64, High32,
13042 DAG.getConstant(32, DL, MVT::i8));
13043 SDValue Result = DAG.getNode(ISD::OR, DL, MVT::i64, High32, Low32);
13044 return std::make_pair(Result, SDValue());
13047 SDValue ResultOps[] = { Low32, High32 };
13049 SDValue pair = IsReplace
13050 ? DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, ResultOps)
13051 : DAG.getMergeValues(ResultOps, DL);
13052 return std::make_pair(pair, SDValue());
13054 // Build the FP_TO_INT*_IN_MEM
13055 SDValue Ops[] = { Chain, Value, StackSlot };
13056 SDValue FIST = DAG.getMemIntrinsicNode(Opc, DL, DAG.getVTList(MVT::Other),
13058 return std::make_pair(FIST, StackSlot);
13062 static SDValue LowerAVXExtend(SDValue Op, SelectionDAG &DAG,
13063 const X86Subtarget *Subtarget) {
13064 MVT VT = Op->getSimpleValueType(0);
13065 SDValue In = Op->getOperand(0);
13066 MVT InVT = In.getSimpleValueType();
13069 if (VT.is512BitVector() || InVT.getVectorElementType() == MVT::i1)
13070 return DAG.getNode(ISD::ZERO_EXTEND, dl, VT, In);
13072 // Optimize vectors in AVX mode:
13075 // Use vpunpcklwd for 4 lower elements v8i16 -> v4i32.
13076 // Use vpunpckhwd for 4 upper elements v8i16 -> v4i32.
13077 // Concat upper and lower parts.
13080 // Use vpunpckldq for 4 lower elements v4i32 -> v2i64.
13081 // Use vpunpckhdq for 4 upper elements v4i32 -> v2i64.
13082 // Concat upper and lower parts.
13085 if (((VT != MVT::v16i16) || (InVT != MVT::v16i8)) &&
13086 ((VT != MVT::v8i32) || (InVT != MVT::v8i16)) &&
13087 ((VT != MVT::v4i64) || (InVT != MVT::v4i32)))
13090 if (Subtarget->hasInt256())
13091 return DAG.getNode(X86ISD::VZEXT, dl, VT, In);
13093 SDValue ZeroVec = getZeroVector(InVT, Subtarget, DAG, dl);
13094 SDValue Undef = DAG.getUNDEF(InVT);
13095 bool NeedZero = Op.getOpcode() == ISD::ZERO_EXTEND;
13096 SDValue OpLo = getUnpackl(DAG, dl, InVT, In, NeedZero ? ZeroVec : Undef);
13097 SDValue OpHi = getUnpackh(DAG, dl, InVT, In, NeedZero ? ZeroVec : Undef);
13099 MVT HVT = MVT::getVectorVT(VT.getVectorElementType(),
13100 VT.getVectorNumElements()/2);
13102 OpLo = DAG.getBitcast(HVT, OpLo);
13103 OpHi = DAG.getBitcast(HVT, OpHi);
13105 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, OpLo, OpHi);
13108 static SDValue LowerZERO_EXTEND_AVX512(SDValue Op,
13109 const X86Subtarget *Subtarget, SelectionDAG &DAG) {
13110 MVT VT = Op->getSimpleValueType(0);
13111 SDValue In = Op->getOperand(0);
13112 MVT InVT = In.getSimpleValueType();
13114 unsigned int NumElts = VT.getVectorNumElements();
13115 if (NumElts != 8 && NumElts != 16 && !Subtarget->hasBWI())
13118 if (VT.is512BitVector() && InVT.getVectorElementType() != MVT::i1)
13119 return DAG.getNode(X86ISD::VZEXT, DL, VT, In);
13121 assert(InVT.getVectorElementType() == MVT::i1);
13122 MVT ExtVT = NumElts == 8 ? MVT::v8i64 : MVT::v16i32;
13124 DAG.getConstant(APInt(ExtVT.getScalarSizeInBits(), 1), DL, ExtVT);
13126 DAG.getConstant(APInt::getNullValue(ExtVT.getScalarSizeInBits()), DL, ExtVT);
13128 SDValue V = DAG.getNode(ISD::VSELECT, DL, ExtVT, In, One, Zero);
13129 if (VT.is512BitVector())
13131 return DAG.getNode(X86ISD::VTRUNC, DL, VT, V);
13134 static SDValue LowerANY_EXTEND(SDValue Op, const X86Subtarget *Subtarget,
13135 SelectionDAG &DAG) {
13136 if (Subtarget->hasFp256())
13137 if (SDValue Res = LowerAVXExtend(Op, DAG, Subtarget))
13143 static SDValue LowerZERO_EXTEND(SDValue Op, const X86Subtarget *Subtarget,
13144 SelectionDAG &DAG) {
13146 MVT VT = Op.getSimpleValueType();
13147 SDValue In = Op.getOperand(0);
13148 MVT SVT = In.getSimpleValueType();
13150 if (VT.is512BitVector() || SVT.getVectorElementType() == MVT::i1)
13151 return LowerZERO_EXTEND_AVX512(Op, Subtarget, DAG);
13153 if (Subtarget->hasFp256())
13154 if (SDValue Res = LowerAVXExtend(Op, DAG, Subtarget))
13157 assert(!VT.is256BitVector() || !SVT.is128BitVector() ||
13158 VT.getVectorNumElements() != SVT.getVectorNumElements());
13162 SDValue X86TargetLowering::LowerTRUNCATE(SDValue Op, SelectionDAG &DAG) const {
13164 MVT VT = Op.getSimpleValueType();
13165 SDValue In = Op.getOperand(0);
13166 MVT InVT = In.getSimpleValueType();
13168 if (VT == MVT::i1) {
13169 assert((InVT.isInteger() && (InVT.getSizeInBits() <= 64)) &&
13170 "Invalid scalar TRUNCATE operation");
13171 if (InVT.getSizeInBits() >= 32)
13173 In = DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i32, In);
13174 return DAG.getNode(ISD::TRUNCATE, DL, VT, In);
13176 assert(VT.getVectorNumElements() == InVT.getVectorNumElements() &&
13177 "Invalid TRUNCATE operation");
13179 // move vector to mask - truncate solution for SKX
13180 if (VT.getVectorElementType() == MVT::i1) {
13181 if (InVT.is512BitVector() && InVT.getScalarSizeInBits() <= 16 &&
13182 Subtarget->hasBWI())
13183 return Op; // legal, will go to VPMOVB2M, VPMOVW2M
13184 if ((InVT.is256BitVector() || InVT.is128BitVector())
13185 && InVT.getScalarSizeInBits() <= 16 &&
13186 Subtarget->hasBWI() && Subtarget->hasVLX())
13187 return Op; // legal, will go to VPMOVB2M, VPMOVW2M
13188 if (InVT.is512BitVector() && InVT.getScalarSizeInBits() >= 32 &&
13189 Subtarget->hasDQI())
13190 return Op; // legal, will go to VPMOVD2M, VPMOVQ2M
13191 if ((InVT.is256BitVector() || InVT.is128BitVector())
13192 && InVT.getScalarSizeInBits() >= 32 &&
13193 Subtarget->hasDQI() && Subtarget->hasVLX())
13194 return Op; // legal, will go to VPMOVB2M, VPMOVQ2M
13197 if (VT.getVectorElementType() == MVT::i1) {
13198 assert(VT.getVectorElementType() == MVT::i1 && "Unexpected vector type");
13199 unsigned NumElts = InVT.getVectorNumElements();
13200 assert ((NumElts == 8 || NumElts == 16) && "Unexpected vector type");
13201 if (InVT.getSizeInBits() < 512) {
13202 MVT ExtVT = (NumElts == 16)? MVT::v16i32 : MVT::v8i64;
13203 In = DAG.getNode(ISD::SIGN_EXTEND, DL, ExtVT, In);
13208 DAG.getConstant(APInt::getSignBit(InVT.getScalarSizeInBits()), DL, InVT);
13209 SDValue And = DAG.getNode(ISD::AND, DL, InVT, OneV, In);
13210 return DAG.getNode(X86ISD::TESTM, DL, VT, And, And);
13213 // vpmovqb/w/d, vpmovdb/w, vpmovwb
13214 if (Subtarget->hasAVX512()) {
13215 // word to byte only under BWI
13216 if (InVT == MVT::v16i16 && !Subtarget->hasBWI()) // v16i16 -> v16i8
13217 return DAG.getNode(X86ISD::VTRUNC, DL, VT,
13218 DAG.getNode(X86ISD::VSEXT, DL, MVT::v16i32, In));
13219 return DAG.getNode(X86ISD::VTRUNC, DL, VT, In);
13221 if ((VT == MVT::v4i32) && (InVT == MVT::v4i64)) {
13222 // On AVX2, v4i64 -> v4i32 becomes VPERMD.
13223 if (Subtarget->hasInt256()) {
13224 static const int ShufMask[] = {0, 2, 4, 6, -1, -1, -1, -1};
13225 In = DAG.getBitcast(MVT::v8i32, In);
13226 In = DAG.getVectorShuffle(MVT::v8i32, DL, In, DAG.getUNDEF(MVT::v8i32),
13228 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, In,
13229 DAG.getIntPtrConstant(0, DL));
13232 SDValue OpLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v2i64, In,
13233 DAG.getIntPtrConstant(0, DL));
13234 SDValue OpHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v2i64, In,
13235 DAG.getIntPtrConstant(2, DL));
13236 OpLo = DAG.getBitcast(MVT::v4i32, OpLo);
13237 OpHi = DAG.getBitcast(MVT::v4i32, OpHi);
13238 static const int ShufMask[] = {0, 2, 4, 6};
13239 return DAG.getVectorShuffle(VT, DL, OpLo, OpHi, ShufMask);
13242 if ((VT == MVT::v8i16) && (InVT == MVT::v8i32)) {
13243 // On AVX2, v8i32 -> v8i16 becomed PSHUFB.
13244 if (Subtarget->hasInt256()) {
13245 In = DAG.getBitcast(MVT::v32i8, In);
13247 SmallVector<SDValue,32> pshufbMask;
13248 for (unsigned i = 0; i < 2; ++i) {
13249 pshufbMask.push_back(DAG.getConstant(0x0, DL, MVT::i8));
13250 pshufbMask.push_back(DAG.getConstant(0x1, DL, MVT::i8));
13251 pshufbMask.push_back(DAG.getConstant(0x4, DL, MVT::i8));
13252 pshufbMask.push_back(DAG.getConstant(0x5, DL, MVT::i8));
13253 pshufbMask.push_back(DAG.getConstant(0x8, DL, MVT::i8));
13254 pshufbMask.push_back(DAG.getConstant(0x9, DL, MVT::i8));
13255 pshufbMask.push_back(DAG.getConstant(0xc, DL, MVT::i8));
13256 pshufbMask.push_back(DAG.getConstant(0xd, DL, MVT::i8));
13257 for (unsigned j = 0; j < 8; ++j)
13258 pshufbMask.push_back(DAG.getConstant(0x80, DL, MVT::i8));
13260 SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, DL, MVT::v32i8, pshufbMask);
13261 In = DAG.getNode(X86ISD::PSHUFB, DL, MVT::v32i8, In, BV);
13262 In = DAG.getBitcast(MVT::v4i64, In);
13264 static const int ShufMask[] = {0, 2, -1, -1};
13265 In = DAG.getVectorShuffle(MVT::v4i64, DL, In, DAG.getUNDEF(MVT::v4i64),
13267 In = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v2i64, In,
13268 DAG.getIntPtrConstant(0, DL));
13269 return DAG.getBitcast(VT, In);
13272 SDValue OpLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v4i32, In,
13273 DAG.getIntPtrConstant(0, DL));
13275 SDValue OpHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, MVT::v4i32, In,
13276 DAG.getIntPtrConstant(4, DL));
13278 OpLo = DAG.getBitcast(MVT::v16i8, OpLo);
13279 OpHi = DAG.getBitcast(MVT::v16i8, OpHi);
13281 // The PSHUFB mask:
13282 static const int ShufMask1[] = {0, 1, 4, 5, 8, 9, 12, 13,
13283 -1, -1, -1, -1, -1, -1, -1, -1};
13285 SDValue Undef = DAG.getUNDEF(MVT::v16i8);
13286 OpLo = DAG.getVectorShuffle(MVT::v16i8, DL, OpLo, Undef, ShufMask1);
13287 OpHi = DAG.getVectorShuffle(MVT::v16i8, DL, OpHi, Undef, ShufMask1);
13289 OpLo = DAG.getBitcast(MVT::v4i32, OpLo);
13290 OpHi = DAG.getBitcast(MVT::v4i32, OpHi);
13292 // The MOVLHPS Mask:
13293 static const int ShufMask2[] = {0, 1, 4, 5};
13294 SDValue res = DAG.getVectorShuffle(MVT::v4i32, DL, OpLo, OpHi, ShufMask2);
13295 return DAG.getBitcast(MVT::v8i16, res);
13298 // Handle truncation of V256 to V128 using shuffles.
13299 if (!VT.is128BitVector() || !InVT.is256BitVector())
13302 assert(Subtarget->hasFp256() && "256-bit vector without AVX!");
13304 unsigned NumElems = VT.getVectorNumElements();
13305 MVT NVT = MVT::getVectorVT(VT.getVectorElementType(), NumElems * 2);
13307 SmallVector<int, 16> MaskVec(NumElems * 2, -1);
13308 // Prepare truncation shuffle mask
13309 for (unsigned i = 0; i != NumElems; ++i)
13310 MaskVec[i] = i * 2;
13311 SDValue V = DAG.getVectorShuffle(NVT, DL, DAG.getBitcast(NVT, In),
13312 DAG.getUNDEF(NVT), &MaskVec[0]);
13313 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, V,
13314 DAG.getIntPtrConstant(0, DL));
13317 SDValue X86TargetLowering::LowerFP_TO_SINT(SDValue Op,
13318 SelectionDAG &DAG) const {
13319 assert(!Op.getSimpleValueType().isVector());
13321 std::pair<SDValue,SDValue> Vals = FP_TO_INTHelper(Op, DAG,
13322 /*IsSigned=*/ true, /*IsReplace=*/ false);
13323 SDValue FIST = Vals.first, StackSlot = Vals.second;
13324 // If FP_TO_INTHelper failed, the node is actually supposed to be Legal.
13325 if (!FIST.getNode())
13328 if (StackSlot.getNode())
13329 // Load the result.
13330 return DAG.getLoad(Op.getValueType(), SDLoc(Op),
13331 FIST, StackSlot, MachinePointerInfo(),
13332 false, false, false, 0);
13334 // The node is the result.
13338 SDValue X86TargetLowering::LowerFP_TO_UINT(SDValue Op,
13339 SelectionDAG &DAG) const {
13340 std::pair<SDValue,SDValue> Vals = FP_TO_INTHelper(Op, DAG,
13341 /*IsSigned=*/ false, /*IsReplace=*/ false);
13342 SDValue FIST = Vals.first, StackSlot = Vals.second;
13343 // If FP_TO_INTHelper failed, the node is actually supposed to be Legal.
13344 if (!FIST.getNode())
13347 if (StackSlot.getNode())
13348 // Load the result.
13349 return DAG.getLoad(Op.getValueType(), SDLoc(Op),
13350 FIST, StackSlot, MachinePointerInfo(),
13351 false, false, false, 0);
13353 // The node is the result.
13357 static SDValue LowerFP_EXTEND(SDValue Op, SelectionDAG &DAG) {
13359 MVT VT = Op.getSimpleValueType();
13360 SDValue In = Op.getOperand(0);
13361 MVT SVT = In.getSimpleValueType();
13363 assert(SVT == MVT::v2f32 && "Only customize MVT::v2f32 type legalization!");
13365 return DAG.getNode(X86ISD::VFPEXT, DL, VT,
13366 DAG.getNode(ISD::CONCAT_VECTORS, DL, MVT::v4f32,
13367 In, DAG.getUNDEF(SVT)));
13370 /// The only differences between FABS and FNEG are the mask and the logic op.
13371 /// FNEG also has a folding opportunity for FNEG(FABS(x)).
13372 static SDValue LowerFABSorFNEG(SDValue Op, SelectionDAG &DAG) {
13373 assert((Op.getOpcode() == ISD::FABS || Op.getOpcode() == ISD::FNEG) &&
13374 "Wrong opcode for lowering FABS or FNEG.");
13376 bool IsFABS = (Op.getOpcode() == ISD::FABS);
13378 // If this is a FABS and it has an FNEG user, bail out to fold the combination
13379 // into an FNABS. We'll lower the FABS after that if it is still in use.
13381 for (SDNode *User : Op->uses())
13382 if (User->getOpcode() == ISD::FNEG)
13386 MVT VT = Op.getSimpleValueType();
13388 // FIXME: Use function attribute "OptimizeForSize" and/or CodeGenOpt::Level to
13389 // decide if we should generate a 16-byte constant mask when we only need 4 or
13390 // 8 bytes for the scalar case.
13396 if (VT.isVector()) {
13398 EltVT = VT.getVectorElementType();
13399 NumElts = VT.getVectorNumElements();
13401 // There are no scalar bitwise logical SSE/AVX instructions, so we
13402 // generate a 16-byte vector constant and logic op even for the scalar case.
13403 // Using a 16-byte mask allows folding the load of the mask with
13404 // the logic op, so it can save (~4 bytes) on code size.
13405 LogicVT = (VT == MVT::f64) ? MVT::v2f64 : MVT::v4f32;
13407 NumElts = (VT == MVT::f64) ? 2 : 4;
13410 unsigned EltBits = EltVT.getSizeInBits();
13411 LLVMContext *Context = DAG.getContext();
13412 // For FABS, mask is 0x7f...; for FNEG, mask is 0x80...
13414 IsFABS ? APInt::getSignedMaxValue(EltBits) : APInt::getSignBit(EltBits);
13415 Constant *C = ConstantInt::get(*Context, MaskElt);
13416 C = ConstantVector::getSplat(NumElts, C);
13417 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
13418 SDValue CPIdx = DAG.getConstantPool(C, TLI.getPointerTy(DAG.getDataLayout()));
13419 unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
13421 DAG.getLoad(LogicVT, dl, DAG.getEntryNode(), CPIdx,
13422 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
13423 false, false, false, Alignment);
13425 SDValue Op0 = Op.getOperand(0);
13426 bool IsFNABS = !IsFABS && (Op0.getOpcode() == ISD::FABS);
13428 IsFABS ? X86ISD::FAND : IsFNABS ? X86ISD::FOR : X86ISD::FXOR;
13429 SDValue Operand = IsFNABS ? Op0.getOperand(0) : Op0;
13432 return DAG.getNode(LogicOp, dl, LogicVT, Operand, Mask);
13434 // For the scalar case extend to a 128-bit vector, perform the logic op,
13435 // and extract the scalar result back out.
13436 Operand = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, LogicVT, Operand);
13437 SDValue LogicNode = DAG.getNode(LogicOp, dl, LogicVT, Operand, Mask);
13438 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, VT, LogicNode,
13439 DAG.getIntPtrConstant(0, dl));
13442 static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
13443 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
13444 LLVMContext *Context = DAG.getContext();
13445 SDValue Op0 = Op.getOperand(0);
13446 SDValue Op1 = Op.getOperand(1);
13448 MVT VT = Op.getSimpleValueType();
13449 MVT SrcVT = Op1.getSimpleValueType();
13451 // If second operand is smaller, extend it first.
13452 if (SrcVT.bitsLT(VT)) {
13453 Op1 = DAG.getNode(ISD::FP_EXTEND, dl, VT, Op1);
13456 // And if it is bigger, shrink it first.
13457 if (SrcVT.bitsGT(VT)) {
13458 Op1 = DAG.getNode(ISD::FP_ROUND, dl, VT, Op1, DAG.getIntPtrConstant(1, dl));
13462 // At this point the operands and the result should have the same
13463 // type, and that won't be f80 since that is not custom lowered.
13465 const fltSemantics &Sem =
13466 VT == MVT::f64 ? APFloat::IEEEdouble : APFloat::IEEEsingle;
13467 const unsigned SizeInBits = VT.getSizeInBits();
13469 SmallVector<Constant *, 4> CV(
13470 VT == MVT::f64 ? 2 : 4,
13471 ConstantFP::get(*Context, APFloat(Sem, APInt(SizeInBits, 0))));
13473 // First, clear all bits but the sign bit from the second operand (sign).
13474 CV[0] = ConstantFP::get(*Context,
13475 APFloat(Sem, APInt::getHighBitsSet(SizeInBits, 1)));
13476 Constant *C = ConstantVector::get(CV);
13477 auto PtrVT = TLI.getPointerTy(DAG.getDataLayout());
13478 SDValue CPIdx = DAG.getConstantPool(C, PtrVT, 16);
13480 // Perform all logic operations as 16-byte vectors because there are no
13481 // scalar FP logic instructions in SSE. This allows load folding of the
13482 // constants into the logic instructions.
13483 MVT LogicVT = (VT == MVT::f64) ? MVT::v2f64 : MVT::v4f32;
13485 DAG.getLoad(LogicVT, dl, DAG.getEntryNode(), CPIdx,
13486 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
13487 false, false, false, 16);
13488 Op1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, LogicVT, Op1);
13489 SDValue SignBit = DAG.getNode(X86ISD::FAND, dl, LogicVT, Op1, Mask1);
13491 // Next, clear the sign bit from the first operand (magnitude).
13492 // If it's a constant, we can clear it here.
13493 if (ConstantFPSDNode *Op0CN = dyn_cast<ConstantFPSDNode>(Op0)) {
13494 APFloat APF = Op0CN->getValueAPF();
13495 // If the magnitude is a positive zero, the sign bit alone is enough.
13496 if (APF.isPosZero())
13497 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SrcVT, SignBit,
13498 DAG.getIntPtrConstant(0, dl));
13500 CV[0] = ConstantFP::get(*Context, APF);
13502 CV[0] = ConstantFP::get(
13504 APFloat(Sem, APInt::getLowBitsSet(SizeInBits, SizeInBits - 1)));
13506 C = ConstantVector::get(CV);
13507 CPIdx = DAG.getConstantPool(C, PtrVT, 16);
13509 DAG.getLoad(LogicVT, dl, DAG.getEntryNode(), CPIdx,
13510 MachinePointerInfo::getConstantPool(DAG.getMachineFunction()),
13511 false, false, false, 16);
13512 // If the magnitude operand wasn't a constant, we need to AND out the sign.
13513 if (!isa<ConstantFPSDNode>(Op0)) {
13514 Op0 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, LogicVT, Op0);
13515 Val = DAG.getNode(X86ISD::FAND, dl, LogicVT, Op0, Val);
13517 // OR the magnitude value with the sign bit.
13518 Val = DAG.getNode(X86ISD::FOR, dl, LogicVT, Val, SignBit);
13519 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SrcVT, Val,
13520 DAG.getIntPtrConstant(0, dl));
13523 static SDValue LowerFGETSIGN(SDValue Op, SelectionDAG &DAG) {
13524 SDValue N0 = Op.getOperand(0);
13526 MVT VT = Op.getSimpleValueType();
13528 // Lower ISD::FGETSIGN to (AND (X86ISD::FGETSIGNx86 ...) 1).
13529 SDValue xFGETSIGN = DAG.getNode(X86ISD::FGETSIGNx86, dl, VT, N0,
13530 DAG.getConstant(1, dl, VT));
13531 return DAG.getNode(ISD::AND, dl, VT, xFGETSIGN, DAG.getConstant(1, dl, VT));
13534 // Check whether an OR'd tree is PTEST-able.
13535 static SDValue LowerVectorAllZeroTest(SDValue Op, const X86Subtarget *Subtarget,
13536 SelectionDAG &DAG) {
13537 assert(Op.getOpcode() == ISD::OR && "Only check OR'd tree.");
13539 if (!Subtarget->hasSSE41())
13542 if (!Op->hasOneUse())
13545 SDNode *N = Op.getNode();
13548 SmallVector<SDValue, 8> Opnds;
13549 DenseMap<SDValue, unsigned> VecInMap;
13550 SmallVector<SDValue, 8> VecIns;
13551 EVT VT = MVT::Other;
13553 // Recognize a special case where a vector is casted into wide integer to
13555 Opnds.push_back(N->getOperand(0));
13556 Opnds.push_back(N->getOperand(1));
13558 for (unsigned Slot = 0, e = Opnds.size(); Slot < e; ++Slot) {
13559 SmallVectorImpl<SDValue>::const_iterator I = Opnds.begin() + Slot;
13560 // BFS traverse all OR'd operands.
13561 if (I->getOpcode() == ISD::OR) {
13562 Opnds.push_back(I->getOperand(0));
13563 Opnds.push_back(I->getOperand(1));
13564 // Re-evaluate the number of nodes to be traversed.
13565 e += 2; // 2 more nodes (LHS and RHS) are pushed.
13569 // Quit if a non-EXTRACT_VECTOR_ELT
13570 if (I->getOpcode() != ISD::EXTRACT_VECTOR_ELT)
13573 // Quit if without a constant index.
13574 SDValue Idx = I->getOperand(1);
13575 if (!isa<ConstantSDNode>(Idx))
13578 SDValue ExtractedFromVec = I->getOperand(0);
13579 DenseMap<SDValue, unsigned>::iterator M = VecInMap.find(ExtractedFromVec);
13580 if (M == VecInMap.end()) {
13581 VT = ExtractedFromVec.getValueType();
13582 // Quit if not 128/256-bit vector.
13583 if (!VT.is128BitVector() && !VT.is256BitVector())
13585 // Quit if not the same type.
13586 if (VecInMap.begin() != VecInMap.end() &&
13587 VT != VecInMap.begin()->first.getValueType())
13589 M = VecInMap.insert(std::make_pair(ExtractedFromVec, 0)).first;
13590 VecIns.push_back(ExtractedFromVec);
13592 M->second |= 1U << cast<ConstantSDNode>(Idx)->getZExtValue();
13595 assert((VT.is128BitVector() || VT.is256BitVector()) &&
13596 "Not extracted from 128-/256-bit vector.");
13598 unsigned FullMask = (1U << VT.getVectorNumElements()) - 1U;
13600 for (DenseMap<SDValue, unsigned>::const_iterator
13601 I = VecInMap.begin(), E = VecInMap.end(); I != E; ++I) {
13602 // Quit if not all elements are used.
13603 if (I->second != FullMask)
13607 MVT TestVT = VT.is128BitVector() ? MVT::v2i64 : MVT::v4i64;
13609 // Cast all vectors into TestVT for PTEST.
13610 for (unsigned i = 0, e = VecIns.size(); i < e; ++i)
13611 VecIns[i] = DAG.getBitcast(TestVT, VecIns[i]);
13613 // If more than one full vectors are evaluated, OR them first before PTEST.
13614 for (unsigned Slot = 0, e = VecIns.size(); e - Slot > 1; Slot += 2, e += 1) {
13615 // Each iteration will OR 2 nodes and append the result until there is only
13616 // 1 node left, i.e. the final OR'd value of all vectors.
13617 SDValue LHS = VecIns[Slot];
13618 SDValue RHS = VecIns[Slot + 1];
13619 VecIns.push_back(DAG.getNode(ISD::OR, DL, TestVT, LHS, RHS));
13622 return DAG.getNode(X86ISD::PTEST, DL, MVT::i32,
13623 VecIns.back(), VecIns.back());
13626 /// \brief return true if \c Op has a use that doesn't just read flags.
13627 static bool hasNonFlagsUse(SDValue Op) {
13628 for (SDNode::use_iterator UI = Op->use_begin(), UE = Op->use_end(); UI != UE;
13630 SDNode *User = *UI;
13631 unsigned UOpNo = UI.getOperandNo();
13632 if (User->getOpcode() == ISD::TRUNCATE && User->hasOneUse()) {
13633 // Look pass truncate.
13634 UOpNo = User->use_begin().getOperandNo();
13635 User = *User->use_begin();
13638 if (User->getOpcode() != ISD::BRCOND && User->getOpcode() != ISD::SETCC &&
13639 !(User->getOpcode() == ISD::SELECT && UOpNo == 0))
13645 /// Emit nodes that will be selected as "test Op0,Op0", or something
13647 SDValue X86TargetLowering::EmitTest(SDValue Op, unsigned X86CC, SDLoc dl,
13648 SelectionDAG &DAG) const {
13649 if (Op.getValueType() == MVT::i1) {
13650 SDValue ExtOp = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i8, Op);
13651 return DAG.getNode(X86ISD::CMP, dl, MVT::i32, ExtOp,
13652 DAG.getConstant(0, dl, MVT::i8));
13654 // CF and OF aren't always set the way we want. Determine which
13655 // of these we need.
13656 bool NeedCF = false;
13657 bool NeedOF = false;
13660 case X86::COND_A: case X86::COND_AE:
13661 case X86::COND_B: case X86::COND_BE:
13664 case X86::COND_G: case X86::COND_GE:
13665 case X86::COND_L: case X86::COND_LE:
13666 case X86::COND_O: case X86::COND_NO: {
13667 // Check if we really need to set the
13668 // Overflow flag. If NoSignedWrap is present
13669 // that is not actually needed.
13670 switch (Op->getOpcode()) {
13675 const auto *BinNode = cast<BinaryWithFlagsSDNode>(Op.getNode());
13676 if (BinNode->Flags.hasNoSignedWrap())
13686 // See if we can use the EFLAGS value from the operand instead of
13687 // doing a separate TEST. TEST always sets OF and CF to 0, so unless
13688 // we prove that the arithmetic won't overflow, we can't use OF or CF.
13689 if (Op.getResNo() != 0 || NeedOF || NeedCF) {
13690 // Emit a CMP with 0, which is the TEST pattern.
13691 //if (Op.getValueType() == MVT::i1)
13692 // return DAG.getNode(X86ISD::CMP, dl, MVT::i1, Op,
13693 // DAG.getConstant(0, MVT::i1));
13694 return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op,
13695 DAG.getConstant(0, dl, Op.getValueType()));
13697 unsigned Opcode = 0;
13698 unsigned NumOperands = 0;
13700 // Truncate operations may prevent the merge of the SETCC instruction
13701 // and the arithmetic instruction before it. Attempt to truncate the operands
13702 // of the arithmetic instruction and use a reduced bit-width instruction.
13703 bool NeedTruncation = false;
13704 SDValue ArithOp = Op;
13705 if (Op->getOpcode() == ISD::TRUNCATE && Op->hasOneUse()) {
13706 SDValue Arith = Op->getOperand(0);
13707 // Both the trunc and the arithmetic op need to have one user each.
13708 if (Arith->hasOneUse())
13709 switch (Arith.getOpcode()) {
13716 NeedTruncation = true;
13722 // NOTICE: In the code below we use ArithOp to hold the arithmetic operation
13723 // which may be the result of a CAST. We use the variable 'Op', which is the
13724 // non-casted variable when we check for possible users.
13725 switch (ArithOp.getOpcode()) {
13727 // Due to an isel shortcoming, be conservative if this add is likely to be
13728 // selected as part of a load-modify-store instruction. When the root node
13729 // in a match is a store, isel doesn't know how to remap non-chain non-flag
13730 // uses of other nodes in the match, such as the ADD in this case. This
13731 // leads to the ADD being left around and reselected, with the result being
13732 // two adds in the output. Alas, even if none our users are stores, that
13733 // doesn't prove we're O.K. Ergo, if we have any parents that aren't
13734 // CopyToReg or SETCC, eschew INC/DEC. A better fix seems to require
13735 // climbing the DAG back to the root, and it doesn't seem to be worth the
13737 for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
13738 UE = Op.getNode()->use_end(); UI != UE; ++UI)
13739 if (UI->getOpcode() != ISD::CopyToReg &&
13740 UI->getOpcode() != ISD::SETCC &&
13741 UI->getOpcode() != ISD::STORE)
13744 if (ConstantSDNode *C =
13745 dyn_cast<ConstantSDNode>(ArithOp.getNode()->getOperand(1))) {
13746 // An add of one will be selected as an INC.
13747 if (C->isOne() && !Subtarget->slowIncDec()) {
13748 Opcode = X86ISD::INC;
13753 // An add of negative one (subtract of one) will be selected as a DEC.
13754 if (C->isAllOnesValue() && !Subtarget->slowIncDec()) {
13755 Opcode = X86ISD::DEC;
13761 // Otherwise use a regular EFLAGS-setting add.
13762 Opcode = X86ISD::ADD;
13767 // If we have a constant logical shift that's only used in a comparison
13768 // against zero turn it into an equivalent AND. This allows turning it into
13769 // a TEST instruction later.
13770 if ((X86CC == X86::COND_E || X86CC == X86::COND_NE) && Op->hasOneUse() &&
13771 isa<ConstantSDNode>(Op->getOperand(1)) && !hasNonFlagsUse(Op)) {
13772 EVT VT = Op.getValueType();
13773 unsigned BitWidth = VT.getSizeInBits();
13774 unsigned ShAmt = Op->getConstantOperandVal(1);
13775 if (ShAmt >= BitWidth) // Avoid undefined shifts.
13777 APInt Mask = ArithOp.getOpcode() == ISD::SRL
13778 ? APInt::getHighBitsSet(BitWidth, BitWidth - ShAmt)
13779 : APInt::getLowBitsSet(BitWidth, BitWidth - ShAmt);
13780 if (!Mask.isSignedIntN(32)) // Avoid large immediates.
13782 SDValue New = DAG.getNode(ISD::AND, dl, VT, Op->getOperand(0),
13783 DAG.getConstant(Mask, dl, VT));
13784 DAG.ReplaceAllUsesWith(Op, New);
13790 // If the primary and result isn't used, don't bother using X86ISD::AND,
13791 // because a TEST instruction will be better.
13792 if (!hasNonFlagsUse(Op))
13798 // Due to the ISEL shortcoming noted above, be conservative if this op is
13799 // likely to be selected as part of a load-modify-store instruction.
13800 for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
13801 UE = Op.getNode()->use_end(); UI != UE; ++UI)
13802 if (UI->getOpcode() == ISD::STORE)
13805 // Otherwise use a regular EFLAGS-setting instruction.
13806 switch (ArithOp.getOpcode()) {
13807 default: llvm_unreachable("unexpected operator!");
13808 case ISD::SUB: Opcode = X86ISD::SUB; break;
13809 case ISD::XOR: Opcode = X86ISD::XOR; break;
13810 case ISD::AND: Opcode = X86ISD::AND; break;
13812 if (!NeedTruncation && (X86CC == X86::COND_E || X86CC == X86::COND_NE)) {
13813 SDValue EFLAGS = LowerVectorAllZeroTest(Op, Subtarget, DAG);
13814 if (EFLAGS.getNode())
13817 Opcode = X86ISD::OR;
13831 return SDValue(Op.getNode(), 1);
13837 // If we found that truncation is beneficial, perform the truncation and
13839 if (NeedTruncation) {
13840 EVT VT = Op.getValueType();
13841 SDValue WideVal = Op->getOperand(0);
13842 EVT WideVT = WideVal.getValueType();
13843 unsigned ConvertedOp = 0;
13844 // Use a target machine opcode to prevent further DAGCombine
13845 // optimizations that may separate the arithmetic operations
13846 // from the setcc node.
13847 switch (WideVal.getOpcode()) {
13849 case ISD::ADD: ConvertedOp = X86ISD::ADD; break;
13850 case ISD::SUB: ConvertedOp = X86ISD::SUB; break;
13851 case ISD::AND: ConvertedOp = X86ISD::AND; break;
13852 case ISD::OR: ConvertedOp = X86ISD::OR; break;
13853 case ISD::XOR: ConvertedOp = X86ISD::XOR; break;
13857 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
13858 if (TLI.isOperationLegal(WideVal.getOpcode(), WideVT)) {
13859 SDValue V0 = DAG.getNode(ISD::TRUNCATE, dl, VT, WideVal.getOperand(0));
13860 SDValue V1 = DAG.getNode(ISD::TRUNCATE, dl, VT, WideVal.getOperand(1));
13861 Op = DAG.getNode(ConvertedOp, dl, VT, V0, V1);
13867 // Emit a CMP with 0, which is the TEST pattern.
13868 return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op,
13869 DAG.getConstant(0, dl, Op.getValueType()));
13871 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
13872 SmallVector<SDValue, 4> Ops(Op->op_begin(), Op->op_begin() + NumOperands);
13874 SDValue New = DAG.getNode(Opcode, dl, VTs, Ops);
13875 DAG.ReplaceAllUsesWith(Op, New);
13876 return SDValue(New.getNode(), 1);
13879 /// Emit nodes that will be selected as "cmp Op0,Op1", or something
13881 SDValue X86TargetLowering::EmitCmp(SDValue Op0, SDValue Op1, unsigned X86CC,
13882 SDLoc dl, SelectionDAG &DAG) const {
13883 if (isNullConstant(Op1))
13884 return EmitTest(Op0, X86CC, dl, DAG);
13886 assert(!(isa<ConstantSDNode>(Op1) && Op0.getValueType() == MVT::i1) &&
13887 "Unexpected comparison operation for MVT::i1 operands");
13889 if ((Op0.getValueType() == MVT::i8 || Op0.getValueType() == MVT::i16 ||
13890 Op0.getValueType() == MVT::i32 || Op0.getValueType() == MVT::i64)) {
13891 // Do the comparison at i32 if it's smaller, besides the Atom case.
13892 // This avoids subregister aliasing issues. Keep the smaller reference
13893 // if we're optimizing for size, however, as that'll allow better folding
13894 // of memory operations.
13895 if (Op0.getValueType() != MVT::i32 && Op0.getValueType() != MVT::i64 &&
13896 !DAG.getMachineFunction().getFunction()->optForMinSize() &&
13897 !Subtarget->isAtom()) {
13898 unsigned ExtendOp =
13899 isX86CCUnsigned(X86CC) ? ISD::ZERO_EXTEND : ISD::SIGN_EXTEND;
13900 Op0 = DAG.getNode(ExtendOp, dl, MVT::i32, Op0);
13901 Op1 = DAG.getNode(ExtendOp, dl, MVT::i32, Op1);
13903 // Use SUB instead of CMP to enable CSE between SUB and CMP.
13904 SDVTList VTs = DAG.getVTList(Op0.getValueType(), MVT::i32);
13905 SDValue Sub = DAG.getNode(X86ISD::SUB, dl, VTs,
13907 return SDValue(Sub.getNode(), 1);
13909 return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op0, Op1);
13912 /// Convert a comparison if required by the subtarget.
13913 SDValue X86TargetLowering::ConvertCmpIfNecessary(SDValue Cmp,
13914 SelectionDAG &DAG) const {
13915 // If the subtarget does not support the FUCOMI instruction, floating-point
13916 // comparisons have to be converted.
13917 if (Subtarget->hasCMov() ||
13918 Cmp.getOpcode() != X86ISD::CMP ||
13919 !Cmp.getOperand(0).getValueType().isFloatingPoint() ||
13920 !Cmp.getOperand(1).getValueType().isFloatingPoint())
13923 // The instruction selector will select an FUCOM instruction instead of
13924 // FUCOMI, which writes the comparison result to FPSW instead of EFLAGS. Hence
13925 // build an SDNode sequence that transfers the result from FPSW into EFLAGS:
13926 // (X86sahf (trunc (srl (X86fp_stsw (trunc (X86cmp ...)), 8))))
13928 SDValue TruncFPSW = DAG.getNode(ISD::TRUNCATE, dl, MVT::i16, Cmp);
13929 SDValue FNStSW = DAG.getNode(X86ISD::FNSTSW16r, dl, MVT::i16, TruncFPSW);
13930 SDValue Srl = DAG.getNode(ISD::SRL, dl, MVT::i16, FNStSW,
13931 DAG.getConstant(8, dl, MVT::i8));
13932 SDValue TruncSrl = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Srl);
13934 // Some 64-bit targets lack SAHF support, but they do support FCOMI.
13935 assert(Subtarget->hasLAHFSAHF() && "Target doesn't support SAHF or FCOMI?");
13936 return DAG.getNode(X86ISD::SAHF, dl, MVT::i32, TruncSrl);
13939 /// The minimum architected relative accuracy is 2^-12. We need one
13940 /// Newton-Raphson step to have a good float result (24 bits of precision).
13941 SDValue X86TargetLowering::getRsqrtEstimate(SDValue Op,
13942 DAGCombinerInfo &DCI,
13943 unsigned &RefinementSteps,
13944 bool &UseOneConstNR) const {
13945 EVT VT = Op.getValueType();
13946 const char *RecipOp;
13948 // SSE1 has rsqrtss and rsqrtps. AVX adds a 256-bit variant for rsqrtps.
13949 // TODO: Add support for AVX512 (v16f32).
13950 // It is likely not profitable to do this for f64 because a double-precision
13951 // rsqrt estimate with refinement on x86 prior to FMA requires at least 16
13952 // instructions: convert to single, rsqrtss, convert back to double, refine
13953 // (3 steps = at least 13 insts). If an 'rsqrtsd' variant was added to the ISA
13954 // along with FMA, this could be a throughput win.
13955 if (VT == MVT::f32 && Subtarget->hasSSE1())
13957 else if ((VT == MVT::v4f32 && Subtarget->hasSSE1()) ||
13958 (VT == MVT::v8f32 && Subtarget->hasAVX()))
13959 RecipOp = "vec-sqrtf";
13963 TargetRecip Recips = DCI.DAG.getTarget().Options.Reciprocals;
13964 if (!Recips.isEnabled(RecipOp))
13967 RefinementSteps = Recips.getRefinementSteps(RecipOp);
13968 UseOneConstNR = false;
13969 return DCI.DAG.getNode(X86ISD::FRSQRT, SDLoc(Op), VT, Op);
13972 /// The minimum architected relative accuracy is 2^-12. We need one
13973 /// Newton-Raphson step to have a good float result (24 bits of precision).
13974 SDValue X86TargetLowering::getRecipEstimate(SDValue Op,
13975 DAGCombinerInfo &DCI,
13976 unsigned &RefinementSteps) const {
13977 EVT VT = Op.getValueType();
13978 const char *RecipOp;
13980 // SSE1 has rcpss and rcpps. AVX adds a 256-bit variant for rcpps.
13981 // TODO: Add support for AVX512 (v16f32).
13982 // It is likely not profitable to do this for f64 because a double-precision
13983 // reciprocal estimate with refinement on x86 prior to FMA requires
13984 // 15 instructions: convert to single, rcpss, convert back to double, refine
13985 // (3 steps = 12 insts). If an 'rcpsd' variant was added to the ISA
13986 // along with FMA, this could be a throughput win.
13987 if (VT == MVT::f32 && Subtarget->hasSSE1())
13989 else if ((VT == MVT::v4f32 && Subtarget->hasSSE1()) ||
13990 (VT == MVT::v8f32 && Subtarget->hasAVX()))
13991 RecipOp = "vec-divf";
13995 TargetRecip Recips = DCI.DAG.getTarget().Options.Reciprocals;
13996 if (!Recips.isEnabled(RecipOp))
13999 RefinementSteps = Recips.getRefinementSteps(RecipOp);
14000 return DCI.DAG.getNode(X86ISD::FRCP, SDLoc(Op), VT, Op);
14003 /// If we have at least two divisions that use the same divisor, convert to
14004 /// multplication by a reciprocal. This may need to be adjusted for a given
14005 /// CPU if a division's cost is not at least twice the cost of a multiplication.
14006 /// This is because we still need one division to calculate the reciprocal and
14007 /// then we need two multiplies by that reciprocal as replacements for the
14008 /// original divisions.
14009 unsigned X86TargetLowering::combineRepeatedFPDivisors() const {
14013 /// LowerToBT - Result of 'and' is compared against zero. Turn it into a BT node
14014 /// if it's possible.
14015 SDValue X86TargetLowering::LowerToBT(SDValue And, ISD::CondCode CC,
14016 SDLoc dl, SelectionDAG &DAG) const {
14017 SDValue Op0 = And.getOperand(0);
14018 SDValue Op1 = And.getOperand(1);
14019 if (Op0.getOpcode() == ISD::TRUNCATE)
14020 Op0 = Op0.getOperand(0);
14021 if (Op1.getOpcode() == ISD::TRUNCATE)
14022 Op1 = Op1.getOperand(0);
14025 if (Op1.getOpcode() == ISD::SHL)
14026 std::swap(Op0, Op1);
14027 if (Op0.getOpcode() == ISD::SHL) {
14028 if (isOneConstant(Op0.getOperand(0))) {
14029 // If we looked past a truncate, check that it's only truncating away
14031 unsigned BitWidth = Op0.getValueSizeInBits();
14032 unsigned AndBitWidth = And.getValueSizeInBits();
14033 if (BitWidth > AndBitWidth) {
14035 DAG.computeKnownBits(Op0, Zeros, Ones);
14036 if (Zeros.countLeadingOnes() < BitWidth - AndBitWidth)
14040 RHS = Op0.getOperand(1);
14042 } else if (Op1.getOpcode() == ISD::Constant) {
14043 ConstantSDNode *AndRHS = cast<ConstantSDNode>(Op1);
14044 uint64_t AndRHSVal = AndRHS->getZExtValue();
14045 SDValue AndLHS = Op0;
14047 if (AndRHSVal == 1 && AndLHS.getOpcode() == ISD::SRL) {
14048 LHS = AndLHS.getOperand(0);
14049 RHS = AndLHS.getOperand(1);
14052 // Use BT if the immediate can't be encoded in a TEST instruction.
14053 if (!isUInt<32>(AndRHSVal) && isPowerOf2_64(AndRHSVal)) {
14055 RHS = DAG.getConstant(Log2_64_Ceil(AndRHSVal), dl, LHS.getValueType());
14059 if (LHS.getNode()) {
14060 // If LHS is i8, promote it to i32 with any_extend. There is no i8 BT
14061 // instruction. Since the shift amount is in-range-or-undefined, we know
14062 // that doing a bittest on the i32 value is ok. We extend to i32 because
14063 // the encoding for the i16 version is larger than the i32 version.
14064 // Also promote i16 to i32 for performance / code size reason.
14065 if (LHS.getValueType() == MVT::i8 ||
14066 LHS.getValueType() == MVT::i16)
14067 LHS = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, LHS);
14069 // If the operand types disagree, extend the shift amount to match. Since
14070 // BT ignores high bits (like shifts) we can use anyextend.
14071 if (LHS.getValueType() != RHS.getValueType())
14072 RHS = DAG.getNode(ISD::ANY_EXTEND, dl, LHS.getValueType(), RHS);
14074 SDValue BT = DAG.getNode(X86ISD::BT, dl, MVT::i32, LHS, RHS);
14075 X86::CondCode Cond = CC == ISD::SETEQ ? X86::COND_AE : X86::COND_B;
14076 return DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
14077 DAG.getConstant(Cond, dl, MVT::i8), BT);
14083 /// \brief - Turns an ISD::CondCode into a value suitable for SSE floating point
14085 static int translateX86FSETCC(ISD::CondCode SetCCOpcode, SDValue &Op0,
14090 // SSE Condition code mapping:
14099 switch (SetCCOpcode) {
14100 default: llvm_unreachable("Unexpected SETCC condition");
14102 case ISD::SETEQ: SSECC = 0; break;
14104 case ISD::SETGT: Swap = true; // Fallthrough
14106 case ISD::SETOLT: SSECC = 1; break;
14108 case ISD::SETGE: Swap = true; // Fallthrough
14110 case ISD::SETOLE: SSECC = 2; break;
14111 case ISD::SETUO: SSECC = 3; break;
14113 case ISD::SETNE: SSECC = 4; break;
14114 case ISD::SETULE: Swap = true; // Fallthrough
14115 case ISD::SETUGE: SSECC = 5; break;
14116 case ISD::SETULT: Swap = true; // Fallthrough
14117 case ISD::SETUGT: SSECC = 6; break;
14118 case ISD::SETO: SSECC = 7; break;
14120 case ISD::SETONE: SSECC = 8; break;
14123 std::swap(Op0, Op1);
14128 // Lower256IntVSETCC - Break a VSETCC 256-bit integer VSETCC into two new 128
14129 // ones, and then concatenate the result back.
14130 static SDValue Lower256IntVSETCC(SDValue Op, SelectionDAG &DAG) {
14131 MVT VT = Op.getSimpleValueType();
14133 assert(VT.is256BitVector() && Op.getOpcode() == ISD::SETCC &&
14134 "Unsupported value type for operation");
14136 unsigned NumElems = VT.getVectorNumElements();
14138 SDValue CC = Op.getOperand(2);
14140 // Extract the LHS vectors
14141 SDValue LHS = Op.getOperand(0);
14142 SDValue LHS1 = Extract128BitVector(LHS, 0, DAG, dl);
14143 SDValue LHS2 = Extract128BitVector(LHS, NumElems/2, DAG, dl);
14145 // Extract the RHS vectors
14146 SDValue RHS = Op.getOperand(1);
14147 SDValue RHS1 = Extract128BitVector(RHS, 0, DAG, dl);
14148 SDValue RHS2 = Extract128BitVector(RHS, NumElems/2, DAG, dl);
14150 // Issue the operation on the smaller types and concatenate the result back
14151 MVT EltVT = VT.getVectorElementType();
14152 MVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
14153 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
14154 DAG.getNode(Op.getOpcode(), dl, NewVT, LHS1, RHS1, CC),
14155 DAG.getNode(Op.getOpcode(), dl, NewVT, LHS2, RHS2, CC));
14158 static SDValue LowerBoolVSETCC_AVX512(SDValue Op, SelectionDAG &DAG) {
14159 SDValue Op0 = Op.getOperand(0);
14160 SDValue Op1 = Op.getOperand(1);
14161 SDValue CC = Op.getOperand(2);
14162 MVT VT = Op.getSimpleValueType();
14165 assert(Op0.getSimpleValueType().getVectorElementType() == MVT::i1 &&
14166 "Unexpected type for boolean compare operation");
14167 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
14168 SDValue NotOp0 = DAG.getNode(ISD::XOR, dl, VT, Op0,
14169 DAG.getConstant(-1, dl, VT));
14170 SDValue NotOp1 = DAG.getNode(ISD::XOR, dl, VT, Op1,
14171 DAG.getConstant(-1, dl, VT));
14172 switch (SetCCOpcode) {
14173 default: llvm_unreachable("Unexpected SETCC condition");
14175 // (x == y) -> ~(x ^ y)
14176 return DAG.getNode(ISD::XOR, dl, VT,
14177 DAG.getNode(ISD::XOR, dl, VT, Op0, Op1),
14178 DAG.getConstant(-1, dl, VT));
14180 // (x != y) -> (x ^ y)
14181 return DAG.getNode(ISD::XOR, dl, VT, Op0, Op1);
14184 // (x > y) -> (x & ~y)
14185 return DAG.getNode(ISD::AND, dl, VT, Op0, NotOp1);
14188 // (x < y) -> (~x & y)
14189 return DAG.getNode(ISD::AND, dl, VT, NotOp0, Op1);
14192 // (x <= y) -> (~x | y)
14193 return DAG.getNode(ISD::OR, dl, VT, NotOp0, Op1);
14196 // (x >=y) -> (x | ~y)
14197 return DAG.getNode(ISD::OR, dl, VT, Op0, NotOp1);
14201 static SDValue LowerIntVSETCC_AVX512(SDValue Op, SelectionDAG &DAG,
14202 const X86Subtarget *Subtarget) {
14203 SDValue Op0 = Op.getOperand(0);
14204 SDValue Op1 = Op.getOperand(1);
14205 SDValue CC = Op.getOperand(2);
14206 MVT VT = Op.getSimpleValueType();
14209 assert(Op0.getSimpleValueType().getVectorElementType().getSizeInBits() >= 8 &&
14210 Op.getSimpleValueType().getVectorElementType() == MVT::i1 &&
14211 "Cannot set masked compare for this operation");
14213 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
14215 bool Unsigned = false;
14218 switch (SetCCOpcode) {
14219 default: llvm_unreachable("Unexpected SETCC condition");
14220 case ISD::SETNE: SSECC = 4; break;
14221 case ISD::SETEQ: Opc = X86ISD::PCMPEQM; break;
14222 case ISD::SETUGT: SSECC = 6; Unsigned = true; break;
14223 case ISD::SETLT: Swap = true; //fall-through
14224 case ISD::SETGT: Opc = X86ISD::PCMPGTM; break;
14225 case ISD::SETULT: SSECC = 1; Unsigned = true; break;
14226 case ISD::SETUGE: SSECC = 5; Unsigned = true; break; //NLT
14227 case ISD::SETGE: Swap = true; SSECC = 2; break; // LE + swap
14228 case ISD::SETULE: Unsigned = true; //fall-through
14229 case ISD::SETLE: SSECC = 2; break;
14233 std::swap(Op0, Op1);
14235 return DAG.getNode(Opc, dl, VT, Op0, Op1);
14236 Opc = Unsigned ? X86ISD::CMPMU: X86ISD::CMPM;
14237 return DAG.getNode(Opc, dl, VT, Op0, Op1,
14238 DAG.getConstant(SSECC, dl, MVT::i8));
14241 /// \brief Try to turn a VSETULT into a VSETULE by modifying its second
14242 /// operand \p Op1. If non-trivial (for example because it's not constant)
14243 /// return an empty value.
14244 static SDValue ChangeVSETULTtoVSETULE(SDLoc dl, SDValue Op1, SelectionDAG &DAG)
14246 BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(Op1.getNode());
14250 MVT VT = Op1.getSimpleValueType();
14251 MVT EVT = VT.getVectorElementType();
14252 unsigned n = VT.getVectorNumElements();
14253 SmallVector<SDValue, 8> ULTOp1;
14255 for (unsigned i = 0; i < n; ++i) {
14256 ConstantSDNode *Elt = dyn_cast<ConstantSDNode>(BV->getOperand(i));
14257 if (!Elt || Elt->isOpaque() || Elt->getSimpleValueType(0) != EVT)
14260 // Avoid underflow.
14261 APInt Val = Elt->getAPIntValue();
14265 ULTOp1.push_back(DAG.getConstant(Val - 1, dl, EVT));
14268 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, ULTOp1);
14271 static SDValue LowerVSETCC(SDValue Op, const X86Subtarget *Subtarget,
14272 SelectionDAG &DAG) {
14273 SDValue Op0 = Op.getOperand(0);
14274 SDValue Op1 = Op.getOperand(1);
14275 SDValue CC = Op.getOperand(2);
14276 MVT VT = Op.getSimpleValueType();
14277 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
14278 bool isFP = Op.getOperand(1).getSimpleValueType().isFloatingPoint();
14283 MVT EltVT = Op0.getSimpleValueType().getVectorElementType();
14284 assert(EltVT == MVT::f32 || EltVT == MVT::f64);
14287 unsigned SSECC = translateX86FSETCC(SetCCOpcode, Op0, Op1);
14288 unsigned Opc = X86ISD::CMPP;
14289 if (Subtarget->hasAVX512() && VT.getVectorElementType() == MVT::i1) {
14290 assert(VT.getVectorNumElements() <= 16);
14291 Opc = X86ISD::CMPM;
14293 // In the two special cases we can't handle, emit two comparisons.
14296 unsigned CombineOpc;
14297 if (SetCCOpcode == ISD::SETUEQ) {
14298 CC0 = 3; CC1 = 0; CombineOpc = ISD::OR;
14300 assert(SetCCOpcode == ISD::SETONE);
14301 CC0 = 7; CC1 = 4; CombineOpc = ISD::AND;
14304 SDValue Cmp0 = DAG.getNode(Opc, dl, VT, Op0, Op1,
14305 DAG.getConstant(CC0, dl, MVT::i8));
14306 SDValue Cmp1 = DAG.getNode(Opc, dl, VT, Op0, Op1,
14307 DAG.getConstant(CC1, dl, MVT::i8));
14308 return DAG.getNode(CombineOpc, dl, VT, Cmp0, Cmp1);
14310 // Handle all other FP comparisons here.
14311 return DAG.getNode(Opc, dl, VT, Op0, Op1,
14312 DAG.getConstant(SSECC, dl, MVT::i8));
14315 MVT VTOp0 = Op0.getSimpleValueType();
14316 assert(VTOp0 == Op1.getSimpleValueType() &&
14317 "Expected operands with same type!");
14318 assert(VT.getVectorNumElements() == VTOp0.getVectorNumElements() &&
14319 "Invalid number of packed elements for source and destination!");
14321 if (VT.is128BitVector() && VTOp0.is256BitVector()) {
14322 // On non-AVX512 targets, a vector of MVT::i1 is promoted by the type
14323 // legalizer to a wider vector type. In the case of 'vsetcc' nodes, the
14324 // legalizer firstly checks if the first operand in input to the setcc has
14325 // a legal type. If so, then it promotes the return type to that same type.
14326 // Otherwise, the return type is promoted to the 'next legal type' which,
14327 // for a vector of MVT::i1 is always a 128-bit integer vector type.
14329 // We reach this code only if the following two conditions are met:
14330 // 1. Both return type and operand type have been promoted to wider types
14331 // by the type legalizer.
14332 // 2. The original operand type has been promoted to a 256-bit vector.
14334 // Note that condition 2. only applies for AVX targets.
14335 SDValue NewOp = DAG.getSetCC(dl, VTOp0, Op0, Op1, SetCCOpcode);
14336 return DAG.getZExtOrTrunc(NewOp, dl, VT);
14339 // The non-AVX512 code below works under the assumption that source and
14340 // destination types are the same.
14341 assert((Subtarget->hasAVX512() || (VT == VTOp0)) &&
14342 "Value types for source and destination must be the same!");
14344 // Break 256-bit integer vector compare into smaller ones.
14345 if (VT.is256BitVector() && !Subtarget->hasInt256())
14346 return Lower256IntVSETCC(Op, DAG);
14348 MVT OpVT = Op1.getSimpleValueType();
14349 if (OpVT.getVectorElementType() == MVT::i1)
14350 return LowerBoolVSETCC_AVX512(Op, DAG);
14352 bool MaskResult = (VT.getVectorElementType() == MVT::i1);
14353 if (Subtarget->hasAVX512()) {
14354 if (Op1.getSimpleValueType().is512BitVector() ||
14355 (Subtarget->hasBWI() && Subtarget->hasVLX()) ||
14356 (MaskResult && OpVT.getVectorElementType().getSizeInBits() >= 32))
14357 return LowerIntVSETCC_AVX512(Op, DAG, Subtarget);
14359 // In AVX-512 architecture setcc returns mask with i1 elements,
14360 // But there is no compare instruction for i8 and i16 elements in KNL.
14361 // We are not talking about 512-bit operands in this case, these
14362 // types are illegal.
14364 (OpVT.getVectorElementType().getSizeInBits() < 32 &&
14365 OpVT.getVectorElementType().getSizeInBits() >= 8))
14366 return DAG.getNode(ISD::TRUNCATE, dl, VT,
14367 DAG.getNode(ISD::SETCC, dl, OpVT, Op0, Op1, CC));
14370 // Lower using XOP integer comparisons.
14371 if ((VT == MVT::v16i8 || VT == MVT::v8i16 ||
14372 VT == MVT::v4i32 || VT == MVT::v2i64) && Subtarget->hasXOP()) {
14373 // Translate compare code to XOP PCOM compare mode.
14374 unsigned CmpMode = 0;
14375 switch (SetCCOpcode) {
14376 default: llvm_unreachable("Unexpected SETCC condition");
14378 case ISD::SETLT: CmpMode = 0x00; break;
14380 case ISD::SETLE: CmpMode = 0x01; break;
14382 case ISD::SETGT: CmpMode = 0x02; break;
14384 case ISD::SETGE: CmpMode = 0x03; break;
14385 case ISD::SETEQ: CmpMode = 0x04; break;
14386 case ISD::SETNE: CmpMode = 0x05; break;
14389 // Are we comparing unsigned or signed integers?
14390 unsigned Opc = ISD::isUnsignedIntSetCC(SetCCOpcode)
14391 ? X86ISD::VPCOMU : X86ISD::VPCOM;
14393 return DAG.getNode(Opc, dl, VT, Op0, Op1,
14394 DAG.getConstant(CmpMode, dl, MVT::i8));
14397 // We are handling one of the integer comparisons here. Since SSE only has
14398 // GT and EQ comparisons for integer, swapping operands and multiple
14399 // operations may be required for some comparisons.
14401 bool Swap = false, Invert = false, FlipSigns = false, MinMax = false;
14402 bool Subus = false;
14404 switch (SetCCOpcode) {
14405 default: llvm_unreachable("Unexpected SETCC condition");
14406 case ISD::SETNE: Invert = true;
14407 case ISD::SETEQ: Opc = X86ISD::PCMPEQ; break;
14408 case ISD::SETLT: Swap = true;
14409 case ISD::SETGT: Opc = X86ISD::PCMPGT; break;
14410 case ISD::SETGE: Swap = true;
14411 case ISD::SETLE: Opc = X86ISD::PCMPGT;
14412 Invert = true; break;
14413 case ISD::SETULT: Swap = true;
14414 case ISD::SETUGT: Opc = X86ISD::PCMPGT;
14415 FlipSigns = true; break;
14416 case ISD::SETUGE: Swap = true;
14417 case ISD::SETULE: Opc = X86ISD::PCMPGT;
14418 FlipSigns = true; Invert = true; break;
14421 // Special case: Use min/max operations for SETULE/SETUGE
14422 MVT VET = VT.getVectorElementType();
14424 (Subtarget->hasSSE41() && (VET >= MVT::i8 && VET <= MVT::i32))
14425 || (Subtarget->hasSSE2() && (VET == MVT::i8));
14428 switch (SetCCOpcode) {
14430 case ISD::SETULE: Opc = ISD::UMIN; MinMax = true; break;
14431 case ISD::SETUGE: Opc = ISD::UMAX; MinMax = true; break;
14434 if (MinMax) { Swap = false; Invert = false; FlipSigns = false; }
14437 bool hasSubus = Subtarget->hasSSE2() && (VET == MVT::i8 || VET == MVT::i16);
14438 if (!MinMax && hasSubus) {
14439 // As another special case, use PSUBUS[BW] when it's profitable. E.g. for
14441 // t = psubus Op0, Op1
14442 // pcmpeq t, <0..0>
14443 switch (SetCCOpcode) {
14445 case ISD::SETULT: {
14446 // If the comparison is against a constant we can turn this into a
14447 // setule. With psubus, setule does not require a swap. This is
14448 // beneficial because the constant in the register is no longer
14449 // destructed as the destination so it can be hoisted out of a loop.
14450 // Only do this pre-AVX since vpcmp* is no longer destructive.
14451 if (Subtarget->hasAVX())
14453 SDValue ULEOp1 = ChangeVSETULTtoVSETULE(dl, Op1, DAG);
14454 if (ULEOp1.getNode()) {
14456 Subus = true; Invert = false; Swap = false;
14460 // Psubus is better than flip-sign because it requires no inversion.
14461 case ISD::SETUGE: Subus = true; Invert = false; Swap = true; break;
14462 case ISD::SETULE: Subus = true; Invert = false; Swap = false; break;
14466 Opc = X86ISD::SUBUS;
14472 std::swap(Op0, Op1);
14474 // Check that the operation in question is available (most are plain SSE2,
14475 // but PCMPGTQ and PCMPEQQ have different requirements).
14476 if (VT == MVT::v2i64) {
14477 if (Opc == X86ISD::PCMPGT && !Subtarget->hasSSE42()) {
14478 assert(Subtarget->hasSSE2() && "Don't know how to lower!");
14480 // First cast everything to the right type.
14481 Op0 = DAG.getBitcast(MVT::v4i32, Op0);
14482 Op1 = DAG.getBitcast(MVT::v4i32, Op1);
14484 // Since SSE has no unsigned integer comparisons, we need to flip the sign
14485 // bits of the inputs before performing those operations. The lower
14486 // compare is always unsigned.
14489 SB = DAG.getConstant(0x80000000U, dl, MVT::v4i32);
14491 SDValue Sign = DAG.getConstant(0x80000000U, dl, MVT::i32);
14492 SDValue Zero = DAG.getConstant(0x00000000U, dl, MVT::i32);
14493 SB = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v4i32,
14494 Sign, Zero, Sign, Zero);
14496 Op0 = DAG.getNode(ISD::XOR, dl, MVT::v4i32, Op0, SB);
14497 Op1 = DAG.getNode(ISD::XOR, dl, MVT::v4i32, Op1, SB);
14499 // Emulate PCMPGTQ with (hi1 > hi2) | ((hi1 == hi2) & (lo1 > lo2))
14500 SDValue GT = DAG.getNode(X86ISD::PCMPGT, dl, MVT::v4i32, Op0, Op1);
14501 SDValue EQ = DAG.getNode(X86ISD::PCMPEQ, dl, MVT::v4i32, Op0, Op1);
14503 // Create masks for only the low parts/high parts of the 64 bit integers.
14504 static const int MaskHi[] = { 1, 1, 3, 3 };
14505 static const int MaskLo[] = { 0, 0, 2, 2 };
14506 SDValue EQHi = DAG.getVectorShuffle(MVT::v4i32, dl, EQ, EQ, MaskHi);
14507 SDValue GTLo = DAG.getVectorShuffle(MVT::v4i32, dl, GT, GT, MaskLo);
14508 SDValue GTHi = DAG.getVectorShuffle(MVT::v4i32, dl, GT, GT, MaskHi);
14510 SDValue Result = DAG.getNode(ISD::AND, dl, MVT::v4i32, EQHi, GTLo);
14511 Result = DAG.getNode(ISD::OR, dl, MVT::v4i32, Result, GTHi);
14514 Result = DAG.getNOT(dl, Result, MVT::v4i32);
14516 return DAG.getBitcast(VT, Result);
14519 if (Opc == X86ISD::PCMPEQ && !Subtarget->hasSSE41()) {
14520 // If pcmpeqq is missing but pcmpeqd is available synthesize pcmpeqq with
14521 // pcmpeqd + pshufd + pand.
14522 assert(Subtarget->hasSSE2() && !FlipSigns && "Don't know how to lower!");
14524 // First cast everything to the right type.
14525 Op0 = DAG.getBitcast(MVT::v4i32, Op0);
14526 Op1 = DAG.getBitcast(MVT::v4i32, Op1);
14529 SDValue Result = DAG.getNode(Opc, dl, MVT::v4i32, Op0, Op1);
14531 // Make sure the lower and upper halves are both all-ones.
14532 static const int Mask[] = { 1, 0, 3, 2 };
14533 SDValue Shuf = DAG.getVectorShuffle(MVT::v4i32, dl, Result, Result, Mask);
14534 Result = DAG.getNode(ISD::AND, dl, MVT::v4i32, Result, Shuf);
14537 Result = DAG.getNOT(dl, Result, MVT::v4i32);
14539 return DAG.getBitcast(VT, Result);
14543 // Since SSE has no unsigned integer comparisons, we need to flip the sign
14544 // bits of the inputs before performing those operations.
14546 MVT EltVT = VT.getVectorElementType();
14547 SDValue SB = DAG.getConstant(APInt::getSignBit(EltVT.getSizeInBits()), dl,
14549 Op0 = DAG.getNode(ISD::XOR, dl, VT, Op0, SB);
14550 Op1 = DAG.getNode(ISD::XOR, dl, VT, Op1, SB);
14553 SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
14555 // If the logical-not of the result is required, perform that now.
14557 Result = DAG.getNOT(dl, Result, VT);
14560 Result = DAG.getNode(X86ISD::PCMPEQ, dl, VT, Op0, Result);
14563 Result = DAG.getNode(X86ISD::PCMPEQ, dl, VT, Result,
14564 getZeroVector(VT, Subtarget, DAG, dl));
14569 SDValue X86TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
14571 MVT VT = Op.getSimpleValueType();
14573 if (VT.isVector()) return LowerVSETCC(Op, Subtarget, DAG);
14575 assert(((!Subtarget->hasAVX512() && VT == MVT::i8) || (VT == MVT::i1))
14576 && "SetCC type must be 8-bit or 1-bit integer");
14577 SDValue Op0 = Op.getOperand(0);
14578 SDValue Op1 = Op.getOperand(1);
14580 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
14582 // Optimize to BT if possible.
14583 // Lower (X & (1 << N)) == 0 to BT(X, N).
14584 // Lower ((X >>u N) & 1) != 0 to BT(X, N).
14585 // Lower ((X >>s N) & 1) != 0 to BT(X, N).
14586 if (Op0.getOpcode() == ISD::AND && Op0.hasOneUse() &&
14587 isNullConstant(Op1) &&
14588 (CC == ISD::SETEQ || CC == ISD::SETNE)) {
14589 if (SDValue NewSetCC = LowerToBT(Op0, CC, dl, DAG)) {
14591 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, NewSetCC);
14596 // Look for X == 0, X == 1, X != 0, or X != 1. We can simplify some forms of
14598 if ((isOneConstant(Op1) || isNullConstant(Op1)) &&
14599 (CC == ISD::SETEQ || CC == ISD::SETNE)) {
14601 // If the input is a setcc, then reuse the input setcc or use a new one with
14602 // the inverted condition.
14603 if (Op0.getOpcode() == X86ISD::SETCC) {
14604 X86::CondCode CCode = (X86::CondCode)Op0.getConstantOperandVal(0);
14605 bool Invert = (CC == ISD::SETNE) ^ isNullConstant(Op1);
14609 CCode = X86::GetOppositeBranchCondition(CCode);
14610 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
14611 DAG.getConstant(CCode, dl, MVT::i8),
14612 Op0.getOperand(1));
14614 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, SetCC);
14618 if ((Op0.getValueType() == MVT::i1) && isOneConstant(Op1) &&
14619 (CC == ISD::SETEQ || CC == ISD::SETNE)) {
14621 ISD::CondCode NewCC = ISD::getSetCCInverse(CC, true);
14622 return DAG.getSetCC(dl, VT, Op0, DAG.getConstant(0, dl, MVT::i1), NewCC);
14625 bool isFP = Op1.getSimpleValueType().isFloatingPoint();
14626 unsigned X86CC = TranslateX86CC(CC, dl, isFP, Op0, Op1, DAG);
14627 if (X86CC == X86::COND_INVALID)
14630 SDValue EFLAGS = EmitCmp(Op0, Op1, X86CC, dl, DAG);
14631 EFLAGS = ConvertCmpIfNecessary(EFLAGS, DAG);
14632 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
14633 DAG.getConstant(X86CC, dl, MVT::i8), EFLAGS);
14635 return DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, SetCC);
14639 SDValue X86TargetLowering::LowerSETCCE(SDValue Op, SelectionDAG &DAG) const {
14640 SDValue LHS = Op.getOperand(0);
14641 SDValue RHS = Op.getOperand(1);
14642 SDValue Carry = Op.getOperand(2);
14643 SDValue Cond = Op.getOperand(3);
14646 assert(LHS.getSimpleValueType().isInteger() && "SETCCE is integer only.");
14647 X86::CondCode CC = TranslateIntegerX86CC(cast<CondCodeSDNode>(Cond)->get());
14649 assert(Carry.getOpcode() != ISD::CARRY_FALSE);
14650 SDVTList VTs = DAG.getVTList(LHS.getValueType(), MVT::i32);
14651 SDValue Cmp = DAG.getNode(X86ISD::SBB, DL, VTs, LHS, RHS, Carry);
14652 return DAG.getNode(X86ISD::SETCC, DL, Op.getValueType(),
14653 DAG.getConstant(CC, DL, MVT::i8), Cmp.getValue(1));
14656 // isX86LogicalCmp - Return true if opcode is a X86 logical comparison.
14657 static bool isX86LogicalCmp(SDValue Op) {
14658 unsigned Opc = Op.getNode()->getOpcode();
14659 if (Opc == X86ISD::CMP || Opc == X86ISD::COMI || Opc == X86ISD::UCOMI ||
14660 Opc == X86ISD::SAHF)
14662 if (Op.getResNo() == 1 &&
14663 (Opc == X86ISD::ADD ||
14664 Opc == X86ISD::SUB ||
14665 Opc == X86ISD::ADC ||
14666 Opc == X86ISD::SBB ||
14667 Opc == X86ISD::SMUL ||
14668 Opc == X86ISD::UMUL ||
14669 Opc == X86ISD::INC ||
14670 Opc == X86ISD::DEC ||
14671 Opc == X86ISD::OR ||
14672 Opc == X86ISD::XOR ||
14673 Opc == X86ISD::AND))
14676 if (Op.getResNo() == 2 && Opc == X86ISD::UMUL)
14682 static bool isTruncWithZeroHighBitsInput(SDValue V, SelectionDAG &DAG) {
14683 if (V.getOpcode() != ISD::TRUNCATE)
14686 SDValue VOp0 = V.getOperand(0);
14687 unsigned InBits = VOp0.getValueSizeInBits();
14688 unsigned Bits = V.getValueSizeInBits();
14689 return DAG.MaskedValueIsZero(VOp0, APInt::getHighBitsSet(InBits,InBits-Bits));
14692 SDValue X86TargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const {
14693 bool addTest = true;
14694 SDValue Cond = Op.getOperand(0);
14695 SDValue Op1 = Op.getOperand(1);
14696 SDValue Op2 = Op.getOperand(2);
14698 MVT VT = Op1.getSimpleValueType();
14701 // Lower FP selects into a CMP/AND/ANDN/OR sequence when the necessary SSE ops
14702 // are available or VBLENDV if AVX is available.
14703 // Otherwise FP cmovs get lowered into a less efficient branch sequence later.
14704 if (Cond.getOpcode() == ISD::SETCC &&
14705 ((Subtarget->hasSSE2() && (VT == MVT::f32 || VT == MVT::f64)) ||
14706 (Subtarget->hasSSE1() && VT == MVT::f32)) &&
14707 VT == Cond.getOperand(0).getSimpleValueType() && Cond->hasOneUse()) {
14708 SDValue CondOp0 = Cond.getOperand(0), CondOp1 = Cond.getOperand(1);
14709 int SSECC = translateX86FSETCC(
14710 cast<CondCodeSDNode>(Cond.getOperand(2))->get(), CondOp0, CondOp1);
14713 if (Subtarget->hasAVX512()) {
14714 SDValue Cmp = DAG.getNode(X86ISD::FSETCC, DL, MVT::i1, CondOp0, CondOp1,
14715 DAG.getConstant(SSECC, DL, MVT::i8));
14716 return DAG.getNode(X86ISD::SELECT, DL, VT, Cmp, Op1, Op2);
14719 SDValue Cmp = DAG.getNode(X86ISD::FSETCC, DL, VT, CondOp0, CondOp1,
14720 DAG.getConstant(SSECC, DL, MVT::i8));
14722 // If we have AVX, we can use a variable vector select (VBLENDV) instead
14723 // of 3 logic instructions for size savings and potentially speed.
14724 // Unfortunately, there is no scalar form of VBLENDV.
14726 // If either operand is a constant, don't try this. We can expect to
14727 // optimize away at least one of the logic instructions later in that
14728 // case, so that sequence would be faster than a variable blend.
14730 // BLENDV was introduced with SSE 4.1, but the 2 register form implicitly
14731 // uses XMM0 as the selection register. That may need just as many
14732 // instructions as the AND/ANDN/OR sequence due to register moves, so
14735 if (Subtarget->hasAVX() &&
14736 !isa<ConstantFPSDNode>(Op1) && !isa<ConstantFPSDNode>(Op2)) {
14738 // Convert to vectors, do a VSELECT, and convert back to scalar.
14739 // All of the conversions should be optimized away.
14741 MVT VecVT = VT == MVT::f32 ? MVT::v4f32 : MVT::v2f64;
14742 SDValue VOp1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, VecVT, Op1);
14743 SDValue VOp2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, VecVT, Op2);
14744 SDValue VCmp = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, VecVT, Cmp);
14746 MVT VCmpVT = VT == MVT::f32 ? MVT::v4i32 : MVT::v2i64;
14747 VCmp = DAG.getBitcast(VCmpVT, VCmp);
14749 SDValue VSel = DAG.getNode(ISD::VSELECT, DL, VecVT, VCmp, VOp1, VOp2);
14751 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT,
14752 VSel, DAG.getIntPtrConstant(0, DL));
14754 SDValue AndN = DAG.getNode(X86ISD::FANDN, DL, VT, Cmp, Op2);
14755 SDValue And = DAG.getNode(X86ISD::FAND, DL, VT, Cmp, Op1);
14756 return DAG.getNode(X86ISD::FOR, DL, VT, AndN, And);
14760 if (VT.isVector() && VT.getVectorElementType() == MVT::i1) {
14762 if (ISD::isBuildVectorOfConstantSDNodes(Op1.getNode()))
14763 Op1Scalar = ConvertI1VectorToInteger(Op1, DAG);
14764 else if (Op1.getOpcode() == ISD::BITCAST && Op1.getOperand(0))
14765 Op1Scalar = Op1.getOperand(0);
14767 if (ISD::isBuildVectorOfConstantSDNodes(Op2.getNode()))
14768 Op2Scalar = ConvertI1VectorToInteger(Op2, DAG);
14769 else if (Op2.getOpcode() == ISD::BITCAST && Op2.getOperand(0))
14770 Op2Scalar = Op2.getOperand(0);
14771 if (Op1Scalar.getNode() && Op2Scalar.getNode()) {
14772 SDValue newSelect = DAG.getNode(ISD::SELECT, DL,
14773 Op1Scalar.getValueType(),
14774 Cond, Op1Scalar, Op2Scalar);
14775 if (newSelect.getValueSizeInBits() == VT.getSizeInBits())
14776 return DAG.getBitcast(VT, newSelect);
14777 SDValue ExtVec = DAG.getBitcast(MVT::v8i1, newSelect);
14778 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, ExtVec,
14779 DAG.getIntPtrConstant(0, DL));
14783 if (VT == MVT::v4i1 || VT == MVT::v2i1) {
14784 SDValue zeroConst = DAG.getIntPtrConstant(0, DL);
14785 Op1 = DAG.getNode(ISD::INSERT_SUBVECTOR, DL, MVT::v8i1,
14786 DAG.getUNDEF(MVT::v8i1), Op1, zeroConst);
14787 Op2 = DAG.getNode(ISD::INSERT_SUBVECTOR, DL, MVT::v8i1,
14788 DAG.getUNDEF(MVT::v8i1), Op2, zeroConst);
14789 SDValue newSelect = DAG.getNode(ISD::SELECT, DL, MVT::v8i1,
14791 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, newSelect, zeroConst);
14794 if (Cond.getOpcode() == ISD::SETCC) {
14795 SDValue NewCond = LowerSETCC(Cond, DAG);
14796 if (NewCond.getNode())
14800 // (select (x == 0), -1, y) -> (sign_bit (x - 1)) | y
14801 // (select (x == 0), y, -1) -> ~(sign_bit (x - 1)) | y
14802 // (select (x != 0), y, -1) -> (sign_bit (x - 1)) | y
14803 // (select (x != 0), -1, y) -> ~(sign_bit (x - 1)) | y
14804 if (Cond.getOpcode() == X86ISD::SETCC &&
14805 Cond.getOperand(1).getOpcode() == X86ISD::CMP &&
14806 isNullConstant(Cond.getOperand(1).getOperand(1))) {
14807 SDValue Cmp = Cond.getOperand(1);
14809 unsigned CondCode =cast<ConstantSDNode>(Cond.getOperand(0))->getZExtValue();
14811 if ((isAllOnesConstant(Op1) || isAllOnesConstant(Op2)) &&
14812 (CondCode == X86::COND_E || CondCode == X86::COND_NE)) {
14813 SDValue Y = isAllOnesConstant(Op2) ? Op1 : Op2;
14815 SDValue CmpOp0 = Cmp.getOperand(0);
14816 // Apply further optimizations for special cases
14817 // (select (x != 0), -1, 0) -> neg & sbb
14818 // (select (x == 0), 0, -1) -> neg & sbb
14819 if (isNullConstant(Y) &&
14820 (isAllOnesConstant(Op1) == (CondCode == X86::COND_NE))) {
14821 SDVTList VTs = DAG.getVTList(CmpOp0.getValueType(), MVT::i32);
14822 SDValue Neg = DAG.getNode(X86ISD::SUB, DL, VTs,
14823 DAG.getConstant(0, DL,
14824 CmpOp0.getValueType()),
14826 SDValue Res = DAG.getNode(X86ISD::SETCC_CARRY, DL, Op.getValueType(),
14827 DAG.getConstant(X86::COND_B, DL, MVT::i8),
14828 SDValue(Neg.getNode(), 1));
14832 Cmp = DAG.getNode(X86ISD::CMP, DL, MVT::i32,
14833 CmpOp0, DAG.getConstant(1, DL, CmpOp0.getValueType()));
14834 Cmp = ConvertCmpIfNecessary(Cmp, DAG);
14836 SDValue Res = // Res = 0 or -1.
14837 DAG.getNode(X86ISD::SETCC_CARRY, DL, Op.getValueType(),
14838 DAG.getConstant(X86::COND_B, DL, MVT::i8), Cmp);
14840 if (isAllOnesConstant(Op1) != (CondCode == X86::COND_E))
14841 Res = DAG.getNOT(DL, Res, Res.getValueType());
14843 if (!isNullConstant(Op2))
14844 Res = DAG.getNode(ISD::OR, DL, Res.getValueType(), Res, Y);
14849 // Look past (and (setcc_carry (cmp ...)), 1).
14850 if (Cond.getOpcode() == ISD::AND &&
14851 Cond.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY &&
14852 isOneConstant(Cond.getOperand(1)))
14853 Cond = Cond.getOperand(0);
14855 // If condition flag is set by a X86ISD::CMP, then use it as the condition
14856 // setting operand in place of the X86ISD::SETCC.
14857 unsigned CondOpcode = Cond.getOpcode();
14858 if (CondOpcode == X86ISD::SETCC ||
14859 CondOpcode == X86ISD::SETCC_CARRY) {
14860 CC = Cond.getOperand(0);
14862 SDValue Cmp = Cond.getOperand(1);
14863 unsigned Opc = Cmp.getOpcode();
14864 MVT VT = Op.getSimpleValueType();
14866 bool IllegalFPCMov = false;
14867 if (VT.isFloatingPoint() && !VT.isVector() &&
14868 !isScalarFPTypeInSSEReg(VT)) // FPStack?
14869 IllegalFPCMov = !hasFPCMov(cast<ConstantSDNode>(CC)->getSExtValue());
14871 if ((isX86LogicalCmp(Cmp) && !IllegalFPCMov) ||
14872 Opc == X86ISD::BT) { // FIXME
14876 } else if (CondOpcode == ISD::USUBO || CondOpcode == ISD::SSUBO ||
14877 CondOpcode == ISD::UADDO || CondOpcode == ISD::SADDO ||
14878 ((CondOpcode == ISD::UMULO || CondOpcode == ISD::SMULO) &&
14879 Cond.getOperand(0).getValueType() != MVT::i8)) {
14880 SDValue LHS = Cond.getOperand(0);
14881 SDValue RHS = Cond.getOperand(1);
14882 unsigned X86Opcode;
14885 switch (CondOpcode) {
14886 case ISD::UADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_B; break;
14887 case ISD::SADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_O; break;
14888 case ISD::USUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_B; break;
14889 case ISD::SSUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_O; break;
14890 case ISD::UMULO: X86Opcode = X86ISD::UMUL; X86Cond = X86::COND_O; break;
14891 case ISD::SMULO: X86Opcode = X86ISD::SMUL; X86Cond = X86::COND_O; break;
14892 default: llvm_unreachable("unexpected overflowing operator");
14894 if (CondOpcode == ISD::UMULO)
14895 VTs = DAG.getVTList(LHS.getValueType(), LHS.getValueType(),
14898 VTs = DAG.getVTList(LHS.getValueType(), MVT::i32);
14900 SDValue X86Op = DAG.getNode(X86Opcode, DL, VTs, LHS, RHS);
14902 if (CondOpcode == ISD::UMULO)
14903 Cond = X86Op.getValue(2);
14905 Cond = X86Op.getValue(1);
14907 CC = DAG.getConstant(X86Cond, DL, MVT::i8);
14912 // Look past the truncate if the high bits are known zero.
14913 if (isTruncWithZeroHighBitsInput(Cond, DAG))
14914 Cond = Cond.getOperand(0);
14916 // We know the result of AND is compared against zero. Try to match
14918 if (Cond.getOpcode() == ISD::AND && Cond.hasOneUse()) {
14919 if (SDValue NewSetCC = LowerToBT(Cond, ISD::SETNE, DL, DAG)) {
14920 CC = NewSetCC.getOperand(0);
14921 Cond = NewSetCC.getOperand(1);
14928 CC = DAG.getConstant(X86::COND_NE, DL, MVT::i8);
14929 Cond = EmitTest(Cond, X86::COND_NE, DL, DAG);
14932 // a < b ? -1 : 0 -> RES = ~setcc_carry
14933 // a < b ? 0 : -1 -> RES = setcc_carry
14934 // a >= b ? -1 : 0 -> RES = setcc_carry
14935 // a >= b ? 0 : -1 -> RES = ~setcc_carry
14936 if (Cond.getOpcode() == X86ISD::SUB) {
14937 Cond = ConvertCmpIfNecessary(Cond, DAG);
14938 unsigned CondCode = cast<ConstantSDNode>(CC)->getZExtValue();
14940 if ((CondCode == X86::COND_AE || CondCode == X86::COND_B) &&
14941 (isAllOnesConstant(Op1) || isAllOnesConstant(Op2)) &&
14942 (isNullConstant(Op1) || isNullConstant(Op2))) {
14943 SDValue Res = DAG.getNode(X86ISD::SETCC_CARRY, DL, Op.getValueType(),
14944 DAG.getConstant(X86::COND_B, DL, MVT::i8),
14946 if (isAllOnesConstant(Op1) != (CondCode == X86::COND_B))
14947 return DAG.getNOT(DL, Res, Res.getValueType());
14952 // X86 doesn't have an i8 cmov. If both operands are the result of a truncate
14953 // widen the cmov and push the truncate through. This avoids introducing a new
14954 // branch during isel and doesn't add any extensions.
14955 if (Op.getValueType() == MVT::i8 &&
14956 Op1.getOpcode() == ISD::TRUNCATE && Op2.getOpcode() == ISD::TRUNCATE) {
14957 SDValue T1 = Op1.getOperand(0), T2 = Op2.getOperand(0);
14958 if (T1.getValueType() == T2.getValueType() &&
14959 // Blacklist CopyFromReg to avoid partial register stalls.
14960 T1.getOpcode() != ISD::CopyFromReg && T2.getOpcode()!=ISD::CopyFromReg){
14961 SDVTList VTs = DAG.getVTList(T1.getValueType(), MVT::Glue);
14962 SDValue Cmov = DAG.getNode(X86ISD::CMOV, DL, VTs, T2, T1, CC, Cond);
14963 return DAG.getNode(ISD::TRUNCATE, DL, Op.getValueType(), Cmov);
14967 // X86ISD::CMOV means set the result (which is operand 1) to the RHS if
14968 // condition is true.
14969 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
14970 SDValue Ops[] = { Op2, Op1, CC, Cond };
14971 return DAG.getNode(X86ISD::CMOV, DL, VTs, Ops);
14974 static SDValue LowerSIGN_EXTEND_AVX512(SDValue Op,
14975 const X86Subtarget *Subtarget,
14976 SelectionDAG &DAG) {
14977 MVT VT = Op->getSimpleValueType(0);
14978 SDValue In = Op->getOperand(0);
14979 MVT InVT = In.getSimpleValueType();
14980 MVT VTElt = VT.getVectorElementType();
14981 MVT InVTElt = InVT.getVectorElementType();
14985 if ((InVTElt == MVT::i1) &&
14986 (((Subtarget->hasBWI() && Subtarget->hasVLX() &&
14987 VT.getSizeInBits() <= 256 && VTElt.getSizeInBits() <= 16)) ||
14989 ((Subtarget->hasBWI() && VT.is512BitVector() &&
14990 VTElt.getSizeInBits() <= 16)) ||
14992 ((Subtarget->hasDQI() && Subtarget->hasVLX() &&
14993 VT.getSizeInBits() <= 256 && VTElt.getSizeInBits() >= 32)) ||
14995 ((Subtarget->hasDQI() && VT.is512BitVector() &&
14996 VTElt.getSizeInBits() >= 32))))
14997 return DAG.getNode(X86ISD::VSEXT, dl, VT, In);
14999 unsigned int NumElts = VT.getVectorNumElements();
15001 if (NumElts != 8 && NumElts != 16 && !Subtarget->hasBWI())
15004 if (VT.is512BitVector() && InVT.getVectorElementType() != MVT::i1) {
15005 if (In.getOpcode() == X86ISD::VSEXT || In.getOpcode() == X86ISD::VZEXT)
15006 return DAG.getNode(In.getOpcode(), dl, VT, In.getOperand(0));
15007 return DAG.getNode(X86ISD::VSEXT, dl, VT, In);
15010 assert (InVT.getVectorElementType() == MVT::i1 && "Unexpected vector type");
15011 MVT ExtVT = NumElts == 8 ? MVT::v8i64 : MVT::v16i32;
15013 DAG.getConstant(APInt::getAllOnesValue(ExtVT.getScalarSizeInBits()), dl,
15016 DAG.getConstant(APInt::getNullValue(ExtVT.getScalarSizeInBits()), dl, ExtVT);
15018 SDValue V = DAG.getNode(ISD::VSELECT, dl, ExtVT, In, NegOne, Zero);
15019 if (VT.is512BitVector())
15021 return DAG.getNode(X86ISD::VTRUNC, dl, VT, V);
15024 static SDValue LowerSIGN_EXTEND_VECTOR_INREG(SDValue Op,
15025 const X86Subtarget *Subtarget,
15026 SelectionDAG &DAG) {
15027 SDValue In = Op->getOperand(0);
15028 MVT VT = Op->getSimpleValueType(0);
15029 MVT InVT = In.getSimpleValueType();
15030 assert(VT.getSizeInBits() == InVT.getSizeInBits());
15032 MVT InSVT = InVT.getVectorElementType();
15033 assert(VT.getVectorElementType().getSizeInBits() > InSVT.getSizeInBits());
15035 if (VT != MVT::v2i64 && VT != MVT::v4i32 && VT != MVT::v8i16)
15037 if (InSVT != MVT::i32 && InSVT != MVT::i16 && InSVT != MVT::i8)
15042 // SSE41 targets can use the pmovsx* instructions directly.
15043 if (Subtarget->hasSSE41())
15044 return DAG.getNode(X86ISD::VSEXT, dl, VT, In);
15046 // pre-SSE41 targets unpack lower lanes and then sign-extend using SRAI.
15050 // As SRAI is only available on i16/i32 types, we expand only up to i32
15051 // and handle i64 separately.
15052 while (CurrVT != VT && CurrVT.getVectorElementType() != MVT::i32) {
15053 Curr = DAG.getNode(X86ISD::UNPCKL, dl, CurrVT, DAG.getUNDEF(CurrVT), Curr);
15054 MVT CurrSVT = MVT::getIntegerVT(CurrVT.getScalarSizeInBits() * 2);
15055 CurrVT = MVT::getVectorVT(CurrSVT, CurrVT.getVectorNumElements() / 2);
15056 Curr = DAG.getBitcast(CurrVT, Curr);
15059 SDValue SignExt = Curr;
15060 if (CurrVT != InVT) {
15061 unsigned SignExtShift =
15062 CurrVT.getVectorElementType().getSizeInBits() - InSVT.getSizeInBits();
15063 SignExt = DAG.getNode(X86ISD::VSRAI, dl, CurrVT, Curr,
15064 DAG.getConstant(SignExtShift, dl, MVT::i8));
15070 if (VT == MVT::v2i64 && CurrVT == MVT::v4i32) {
15071 SDValue Sign = DAG.getNode(X86ISD::VSRAI, dl, CurrVT, Curr,
15072 DAG.getConstant(31, dl, MVT::i8));
15073 SDValue Ext = DAG.getVectorShuffle(CurrVT, dl, SignExt, Sign, {0, 4, 1, 5});
15074 return DAG.getBitcast(VT, Ext);
15080 static SDValue LowerSIGN_EXTEND(SDValue Op, const X86Subtarget *Subtarget,
15081 SelectionDAG &DAG) {
15082 MVT VT = Op->getSimpleValueType(0);
15083 SDValue In = Op->getOperand(0);
15084 MVT InVT = In.getSimpleValueType();
15087 if (VT.is512BitVector() || InVT.getVectorElementType() == MVT::i1)
15088 return LowerSIGN_EXTEND_AVX512(Op, Subtarget, DAG);
15090 if ((VT != MVT::v4i64 || InVT != MVT::v4i32) &&
15091 (VT != MVT::v8i32 || InVT != MVT::v8i16) &&
15092 (VT != MVT::v16i16 || InVT != MVT::v16i8))
15095 if (Subtarget->hasInt256())
15096 return DAG.getNode(X86ISD::VSEXT, dl, VT, In);
15098 // Optimize vectors in AVX mode
15099 // Sign extend v8i16 to v8i32 and
15102 // Divide input vector into two parts
15103 // for v4i32 the shuffle mask will be { 0, 1, -1, -1} {2, 3, -1, -1}
15104 // use vpmovsx instruction to extend v4i32 -> v2i64; v8i16 -> v4i32
15105 // concat the vectors to original VT
15107 unsigned NumElems = InVT.getVectorNumElements();
15108 SDValue Undef = DAG.getUNDEF(InVT);
15110 SmallVector<int,8> ShufMask1(NumElems, -1);
15111 for (unsigned i = 0; i != NumElems/2; ++i)
15114 SDValue OpLo = DAG.getVectorShuffle(InVT, dl, In, Undef, &ShufMask1[0]);
15116 SmallVector<int,8> ShufMask2(NumElems, -1);
15117 for (unsigned i = 0; i != NumElems/2; ++i)
15118 ShufMask2[i] = i + NumElems/2;
15120 SDValue OpHi = DAG.getVectorShuffle(InVT, dl, In, Undef, &ShufMask2[0]);
15122 MVT HalfVT = MVT::getVectorVT(VT.getVectorElementType(),
15123 VT.getVectorNumElements()/2);
15125 OpLo = DAG.getNode(X86ISD::VSEXT, dl, HalfVT, OpLo);
15126 OpHi = DAG.getNode(X86ISD::VSEXT, dl, HalfVT, OpHi);
15128 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, OpLo, OpHi);
15131 // Lower vector extended loads using a shuffle. If SSSE3 is not available we
15132 // may emit an illegal shuffle but the expansion is still better than scalar
15133 // code. We generate X86ISD::VSEXT for SEXTLOADs if it's available, otherwise
15134 // we'll emit a shuffle and a arithmetic shift.
15135 // FIXME: Is the expansion actually better than scalar code? It doesn't seem so.
15136 // TODO: It is possible to support ZExt by zeroing the undef values during
15137 // the shuffle phase or after the shuffle.
15138 static SDValue LowerExtendedLoad(SDValue Op, const X86Subtarget *Subtarget,
15139 SelectionDAG &DAG) {
15140 MVT RegVT = Op.getSimpleValueType();
15141 assert(RegVT.isVector() && "We only custom lower vector sext loads.");
15142 assert(RegVT.isInteger() &&
15143 "We only custom lower integer vector sext loads.");
15145 // Nothing useful we can do without SSE2 shuffles.
15146 assert(Subtarget->hasSSE2() && "We only custom lower sext loads with SSE2.");
15148 LoadSDNode *Ld = cast<LoadSDNode>(Op.getNode());
15150 EVT MemVT = Ld->getMemoryVT();
15151 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
15152 unsigned RegSz = RegVT.getSizeInBits();
15154 ISD::LoadExtType Ext = Ld->getExtensionType();
15156 assert((Ext == ISD::EXTLOAD || Ext == ISD::SEXTLOAD)
15157 && "Only anyext and sext are currently implemented.");
15158 assert(MemVT != RegVT && "Cannot extend to the same type");
15159 assert(MemVT.isVector() && "Must load a vector from memory");
15161 unsigned NumElems = RegVT.getVectorNumElements();
15162 unsigned MemSz = MemVT.getSizeInBits();
15163 assert(RegSz > MemSz && "Register size must be greater than the mem size");
15165 if (Ext == ISD::SEXTLOAD && RegSz == 256 && !Subtarget->hasInt256()) {
15166 // The only way in which we have a legal 256-bit vector result but not the
15167 // integer 256-bit operations needed to directly lower a sextload is if we
15168 // have AVX1 but not AVX2. In that case, we can always emit a sextload to
15169 // a 128-bit vector and a normal sign_extend to 256-bits that should get
15170 // correctly legalized. We do this late to allow the canonical form of
15171 // sextload to persist throughout the rest of the DAG combiner -- it wants
15172 // to fold together any extensions it can, and so will fuse a sign_extend
15173 // of an sextload into a sextload targeting a wider value.
15175 if (MemSz == 128) {
15176 // Just switch this to a normal load.
15177 assert(TLI.isTypeLegal(MemVT) && "If the memory type is a 128-bit type, "
15178 "it must be a legal 128-bit vector "
15180 Load = DAG.getLoad(MemVT, dl, Ld->getChain(), Ld->getBasePtr(),
15181 Ld->getPointerInfo(), Ld->isVolatile(), Ld->isNonTemporal(),
15182 Ld->isInvariant(), Ld->getAlignment());
15184 assert(MemSz < 128 &&
15185 "Can't extend a type wider than 128 bits to a 256 bit vector!");
15186 // Do an sext load to a 128-bit vector type. We want to use the same
15187 // number of elements, but elements half as wide. This will end up being
15188 // recursively lowered by this routine, but will succeed as we definitely
15189 // have all the necessary features if we're using AVX1.
15191 EVT::getIntegerVT(*DAG.getContext(), RegVT.getScalarSizeInBits() / 2);
15192 EVT HalfVecVT = EVT::getVectorVT(*DAG.getContext(), HalfEltVT, NumElems);
15194 DAG.getExtLoad(Ext, dl, HalfVecVT, Ld->getChain(), Ld->getBasePtr(),
15195 Ld->getPointerInfo(), MemVT, Ld->isVolatile(),
15196 Ld->isNonTemporal(), Ld->isInvariant(),
15197 Ld->getAlignment());
15200 // Replace chain users with the new chain.
15201 assert(Load->getNumValues() == 2 && "Loads must carry a chain!");
15202 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), Load.getValue(1));
15204 // Finally, do a normal sign-extend to the desired register.
15205 return DAG.getSExtOrTrunc(Load, dl, RegVT);
15208 // All sizes must be a power of two.
15209 assert(isPowerOf2_32(RegSz * MemSz * NumElems) &&
15210 "Non-power-of-two elements are not custom lowered!");
15212 // Attempt to load the original value using scalar loads.
15213 // Find the largest scalar type that divides the total loaded size.
15214 MVT SclrLoadTy = MVT::i8;
15215 for (MVT Tp : MVT::integer_valuetypes()) {
15216 if (TLI.isTypeLegal(Tp) && ((MemSz % Tp.getSizeInBits()) == 0)) {
15221 // On 32bit systems, we can't save 64bit integers. Try bitcasting to F64.
15222 if (TLI.isTypeLegal(MVT::f64) && SclrLoadTy.getSizeInBits() < 64 &&
15224 SclrLoadTy = MVT::f64;
15226 // Calculate the number of scalar loads that we need to perform
15227 // in order to load our vector from memory.
15228 unsigned NumLoads = MemSz / SclrLoadTy.getSizeInBits();
15230 assert((Ext != ISD::SEXTLOAD || NumLoads == 1) &&
15231 "Can only lower sext loads with a single scalar load!");
15233 unsigned loadRegZize = RegSz;
15234 if (Ext == ISD::SEXTLOAD && RegSz >= 256)
15237 // Represent our vector as a sequence of elements which are the
15238 // largest scalar that we can load.
15239 EVT LoadUnitVecVT = EVT::getVectorVT(
15240 *DAG.getContext(), SclrLoadTy, loadRegZize / SclrLoadTy.getSizeInBits());
15242 // Represent the data using the same element type that is stored in
15243 // memory. In practice, we ''widen'' MemVT.
15245 EVT::getVectorVT(*DAG.getContext(), MemVT.getScalarType(),
15246 loadRegZize / MemVT.getScalarSizeInBits());
15248 assert(WideVecVT.getSizeInBits() == LoadUnitVecVT.getSizeInBits() &&
15249 "Invalid vector type");
15251 // We can't shuffle using an illegal type.
15252 assert(TLI.isTypeLegal(WideVecVT) &&
15253 "We only lower types that form legal widened vector types");
15255 SmallVector<SDValue, 8> Chains;
15256 SDValue Ptr = Ld->getBasePtr();
15257 SDValue Increment = DAG.getConstant(SclrLoadTy.getSizeInBits() / 8, dl,
15258 TLI.getPointerTy(DAG.getDataLayout()));
15259 SDValue Res = DAG.getUNDEF(LoadUnitVecVT);
15261 for (unsigned i = 0; i < NumLoads; ++i) {
15262 // Perform a single load.
15263 SDValue ScalarLoad =
15264 DAG.getLoad(SclrLoadTy, dl, Ld->getChain(), Ptr, Ld->getPointerInfo(),
15265 Ld->isVolatile(), Ld->isNonTemporal(), Ld->isInvariant(),
15266 Ld->getAlignment());
15267 Chains.push_back(ScalarLoad.getValue(1));
15268 // Create the first element type using SCALAR_TO_VECTOR in order to avoid
15269 // another round of DAGCombining.
15271 Res = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, LoadUnitVecVT, ScalarLoad);
15273 Res = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, LoadUnitVecVT, Res,
15274 ScalarLoad, DAG.getIntPtrConstant(i, dl));
15276 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
15279 SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Chains);
15281 // Bitcast the loaded value to a vector of the original element type, in
15282 // the size of the target vector type.
15283 SDValue SlicedVec = DAG.getBitcast(WideVecVT, Res);
15284 unsigned SizeRatio = RegSz / MemSz;
15286 if (Ext == ISD::SEXTLOAD) {
15287 // If we have SSE4.1, we can directly emit a VSEXT node.
15288 if (Subtarget->hasSSE41()) {
15289 SDValue Sext = DAG.getNode(X86ISD::VSEXT, dl, RegVT, SlicedVec);
15290 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), TF);
15294 // Otherwise we'll use SIGN_EXTEND_VECTOR_INREG to sign extend the lowest
15296 assert(TLI.isOperationLegalOrCustom(ISD::SIGN_EXTEND_VECTOR_INREG, RegVT) &&
15297 "We can't implement a sext load without SIGN_EXTEND_VECTOR_INREG!");
15299 SDValue Shuff = DAG.getSignExtendVectorInReg(SlicedVec, dl, RegVT);
15300 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), TF);
15304 // Redistribute the loaded elements into the different locations.
15305 SmallVector<int, 16> ShuffleVec(NumElems * SizeRatio, -1);
15306 for (unsigned i = 0; i != NumElems; ++i)
15307 ShuffleVec[i * SizeRatio] = i;
15309 SDValue Shuff = DAG.getVectorShuffle(WideVecVT, dl, SlicedVec,
15310 DAG.getUNDEF(WideVecVT), &ShuffleVec[0]);
15312 // Bitcast to the requested type.
15313 Shuff = DAG.getBitcast(RegVT, Shuff);
15314 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), TF);
15318 // isAndOrOfSingleUseSetCCs - Return true if node is an ISD::AND or
15319 // ISD::OR of two X86ISD::SETCC nodes each of which has no other use apart
15320 // from the AND / OR.
15321 static bool isAndOrOfSetCCs(SDValue Op, unsigned &Opc) {
15322 Opc = Op.getOpcode();
15323 if (Opc != ISD::OR && Opc != ISD::AND)
15325 return (Op.getOperand(0).getOpcode() == X86ISD::SETCC &&
15326 Op.getOperand(0).hasOneUse() &&
15327 Op.getOperand(1).getOpcode() == X86ISD::SETCC &&
15328 Op.getOperand(1).hasOneUse());
15331 // isXor1OfSetCC - Return true if node is an ISD::XOR of a X86ISD::SETCC and
15332 // 1 and that the SETCC node has a single use.
15333 static bool isXor1OfSetCC(SDValue Op) {
15334 if (Op.getOpcode() != ISD::XOR)
15336 if (isOneConstant(Op.getOperand(1)))
15337 return Op.getOperand(0).getOpcode() == X86ISD::SETCC &&
15338 Op.getOperand(0).hasOneUse();
15342 SDValue X86TargetLowering::LowerBRCOND(SDValue Op, SelectionDAG &DAG) const {
15343 bool addTest = true;
15344 SDValue Chain = Op.getOperand(0);
15345 SDValue Cond = Op.getOperand(1);
15346 SDValue Dest = Op.getOperand(2);
15349 bool Inverted = false;
15351 if (Cond.getOpcode() == ISD::SETCC) {
15352 // Check for setcc([su]{add,sub,mul}o == 0).
15353 if (cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETEQ &&
15354 isNullConstant(Cond.getOperand(1)) &&
15355 Cond.getOperand(0).getResNo() == 1 &&
15356 (Cond.getOperand(0).getOpcode() == ISD::SADDO ||
15357 Cond.getOperand(0).getOpcode() == ISD::UADDO ||
15358 Cond.getOperand(0).getOpcode() == ISD::SSUBO ||
15359 Cond.getOperand(0).getOpcode() == ISD::USUBO ||
15360 Cond.getOperand(0).getOpcode() == ISD::SMULO ||
15361 Cond.getOperand(0).getOpcode() == ISD::UMULO)) {
15363 Cond = Cond.getOperand(0);
15365 SDValue NewCond = LowerSETCC(Cond, DAG);
15366 if (NewCond.getNode())
15371 // FIXME: LowerXALUO doesn't handle these!!
15372 else if (Cond.getOpcode() == X86ISD::ADD ||
15373 Cond.getOpcode() == X86ISD::SUB ||
15374 Cond.getOpcode() == X86ISD::SMUL ||
15375 Cond.getOpcode() == X86ISD::UMUL)
15376 Cond = LowerXALUO(Cond, DAG);
15379 // Look pass (and (setcc_carry (cmp ...)), 1).
15380 if (Cond.getOpcode() == ISD::AND &&
15381 Cond.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY &&
15382 isOneConstant(Cond.getOperand(1)))
15383 Cond = Cond.getOperand(0);
15385 // If condition flag is set by a X86ISD::CMP, then use it as the condition
15386 // setting operand in place of the X86ISD::SETCC.
15387 unsigned CondOpcode = Cond.getOpcode();
15388 if (CondOpcode == X86ISD::SETCC ||
15389 CondOpcode == X86ISD::SETCC_CARRY) {
15390 CC = Cond.getOperand(0);
15392 SDValue Cmp = Cond.getOperand(1);
15393 unsigned Opc = Cmp.getOpcode();
15394 // FIXME: WHY THE SPECIAL CASING OF LogicalCmp??
15395 if (isX86LogicalCmp(Cmp) || Opc == X86ISD::BT) {
15399 switch (cast<ConstantSDNode>(CC)->getZExtValue()) {
15403 // These can only come from an arithmetic instruction with overflow,
15404 // e.g. SADDO, UADDO.
15405 Cond = Cond.getNode()->getOperand(1);
15411 CondOpcode = Cond.getOpcode();
15412 if (CondOpcode == ISD::UADDO || CondOpcode == ISD::SADDO ||
15413 CondOpcode == ISD::USUBO || CondOpcode == ISD::SSUBO ||
15414 ((CondOpcode == ISD::UMULO || CondOpcode == ISD::SMULO) &&
15415 Cond.getOperand(0).getValueType() != MVT::i8)) {
15416 SDValue LHS = Cond.getOperand(0);
15417 SDValue RHS = Cond.getOperand(1);
15418 unsigned X86Opcode;
15421 // Keep this in sync with LowerXALUO, otherwise we might create redundant
15422 // instructions that can't be removed afterwards (i.e. X86ISD::ADD and
15424 switch (CondOpcode) {
15425 case ISD::UADDO: X86Opcode = X86ISD::ADD; X86Cond = X86::COND_B; break;
15427 if (isOneConstant(RHS)) {
15428 X86Opcode = X86ISD::INC; X86Cond = X86::COND_O;
15431 X86Opcode = X86ISD::ADD; X86Cond = X86::COND_O; break;
15432 case ISD::USUBO: X86Opcode = X86ISD::SUB; X86Cond = X86::COND_B; break;
15434 if (isOneConstant(RHS)) {
15435 X86Opcode = X86ISD::DEC; X86Cond = X86::COND_O;
15438 X86Opcode = X86ISD::SUB; X86Cond = X86::COND_O; break;
15439 case ISD::UMULO: X86Opcode = X86ISD::UMUL; X86Cond = X86::COND_O; break;
15440 case ISD::SMULO: X86Opcode = X86ISD::SMUL; X86Cond = X86::COND_O; break;
15441 default: llvm_unreachable("unexpected overflowing operator");
15444 X86Cond = X86::GetOppositeBranchCondition((X86::CondCode)X86Cond);
15445 if (CondOpcode == ISD::UMULO)
15446 VTs = DAG.getVTList(LHS.getValueType(), LHS.getValueType(),
15449 VTs = DAG.getVTList(LHS.getValueType(), MVT::i32);
15451 SDValue X86Op = DAG.getNode(X86Opcode, dl, VTs, LHS, RHS);
15453 if (CondOpcode == ISD::UMULO)
15454 Cond = X86Op.getValue(2);
15456 Cond = X86Op.getValue(1);
15458 CC = DAG.getConstant(X86Cond, dl, MVT::i8);
15462 if (Cond.hasOneUse() && isAndOrOfSetCCs(Cond, CondOpc)) {
15463 SDValue Cmp = Cond.getOperand(0).getOperand(1);
15464 if (CondOpc == ISD::OR) {
15465 // Also, recognize the pattern generated by an FCMP_UNE. We can emit
15466 // two branches instead of an explicit OR instruction with a
15468 if (Cmp == Cond.getOperand(1).getOperand(1) &&
15469 isX86LogicalCmp(Cmp)) {
15470 CC = Cond.getOperand(0).getOperand(0);
15471 Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15472 Chain, Dest, CC, Cmp);
15473 CC = Cond.getOperand(1).getOperand(0);
15477 } else { // ISD::AND
15478 // Also, recognize the pattern generated by an FCMP_OEQ. We can emit
15479 // two branches instead of an explicit AND instruction with a
15480 // separate test. However, we only do this if this block doesn't
15481 // have a fall-through edge, because this requires an explicit
15482 // jmp when the condition is false.
15483 if (Cmp == Cond.getOperand(1).getOperand(1) &&
15484 isX86LogicalCmp(Cmp) &&
15485 Op.getNode()->hasOneUse()) {
15486 X86::CondCode CCode =
15487 (X86::CondCode)Cond.getOperand(0).getConstantOperandVal(0);
15488 CCode = X86::GetOppositeBranchCondition(CCode);
15489 CC = DAG.getConstant(CCode, dl, MVT::i8);
15490 SDNode *User = *Op.getNode()->use_begin();
15491 // Look for an unconditional branch following this conditional branch.
15492 // We need this because we need to reverse the successors in order
15493 // to implement FCMP_OEQ.
15494 if (User->getOpcode() == ISD::BR) {
15495 SDValue FalseBB = User->getOperand(1);
15497 DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
15498 assert(NewBR == User);
15502 Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15503 Chain, Dest, CC, Cmp);
15504 X86::CondCode CCode =
15505 (X86::CondCode)Cond.getOperand(1).getConstantOperandVal(0);
15506 CCode = X86::GetOppositeBranchCondition(CCode);
15507 CC = DAG.getConstant(CCode, dl, MVT::i8);
15513 } else if (Cond.hasOneUse() && isXor1OfSetCC(Cond)) {
15514 // Recognize for xorb (setcc), 1 patterns. The xor inverts the condition.
15515 // It should be transformed during dag combiner except when the condition
15516 // is set by a arithmetics with overflow node.
15517 X86::CondCode CCode =
15518 (X86::CondCode)Cond.getOperand(0).getConstantOperandVal(0);
15519 CCode = X86::GetOppositeBranchCondition(CCode);
15520 CC = DAG.getConstant(CCode, dl, MVT::i8);
15521 Cond = Cond.getOperand(0).getOperand(1);
15523 } else if (Cond.getOpcode() == ISD::SETCC &&
15524 cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETOEQ) {
15525 // For FCMP_OEQ, we can emit
15526 // two branches instead of an explicit AND instruction with a
15527 // separate test. However, we only do this if this block doesn't
15528 // have a fall-through edge, because this requires an explicit
15529 // jmp when the condition is false.
15530 if (Op.getNode()->hasOneUse()) {
15531 SDNode *User = *Op.getNode()->use_begin();
15532 // Look for an unconditional branch following this conditional branch.
15533 // We need this because we need to reverse the successors in order
15534 // to implement FCMP_OEQ.
15535 if (User->getOpcode() == ISD::BR) {
15536 SDValue FalseBB = User->getOperand(1);
15538 DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
15539 assert(NewBR == User);
15543 SDValue Cmp = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
15544 Cond.getOperand(0), Cond.getOperand(1));
15545 Cmp = ConvertCmpIfNecessary(Cmp, DAG);
15546 CC = DAG.getConstant(X86::COND_NE, dl, MVT::i8);
15547 Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15548 Chain, Dest, CC, Cmp);
15549 CC = DAG.getConstant(X86::COND_P, dl, MVT::i8);
15554 } else if (Cond.getOpcode() == ISD::SETCC &&
15555 cast<CondCodeSDNode>(Cond.getOperand(2))->get() == ISD::SETUNE) {
15556 // For FCMP_UNE, we can emit
15557 // two branches instead of an explicit AND instruction with a
15558 // separate test. However, we only do this if this block doesn't
15559 // have a fall-through edge, because this requires an explicit
15560 // jmp when the condition is false.
15561 if (Op.getNode()->hasOneUse()) {
15562 SDNode *User = *Op.getNode()->use_begin();
15563 // Look for an unconditional branch following this conditional branch.
15564 // We need this because we need to reverse the successors in order
15565 // to implement FCMP_UNE.
15566 if (User->getOpcode() == ISD::BR) {
15567 SDValue FalseBB = User->getOperand(1);
15569 DAG.UpdateNodeOperands(User, User->getOperand(0), Dest);
15570 assert(NewBR == User);
15573 SDValue Cmp = DAG.getNode(X86ISD::CMP, dl, MVT::i32,
15574 Cond.getOperand(0), Cond.getOperand(1));
15575 Cmp = ConvertCmpIfNecessary(Cmp, DAG);
15576 CC = DAG.getConstant(X86::COND_NE, dl, MVT::i8);
15577 Chain = DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15578 Chain, Dest, CC, Cmp);
15579 CC = DAG.getConstant(X86::COND_NP, dl, MVT::i8);
15589 // Look pass the truncate if the high bits are known zero.
15590 if (isTruncWithZeroHighBitsInput(Cond, DAG))
15591 Cond = Cond.getOperand(0);
15593 // We know the result of AND is compared against zero. Try to match
15595 if (Cond.getOpcode() == ISD::AND && Cond.hasOneUse()) {
15596 if (SDValue NewSetCC = LowerToBT(Cond, ISD::SETNE, dl, DAG)) {
15597 CC = NewSetCC.getOperand(0);
15598 Cond = NewSetCC.getOperand(1);
15605 X86::CondCode X86Cond = Inverted ? X86::COND_E : X86::COND_NE;
15606 CC = DAG.getConstant(X86Cond, dl, MVT::i8);
15607 Cond = EmitTest(Cond, X86Cond, dl, DAG);
15609 Cond = ConvertCmpIfNecessary(Cond, DAG);
15610 return DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
15611 Chain, Dest, CC, Cond);
15614 // Lower dynamic stack allocation to _alloca call for Cygwin/Mingw targets.
15615 // Calls to _alloca are needed to probe the stack when allocating more than 4k
15616 // bytes in one go. Touching the stack at 4K increments is necessary to ensure
15617 // that the guard pages used by the OS virtual memory manager are allocated in
15618 // correct sequence.
15620 X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
15621 SelectionDAG &DAG) const {
15622 MachineFunction &MF = DAG.getMachineFunction();
15623 bool SplitStack = MF.shouldSplitStack();
15624 bool Lower = (Subtarget->isOSWindows() && !Subtarget->isTargetMachO()) ||
15629 SDNode *Node = Op.getNode();
15630 SDValue Chain = Op.getOperand(0);
15631 SDValue Size = Op.getOperand(1);
15632 unsigned Align = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue();
15633 EVT VT = Node->getValueType(0);
15635 // Chain the dynamic stack allocation so that it doesn't modify the stack
15636 // pointer when other instructions are using the stack.
15637 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, dl, true), dl);
15639 bool Is64Bit = Subtarget->is64Bit();
15640 MVT SPTy = getPointerTy(DAG.getDataLayout());
15644 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
15645 unsigned SPReg = TLI.getStackPointerRegisterToSaveRestore();
15646 assert(SPReg && "Target cannot require DYNAMIC_STACKALLOC expansion and"
15647 " not tell us which reg is the stack pointer!");
15648 EVT VT = Node->getValueType(0);
15649 SDValue Tmp3 = Node->getOperand(2);
15651 SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, VT);
15652 Chain = SP.getValue(1);
15653 unsigned Align = cast<ConstantSDNode>(Tmp3)->getZExtValue();
15654 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
15655 unsigned StackAlign = TFI.getStackAlignment();
15656 Result = DAG.getNode(ISD::SUB, dl, VT, SP, Size); // Value
15657 if (Align > StackAlign)
15658 Result = DAG.getNode(ISD::AND, dl, VT, Result,
15659 DAG.getConstant(-(uint64_t)Align, dl, VT));
15660 Chain = DAG.getCopyToReg(Chain, dl, SPReg, Result); // Output chain
15661 } else if (SplitStack) {
15662 MachineRegisterInfo &MRI = MF.getRegInfo();
15665 // The 64 bit implementation of segmented stacks needs to clobber both r10
15666 // r11. This makes it impossible to use it along with nested parameters.
15667 const Function *F = MF.getFunction();
15669 for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
15671 if (I->hasNestAttr())
15672 report_fatal_error("Cannot use segmented stacks with functions that "
15673 "have nested arguments.");
15676 const TargetRegisterClass *AddrRegClass = getRegClassFor(SPTy);
15677 unsigned Vreg = MRI.createVirtualRegister(AddrRegClass);
15678 Chain = DAG.getCopyToReg(Chain, dl, Vreg, Size);
15679 Result = DAG.getNode(X86ISD::SEG_ALLOCA, dl, SPTy, Chain,
15680 DAG.getRegister(Vreg, SPTy));
15683 const unsigned Reg = (Subtarget->isTarget64BitLP64() ? X86::RAX : X86::EAX);
15685 Chain = DAG.getCopyToReg(Chain, dl, Reg, Size, Flag);
15686 Flag = Chain.getValue(1);
15687 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
15689 Chain = DAG.getNode(X86ISD::WIN_ALLOCA, dl, NodeTys, Chain, Flag);
15691 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
15692 unsigned SPReg = RegInfo->getStackRegister();
15693 SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, SPTy);
15694 Chain = SP.getValue(1);
15697 SP = DAG.getNode(ISD::AND, dl, VT, SP.getValue(0),
15698 DAG.getConstant(-(uint64_t)Align, dl, VT));
15699 Chain = DAG.getCopyToReg(Chain, dl, SPReg, SP);
15705 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, dl, true),
15706 DAG.getIntPtrConstant(0, dl, true), SDValue(), dl);
15708 SDValue Ops[2] = {Result, Chain};
15709 return DAG.getMergeValues(Ops, dl);
15712 SDValue X86TargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
15713 MachineFunction &MF = DAG.getMachineFunction();
15714 auto PtrVT = getPointerTy(MF.getDataLayout());
15715 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
15717 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
15720 if (!Subtarget->is64Bit() ||
15721 Subtarget->isCallingConvWin64(MF.getFunction()->getCallingConv())) {
15722 // vastart just stores the address of the VarArgsFrameIndex slot into the
15723 // memory location argument.
15724 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
15725 return DAG.getStore(Op.getOperand(0), DL, FR, Op.getOperand(1),
15726 MachinePointerInfo(SV), false, false, 0);
15730 // gp_offset (0 - 6 * 8)
15731 // fp_offset (48 - 48 + 8 * 16)
15732 // overflow_arg_area (point to parameters coming in memory).
15734 SmallVector<SDValue, 8> MemOps;
15735 SDValue FIN = Op.getOperand(1);
15737 SDValue Store = DAG.getStore(Op.getOperand(0), DL,
15738 DAG.getConstant(FuncInfo->getVarArgsGPOffset(),
15740 FIN, MachinePointerInfo(SV), false, false, 0);
15741 MemOps.push_back(Store);
15744 FIN = DAG.getNode(ISD::ADD, DL, PtrVT, FIN, DAG.getIntPtrConstant(4, DL));
15745 Store = DAG.getStore(Op.getOperand(0), DL,
15746 DAG.getConstant(FuncInfo->getVarArgsFPOffset(), DL,
15748 FIN, MachinePointerInfo(SV, 4), false, false, 0);
15749 MemOps.push_back(Store);
15751 // Store ptr to overflow_arg_area
15752 FIN = DAG.getNode(ISD::ADD, DL, PtrVT, FIN, DAG.getIntPtrConstant(4, DL));
15753 SDValue OVFIN = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
15754 Store = DAG.getStore(Op.getOperand(0), DL, OVFIN, FIN,
15755 MachinePointerInfo(SV, 8),
15757 MemOps.push_back(Store);
15759 // Store ptr to reg_save_area.
15760 FIN = DAG.getNode(ISD::ADD, DL, PtrVT, FIN, DAG.getIntPtrConstant(
15761 Subtarget->isTarget64BitLP64() ? 8 : 4, DL));
15762 SDValue RSFIN = DAG.getFrameIndex(FuncInfo->getRegSaveFrameIndex(), PtrVT);
15763 Store = DAG.getStore(Op.getOperand(0), DL, RSFIN, FIN, MachinePointerInfo(
15764 SV, Subtarget->isTarget64BitLP64() ? 16 : 12), false, false, 0);
15765 MemOps.push_back(Store);
15766 return DAG.getNode(ISD::TokenFactor, DL, MVT::Other, MemOps);
15769 SDValue X86TargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG) const {
15770 assert(Subtarget->is64Bit() &&
15771 "LowerVAARG only handles 64-bit va_arg!");
15772 assert(Op.getNode()->getNumOperands() == 4);
15774 MachineFunction &MF = DAG.getMachineFunction();
15775 if (Subtarget->isCallingConvWin64(MF.getFunction()->getCallingConv()))
15776 // The Win64 ABI uses char* instead of a structure.
15777 return DAG.expandVAArg(Op.getNode());
15779 SDValue Chain = Op.getOperand(0);
15780 SDValue SrcPtr = Op.getOperand(1);
15781 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
15782 unsigned Align = Op.getConstantOperandVal(3);
15785 EVT ArgVT = Op.getNode()->getValueType(0);
15786 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
15787 uint32_t ArgSize = DAG.getDataLayout().getTypeAllocSize(ArgTy);
15790 // Decide which area this value should be read from.
15791 // TODO: Implement the AMD64 ABI in its entirety. This simple
15792 // selection mechanism works only for the basic types.
15793 if (ArgVT == MVT::f80) {
15794 llvm_unreachable("va_arg for f80 not yet implemented");
15795 } else if (ArgVT.isFloatingPoint() && ArgSize <= 16 /*bytes*/) {
15796 ArgMode = 2; // Argument passed in XMM register. Use fp_offset.
15797 } else if (ArgVT.isInteger() && ArgSize <= 32 /*bytes*/) {
15798 ArgMode = 1; // Argument passed in GPR64 register(s). Use gp_offset.
15800 llvm_unreachable("Unhandled argument type in LowerVAARG");
15803 if (ArgMode == 2) {
15804 // Sanity Check: Make sure using fp_offset makes sense.
15805 assert(!Subtarget->useSoftFloat() &&
15806 !(MF.getFunction()->hasFnAttribute(Attribute::NoImplicitFloat)) &&
15807 Subtarget->hasSSE1());
15810 // Insert VAARG_64 node into the DAG
15811 // VAARG_64 returns two values: Variable Argument Address, Chain
15812 SDValue InstOps[] = {Chain, SrcPtr, DAG.getConstant(ArgSize, dl, MVT::i32),
15813 DAG.getConstant(ArgMode, dl, MVT::i8),
15814 DAG.getConstant(Align, dl, MVT::i32)};
15815 SDVTList VTs = DAG.getVTList(getPointerTy(DAG.getDataLayout()), MVT::Other);
15816 SDValue VAARG = DAG.getMemIntrinsicNode(X86ISD::VAARG_64, dl,
15817 VTs, InstOps, MVT::i64,
15818 MachinePointerInfo(SV),
15820 /*Volatile=*/false,
15822 /*WriteMem=*/true);
15823 Chain = VAARG.getValue(1);
15825 // Load the next argument and return it
15826 return DAG.getLoad(ArgVT, dl,
15829 MachinePointerInfo(),
15830 false, false, false, 0);
15833 static SDValue LowerVACOPY(SDValue Op, const X86Subtarget *Subtarget,
15834 SelectionDAG &DAG) {
15835 // X86-64 va_list is a struct { i32, i32, i8*, i8* }, except on Windows,
15836 // where a va_list is still an i8*.
15837 assert(Subtarget->is64Bit() && "This code only handles 64-bit va_copy!");
15838 if (Subtarget->isCallingConvWin64(
15839 DAG.getMachineFunction().getFunction()->getCallingConv()))
15840 // Probably a Win64 va_copy.
15841 return DAG.expandVACopy(Op.getNode());
15843 SDValue Chain = Op.getOperand(0);
15844 SDValue DstPtr = Op.getOperand(1);
15845 SDValue SrcPtr = Op.getOperand(2);
15846 const Value *DstSV = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
15847 const Value *SrcSV = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
15850 return DAG.getMemcpy(Chain, DL, DstPtr, SrcPtr,
15851 DAG.getIntPtrConstant(24, DL), 8, /*isVolatile*/false,
15853 MachinePointerInfo(DstSV), MachinePointerInfo(SrcSV));
15856 // getTargetVShiftByConstNode - Handle vector element shifts where the shift
15857 // amount is a constant. Takes immediate version of shift as input.
15858 static SDValue getTargetVShiftByConstNode(unsigned Opc, SDLoc dl, MVT VT,
15859 SDValue SrcOp, uint64_t ShiftAmt,
15860 SelectionDAG &DAG) {
15861 MVT ElementType = VT.getVectorElementType();
15863 // Fold this packed shift into its first operand if ShiftAmt is 0.
15867 // Check for ShiftAmt >= element width
15868 if (ShiftAmt >= ElementType.getSizeInBits()) {
15869 if (Opc == X86ISD::VSRAI)
15870 ShiftAmt = ElementType.getSizeInBits() - 1;
15872 return DAG.getConstant(0, dl, VT);
15875 assert((Opc == X86ISD::VSHLI || Opc == X86ISD::VSRLI || Opc == X86ISD::VSRAI)
15876 && "Unknown target vector shift-by-constant node");
15878 // Fold this packed vector shift into a build vector if SrcOp is a
15879 // vector of Constants or UNDEFs, and SrcOp valuetype is the same as VT.
15880 if (VT == SrcOp.getSimpleValueType() &&
15881 ISD::isBuildVectorOfConstantSDNodes(SrcOp.getNode())) {
15882 SmallVector<SDValue, 8> Elts;
15883 unsigned NumElts = SrcOp->getNumOperands();
15884 ConstantSDNode *ND;
15887 default: llvm_unreachable(nullptr);
15888 case X86ISD::VSHLI:
15889 for (unsigned i=0; i!=NumElts; ++i) {
15890 SDValue CurrentOp = SrcOp->getOperand(i);
15891 if (CurrentOp->getOpcode() == ISD::UNDEF) {
15892 Elts.push_back(CurrentOp);
15895 ND = cast<ConstantSDNode>(CurrentOp);
15896 const APInt &C = ND->getAPIntValue();
15897 Elts.push_back(DAG.getConstant(C.shl(ShiftAmt), dl, ElementType));
15900 case X86ISD::VSRLI:
15901 for (unsigned i=0; i!=NumElts; ++i) {
15902 SDValue CurrentOp = SrcOp->getOperand(i);
15903 if (CurrentOp->getOpcode() == ISD::UNDEF) {
15904 Elts.push_back(CurrentOp);
15907 ND = cast<ConstantSDNode>(CurrentOp);
15908 const APInt &C = ND->getAPIntValue();
15909 Elts.push_back(DAG.getConstant(C.lshr(ShiftAmt), dl, ElementType));
15912 case X86ISD::VSRAI:
15913 for (unsigned i=0; i!=NumElts; ++i) {
15914 SDValue CurrentOp = SrcOp->getOperand(i);
15915 if (CurrentOp->getOpcode() == ISD::UNDEF) {
15916 Elts.push_back(CurrentOp);
15919 ND = cast<ConstantSDNode>(CurrentOp);
15920 const APInt &C = ND->getAPIntValue();
15921 Elts.push_back(DAG.getConstant(C.ashr(ShiftAmt), dl, ElementType));
15926 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Elts);
15929 return DAG.getNode(Opc, dl, VT, SrcOp,
15930 DAG.getConstant(ShiftAmt, dl, MVT::i8));
15933 // getTargetVShiftNode - Handle vector element shifts where the shift amount
15934 // may or may not be a constant. Takes immediate version of shift as input.
15935 static SDValue getTargetVShiftNode(unsigned Opc, SDLoc dl, MVT VT,
15936 SDValue SrcOp, SDValue ShAmt,
15937 SelectionDAG &DAG) {
15938 MVT SVT = ShAmt.getSimpleValueType();
15939 assert((SVT == MVT::i32 || SVT == MVT::i64) && "Unexpected value type!");
15941 // Catch shift-by-constant.
15942 if (ConstantSDNode *CShAmt = dyn_cast<ConstantSDNode>(ShAmt))
15943 return getTargetVShiftByConstNode(Opc, dl, VT, SrcOp,
15944 CShAmt->getZExtValue(), DAG);
15946 // Change opcode to non-immediate version
15948 default: llvm_unreachable("Unknown target vector shift node");
15949 case X86ISD::VSHLI: Opc = X86ISD::VSHL; break;
15950 case X86ISD::VSRLI: Opc = X86ISD::VSRL; break;
15951 case X86ISD::VSRAI: Opc = X86ISD::VSRA; break;
15954 const X86Subtarget &Subtarget =
15955 static_cast<const X86Subtarget &>(DAG.getSubtarget());
15956 if (Subtarget.hasSSE41() && ShAmt.getOpcode() == ISD::ZERO_EXTEND &&
15957 ShAmt.getOperand(0).getSimpleValueType() == MVT::i16) {
15958 // Let the shuffle legalizer expand this shift amount node.
15959 SDValue Op0 = ShAmt.getOperand(0);
15960 Op0 = DAG.getNode(ISD::SCALAR_TO_VECTOR, SDLoc(Op0), MVT::v8i16, Op0);
15961 ShAmt = getShuffleVectorZeroOrUndef(Op0, 0, true, &Subtarget, DAG);
15963 // Need to build a vector containing shift amount.
15964 // SSE/AVX packed shifts only use the lower 64-bit of the shift count.
15965 SmallVector<SDValue, 4> ShOps;
15966 ShOps.push_back(ShAmt);
15967 if (SVT == MVT::i32) {
15968 ShOps.push_back(DAG.getConstant(0, dl, SVT));
15969 ShOps.push_back(DAG.getUNDEF(SVT));
15971 ShOps.push_back(DAG.getUNDEF(SVT));
15973 MVT BVT = SVT == MVT::i32 ? MVT::v4i32 : MVT::v2i64;
15974 ShAmt = DAG.getNode(ISD::BUILD_VECTOR, dl, BVT, ShOps);
15977 // The return type has to be a 128-bit type with the same element
15978 // type as the input type.
15979 MVT EltVT = VT.getVectorElementType();
15980 MVT ShVT = MVT::getVectorVT(EltVT, 128/EltVT.getSizeInBits());
15982 ShAmt = DAG.getBitcast(ShVT, ShAmt);
15983 return DAG.getNode(Opc, dl, VT, SrcOp, ShAmt);
15986 /// \brief Return (and \p Op, \p Mask) for compare instructions or
15987 /// (vselect \p Mask, \p Op, \p PreservedSrc) for others along with the
15988 /// necessary casting or extending for \p Mask when lowering masking intrinsics
15989 static SDValue getVectorMaskingNode(SDValue Op, SDValue Mask,
15990 SDValue PreservedSrc,
15991 const X86Subtarget *Subtarget,
15992 SelectionDAG &DAG) {
15993 MVT VT = Op.getSimpleValueType();
15994 MVT MaskVT = MVT::getVectorVT(MVT::i1, VT.getVectorNumElements());
15996 unsigned OpcodeSelect = ISD::VSELECT;
15999 if (isAllOnesConstant(Mask))
16002 if (MaskVT.bitsGT(Mask.getSimpleValueType())) {
16003 MVT newMaskVT = MVT::getIntegerVT(MaskVT.getSizeInBits());
16004 VMask = DAG.getBitcast(MaskVT,
16005 DAG.getNode(ISD::ANY_EXTEND, dl, newMaskVT, Mask));
16007 MVT BitcastVT = MVT::getVectorVT(MVT::i1,
16008 Mask.getSimpleValueType().getSizeInBits());
16009 // In case when MaskVT equals v2i1 or v4i1, low 2 or 4 elements
16010 // are extracted by EXTRACT_SUBVECTOR.
16011 VMask = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
16012 DAG.getBitcast(BitcastVT, Mask),
16013 DAG.getIntPtrConstant(0, dl));
16016 switch (Op.getOpcode()) {
16018 case X86ISD::PCMPEQM:
16019 case X86ISD::PCMPGTM:
16021 case X86ISD::CMPMU:
16022 return DAG.getNode(ISD::AND, dl, VT, Op, VMask);
16023 case X86ISD::VFPCLASS:
16024 case X86ISD::VFPCLASSS:
16025 return DAG.getNode(ISD::OR, dl, VT, Op, VMask);
16026 case X86ISD::VTRUNC:
16027 case X86ISD::VTRUNCS:
16028 case X86ISD::VTRUNCUS:
16029 // We can't use ISD::VSELECT here because it is not always "Legal"
16030 // for the destination type. For example vpmovqb require only AVX512
16031 // and vselect that can operate on byte element type require BWI
16032 OpcodeSelect = X86ISD::SELECT;
16035 if (PreservedSrc.getOpcode() == ISD::UNDEF)
16036 PreservedSrc = getZeroVector(VT, Subtarget, DAG, dl);
16037 return DAG.getNode(OpcodeSelect, dl, VT, VMask, Op, PreservedSrc);
16040 /// \brief Creates an SDNode for a predicated scalar operation.
16041 /// \returns (X86vselect \p Mask, \p Op, \p PreservedSrc).
16042 /// The mask is coming as MVT::i8 and it should be truncated
16043 /// to MVT::i1 while lowering masking intrinsics.
16044 /// The main difference between ScalarMaskingNode and VectorMaskingNode is using
16045 /// "X86select" instead of "vselect". We just can't create the "vselect" node
16046 /// for a scalar instruction.
16047 static SDValue getScalarMaskingNode(SDValue Op, SDValue Mask,
16048 SDValue PreservedSrc,
16049 const X86Subtarget *Subtarget,
16050 SelectionDAG &DAG) {
16051 if (isAllOnesConstant(Mask))
16054 MVT VT = Op.getSimpleValueType();
16056 // The mask should be of type MVT::i1
16057 SDValue IMask = DAG.getNode(ISD::TRUNCATE, dl, MVT::i1, Mask);
16059 if (Op.getOpcode() == X86ISD::FSETCC)
16060 return DAG.getNode(ISD::AND, dl, VT, Op, IMask);
16061 if (Op.getOpcode() == X86ISD::VFPCLASS ||
16062 Op.getOpcode() == X86ISD::VFPCLASSS)
16063 return DAG.getNode(ISD::OR, dl, VT, Op, IMask);
16065 if (PreservedSrc.getOpcode() == ISD::UNDEF)
16066 PreservedSrc = getZeroVector(VT, Subtarget, DAG, dl);
16067 return DAG.getNode(X86ISD::SELECT, dl, VT, IMask, Op, PreservedSrc);
16070 static int getSEHRegistrationNodeSize(const Function *Fn) {
16071 if (!Fn->hasPersonalityFn())
16072 report_fatal_error(
16073 "querying registration node size for function without personality");
16074 // The RegNodeSize is 6 32-bit words for SEH and 4 for C++ EH. See
16075 // WinEHStatePass for the full struct definition.
16076 switch (classifyEHPersonality(Fn->getPersonalityFn())) {
16077 case EHPersonality::MSVC_X86SEH: return 24;
16078 case EHPersonality::MSVC_CXX: return 16;
16081 report_fatal_error("can only recover FP for MSVC EH personality functions");
16084 /// When the 32-bit MSVC runtime transfers control to us, either to an outlined
16085 /// function or when returning to a parent frame after catching an exception, we
16086 /// recover the parent frame pointer by doing arithmetic on the incoming EBP.
16087 /// Here's the math:
16088 /// RegNodeBase = EntryEBP - RegNodeSize
16089 /// ParentFP = RegNodeBase - RegNodeFrameOffset
16090 /// Subtracting RegNodeSize takes us to the offset of the registration node, and
16091 /// subtracting the offset (negative on x86) takes us back to the parent FP.
16092 static SDValue recoverFramePointer(SelectionDAG &DAG, const Function *Fn,
16093 SDValue EntryEBP) {
16094 MachineFunction &MF = DAG.getMachineFunction();
16097 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
16098 MVT PtrVT = TLI.getPointerTy(DAG.getDataLayout());
16100 // It's possible that the parent function no longer has a personality function
16101 // if the exceptional code was optimized away, in which case we just return
16102 // the incoming EBP.
16103 if (!Fn->hasPersonalityFn())
16106 int RegNodeSize = getSEHRegistrationNodeSize(Fn);
16108 // Get an MCSymbol that will ultimately resolve to the frame offset of the EH
16110 MCSymbol *OffsetSym =
16111 MF.getMMI().getContext().getOrCreateParentFrameOffsetSymbol(
16112 GlobalValue::getRealLinkageName(Fn->getName()));
16113 SDValue OffsetSymVal = DAG.getMCSymbol(OffsetSym, PtrVT);
16114 SDValue RegNodeFrameOffset =
16115 DAG.getNode(ISD::LOCAL_RECOVER, dl, PtrVT, OffsetSymVal);
16117 // RegNodeBase = EntryEBP - RegNodeSize
16118 // ParentFP = RegNodeBase - RegNodeFrameOffset
16119 SDValue RegNodeBase = DAG.getNode(ISD::SUB, dl, PtrVT, EntryEBP,
16120 DAG.getConstant(RegNodeSize, dl, PtrVT));
16121 return DAG.getNode(ISD::SUB, dl, PtrVT, RegNodeBase, RegNodeFrameOffset);
16124 static SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, const X86Subtarget *Subtarget,
16125 SelectionDAG &DAG) {
16127 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
16128 MVT VT = Op.getSimpleValueType();
16129 const IntrinsicData* IntrData = getIntrinsicWithoutChain(IntNo);
16131 switch(IntrData->Type) {
16132 case INTR_TYPE_1OP:
16133 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1));
16134 case INTR_TYPE_2OP:
16135 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1),
16137 case INTR_TYPE_2OP_IMM8:
16138 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1),
16139 DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op.getOperand(2)));
16140 case INTR_TYPE_3OP:
16141 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1),
16142 Op.getOperand(2), Op.getOperand(3));
16143 case INTR_TYPE_4OP:
16144 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Op.getOperand(1),
16145 Op.getOperand(2), Op.getOperand(3), Op.getOperand(4));
16146 case INTR_TYPE_1OP_MASK_RM: {
16147 SDValue Src = Op.getOperand(1);
16148 SDValue PassThru = Op.getOperand(2);
16149 SDValue Mask = Op.getOperand(3);
16150 SDValue RoundingMode;
16151 // We allways add rounding mode to the Node.
16152 // If the rounding mode is not specified, we add the
16153 // "current direction" mode.
16154 if (Op.getNumOperands() == 4)
16156 DAG.getConstant(X86::STATIC_ROUNDING::CUR_DIRECTION, dl, MVT::i32);
16158 RoundingMode = Op.getOperand(4);
16159 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
16160 if (IntrWithRoundingModeOpcode != 0)
16161 if (cast<ConstantSDNode>(RoundingMode)->getZExtValue() !=
16162 X86::STATIC_ROUNDING::CUR_DIRECTION)
16163 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
16164 dl, Op.getValueType(), Src, RoundingMode),
16165 Mask, PassThru, Subtarget, DAG);
16166 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src,
16168 Mask, PassThru, Subtarget, DAG);
16170 case INTR_TYPE_1OP_MASK: {
16171 SDValue Src = Op.getOperand(1);
16172 SDValue PassThru = Op.getOperand(2);
16173 SDValue Mask = Op.getOperand(3);
16174 // We add rounding mode to the Node when
16175 // - RM Opcode is specified and
16176 // - RM is not "current direction".
16177 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
16178 if (IntrWithRoundingModeOpcode != 0) {
16179 SDValue Rnd = Op.getOperand(4);
16180 unsigned Round = cast<ConstantSDNode>(Rnd)->getZExtValue();
16181 if (Round != X86::STATIC_ROUNDING::CUR_DIRECTION) {
16182 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
16183 dl, Op.getValueType(),
16185 Mask, PassThru, Subtarget, DAG);
16188 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src),
16189 Mask, PassThru, Subtarget, DAG);
16191 case INTR_TYPE_SCALAR_MASK: {
16192 SDValue Src1 = Op.getOperand(1);
16193 SDValue Src2 = Op.getOperand(2);
16194 SDValue passThru = Op.getOperand(3);
16195 SDValue Mask = Op.getOperand(4);
16196 return getScalarMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src1, Src2),
16197 Mask, passThru, Subtarget, DAG);
16199 case INTR_TYPE_SCALAR_MASK_RM: {
16200 SDValue Src1 = Op.getOperand(1);
16201 SDValue Src2 = Op.getOperand(2);
16202 SDValue Src0 = Op.getOperand(3);
16203 SDValue Mask = Op.getOperand(4);
16204 // There are 2 kinds of intrinsics in this group:
16205 // (1) With suppress-all-exceptions (sae) or rounding mode- 6 operands
16206 // (2) With rounding mode and sae - 7 operands.
16207 if (Op.getNumOperands() == 6) {
16208 SDValue Sae = Op.getOperand(5);
16209 unsigned Opc = IntrData->Opc1 ? IntrData->Opc1 : IntrData->Opc0;
16210 return getScalarMaskingNode(DAG.getNode(Opc, dl, VT, Src1, Src2,
16212 Mask, Src0, Subtarget, DAG);
16214 assert(Op.getNumOperands() == 7 && "Unexpected intrinsic form");
16215 SDValue RoundingMode = Op.getOperand(5);
16216 SDValue Sae = Op.getOperand(6);
16217 return getScalarMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src1, Src2,
16218 RoundingMode, Sae),
16219 Mask, Src0, Subtarget, DAG);
16221 case INTR_TYPE_2OP_MASK:
16222 case INTR_TYPE_2OP_IMM8_MASK: {
16223 SDValue Src1 = Op.getOperand(1);
16224 SDValue Src2 = Op.getOperand(2);
16225 SDValue PassThru = Op.getOperand(3);
16226 SDValue Mask = Op.getOperand(4);
16228 if (IntrData->Type == INTR_TYPE_2OP_IMM8_MASK)
16229 Src2 = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Src2);
16231 // We specify 2 possible opcodes for intrinsics with rounding modes.
16232 // First, we check if the intrinsic may have non-default rounding mode,
16233 // (IntrData->Opc1 != 0), then we check the rounding mode operand.
16234 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
16235 if (IntrWithRoundingModeOpcode != 0) {
16236 SDValue Rnd = Op.getOperand(5);
16237 unsigned Round = cast<ConstantSDNode>(Rnd)->getZExtValue();
16238 if (Round != X86::STATIC_ROUNDING::CUR_DIRECTION) {
16239 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
16240 dl, Op.getValueType(),
16242 Mask, PassThru, Subtarget, DAG);
16245 // TODO: Intrinsics should have fast-math-flags to propagate.
16246 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,Src1,Src2),
16247 Mask, PassThru, Subtarget, DAG);
16249 case INTR_TYPE_2OP_MASK_RM: {
16250 SDValue Src1 = Op.getOperand(1);
16251 SDValue Src2 = Op.getOperand(2);
16252 SDValue PassThru = Op.getOperand(3);
16253 SDValue Mask = Op.getOperand(4);
16254 // We specify 2 possible modes for intrinsics, with/without rounding
16256 // First, we check if the intrinsic have rounding mode (6 operands),
16257 // if not, we set rounding mode to "current".
16259 if (Op.getNumOperands() == 6)
16260 Rnd = Op.getOperand(5);
16262 Rnd = DAG.getConstant(X86::STATIC_ROUNDING::CUR_DIRECTION, dl, MVT::i32);
16263 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16265 Mask, PassThru, Subtarget, DAG);
16267 case INTR_TYPE_3OP_SCALAR_MASK_RM: {
16268 SDValue Src1 = Op.getOperand(1);
16269 SDValue Src2 = Op.getOperand(2);
16270 SDValue Src3 = Op.getOperand(3);
16271 SDValue PassThru = Op.getOperand(4);
16272 SDValue Mask = Op.getOperand(5);
16273 SDValue Sae = Op.getOperand(6);
16275 return getScalarMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, Src1,
16277 Mask, PassThru, Subtarget, DAG);
16279 case INTR_TYPE_3OP_MASK_RM: {
16280 SDValue Src1 = Op.getOperand(1);
16281 SDValue Src2 = Op.getOperand(2);
16282 SDValue Imm = Op.getOperand(3);
16283 SDValue PassThru = Op.getOperand(4);
16284 SDValue Mask = Op.getOperand(5);
16285 // We specify 2 possible modes for intrinsics, with/without rounding
16287 // First, we check if the intrinsic have rounding mode (7 operands),
16288 // if not, we set rounding mode to "current".
16290 if (Op.getNumOperands() == 7)
16291 Rnd = Op.getOperand(6);
16293 Rnd = DAG.getConstant(X86::STATIC_ROUNDING::CUR_DIRECTION, dl, MVT::i32);
16294 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16295 Src1, Src2, Imm, Rnd),
16296 Mask, PassThru, Subtarget, DAG);
16298 case INTR_TYPE_3OP_IMM8_MASK:
16299 case INTR_TYPE_3OP_MASK:
16300 case INSERT_SUBVEC: {
16301 SDValue Src1 = Op.getOperand(1);
16302 SDValue Src2 = Op.getOperand(2);
16303 SDValue Src3 = Op.getOperand(3);
16304 SDValue PassThru = Op.getOperand(4);
16305 SDValue Mask = Op.getOperand(5);
16307 if (IntrData->Type == INTR_TYPE_3OP_IMM8_MASK)
16308 Src3 = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Src3);
16309 else if (IntrData->Type == INSERT_SUBVEC) {
16310 // imm should be adapted to ISD::INSERT_SUBVECTOR behavior
16311 assert(isa<ConstantSDNode>(Src3) && "Expected a ConstantSDNode here!");
16312 unsigned Imm = cast<ConstantSDNode>(Src3)->getZExtValue();
16313 Imm *= Src2.getSimpleValueType().getVectorNumElements();
16314 Src3 = DAG.getTargetConstant(Imm, dl, MVT::i32);
16317 // We specify 2 possible opcodes for intrinsics with rounding modes.
16318 // First, we check if the intrinsic may have non-default rounding mode,
16319 // (IntrData->Opc1 != 0), then we check the rounding mode operand.
16320 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
16321 if (IntrWithRoundingModeOpcode != 0) {
16322 SDValue Rnd = Op.getOperand(6);
16323 unsigned Round = cast<ConstantSDNode>(Rnd)->getZExtValue();
16324 if (Round != X86::STATIC_ROUNDING::CUR_DIRECTION) {
16325 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
16326 dl, Op.getValueType(),
16327 Src1, Src2, Src3, Rnd),
16328 Mask, PassThru, Subtarget, DAG);
16331 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16333 Mask, PassThru, Subtarget, DAG);
16335 case VPERM_3OP_MASKZ:
16336 case VPERM_3OP_MASK:{
16337 // Src2 is the PassThru
16338 SDValue Src1 = Op.getOperand(1);
16339 SDValue Src2 = Op.getOperand(2);
16340 SDValue Src3 = Op.getOperand(3);
16341 SDValue Mask = Op.getOperand(4);
16342 MVT VT = Op.getSimpleValueType();
16343 SDValue PassThru = SDValue();
16345 // set PassThru element
16346 if (IntrData->Type == VPERM_3OP_MASKZ)
16347 PassThru = getZeroVector(VT, Subtarget, DAG, dl);
16349 PassThru = DAG.getBitcast(VT, Src2);
16351 // Swap Src1 and Src2 in the node creation
16352 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0,
16353 dl, Op.getValueType(),
16355 Mask, PassThru, Subtarget, DAG);
16359 case FMA_OP_MASK: {
16360 SDValue Src1 = Op.getOperand(1);
16361 SDValue Src2 = Op.getOperand(2);
16362 SDValue Src3 = Op.getOperand(3);
16363 SDValue Mask = Op.getOperand(4);
16364 MVT VT = Op.getSimpleValueType();
16365 SDValue PassThru = SDValue();
16367 // set PassThru element
16368 if (IntrData->Type == FMA_OP_MASKZ)
16369 PassThru = getZeroVector(VT, Subtarget, DAG, dl);
16370 else if (IntrData->Type == FMA_OP_MASK3)
16375 // We specify 2 possible opcodes for intrinsics with rounding modes.
16376 // First, we check if the intrinsic may have non-default rounding mode,
16377 // (IntrData->Opc1 != 0), then we check the rounding mode operand.
16378 unsigned IntrWithRoundingModeOpcode = IntrData->Opc1;
16379 if (IntrWithRoundingModeOpcode != 0) {
16380 SDValue Rnd = Op.getOperand(5);
16381 if (cast<ConstantSDNode>(Rnd)->getZExtValue() !=
16382 X86::STATIC_ROUNDING::CUR_DIRECTION)
16383 return getVectorMaskingNode(DAG.getNode(IntrWithRoundingModeOpcode,
16384 dl, Op.getValueType(),
16385 Src1, Src2, Src3, Rnd),
16386 Mask, PassThru, Subtarget, DAG);
16388 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0,
16389 dl, Op.getValueType(),
16391 Mask, PassThru, Subtarget, DAG);
16393 case TERLOG_OP_MASK:
16394 case TERLOG_OP_MASKZ: {
16395 SDValue Src1 = Op.getOperand(1);
16396 SDValue Src2 = Op.getOperand(2);
16397 SDValue Src3 = Op.getOperand(3);
16398 SDValue Src4 = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op.getOperand(4));
16399 SDValue Mask = Op.getOperand(5);
16400 MVT VT = Op.getSimpleValueType();
16401 SDValue PassThru = Src1;
16402 // Set PassThru element.
16403 if (IntrData->Type == TERLOG_OP_MASKZ)
16404 PassThru = getZeroVector(VT, Subtarget, DAG, dl);
16406 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16407 Src1, Src2, Src3, Src4),
16408 Mask, PassThru, Subtarget, DAG);
16411 // FPclass intrinsics with mask
16412 SDValue Src1 = Op.getOperand(1);
16413 MVT VT = Src1.getSimpleValueType();
16414 MVT MaskVT = MVT::getVectorVT(MVT::i1, VT.getVectorNumElements());
16415 SDValue Imm = Op.getOperand(2);
16416 SDValue Mask = Op.getOperand(3);
16417 MVT BitcastVT = MVT::getVectorVT(MVT::i1,
16418 Mask.getSimpleValueType().getSizeInBits());
16419 SDValue FPclass = DAG.getNode(IntrData->Opc0, dl, MaskVT, Src1, Imm);
16420 SDValue FPclassMask = getVectorMaskingNode(FPclass, Mask,
16421 DAG.getTargetConstant(0, dl, MaskVT),
16423 SDValue Res = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, BitcastVT,
16424 DAG.getUNDEF(BitcastVT), FPclassMask,
16425 DAG.getIntPtrConstant(0, dl));
16426 return DAG.getBitcast(Op.getValueType(), Res);
16429 SDValue Src1 = Op.getOperand(1);
16430 SDValue Imm = Op.getOperand(2);
16431 SDValue Mask = Op.getOperand(3);
16432 SDValue FPclass = DAG.getNode(IntrData->Opc0, dl, MVT::i1, Src1, Imm);
16433 SDValue FPclassMask = getScalarMaskingNode(FPclass, Mask,
16434 DAG.getTargetConstant(0, dl, MVT::i1), Subtarget, DAG);
16435 return DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::i8, FPclassMask);
16438 case CMP_MASK_CC: {
16439 // Comparison intrinsics with masks.
16440 // Example of transformation:
16441 // (i8 (int_x86_avx512_mask_pcmpeq_q_128
16442 // (v2i64 %a), (v2i64 %b), (i8 %mask))) ->
16444 // (v8i1 (insert_subvector undef,
16445 // (v2i1 (and (PCMPEQM %a, %b),
16446 // (extract_subvector
16447 // (v8i1 (bitcast %mask)), 0))), 0))))
16448 MVT VT = Op.getOperand(1).getSimpleValueType();
16449 MVT MaskVT = MVT::getVectorVT(MVT::i1, VT.getVectorNumElements());
16450 SDValue Mask = Op.getOperand((IntrData->Type == CMP_MASK_CC) ? 4 : 3);
16451 MVT BitcastVT = MVT::getVectorVT(MVT::i1,
16452 Mask.getSimpleValueType().getSizeInBits());
16454 if (IntrData->Type == CMP_MASK_CC) {
16455 SDValue CC = Op.getOperand(3);
16456 CC = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, CC);
16457 // We specify 2 possible opcodes for intrinsics with rounding modes.
16458 // First, we check if the intrinsic may have non-default rounding mode,
16459 // (IntrData->Opc1 != 0), then we check the rounding mode operand.
16460 if (IntrData->Opc1 != 0) {
16461 SDValue Rnd = Op.getOperand(5);
16462 if (cast<ConstantSDNode>(Rnd)->getZExtValue() !=
16463 X86::STATIC_ROUNDING::CUR_DIRECTION)
16464 Cmp = DAG.getNode(IntrData->Opc1, dl, MaskVT, Op.getOperand(1),
16465 Op.getOperand(2), CC, Rnd);
16467 //default rounding mode
16469 Cmp = DAG.getNode(IntrData->Opc0, dl, MaskVT, Op.getOperand(1),
16470 Op.getOperand(2), CC);
16473 assert(IntrData->Type == CMP_MASK && "Unexpected intrinsic type!");
16474 Cmp = DAG.getNode(IntrData->Opc0, dl, MaskVT, Op.getOperand(1),
16477 SDValue CmpMask = getVectorMaskingNode(Cmp, Mask,
16478 DAG.getTargetConstant(0, dl,
16481 SDValue Res = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, BitcastVT,
16482 DAG.getUNDEF(BitcastVT), CmpMask,
16483 DAG.getIntPtrConstant(0, dl));
16484 return DAG.getBitcast(Op.getValueType(), Res);
16486 case CMP_MASK_SCALAR_CC: {
16487 SDValue Src1 = Op.getOperand(1);
16488 SDValue Src2 = Op.getOperand(2);
16489 SDValue CC = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op.getOperand(3));
16490 SDValue Mask = Op.getOperand(4);
16493 if (IntrData->Opc1 != 0) {
16494 SDValue Rnd = Op.getOperand(5);
16495 if (cast<ConstantSDNode>(Rnd)->getZExtValue() !=
16496 X86::STATIC_ROUNDING::CUR_DIRECTION)
16497 Cmp = DAG.getNode(IntrData->Opc1, dl, MVT::i1, Src1, Src2, CC, Rnd);
16499 //default rounding mode
16501 Cmp = DAG.getNode(IntrData->Opc0, dl, MVT::i1, Src1, Src2, CC);
16503 SDValue CmpMask = getScalarMaskingNode(Cmp, Mask,
16504 DAG.getTargetConstant(0, dl,
16508 return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, MVT::i8,
16509 DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i8, CmpMask),
16510 DAG.getValueType(MVT::i1));
16512 case COMI: { // Comparison intrinsics
16513 ISD::CondCode CC = (ISD::CondCode)IntrData->Opc1;
16514 SDValue LHS = Op.getOperand(1);
16515 SDValue RHS = Op.getOperand(2);
16516 unsigned X86CC = TranslateX86CC(CC, dl, true, LHS, RHS, DAG);
16517 assert(X86CC != X86::COND_INVALID && "Unexpected illegal condition!");
16518 SDValue Cond = DAG.getNode(IntrData->Opc0, dl, MVT::i32, LHS, RHS);
16519 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
16520 DAG.getConstant(X86CC, dl, MVT::i8), Cond);
16521 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16523 case COMI_RM: { // Comparison intrinsics with Sae
16524 SDValue LHS = Op.getOperand(1);
16525 SDValue RHS = Op.getOperand(2);
16526 SDValue CC = Op.getOperand(3);
16527 SDValue Sae = Op.getOperand(4);
16528 auto ComiType = TranslateX86ConstCondToX86CC(CC);
16529 // choose between ordered and unordered (comi/ucomi)
16530 unsigned comiOp = std::get<0>(ComiType) ? IntrData->Opc0 : IntrData->Opc1;
16532 if (cast<ConstantSDNode>(Sae)->getZExtValue() !=
16533 X86::STATIC_ROUNDING::CUR_DIRECTION)
16534 Cond = DAG.getNode(comiOp, dl, MVT::i32, LHS, RHS, Sae);
16536 Cond = DAG.getNode(comiOp, dl, MVT::i32, LHS, RHS);
16537 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
16538 DAG.getConstant(std::get<1>(ComiType), dl, MVT::i8), Cond);
16539 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16542 return getTargetVShiftNode(IntrData->Opc0, dl, Op.getSimpleValueType(),
16543 Op.getOperand(1), Op.getOperand(2), DAG);
16545 return getVectorMaskingNode(getTargetVShiftNode(IntrData->Opc0, dl,
16546 Op.getSimpleValueType(),
16548 Op.getOperand(2), DAG),
16549 Op.getOperand(4), Op.getOperand(3), Subtarget,
16551 case COMPRESS_EXPAND_IN_REG: {
16552 SDValue Mask = Op.getOperand(3);
16553 SDValue DataToCompress = Op.getOperand(1);
16554 SDValue PassThru = Op.getOperand(2);
16555 if (isAllOnesConstant(Mask)) // return data as is
16556 return Op.getOperand(1);
16558 return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
16560 Mask, PassThru, Subtarget, DAG);
16563 SDValue Mask = Op.getOperand(1);
16564 MVT MaskVT = MVT::getVectorVT(MVT::i1, Mask.getSimpleValueType().getSizeInBits());
16565 Mask = DAG.getBitcast(MaskVT, Mask);
16566 return DAG.getNode(IntrData->Opc0, dl, Op.getValueType(), Mask);
16569 SDValue Mask = Op.getOperand(3);
16570 MVT VT = Op.getSimpleValueType();
16571 MVT MaskVT = MVT::getVectorVT(MVT::i1, VT.getVectorNumElements());
16572 MVT BitcastVT = MVT::getVectorVT(MVT::i1,
16573 Mask.getSimpleValueType().getSizeInBits());
16575 SDValue VMask = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
16576 DAG.getBitcast(BitcastVT, Mask),
16577 DAG.getIntPtrConstant(0, dl));
16578 return DAG.getNode(IntrData->Opc0, dl, VT, VMask, Op.getOperand(1),
16587 default: return SDValue(); // Don't custom lower most intrinsics.
16589 case Intrinsic::x86_avx2_permd:
16590 case Intrinsic::x86_avx2_permps:
16591 // Operands intentionally swapped. Mask is last operand to intrinsic,
16592 // but second operand for node/instruction.
16593 return DAG.getNode(X86ISD::VPERMV, dl, Op.getValueType(),
16594 Op.getOperand(2), Op.getOperand(1));
16596 // ptest and testp intrinsics. The intrinsic these come from are designed to
16597 // return an integer value, not just an instruction so lower it to the ptest
16598 // or testp pattern and a setcc for the result.
16599 case Intrinsic::x86_sse41_ptestz:
16600 case Intrinsic::x86_sse41_ptestc:
16601 case Intrinsic::x86_sse41_ptestnzc:
16602 case Intrinsic::x86_avx_ptestz_256:
16603 case Intrinsic::x86_avx_ptestc_256:
16604 case Intrinsic::x86_avx_ptestnzc_256:
16605 case Intrinsic::x86_avx_vtestz_ps:
16606 case Intrinsic::x86_avx_vtestc_ps:
16607 case Intrinsic::x86_avx_vtestnzc_ps:
16608 case Intrinsic::x86_avx_vtestz_pd:
16609 case Intrinsic::x86_avx_vtestc_pd:
16610 case Intrinsic::x86_avx_vtestnzc_pd:
16611 case Intrinsic::x86_avx_vtestz_ps_256:
16612 case Intrinsic::x86_avx_vtestc_ps_256:
16613 case Intrinsic::x86_avx_vtestnzc_ps_256:
16614 case Intrinsic::x86_avx_vtestz_pd_256:
16615 case Intrinsic::x86_avx_vtestc_pd_256:
16616 case Intrinsic::x86_avx_vtestnzc_pd_256: {
16617 bool IsTestPacked = false;
16620 default: llvm_unreachable("Bad fallthrough in Intrinsic lowering.");
16621 case Intrinsic::x86_avx_vtestz_ps:
16622 case Intrinsic::x86_avx_vtestz_pd:
16623 case Intrinsic::x86_avx_vtestz_ps_256:
16624 case Intrinsic::x86_avx_vtestz_pd_256:
16625 IsTestPacked = true; // Fallthrough
16626 case Intrinsic::x86_sse41_ptestz:
16627 case Intrinsic::x86_avx_ptestz_256:
16629 X86CC = X86::COND_E;
16631 case Intrinsic::x86_avx_vtestc_ps:
16632 case Intrinsic::x86_avx_vtestc_pd:
16633 case Intrinsic::x86_avx_vtestc_ps_256:
16634 case Intrinsic::x86_avx_vtestc_pd_256:
16635 IsTestPacked = true; // Fallthrough
16636 case Intrinsic::x86_sse41_ptestc:
16637 case Intrinsic::x86_avx_ptestc_256:
16639 X86CC = X86::COND_B;
16641 case Intrinsic::x86_avx_vtestnzc_ps:
16642 case Intrinsic::x86_avx_vtestnzc_pd:
16643 case Intrinsic::x86_avx_vtestnzc_ps_256:
16644 case Intrinsic::x86_avx_vtestnzc_pd_256:
16645 IsTestPacked = true; // Fallthrough
16646 case Intrinsic::x86_sse41_ptestnzc:
16647 case Intrinsic::x86_avx_ptestnzc_256:
16649 X86CC = X86::COND_A;
16653 SDValue LHS = Op.getOperand(1);
16654 SDValue RHS = Op.getOperand(2);
16655 unsigned TestOpc = IsTestPacked ? X86ISD::TESTP : X86ISD::PTEST;
16656 SDValue Test = DAG.getNode(TestOpc, dl, MVT::i32, LHS, RHS);
16657 SDValue CC = DAG.getConstant(X86CC, dl, MVT::i8);
16658 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8, CC, Test);
16659 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16661 case Intrinsic::x86_avx512_kortestz_w:
16662 case Intrinsic::x86_avx512_kortestc_w: {
16663 unsigned X86CC = (IntNo == Intrinsic::x86_avx512_kortestz_w)? X86::COND_E: X86::COND_B;
16664 SDValue LHS = DAG.getBitcast(MVT::v16i1, Op.getOperand(1));
16665 SDValue RHS = DAG.getBitcast(MVT::v16i1, Op.getOperand(2));
16666 SDValue CC = DAG.getConstant(X86CC, dl, MVT::i8);
16667 SDValue Test = DAG.getNode(X86ISD::KORTEST, dl, MVT::i32, LHS, RHS);
16668 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i1, CC, Test);
16669 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16672 case Intrinsic::x86_sse42_pcmpistria128:
16673 case Intrinsic::x86_sse42_pcmpestria128:
16674 case Intrinsic::x86_sse42_pcmpistric128:
16675 case Intrinsic::x86_sse42_pcmpestric128:
16676 case Intrinsic::x86_sse42_pcmpistrio128:
16677 case Intrinsic::x86_sse42_pcmpestrio128:
16678 case Intrinsic::x86_sse42_pcmpistris128:
16679 case Intrinsic::x86_sse42_pcmpestris128:
16680 case Intrinsic::x86_sse42_pcmpistriz128:
16681 case Intrinsic::x86_sse42_pcmpestriz128: {
16685 default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
16686 case Intrinsic::x86_sse42_pcmpistria128:
16687 Opcode = X86ISD::PCMPISTRI;
16688 X86CC = X86::COND_A;
16690 case Intrinsic::x86_sse42_pcmpestria128:
16691 Opcode = X86ISD::PCMPESTRI;
16692 X86CC = X86::COND_A;
16694 case Intrinsic::x86_sse42_pcmpistric128:
16695 Opcode = X86ISD::PCMPISTRI;
16696 X86CC = X86::COND_B;
16698 case Intrinsic::x86_sse42_pcmpestric128:
16699 Opcode = X86ISD::PCMPESTRI;
16700 X86CC = X86::COND_B;
16702 case Intrinsic::x86_sse42_pcmpistrio128:
16703 Opcode = X86ISD::PCMPISTRI;
16704 X86CC = X86::COND_O;
16706 case Intrinsic::x86_sse42_pcmpestrio128:
16707 Opcode = X86ISD::PCMPESTRI;
16708 X86CC = X86::COND_O;
16710 case Intrinsic::x86_sse42_pcmpistris128:
16711 Opcode = X86ISD::PCMPISTRI;
16712 X86CC = X86::COND_S;
16714 case Intrinsic::x86_sse42_pcmpestris128:
16715 Opcode = X86ISD::PCMPESTRI;
16716 X86CC = X86::COND_S;
16718 case Intrinsic::x86_sse42_pcmpistriz128:
16719 Opcode = X86ISD::PCMPISTRI;
16720 X86CC = X86::COND_E;
16722 case Intrinsic::x86_sse42_pcmpestriz128:
16723 Opcode = X86ISD::PCMPESTRI;
16724 X86CC = X86::COND_E;
16727 SmallVector<SDValue, 5> NewOps(Op->op_begin()+1, Op->op_end());
16728 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
16729 SDValue PCMP = DAG.getNode(Opcode, dl, VTs, NewOps);
16730 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
16731 DAG.getConstant(X86CC, dl, MVT::i8),
16732 SDValue(PCMP.getNode(), 1));
16733 return DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, SetCC);
16736 case Intrinsic::x86_sse42_pcmpistri128:
16737 case Intrinsic::x86_sse42_pcmpestri128: {
16739 if (IntNo == Intrinsic::x86_sse42_pcmpistri128)
16740 Opcode = X86ISD::PCMPISTRI;
16742 Opcode = X86ISD::PCMPESTRI;
16744 SmallVector<SDValue, 5> NewOps(Op->op_begin()+1, Op->op_end());
16745 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
16746 return DAG.getNode(Opcode, dl, VTs, NewOps);
16749 case Intrinsic::x86_seh_lsda: {
16750 // Compute the symbol for the LSDA. We know it'll get emitted later.
16751 MachineFunction &MF = DAG.getMachineFunction();
16752 SDValue Op1 = Op.getOperand(1);
16753 auto *Fn = cast<Function>(cast<GlobalAddressSDNode>(Op1)->getGlobal());
16754 MCSymbol *LSDASym = MF.getMMI().getContext().getOrCreateLSDASymbol(
16755 GlobalValue::getRealLinkageName(Fn->getName()));
16757 // Generate a simple absolute symbol reference. This intrinsic is only
16758 // supported on 32-bit Windows, which isn't PIC.
16759 SDValue Result = DAG.getMCSymbol(LSDASym, VT);
16760 return DAG.getNode(X86ISD::Wrapper, dl, VT, Result);
16763 case Intrinsic::x86_seh_recoverfp: {
16764 SDValue FnOp = Op.getOperand(1);
16765 SDValue IncomingFPOp = Op.getOperand(2);
16766 GlobalAddressSDNode *GSD = dyn_cast<GlobalAddressSDNode>(FnOp);
16767 auto *Fn = dyn_cast_or_null<Function>(GSD ? GSD->getGlobal() : nullptr);
16769 report_fatal_error(
16770 "llvm.x86.seh.recoverfp must take a function as the first argument");
16771 return recoverFramePointer(DAG, Fn, IncomingFPOp);
16774 case Intrinsic::localaddress: {
16775 // Returns one of the stack, base, or frame pointer registers, depending on
16776 // which is used to reference local variables.
16777 MachineFunction &MF = DAG.getMachineFunction();
16778 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
16780 if (RegInfo->hasBasePointer(MF))
16781 Reg = RegInfo->getBaseRegister();
16782 else // This function handles the SP or FP case.
16783 Reg = RegInfo->getPtrSizedFrameRegister(MF);
16784 return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
16789 static SDValue getGatherNode(unsigned Opc, SDValue Op, SelectionDAG &DAG,
16790 SDValue Src, SDValue Mask, SDValue Base,
16791 SDValue Index, SDValue ScaleOp, SDValue Chain,
16792 const X86Subtarget * Subtarget) {
16794 auto *C = cast<ConstantSDNode>(ScaleOp);
16795 SDValue Scale = DAG.getTargetConstant(C->getZExtValue(), dl, MVT::i8);
16796 MVT MaskVT = MVT::getVectorVT(MVT::i1,
16797 Index.getSimpleValueType().getVectorNumElements());
16799 ConstantSDNode *MaskC = dyn_cast<ConstantSDNode>(Mask);
16801 MaskInReg = DAG.getTargetConstant(MaskC->getSExtValue(), dl, MaskVT);
16803 MVT BitcastVT = MVT::getVectorVT(MVT::i1,
16804 Mask.getSimpleValueType().getSizeInBits());
16806 // In case when MaskVT equals v2i1 or v4i1, low 2 or 4 elements
16807 // are extracted by EXTRACT_SUBVECTOR.
16808 MaskInReg = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
16809 DAG.getBitcast(BitcastVT, Mask),
16810 DAG.getIntPtrConstant(0, dl));
16812 SDVTList VTs = DAG.getVTList(Op.getValueType(), MaskVT, MVT::Other);
16813 SDValue Disp = DAG.getTargetConstant(0, dl, MVT::i32);
16814 SDValue Segment = DAG.getRegister(0, MVT::i32);
16815 if (Src.getOpcode() == ISD::UNDEF)
16816 Src = getZeroVector(Op.getSimpleValueType(), Subtarget, DAG, dl);
16817 SDValue Ops[] = {Src, MaskInReg, Base, Scale, Index, Disp, Segment, Chain};
16818 SDNode *Res = DAG.getMachineNode(Opc, dl, VTs, Ops);
16819 SDValue RetOps[] = { SDValue(Res, 0), SDValue(Res, 2) };
16820 return DAG.getMergeValues(RetOps, dl);
16823 static SDValue getScatterNode(unsigned Opc, SDValue Op, SelectionDAG &DAG,
16824 SDValue Src, SDValue Mask, SDValue Base,
16825 SDValue Index, SDValue ScaleOp, SDValue Chain) {
16827 auto *C = cast<ConstantSDNode>(ScaleOp);
16828 SDValue Scale = DAG.getTargetConstant(C->getZExtValue(), dl, MVT::i8);
16829 SDValue Disp = DAG.getTargetConstant(0, dl, MVT::i32);
16830 SDValue Segment = DAG.getRegister(0, MVT::i32);
16831 MVT MaskVT = MVT::getVectorVT(MVT::i1,
16832 Index.getSimpleValueType().getVectorNumElements());
16834 ConstantSDNode *MaskC = dyn_cast<ConstantSDNode>(Mask);
16836 MaskInReg = DAG.getTargetConstant(MaskC->getSExtValue(), dl, MaskVT);
16838 MVT BitcastVT = MVT::getVectorVT(MVT::i1,
16839 Mask.getSimpleValueType().getSizeInBits());
16841 // In case when MaskVT equals v2i1 or v4i1, low 2 or 4 elements
16842 // are extracted by EXTRACT_SUBVECTOR.
16843 MaskInReg = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
16844 DAG.getBitcast(BitcastVT, Mask),
16845 DAG.getIntPtrConstant(0, dl));
16847 SDVTList VTs = DAG.getVTList(MaskVT, MVT::Other);
16848 SDValue Ops[] = {Base, Scale, Index, Disp, Segment, MaskInReg, Src, Chain};
16849 SDNode *Res = DAG.getMachineNode(Opc, dl, VTs, Ops);
16850 return SDValue(Res, 1);
16853 static SDValue getPrefetchNode(unsigned Opc, SDValue Op, SelectionDAG &DAG,
16854 SDValue Mask, SDValue Base, SDValue Index,
16855 SDValue ScaleOp, SDValue Chain) {
16857 auto *C = cast<ConstantSDNode>(ScaleOp);
16858 SDValue Scale = DAG.getTargetConstant(C->getZExtValue(), dl, MVT::i8);
16859 SDValue Disp = DAG.getTargetConstant(0, dl, MVT::i32);
16860 SDValue Segment = DAG.getRegister(0, MVT::i32);
16862 MVT::getVectorVT(MVT::i1, Index.getSimpleValueType().getVectorNumElements());
16864 ConstantSDNode *MaskC = dyn_cast<ConstantSDNode>(Mask);
16866 MaskInReg = DAG.getTargetConstant(MaskC->getSExtValue(), dl, MaskVT);
16868 MaskInReg = DAG.getBitcast(MaskVT, Mask);
16869 //SDVTList VTs = DAG.getVTList(MVT::Other);
16870 SDValue Ops[] = {MaskInReg, Base, Scale, Index, Disp, Segment, Chain};
16871 SDNode *Res = DAG.getMachineNode(Opc, dl, MVT::Other, Ops);
16872 return SDValue(Res, 0);
16875 // getReadPerformanceCounter - Handles the lowering of builtin intrinsics that
16876 // read performance monitor counters (x86_rdpmc).
16877 static void getReadPerformanceCounter(SDNode *N, SDLoc DL,
16878 SelectionDAG &DAG, const X86Subtarget *Subtarget,
16879 SmallVectorImpl<SDValue> &Results) {
16880 assert(N->getNumOperands() == 3 && "Unexpected number of operands!");
16881 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
16884 // The ECX register is used to select the index of the performance counter
16886 SDValue Chain = DAG.getCopyToReg(N->getOperand(0), DL, X86::ECX,
16888 SDValue rd = DAG.getNode(X86ISD::RDPMC_DAG, DL, Tys, Chain);
16890 // Reads the content of a 64-bit performance counter and returns it in the
16891 // registers EDX:EAX.
16892 if (Subtarget->is64Bit()) {
16893 LO = DAG.getCopyFromReg(rd, DL, X86::RAX, MVT::i64, rd.getValue(1));
16894 HI = DAG.getCopyFromReg(LO.getValue(1), DL, X86::RDX, MVT::i64,
16897 LO = DAG.getCopyFromReg(rd, DL, X86::EAX, MVT::i32, rd.getValue(1));
16898 HI = DAG.getCopyFromReg(LO.getValue(1), DL, X86::EDX, MVT::i32,
16901 Chain = HI.getValue(1);
16903 if (Subtarget->is64Bit()) {
16904 // The EAX register is loaded with the low-order 32 bits. The EDX register
16905 // is loaded with the supported high-order bits of the counter.
16906 SDValue Tmp = DAG.getNode(ISD::SHL, DL, MVT::i64, HI,
16907 DAG.getConstant(32, DL, MVT::i8));
16908 Results.push_back(DAG.getNode(ISD::OR, DL, MVT::i64, LO, Tmp));
16909 Results.push_back(Chain);
16913 // Use a buildpair to merge the two 32-bit values into a 64-bit one.
16914 SDValue Ops[] = { LO, HI };
16915 SDValue Pair = DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, Ops);
16916 Results.push_back(Pair);
16917 Results.push_back(Chain);
16920 // getReadTimeStampCounter - Handles the lowering of builtin intrinsics that
16921 // read the time stamp counter (x86_rdtsc and x86_rdtscp). This function is
16922 // also used to custom lower READCYCLECOUNTER nodes.
16923 static void getReadTimeStampCounter(SDNode *N, SDLoc DL, unsigned Opcode,
16924 SelectionDAG &DAG, const X86Subtarget *Subtarget,
16925 SmallVectorImpl<SDValue> &Results) {
16926 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
16927 SDValue rd = DAG.getNode(Opcode, DL, Tys, N->getOperand(0));
16930 // The processor's time-stamp counter (a 64-bit MSR) is stored into the
16931 // EDX:EAX registers. EDX is loaded with the high-order 32 bits of the MSR
16932 // and the EAX register is loaded with the low-order 32 bits.
16933 if (Subtarget->is64Bit()) {
16934 LO = DAG.getCopyFromReg(rd, DL, X86::RAX, MVT::i64, rd.getValue(1));
16935 HI = DAG.getCopyFromReg(LO.getValue(1), DL, X86::RDX, MVT::i64,
16938 LO = DAG.getCopyFromReg(rd, DL, X86::EAX, MVT::i32, rd.getValue(1));
16939 HI = DAG.getCopyFromReg(LO.getValue(1), DL, X86::EDX, MVT::i32,
16942 SDValue Chain = HI.getValue(1);
16944 if (Opcode == X86ISD::RDTSCP_DAG) {
16945 assert(N->getNumOperands() == 3 && "Unexpected number of operands!");
16947 // Instruction RDTSCP loads the IA32:TSC_AUX_MSR (address C000_0103H) into
16948 // the ECX register. Add 'ecx' explicitly to the chain.
16949 SDValue ecx = DAG.getCopyFromReg(Chain, DL, X86::ECX, MVT::i32,
16951 // Explicitly store the content of ECX at the location passed in input
16952 // to the 'rdtscp' intrinsic.
16953 Chain = DAG.getStore(ecx.getValue(1), DL, ecx, N->getOperand(2),
16954 MachinePointerInfo(), false, false, 0);
16957 if (Subtarget->is64Bit()) {
16958 // The EDX register is loaded with the high-order 32 bits of the MSR, and
16959 // the EAX register is loaded with the low-order 32 bits.
16960 SDValue Tmp = DAG.getNode(ISD::SHL, DL, MVT::i64, HI,
16961 DAG.getConstant(32, DL, MVT::i8));
16962 Results.push_back(DAG.getNode(ISD::OR, DL, MVT::i64, LO, Tmp));
16963 Results.push_back(Chain);
16967 // Use a buildpair to merge the two 32-bit values into a 64-bit one.
16968 SDValue Ops[] = { LO, HI };
16969 SDValue Pair = DAG.getNode(ISD::BUILD_PAIR, DL, MVT::i64, Ops);
16970 Results.push_back(Pair);
16971 Results.push_back(Chain);
16974 static SDValue LowerREADCYCLECOUNTER(SDValue Op, const X86Subtarget *Subtarget,
16975 SelectionDAG &DAG) {
16976 SmallVector<SDValue, 2> Results;
16978 getReadTimeStampCounter(Op.getNode(), DL, X86ISD::RDTSC_DAG, DAG, Subtarget,
16980 return DAG.getMergeValues(Results, DL);
16983 static SDValue LowerSEHRESTOREFRAME(SDValue Op, const X86Subtarget *Subtarget,
16984 SelectionDAG &DAG) {
16985 MachineFunction &MF = DAG.getMachineFunction();
16986 const Function *Fn = MF.getFunction();
16988 SDValue Chain = Op.getOperand(0);
16990 assert(Subtarget->getFrameLowering()->hasFP(MF) &&
16991 "using llvm.x86.seh.restoreframe requires a frame pointer");
16993 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
16994 MVT VT = TLI.getPointerTy(DAG.getDataLayout());
16996 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
16997 unsigned FrameReg =
16998 RegInfo->getPtrSizedFrameRegister(DAG.getMachineFunction());
16999 unsigned SPReg = RegInfo->getStackRegister();
17000 unsigned SlotSize = RegInfo->getSlotSize();
17002 // Get incoming EBP.
17003 SDValue IncomingEBP =
17004 DAG.getCopyFromReg(Chain, dl, FrameReg, VT);
17006 // SP is saved in the first field of every registration node, so load
17007 // [EBP-RegNodeSize] into SP.
17008 int RegNodeSize = getSEHRegistrationNodeSize(Fn);
17009 SDValue SPAddr = DAG.getNode(ISD::ADD, dl, VT, IncomingEBP,
17010 DAG.getConstant(-RegNodeSize, dl, VT));
17012 DAG.getLoad(VT, dl, Chain, SPAddr, MachinePointerInfo(), false, false,
17013 false, VT.getScalarSizeInBits() / 8);
17014 Chain = DAG.getCopyToReg(Chain, dl, SPReg, NewSP);
17016 if (!RegInfo->needsStackRealignment(MF)) {
17017 // Adjust EBP to point back to the original frame position.
17018 SDValue NewFP = recoverFramePointer(DAG, Fn, IncomingEBP);
17019 Chain = DAG.getCopyToReg(Chain, dl, FrameReg, NewFP);
17021 assert(RegInfo->hasBasePointer(MF) &&
17022 "functions with Win32 EH must use frame or base pointer register");
17024 // Reload the base pointer (ESI) with the adjusted incoming EBP.
17025 SDValue NewBP = recoverFramePointer(DAG, Fn, IncomingEBP);
17026 Chain = DAG.getCopyToReg(Chain, dl, RegInfo->getBaseRegister(), NewBP);
17028 // Reload the spilled EBP value, now that the stack and base pointers are
17030 X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
17031 X86FI->setHasSEHFramePtrSave(true);
17032 int FI = MF.getFrameInfo()->CreateSpillStackObject(SlotSize, SlotSize);
17033 X86FI->setSEHFramePtrSaveIndex(FI);
17034 SDValue NewFP = DAG.getLoad(VT, dl, Chain, DAG.getFrameIndex(FI, VT),
17035 MachinePointerInfo(), false, false, false,
17036 VT.getScalarSizeInBits() / 8);
17037 Chain = DAG.getCopyToReg(NewFP, dl, FrameReg, NewFP);
17043 static SDValue MarkEHRegistrationNode(SDValue Op, SelectionDAG &DAG) {
17044 MachineFunction &MF = DAG.getMachineFunction();
17045 SDValue Chain = Op.getOperand(0);
17046 SDValue RegNode = Op.getOperand(2);
17047 WinEHFuncInfo *EHInfo = MF.getWinEHFuncInfo();
17049 report_fatal_error("EH registrations only live in functions using WinEH");
17051 // Cast the operand to an alloca, and remember the frame index.
17052 auto *FINode = dyn_cast<FrameIndexSDNode>(RegNode);
17054 report_fatal_error("llvm.x86.seh.ehregnode expects a static alloca");
17055 EHInfo->EHRegNodeFrameIndex = FINode->getIndex();
17057 // Return the chain operand without making any DAG nodes.
17061 /// \brief Lower intrinsics for TRUNCATE_TO_MEM case
17062 /// return truncate Store/MaskedStore Node
17063 static SDValue LowerINTRINSIC_TRUNCATE_TO_MEM(const SDValue & Op,
17067 SDValue Mask = Op.getOperand(4);
17068 SDValue DataToTruncate = Op.getOperand(3);
17069 SDValue Addr = Op.getOperand(2);
17070 SDValue Chain = Op.getOperand(0);
17072 MVT VT = DataToTruncate.getSimpleValueType();
17073 MVT SVT = MVT::getVectorVT(ElementType, VT.getVectorNumElements());
17075 if (isAllOnesConstant(Mask)) // return just a truncate store
17076 return DAG.getTruncStore(Chain, dl, DataToTruncate, Addr,
17077 MachinePointerInfo(), SVT, false, false,
17078 SVT.getScalarSizeInBits()/8);
17080 MVT MaskVT = MVT::getVectorVT(MVT::i1, VT.getVectorNumElements());
17081 MVT BitcastVT = MVT::getVectorVT(MVT::i1,
17082 Mask.getSimpleValueType().getSizeInBits());
17083 // In case when MaskVT equals v2i1 or v4i1, low 2 or 4 elements
17084 // are extracted by EXTRACT_SUBVECTOR.
17085 SDValue VMask = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, MaskVT,
17086 DAG.getBitcast(BitcastVT, Mask),
17087 DAG.getIntPtrConstant(0, dl));
17089 MachineMemOperand *MMO = DAG.getMachineFunction().
17090 getMachineMemOperand(MachinePointerInfo(),
17091 MachineMemOperand::MOStore, SVT.getStoreSize(),
17092 SVT.getScalarSizeInBits()/8);
17094 return DAG.getMaskedStore(Chain, dl, DataToTruncate, Addr,
17095 VMask, SVT, MMO, true);
17098 static SDValue LowerINTRINSIC_W_CHAIN(SDValue Op, const X86Subtarget *Subtarget,
17099 SelectionDAG &DAG) {
17100 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue();
17102 const IntrinsicData* IntrData = getIntrinsicWithChain(IntNo);
17104 if (IntNo == llvm::Intrinsic::x86_seh_restoreframe)
17105 return LowerSEHRESTOREFRAME(Op, Subtarget, DAG);
17106 else if (IntNo == llvm::Intrinsic::x86_seh_ehregnode)
17107 return MarkEHRegistrationNode(Op, DAG);
17112 switch(IntrData->Type) {
17113 default: llvm_unreachable("Unknown Intrinsic Type");
17116 // Emit the node with the right value type.
17117 SDVTList VTs = DAG.getVTList(Op->getValueType(0), MVT::Glue, MVT::Other);
17118 SDValue Result = DAG.getNode(IntrData->Opc0, dl, VTs, Op.getOperand(0));
17120 // If the value returned by RDRAND/RDSEED was valid (CF=1), return 1.
17121 // Otherwise return the value from Rand, which is always 0, casted to i32.
17122 SDValue Ops[] = { DAG.getZExtOrTrunc(Result, dl, Op->getValueType(1)),
17123 DAG.getConstant(1, dl, Op->getValueType(1)),
17124 DAG.getConstant(X86::COND_B, dl, MVT::i32),
17125 SDValue(Result.getNode(), 1) };
17126 SDValue isValid = DAG.getNode(X86ISD::CMOV, dl,
17127 DAG.getVTList(Op->getValueType(1), MVT::Glue),
17130 // Return { result, isValid, chain }.
17131 return DAG.getNode(ISD::MERGE_VALUES, dl, Op->getVTList(), Result, isValid,
17132 SDValue(Result.getNode(), 2));
17135 //gather(v1, mask, index, base, scale);
17136 SDValue Chain = Op.getOperand(0);
17137 SDValue Src = Op.getOperand(2);
17138 SDValue Base = Op.getOperand(3);
17139 SDValue Index = Op.getOperand(4);
17140 SDValue Mask = Op.getOperand(5);
17141 SDValue Scale = Op.getOperand(6);
17142 return getGatherNode(IntrData->Opc0, Op, DAG, Src, Mask, Base, Index, Scale,
17146 //scatter(base, mask, index, v1, scale);
17147 SDValue Chain = Op.getOperand(0);
17148 SDValue Base = Op.getOperand(2);
17149 SDValue Mask = Op.getOperand(3);
17150 SDValue Index = Op.getOperand(4);
17151 SDValue Src = Op.getOperand(5);
17152 SDValue Scale = Op.getOperand(6);
17153 return getScatterNode(IntrData->Opc0, Op, DAG, Src, Mask, Base, Index,
17157 SDValue Hint = Op.getOperand(6);
17158 unsigned HintVal = cast<ConstantSDNode>(Hint)->getZExtValue();
17159 assert(HintVal < 2 && "Wrong prefetch hint in intrinsic: should be 0 or 1");
17160 unsigned Opcode = (HintVal ? IntrData->Opc1 : IntrData->Opc0);
17161 SDValue Chain = Op.getOperand(0);
17162 SDValue Mask = Op.getOperand(2);
17163 SDValue Index = Op.getOperand(3);
17164 SDValue Base = Op.getOperand(4);
17165 SDValue Scale = Op.getOperand(5);
17166 return getPrefetchNode(Opcode, Op, DAG, Mask, Base, Index, Scale, Chain);
17168 // Read Time Stamp Counter (RDTSC) and Processor ID (RDTSCP).
17170 SmallVector<SDValue, 2> Results;
17171 getReadTimeStampCounter(Op.getNode(), dl, IntrData->Opc0, DAG, Subtarget,
17173 return DAG.getMergeValues(Results, dl);
17175 // Read Performance Monitoring Counters.
17177 SmallVector<SDValue, 2> Results;
17178 getReadPerformanceCounter(Op.getNode(), dl, DAG, Subtarget, Results);
17179 return DAG.getMergeValues(Results, dl);
17181 // XTEST intrinsics.
17183 SDVTList VTs = DAG.getVTList(Op->getValueType(0), MVT::Other);
17184 SDValue InTrans = DAG.getNode(IntrData->Opc0, dl, VTs, Op.getOperand(0));
17185 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
17186 DAG.getConstant(X86::COND_NE, dl, MVT::i8),
17188 SDValue Ret = DAG.getNode(ISD::ZERO_EXTEND, dl, Op->getValueType(0), SetCC);
17189 return DAG.getNode(ISD::MERGE_VALUES, dl, Op->getVTList(),
17190 Ret, SDValue(InTrans.getNode(), 1));
17194 SmallVector<SDValue, 2> Results;
17195 SDVTList CFVTs = DAG.getVTList(Op->getValueType(0), MVT::Other);
17196 SDVTList VTs = DAG.getVTList(Op.getOperand(3)->getValueType(0), MVT::Other);
17197 SDValue GenCF = DAG.getNode(X86ISD::ADD, dl, CFVTs, Op.getOperand(2),
17198 DAG.getConstant(-1, dl, MVT::i8));
17199 SDValue Res = DAG.getNode(IntrData->Opc0, dl, VTs, Op.getOperand(3),
17200 Op.getOperand(4), GenCF.getValue(1));
17201 SDValue Store = DAG.getStore(Op.getOperand(0), dl, Res.getValue(0),
17202 Op.getOperand(5), MachinePointerInfo(),
17204 SDValue SetCC = DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
17205 DAG.getConstant(X86::COND_B, dl, MVT::i8),
17207 Results.push_back(SetCC);
17208 Results.push_back(Store);
17209 return DAG.getMergeValues(Results, dl);
17211 case COMPRESS_TO_MEM: {
17213 SDValue Mask = Op.getOperand(4);
17214 SDValue DataToCompress = Op.getOperand(3);
17215 SDValue Addr = Op.getOperand(2);
17216 SDValue Chain = Op.getOperand(0);
17218 MVT VT = DataToCompress.getSimpleValueType();
17219 if (isAllOnesConstant(Mask)) // return just a store
17220 return DAG.getStore(Chain, dl, DataToCompress, Addr,
17221 MachinePointerInfo(), false, false,
17222 VT.getScalarSizeInBits()/8);
17224 SDValue Compressed =
17225 getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, DataToCompress),
17226 Mask, DAG.getUNDEF(VT), Subtarget, DAG);
17227 return DAG.getStore(Chain, dl, Compressed, Addr,
17228 MachinePointerInfo(), false, false,
17229 VT.getScalarSizeInBits()/8);
17231 case TRUNCATE_TO_MEM_VI8:
17232 return LowerINTRINSIC_TRUNCATE_TO_MEM(Op, DAG, MVT::i8);
17233 case TRUNCATE_TO_MEM_VI16:
17234 return LowerINTRINSIC_TRUNCATE_TO_MEM(Op, DAG, MVT::i16);
17235 case TRUNCATE_TO_MEM_VI32:
17236 return LowerINTRINSIC_TRUNCATE_TO_MEM(Op, DAG, MVT::i32);
17237 case EXPAND_FROM_MEM: {
17239 SDValue Mask = Op.getOperand(4);
17240 SDValue PassThru = Op.getOperand(3);
17241 SDValue Addr = Op.getOperand(2);
17242 SDValue Chain = Op.getOperand(0);
17243 MVT VT = Op.getSimpleValueType();
17245 if (isAllOnesConstant(Mask)) // return just a load
17246 return DAG.getLoad(VT, dl, Chain, Addr, MachinePointerInfo(), false, false,
17247 false, VT.getScalarSizeInBits()/8);
17249 SDValue DataToExpand = DAG.getLoad(VT, dl, Chain, Addr, MachinePointerInfo(),
17250 false, false, false,
17251 VT.getScalarSizeInBits()/8);
17253 SDValue Results[] = {
17254 getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT, DataToExpand),
17255 Mask, PassThru, Subtarget, DAG), Chain};
17256 return DAG.getMergeValues(Results, dl);
17261 SDValue X86TargetLowering::LowerRETURNADDR(SDValue Op,
17262 SelectionDAG &DAG) const {
17263 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
17264 MFI->setReturnAddressIsTaken(true);
17266 if (verifyReturnAddressArgumentIsConstant(Op, DAG))
17269 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
17271 EVT PtrVT = getPointerTy(DAG.getDataLayout());
17274 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
17275 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17276 SDValue Offset = DAG.getConstant(RegInfo->getSlotSize(), dl, PtrVT);
17277 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
17278 DAG.getNode(ISD::ADD, dl, PtrVT,
17279 FrameAddr, Offset),
17280 MachinePointerInfo(), false, false, false, 0);
17283 // Just load the return address.
17284 SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
17285 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
17286 RetAddrFI, MachinePointerInfo(), false, false, false, 0);
17289 SDValue X86TargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
17290 MachineFunction &MF = DAG.getMachineFunction();
17291 MachineFrameInfo *MFI = MF.getFrameInfo();
17292 X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
17293 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17294 EVT VT = Op.getValueType();
17296 MFI->setFrameAddressIsTaken(true);
17298 if (MF.getTarget().getMCAsmInfo()->usesWindowsCFI()) {
17299 // Depth > 0 makes no sense on targets which use Windows unwind codes. It
17300 // is not possible to crawl up the stack without looking at the unwind codes
17302 int FrameAddrIndex = FuncInfo->getFAIndex();
17303 if (!FrameAddrIndex) {
17304 // Set up a frame object for the return address.
17305 unsigned SlotSize = RegInfo->getSlotSize();
17306 FrameAddrIndex = MF.getFrameInfo()->CreateFixedObject(
17307 SlotSize, /*Offset=*/0, /*IsImmutable=*/false);
17308 FuncInfo->setFAIndex(FrameAddrIndex);
17310 return DAG.getFrameIndex(FrameAddrIndex, VT);
17313 unsigned FrameReg =
17314 RegInfo->getPtrSizedFrameRegister(DAG.getMachineFunction());
17315 SDLoc dl(Op); // FIXME probably not meaningful
17316 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
17317 assert(((FrameReg == X86::RBP && VT == MVT::i64) ||
17318 (FrameReg == X86::EBP && VT == MVT::i32)) &&
17319 "Invalid Frame Register!");
17320 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
17322 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
17323 MachinePointerInfo(),
17324 false, false, false, 0);
17328 // FIXME? Maybe this could be a TableGen attribute on some registers and
17329 // this table could be generated automatically from RegInfo.
17330 unsigned X86TargetLowering::getRegisterByName(const char* RegName, EVT VT,
17331 SelectionDAG &DAG) const {
17332 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
17333 const MachineFunction &MF = DAG.getMachineFunction();
17335 unsigned Reg = StringSwitch<unsigned>(RegName)
17336 .Case("esp", X86::ESP)
17337 .Case("rsp", X86::RSP)
17338 .Case("ebp", X86::EBP)
17339 .Case("rbp", X86::RBP)
17342 if (Reg == X86::EBP || Reg == X86::RBP) {
17343 if (!TFI.hasFP(MF))
17344 report_fatal_error("register " + StringRef(RegName) +
17345 " is allocatable: function has no frame pointer");
17348 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17349 unsigned FrameReg =
17350 RegInfo->getPtrSizedFrameRegister(DAG.getMachineFunction());
17351 assert((FrameReg == X86::EBP || FrameReg == X86::RBP) &&
17352 "Invalid Frame Register!");
17360 report_fatal_error("Invalid register name global variable");
17363 SDValue X86TargetLowering::LowerFRAME_TO_ARGS_OFFSET(SDValue Op,
17364 SelectionDAG &DAG) const {
17365 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17366 return DAG.getIntPtrConstant(2 * RegInfo->getSlotSize(), SDLoc(Op));
17369 unsigned X86TargetLowering::getExceptionPointerRegister(
17370 const Constant *PersonalityFn) const {
17371 if (classifyEHPersonality(PersonalityFn) == EHPersonality::CoreCLR)
17372 return Subtarget->isTarget64BitLP64() ? X86::RDX : X86::EDX;
17374 return Subtarget->isTarget64BitLP64() ? X86::RAX : X86::EAX;
17377 unsigned X86TargetLowering::getExceptionSelectorRegister(
17378 const Constant *PersonalityFn) const {
17379 // Funclet personalities don't use selectors (the runtime does the selection).
17380 assert(!isFuncletEHPersonality(classifyEHPersonality(PersonalityFn)));
17381 return Subtarget->isTarget64BitLP64() ? X86::RDX : X86::EDX;
17384 SDValue X86TargetLowering::LowerEH_RETURN(SDValue Op, SelectionDAG &DAG) const {
17385 SDValue Chain = Op.getOperand(0);
17386 SDValue Offset = Op.getOperand(1);
17387 SDValue Handler = Op.getOperand(2);
17390 EVT PtrVT = getPointerTy(DAG.getDataLayout());
17391 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
17392 unsigned FrameReg = RegInfo->getFrameRegister(DAG.getMachineFunction());
17393 assert(((FrameReg == X86::RBP && PtrVT == MVT::i64) ||
17394 (FrameReg == X86::EBP && PtrVT == MVT::i32)) &&
17395 "Invalid Frame Register!");
17396 SDValue Frame = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, PtrVT);
17397 unsigned StoreAddrReg = (PtrVT == MVT::i64) ? X86::RCX : X86::ECX;
17399 SDValue StoreAddr = DAG.getNode(ISD::ADD, dl, PtrVT, Frame,
17400 DAG.getIntPtrConstant(RegInfo->getSlotSize(),
17402 StoreAddr = DAG.getNode(ISD::ADD, dl, PtrVT, StoreAddr, Offset);
17403 Chain = DAG.getStore(Chain, dl, Handler, StoreAddr, MachinePointerInfo(),
17405 Chain = DAG.getCopyToReg(Chain, dl, StoreAddrReg, StoreAddr);
17407 return DAG.getNode(X86ISD::EH_RETURN, dl, MVT::Other, Chain,
17408 DAG.getRegister(StoreAddrReg, PtrVT));
17411 SDValue X86TargetLowering::lowerEH_SJLJ_SETJMP(SDValue Op,
17412 SelectionDAG &DAG) const {
17414 return DAG.getNode(X86ISD::EH_SJLJ_SETJMP, DL,
17415 DAG.getVTList(MVT::i32, MVT::Other),
17416 Op.getOperand(0), Op.getOperand(1));
17419 SDValue X86TargetLowering::lowerEH_SJLJ_LONGJMP(SDValue Op,
17420 SelectionDAG &DAG) const {
17422 return DAG.getNode(X86ISD::EH_SJLJ_LONGJMP, DL, MVT::Other,
17423 Op.getOperand(0), Op.getOperand(1));
17426 static SDValue LowerADJUST_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) {
17427 return Op.getOperand(0);
17430 SDValue X86TargetLowering::LowerINIT_TRAMPOLINE(SDValue Op,
17431 SelectionDAG &DAG) const {
17432 SDValue Root = Op.getOperand(0);
17433 SDValue Trmp = Op.getOperand(1); // trampoline
17434 SDValue FPtr = Op.getOperand(2); // nested function
17435 SDValue Nest = Op.getOperand(3); // 'nest' parameter value
17438 const Value *TrmpAddr = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
17439 const TargetRegisterInfo *TRI = Subtarget->getRegisterInfo();
17441 if (Subtarget->is64Bit()) {
17442 SDValue OutChains[6];
17444 // Large code-model.
17445 const unsigned char JMP64r = 0xFF; // 64-bit jmp through register opcode.
17446 const unsigned char MOV64ri = 0xB8; // X86::MOV64ri opcode.
17448 const unsigned char N86R10 = TRI->getEncodingValue(X86::R10) & 0x7;
17449 const unsigned char N86R11 = TRI->getEncodingValue(X86::R11) & 0x7;
17451 const unsigned char REX_WB = 0x40 | 0x08 | 0x01; // REX prefix
17453 // Load the pointer to the nested function into R11.
17454 unsigned OpCode = ((MOV64ri | N86R11) << 8) | REX_WB; // movabsq r11
17455 SDValue Addr = Trmp;
17456 OutChains[0] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, dl, MVT::i16),
17457 Addr, MachinePointerInfo(TrmpAddr),
17460 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17461 DAG.getConstant(2, dl, MVT::i64));
17462 OutChains[1] = DAG.getStore(Root, dl, FPtr, Addr,
17463 MachinePointerInfo(TrmpAddr, 2),
17466 // Load the 'nest' parameter value into R10.
17467 // R10 is specified in X86CallingConv.td
17468 OpCode = ((MOV64ri | N86R10) << 8) | REX_WB; // movabsq r10
17469 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17470 DAG.getConstant(10, dl, MVT::i64));
17471 OutChains[2] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, dl, MVT::i16),
17472 Addr, MachinePointerInfo(TrmpAddr, 10),
17475 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17476 DAG.getConstant(12, dl, MVT::i64));
17477 OutChains[3] = DAG.getStore(Root, dl, Nest, Addr,
17478 MachinePointerInfo(TrmpAddr, 12),
17481 // Jump to the nested function.
17482 OpCode = (JMP64r << 8) | REX_WB; // jmpq *...
17483 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17484 DAG.getConstant(20, dl, MVT::i64));
17485 OutChains[4] = DAG.getStore(Root, dl, DAG.getConstant(OpCode, dl, MVT::i16),
17486 Addr, MachinePointerInfo(TrmpAddr, 20),
17489 unsigned char ModRM = N86R11 | (4 << 3) | (3 << 6); // ...r11
17490 Addr = DAG.getNode(ISD::ADD, dl, MVT::i64, Trmp,
17491 DAG.getConstant(22, dl, MVT::i64));
17492 OutChains[5] = DAG.getStore(Root, dl, DAG.getConstant(ModRM, dl, MVT::i8),
17493 Addr, MachinePointerInfo(TrmpAddr, 22),
17496 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains);
17498 const Function *Func =
17499 cast<Function>(cast<SrcValueSDNode>(Op.getOperand(5))->getValue());
17500 CallingConv::ID CC = Func->getCallingConv();
17505 llvm_unreachable("Unsupported calling convention");
17506 case CallingConv::C:
17507 case CallingConv::X86_StdCall: {
17508 // Pass 'nest' parameter in ECX.
17509 // Must be kept in sync with X86CallingConv.td
17510 NestReg = X86::ECX;
17512 // Check that ECX wasn't needed by an 'inreg' parameter.
17513 FunctionType *FTy = Func->getFunctionType();
17514 const AttributeSet &Attrs = Func->getAttributes();
17516 if (!Attrs.isEmpty() && !Func->isVarArg()) {
17517 unsigned InRegCount = 0;
17520 for (FunctionType::param_iterator I = FTy->param_begin(),
17521 E = FTy->param_end(); I != E; ++I, ++Idx)
17522 if (Attrs.hasAttribute(Idx, Attribute::InReg)) {
17523 auto &DL = DAG.getDataLayout();
17524 // FIXME: should only count parameters that are lowered to integers.
17525 InRegCount += (DL.getTypeSizeInBits(*I) + 31) / 32;
17528 if (InRegCount > 2) {
17529 report_fatal_error("Nest register in use - reduce number of inreg"
17535 case CallingConv::X86_FastCall:
17536 case CallingConv::X86_ThisCall:
17537 case CallingConv::Fast:
17538 // Pass 'nest' parameter in EAX.
17539 // Must be kept in sync with X86CallingConv.td
17540 NestReg = X86::EAX;
17544 SDValue OutChains[4];
17545 SDValue Addr, Disp;
17547 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
17548 DAG.getConstant(10, dl, MVT::i32));
17549 Disp = DAG.getNode(ISD::SUB, dl, MVT::i32, FPtr, Addr);
17551 // This is storing the opcode for MOV32ri.
17552 const unsigned char MOV32ri = 0xB8; // X86::MOV32ri's opcode byte.
17553 const unsigned char N86Reg = TRI->getEncodingValue(NestReg) & 0x7;
17554 OutChains[0] = DAG.getStore(Root, dl,
17555 DAG.getConstant(MOV32ri|N86Reg, dl, MVT::i8),
17556 Trmp, MachinePointerInfo(TrmpAddr),
17559 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
17560 DAG.getConstant(1, dl, MVT::i32));
17561 OutChains[1] = DAG.getStore(Root, dl, Nest, Addr,
17562 MachinePointerInfo(TrmpAddr, 1),
17565 const unsigned char JMP = 0xE9; // jmp <32bit dst> opcode.
17566 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
17567 DAG.getConstant(5, dl, MVT::i32));
17568 OutChains[2] = DAG.getStore(Root, dl, DAG.getConstant(JMP, dl, MVT::i8),
17569 Addr, MachinePointerInfo(TrmpAddr, 5),
17572 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
17573 DAG.getConstant(6, dl, MVT::i32));
17574 OutChains[3] = DAG.getStore(Root, dl, Disp, Addr,
17575 MachinePointerInfo(TrmpAddr, 6),
17578 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains);
17582 SDValue X86TargetLowering::LowerFLT_ROUNDS_(SDValue Op,
17583 SelectionDAG &DAG) const {
17585 The rounding mode is in bits 11:10 of FPSR, and has the following
17587 00 Round to nearest
17592 FLT_ROUNDS, on the other hand, expects the following:
17599 To perform the conversion, we do:
17600 (((((FPSR & 0x800) >> 11) | ((FPSR & 0x400) >> 9)) + 1) & 3)
17603 MachineFunction &MF = DAG.getMachineFunction();
17604 const TargetFrameLowering &TFI = *Subtarget->getFrameLowering();
17605 unsigned StackAlignment = TFI.getStackAlignment();
17606 MVT VT = Op.getSimpleValueType();
17609 // Save FP Control Word to stack slot
17610 int SSFI = MF.getFrameInfo()->CreateStackObject(2, StackAlignment, false);
17611 SDValue StackSlot =
17612 DAG.getFrameIndex(SSFI, getPointerTy(DAG.getDataLayout()));
17614 MachineMemOperand *MMO =
17615 MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(MF, SSFI),
17616 MachineMemOperand::MOStore, 2, 2);
17618 SDValue Ops[] = { DAG.getEntryNode(), StackSlot };
17619 SDValue Chain = DAG.getMemIntrinsicNode(X86ISD::FNSTCW16m, DL,
17620 DAG.getVTList(MVT::Other),
17621 Ops, MVT::i16, MMO);
17623 // Load FP Control Word from stack slot
17624 SDValue CWD = DAG.getLoad(MVT::i16, DL, Chain, StackSlot,
17625 MachinePointerInfo(), false, false, false, 0);
17627 // Transform as necessary
17629 DAG.getNode(ISD::SRL, DL, MVT::i16,
17630 DAG.getNode(ISD::AND, DL, MVT::i16,
17631 CWD, DAG.getConstant(0x800, DL, MVT::i16)),
17632 DAG.getConstant(11, DL, MVT::i8));
17634 DAG.getNode(ISD::SRL, DL, MVT::i16,
17635 DAG.getNode(ISD::AND, DL, MVT::i16,
17636 CWD, DAG.getConstant(0x400, DL, MVT::i16)),
17637 DAG.getConstant(9, DL, MVT::i8));
17640 DAG.getNode(ISD::AND, DL, MVT::i16,
17641 DAG.getNode(ISD::ADD, DL, MVT::i16,
17642 DAG.getNode(ISD::OR, DL, MVT::i16, CWD1, CWD2),
17643 DAG.getConstant(1, DL, MVT::i16)),
17644 DAG.getConstant(3, DL, MVT::i16));
17646 return DAG.getNode((VT.getSizeInBits() < 16 ?
17647 ISD::TRUNCATE : ISD::ZERO_EXTEND), DL, VT, RetVal);
17650 /// \brief Lower a vector CTLZ using native supported vector CTLZ instruction.
17652 // 1. i32/i64 128/256-bit vector (native support require VLX) are expended
17653 // to 512-bit vector.
17654 // 2. i8/i16 vector implemented using dword LZCNT vector instruction
17655 // ( sub(trunc(lzcnt(zext32(x)))) ). In case zext32(x) is illegal,
17656 // split the vector, perform operation on it's Lo a Hi part and
17657 // concatenate the results.
17658 static SDValue LowerVectorCTLZ_AVX512(SDValue Op, SelectionDAG &DAG) {
17660 MVT VT = Op.getSimpleValueType();
17661 MVT EltVT = VT.getVectorElementType();
17662 unsigned NumElems = VT.getVectorNumElements();
17664 if (EltVT == MVT::i64 || EltVT == MVT::i32) {
17665 // Extend to 512 bit vector.
17666 assert((VT.is256BitVector() || VT.is128BitVector()) &&
17667 "Unsupported value type for operation");
17669 MVT NewVT = MVT::getVectorVT(EltVT, 512 / VT.getScalarSizeInBits());
17670 SDValue Vec512 = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, NewVT,
17671 DAG.getUNDEF(NewVT),
17673 DAG.getIntPtrConstant(0, dl));
17674 SDValue CtlzNode = DAG.getNode(ISD::CTLZ, dl, NewVT, Vec512);
17676 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, CtlzNode,
17677 DAG.getIntPtrConstant(0, dl));
17680 assert((EltVT == MVT::i8 || EltVT == MVT::i16) &&
17681 "Unsupported element type");
17683 if (16 < NumElems) {
17684 // Split vector, it's Lo and Hi parts will be handled in next iteration.
17686 std::tie(Lo, Hi) = DAG.SplitVector(Op.getOperand(0), dl);
17687 MVT OutVT = MVT::getVectorVT(EltVT, NumElems/2);
17689 Lo = DAG.getNode(Op.getOpcode(), dl, OutVT, Lo);
17690 Hi = DAG.getNode(Op.getOpcode(), dl, OutVT, Hi);
17692 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, Lo, Hi);
17695 MVT NewVT = MVT::getVectorVT(MVT::i32, NumElems);
17697 assert((NewVT.is256BitVector() || NewVT.is512BitVector()) &&
17698 "Unsupported value type for operation");
17700 // Use native supported vector instruction vplzcntd.
17701 Op = DAG.getNode(ISD::ZERO_EXTEND, dl, NewVT, Op.getOperand(0));
17702 SDValue CtlzNode = DAG.getNode(ISD::CTLZ, dl, NewVT, Op);
17703 SDValue TruncNode = DAG.getNode(ISD::TRUNCATE, dl, VT, CtlzNode);
17704 SDValue Delta = DAG.getConstant(32 - EltVT.getSizeInBits(), dl, VT);
17706 return DAG.getNode(ISD::SUB, dl, VT, TruncNode, Delta);
17709 static SDValue LowerCTLZ(SDValue Op, const X86Subtarget *Subtarget,
17710 SelectionDAG &DAG) {
17711 MVT VT = Op.getSimpleValueType();
17713 unsigned NumBits = VT.getSizeInBits();
17716 if (VT.isVector() && Subtarget->hasAVX512())
17717 return LowerVectorCTLZ_AVX512(Op, DAG);
17719 Op = Op.getOperand(0);
17720 if (VT == MVT::i8) {
17721 // Zero extend to i32 since there is not an i8 bsr.
17723 Op = DAG.getNode(ISD::ZERO_EXTEND, dl, OpVT, Op);
17726 // Issue a bsr (scan bits in reverse) which also sets EFLAGS.
17727 SDVTList VTs = DAG.getVTList(OpVT, MVT::i32);
17728 Op = DAG.getNode(X86ISD::BSR, dl, VTs, Op);
17730 // If src is zero (i.e. bsr sets ZF), returns NumBits.
17733 DAG.getConstant(NumBits + NumBits - 1, dl, OpVT),
17734 DAG.getConstant(X86::COND_E, dl, MVT::i8),
17737 Op = DAG.getNode(X86ISD::CMOV, dl, OpVT, Ops);
17739 // Finally xor with NumBits-1.
17740 Op = DAG.getNode(ISD::XOR, dl, OpVT, Op,
17741 DAG.getConstant(NumBits - 1, dl, OpVT));
17744 Op = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op);
17748 static SDValue LowerCTLZ_ZERO_UNDEF(SDValue Op, const X86Subtarget *Subtarget,
17749 SelectionDAG &DAG) {
17750 MVT VT = Op.getSimpleValueType();
17752 unsigned NumBits = VT.getSizeInBits();
17755 if (VT.isVector() && Subtarget->hasAVX512())
17756 return LowerVectorCTLZ_AVX512(Op, DAG);
17758 Op = Op.getOperand(0);
17759 if (VT == MVT::i8) {
17760 // Zero extend to i32 since there is not an i8 bsr.
17762 Op = DAG.getNode(ISD::ZERO_EXTEND, dl, OpVT, Op);
17765 // Issue a bsr (scan bits in reverse).
17766 SDVTList VTs = DAG.getVTList(OpVT, MVT::i32);
17767 Op = DAG.getNode(X86ISD::BSR, dl, VTs, Op);
17769 // And xor with NumBits-1.
17770 Op = DAG.getNode(ISD::XOR, dl, OpVT, Op,
17771 DAG.getConstant(NumBits - 1, dl, OpVT));
17774 Op = DAG.getNode(ISD::TRUNCATE, dl, MVT::i8, Op);
17778 static SDValue LowerCTTZ(SDValue Op, SelectionDAG &DAG) {
17779 MVT VT = Op.getSimpleValueType();
17780 unsigned NumBits = VT.getScalarSizeInBits();
17783 if (VT.isVector()) {
17784 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
17786 SDValue N0 = Op.getOperand(0);
17787 SDValue Zero = DAG.getConstant(0, dl, VT);
17789 // lsb(x) = (x & -x)
17790 SDValue LSB = DAG.getNode(ISD::AND, dl, VT, N0,
17791 DAG.getNode(ISD::SUB, dl, VT, Zero, N0));
17793 // cttz_undef(x) = (width - 1) - ctlz(lsb)
17794 if (Op.getOpcode() == ISD::CTTZ_ZERO_UNDEF &&
17795 TLI.isOperationLegal(ISD::CTLZ, VT)) {
17796 SDValue WidthMinusOne = DAG.getConstant(NumBits - 1, dl, VT);
17797 return DAG.getNode(ISD::SUB, dl, VT, WidthMinusOne,
17798 DAG.getNode(ISD::CTLZ, dl, VT, LSB));
17801 // cttz(x) = ctpop(lsb - 1)
17802 SDValue One = DAG.getConstant(1, dl, VT);
17803 return DAG.getNode(ISD::CTPOP, dl, VT,
17804 DAG.getNode(ISD::SUB, dl, VT, LSB, One));
17807 assert(Op.getOpcode() == ISD::CTTZ &&
17808 "Only scalar CTTZ requires custom lowering");
17810 // Issue a bsf (scan bits forward) which also sets EFLAGS.
17811 SDVTList VTs = DAG.getVTList(VT, MVT::i32);
17812 Op = DAG.getNode(X86ISD::BSF, dl, VTs, Op.getOperand(0));
17814 // If src is zero (i.e. bsf sets ZF), returns NumBits.
17817 DAG.getConstant(NumBits, dl, VT),
17818 DAG.getConstant(X86::COND_E, dl, MVT::i8),
17821 return DAG.getNode(X86ISD::CMOV, dl, VT, Ops);
17824 // Lower256IntArith - Break a 256-bit integer operation into two new 128-bit
17825 // ones, and then concatenate the result back.
17826 static SDValue Lower256IntArith(SDValue Op, SelectionDAG &DAG) {
17827 MVT VT = Op.getSimpleValueType();
17829 assert(VT.is256BitVector() && VT.isInteger() &&
17830 "Unsupported value type for operation");
17832 unsigned NumElems = VT.getVectorNumElements();
17835 // Extract the LHS vectors
17836 SDValue LHS = Op.getOperand(0);
17837 SDValue LHS1 = Extract128BitVector(LHS, 0, DAG, dl);
17838 SDValue LHS2 = Extract128BitVector(LHS, NumElems/2, DAG, dl);
17840 // Extract the RHS vectors
17841 SDValue RHS = Op.getOperand(1);
17842 SDValue RHS1 = Extract128BitVector(RHS, 0, DAG, dl);
17843 SDValue RHS2 = Extract128BitVector(RHS, NumElems/2, DAG, dl);
17845 MVT EltVT = VT.getVectorElementType();
17846 MVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
17848 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
17849 DAG.getNode(Op.getOpcode(), dl, NewVT, LHS1, RHS1),
17850 DAG.getNode(Op.getOpcode(), dl, NewVT, LHS2, RHS2));
17853 static SDValue LowerADD(SDValue Op, SelectionDAG &DAG) {
17854 if (Op.getValueType() == MVT::i1)
17855 return DAG.getNode(ISD::XOR, SDLoc(Op), Op.getValueType(),
17856 Op.getOperand(0), Op.getOperand(1));
17857 assert(Op.getSimpleValueType().is256BitVector() &&
17858 Op.getSimpleValueType().isInteger() &&
17859 "Only handle AVX 256-bit vector integer operation");
17860 return Lower256IntArith(Op, DAG);
17863 static SDValue LowerSUB(SDValue Op, SelectionDAG &DAG) {
17864 if (Op.getValueType() == MVT::i1)
17865 return DAG.getNode(ISD::XOR, SDLoc(Op), Op.getValueType(),
17866 Op.getOperand(0), Op.getOperand(1));
17867 assert(Op.getSimpleValueType().is256BitVector() &&
17868 Op.getSimpleValueType().isInteger() &&
17869 "Only handle AVX 256-bit vector integer operation");
17870 return Lower256IntArith(Op, DAG);
17873 static SDValue LowerMINMAX(SDValue Op, SelectionDAG &DAG) {
17874 assert(Op.getSimpleValueType().is256BitVector() &&
17875 Op.getSimpleValueType().isInteger() &&
17876 "Only handle AVX 256-bit vector integer operation");
17877 return Lower256IntArith(Op, DAG);
17880 static SDValue LowerMUL(SDValue Op, const X86Subtarget *Subtarget,
17881 SelectionDAG &DAG) {
17883 MVT VT = Op.getSimpleValueType();
17886 return DAG.getNode(ISD::AND, dl, VT, Op.getOperand(0), Op.getOperand(1));
17888 // Decompose 256-bit ops into smaller 128-bit ops.
17889 if (VT.is256BitVector() && !Subtarget->hasInt256())
17890 return Lower256IntArith(Op, DAG);
17892 SDValue A = Op.getOperand(0);
17893 SDValue B = Op.getOperand(1);
17895 // Lower v16i8/v32i8 mul as promotion to v8i16/v16i16 vector
17896 // pairs, multiply and truncate.
17897 if (VT == MVT::v16i8 || VT == MVT::v32i8) {
17898 if (Subtarget->hasInt256()) {
17899 if (VT == MVT::v32i8) {
17900 MVT SubVT = MVT::getVectorVT(MVT::i8, VT.getVectorNumElements() / 2);
17901 SDValue Lo = DAG.getIntPtrConstant(0, dl);
17902 SDValue Hi = DAG.getIntPtrConstant(VT.getVectorNumElements() / 2, dl);
17903 SDValue ALo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, A, Lo);
17904 SDValue BLo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, B, Lo);
17905 SDValue AHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, A, Hi);
17906 SDValue BHi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, B, Hi);
17907 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT,
17908 DAG.getNode(ISD::MUL, dl, SubVT, ALo, BLo),
17909 DAG.getNode(ISD::MUL, dl, SubVT, AHi, BHi));
17912 MVT ExVT = MVT::getVectorVT(MVT::i16, VT.getVectorNumElements());
17913 return DAG.getNode(
17914 ISD::TRUNCATE, dl, VT,
17915 DAG.getNode(ISD::MUL, dl, ExVT,
17916 DAG.getNode(ISD::SIGN_EXTEND, dl, ExVT, A),
17917 DAG.getNode(ISD::SIGN_EXTEND, dl, ExVT, B)));
17920 assert(VT == MVT::v16i8 &&
17921 "Pre-AVX2 support only supports v16i8 multiplication");
17922 MVT ExVT = MVT::v8i16;
17924 // Extract the lo parts and sign extend to i16
17926 if (Subtarget->hasSSE41()) {
17927 ALo = DAG.getNode(X86ISD::VSEXT, dl, ExVT, A);
17928 BLo = DAG.getNode(X86ISD::VSEXT, dl, ExVT, B);
17930 const int ShufMask[] = {-1, 0, -1, 1, -1, 2, -1, 3,
17931 -1, 4, -1, 5, -1, 6, -1, 7};
17932 ALo = DAG.getVectorShuffle(VT, dl, A, A, ShufMask);
17933 BLo = DAG.getVectorShuffle(VT, dl, B, B, ShufMask);
17934 ALo = DAG.getBitcast(ExVT, ALo);
17935 BLo = DAG.getBitcast(ExVT, BLo);
17936 ALo = DAG.getNode(ISD::SRA, dl, ExVT, ALo, DAG.getConstant(8, dl, ExVT));
17937 BLo = DAG.getNode(ISD::SRA, dl, ExVT, BLo, DAG.getConstant(8, dl, ExVT));
17940 // Extract the hi parts and sign extend to i16
17942 if (Subtarget->hasSSE41()) {
17943 const int ShufMask[] = {8, 9, 10, 11, 12, 13, 14, 15,
17944 -1, -1, -1, -1, -1, -1, -1, -1};
17945 AHi = DAG.getVectorShuffle(VT, dl, A, A, ShufMask);
17946 BHi = DAG.getVectorShuffle(VT, dl, B, B, ShufMask);
17947 AHi = DAG.getNode(X86ISD::VSEXT, dl, ExVT, AHi);
17948 BHi = DAG.getNode(X86ISD::VSEXT, dl, ExVT, BHi);
17950 const int ShufMask[] = {-1, 8, -1, 9, -1, 10, -1, 11,
17951 -1, 12, -1, 13, -1, 14, -1, 15};
17952 AHi = DAG.getVectorShuffle(VT, dl, A, A, ShufMask);
17953 BHi = DAG.getVectorShuffle(VT, dl, B, B, ShufMask);
17954 AHi = DAG.getBitcast(ExVT, AHi);
17955 BHi = DAG.getBitcast(ExVT, BHi);
17956 AHi = DAG.getNode(ISD::SRA, dl, ExVT, AHi, DAG.getConstant(8, dl, ExVT));
17957 BHi = DAG.getNode(ISD::SRA, dl, ExVT, BHi, DAG.getConstant(8, dl, ExVT));
17960 // Multiply, mask the lower 8bits of the lo/hi results and pack
17961 SDValue RLo = DAG.getNode(ISD::MUL, dl, ExVT, ALo, BLo);
17962 SDValue RHi = DAG.getNode(ISD::MUL, dl, ExVT, AHi, BHi);
17963 RLo = DAG.getNode(ISD::AND, dl, ExVT, RLo, DAG.getConstant(255, dl, ExVT));
17964 RHi = DAG.getNode(ISD::AND, dl, ExVT, RHi, DAG.getConstant(255, dl, ExVT));
17965 return DAG.getNode(X86ISD::PACKUS, dl, VT, RLo, RHi);
17968 // Lower v4i32 mul as 2x shuffle, 2x pmuludq, 2x shuffle.
17969 if (VT == MVT::v4i32) {
17970 assert(Subtarget->hasSSE2() && !Subtarget->hasSSE41() &&
17971 "Should not custom lower when pmuldq is available!");
17973 // Extract the odd parts.
17974 static const int UnpackMask[] = { 1, -1, 3, -1 };
17975 SDValue Aodds = DAG.getVectorShuffle(VT, dl, A, A, UnpackMask);
17976 SDValue Bodds = DAG.getVectorShuffle(VT, dl, B, B, UnpackMask);
17978 // Multiply the even parts.
17979 SDValue Evens = DAG.getNode(X86ISD::PMULUDQ, dl, MVT::v2i64, A, B);
17980 // Now multiply odd parts.
17981 SDValue Odds = DAG.getNode(X86ISD::PMULUDQ, dl, MVT::v2i64, Aodds, Bodds);
17983 Evens = DAG.getBitcast(VT, Evens);
17984 Odds = DAG.getBitcast(VT, Odds);
17986 // Merge the two vectors back together with a shuffle. This expands into 2
17988 static const int ShufMask[] = { 0, 4, 2, 6 };
17989 return DAG.getVectorShuffle(VT, dl, Evens, Odds, ShufMask);
17992 assert((VT == MVT::v2i64 || VT == MVT::v4i64 || VT == MVT::v8i64) &&
17993 "Only know how to lower V2I64/V4I64/V8I64 multiply");
17995 // Ahi = psrlqi(a, 32);
17996 // Bhi = psrlqi(b, 32);
17998 // AloBlo = pmuludq(a, b);
17999 // AloBhi = pmuludq(a, Bhi);
18000 // AhiBlo = pmuludq(Ahi, b);
18002 // AloBhi = psllqi(AloBhi, 32);
18003 // AhiBlo = psllqi(AhiBlo, 32);
18004 // return AloBlo + AloBhi + AhiBlo;
18006 SDValue Ahi = getTargetVShiftByConstNode(X86ISD::VSRLI, dl, VT, A, 32, DAG);
18007 SDValue Bhi = getTargetVShiftByConstNode(X86ISD::VSRLI, dl, VT, B, 32, DAG);
18009 SDValue AhiBlo = Ahi;
18010 SDValue AloBhi = Bhi;
18011 // Bit cast to 32-bit vectors for MULUDQ
18012 MVT MulVT = (VT == MVT::v2i64) ? MVT::v4i32 :
18013 (VT == MVT::v4i64) ? MVT::v8i32 : MVT::v16i32;
18014 A = DAG.getBitcast(MulVT, A);
18015 B = DAG.getBitcast(MulVT, B);
18016 Ahi = DAG.getBitcast(MulVT, Ahi);
18017 Bhi = DAG.getBitcast(MulVT, Bhi);
18019 SDValue AloBlo = DAG.getNode(X86ISD::PMULUDQ, dl, VT, A, B);
18020 // After shifting right const values the result may be all-zero.
18021 if (!ISD::isBuildVectorAllZeros(Ahi.getNode())) {
18022 AhiBlo = DAG.getNode(X86ISD::PMULUDQ, dl, VT, Ahi, B);
18023 AhiBlo = getTargetVShiftByConstNode(X86ISD::VSHLI, dl, VT, AhiBlo, 32, DAG);
18025 if (!ISD::isBuildVectorAllZeros(Bhi.getNode())) {
18026 AloBhi = DAG.getNode(X86ISD::PMULUDQ, dl, VT, A, Bhi);
18027 AloBhi = getTargetVShiftByConstNode(X86ISD::VSHLI, dl, VT, AloBhi, 32, DAG);
18030 SDValue Res = DAG.getNode(ISD::ADD, dl, VT, AloBlo, AloBhi);
18031 return DAG.getNode(ISD::ADD, dl, VT, Res, AhiBlo);
18034 SDValue X86TargetLowering::LowerWin64_i128OP(SDValue Op, SelectionDAG &DAG) const {
18035 assert(Subtarget->isTargetWin64() && "Unexpected target");
18036 EVT VT = Op.getValueType();
18037 assert(VT.isInteger() && VT.getSizeInBits() == 128 &&
18038 "Unexpected return type for lowering");
18042 switch (Op->getOpcode()) {
18043 default: llvm_unreachable("Unexpected request for libcall!");
18044 case ISD::SDIV: isSigned = true; LC = RTLIB::SDIV_I128; break;
18045 case ISD::UDIV: isSigned = false; LC = RTLIB::UDIV_I128; break;
18046 case ISD::SREM: isSigned = true; LC = RTLIB::SREM_I128; break;
18047 case ISD::UREM: isSigned = false; LC = RTLIB::UREM_I128; break;
18048 case ISD::SDIVREM: isSigned = true; LC = RTLIB::SDIVREM_I128; break;
18049 case ISD::UDIVREM: isSigned = false; LC = RTLIB::UDIVREM_I128; break;
18053 SDValue InChain = DAG.getEntryNode();
18055 TargetLowering::ArgListTy Args;
18056 TargetLowering::ArgListEntry Entry;
18057 for (unsigned i = 0, e = Op->getNumOperands(); i != e; ++i) {
18058 EVT ArgVT = Op->getOperand(i).getValueType();
18059 assert(ArgVT.isInteger() && ArgVT.getSizeInBits() == 128 &&
18060 "Unexpected argument type for lowering");
18061 SDValue StackPtr = DAG.CreateStackTemporary(ArgVT, 16);
18062 Entry.Node = StackPtr;
18063 InChain = DAG.getStore(InChain, dl, Op->getOperand(i), StackPtr, MachinePointerInfo(),
18065 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
18066 Entry.Ty = PointerType::get(ArgTy,0);
18067 Entry.isSExt = false;
18068 Entry.isZExt = false;
18069 Args.push_back(Entry);
18072 SDValue Callee = DAG.getExternalSymbol(getLibcallName(LC),
18073 getPointerTy(DAG.getDataLayout()));
18075 TargetLowering::CallLoweringInfo CLI(DAG);
18076 CLI.setDebugLoc(dl).setChain(InChain)
18077 .setCallee(getLibcallCallingConv(LC),
18078 static_cast<EVT>(MVT::v2i64).getTypeForEVT(*DAG.getContext()),
18079 Callee, std::move(Args), 0)
18080 .setInRegister().setSExtResult(isSigned).setZExtResult(!isSigned);
18082 std::pair<SDValue, SDValue> CallInfo = LowerCallTo(CLI);
18083 return DAG.getBitcast(VT, CallInfo.first);
18086 static SDValue LowerMUL_LOHI(SDValue Op, const X86Subtarget *Subtarget,
18087 SelectionDAG &DAG) {
18088 SDValue Op0 = Op.getOperand(0), Op1 = Op.getOperand(1);
18089 MVT VT = Op0.getSimpleValueType();
18092 assert((VT == MVT::v4i32 && Subtarget->hasSSE2()) ||
18093 (VT == MVT::v8i32 && Subtarget->hasInt256()));
18095 // PMULxD operations multiply each even value (starting at 0) of LHS with
18096 // the related value of RHS and produce a widen result.
18097 // E.g., PMULUDQ <4 x i32> <a|b|c|d>, <4 x i32> <e|f|g|h>
18098 // => <2 x i64> <ae|cg>
18100 // In other word, to have all the results, we need to perform two PMULxD:
18101 // 1. one with the even values.
18102 // 2. one with the odd values.
18103 // To achieve #2, with need to place the odd values at an even position.
18105 // Place the odd value at an even position (basically, shift all values 1
18106 // step to the left):
18107 const int Mask[] = {1, -1, 3, -1, 5, -1, 7, -1};
18108 // <a|b|c|d> => <b|undef|d|undef>
18109 SDValue Odd0 = DAG.getVectorShuffle(VT, dl, Op0, Op0, Mask);
18110 // <e|f|g|h> => <f|undef|h|undef>
18111 SDValue Odd1 = DAG.getVectorShuffle(VT, dl, Op1, Op1, Mask);
18113 // Emit two multiplies, one for the lower 2 ints and one for the higher 2
18115 MVT MulVT = VT == MVT::v4i32 ? MVT::v2i64 : MVT::v4i64;
18116 bool IsSigned = Op->getOpcode() == ISD::SMUL_LOHI;
18118 (!IsSigned || !Subtarget->hasSSE41()) ? X86ISD::PMULUDQ : X86ISD::PMULDQ;
18119 // PMULUDQ <4 x i32> <a|b|c|d>, <4 x i32> <e|f|g|h>
18120 // => <2 x i64> <ae|cg>
18121 SDValue Mul1 = DAG.getBitcast(VT, DAG.getNode(Opcode, dl, MulVT, Op0, Op1));
18122 // PMULUDQ <4 x i32> <b|undef|d|undef>, <4 x i32> <f|undef|h|undef>
18123 // => <2 x i64> <bf|dh>
18124 SDValue Mul2 = DAG.getBitcast(VT, DAG.getNode(Opcode, dl, MulVT, Odd0, Odd1));
18126 // Shuffle it back into the right order.
18127 SDValue Highs, Lows;
18128 if (VT == MVT::v8i32) {
18129 const int HighMask[] = {1, 9, 3, 11, 5, 13, 7, 15};
18130 Highs = DAG.getVectorShuffle(VT, dl, Mul1, Mul2, HighMask);
18131 const int LowMask[] = {0, 8, 2, 10, 4, 12, 6, 14};
18132 Lows = DAG.getVectorShuffle(VT, dl, Mul1, Mul2, LowMask);
18134 const int HighMask[] = {1, 5, 3, 7};
18135 Highs = DAG.getVectorShuffle(VT, dl, Mul1, Mul2, HighMask);
18136 const int LowMask[] = {0, 4, 2, 6};
18137 Lows = DAG.getVectorShuffle(VT, dl, Mul1, Mul2, LowMask);
18140 // If we have a signed multiply but no PMULDQ fix up the high parts of a
18141 // unsigned multiply.
18142 if (IsSigned && !Subtarget->hasSSE41()) {
18143 SDValue ShAmt = DAG.getConstant(
18145 DAG.getTargetLoweringInfo().getShiftAmountTy(VT, DAG.getDataLayout()));
18146 SDValue T1 = DAG.getNode(ISD::AND, dl, VT,
18147 DAG.getNode(ISD::SRA, dl, VT, Op0, ShAmt), Op1);
18148 SDValue T2 = DAG.getNode(ISD::AND, dl, VT,
18149 DAG.getNode(ISD::SRA, dl, VT, Op1, ShAmt), Op0);
18151 SDValue Fixup = DAG.getNode(ISD::ADD, dl, VT, T1, T2);
18152 Highs = DAG.getNode(ISD::SUB, dl, VT, Highs, Fixup);
18155 // The first result of MUL_LOHI is actually the low value, followed by the
18157 SDValue Ops[] = {Lows, Highs};
18158 return DAG.getMergeValues(Ops, dl);
18161 // Return true if the required (according to Opcode) shift-imm form is natively
18162 // supported by the Subtarget
18163 static bool SupportedVectorShiftWithImm(MVT VT, const X86Subtarget *Subtarget,
18165 if (VT.getScalarSizeInBits() < 16)
18168 if (VT.is512BitVector() &&
18169 (VT.getScalarSizeInBits() > 16 || Subtarget->hasBWI()))
18172 bool LShift = VT.is128BitVector() ||
18173 (VT.is256BitVector() && Subtarget->hasInt256());
18175 bool AShift = LShift && (Subtarget->hasVLX() ||
18176 (VT != MVT::v2i64 && VT != MVT::v4i64));
18177 return (Opcode == ISD::SRA) ? AShift : LShift;
18180 // The shift amount is a variable, but it is the same for all vector lanes.
18181 // These instructions are defined together with shift-immediate.
18183 bool SupportedVectorShiftWithBaseAmnt(MVT VT, const X86Subtarget *Subtarget,
18185 return SupportedVectorShiftWithImm(VT, Subtarget, Opcode);
18188 // Return true if the required (according to Opcode) variable-shift form is
18189 // natively supported by the Subtarget
18190 static bool SupportedVectorVarShift(MVT VT, const X86Subtarget *Subtarget,
18193 if (!Subtarget->hasInt256() || VT.getScalarSizeInBits() < 16)
18196 // vXi16 supported only on AVX-512, BWI
18197 if (VT.getScalarSizeInBits() == 16 && !Subtarget->hasBWI())
18200 if (VT.is512BitVector() || Subtarget->hasVLX())
18203 bool LShift = VT.is128BitVector() || VT.is256BitVector();
18204 bool AShift = LShift && VT != MVT::v2i64 && VT != MVT::v4i64;
18205 return (Opcode == ISD::SRA) ? AShift : LShift;
18208 static SDValue LowerScalarImmediateShift(SDValue Op, SelectionDAG &DAG,
18209 const X86Subtarget *Subtarget) {
18210 MVT VT = Op.getSimpleValueType();
18212 SDValue R = Op.getOperand(0);
18213 SDValue Amt = Op.getOperand(1);
18215 unsigned X86Opc = (Op.getOpcode() == ISD::SHL) ? X86ISD::VSHLI :
18216 (Op.getOpcode() == ISD::SRL) ? X86ISD::VSRLI : X86ISD::VSRAI;
18218 auto ArithmeticShiftRight64 = [&](uint64_t ShiftAmt) {
18219 assert((VT == MVT::v2i64 || VT == MVT::v4i64) && "Unexpected SRA type");
18220 MVT ExVT = MVT::getVectorVT(MVT::i32, VT.getVectorNumElements() * 2);
18221 SDValue Ex = DAG.getBitcast(ExVT, R);
18223 if (ShiftAmt >= 32) {
18224 // Splat sign to upper i32 dst, and SRA upper i32 src to lower i32.
18226 getTargetVShiftByConstNode(X86ISD::VSRAI, dl, ExVT, Ex, 31, DAG);
18227 SDValue Lower = getTargetVShiftByConstNode(X86ISD::VSRAI, dl, ExVT, Ex,
18228 ShiftAmt - 32, DAG);
18229 if (VT == MVT::v2i64)
18230 Ex = DAG.getVectorShuffle(ExVT, dl, Upper, Lower, {5, 1, 7, 3});
18231 if (VT == MVT::v4i64)
18232 Ex = DAG.getVectorShuffle(ExVT, dl, Upper, Lower,
18233 {9, 1, 11, 3, 13, 5, 15, 7});
18235 // SRA upper i32, SHL whole i64 and select lower i32.
18236 SDValue Upper = getTargetVShiftByConstNode(X86ISD::VSRAI, dl, ExVT, Ex,
18239 getTargetVShiftByConstNode(X86ISD::VSRLI, dl, VT, R, ShiftAmt, DAG);
18240 Lower = DAG.getBitcast(ExVT, Lower);
18241 if (VT == MVT::v2i64)
18242 Ex = DAG.getVectorShuffle(ExVT, dl, Upper, Lower, {4, 1, 6, 3});
18243 if (VT == MVT::v4i64)
18244 Ex = DAG.getVectorShuffle(ExVT, dl, Upper, Lower,
18245 {8, 1, 10, 3, 12, 5, 14, 7});
18247 return DAG.getBitcast(VT, Ex);
18250 // Optimize shl/srl/sra with constant shift amount.
18251 if (auto *BVAmt = dyn_cast<BuildVectorSDNode>(Amt)) {
18252 if (auto *ShiftConst = BVAmt->getConstantSplatNode()) {
18253 uint64_t ShiftAmt = ShiftConst->getZExtValue();
18255 if (SupportedVectorShiftWithImm(VT, Subtarget, Op.getOpcode()))
18256 return getTargetVShiftByConstNode(X86Opc, dl, VT, R, ShiftAmt, DAG);
18258 // i64 SRA needs to be performed as partial shifts.
18259 if ((VT == MVT::v2i64 || (Subtarget->hasInt256() && VT == MVT::v4i64)) &&
18260 Op.getOpcode() == ISD::SRA && !Subtarget->hasXOP())
18261 return ArithmeticShiftRight64(ShiftAmt);
18263 if (VT == MVT::v16i8 || (Subtarget->hasInt256() && VT == MVT::v32i8)) {
18264 unsigned NumElts = VT.getVectorNumElements();
18265 MVT ShiftVT = MVT::getVectorVT(MVT::i16, NumElts / 2);
18267 // Simple i8 add case
18268 if (Op.getOpcode() == ISD::SHL && ShiftAmt == 1)
18269 return DAG.getNode(ISD::ADD, dl, VT, R, R);
18271 // ashr(R, 7) === cmp_slt(R, 0)
18272 if (Op.getOpcode() == ISD::SRA && ShiftAmt == 7) {
18273 SDValue Zeros = getZeroVector(VT, Subtarget, DAG, dl);
18274 return DAG.getNode(X86ISD::PCMPGT, dl, VT, Zeros, R);
18277 // XOP can shift v16i8 directly instead of as shift v8i16 + mask.
18278 if (VT == MVT::v16i8 && Subtarget->hasXOP())
18281 if (Op.getOpcode() == ISD::SHL) {
18282 // Make a large shift.
18283 SDValue SHL = getTargetVShiftByConstNode(X86ISD::VSHLI, dl, ShiftVT,
18285 SHL = DAG.getBitcast(VT, SHL);
18286 // Zero out the rightmost bits.
18287 SmallVector<SDValue, 32> V(
18288 NumElts, DAG.getConstant(uint8_t(-1U << ShiftAmt), dl, MVT::i8));
18289 return DAG.getNode(ISD::AND, dl, VT, SHL,
18290 DAG.getNode(ISD::BUILD_VECTOR, dl, VT, V));
18292 if (Op.getOpcode() == ISD::SRL) {
18293 // Make a large shift.
18294 SDValue SRL = getTargetVShiftByConstNode(X86ISD::VSRLI, dl, ShiftVT,
18296 SRL = DAG.getBitcast(VT, SRL);
18297 // Zero out the leftmost bits.
18298 SmallVector<SDValue, 32> V(
18299 NumElts, DAG.getConstant(uint8_t(-1U) >> ShiftAmt, dl, MVT::i8));
18300 return DAG.getNode(ISD::AND, dl, VT, SRL,
18301 DAG.getNode(ISD::BUILD_VECTOR, dl, VT, V));
18303 if (Op.getOpcode() == ISD::SRA) {
18304 // ashr(R, Amt) === sub(xor(lshr(R, Amt), Mask), Mask)
18305 SDValue Res = DAG.getNode(ISD::SRL, dl, VT, R, Amt);
18306 SmallVector<SDValue, 32> V(NumElts,
18307 DAG.getConstant(128 >> ShiftAmt, dl,
18309 SDValue Mask = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, V);
18310 Res = DAG.getNode(ISD::XOR, dl, VT, Res, Mask);
18311 Res = DAG.getNode(ISD::SUB, dl, VT, Res, Mask);
18314 llvm_unreachable("Unknown shift opcode.");
18319 // Special case in 32-bit mode, where i64 is expanded into high and low parts.
18320 if (!Subtarget->is64Bit() && !Subtarget->hasXOP() &&
18321 (VT == MVT::v2i64 || (Subtarget->hasInt256() && VT == MVT::v4i64))) {
18323 // Peek through any splat that was introduced for i64 shift vectorization.
18324 int SplatIndex = -1;
18325 if (ShuffleVectorSDNode *SVN = dyn_cast<ShuffleVectorSDNode>(Amt.getNode()))
18326 if (SVN->isSplat()) {
18327 SplatIndex = SVN->getSplatIndex();
18328 Amt = Amt.getOperand(0);
18329 assert(SplatIndex < (int)VT.getVectorNumElements() &&
18330 "Splat shuffle referencing second operand");
18333 if (Amt.getOpcode() != ISD::BITCAST ||
18334 Amt.getOperand(0).getOpcode() != ISD::BUILD_VECTOR)
18337 Amt = Amt.getOperand(0);
18338 unsigned Ratio = Amt.getSimpleValueType().getVectorNumElements() /
18339 VT.getVectorNumElements();
18340 unsigned RatioInLog2 = Log2_32_Ceil(Ratio);
18341 uint64_t ShiftAmt = 0;
18342 unsigned BaseOp = (SplatIndex < 0 ? 0 : SplatIndex * Ratio);
18343 for (unsigned i = 0; i != Ratio; ++i) {
18344 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Amt.getOperand(i + BaseOp));
18348 ShiftAmt |= C->getZExtValue() << (i * (1 << (6 - RatioInLog2)));
18351 // Check remaining shift amounts (if not a splat).
18352 if (SplatIndex < 0) {
18353 for (unsigned i = Ratio; i != Amt.getNumOperands(); i += Ratio) {
18354 uint64_t ShAmt = 0;
18355 for (unsigned j = 0; j != Ratio; ++j) {
18356 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Amt.getOperand(i + j));
18360 ShAmt |= C->getZExtValue() << (j * (1 << (6 - RatioInLog2)));
18362 if (ShAmt != ShiftAmt)
18367 if (SupportedVectorShiftWithImm(VT, Subtarget, Op.getOpcode()))
18368 return getTargetVShiftByConstNode(X86Opc, dl, VT, R, ShiftAmt, DAG);
18370 if (Op.getOpcode() == ISD::SRA)
18371 return ArithmeticShiftRight64(ShiftAmt);
18377 static SDValue LowerScalarVariableShift(SDValue Op, SelectionDAG &DAG,
18378 const X86Subtarget* Subtarget) {
18379 MVT VT = Op.getSimpleValueType();
18381 SDValue R = Op.getOperand(0);
18382 SDValue Amt = Op.getOperand(1);
18384 unsigned X86OpcI = (Op.getOpcode() == ISD::SHL) ? X86ISD::VSHLI :
18385 (Op.getOpcode() == ISD::SRL) ? X86ISD::VSRLI : X86ISD::VSRAI;
18387 unsigned X86OpcV = (Op.getOpcode() == ISD::SHL) ? X86ISD::VSHL :
18388 (Op.getOpcode() == ISD::SRL) ? X86ISD::VSRL : X86ISD::VSRA;
18390 if (SupportedVectorShiftWithBaseAmnt(VT, Subtarget, Op.getOpcode())) {
18392 MVT EltVT = VT.getVectorElementType();
18394 if (BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(Amt)) {
18395 // Check if this build_vector node is doing a splat.
18396 // If so, then set BaseShAmt equal to the splat value.
18397 BaseShAmt = BV->getSplatValue();
18398 if (BaseShAmt && BaseShAmt.getOpcode() == ISD::UNDEF)
18399 BaseShAmt = SDValue();
18401 if (Amt.getOpcode() == ISD::EXTRACT_SUBVECTOR)
18402 Amt = Amt.getOperand(0);
18404 ShuffleVectorSDNode *SVN = dyn_cast<ShuffleVectorSDNode>(Amt);
18405 if (SVN && SVN->isSplat()) {
18406 unsigned SplatIdx = (unsigned)SVN->getSplatIndex();
18407 SDValue InVec = Amt.getOperand(0);
18408 if (InVec.getOpcode() == ISD::BUILD_VECTOR) {
18409 assert((SplatIdx < InVec.getSimpleValueType().getVectorNumElements()) &&
18410 "Unexpected shuffle index found!");
18411 BaseShAmt = InVec.getOperand(SplatIdx);
18412 } else if (InVec.getOpcode() == ISD::INSERT_VECTOR_ELT) {
18413 if (ConstantSDNode *C =
18414 dyn_cast<ConstantSDNode>(InVec.getOperand(2))) {
18415 if (C->getZExtValue() == SplatIdx)
18416 BaseShAmt = InVec.getOperand(1);
18421 // Avoid introducing an extract element from a shuffle.
18422 BaseShAmt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT, InVec,
18423 DAG.getIntPtrConstant(SplatIdx, dl));
18427 if (BaseShAmt.getNode()) {
18428 assert(EltVT.bitsLE(MVT::i64) && "Unexpected element type!");
18429 if (EltVT != MVT::i64 && EltVT.bitsGT(MVT::i32))
18430 BaseShAmt = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i64, BaseShAmt);
18431 else if (EltVT.bitsLT(MVT::i32))
18432 BaseShAmt = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::i32, BaseShAmt);
18434 return getTargetVShiftNode(X86OpcI, dl, VT, R, BaseShAmt, DAG);
18438 // Special case in 32-bit mode, where i64 is expanded into high and low parts.
18439 if (!Subtarget->is64Bit() && VT == MVT::v2i64 &&
18440 Amt.getOpcode() == ISD::BITCAST &&
18441 Amt.getOperand(0).getOpcode() == ISD::BUILD_VECTOR) {
18442 Amt = Amt.getOperand(0);
18443 unsigned Ratio = Amt.getSimpleValueType().getVectorNumElements() /
18444 VT.getVectorNumElements();
18445 std::vector<SDValue> Vals(Ratio);
18446 for (unsigned i = 0; i != Ratio; ++i)
18447 Vals[i] = Amt.getOperand(i);
18448 for (unsigned i = Ratio; i != Amt.getNumOperands(); i += Ratio) {
18449 for (unsigned j = 0; j != Ratio; ++j)
18450 if (Vals[j] != Amt.getOperand(i + j))
18454 if (SupportedVectorShiftWithBaseAmnt(VT, Subtarget, Op.getOpcode()))
18455 return DAG.getNode(X86OpcV, dl, VT, R, Op.getOperand(1));
18460 static SDValue LowerShift(SDValue Op, const X86Subtarget* Subtarget,
18461 SelectionDAG &DAG) {
18462 MVT VT = Op.getSimpleValueType();
18464 SDValue R = Op.getOperand(0);
18465 SDValue Amt = Op.getOperand(1);
18467 assert(VT.isVector() && "Custom lowering only for vector shifts!");
18468 assert(Subtarget->hasSSE2() && "Only custom lower when we have SSE2!");
18470 if (SDValue V = LowerScalarImmediateShift(Op, DAG, Subtarget))
18473 if (SDValue V = LowerScalarVariableShift(Op, DAG, Subtarget))
18476 if (SupportedVectorVarShift(VT, Subtarget, Op.getOpcode()))
18479 // XOP has 128-bit variable logical/arithmetic shifts.
18480 // +ve/-ve Amt = shift left/right.
18481 if (Subtarget->hasXOP() &&
18482 (VT == MVT::v2i64 || VT == MVT::v4i32 ||
18483 VT == MVT::v8i16 || VT == MVT::v16i8)) {
18484 if (Op.getOpcode() == ISD::SRL || Op.getOpcode() == ISD::SRA) {
18485 SDValue Zero = getZeroVector(VT, Subtarget, DAG, dl);
18486 Amt = DAG.getNode(ISD::SUB, dl, VT, Zero, Amt);
18488 if (Op.getOpcode() == ISD::SHL || Op.getOpcode() == ISD::SRL)
18489 return DAG.getNode(X86ISD::VPSHL, dl, VT, R, Amt);
18490 if (Op.getOpcode() == ISD::SRA)
18491 return DAG.getNode(X86ISD::VPSHA, dl, VT, R, Amt);
18494 // 2i64 vector logical shifts can efficiently avoid scalarization - do the
18495 // shifts per-lane and then shuffle the partial results back together.
18496 if (VT == MVT::v2i64 && Op.getOpcode() != ISD::SRA) {
18497 // Splat the shift amounts so the scalar shifts above will catch it.
18498 SDValue Amt0 = DAG.getVectorShuffle(VT, dl, Amt, Amt, {0, 0});
18499 SDValue Amt1 = DAG.getVectorShuffle(VT, dl, Amt, Amt, {1, 1});
18500 SDValue R0 = DAG.getNode(Op->getOpcode(), dl, VT, R, Amt0);
18501 SDValue R1 = DAG.getNode(Op->getOpcode(), dl, VT, R, Amt1);
18502 return DAG.getVectorShuffle(VT, dl, R0, R1, {0, 3});
18505 // i64 vector arithmetic shift can be emulated with the transform:
18506 // M = lshr(SIGN_BIT, Amt)
18507 // ashr(R, Amt) === sub(xor(lshr(R, Amt), M), M)
18508 if ((VT == MVT::v2i64 || (VT == MVT::v4i64 && Subtarget->hasInt256())) &&
18509 Op.getOpcode() == ISD::SRA) {
18510 SDValue S = DAG.getConstant(APInt::getSignBit(64), dl, VT);
18511 SDValue M = DAG.getNode(ISD::SRL, dl, VT, S, Amt);
18512 R = DAG.getNode(ISD::SRL, dl, VT, R, Amt);
18513 R = DAG.getNode(ISD::XOR, dl, VT, R, M);
18514 R = DAG.getNode(ISD::SUB, dl, VT, R, M);
18518 // If possible, lower this packed shift into a vector multiply instead of
18519 // expanding it into a sequence of scalar shifts.
18520 // Do this only if the vector shift count is a constant build_vector.
18521 if (Op.getOpcode() == ISD::SHL &&
18522 (VT == MVT::v8i16 || VT == MVT::v4i32 ||
18523 (Subtarget->hasInt256() && VT == MVT::v16i16)) &&
18524 ISD::isBuildVectorOfConstantSDNodes(Amt.getNode())) {
18525 SmallVector<SDValue, 8> Elts;
18526 MVT SVT = VT.getVectorElementType();
18527 unsigned SVTBits = SVT.getSizeInBits();
18528 APInt One(SVTBits, 1);
18529 unsigned NumElems = VT.getVectorNumElements();
18531 for (unsigned i=0; i !=NumElems; ++i) {
18532 SDValue Op = Amt->getOperand(i);
18533 if (Op->getOpcode() == ISD::UNDEF) {
18534 Elts.push_back(Op);
18538 ConstantSDNode *ND = cast<ConstantSDNode>(Op);
18539 APInt C(SVTBits, ND->getAPIntValue().getZExtValue());
18540 uint64_t ShAmt = C.getZExtValue();
18541 if (ShAmt >= SVTBits) {
18542 Elts.push_back(DAG.getUNDEF(SVT));
18545 Elts.push_back(DAG.getConstant(One.shl(ShAmt), dl, SVT));
18547 SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Elts);
18548 return DAG.getNode(ISD::MUL, dl, VT, R, BV);
18551 // Lower SHL with variable shift amount.
18552 if (VT == MVT::v4i32 && Op->getOpcode() == ISD::SHL) {
18553 Op = DAG.getNode(ISD::SHL, dl, VT, Amt, DAG.getConstant(23, dl, VT));
18555 Op = DAG.getNode(ISD::ADD, dl, VT, Op,
18556 DAG.getConstant(0x3f800000U, dl, VT));
18557 Op = DAG.getBitcast(MVT::v4f32, Op);
18558 Op = DAG.getNode(ISD::FP_TO_SINT, dl, VT, Op);
18559 return DAG.getNode(ISD::MUL, dl, VT, Op, R);
18562 // If possible, lower this shift as a sequence of two shifts by
18563 // constant plus a MOVSS/MOVSD instead of scalarizing it.
18565 // (v4i32 (srl A, (build_vector < X, Y, Y, Y>)))
18567 // Could be rewritten as:
18568 // (v4i32 (MOVSS (srl A, <Y,Y,Y,Y>), (srl A, <X,X,X,X>)))
18570 // The advantage is that the two shifts from the example would be
18571 // lowered as X86ISD::VSRLI nodes. This would be cheaper than scalarizing
18572 // the vector shift into four scalar shifts plus four pairs of vector
18574 if ((VT == MVT::v8i16 || VT == MVT::v4i32) &&
18575 ISD::isBuildVectorOfConstantSDNodes(Amt.getNode())) {
18576 unsigned TargetOpcode = X86ISD::MOVSS;
18577 bool CanBeSimplified;
18578 // The splat value for the first packed shift (the 'X' from the example).
18579 SDValue Amt1 = Amt->getOperand(0);
18580 // The splat value for the second packed shift (the 'Y' from the example).
18581 SDValue Amt2 = (VT == MVT::v4i32) ? Amt->getOperand(1) :
18582 Amt->getOperand(2);
18584 // See if it is possible to replace this node with a sequence of
18585 // two shifts followed by a MOVSS/MOVSD
18586 if (VT == MVT::v4i32) {
18587 // Check if it is legal to use a MOVSS.
18588 CanBeSimplified = Amt2 == Amt->getOperand(2) &&
18589 Amt2 == Amt->getOperand(3);
18590 if (!CanBeSimplified) {
18591 // Otherwise, check if we can still simplify this node using a MOVSD.
18592 CanBeSimplified = Amt1 == Amt->getOperand(1) &&
18593 Amt->getOperand(2) == Amt->getOperand(3);
18594 TargetOpcode = X86ISD::MOVSD;
18595 Amt2 = Amt->getOperand(2);
18598 // Do similar checks for the case where the machine value type
18600 CanBeSimplified = Amt1 == Amt->getOperand(1);
18601 for (unsigned i=3; i != 8 && CanBeSimplified; ++i)
18602 CanBeSimplified = Amt2 == Amt->getOperand(i);
18604 if (!CanBeSimplified) {
18605 TargetOpcode = X86ISD::MOVSD;
18606 CanBeSimplified = true;
18607 Amt2 = Amt->getOperand(4);
18608 for (unsigned i=0; i != 4 && CanBeSimplified; ++i)
18609 CanBeSimplified = Amt1 == Amt->getOperand(i);
18610 for (unsigned j=4; j != 8 && CanBeSimplified; ++j)
18611 CanBeSimplified = Amt2 == Amt->getOperand(j);
18615 if (CanBeSimplified && isa<ConstantSDNode>(Amt1) &&
18616 isa<ConstantSDNode>(Amt2)) {
18617 // Replace this node with two shifts followed by a MOVSS/MOVSD.
18618 MVT CastVT = MVT::v4i32;
18620 DAG.getConstant(cast<ConstantSDNode>(Amt1)->getAPIntValue(), dl, VT);
18621 SDValue Shift1 = DAG.getNode(Op->getOpcode(), dl, VT, R, Splat1);
18623 DAG.getConstant(cast<ConstantSDNode>(Amt2)->getAPIntValue(), dl, VT);
18624 SDValue Shift2 = DAG.getNode(Op->getOpcode(), dl, VT, R, Splat2);
18625 if (TargetOpcode == X86ISD::MOVSD)
18626 CastVT = MVT::v2i64;
18627 SDValue BitCast1 = DAG.getBitcast(CastVT, Shift1);
18628 SDValue BitCast2 = DAG.getBitcast(CastVT, Shift2);
18629 SDValue Result = getTargetShuffleNode(TargetOpcode, dl, CastVT, BitCast2,
18631 return DAG.getBitcast(VT, Result);
18635 // v4i32 Non Uniform Shifts.
18636 // If the shift amount is constant we can shift each lane using the SSE2
18637 // immediate shifts, else we need to zero-extend each lane to the lower i64
18638 // and shift using the SSE2 variable shifts.
18639 // The separate results can then be blended together.
18640 if (VT == MVT::v4i32) {
18641 unsigned Opc = Op.getOpcode();
18642 SDValue Amt0, Amt1, Amt2, Amt3;
18643 if (ISD::isBuildVectorOfConstantSDNodes(Amt.getNode())) {
18644 Amt0 = DAG.getVectorShuffle(VT, dl, Amt, DAG.getUNDEF(VT), {0, 0, 0, 0});
18645 Amt1 = DAG.getVectorShuffle(VT, dl, Amt, DAG.getUNDEF(VT), {1, 1, 1, 1});
18646 Amt2 = DAG.getVectorShuffle(VT, dl, Amt, DAG.getUNDEF(VT), {2, 2, 2, 2});
18647 Amt3 = DAG.getVectorShuffle(VT, dl, Amt, DAG.getUNDEF(VT), {3, 3, 3, 3});
18649 // ISD::SHL is handled above but we include it here for completeness.
18652 llvm_unreachable("Unknown target vector shift node");
18654 Opc = X86ISD::VSHL;
18657 Opc = X86ISD::VSRL;
18660 Opc = X86ISD::VSRA;
18663 // The SSE2 shifts use the lower i64 as the same shift amount for
18664 // all lanes and the upper i64 is ignored. These shuffle masks
18665 // optimally zero-extend each lanes on SSE2/SSE41/AVX targets.
18666 SDValue Z = getZeroVector(VT, Subtarget, DAG, dl);
18667 Amt0 = DAG.getVectorShuffle(VT, dl, Amt, Z, {0, 4, -1, -1});
18668 Amt1 = DAG.getVectorShuffle(VT, dl, Amt, Z, {1, 5, -1, -1});
18669 Amt2 = DAG.getVectorShuffle(VT, dl, Amt, Z, {2, 6, -1, -1});
18670 Amt3 = DAG.getVectorShuffle(VT, dl, Amt, Z, {3, 7, -1, -1});
18673 SDValue R0 = DAG.getNode(Opc, dl, VT, R, Amt0);
18674 SDValue R1 = DAG.getNode(Opc, dl, VT, R, Amt1);
18675 SDValue R2 = DAG.getNode(Opc, dl, VT, R, Amt2);
18676 SDValue R3 = DAG.getNode(Opc, dl, VT, R, Amt3);
18677 SDValue R02 = DAG.getVectorShuffle(VT, dl, R0, R2, {0, -1, 6, -1});
18678 SDValue R13 = DAG.getVectorShuffle(VT, dl, R1, R3, {-1, 1, -1, 7});
18679 return DAG.getVectorShuffle(VT, dl, R02, R13, {0, 5, 2, 7});
18682 if (VT == MVT::v16i8 ||
18683 (VT == MVT::v32i8 && Subtarget->hasInt256() && !Subtarget->hasXOP())) {
18684 MVT ExtVT = MVT::getVectorVT(MVT::i16, VT.getVectorNumElements() / 2);
18685 unsigned ShiftOpcode = Op->getOpcode();
18687 auto SignBitSelect = [&](MVT SelVT, SDValue Sel, SDValue V0, SDValue V1) {
18688 // On SSE41 targets we make use of the fact that VSELECT lowers
18689 // to PBLENDVB which selects bytes based just on the sign bit.
18690 if (Subtarget->hasSSE41()) {
18691 V0 = DAG.getBitcast(VT, V0);
18692 V1 = DAG.getBitcast(VT, V1);
18693 Sel = DAG.getBitcast(VT, Sel);
18694 return DAG.getBitcast(SelVT,
18695 DAG.getNode(ISD::VSELECT, dl, VT, Sel, V0, V1));
18697 // On pre-SSE41 targets we test for the sign bit by comparing to
18698 // zero - a negative value will set all bits of the lanes to true
18699 // and VSELECT uses that in its OR(AND(V0,C),AND(V1,~C)) lowering.
18700 SDValue Z = getZeroVector(SelVT, Subtarget, DAG, dl);
18701 SDValue C = DAG.getNode(X86ISD::PCMPGT, dl, SelVT, Z, Sel);
18702 return DAG.getNode(ISD::VSELECT, dl, SelVT, C, V0, V1);
18705 // Turn 'a' into a mask suitable for VSELECT: a = a << 5;
18706 // We can safely do this using i16 shifts as we're only interested in
18707 // the 3 lower bits of each byte.
18708 Amt = DAG.getBitcast(ExtVT, Amt);
18709 Amt = DAG.getNode(ISD::SHL, dl, ExtVT, Amt, DAG.getConstant(5, dl, ExtVT));
18710 Amt = DAG.getBitcast(VT, Amt);
18712 if (Op->getOpcode() == ISD::SHL || Op->getOpcode() == ISD::SRL) {
18713 // r = VSELECT(r, shift(r, 4), a);
18715 DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(4, dl, VT));
18716 R = SignBitSelect(VT, Amt, M, R);
18719 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18721 // r = VSELECT(r, shift(r, 2), a);
18722 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(2, dl, VT));
18723 R = SignBitSelect(VT, Amt, M, R);
18726 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18728 // return VSELECT(r, shift(r, 1), a);
18729 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(1, dl, VT));
18730 R = SignBitSelect(VT, Amt, M, R);
18734 if (Op->getOpcode() == ISD::SRA) {
18735 // For SRA we need to unpack each byte to the higher byte of a i16 vector
18736 // so we can correctly sign extend. We don't care what happens to the
18738 SDValue ALo = DAG.getNode(X86ISD::UNPCKL, dl, VT, DAG.getUNDEF(VT), Amt);
18739 SDValue AHi = DAG.getNode(X86ISD::UNPCKH, dl, VT, DAG.getUNDEF(VT), Amt);
18740 SDValue RLo = DAG.getNode(X86ISD::UNPCKL, dl, VT, DAG.getUNDEF(VT), R);
18741 SDValue RHi = DAG.getNode(X86ISD::UNPCKH, dl, VT, DAG.getUNDEF(VT), R);
18742 ALo = DAG.getBitcast(ExtVT, ALo);
18743 AHi = DAG.getBitcast(ExtVT, AHi);
18744 RLo = DAG.getBitcast(ExtVT, RLo);
18745 RHi = DAG.getBitcast(ExtVT, RHi);
18747 // r = VSELECT(r, shift(r, 4), a);
18748 SDValue MLo = DAG.getNode(ShiftOpcode, dl, ExtVT, RLo,
18749 DAG.getConstant(4, dl, ExtVT));
18750 SDValue MHi = DAG.getNode(ShiftOpcode, dl, ExtVT, RHi,
18751 DAG.getConstant(4, dl, ExtVT));
18752 RLo = SignBitSelect(ExtVT, ALo, MLo, RLo);
18753 RHi = SignBitSelect(ExtVT, AHi, MHi, RHi);
18756 ALo = DAG.getNode(ISD::ADD, dl, ExtVT, ALo, ALo);
18757 AHi = DAG.getNode(ISD::ADD, dl, ExtVT, AHi, AHi);
18759 // r = VSELECT(r, shift(r, 2), a);
18760 MLo = DAG.getNode(ShiftOpcode, dl, ExtVT, RLo,
18761 DAG.getConstant(2, dl, ExtVT));
18762 MHi = DAG.getNode(ShiftOpcode, dl, ExtVT, RHi,
18763 DAG.getConstant(2, dl, ExtVT));
18764 RLo = SignBitSelect(ExtVT, ALo, MLo, RLo);
18765 RHi = SignBitSelect(ExtVT, AHi, MHi, RHi);
18768 ALo = DAG.getNode(ISD::ADD, dl, ExtVT, ALo, ALo);
18769 AHi = DAG.getNode(ISD::ADD, dl, ExtVT, AHi, AHi);
18771 // r = VSELECT(r, shift(r, 1), a);
18772 MLo = DAG.getNode(ShiftOpcode, dl, ExtVT, RLo,
18773 DAG.getConstant(1, dl, ExtVT));
18774 MHi = DAG.getNode(ShiftOpcode, dl, ExtVT, RHi,
18775 DAG.getConstant(1, dl, ExtVT));
18776 RLo = SignBitSelect(ExtVT, ALo, MLo, RLo);
18777 RHi = SignBitSelect(ExtVT, AHi, MHi, RHi);
18779 // Logical shift the result back to the lower byte, leaving a zero upper
18781 // meaning that we can safely pack with PACKUSWB.
18783 DAG.getNode(ISD::SRL, dl, ExtVT, RLo, DAG.getConstant(8, dl, ExtVT));
18785 DAG.getNode(ISD::SRL, dl, ExtVT, RHi, DAG.getConstant(8, dl, ExtVT));
18786 return DAG.getNode(X86ISD::PACKUS, dl, VT, RLo, RHi);
18790 // It's worth extending once and using the v8i32 shifts for 16-bit types, but
18791 // the extra overheads to get from v16i8 to v8i32 make the existing SSE
18792 // solution better.
18793 if (Subtarget->hasInt256() && VT == MVT::v8i16) {
18794 MVT ExtVT = MVT::v8i32;
18796 Op.getOpcode() == ISD::SRA ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
18797 R = DAG.getNode(ExtOpc, dl, ExtVT, R);
18798 Amt = DAG.getNode(ISD::ANY_EXTEND, dl, ExtVT, Amt);
18799 return DAG.getNode(ISD::TRUNCATE, dl, VT,
18800 DAG.getNode(Op.getOpcode(), dl, ExtVT, R, Amt));
18803 if (Subtarget->hasInt256() && !Subtarget->hasXOP() && VT == MVT::v16i16) {
18804 MVT ExtVT = MVT::v8i32;
18805 SDValue Z = getZeroVector(VT, Subtarget, DAG, dl);
18806 SDValue ALo = DAG.getNode(X86ISD::UNPCKL, dl, VT, Amt, Z);
18807 SDValue AHi = DAG.getNode(X86ISD::UNPCKH, dl, VT, Amt, Z);
18808 SDValue RLo = DAG.getNode(X86ISD::UNPCKL, dl, VT, R, R);
18809 SDValue RHi = DAG.getNode(X86ISD::UNPCKH, dl, VT, R, R);
18810 ALo = DAG.getBitcast(ExtVT, ALo);
18811 AHi = DAG.getBitcast(ExtVT, AHi);
18812 RLo = DAG.getBitcast(ExtVT, RLo);
18813 RHi = DAG.getBitcast(ExtVT, RHi);
18814 SDValue Lo = DAG.getNode(Op.getOpcode(), dl, ExtVT, RLo, ALo);
18815 SDValue Hi = DAG.getNode(Op.getOpcode(), dl, ExtVT, RHi, AHi);
18816 Lo = DAG.getNode(ISD::SRL, dl, ExtVT, Lo, DAG.getConstant(16, dl, ExtVT));
18817 Hi = DAG.getNode(ISD::SRL, dl, ExtVT, Hi, DAG.getConstant(16, dl, ExtVT));
18818 return DAG.getNode(X86ISD::PACKUS, dl, VT, Lo, Hi);
18821 if (VT == MVT::v8i16) {
18822 unsigned ShiftOpcode = Op->getOpcode();
18824 auto SignBitSelect = [&](SDValue Sel, SDValue V0, SDValue V1) {
18825 // On SSE41 targets we make use of the fact that VSELECT lowers
18826 // to PBLENDVB which selects bytes based just on the sign bit.
18827 if (Subtarget->hasSSE41()) {
18828 MVT ExtVT = MVT::getVectorVT(MVT::i8, VT.getVectorNumElements() * 2);
18829 V0 = DAG.getBitcast(ExtVT, V0);
18830 V1 = DAG.getBitcast(ExtVT, V1);
18831 Sel = DAG.getBitcast(ExtVT, Sel);
18832 return DAG.getBitcast(
18833 VT, DAG.getNode(ISD::VSELECT, dl, ExtVT, Sel, V0, V1));
18835 // On pre-SSE41 targets we splat the sign bit - a negative value will
18836 // set all bits of the lanes to true and VSELECT uses that in
18837 // its OR(AND(V0,C),AND(V1,~C)) lowering.
18839 DAG.getNode(ISD::SRA, dl, VT, Sel, DAG.getConstant(15, dl, VT));
18840 return DAG.getNode(ISD::VSELECT, dl, VT, C, V0, V1);
18843 // Turn 'a' into a mask suitable for VSELECT: a = a << 12;
18844 if (Subtarget->hasSSE41()) {
18845 // On SSE41 targets we need to replicate the shift mask in both
18846 // bytes for PBLENDVB.
18849 DAG.getNode(ISD::SHL, dl, VT, Amt, DAG.getConstant(4, dl, VT)),
18850 DAG.getNode(ISD::SHL, dl, VT, Amt, DAG.getConstant(12, dl, VT)));
18852 Amt = DAG.getNode(ISD::SHL, dl, VT, Amt, DAG.getConstant(12, dl, VT));
18855 // r = VSELECT(r, shift(r, 8), a);
18856 SDValue M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(8, dl, VT));
18857 R = SignBitSelect(Amt, M, R);
18860 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18862 // r = VSELECT(r, shift(r, 4), a);
18863 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(4, dl, VT));
18864 R = SignBitSelect(Amt, M, R);
18867 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18869 // r = VSELECT(r, shift(r, 2), a);
18870 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(2, dl, VT));
18871 R = SignBitSelect(Amt, M, R);
18874 Amt = DAG.getNode(ISD::ADD, dl, VT, Amt, Amt);
18876 // return VSELECT(r, shift(r, 1), a);
18877 M = DAG.getNode(ShiftOpcode, dl, VT, R, DAG.getConstant(1, dl, VT));
18878 R = SignBitSelect(Amt, M, R);
18882 // Decompose 256-bit shifts into smaller 128-bit shifts.
18883 if (VT.is256BitVector()) {
18884 unsigned NumElems = VT.getVectorNumElements();
18885 MVT EltVT = VT.getVectorElementType();
18886 MVT NewVT = MVT::getVectorVT(EltVT, NumElems/2);
18888 // Extract the two vectors
18889 SDValue V1 = Extract128BitVector(R, 0, DAG, dl);
18890 SDValue V2 = Extract128BitVector(R, NumElems/2, DAG, dl);
18892 // Recreate the shift amount vectors
18893 SDValue Amt1, Amt2;
18894 if (Amt.getOpcode() == ISD::BUILD_VECTOR) {
18895 // Constant shift amount
18896 SmallVector<SDValue, 8> Ops(Amt->op_begin(), Amt->op_begin() + NumElems);
18897 ArrayRef<SDValue> Amt1Csts = makeArrayRef(Ops).slice(0, NumElems / 2);
18898 ArrayRef<SDValue> Amt2Csts = makeArrayRef(Ops).slice(NumElems / 2);
18900 Amt1 = DAG.getNode(ISD::BUILD_VECTOR, dl, NewVT, Amt1Csts);
18901 Amt2 = DAG.getNode(ISD::BUILD_VECTOR, dl, NewVT, Amt2Csts);
18903 // Variable shift amount
18904 Amt1 = Extract128BitVector(Amt, 0, DAG, dl);
18905 Amt2 = Extract128BitVector(Amt, NumElems/2, DAG, dl);
18908 // Issue new vector shifts for the smaller types
18909 V1 = DAG.getNode(Op.getOpcode(), dl, NewVT, V1, Amt1);
18910 V2 = DAG.getNode(Op.getOpcode(), dl, NewVT, V2, Amt2);
18912 // Concatenate the result back
18913 return DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, V1, V2);
18919 static SDValue LowerRotate(SDValue Op, const X86Subtarget *Subtarget,
18920 SelectionDAG &DAG) {
18921 MVT VT = Op.getSimpleValueType();
18923 SDValue R = Op.getOperand(0);
18924 SDValue Amt = Op.getOperand(1);
18926 assert(VT.isVector() && "Custom lowering only for vector rotates!");
18927 assert(Subtarget->hasXOP() && "XOP support required for vector rotates!");
18928 assert((Op.getOpcode() == ISD::ROTL) && "Only ROTL supported");
18930 // XOP has 128-bit vector variable + immediate rotates.
18931 // +ve/-ve Amt = rotate left/right.
18933 // Split 256-bit integers.
18934 if (VT.is256BitVector())
18935 return Lower256IntArith(Op, DAG);
18937 assert(VT.is128BitVector() && "Only rotate 128-bit vectors!");
18939 // Attempt to rotate by immediate.
18940 if (auto *BVAmt = dyn_cast<BuildVectorSDNode>(Amt)) {
18941 if (auto *RotateConst = BVAmt->getConstantSplatNode()) {
18942 uint64_t RotateAmt = RotateConst->getAPIntValue().getZExtValue();
18943 assert(RotateAmt < VT.getScalarSizeInBits() && "Rotation out of range");
18944 return DAG.getNode(X86ISD::VPROTI, DL, VT, R,
18945 DAG.getConstant(RotateAmt, DL, MVT::i8));
18949 // Use general rotate by variable (per-element).
18950 return DAG.getNode(X86ISD::VPROT, DL, VT, R, Amt);
18953 static SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) {
18954 // Lower the "add/sub/mul with overflow" instruction into a regular ins plus
18955 // a "setcc" instruction that checks the overflow flag. The "brcond" lowering
18956 // looks for this combo and may remove the "setcc" instruction if the "setcc"
18957 // has only one use.
18958 SDNode *N = Op.getNode();
18959 SDValue LHS = N->getOperand(0);
18960 SDValue RHS = N->getOperand(1);
18961 unsigned BaseOp = 0;
18964 switch (Op.getOpcode()) {
18965 default: llvm_unreachable("Unknown ovf instruction!");
18967 // A subtract of one will be selected as a INC. Note that INC doesn't
18968 // set CF, so we can't do this for UADDO.
18969 if (isOneConstant(RHS)) {
18970 BaseOp = X86ISD::INC;
18971 Cond = X86::COND_O;
18974 BaseOp = X86ISD::ADD;
18975 Cond = X86::COND_O;
18978 BaseOp = X86ISD::ADD;
18979 Cond = X86::COND_B;
18982 // A subtract of one will be selected as a DEC. Note that DEC doesn't
18983 // set CF, so we can't do this for USUBO.
18984 if (isOneConstant(RHS)) {
18985 BaseOp = X86ISD::DEC;
18986 Cond = X86::COND_O;
18989 BaseOp = X86ISD::SUB;
18990 Cond = X86::COND_O;
18993 BaseOp = X86ISD::SUB;
18994 Cond = X86::COND_B;
18997 BaseOp = N->getValueType(0) == MVT::i8 ? X86ISD::SMUL8 : X86ISD::SMUL;
18998 Cond = X86::COND_O;
19000 case ISD::UMULO: { // i64, i8 = umulo lhs, rhs --> i64, i64, i32 umul lhs,rhs
19001 if (N->getValueType(0) == MVT::i8) {
19002 BaseOp = X86ISD::UMUL8;
19003 Cond = X86::COND_O;
19006 SDVTList VTs = DAG.getVTList(N->getValueType(0), N->getValueType(0),
19008 SDValue Sum = DAG.getNode(X86ISD::UMUL, DL, VTs, LHS, RHS);
19011 DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
19012 DAG.getConstant(X86::COND_O, DL, MVT::i32),
19013 SDValue(Sum.getNode(), 2));
19015 return DAG.getNode(ISD::MERGE_VALUES, DL, N->getVTList(), Sum, SetCC);
19019 // Also sets EFLAGS.
19020 SDVTList VTs = DAG.getVTList(N->getValueType(0), MVT::i32);
19021 SDValue Sum = DAG.getNode(BaseOp, DL, VTs, LHS, RHS);
19024 DAG.getNode(X86ISD::SETCC, DL, N->getValueType(1),
19025 DAG.getConstant(Cond, DL, MVT::i32),
19026 SDValue(Sum.getNode(), 1));
19028 return DAG.getNode(ISD::MERGE_VALUES, DL, N->getVTList(), Sum, SetCC);
19031 /// Returns true if the operand type is exactly twice the native width, and
19032 /// the corresponding cmpxchg8b or cmpxchg16b instruction is available.
19033 /// Used to know whether to use cmpxchg8/16b when expanding atomic operations
19034 /// (otherwise we leave them alone to become __sync_fetch_and_... calls).
19035 bool X86TargetLowering::needsCmpXchgNb(Type *MemType) const {
19036 unsigned OpWidth = MemType->getPrimitiveSizeInBits();
19039 return !Subtarget->is64Bit(); // FIXME this should be Subtarget.hasCmpxchg8b
19040 else if (OpWidth == 128)
19041 return Subtarget->hasCmpxchg16b();
19046 bool X86TargetLowering::shouldExpandAtomicStoreInIR(StoreInst *SI) const {
19047 return needsCmpXchgNb(SI->getValueOperand()->getType());
19050 // Note: this turns large loads into lock cmpxchg8b/16b.
19051 // FIXME: On 32 bits x86, fild/movq might be faster than lock cmpxchg8b.
19052 TargetLowering::AtomicExpansionKind
19053 X86TargetLowering::shouldExpandAtomicLoadInIR(LoadInst *LI) const {
19054 auto PTy = cast<PointerType>(LI->getPointerOperand()->getType());
19055 return needsCmpXchgNb(PTy->getElementType()) ? AtomicExpansionKind::CmpXChg
19056 : AtomicExpansionKind::None;
19059 TargetLowering::AtomicExpansionKind
19060 X86TargetLowering::shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const {
19061 unsigned NativeWidth = Subtarget->is64Bit() ? 64 : 32;
19062 Type *MemType = AI->getType();
19064 // If the operand is too big, we must see if cmpxchg8/16b is available
19065 // and default to library calls otherwise.
19066 if (MemType->getPrimitiveSizeInBits() > NativeWidth) {
19067 return needsCmpXchgNb(MemType) ? AtomicExpansionKind::CmpXChg
19068 : AtomicExpansionKind::None;
19071 AtomicRMWInst::BinOp Op = AI->getOperation();
19074 llvm_unreachable("Unknown atomic operation");
19075 case AtomicRMWInst::Xchg:
19076 case AtomicRMWInst::Add:
19077 case AtomicRMWInst::Sub:
19078 // It's better to use xadd, xsub or xchg for these in all cases.
19079 return AtomicExpansionKind::None;
19080 case AtomicRMWInst::Or:
19081 case AtomicRMWInst::And:
19082 case AtomicRMWInst::Xor:
19083 // If the atomicrmw's result isn't actually used, we can just add a "lock"
19084 // prefix to a normal instruction for these operations.
19085 return !AI->use_empty() ? AtomicExpansionKind::CmpXChg
19086 : AtomicExpansionKind::None;
19087 case AtomicRMWInst::Nand:
19088 case AtomicRMWInst::Max:
19089 case AtomicRMWInst::Min:
19090 case AtomicRMWInst::UMax:
19091 case AtomicRMWInst::UMin:
19092 // These always require a non-trivial set of data operations on x86. We must
19093 // use a cmpxchg loop.
19094 return AtomicExpansionKind::CmpXChg;
19098 static bool hasMFENCE(const X86Subtarget& Subtarget) {
19099 // Use mfence if we have SSE2 or we're on x86-64 (even if we asked for
19100 // no-sse2). There isn't any reason to disable it if the target processor
19102 return Subtarget.hasSSE2() || Subtarget.is64Bit();
19106 X86TargetLowering::lowerIdempotentRMWIntoFencedLoad(AtomicRMWInst *AI) const {
19107 unsigned NativeWidth = Subtarget->is64Bit() ? 64 : 32;
19108 Type *MemType = AI->getType();
19109 // Accesses larger than the native width are turned into cmpxchg/libcalls, so
19110 // there is no benefit in turning such RMWs into loads, and it is actually
19111 // harmful as it introduces a mfence.
19112 if (MemType->getPrimitiveSizeInBits() > NativeWidth)
19115 auto Builder = IRBuilder<>(AI);
19116 Module *M = Builder.GetInsertBlock()->getParent()->getParent();
19117 auto SynchScope = AI->getSynchScope();
19118 // We must restrict the ordering to avoid generating loads with Release or
19119 // ReleaseAcquire orderings.
19120 auto Order = AtomicCmpXchgInst::getStrongestFailureOrdering(AI->getOrdering());
19121 auto Ptr = AI->getPointerOperand();
19123 // Before the load we need a fence. Here is an example lifted from
19124 // http://www.hpl.hp.com/techreports/2012/HPL-2012-68.pdf showing why a fence
19127 // x.store(1, relaxed);
19128 // r1 = y.fetch_add(0, release);
19130 // y.fetch_add(42, acquire);
19131 // r2 = x.load(relaxed);
19132 // r1 = r2 = 0 is impossible, but becomes possible if the idempotent rmw is
19133 // lowered to just a load without a fence. A mfence flushes the store buffer,
19134 // making the optimization clearly correct.
19135 // FIXME: it is required if isAtLeastRelease(Order) but it is not clear
19136 // otherwise, we might be able to be more aggressive on relaxed idempotent
19137 // rmw. In practice, they do not look useful, so we don't try to be
19138 // especially clever.
19139 if (SynchScope == SingleThread)
19140 // FIXME: we could just insert an X86ISD::MEMBARRIER here, except we are at
19141 // the IR level, so we must wrap it in an intrinsic.
19144 if (!hasMFENCE(*Subtarget))
19145 // FIXME: it might make sense to use a locked operation here but on a
19146 // different cache-line to prevent cache-line bouncing. In practice it
19147 // is probably a small win, and x86 processors without mfence are rare
19148 // enough that we do not bother.
19152 llvm::Intrinsic::getDeclaration(M, Intrinsic::x86_sse2_mfence);
19153 Builder.CreateCall(MFence, {});
19155 // Finally we can emit the atomic load.
19156 LoadInst *Loaded = Builder.CreateAlignedLoad(Ptr,
19157 AI->getType()->getPrimitiveSizeInBits());
19158 Loaded->setAtomic(Order, SynchScope);
19159 AI->replaceAllUsesWith(Loaded);
19160 AI->eraseFromParent();
19164 static SDValue LowerATOMIC_FENCE(SDValue Op, const X86Subtarget *Subtarget,
19165 SelectionDAG &DAG) {
19167 AtomicOrdering FenceOrdering = static_cast<AtomicOrdering>(
19168 cast<ConstantSDNode>(Op.getOperand(1))->getZExtValue());
19169 SynchronizationScope FenceScope = static_cast<SynchronizationScope>(
19170 cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue());
19172 // The only fence that needs an instruction is a sequentially-consistent
19173 // cross-thread fence.
19174 if (FenceOrdering == SequentiallyConsistent && FenceScope == CrossThread) {
19175 if (hasMFENCE(*Subtarget))
19176 return DAG.getNode(X86ISD::MFENCE, dl, MVT::Other, Op.getOperand(0));
19178 SDValue Chain = Op.getOperand(0);
19179 SDValue Zero = DAG.getConstant(0, dl, MVT::i32);
19181 DAG.getRegister(X86::ESP, MVT::i32), // Base
19182 DAG.getTargetConstant(1, dl, MVT::i8), // Scale
19183 DAG.getRegister(0, MVT::i32), // Index
19184 DAG.getTargetConstant(0, dl, MVT::i32), // Disp
19185 DAG.getRegister(0, MVT::i32), // Segment.
19189 SDNode *Res = DAG.getMachineNode(X86::OR32mrLocked, dl, MVT::Other, Ops);
19190 return SDValue(Res, 0);
19193 // MEMBARRIER is a compiler barrier; it codegens to a no-op.
19194 return DAG.getNode(X86ISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0));
19197 static SDValue LowerCMP_SWAP(SDValue Op, const X86Subtarget *Subtarget,
19198 SelectionDAG &DAG) {
19199 MVT T = Op.getSimpleValueType();
19203 switch(T.SimpleTy) {
19204 default: llvm_unreachable("Invalid value type!");
19205 case MVT::i8: Reg = X86::AL; size = 1; break;
19206 case MVT::i16: Reg = X86::AX; size = 2; break;
19207 case MVT::i32: Reg = X86::EAX; size = 4; break;
19209 assert(Subtarget->is64Bit() && "Node not type legal!");
19210 Reg = X86::RAX; size = 8;
19213 SDValue cpIn = DAG.getCopyToReg(Op.getOperand(0), DL, Reg,
19214 Op.getOperand(2), SDValue());
19215 SDValue Ops[] = { cpIn.getValue(0),
19218 DAG.getTargetConstant(size, DL, MVT::i8),
19219 cpIn.getValue(1) };
19220 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
19221 MachineMemOperand *MMO = cast<AtomicSDNode>(Op)->getMemOperand();
19222 SDValue Result = DAG.getMemIntrinsicNode(X86ISD::LCMPXCHG_DAG, DL, Tys,
19226 DAG.getCopyFromReg(Result.getValue(0), DL, Reg, T, Result.getValue(1));
19227 SDValue EFLAGS = DAG.getCopyFromReg(cpOut.getValue(1), DL, X86::EFLAGS,
19228 MVT::i32, cpOut.getValue(2));
19229 SDValue Success = DAG.getNode(X86ISD::SETCC, DL, Op->getValueType(1),
19230 DAG.getConstant(X86::COND_E, DL, MVT::i8),
19233 DAG.ReplaceAllUsesOfValueWith(Op.getValue(0), cpOut);
19234 DAG.ReplaceAllUsesOfValueWith(Op.getValue(1), Success);
19235 DAG.ReplaceAllUsesOfValueWith(Op.getValue(2), EFLAGS.getValue(1));
19239 static SDValue LowerBITCAST(SDValue Op, const X86Subtarget *Subtarget,
19240 SelectionDAG &DAG) {
19241 MVT SrcVT = Op.getOperand(0).getSimpleValueType();
19242 MVT DstVT = Op.getSimpleValueType();
19244 if (SrcVT == MVT::v2i32 || SrcVT == MVT::v4i16 || SrcVT == MVT::v8i8) {
19245 assert(Subtarget->hasSSE2() && "Requires at least SSE2!");
19246 if (DstVT != MVT::f64)
19247 // This conversion needs to be expanded.
19250 SDValue InVec = Op->getOperand(0);
19252 unsigned NumElts = SrcVT.getVectorNumElements();
19253 MVT SVT = SrcVT.getVectorElementType();
19255 // Widen the vector in input in the case of MVT::v2i32.
19256 // Example: from MVT::v2i32 to MVT::v4i32.
19257 SmallVector<SDValue, 16> Elts;
19258 for (unsigned i = 0, e = NumElts; i != e; ++i)
19259 Elts.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SVT, InVec,
19260 DAG.getIntPtrConstant(i, dl)));
19262 // Explicitly mark the extra elements as Undef.
19263 Elts.append(NumElts, DAG.getUNDEF(SVT));
19265 EVT NewVT = EVT::getVectorVT(*DAG.getContext(), SVT, NumElts * 2);
19266 SDValue BV = DAG.getNode(ISD::BUILD_VECTOR, dl, NewVT, Elts);
19267 SDValue ToV2F64 = DAG.getBitcast(MVT::v2f64, BV);
19268 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, ToV2F64,
19269 DAG.getIntPtrConstant(0, dl));
19272 assert(Subtarget->is64Bit() && !Subtarget->hasSSE2() &&
19273 Subtarget->hasMMX() && "Unexpected custom BITCAST");
19274 assert((DstVT == MVT::i64 ||
19275 (DstVT.isVector() && DstVT.getSizeInBits()==64)) &&
19276 "Unexpected custom BITCAST");
19277 // i64 <=> MMX conversions are Legal.
19278 if (SrcVT==MVT::i64 && DstVT.isVector())
19280 if (DstVT==MVT::i64 && SrcVT.isVector())
19282 // MMX <=> MMX conversions are Legal.
19283 if (SrcVT.isVector() && DstVT.isVector())
19285 // All other conversions need to be expanded.
19289 /// Compute the horizontal sum of bytes in V for the elements of VT.
19291 /// Requires V to be a byte vector and VT to be an integer vector type with
19292 /// wider elements than V's type. The width of the elements of VT determines
19293 /// how many bytes of V are summed horizontally to produce each element of the
19295 static SDValue LowerHorizontalByteSum(SDValue V, MVT VT,
19296 const X86Subtarget *Subtarget,
19297 SelectionDAG &DAG) {
19299 MVT ByteVecVT = V.getSimpleValueType();
19300 MVT EltVT = VT.getVectorElementType();
19301 int NumElts = VT.getVectorNumElements();
19302 assert(ByteVecVT.getVectorElementType() == MVT::i8 &&
19303 "Expected value to have byte element type.");
19304 assert(EltVT != MVT::i8 &&
19305 "Horizontal byte sum only makes sense for wider elements!");
19306 unsigned VecSize = VT.getSizeInBits();
19307 assert(ByteVecVT.getSizeInBits() == VecSize && "Cannot change vector size!");
19309 // PSADBW instruction horizontally add all bytes and leave the result in i64
19310 // chunks, thus directly computes the pop count for v2i64 and v4i64.
19311 if (EltVT == MVT::i64) {
19312 SDValue Zeros = getZeroVector(ByteVecVT, Subtarget, DAG, DL);
19313 MVT SadVecVT = MVT::getVectorVT(MVT::i64, VecSize / 64);
19314 V = DAG.getNode(X86ISD::PSADBW, DL, SadVecVT, V, Zeros);
19315 return DAG.getBitcast(VT, V);
19318 if (EltVT == MVT::i32) {
19319 // We unpack the low half and high half into i32s interleaved with zeros so
19320 // that we can use PSADBW to horizontally sum them. The most useful part of
19321 // this is that it lines up the results of two PSADBW instructions to be
19322 // two v2i64 vectors which concatenated are the 4 population counts. We can
19323 // then use PACKUSWB to shrink and concatenate them into a v4i32 again.
19324 SDValue Zeros = getZeroVector(VT, Subtarget, DAG, DL);
19325 SDValue Low = DAG.getNode(X86ISD::UNPCKL, DL, VT, V, Zeros);
19326 SDValue High = DAG.getNode(X86ISD::UNPCKH, DL, VT, V, Zeros);
19328 // Do the horizontal sums into two v2i64s.
19329 Zeros = getZeroVector(ByteVecVT, Subtarget, DAG, DL);
19330 MVT SadVecVT = MVT::getVectorVT(MVT::i64, VecSize / 64);
19331 Low = DAG.getNode(X86ISD::PSADBW, DL, SadVecVT,
19332 DAG.getBitcast(ByteVecVT, Low), Zeros);
19333 High = DAG.getNode(X86ISD::PSADBW, DL, SadVecVT,
19334 DAG.getBitcast(ByteVecVT, High), Zeros);
19336 // Merge them together.
19337 MVT ShortVecVT = MVT::getVectorVT(MVT::i16, VecSize / 16);
19338 V = DAG.getNode(X86ISD::PACKUS, DL, ByteVecVT,
19339 DAG.getBitcast(ShortVecVT, Low),
19340 DAG.getBitcast(ShortVecVT, High));
19342 return DAG.getBitcast(VT, V);
19345 // The only element type left is i16.
19346 assert(EltVT == MVT::i16 && "Unknown how to handle type");
19348 // To obtain pop count for each i16 element starting from the pop count for
19349 // i8 elements, shift the i16s left by 8, sum as i8s, and then shift as i16s
19350 // right by 8. It is important to shift as i16s as i8 vector shift isn't
19351 // directly supported.
19352 SmallVector<SDValue, 16> Shifters(NumElts, DAG.getConstant(8, DL, EltVT));
19353 SDValue Shifter = DAG.getNode(ISD::BUILD_VECTOR, DL, VT, Shifters);
19354 SDValue Shl = DAG.getNode(ISD::SHL, DL, VT, DAG.getBitcast(VT, V), Shifter);
19355 V = DAG.getNode(ISD::ADD, DL, ByteVecVT, DAG.getBitcast(ByteVecVT, Shl),
19356 DAG.getBitcast(ByteVecVT, V));
19357 return DAG.getNode(ISD::SRL, DL, VT, DAG.getBitcast(VT, V), Shifter);
19360 static SDValue LowerVectorCTPOPInRegLUT(SDValue Op, SDLoc DL,
19361 const X86Subtarget *Subtarget,
19362 SelectionDAG &DAG) {
19363 MVT VT = Op.getSimpleValueType();
19364 MVT EltVT = VT.getVectorElementType();
19365 unsigned VecSize = VT.getSizeInBits();
19367 // Implement a lookup table in register by using an algorithm based on:
19368 // http://wm.ite.pl/articles/sse-popcount.html
19370 // The general idea is that every lower byte nibble in the input vector is an
19371 // index into a in-register pre-computed pop count table. We then split up the
19372 // input vector in two new ones: (1) a vector with only the shifted-right
19373 // higher nibbles for each byte and (2) a vector with the lower nibbles (and
19374 // masked out higher ones) for each byte. PSHUB is used separately with both
19375 // to index the in-register table. Next, both are added and the result is a
19376 // i8 vector where each element contains the pop count for input byte.
19378 // To obtain the pop count for elements != i8, we follow up with the same
19379 // approach and use additional tricks as described below.
19381 const int LUT[16] = {/* 0 */ 0, /* 1 */ 1, /* 2 */ 1, /* 3 */ 2,
19382 /* 4 */ 1, /* 5 */ 2, /* 6 */ 2, /* 7 */ 3,
19383 /* 8 */ 1, /* 9 */ 2, /* a */ 2, /* b */ 3,
19384 /* c */ 2, /* d */ 3, /* e */ 3, /* f */ 4};
19386 int NumByteElts = VecSize / 8;
19387 MVT ByteVecVT = MVT::getVectorVT(MVT::i8, NumByteElts);
19388 SDValue In = DAG.getBitcast(ByteVecVT, Op);
19389 SmallVector<SDValue, 16> LUTVec;
19390 for (int i = 0; i < NumByteElts; ++i)
19391 LUTVec.push_back(DAG.getConstant(LUT[i % 16], DL, MVT::i8));
19392 SDValue InRegLUT = DAG.getNode(ISD::BUILD_VECTOR, DL, ByteVecVT, LUTVec);
19393 SmallVector<SDValue, 16> Mask0F(NumByteElts,
19394 DAG.getConstant(0x0F, DL, MVT::i8));
19395 SDValue M0F = DAG.getNode(ISD::BUILD_VECTOR, DL, ByteVecVT, Mask0F);
19398 SmallVector<SDValue, 16> Four(NumByteElts, DAG.getConstant(4, DL, MVT::i8));
19399 SDValue FourV = DAG.getNode(ISD::BUILD_VECTOR, DL, ByteVecVT, Four);
19400 SDValue HighNibbles = DAG.getNode(ISD::SRL, DL, ByteVecVT, In, FourV);
19403 SDValue LowNibbles = DAG.getNode(ISD::AND, DL, ByteVecVT, In, M0F);
19405 // The input vector is used as the shuffle mask that index elements into the
19406 // LUT. After counting low and high nibbles, add the vector to obtain the
19407 // final pop count per i8 element.
19408 SDValue HighPopCnt =
19409 DAG.getNode(X86ISD::PSHUFB, DL, ByteVecVT, InRegLUT, HighNibbles);
19410 SDValue LowPopCnt =
19411 DAG.getNode(X86ISD::PSHUFB, DL, ByteVecVT, InRegLUT, LowNibbles);
19412 SDValue PopCnt = DAG.getNode(ISD::ADD, DL, ByteVecVT, HighPopCnt, LowPopCnt);
19414 if (EltVT == MVT::i8)
19417 return LowerHorizontalByteSum(PopCnt, VT, Subtarget, DAG);
19420 static SDValue LowerVectorCTPOPBitmath(SDValue Op, SDLoc DL,
19421 const X86Subtarget *Subtarget,
19422 SelectionDAG &DAG) {
19423 MVT VT = Op.getSimpleValueType();
19424 assert(VT.is128BitVector() &&
19425 "Only 128-bit vector bitmath lowering supported.");
19427 int VecSize = VT.getSizeInBits();
19428 MVT EltVT = VT.getVectorElementType();
19429 int Len = EltVT.getSizeInBits();
19431 // This is the vectorized version of the "best" algorithm from
19432 // http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
19433 // with a minor tweak to use a series of adds + shifts instead of vector
19434 // multiplications. Implemented for all integer vector types. We only use
19435 // this when we don't have SSSE3 which allows a LUT-based lowering that is
19436 // much faster, even faster than using native popcnt instructions.
19438 auto GetShift = [&](unsigned OpCode, SDValue V, int Shifter) {
19439 MVT VT = V.getSimpleValueType();
19440 SmallVector<SDValue, 32> Shifters(
19441 VT.getVectorNumElements(),
19442 DAG.getConstant(Shifter, DL, VT.getVectorElementType()));
19443 return DAG.getNode(OpCode, DL, VT, V,
19444 DAG.getNode(ISD::BUILD_VECTOR, DL, VT, Shifters));
19446 auto GetMask = [&](SDValue V, APInt Mask) {
19447 MVT VT = V.getSimpleValueType();
19448 SmallVector<SDValue, 32> Masks(
19449 VT.getVectorNumElements(),
19450 DAG.getConstant(Mask, DL, VT.getVectorElementType()));
19451 return DAG.getNode(ISD::AND, DL, VT, V,
19452 DAG.getNode(ISD::BUILD_VECTOR, DL, VT, Masks));
19455 // We don't want to incur the implicit masks required to SRL vNi8 vectors on
19456 // x86, so set the SRL type to have elements at least i16 wide. This is
19457 // correct because all of our SRLs are followed immediately by a mask anyways
19458 // that handles any bits that sneak into the high bits of the byte elements.
19459 MVT SrlVT = Len > 8 ? VT : MVT::getVectorVT(MVT::i16, VecSize / 16);
19463 // v = v - ((v >> 1) & 0x55555555...)
19465 DAG.getBitcast(VT, GetShift(ISD::SRL, DAG.getBitcast(SrlVT, V), 1));
19466 SDValue And = GetMask(Srl, APInt::getSplat(Len, APInt(8, 0x55)));
19467 V = DAG.getNode(ISD::SUB, DL, VT, V, And);
19469 // v = (v & 0x33333333...) + ((v >> 2) & 0x33333333...)
19470 SDValue AndLHS = GetMask(V, APInt::getSplat(Len, APInt(8, 0x33)));
19471 Srl = DAG.getBitcast(VT, GetShift(ISD::SRL, DAG.getBitcast(SrlVT, V), 2));
19472 SDValue AndRHS = GetMask(Srl, APInt::getSplat(Len, APInt(8, 0x33)));
19473 V = DAG.getNode(ISD::ADD, DL, VT, AndLHS, AndRHS);
19475 // v = (v + (v >> 4)) & 0x0F0F0F0F...
19476 Srl = DAG.getBitcast(VT, GetShift(ISD::SRL, DAG.getBitcast(SrlVT, V), 4));
19477 SDValue Add = DAG.getNode(ISD::ADD, DL, VT, V, Srl);
19478 V = GetMask(Add, APInt::getSplat(Len, APInt(8, 0x0F)));
19480 // At this point, V contains the byte-wise population count, and we are
19481 // merely doing a horizontal sum if necessary to get the wider element
19483 if (EltVT == MVT::i8)
19486 return LowerHorizontalByteSum(
19487 DAG.getBitcast(MVT::getVectorVT(MVT::i8, VecSize / 8), V), VT, Subtarget,
19491 static SDValue LowerVectorCTPOP(SDValue Op, const X86Subtarget *Subtarget,
19492 SelectionDAG &DAG) {
19493 MVT VT = Op.getSimpleValueType();
19494 // FIXME: Need to add AVX-512 support here!
19495 assert((VT.is256BitVector() || VT.is128BitVector()) &&
19496 "Unknown CTPOP type to handle");
19497 SDLoc DL(Op.getNode());
19498 SDValue Op0 = Op.getOperand(0);
19500 if (!Subtarget->hasSSSE3()) {
19501 // We can't use the fast LUT approach, so fall back on vectorized bitmath.
19502 assert(VT.is128BitVector() && "Only 128-bit vectors supported in SSE!");
19503 return LowerVectorCTPOPBitmath(Op0, DL, Subtarget, DAG);
19506 if (VT.is256BitVector() && !Subtarget->hasInt256()) {
19507 unsigned NumElems = VT.getVectorNumElements();
19509 // Extract each 128-bit vector, compute pop count and concat the result.
19510 SDValue LHS = Extract128BitVector(Op0, 0, DAG, DL);
19511 SDValue RHS = Extract128BitVector(Op0, NumElems/2, DAG, DL);
19513 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT,
19514 LowerVectorCTPOPInRegLUT(LHS, DL, Subtarget, DAG),
19515 LowerVectorCTPOPInRegLUT(RHS, DL, Subtarget, DAG));
19518 return LowerVectorCTPOPInRegLUT(Op0, DL, Subtarget, DAG);
19521 static SDValue LowerCTPOP(SDValue Op, const X86Subtarget *Subtarget,
19522 SelectionDAG &DAG) {
19523 assert(Op.getSimpleValueType().isVector() &&
19524 "We only do custom lowering for vector population count.");
19525 return LowerVectorCTPOP(Op, Subtarget, DAG);
19528 static SDValue LowerLOAD_SUB(SDValue Op, SelectionDAG &DAG) {
19529 SDNode *Node = Op.getNode();
19531 EVT T = Node->getValueType(0);
19532 SDValue negOp = DAG.getNode(ISD::SUB, dl, T,
19533 DAG.getConstant(0, dl, T), Node->getOperand(2));
19534 return DAG.getAtomic(ISD::ATOMIC_LOAD_ADD, dl,
19535 cast<AtomicSDNode>(Node)->getMemoryVT(),
19536 Node->getOperand(0),
19537 Node->getOperand(1), negOp,
19538 cast<AtomicSDNode>(Node)->getMemOperand(),
19539 cast<AtomicSDNode>(Node)->getOrdering(),
19540 cast<AtomicSDNode>(Node)->getSynchScope());
19543 static SDValue LowerATOMIC_STORE(SDValue Op, SelectionDAG &DAG) {
19544 SDNode *Node = Op.getNode();
19546 EVT VT = cast<AtomicSDNode>(Node)->getMemoryVT();
19548 // Convert seq_cst store -> xchg
19549 // Convert wide store -> swap (-> cmpxchg8b/cmpxchg16b)
19550 // FIXME: On 32-bit, store -> fist or movq would be more efficient
19551 // (The only way to get a 16-byte store is cmpxchg16b)
19552 // FIXME: 16-byte ATOMIC_SWAP isn't actually hooked up at the moment.
19553 if (cast<AtomicSDNode>(Node)->getOrdering() == SequentiallyConsistent ||
19554 !DAG.getTargetLoweringInfo().isTypeLegal(VT)) {
19555 SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
19556 cast<AtomicSDNode>(Node)->getMemoryVT(),
19557 Node->getOperand(0),
19558 Node->getOperand(1), Node->getOperand(2),
19559 cast<AtomicSDNode>(Node)->getMemOperand(),
19560 cast<AtomicSDNode>(Node)->getOrdering(),
19561 cast<AtomicSDNode>(Node)->getSynchScope());
19562 return Swap.getValue(1);
19564 // Other atomic stores have a simple pattern.
19568 static SDValue LowerADDC_ADDE_SUBC_SUBE(SDValue Op, SelectionDAG &DAG) {
19569 MVT VT = Op.getNode()->getSimpleValueType(0);
19571 // Let legalize expand this if it isn't a legal type yet.
19572 if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
19575 SDVTList VTs = DAG.getVTList(VT, MVT::i32);
19578 bool ExtraOp = false;
19579 switch (Op.getOpcode()) {
19580 default: llvm_unreachable("Invalid code");
19581 case ISD::ADDC: Opc = X86ISD::ADD; break;
19582 case ISD::ADDE: Opc = X86ISD::ADC; ExtraOp = true; break;
19583 case ISD::SUBC: Opc = X86ISD::SUB; break;
19584 case ISD::SUBE: Opc = X86ISD::SBB; ExtraOp = true; break;
19588 return DAG.getNode(Opc, SDLoc(Op), VTs, Op.getOperand(0),
19590 return DAG.getNode(Opc, SDLoc(Op), VTs, Op.getOperand(0),
19591 Op.getOperand(1), Op.getOperand(2));
19594 static SDValue LowerFSINCOS(SDValue Op, const X86Subtarget *Subtarget,
19595 SelectionDAG &DAG) {
19596 assert(Subtarget->isTargetDarwin() && Subtarget->is64Bit());
19598 // For MacOSX, we want to call an alternative entry point: __sincos_stret,
19599 // which returns the values as { float, float } (in XMM0) or
19600 // { double, double } (which is returned in XMM0, XMM1).
19602 SDValue Arg = Op.getOperand(0);
19603 EVT ArgVT = Arg.getValueType();
19604 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
19606 TargetLowering::ArgListTy Args;
19607 TargetLowering::ArgListEntry Entry;
19611 Entry.isSExt = false;
19612 Entry.isZExt = false;
19613 Args.push_back(Entry);
19615 bool isF64 = ArgVT == MVT::f64;
19616 // Only optimize x86_64 for now. i386 is a bit messy. For f32,
19617 // the small struct {f32, f32} is returned in (eax, edx). For f64,
19618 // the results are returned via SRet in memory.
19619 const char *LibcallName = isF64 ? "__sincos_stret" : "__sincosf_stret";
19620 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
19622 DAG.getExternalSymbol(LibcallName, TLI.getPointerTy(DAG.getDataLayout()));
19624 Type *RetTy = isF64
19625 ? (Type*)StructType::get(ArgTy, ArgTy, nullptr)
19626 : (Type*)VectorType::get(ArgTy, 4);
19628 TargetLowering::CallLoweringInfo CLI(DAG);
19629 CLI.setDebugLoc(dl).setChain(DAG.getEntryNode())
19630 .setCallee(CallingConv::C, RetTy, Callee, std::move(Args), 0);
19632 std::pair<SDValue, SDValue> CallResult = TLI.LowerCallTo(CLI);
19635 // Returned in xmm0 and xmm1.
19636 return CallResult.first;
19638 // Returned in bits 0:31 and 32:64 xmm0.
19639 SDValue SinVal = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, ArgVT,
19640 CallResult.first, DAG.getIntPtrConstant(0, dl));
19641 SDValue CosVal = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, ArgVT,
19642 CallResult.first, DAG.getIntPtrConstant(1, dl));
19643 SDVTList Tys = DAG.getVTList(ArgVT, ArgVT);
19644 return DAG.getNode(ISD::MERGE_VALUES, dl, Tys, SinVal, CosVal);
19647 static SDValue LowerMSCATTER(SDValue Op, const X86Subtarget *Subtarget,
19648 SelectionDAG &DAG) {
19649 assert(Subtarget->hasAVX512() &&
19650 "MGATHER/MSCATTER are supported on AVX-512 arch only");
19652 MaskedScatterSDNode *N = cast<MaskedScatterSDNode>(Op.getNode());
19653 MVT VT = N->getValue().getSimpleValueType();
19654 assert(VT.getScalarSizeInBits() >= 32 && "Unsupported scatter op");
19657 // X86 scatter kills mask register, so its type should be added to
19658 // the list of return values
19659 if (N->getNumValues() == 1) {
19660 SDValue Index = N->getIndex();
19661 if (!Subtarget->hasVLX() && !VT.is512BitVector() &&
19662 !Index.getSimpleValueType().is512BitVector())
19663 Index = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v8i64, Index);
19665 SDVTList VTs = DAG.getVTList(N->getMask().getValueType(), MVT::Other);
19666 SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2),
19667 N->getOperand(3), Index };
19669 SDValue NewScatter = DAG.getMaskedScatter(VTs, VT, dl, Ops, N->getMemOperand());
19670 DAG.ReplaceAllUsesWith(Op, SDValue(NewScatter.getNode(), 1));
19671 return SDValue(NewScatter.getNode(), 0);
19676 static SDValue LowerMGATHER(SDValue Op, const X86Subtarget *Subtarget,
19677 SelectionDAG &DAG) {
19678 assert(Subtarget->hasAVX512() &&
19679 "MGATHER/MSCATTER are supported on AVX-512 arch only");
19681 MaskedGatherSDNode *N = cast<MaskedGatherSDNode>(Op.getNode());
19682 MVT VT = Op.getSimpleValueType();
19683 assert(VT.getScalarSizeInBits() >= 32 && "Unsupported gather op");
19686 SDValue Index = N->getIndex();
19687 if (!Subtarget->hasVLX() && !VT.is512BitVector() &&
19688 !Index.getSimpleValueType().is512BitVector()) {
19689 Index = DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v8i64, Index);
19690 SDValue Ops[] = { N->getOperand(0), N->getOperand(1), N->getOperand(2),
19691 N->getOperand(3), Index };
19692 DAG.UpdateNodeOperands(N, Ops);
19697 SDValue X86TargetLowering::LowerGC_TRANSITION_START(SDValue Op,
19698 SelectionDAG &DAG) const {
19699 // TODO: Eventually, the lowering of these nodes should be informed by or
19700 // deferred to the GC strategy for the function in which they appear. For
19701 // now, however, they must be lowered to something. Since they are logically
19702 // no-ops in the case of a null GC strategy (or a GC strategy which does not
19703 // require special handling for these nodes), lower them as literal NOOPs for
19705 SmallVector<SDValue, 2> Ops;
19707 Ops.push_back(Op.getOperand(0));
19708 if (Op->getGluedNode())
19709 Ops.push_back(Op->getOperand(Op->getNumOperands() - 1));
19712 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
19713 SDValue NOOP(DAG.getMachineNode(X86::NOOP, SDLoc(Op), VTs, Ops), 0);
19718 SDValue X86TargetLowering::LowerGC_TRANSITION_END(SDValue Op,
19719 SelectionDAG &DAG) const {
19720 // TODO: Eventually, the lowering of these nodes should be informed by or
19721 // deferred to the GC strategy for the function in which they appear. For
19722 // now, however, they must be lowered to something. Since they are logically
19723 // no-ops in the case of a null GC strategy (or a GC strategy which does not
19724 // require special handling for these nodes), lower them as literal NOOPs for
19726 SmallVector<SDValue, 2> Ops;
19728 Ops.push_back(Op.getOperand(0));
19729 if (Op->getGluedNode())
19730 Ops.push_back(Op->getOperand(Op->getNumOperands() - 1));
19733 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Glue);
19734 SDValue NOOP(DAG.getMachineNode(X86::NOOP, SDLoc(Op), VTs, Ops), 0);
19739 /// LowerOperation - Provide custom lowering hooks for some operations.
19741 SDValue X86TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
19742 switch (Op.getOpcode()) {
19743 default: llvm_unreachable("Should not custom lower this!");
19744 case ISD::ATOMIC_FENCE: return LowerATOMIC_FENCE(Op, Subtarget, DAG);
19745 case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS:
19746 return LowerCMP_SWAP(Op, Subtarget, DAG);
19747 case ISD::CTPOP: return LowerCTPOP(Op, Subtarget, DAG);
19748 case ISD::ATOMIC_LOAD_SUB: return LowerLOAD_SUB(Op,DAG);
19749 case ISD::ATOMIC_STORE: return LowerATOMIC_STORE(Op,DAG);
19750 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
19751 case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, Subtarget, DAG);
19752 case ISD::VECTOR_SHUFFLE: return lowerVectorShuffle(Op, Subtarget, DAG);
19753 case ISD::VSELECT: return LowerVSELECT(Op, DAG);
19754 case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
19755 case ISD::INSERT_VECTOR_ELT: return LowerINSERT_VECTOR_ELT(Op, DAG);
19756 case ISD::EXTRACT_SUBVECTOR: return LowerEXTRACT_SUBVECTOR(Op,Subtarget,DAG);
19757 case ISD::INSERT_SUBVECTOR: return LowerINSERT_SUBVECTOR(Op, Subtarget,DAG);
19758 case ISD::SCALAR_TO_VECTOR: return LowerSCALAR_TO_VECTOR(Op, DAG);
19759 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
19760 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
19761 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
19762 case ISD::ExternalSymbol: return LowerExternalSymbol(Op, DAG);
19763 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
19764 case ISD::SHL_PARTS:
19765 case ISD::SRA_PARTS:
19766 case ISD::SRL_PARTS: return LowerShiftParts(Op, DAG);
19767 case ISD::SINT_TO_FP: return LowerSINT_TO_FP(Op, DAG);
19768 case ISD::UINT_TO_FP: return LowerUINT_TO_FP(Op, DAG);
19769 case ISD::TRUNCATE: return LowerTRUNCATE(Op, DAG);
19770 case ISD::ZERO_EXTEND: return LowerZERO_EXTEND(Op, Subtarget, DAG);
19771 case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, Subtarget, DAG);
19772 case ISD::ANY_EXTEND: return LowerANY_EXTEND(Op, Subtarget, DAG);
19773 case ISD::SIGN_EXTEND_VECTOR_INREG:
19774 return LowerSIGN_EXTEND_VECTOR_INREG(Op, Subtarget, DAG);
19775 case ISD::FP_TO_SINT: return LowerFP_TO_SINT(Op, DAG);
19776 case ISD::FP_TO_UINT: return LowerFP_TO_UINT(Op, DAG);
19777 case ISD::FP_EXTEND: return LowerFP_EXTEND(Op, DAG);
19778 case ISD::LOAD: return LowerExtendedLoad(Op, Subtarget, DAG);
19780 case ISD::FNEG: return LowerFABSorFNEG(Op, DAG);
19781 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
19782 case ISD::FGETSIGN: return LowerFGETSIGN(Op, DAG);
19783 case ISD::SETCC: return LowerSETCC(Op, DAG);
19784 case ISD::SETCCE: return LowerSETCCE(Op, DAG);
19785 case ISD::SELECT: return LowerSELECT(Op, DAG);
19786 case ISD::BRCOND: return LowerBRCOND(Op, DAG);
19787 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
19788 case ISD::VASTART: return LowerVASTART(Op, DAG);
19789 case ISD::VAARG: return LowerVAARG(Op, DAG);
19790 case ISD::VACOPY: return LowerVACOPY(Op, Subtarget, DAG);
19791 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, Subtarget, DAG);
19792 case ISD::INTRINSIC_VOID:
19793 case ISD::INTRINSIC_W_CHAIN: return LowerINTRINSIC_W_CHAIN(Op, Subtarget, DAG);
19794 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
19795 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
19796 case ISD::FRAME_TO_ARGS_OFFSET:
19797 return LowerFRAME_TO_ARGS_OFFSET(Op, DAG);
19798 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
19799 case ISD::EH_RETURN: return LowerEH_RETURN(Op, DAG);
19800 case ISD::EH_SJLJ_SETJMP: return lowerEH_SJLJ_SETJMP(Op, DAG);
19801 case ISD::EH_SJLJ_LONGJMP: return lowerEH_SJLJ_LONGJMP(Op, DAG);
19802 case ISD::INIT_TRAMPOLINE: return LowerINIT_TRAMPOLINE(Op, DAG);
19803 case ISD::ADJUST_TRAMPOLINE: return LowerADJUST_TRAMPOLINE(Op, DAG);
19804 case ISD::FLT_ROUNDS_: return LowerFLT_ROUNDS_(Op, DAG);
19805 case ISD::CTLZ: return LowerCTLZ(Op, Subtarget, DAG);
19806 case ISD::CTLZ_ZERO_UNDEF: return LowerCTLZ_ZERO_UNDEF(Op, Subtarget, DAG);
19808 case ISD::CTTZ_ZERO_UNDEF: return LowerCTTZ(Op, DAG);
19809 case ISD::MUL: return LowerMUL(Op, Subtarget, DAG);
19810 case ISD::UMUL_LOHI:
19811 case ISD::SMUL_LOHI: return LowerMUL_LOHI(Op, Subtarget, DAG);
19812 case ISD::ROTL: return LowerRotate(Op, Subtarget, DAG);
19815 case ISD::SHL: return LowerShift(Op, Subtarget, DAG);
19821 case ISD::UMULO: return LowerXALUO(Op, DAG);
19822 case ISD::READCYCLECOUNTER: return LowerREADCYCLECOUNTER(Op, Subtarget,DAG);
19823 case ISD::BITCAST: return LowerBITCAST(Op, Subtarget, DAG);
19827 case ISD::SUBE: return LowerADDC_ADDE_SUBC_SUBE(Op, DAG);
19828 case ISD::ADD: return LowerADD(Op, DAG);
19829 case ISD::SUB: return LowerSUB(Op, DAG);
19833 case ISD::UMIN: return LowerMINMAX(Op, DAG);
19834 case ISD::FSINCOS: return LowerFSINCOS(Op, Subtarget, DAG);
19835 case ISD::MGATHER: return LowerMGATHER(Op, Subtarget, DAG);
19836 case ISD::MSCATTER: return LowerMSCATTER(Op, Subtarget, DAG);
19837 case ISD::GC_TRANSITION_START:
19838 return LowerGC_TRANSITION_START(Op, DAG);
19839 case ISD::GC_TRANSITION_END: return LowerGC_TRANSITION_END(Op, DAG);
19843 /// ReplaceNodeResults - Replace a node with an illegal result type
19844 /// with a new node built out of custom code.
19845 void X86TargetLowering::ReplaceNodeResults(SDNode *N,
19846 SmallVectorImpl<SDValue>&Results,
19847 SelectionDAG &DAG) const {
19849 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
19850 switch (N->getOpcode()) {
19852 llvm_unreachable("Do not know how to custom type legalize this operation!");
19853 case X86ISD::AVG: {
19854 // Legalize types for X86ISD::AVG by expanding vectors.
19855 assert(Subtarget->hasSSE2() && "Requires at least SSE2!");
19857 auto InVT = N->getValueType(0);
19858 auto InVTSize = InVT.getSizeInBits();
19859 const unsigned RegSize =
19860 (InVTSize > 128) ? ((InVTSize > 256) ? 512 : 256) : 128;
19861 assert((!Subtarget->hasAVX512() || RegSize < 512) &&
19862 "512-bit vector requires AVX512");
19863 assert((!Subtarget->hasAVX2() || RegSize < 256) &&
19864 "256-bit vector requires AVX2");
19866 auto ElemVT = InVT.getVectorElementType();
19867 auto RegVT = EVT::getVectorVT(*DAG.getContext(), ElemVT,
19868 RegSize / ElemVT.getSizeInBits());
19869 assert(RegSize % InVT.getSizeInBits() == 0);
19870 unsigned NumConcat = RegSize / InVT.getSizeInBits();
19872 SmallVector<SDValue, 16> Ops(NumConcat, DAG.getUNDEF(InVT));
19873 Ops[0] = N->getOperand(0);
19874 SDValue InVec0 = DAG.getNode(ISD::CONCAT_VECTORS, dl, RegVT, Ops);
19875 Ops[0] = N->getOperand(1);
19876 SDValue InVec1 = DAG.getNode(ISD::CONCAT_VECTORS, dl, RegVT, Ops);
19878 SDValue Res = DAG.getNode(X86ISD::AVG, dl, RegVT, InVec0, InVec1);
19879 Results.push_back(DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, InVT, Res,
19880 DAG.getIntPtrConstant(0, dl)));
19883 // We might have generated v2f32 FMIN/FMAX operations. Widen them to v4f32.
19884 case X86ISD::FMINC:
19886 case X86ISD::FMAXC:
19887 case X86ISD::FMAX: {
19888 EVT VT = N->getValueType(0);
19889 assert(VT == MVT::v2f32 && "Unexpected type (!= v2f32) on FMIN/FMAX.");
19890 SDValue UNDEF = DAG.getUNDEF(VT);
19891 SDValue LHS = DAG.getNode(ISD::CONCAT_VECTORS, dl, MVT::v4f32,
19892 N->getOperand(0), UNDEF);
19893 SDValue RHS = DAG.getNode(ISD::CONCAT_VECTORS, dl, MVT::v4f32,
19894 N->getOperand(1), UNDEF);
19895 Results.push_back(DAG.getNode(N->getOpcode(), dl, MVT::v4f32, LHS, RHS));
19898 case ISD::SIGN_EXTEND_INREG:
19903 // We don't want to expand or promote these.
19910 case ISD::UDIVREM: {
19911 SDValue V = LowerWin64_i128OP(SDValue(N,0), DAG);
19912 Results.push_back(V);
19915 case ISD::FP_TO_SINT:
19916 case ISD::FP_TO_UINT: {
19917 bool IsSigned = N->getOpcode() == ISD::FP_TO_SINT;
19919 std::pair<SDValue,SDValue> Vals =
19920 FP_TO_INTHelper(SDValue(N, 0), DAG, IsSigned, /*IsReplace=*/ true);
19921 SDValue FIST = Vals.first, StackSlot = Vals.second;
19922 if (FIST.getNode()) {
19923 EVT VT = N->getValueType(0);
19924 // Return a load from the stack slot.
19925 if (StackSlot.getNode())
19926 Results.push_back(DAG.getLoad(VT, dl, FIST, StackSlot,
19927 MachinePointerInfo(),
19928 false, false, false, 0));
19930 Results.push_back(FIST);
19934 case ISD::UINT_TO_FP: {
19935 assert(Subtarget->hasSSE2() && "Requires at least SSE2!");
19936 if (N->getOperand(0).getValueType() != MVT::v2i32 ||
19937 N->getValueType(0) != MVT::v2f32)
19939 SDValue ZExtIn = DAG.getNode(ISD::ZERO_EXTEND, dl, MVT::v2i64,
19941 SDValue Bias = DAG.getConstantFP(BitsToDouble(0x4330000000000000ULL), dl,
19943 SDValue VBias = DAG.getNode(ISD::BUILD_VECTOR, dl, MVT::v2f64, Bias, Bias);
19944 SDValue Or = DAG.getNode(ISD::OR, dl, MVT::v2i64, ZExtIn,
19945 DAG.getBitcast(MVT::v2i64, VBias));
19946 Or = DAG.getBitcast(MVT::v2f64, Or);
19947 // TODO: Are there any fast-math-flags to propagate here?
19948 SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::v2f64, Or, VBias);
19949 Results.push_back(DAG.getNode(X86ISD::VFPROUND, dl, MVT::v4f32, Sub));
19952 case ISD::FP_ROUND: {
19953 if (!TLI.isTypeLegal(N->getOperand(0).getValueType()))
19955 SDValue V = DAG.getNode(X86ISD::VFPROUND, dl, MVT::v4f32, N->getOperand(0));
19956 Results.push_back(V);
19959 case ISD::FP_EXTEND: {
19960 // Right now, only MVT::v2f32 has OperationAction for FP_EXTEND.
19961 // No other ValueType for FP_EXTEND should reach this point.
19962 assert(N->getValueType(0) == MVT::v2f32 &&
19963 "Do not know how to legalize this Node");
19966 case ISD::INTRINSIC_W_CHAIN: {
19967 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
19969 default : llvm_unreachable("Do not know how to custom type "
19970 "legalize this intrinsic operation!");
19971 case Intrinsic::x86_rdtsc:
19972 return getReadTimeStampCounter(N, dl, X86ISD::RDTSC_DAG, DAG, Subtarget,
19974 case Intrinsic::x86_rdtscp:
19975 return getReadTimeStampCounter(N, dl, X86ISD::RDTSCP_DAG, DAG, Subtarget,
19977 case Intrinsic::x86_rdpmc:
19978 return getReadPerformanceCounter(N, dl, DAG, Subtarget, Results);
19981 case ISD::READCYCLECOUNTER: {
19982 return getReadTimeStampCounter(N, dl, X86ISD::RDTSC_DAG, DAG, Subtarget,
19985 case ISD::ATOMIC_CMP_SWAP_WITH_SUCCESS: {
19986 EVT T = N->getValueType(0);
19987 assert((T == MVT::i64 || T == MVT::i128) && "can only expand cmpxchg pair");
19988 bool Regs64bit = T == MVT::i128;
19989 MVT HalfT = Regs64bit ? MVT::i64 : MVT::i32;
19990 SDValue cpInL, cpInH;
19991 cpInL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(2),
19992 DAG.getConstant(0, dl, HalfT));
19993 cpInH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(2),
19994 DAG.getConstant(1, dl, HalfT));
19995 cpInL = DAG.getCopyToReg(N->getOperand(0), dl,
19996 Regs64bit ? X86::RAX : X86::EAX,
19998 cpInH = DAG.getCopyToReg(cpInL.getValue(0), dl,
19999 Regs64bit ? X86::RDX : X86::EDX,
20000 cpInH, cpInL.getValue(1));
20001 SDValue swapInL, swapInH;
20002 swapInL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(3),
20003 DAG.getConstant(0, dl, HalfT));
20004 swapInH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, HalfT, N->getOperand(3),
20005 DAG.getConstant(1, dl, HalfT));
20006 swapInL = DAG.getCopyToReg(cpInH.getValue(0), dl,
20007 Regs64bit ? X86::RBX : X86::EBX,
20008 swapInL, cpInH.getValue(1));
20009 swapInH = DAG.getCopyToReg(swapInL.getValue(0), dl,
20010 Regs64bit ? X86::RCX : X86::ECX,
20011 swapInH, swapInL.getValue(1));
20012 SDValue Ops[] = { swapInH.getValue(0),
20014 swapInH.getValue(1) };
20015 SDVTList Tys = DAG.getVTList(MVT::Other, MVT::Glue);
20016 MachineMemOperand *MMO = cast<AtomicSDNode>(N)->getMemOperand();
20017 unsigned Opcode = Regs64bit ? X86ISD::LCMPXCHG16_DAG :
20018 X86ISD::LCMPXCHG8_DAG;
20019 SDValue Result = DAG.getMemIntrinsicNode(Opcode, dl, Tys, Ops, T, MMO);
20020 SDValue cpOutL = DAG.getCopyFromReg(Result.getValue(0), dl,
20021 Regs64bit ? X86::RAX : X86::EAX,
20022 HalfT, Result.getValue(1));
20023 SDValue cpOutH = DAG.getCopyFromReg(cpOutL.getValue(1), dl,
20024 Regs64bit ? X86::RDX : X86::EDX,
20025 HalfT, cpOutL.getValue(2));
20026 SDValue OpsF[] = { cpOutL.getValue(0), cpOutH.getValue(0)};
20028 SDValue EFLAGS = DAG.getCopyFromReg(cpOutH.getValue(1), dl, X86::EFLAGS,
20029 MVT::i32, cpOutH.getValue(2));
20031 DAG.getNode(X86ISD::SETCC, dl, MVT::i8,
20032 DAG.getConstant(X86::COND_E, dl, MVT::i8), EFLAGS);
20033 Success = DAG.getZExtOrTrunc(Success, dl, N->getValueType(1));
20035 Results.push_back(DAG.getNode(ISD::BUILD_PAIR, dl, T, OpsF));
20036 Results.push_back(Success);
20037 Results.push_back(EFLAGS.getValue(1));
20040 case ISD::ATOMIC_SWAP:
20041 case ISD::ATOMIC_LOAD_ADD:
20042 case ISD::ATOMIC_LOAD_SUB:
20043 case ISD::ATOMIC_LOAD_AND:
20044 case ISD::ATOMIC_LOAD_OR:
20045 case ISD::ATOMIC_LOAD_XOR:
20046 case ISD::ATOMIC_LOAD_NAND:
20047 case ISD::ATOMIC_LOAD_MIN:
20048 case ISD::ATOMIC_LOAD_MAX:
20049 case ISD::ATOMIC_LOAD_UMIN:
20050 case ISD::ATOMIC_LOAD_UMAX:
20051 case ISD::ATOMIC_LOAD: {
20052 // Delegate to generic TypeLegalization. Situations we can really handle
20053 // should have already been dealt with by AtomicExpandPass.cpp.
20056 case ISD::BITCAST: {
20057 assert(Subtarget->hasSSE2() && "Requires at least SSE2!");
20058 EVT DstVT = N->getValueType(0);
20059 EVT SrcVT = N->getOperand(0)->getValueType(0);
20061 if (SrcVT != MVT::f64 ||
20062 (DstVT != MVT::v2i32 && DstVT != MVT::v4i16 && DstVT != MVT::v8i8))
20065 unsigned NumElts = DstVT.getVectorNumElements();
20066 EVT SVT = DstVT.getVectorElementType();
20067 EVT WiderVT = EVT::getVectorVT(*DAG.getContext(), SVT, NumElts * 2);
20068 SDValue Expanded = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
20069 MVT::v2f64, N->getOperand(0));
20070 SDValue ToVecInt = DAG.getBitcast(WiderVT, Expanded);
20072 if (ExperimentalVectorWideningLegalization) {
20073 // If we are legalizing vectors by widening, we already have the desired
20074 // legal vector type, just return it.
20075 Results.push_back(ToVecInt);
20079 SmallVector<SDValue, 8> Elts;
20080 for (unsigned i = 0, e = NumElts; i != e; ++i)
20081 Elts.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, SVT,
20082 ToVecInt, DAG.getIntPtrConstant(i, dl)));
20084 Results.push_back(DAG.getNode(ISD::BUILD_VECTOR, dl, DstVT, Elts));
20089 const char *X86TargetLowering::getTargetNodeName(unsigned Opcode) const {
20090 switch ((X86ISD::NodeType)Opcode) {
20091 case X86ISD::FIRST_NUMBER: break;
20092 case X86ISD::BSF: return "X86ISD::BSF";
20093 case X86ISD::BSR: return "X86ISD::BSR";
20094 case X86ISD::SHLD: return "X86ISD::SHLD";
20095 case X86ISD::SHRD: return "X86ISD::SHRD";
20096 case X86ISD::FAND: return "X86ISD::FAND";
20097 case X86ISD::FANDN: return "X86ISD::FANDN";
20098 case X86ISD::FOR: return "X86ISD::FOR";
20099 case X86ISD::FXOR: return "X86ISD::FXOR";
20100 case X86ISD::FILD: return "X86ISD::FILD";
20101 case X86ISD::FILD_FLAG: return "X86ISD::FILD_FLAG";
20102 case X86ISD::FP_TO_INT16_IN_MEM: return "X86ISD::FP_TO_INT16_IN_MEM";
20103 case X86ISD::FP_TO_INT32_IN_MEM: return "X86ISD::FP_TO_INT32_IN_MEM";
20104 case X86ISD::FP_TO_INT64_IN_MEM: return "X86ISD::FP_TO_INT64_IN_MEM";
20105 case X86ISD::FLD: return "X86ISD::FLD";
20106 case X86ISD::FST: return "X86ISD::FST";
20107 case X86ISD::CALL: return "X86ISD::CALL";
20108 case X86ISD::RDTSC_DAG: return "X86ISD::RDTSC_DAG";
20109 case X86ISD::RDTSCP_DAG: return "X86ISD::RDTSCP_DAG";
20110 case X86ISD::RDPMC_DAG: return "X86ISD::RDPMC_DAG";
20111 case X86ISD::BT: return "X86ISD::BT";
20112 case X86ISD::CMP: return "X86ISD::CMP";
20113 case X86ISD::COMI: return "X86ISD::COMI";
20114 case X86ISD::UCOMI: return "X86ISD::UCOMI";
20115 case X86ISD::CMPM: return "X86ISD::CMPM";
20116 case X86ISD::CMPMU: return "X86ISD::CMPMU";
20117 case X86ISD::CMPM_RND: return "X86ISD::CMPM_RND";
20118 case X86ISD::SETCC: return "X86ISD::SETCC";
20119 case X86ISD::SETCC_CARRY: return "X86ISD::SETCC_CARRY";
20120 case X86ISD::FSETCC: return "X86ISD::FSETCC";
20121 case X86ISD::FGETSIGNx86: return "X86ISD::FGETSIGNx86";
20122 case X86ISD::CMOV: return "X86ISD::CMOV";
20123 case X86ISD::BRCOND: return "X86ISD::BRCOND";
20124 case X86ISD::RET_FLAG: return "X86ISD::RET_FLAG";
20125 case X86ISD::REP_STOS: return "X86ISD::REP_STOS";
20126 case X86ISD::REP_MOVS: return "X86ISD::REP_MOVS";
20127 case X86ISD::GlobalBaseReg: return "X86ISD::GlobalBaseReg";
20128 case X86ISD::Wrapper: return "X86ISD::Wrapper";
20129 case X86ISD::WrapperRIP: return "X86ISD::WrapperRIP";
20130 case X86ISD::MOVDQ2Q: return "X86ISD::MOVDQ2Q";
20131 case X86ISD::MMX_MOVD2W: return "X86ISD::MMX_MOVD2W";
20132 case X86ISD::MMX_MOVW2D: return "X86ISD::MMX_MOVW2D";
20133 case X86ISD::PEXTRB: return "X86ISD::PEXTRB";
20134 case X86ISD::PEXTRW: return "X86ISD::PEXTRW";
20135 case X86ISD::INSERTPS: return "X86ISD::INSERTPS";
20136 case X86ISD::PINSRB: return "X86ISD::PINSRB";
20137 case X86ISD::PINSRW: return "X86ISD::PINSRW";
20138 case X86ISD::MMX_PINSRW: return "X86ISD::MMX_PINSRW";
20139 case X86ISD::PSHUFB: return "X86ISD::PSHUFB";
20140 case X86ISD::ANDNP: return "X86ISD::ANDNP";
20141 case X86ISD::PSIGN: return "X86ISD::PSIGN";
20142 case X86ISD::BLENDI: return "X86ISD::BLENDI";
20143 case X86ISD::SHRUNKBLEND: return "X86ISD::SHRUNKBLEND";
20144 case X86ISD::ADDUS: return "X86ISD::ADDUS";
20145 case X86ISD::SUBUS: return "X86ISD::SUBUS";
20146 case X86ISD::HADD: return "X86ISD::HADD";
20147 case X86ISD::HSUB: return "X86ISD::HSUB";
20148 case X86ISD::FHADD: return "X86ISD::FHADD";
20149 case X86ISD::FHSUB: return "X86ISD::FHSUB";
20150 case X86ISD::ABS: return "X86ISD::ABS";
20151 case X86ISD::CONFLICT: return "X86ISD::CONFLICT";
20152 case X86ISD::FMAX: return "X86ISD::FMAX";
20153 case X86ISD::FMAX_RND: return "X86ISD::FMAX_RND";
20154 case X86ISD::FMIN: return "X86ISD::FMIN";
20155 case X86ISD::FMIN_RND: return "X86ISD::FMIN_RND";
20156 case X86ISD::FMAXC: return "X86ISD::FMAXC";
20157 case X86ISD::FMINC: return "X86ISD::FMINC";
20158 case X86ISD::FRSQRT: return "X86ISD::FRSQRT";
20159 case X86ISD::FRCP: return "X86ISD::FRCP";
20160 case X86ISD::EXTRQI: return "X86ISD::EXTRQI";
20161 case X86ISD::INSERTQI: return "X86ISD::INSERTQI";
20162 case X86ISD::TLSADDR: return "X86ISD::TLSADDR";
20163 case X86ISD::TLSBASEADDR: return "X86ISD::TLSBASEADDR";
20164 case X86ISD::TLSCALL: return "X86ISD::TLSCALL";
20165 case X86ISD::EH_SJLJ_SETJMP: return "X86ISD::EH_SJLJ_SETJMP";
20166 case X86ISD::EH_SJLJ_LONGJMP: return "X86ISD::EH_SJLJ_LONGJMP";
20167 case X86ISD::EH_RETURN: return "X86ISD::EH_RETURN";
20168 case X86ISD::TC_RETURN: return "X86ISD::TC_RETURN";
20169 case X86ISD::FNSTCW16m: return "X86ISD::FNSTCW16m";
20170 case X86ISD::FNSTSW16r: return "X86ISD::FNSTSW16r";
20171 case X86ISD::LCMPXCHG_DAG: return "X86ISD::LCMPXCHG_DAG";
20172 case X86ISD::LCMPXCHG8_DAG: return "X86ISD::LCMPXCHG8_DAG";
20173 case X86ISD::LCMPXCHG16_DAG: return "X86ISD::LCMPXCHG16_DAG";
20174 case X86ISD::VZEXT_MOVL: return "X86ISD::VZEXT_MOVL";
20175 case X86ISD::VZEXT_LOAD: return "X86ISD::VZEXT_LOAD";
20176 case X86ISD::VZEXT: return "X86ISD::VZEXT";
20177 case X86ISD::VSEXT: return "X86ISD::VSEXT";
20178 case X86ISD::VTRUNC: return "X86ISD::VTRUNC";
20179 case X86ISD::VTRUNCS: return "X86ISD::VTRUNCS";
20180 case X86ISD::VTRUNCUS: return "X86ISD::VTRUNCUS";
20181 case X86ISD::VINSERT: return "X86ISD::VINSERT";
20182 case X86ISD::VFPEXT: return "X86ISD::VFPEXT";
20183 case X86ISD::VFPROUND: return "X86ISD::VFPROUND";
20184 case X86ISD::CVTDQ2PD: return "X86ISD::CVTDQ2PD";
20185 case X86ISD::CVTUDQ2PD: return "X86ISD::CVTUDQ2PD";
20186 case X86ISD::VSHLDQ: return "X86ISD::VSHLDQ";
20187 case X86ISD::VSRLDQ: return "X86ISD::VSRLDQ";
20188 case X86ISD::VSHL: return "X86ISD::VSHL";
20189 case X86ISD::VSRL: return "X86ISD::VSRL";
20190 case X86ISD::VSRA: return "X86ISD::VSRA";
20191 case X86ISD::VSHLI: return "X86ISD::VSHLI";
20192 case X86ISD::VSRLI: return "X86ISD::VSRLI";
20193 case X86ISD::VSRAI: return "X86ISD::VSRAI";
20194 case X86ISD::CMPP: return "X86ISD::CMPP";
20195 case X86ISD::PCMPEQ: return "X86ISD::PCMPEQ";
20196 case X86ISD::PCMPGT: return "X86ISD::PCMPGT";
20197 case X86ISD::PCMPEQM: return "X86ISD::PCMPEQM";
20198 case X86ISD::PCMPGTM: return "X86ISD::PCMPGTM";
20199 case X86ISD::ADD: return "X86ISD::ADD";
20200 case X86ISD::SUB: return "X86ISD::SUB";
20201 case X86ISD::ADC: return "X86ISD::ADC";
20202 case X86ISD::SBB: return "X86ISD::SBB";
20203 case X86ISD::SMUL: return "X86ISD::SMUL";
20204 case X86ISD::UMUL: return "X86ISD::UMUL";
20205 case X86ISD::SMUL8: return "X86ISD::SMUL8";
20206 case X86ISD::UMUL8: return "X86ISD::UMUL8";
20207 case X86ISD::SDIVREM8_SEXT_HREG: return "X86ISD::SDIVREM8_SEXT_HREG";
20208 case X86ISD::UDIVREM8_ZEXT_HREG: return "X86ISD::UDIVREM8_ZEXT_HREG";
20209 case X86ISD::INC: return "X86ISD::INC";
20210 case X86ISD::DEC: return "X86ISD::DEC";
20211 case X86ISD::OR: return "X86ISD::OR";
20212 case X86ISD::XOR: return "X86ISD::XOR";
20213 case X86ISD::AND: return "X86ISD::AND";
20214 case X86ISD::BEXTR: return "X86ISD::BEXTR";
20215 case X86ISD::MUL_IMM: return "X86ISD::MUL_IMM";
20216 case X86ISD::PTEST: return "X86ISD::PTEST";
20217 case X86ISD::TESTP: return "X86ISD::TESTP";
20218 case X86ISD::TESTM: return "X86ISD::TESTM";
20219 case X86ISD::TESTNM: return "X86ISD::TESTNM";
20220 case X86ISD::KORTEST: return "X86ISD::KORTEST";
20221 case X86ISD::KTEST: return "X86ISD::KTEST";
20222 case X86ISD::PACKSS: return "X86ISD::PACKSS";
20223 case X86ISD::PACKUS: return "X86ISD::PACKUS";
20224 case X86ISD::PALIGNR: return "X86ISD::PALIGNR";
20225 case X86ISD::VALIGN: return "X86ISD::VALIGN";
20226 case X86ISD::PSHUFD: return "X86ISD::PSHUFD";
20227 case X86ISD::PSHUFHW: return "X86ISD::PSHUFHW";
20228 case X86ISD::PSHUFLW: return "X86ISD::PSHUFLW";
20229 case X86ISD::SHUFP: return "X86ISD::SHUFP";
20230 case X86ISD::SHUF128: return "X86ISD::SHUF128";
20231 case X86ISD::MOVLHPS: return "X86ISD::MOVLHPS";
20232 case X86ISD::MOVLHPD: return "X86ISD::MOVLHPD";
20233 case X86ISD::MOVHLPS: return "X86ISD::MOVHLPS";
20234 case X86ISD::MOVLPS: return "X86ISD::MOVLPS";
20235 case X86ISD::MOVLPD: return "X86ISD::MOVLPD";
20236 case X86ISD::MOVDDUP: return "X86ISD::MOVDDUP";
20237 case X86ISD::MOVSHDUP: return "X86ISD::MOVSHDUP";
20238 case X86ISD::MOVSLDUP: return "X86ISD::MOVSLDUP";
20239 case X86ISD::MOVSD: return "X86ISD::MOVSD";
20240 case X86ISD::MOVSS: return "X86ISD::MOVSS";
20241 case X86ISD::UNPCKL: return "X86ISD::UNPCKL";
20242 case X86ISD::UNPCKH: return "X86ISD::UNPCKH";
20243 case X86ISD::VBROADCAST: return "X86ISD::VBROADCAST";
20244 case X86ISD::VBROADCASTM: return "X86ISD::VBROADCASTM";
20245 case X86ISD::SUBV_BROADCAST: return "X86ISD::SUBV_BROADCAST";
20246 case X86ISD::VEXTRACT: return "X86ISD::VEXTRACT";
20247 case X86ISD::VPERMILPV: return "X86ISD::VPERMILPV";
20248 case X86ISD::VPERMILPI: return "X86ISD::VPERMILPI";
20249 case X86ISD::VPERM2X128: return "X86ISD::VPERM2X128";
20250 case X86ISD::VPERMV: return "X86ISD::VPERMV";
20251 case X86ISD::VPERMV3: return "X86ISD::VPERMV3";
20252 case X86ISD::VPERMIV3: return "X86ISD::VPERMIV3";
20253 case X86ISD::VPERMI: return "X86ISD::VPERMI";
20254 case X86ISD::VPTERNLOG: return "X86ISD::VPTERNLOG";
20255 case X86ISD::VFIXUPIMM: return "X86ISD::VFIXUPIMM";
20256 case X86ISD::VRANGE: return "X86ISD::VRANGE";
20257 case X86ISD::PMULUDQ: return "X86ISD::PMULUDQ";
20258 case X86ISD::PMULDQ: return "X86ISD::PMULDQ";
20259 case X86ISD::PSADBW: return "X86ISD::PSADBW";
20260 case X86ISD::DBPSADBW: return "X86ISD::DBPSADBW";
20261 case X86ISD::VASTART_SAVE_XMM_REGS: return "X86ISD::VASTART_SAVE_XMM_REGS";
20262 case X86ISD::VAARG_64: return "X86ISD::VAARG_64";
20263 case X86ISD::WIN_ALLOCA: return "X86ISD::WIN_ALLOCA";
20264 case X86ISD::MEMBARRIER: return "X86ISD::MEMBARRIER";
20265 case X86ISD::MFENCE: return "X86ISD::MFENCE";
20266 case X86ISD::SFENCE: return "X86ISD::SFENCE";
20267 case X86ISD::LFENCE: return "X86ISD::LFENCE";
20268 case X86ISD::SEG_ALLOCA: return "X86ISD::SEG_ALLOCA";
20269 case X86ISD::SAHF: return "X86ISD::SAHF";
20270 case X86ISD::RDRAND: return "X86ISD::RDRAND";
20271 case X86ISD::RDSEED: return "X86ISD::RDSEED";
20272 case X86ISD::VPMADDUBSW: return "X86ISD::VPMADDUBSW";
20273 case X86ISD::VPMADDWD: return "X86ISD::VPMADDWD";
20274 case X86ISD::VPROT: return "X86ISD::VPROT";
20275 case X86ISD::VPROTI: return "X86ISD::VPROTI";
20276 case X86ISD::VPSHA: return "X86ISD::VPSHA";
20277 case X86ISD::VPSHL: return "X86ISD::VPSHL";
20278 case X86ISD::VPCOM: return "X86ISD::VPCOM";
20279 case X86ISD::VPCOMU: return "X86ISD::VPCOMU";
20280 case X86ISD::FMADD: return "X86ISD::FMADD";
20281 case X86ISD::FMSUB: return "X86ISD::FMSUB";
20282 case X86ISD::FNMADD: return "X86ISD::FNMADD";
20283 case X86ISD::FNMSUB: return "X86ISD::FNMSUB";
20284 case X86ISD::FMADDSUB: return "X86ISD::FMADDSUB";
20285 case X86ISD::FMSUBADD: return "X86ISD::FMSUBADD";
20286 case X86ISD::FMADD_RND: return "X86ISD::FMADD_RND";
20287 case X86ISD::FNMADD_RND: return "X86ISD::FNMADD_RND";
20288 case X86ISD::FMSUB_RND: return "X86ISD::FMSUB_RND";
20289 case X86ISD::FNMSUB_RND: return "X86ISD::FNMSUB_RND";
20290 case X86ISD::FMADDSUB_RND: return "X86ISD::FMADDSUB_RND";
20291 case X86ISD::FMSUBADD_RND: return "X86ISD::FMSUBADD_RND";
20292 case X86ISD::VRNDSCALE: return "X86ISD::VRNDSCALE";
20293 case X86ISD::VREDUCE: return "X86ISD::VREDUCE";
20294 case X86ISD::VGETMANT: return "X86ISD::VGETMANT";
20295 case X86ISD::PCMPESTRI: return "X86ISD::PCMPESTRI";
20296 case X86ISD::PCMPISTRI: return "X86ISD::PCMPISTRI";
20297 case X86ISD::XTEST: return "X86ISD::XTEST";
20298 case X86ISD::COMPRESS: return "X86ISD::COMPRESS";
20299 case X86ISD::EXPAND: return "X86ISD::EXPAND";
20300 case X86ISD::SELECT: return "X86ISD::SELECT";
20301 case X86ISD::ADDSUB: return "X86ISD::ADDSUB";
20302 case X86ISD::RCP28: return "X86ISD::RCP28";
20303 case X86ISD::EXP2: return "X86ISD::EXP2";
20304 case X86ISD::RSQRT28: return "X86ISD::RSQRT28";
20305 case X86ISD::FADD_RND: return "X86ISD::FADD_RND";
20306 case X86ISD::FSUB_RND: return "X86ISD::FSUB_RND";
20307 case X86ISD::FMUL_RND: return "X86ISD::FMUL_RND";
20308 case X86ISD::FDIV_RND: return "X86ISD::FDIV_RND";
20309 case X86ISD::FSQRT_RND: return "X86ISD::FSQRT_RND";
20310 case X86ISD::FGETEXP_RND: return "X86ISD::FGETEXP_RND";
20311 case X86ISD::SCALEF: return "X86ISD::SCALEF";
20312 case X86ISD::ADDS: return "X86ISD::ADDS";
20313 case X86ISD::SUBS: return "X86ISD::SUBS";
20314 case X86ISD::AVG: return "X86ISD::AVG";
20315 case X86ISD::MULHRS: return "X86ISD::MULHRS";
20316 case X86ISD::SINT_TO_FP_RND: return "X86ISD::SINT_TO_FP_RND";
20317 case X86ISD::UINT_TO_FP_RND: return "X86ISD::UINT_TO_FP_RND";
20318 case X86ISD::FP_TO_SINT_RND: return "X86ISD::FP_TO_SINT_RND";
20319 case X86ISD::FP_TO_UINT_RND: return "X86ISD::FP_TO_UINT_RND";
20320 case X86ISD::VFPCLASS: return "X86ISD::VFPCLASS";
20321 case X86ISD::VFPCLASSS: return "X86ISD::VFPCLASSS";
20326 // isLegalAddressingMode - Return true if the addressing mode represented
20327 // by AM is legal for this target, for a load/store of the specified type.
20328 bool X86TargetLowering::isLegalAddressingMode(const DataLayout &DL,
20329 const AddrMode &AM, Type *Ty,
20330 unsigned AS) const {
20331 // X86 supports extremely general addressing modes.
20332 CodeModel::Model M = getTargetMachine().getCodeModel();
20333 Reloc::Model R = getTargetMachine().getRelocationModel();
20335 // X86 allows a sign-extended 32-bit immediate field as a displacement.
20336 if (!X86::isOffsetSuitableForCodeModel(AM.BaseOffs, M, AM.BaseGV != nullptr))
20341 Subtarget->ClassifyGlobalReference(AM.BaseGV, getTargetMachine());
20343 // If a reference to this global requires an extra load, we can't fold it.
20344 if (isGlobalStubReference(GVFlags))
20347 // If BaseGV requires a register for the PIC base, we cannot also have a
20348 // BaseReg specified.
20349 if (AM.HasBaseReg && isGlobalRelativeToPICBase(GVFlags))
20352 // If lower 4G is not available, then we must use rip-relative addressing.
20353 if ((M != CodeModel::Small || R != Reloc::Static) &&
20354 Subtarget->is64Bit() && (AM.BaseOffs || AM.Scale > 1))
20358 switch (AM.Scale) {
20364 // These scales always work.
20369 // These scales are formed with basereg+scalereg. Only accept if there is
20374 default: // Other stuff never works.
20381 bool X86TargetLowering::isVectorShiftByScalarCheap(Type *Ty) const {
20382 unsigned Bits = Ty->getScalarSizeInBits();
20384 // 8-bit shifts are always expensive, but versions with a scalar amount aren't
20385 // particularly cheaper than those without.
20389 // On AVX2 there are new vpsllv[dq] instructions (and other shifts), that make
20390 // variable shifts just as cheap as scalar ones.
20391 if (Subtarget->hasInt256() && (Bits == 32 || Bits == 64))
20394 // Otherwise, it's significantly cheaper to shift by a scalar amount than by a
20395 // fully general vector.
20399 bool X86TargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const {
20400 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
20402 unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
20403 unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
20404 return NumBits1 > NumBits2;
20407 bool X86TargetLowering::allowTruncateForTailCall(Type *Ty1, Type *Ty2) const {
20408 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
20411 if (!isTypeLegal(EVT::getEVT(Ty1)))
20414 assert(Ty1->getPrimitiveSizeInBits() <= 64 && "i128 is probably not a noop");
20416 // Assuming the caller doesn't have a zeroext or signext return parameter,
20417 // truncation all the way down to i1 is valid.
20421 bool X86TargetLowering::isLegalICmpImmediate(int64_t Imm) const {
20422 return isInt<32>(Imm);
20425 bool X86TargetLowering::isLegalAddImmediate(int64_t Imm) const {
20426 // Can also use sub to handle negated immediates.
20427 return isInt<32>(Imm);
20430 bool X86TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
20431 if (!VT1.isInteger() || !VT2.isInteger())
20433 unsigned NumBits1 = VT1.getSizeInBits();
20434 unsigned NumBits2 = VT2.getSizeInBits();
20435 return NumBits1 > NumBits2;
20438 bool X86TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const {
20439 // x86-64 implicitly zero-extends 32-bit results in 64-bit registers.
20440 return Ty1->isIntegerTy(32) && Ty2->isIntegerTy(64) && Subtarget->is64Bit();
20443 bool X86TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
20444 // x86-64 implicitly zero-extends 32-bit results in 64-bit registers.
20445 return VT1 == MVT::i32 && VT2 == MVT::i64 && Subtarget->is64Bit();
20448 bool X86TargetLowering::isZExtFree(SDValue Val, EVT VT2) const {
20449 EVT VT1 = Val.getValueType();
20450 if (isZExtFree(VT1, VT2))
20453 if (Val.getOpcode() != ISD::LOAD)
20456 if (!VT1.isSimple() || !VT1.isInteger() ||
20457 !VT2.isSimple() || !VT2.isInteger())
20460 switch (VT1.getSimpleVT().SimpleTy) {
20465 // X86 has 8, 16, and 32-bit zero-extending loads.
20472 bool X86TargetLowering::isVectorLoadExtDesirable(SDValue) const { return true; }
20475 X86TargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const {
20476 if (!Subtarget->hasAnyFMA())
20479 VT = VT.getScalarType();
20481 if (!VT.isSimple())
20484 switch (VT.getSimpleVT().SimpleTy) {
20495 bool X86TargetLowering::isNarrowingProfitable(EVT VT1, EVT VT2) const {
20496 // i16 instructions are longer (0x66 prefix) and potentially slower.
20497 return !(VT1 == MVT::i32 && VT2 == MVT::i16);
20500 /// isShuffleMaskLegal - Targets can use this to indicate that they only
20501 /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
20502 /// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
20503 /// are assumed to be legal.
20505 X86TargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
20507 if (!VT.isSimple())
20510 // Not for i1 vectors
20511 if (VT.getSimpleVT().getScalarType() == MVT::i1)
20514 // Very little shuffling can be done for 64-bit vectors right now.
20515 if (VT.getSimpleVT().getSizeInBits() == 64)
20518 // We only care that the types being shuffled are legal. The lowering can
20519 // handle any possible shuffle mask that results.
20520 return isTypeLegal(VT.getSimpleVT());
20524 X86TargetLowering::isVectorClearMaskLegal(const SmallVectorImpl<int> &Mask,
20526 // Just delegate to the generic legality, clear masks aren't special.
20527 return isShuffleMaskLegal(Mask, VT);
20530 //===----------------------------------------------------------------------===//
20531 // X86 Scheduler Hooks
20532 //===----------------------------------------------------------------------===//
20534 /// Utility function to emit xbegin specifying the start of an RTM region.
20535 static MachineBasicBlock *EmitXBegin(MachineInstr *MI, MachineBasicBlock *MBB,
20536 const TargetInstrInfo *TII) {
20537 DebugLoc DL = MI->getDebugLoc();
20539 const BasicBlock *BB = MBB->getBasicBlock();
20540 MachineFunction::iterator I = ++MBB->getIterator();
20542 // For the v = xbegin(), we generate
20553 MachineBasicBlock *thisMBB = MBB;
20554 MachineFunction *MF = MBB->getParent();
20555 MachineBasicBlock *mainMBB = MF->CreateMachineBasicBlock(BB);
20556 MachineBasicBlock *sinkMBB = MF->CreateMachineBasicBlock(BB);
20557 MF->insert(I, mainMBB);
20558 MF->insert(I, sinkMBB);
20560 // Transfer the remainder of BB and its successor edges to sinkMBB.
20561 sinkMBB->splice(sinkMBB->begin(), MBB,
20562 std::next(MachineBasicBlock::iterator(MI)), MBB->end());
20563 sinkMBB->transferSuccessorsAndUpdatePHIs(MBB);
20567 // # fallthrough to mainMBB
20568 // # abortion to sinkMBB
20569 BuildMI(thisMBB, DL, TII->get(X86::XBEGIN_4)).addMBB(sinkMBB);
20570 thisMBB->addSuccessor(mainMBB);
20571 thisMBB->addSuccessor(sinkMBB);
20575 BuildMI(mainMBB, DL, TII->get(X86::MOV32ri), X86::EAX).addImm(-1);
20576 mainMBB->addSuccessor(sinkMBB);
20579 // EAX is live into the sinkMBB
20580 sinkMBB->addLiveIn(X86::EAX);
20581 BuildMI(*sinkMBB, sinkMBB->begin(), DL,
20582 TII->get(TargetOpcode::COPY), MI->getOperand(0).getReg())
20585 MI->eraseFromParent();
20589 // FIXME: When we get size specific XMM0 registers, i.e. XMM0_V16I8
20590 // or XMM0_V32I8 in AVX all of this code can be replaced with that
20591 // in the .td file.
20592 static MachineBasicBlock *EmitPCMPSTRM(MachineInstr *MI, MachineBasicBlock *BB,
20593 const TargetInstrInfo *TII) {
20595 switch (MI->getOpcode()) {
20596 default: llvm_unreachable("illegal opcode!");
20597 case X86::PCMPISTRM128REG: Opc = X86::PCMPISTRM128rr; break;
20598 case X86::VPCMPISTRM128REG: Opc = X86::VPCMPISTRM128rr; break;
20599 case X86::PCMPISTRM128MEM: Opc = X86::PCMPISTRM128rm; break;
20600 case X86::VPCMPISTRM128MEM: Opc = X86::VPCMPISTRM128rm; break;
20601 case X86::PCMPESTRM128REG: Opc = X86::PCMPESTRM128rr; break;
20602 case X86::VPCMPESTRM128REG: Opc = X86::VPCMPESTRM128rr; break;
20603 case X86::PCMPESTRM128MEM: Opc = X86::PCMPESTRM128rm; break;
20604 case X86::VPCMPESTRM128MEM: Opc = X86::VPCMPESTRM128rm; break;
20607 DebugLoc dl = MI->getDebugLoc();
20608 MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(Opc));
20610 unsigned NumArgs = MI->getNumOperands();
20611 for (unsigned i = 1; i < NumArgs; ++i) {
20612 MachineOperand &Op = MI->getOperand(i);
20613 if (!(Op.isReg() && Op.isImplicit()))
20614 MIB.addOperand(Op);
20616 if (MI->hasOneMemOperand())
20617 MIB->setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
20619 BuildMI(*BB, MI, dl,
20620 TII->get(TargetOpcode::COPY), MI->getOperand(0).getReg())
20621 .addReg(X86::XMM0);
20623 MI->eraseFromParent();
20627 // FIXME: Custom handling because TableGen doesn't support multiple implicit
20628 // defs in an instruction pattern
20629 static MachineBasicBlock *EmitPCMPSTRI(MachineInstr *MI, MachineBasicBlock *BB,
20630 const TargetInstrInfo *TII) {
20632 switch (MI->getOpcode()) {
20633 default: llvm_unreachable("illegal opcode!");
20634 case X86::PCMPISTRIREG: Opc = X86::PCMPISTRIrr; break;
20635 case X86::VPCMPISTRIREG: Opc = X86::VPCMPISTRIrr; break;
20636 case X86::PCMPISTRIMEM: Opc = X86::PCMPISTRIrm; break;
20637 case X86::VPCMPISTRIMEM: Opc = X86::VPCMPISTRIrm; break;
20638 case X86::PCMPESTRIREG: Opc = X86::PCMPESTRIrr; break;
20639 case X86::VPCMPESTRIREG: Opc = X86::VPCMPESTRIrr; break;
20640 case X86::PCMPESTRIMEM: Opc = X86::PCMPESTRIrm; break;
20641 case X86::VPCMPESTRIMEM: Opc = X86::VPCMPESTRIrm; break;
20644 DebugLoc dl = MI->getDebugLoc();
20645 MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(Opc));
20647 unsigned NumArgs = MI->getNumOperands(); // remove the results
20648 for (unsigned i = 1; i < NumArgs; ++i) {
20649 MachineOperand &Op = MI->getOperand(i);
20650 if (!(Op.isReg() && Op.isImplicit()))
20651 MIB.addOperand(Op);
20653 if (MI->hasOneMemOperand())
20654 MIB->setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
20656 BuildMI(*BB, MI, dl,
20657 TII->get(TargetOpcode::COPY), MI->getOperand(0).getReg())
20660 MI->eraseFromParent();
20664 static MachineBasicBlock *EmitMonitor(MachineInstr *MI, MachineBasicBlock *BB,
20665 const X86Subtarget *Subtarget) {
20666 DebugLoc dl = MI->getDebugLoc();
20667 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
20668 // Address into RAX/EAX, other two args into ECX, EDX.
20669 unsigned MemOpc = Subtarget->is64Bit() ? X86::LEA64r : X86::LEA32r;
20670 unsigned MemReg = Subtarget->is64Bit() ? X86::RAX : X86::EAX;
20671 MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(MemOpc), MemReg);
20672 for (int i = 0; i < X86::AddrNumOperands; ++i)
20673 MIB.addOperand(MI->getOperand(i));
20675 unsigned ValOps = X86::AddrNumOperands;
20676 BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), X86::ECX)
20677 .addReg(MI->getOperand(ValOps).getReg());
20678 BuildMI(*BB, MI, dl, TII->get(TargetOpcode::COPY), X86::EDX)
20679 .addReg(MI->getOperand(ValOps+1).getReg());
20681 // The instruction doesn't actually take any operands though.
20682 BuildMI(*BB, MI, dl, TII->get(X86::MONITORrrr));
20684 MI->eraseFromParent(); // The pseudo is gone now.
20688 MachineBasicBlock *
20689 X86TargetLowering::EmitVAARG64WithCustomInserter(MachineInstr *MI,
20690 MachineBasicBlock *MBB) const {
20691 // Emit va_arg instruction on X86-64.
20693 // Operands to this pseudo-instruction:
20694 // 0 ) Output : destination address (reg)
20695 // 1-5) Input : va_list address (addr, i64mem)
20696 // 6 ) ArgSize : Size (in bytes) of vararg type
20697 // 7 ) ArgMode : 0=overflow only, 1=use gp_offset, 2=use fp_offset
20698 // 8 ) Align : Alignment of type
20699 // 9 ) EFLAGS (implicit-def)
20701 assert(MI->getNumOperands() == 10 && "VAARG_64 should have 10 operands!");
20702 static_assert(X86::AddrNumOperands == 5,
20703 "VAARG_64 assumes 5 address operands");
20705 unsigned DestReg = MI->getOperand(0).getReg();
20706 MachineOperand &Base = MI->getOperand(1);
20707 MachineOperand &Scale = MI->getOperand(2);
20708 MachineOperand &Index = MI->getOperand(3);
20709 MachineOperand &Disp = MI->getOperand(4);
20710 MachineOperand &Segment = MI->getOperand(5);
20711 unsigned ArgSize = MI->getOperand(6).getImm();
20712 unsigned ArgMode = MI->getOperand(7).getImm();
20713 unsigned Align = MI->getOperand(8).getImm();
20715 // Memory Reference
20716 assert(MI->hasOneMemOperand() && "Expected VAARG_64 to have one memoperand");
20717 MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
20718 MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
20720 // Machine Information
20721 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
20722 MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
20723 const TargetRegisterClass *AddrRegClass = getRegClassFor(MVT::i64);
20724 const TargetRegisterClass *OffsetRegClass = getRegClassFor(MVT::i32);
20725 DebugLoc DL = MI->getDebugLoc();
20727 // struct va_list {
20730 // i64 overflow_area (address)
20731 // i64 reg_save_area (address)
20733 // sizeof(va_list) = 24
20734 // alignment(va_list) = 8
20736 unsigned TotalNumIntRegs = 6;
20737 unsigned TotalNumXMMRegs = 8;
20738 bool UseGPOffset = (ArgMode == 1);
20739 bool UseFPOffset = (ArgMode == 2);
20740 unsigned MaxOffset = TotalNumIntRegs * 8 +
20741 (UseFPOffset ? TotalNumXMMRegs * 16 : 0);
20743 /* Align ArgSize to a multiple of 8 */
20744 unsigned ArgSizeA8 = (ArgSize + 7) & ~7;
20745 bool NeedsAlign = (Align > 8);
20747 MachineBasicBlock *thisMBB = MBB;
20748 MachineBasicBlock *overflowMBB;
20749 MachineBasicBlock *offsetMBB;
20750 MachineBasicBlock *endMBB;
20752 unsigned OffsetDestReg = 0; // Argument address computed by offsetMBB
20753 unsigned OverflowDestReg = 0; // Argument address computed by overflowMBB
20754 unsigned OffsetReg = 0;
20756 if (!UseGPOffset && !UseFPOffset) {
20757 // If we only pull from the overflow region, we don't create a branch.
20758 // We don't need to alter control flow.
20759 OffsetDestReg = 0; // unused
20760 OverflowDestReg = DestReg;
20762 offsetMBB = nullptr;
20763 overflowMBB = thisMBB;
20766 // First emit code to check if gp_offset (or fp_offset) is below the bound.
20767 // If so, pull the argument from reg_save_area. (branch to offsetMBB)
20768 // If not, pull from overflow_area. (branch to overflowMBB)
20773 // offsetMBB overflowMBB
20778 // Registers for the PHI in endMBB
20779 OffsetDestReg = MRI.createVirtualRegister(AddrRegClass);
20780 OverflowDestReg = MRI.createVirtualRegister(AddrRegClass);
20782 const BasicBlock *LLVM_BB = MBB->getBasicBlock();
20783 MachineFunction *MF = MBB->getParent();
20784 overflowMBB = MF->CreateMachineBasicBlock(LLVM_BB);
20785 offsetMBB = MF->CreateMachineBasicBlock(LLVM_BB);
20786 endMBB = MF->CreateMachineBasicBlock(LLVM_BB);
20788 MachineFunction::iterator MBBIter = ++MBB->getIterator();
20790 // Insert the new basic blocks
20791 MF->insert(MBBIter, offsetMBB);
20792 MF->insert(MBBIter, overflowMBB);
20793 MF->insert(MBBIter, endMBB);
20795 // Transfer the remainder of MBB and its successor edges to endMBB.
20796 endMBB->splice(endMBB->begin(), thisMBB,
20797 std::next(MachineBasicBlock::iterator(MI)), thisMBB->end());
20798 endMBB->transferSuccessorsAndUpdatePHIs(thisMBB);
20800 // Make offsetMBB and overflowMBB successors of thisMBB
20801 thisMBB->addSuccessor(offsetMBB);
20802 thisMBB->addSuccessor(overflowMBB);
20804 // endMBB is a successor of both offsetMBB and overflowMBB
20805 offsetMBB->addSuccessor(endMBB);
20806 overflowMBB->addSuccessor(endMBB);
20808 // Load the offset value into a register
20809 OffsetReg = MRI.createVirtualRegister(OffsetRegClass);
20810 BuildMI(thisMBB, DL, TII->get(X86::MOV32rm), OffsetReg)
20814 .addDisp(Disp, UseFPOffset ? 4 : 0)
20815 .addOperand(Segment)
20816 .setMemRefs(MMOBegin, MMOEnd);
20818 // Check if there is enough room left to pull this argument.
20819 BuildMI(thisMBB, DL, TII->get(X86::CMP32ri))
20821 .addImm(MaxOffset + 8 - ArgSizeA8);
20823 // Branch to "overflowMBB" if offset >= max
20824 // Fall through to "offsetMBB" otherwise
20825 BuildMI(thisMBB, DL, TII->get(X86::GetCondBranchFromCond(X86::COND_AE)))
20826 .addMBB(overflowMBB);
20829 // In offsetMBB, emit code to use the reg_save_area.
20831 assert(OffsetReg != 0);
20833 // Read the reg_save_area address.
20834 unsigned RegSaveReg = MRI.createVirtualRegister(AddrRegClass);
20835 BuildMI(offsetMBB, DL, TII->get(X86::MOV64rm), RegSaveReg)
20840 .addOperand(Segment)
20841 .setMemRefs(MMOBegin, MMOEnd);
20843 // Zero-extend the offset
20844 unsigned OffsetReg64 = MRI.createVirtualRegister(AddrRegClass);
20845 BuildMI(offsetMBB, DL, TII->get(X86::SUBREG_TO_REG), OffsetReg64)
20848 .addImm(X86::sub_32bit);
20850 // Add the offset to the reg_save_area to get the final address.
20851 BuildMI(offsetMBB, DL, TII->get(X86::ADD64rr), OffsetDestReg)
20852 .addReg(OffsetReg64)
20853 .addReg(RegSaveReg);
20855 // Compute the offset for the next argument
20856 unsigned NextOffsetReg = MRI.createVirtualRegister(OffsetRegClass);
20857 BuildMI(offsetMBB, DL, TII->get(X86::ADD32ri), NextOffsetReg)
20859 .addImm(UseFPOffset ? 16 : 8);
20861 // Store it back into the va_list.
20862 BuildMI(offsetMBB, DL, TII->get(X86::MOV32mr))
20866 .addDisp(Disp, UseFPOffset ? 4 : 0)
20867 .addOperand(Segment)
20868 .addReg(NextOffsetReg)
20869 .setMemRefs(MMOBegin, MMOEnd);
20872 BuildMI(offsetMBB, DL, TII->get(X86::JMP_1))
20877 // Emit code to use overflow area
20880 // Load the overflow_area address into a register.
20881 unsigned OverflowAddrReg = MRI.createVirtualRegister(AddrRegClass);
20882 BuildMI(overflowMBB, DL, TII->get(X86::MOV64rm), OverflowAddrReg)
20887 .addOperand(Segment)
20888 .setMemRefs(MMOBegin, MMOEnd);
20890 // If we need to align it, do so. Otherwise, just copy the address
20891 // to OverflowDestReg.
20893 // Align the overflow address
20894 assert((Align & (Align-1)) == 0 && "Alignment must be a power of 2");
20895 unsigned TmpReg = MRI.createVirtualRegister(AddrRegClass);
20897 // aligned_addr = (addr + (align-1)) & ~(align-1)
20898 BuildMI(overflowMBB, DL, TII->get(X86::ADD64ri32), TmpReg)
20899 .addReg(OverflowAddrReg)
20902 BuildMI(overflowMBB, DL, TII->get(X86::AND64ri32), OverflowDestReg)
20904 .addImm(~(uint64_t)(Align-1));
20906 BuildMI(overflowMBB, DL, TII->get(TargetOpcode::COPY), OverflowDestReg)
20907 .addReg(OverflowAddrReg);
20910 // Compute the next overflow address after this argument.
20911 // (the overflow address should be kept 8-byte aligned)
20912 unsigned NextAddrReg = MRI.createVirtualRegister(AddrRegClass);
20913 BuildMI(overflowMBB, DL, TII->get(X86::ADD64ri32), NextAddrReg)
20914 .addReg(OverflowDestReg)
20915 .addImm(ArgSizeA8);
20917 // Store the new overflow address.
20918 BuildMI(overflowMBB, DL, TII->get(X86::MOV64mr))
20923 .addOperand(Segment)
20924 .addReg(NextAddrReg)
20925 .setMemRefs(MMOBegin, MMOEnd);
20927 // If we branched, emit the PHI to the front of endMBB.
20929 BuildMI(*endMBB, endMBB->begin(), DL,
20930 TII->get(X86::PHI), DestReg)
20931 .addReg(OffsetDestReg).addMBB(offsetMBB)
20932 .addReg(OverflowDestReg).addMBB(overflowMBB);
20935 // Erase the pseudo instruction
20936 MI->eraseFromParent();
20941 MachineBasicBlock *
20942 X86TargetLowering::EmitVAStartSaveXMMRegsWithCustomInserter(
20944 MachineBasicBlock *MBB) const {
20945 // Emit code to save XMM registers to the stack. The ABI says that the
20946 // number of registers to save is given in %al, so it's theoretically
20947 // possible to do an indirect jump trick to avoid saving all of them,
20948 // however this code takes a simpler approach and just executes all
20949 // of the stores if %al is non-zero. It's less code, and it's probably
20950 // easier on the hardware branch predictor, and stores aren't all that
20951 // expensive anyway.
20953 // Create the new basic blocks. One block contains all the XMM stores,
20954 // and one block is the final destination regardless of whether any
20955 // stores were performed.
20956 const BasicBlock *LLVM_BB = MBB->getBasicBlock();
20957 MachineFunction *F = MBB->getParent();
20958 MachineFunction::iterator MBBIter = ++MBB->getIterator();
20959 MachineBasicBlock *XMMSaveMBB = F->CreateMachineBasicBlock(LLVM_BB);
20960 MachineBasicBlock *EndMBB = F->CreateMachineBasicBlock(LLVM_BB);
20961 F->insert(MBBIter, XMMSaveMBB);
20962 F->insert(MBBIter, EndMBB);
20964 // Transfer the remainder of MBB and its successor edges to EndMBB.
20965 EndMBB->splice(EndMBB->begin(), MBB,
20966 std::next(MachineBasicBlock::iterator(MI)), MBB->end());
20967 EndMBB->transferSuccessorsAndUpdatePHIs(MBB);
20969 // The original block will now fall through to the XMM save block.
20970 MBB->addSuccessor(XMMSaveMBB);
20971 // The XMMSaveMBB will fall through to the end block.
20972 XMMSaveMBB->addSuccessor(EndMBB);
20974 // Now add the instructions.
20975 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
20976 DebugLoc DL = MI->getDebugLoc();
20978 unsigned CountReg = MI->getOperand(0).getReg();
20979 int64_t RegSaveFrameIndex = MI->getOperand(1).getImm();
20980 int64_t VarArgsFPOffset = MI->getOperand(2).getImm();
20982 if (!Subtarget->isCallingConvWin64(F->getFunction()->getCallingConv())) {
20983 // If %al is 0, branch around the XMM save block.
20984 BuildMI(MBB, DL, TII->get(X86::TEST8rr)).addReg(CountReg).addReg(CountReg);
20985 BuildMI(MBB, DL, TII->get(X86::JE_1)).addMBB(EndMBB);
20986 MBB->addSuccessor(EndMBB);
20989 // Make sure the last operand is EFLAGS, which gets clobbered by the branch
20990 // that was just emitted, but clearly shouldn't be "saved".
20991 assert((MI->getNumOperands() <= 3 ||
20992 !MI->getOperand(MI->getNumOperands() - 1).isReg() ||
20993 MI->getOperand(MI->getNumOperands() - 1).getReg() == X86::EFLAGS)
20994 && "Expected last argument to be EFLAGS");
20995 unsigned MOVOpc = Subtarget->hasFp256() ? X86::VMOVAPSmr : X86::MOVAPSmr;
20996 // In the XMM save block, save all the XMM argument registers.
20997 for (int i = 3, e = MI->getNumOperands() - 1; i != e; ++i) {
20998 int64_t Offset = (i - 3) * 16 + VarArgsFPOffset;
20999 MachineMemOperand *MMO = F->getMachineMemOperand(
21000 MachinePointerInfo::getFixedStack(*F, RegSaveFrameIndex, Offset),
21001 MachineMemOperand::MOStore,
21002 /*Size=*/16, /*Align=*/16);
21003 BuildMI(XMMSaveMBB, DL, TII->get(MOVOpc))
21004 .addFrameIndex(RegSaveFrameIndex)
21005 .addImm(/*Scale=*/1)
21006 .addReg(/*IndexReg=*/0)
21007 .addImm(/*Disp=*/Offset)
21008 .addReg(/*Segment=*/0)
21009 .addReg(MI->getOperand(i).getReg())
21010 .addMemOperand(MMO);
21013 MI->eraseFromParent(); // The pseudo instruction is gone now.
21018 // The EFLAGS operand of SelectItr might be missing a kill marker
21019 // because there were multiple uses of EFLAGS, and ISel didn't know
21020 // which to mark. Figure out whether SelectItr should have had a
21021 // kill marker, and set it if it should. Returns the correct kill
21023 static bool checkAndUpdateEFLAGSKill(MachineBasicBlock::iterator SelectItr,
21024 MachineBasicBlock* BB,
21025 const TargetRegisterInfo* TRI) {
21026 // Scan forward through BB for a use/def of EFLAGS.
21027 MachineBasicBlock::iterator miI(std::next(SelectItr));
21028 for (MachineBasicBlock::iterator miE = BB->end(); miI != miE; ++miI) {
21029 const MachineInstr& mi = *miI;
21030 if (mi.readsRegister(X86::EFLAGS))
21032 if (mi.definesRegister(X86::EFLAGS))
21033 break; // Should have kill-flag - update below.
21036 // If we hit the end of the block, check whether EFLAGS is live into a
21038 if (miI == BB->end()) {
21039 for (MachineBasicBlock::succ_iterator sItr = BB->succ_begin(),
21040 sEnd = BB->succ_end();
21041 sItr != sEnd; ++sItr) {
21042 MachineBasicBlock* succ = *sItr;
21043 if (succ->isLiveIn(X86::EFLAGS))
21048 // We found a def, or hit the end of the basic block and EFLAGS wasn't live
21049 // out. SelectMI should have a kill flag on EFLAGS.
21050 SelectItr->addRegisterKilled(X86::EFLAGS, TRI);
21054 // Return true if it is OK for this CMOV pseudo-opcode to be cascaded
21055 // together with other CMOV pseudo-opcodes into a single basic-block with
21056 // conditional jump around it.
21057 static bool isCMOVPseudo(MachineInstr *MI) {
21058 switch (MI->getOpcode()) {
21059 case X86::CMOV_FR32:
21060 case X86::CMOV_FR64:
21061 case X86::CMOV_GR8:
21062 case X86::CMOV_GR16:
21063 case X86::CMOV_GR32:
21064 case X86::CMOV_RFP32:
21065 case X86::CMOV_RFP64:
21066 case X86::CMOV_RFP80:
21067 case X86::CMOV_V2F64:
21068 case X86::CMOV_V2I64:
21069 case X86::CMOV_V4F32:
21070 case X86::CMOV_V4F64:
21071 case X86::CMOV_V4I64:
21072 case X86::CMOV_V16F32:
21073 case X86::CMOV_V8F32:
21074 case X86::CMOV_V8F64:
21075 case X86::CMOV_V8I64:
21076 case X86::CMOV_V8I1:
21077 case X86::CMOV_V16I1:
21078 case X86::CMOV_V32I1:
21079 case X86::CMOV_V64I1:
21087 MachineBasicBlock *
21088 X86TargetLowering::EmitLoweredSelect(MachineInstr *MI,
21089 MachineBasicBlock *BB) const {
21090 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
21091 DebugLoc DL = MI->getDebugLoc();
21093 // To "insert" a SELECT_CC instruction, we actually have to insert the
21094 // diamond control-flow pattern. The incoming instruction knows the
21095 // destination vreg to set, the condition code register to branch on, the
21096 // true/false values to select between, and a branch opcode to use.
21097 const BasicBlock *LLVM_BB = BB->getBasicBlock();
21098 MachineFunction::iterator It = ++BB->getIterator();
21103 // cmpTY ccX, r1, r2
21105 // fallthrough --> copy0MBB
21106 MachineBasicBlock *thisMBB = BB;
21107 MachineFunction *F = BB->getParent();
21109 // This code lowers all pseudo-CMOV instructions. Generally it lowers these
21110 // as described above, by inserting a BB, and then making a PHI at the join
21111 // point to select the true and false operands of the CMOV in the PHI.
21113 // The code also handles two different cases of multiple CMOV opcodes
21117 // In this case, there are multiple CMOVs in a row, all which are based on
21118 // the same condition setting (or the exact opposite condition setting).
21119 // In this case we can lower all the CMOVs using a single inserted BB, and
21120 // then make a number of PHIs at the join point to model the CMOVs. The only
21121 // trickiness here, is that in a case like:
21123 // t2 = CMOV cond1 t1, f1
21124 // t3 = CMOV cond1 t2, f2
21126 // when rewriting this into PHIs, we have to perform some renaming on the
21127 // temps since you cannot have a PHI operand refer to a PHI result earlier
21128 // in the same block. The "simple" but wrong lowering would be:
21130 // t2 = PHI t1(BB1), f1(BB2)
21131 // t3 = PHI t2(BB1), f2(BB2)
21133 // but clearly t2 is not defined in BB1, so that is incorrect. The proper
21134 // renaming is to note that on the path through BB1, t2 is really just a
21135 // copy of t1, and do that renaming, properly generating:
21137 // t2 = PHI t1(BB1), f1(BB2)
21138 // t3 = PHI t1(BB1), f2(BB2)
21140 // Case 2, we lower cascaded CMOVs such as
21142 // (CMOV (CMOV F, T, cc1), T, cc2)
21144 // to two successives branches. For that, we look for another CMOV as the
21145 // following instruction.
21147 // Without this, we would add a PHI between the two jumps, which ends up
21148 // creating a few copies all around. For instance, for
21150 // (sitofp (zext (fcmp une)))
21152 // we would generate:
21154 // ucomiss %xmm1, %xmm0
21155 // movss <1.0f>, %xmm0
21156 // movaps %xmm0, %xmm1
21158 // xorps %xmm1, %xmm1
21161 // movaps %xmm1, %xmm0
21165 // because this custom-inserter would have generated:
21177 // A: X = ...; Y = ...
21179 // C: Z = PHI [X, A], [Y, B]
21181 // E: PHI [X, C], [Z, D]
21183 // If we lower both CMOVs in a single step, we can instead generate:
21195 // A: X = ...; Y = ...
21197 // E: PHI [X, A], [X, C], [Y, D]
21199 // Which, in our sitofp/fcmp example, gives us something like:
21201 // ucomiss %xmm1, %xmm0
21202 // movss <1.0f>, %xmm0
21205 // xorps %xmm0, %xmm0
21209 MachineInstr *CascadedCMOV = nullptr;
21210 MachineInstr *LastCMOV = MI;
21211 X86::CondCode CC = X86::CondCode(MI->getOperand(3).getImm());
21212 X86::CondCode OppCC = X86::GetOppositeBranchCondition(CC);
21213 MachineBasicBlock::iterator NextMIIt =
21214 std::next(MachineBasicBlock::iterator(MI));
21216 // Check for case 1, where there are multiple CMOVs with the same condition
21217 // first. Of the two cases of multiple CMOV lowerings, case 1 reduces the
21218 // number of jumps the most.
21220 if (isCMOVPseudo(MI)) {
21221 // See if we have a string of CMOVS with the same condition.
21222 while (NextMIIt != BB->end() &&
21223 isCMOVPseudo(NextMIIt) &&
21224 (NextMIIt->getOperand(3).getImm() == CC ||
21225 NextMIIt->getOperand(3).getImm() == OppCC)) {
21226 LastCMOV = &*NextMIIt;
21231 // This checks for case 2, but only do this if we didn't already find
21232 // case 1, as indicated by LastCMOV == MI.
21233 if (LastCMOV == MI &&
21234 NextMIIt != BB->end() && NextMIIt->getOpcode() == MI->getOpcode() &&
21235 NextMIIt->getOperand(2).getReg() == MI->getOperand(2).getReg() &&
21236 NextMIIt->getOperand(1).getReg() == MI->getOperand(0).getReg()) {
21237 CascadedCMOV = &*NextMIIt;
21240 MachineBasicBlock *jcc1MBB = nullptr;
21242 // If we have a cascaded CMOV, we lower it to two successive branches to
21243 // the same block. EFLAGS is used by both, so mark it as live in the second.
21244 if (CascadedCMOV) {
21245 jcc1MBB = F->CreateMachineBasicBlock(LLVM_BB);
21246 F->insert(It, jcc1MBB);
21247 jcc1MBB->addLiveIn(X86::EFLAGS);
21250 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
21251 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
21252 F->insert(It, copy0MBB);
21253 F->insert(It, sinkMBB);
21255 // If the EFLAGS register isn't dead in the terminator, then claim that it's
21256 // live into the sink and copy blocks.
21257 const TargetRegisterInfo *TRI = Subtarget->getRegisterInfo();
21259 MachineInstr *LastEFLAGSUser = CascadedCMOV ? CascadedCMOV : LastCMOV;
21260 if (!LastEFLAGSUser->killsRegister(X86::EFLAGS) &&
21261 !checkAndUpdateEFLAGSKill(LastEFLAGSUser, BB, TRI)) {
21262 copy0MBB->addLiveIn(X86::EFLAGS);
21263 sinkMBB->addLiveIn(X86::EFLAGS);
21266 // Transfer the remainder of BB and its successor edges to sinkMBB.
21267 sinkMBB->splice(sinkMBB->begin(), BB,
21268 std::next(MachineBasicBlock::iterator(LastCMOV)), BB->end());
21269 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
21271 // Add the true and fallthrough blocks as its successors.
21272 if (CascadedCMOV) {
21273 // The fallthrough block may be jcc1MBB, if we have a cascaded CMOV.
21274 BB->addSuccessor(jcc1MBB);
21276 // In that case, jcc1MBB will itself fallthrough the copy0MBB, and
21277 // jump to the sinkMBB.
21278 jcc1MBB->addSuccessor(copy0MBB);
21279 jcc1MBB->addSuccessor(sinkMBB);
21281 BB->addSuccessor(copy0MBB);
21284 // The true block target of the first (or only) branch is always sinkMBB.
21285 BB->addSuccessor(sinkMBB);
21287 // Create the conditional branch instruction.
21288 unsigned Opc = X86::GetCondBranchFromCond(CC);
21289 BuildMI(BB, DL, TII->get(Opc)).addMBB(sinkMBB);
21291 if (CascadedCMOV) {
21292 unsigned Opc2 = X86::GetCondBranchFromCond(
21293 (X86::CondCode)CascadedCMOV->getOperand(3).getImm());
21294 BuildMI(jcc1MBB, DL, TII->get(Opc2)).addMBB(sinkMBB);
21298 // %FalseValue = ...
21299 // # fallthrough to sinkMBB
21300 copy0MBB->addSuccessor(sinkMBB);
21303 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
21305 MachineBasicBlock::iterator MIItBegin = MachineBasicBlock::iterator(MI);
21306 MachineBasicBlock::iterator MIItEnd =
21307 std::next(MachineBasicBlock::iterator(LastCMOV));
21308 MachineBasicBlock::iterator SinkInsertionPoint = sinkMBB->begin();
21309 DenseMap<unsigned, std::pair<unsigned, unsigned>> RegRewriteTable;
21310 MachineInstrBuilder MIB;
21312 // As we are creating the PHIs, we have to be careful if there is more than
21313 // one. Later CMOVs may reference the results of earlier CMOVs, but later
21314 // PHIs have to reference the individual true/false inputs from earlier PHIs.
21315 // That also means that PHI construction must work forward from earlier to
21316 // later, and that the code must maintain a mapping from earlier PHI's
21317 // destination registers, and the registers that went into the PHI.
21319 for (MachineBasicBlock::iterator MIIt = MIItBegin; MIIt != MIItEnd; ++MIIt) {
21320 unsigned DestReg = MIIt->getOperand(0).getReg();
21321 unsigned Op1Reg = MIIt->getOperand(1).getReg();
21322 unsigned Op2Reg = MIIt->getOperand(2).getReg();
21324 // If this CMOV we are generating is the opposite condition from
21325 // the jump we generated, then we have to swap the operands for the
21326 // PHI that is going to be generated.
21327 if (MIIt->getOperand(3).getImm() == OppCC)
21328 std::swap(Op1Reg, Op2Reg);
21330 if (RegRewriteTable.find(Op1Reg) != RegRewriteTable.end())
21331 Op1Reg = RegRewriteTable[Op1Reg].first;
21333 if (RegRewriteTable.find(Op2Reg) != RegRewriteTable.end())
21334 Op2Reg = RegRewriteTable[Op2Reg].second;
21336 MIB = BuildMI(*sinkMBB, SinkInsertionPoint, DL,
21337 TII->get(X86::PHI), DestReg)
21338 .addReg(Op1Reg).addMBB(copy0MBB)
21339 .addReg(Op2Reg).addMBB(thisMBB);
21341 // Add this PHI to the rewrite table.
21342 RegRewriteTable[DestReg] = std::make_pair(Op1Reg, Op2Reg);
21345 // If we have a cascaded CMOV, the second Jcc provides the same incoming
21346 // value as the first Jcc (the True operand of the SELECT_CC/CMOV nodes).
21347 if (CascadedCMOV) {
21348 MIB.addReg(MI->getOperand(2).getReg()).addMBB(jcc1MBB);
21349 // Copy the PHI result to the register defined by the second CMOV.
21350 BuildMI(*sinkMBB, std::next(MachineBasicBlock::iterator(MIB.getInstr())),
21351 DL, TII->get(TargetOpcode::COPY),
21352 CascadedCMOV->getOperand(0).getReg())
21353 .addReg(MI->getOperand(0).getReg());
21354 CascadedCMOV->eraseFromParent();
21357 // Now remove the CMOV(s).
21358 for (MachineBasicBlock::iterator MIIt = MIItBegin; MIIt != MIItEnd; )
21359 (MIIt++)->eraseFromParent();
21364 MachineBasicBlock *
21365 X86TargetLowering::EmitLoweredAtomicFP(MachineInstr *MI,
21366 MachineBasicBlock *BB) const {
21367 // Combine the following atomic floating-point modification pattern:
21368 // a.store(reg OP a.load(acquire), release)
21369 // Transform them into:
21370 // OPss (%gpr), %xmm
21371 // movss %xmm, (%gpr)
21372 // Or sd equivalent for 64-bit operations.
21374 switch (MI->getOpcode()) {
21375 default: llvm_unreachable("unexpected instr type for EmitLoweredAtomicFP");
21376 case X86::RELEASE_FADD32mr: MOp = X86::MOVSSmr; FOp = X86::ADDSSrm; break;
21377 case X86::RELEASE_FADD64mr: MOp = X86::MOVSDmr; FOp = X86::ADDSDrm; break;
21379 const X86InstrInfo *TII = Subtarget->getInstrInfo();
21380 DebugLoc DL = MI->getDebugLoc();
21381 MachineRegisterInfo &MRI = BB->getParent()->getRegInfo();
21382 MachineOperand MSrc = MI->getOperand(0);
21383 unsigned VSrc = MI->getOperand(5).getReg();
21384 const MachineOperand &Disp = MI->getOperand(3);
21385 MachineOperand ZeroDisp = MachineOperand::CreateImm(0);
21386 bool hasDisp = Disp.isGlobal() || Disp.isImm();
21387 if (hasDisp && MSrc.isReg())
21388 MSrc.setIsKill(false);
21389 MachineInstrBuilder MIM = BuildMI(*BB, MI, DL, TII->get(MOp))
21390 .addOperand(/*Base=*/MSrc)
21391 .addImm(/*Scale=*/1)
21392 .addReg(/*Index=*/0)
21393 .addDisp(hasDisp ? Disp : ZeroDisp, /*off=*/0)
21395 MachineInstr *MIO = BuildMI(*BB, (MachineInstr *)MIM, DL, TII->get(FOp),
21396 MRI.createVirtualRegister(MRI.getRegClass(VSrc)))
21398 .addOperand(/*Base=*/MSrc)
21399 .addImm(/*Scale=*/1)
21400 .addReg(/*Index=*/0)
21401 .addDisp(hasDisp ? Disp : ZeroDisp, /*off=*/0)
21402 .addReg(/*Segment=*/0);
21403 MIM.addReg(MIO->getOperand(0).getReg(), RegState::Kill);
21404 MI->eraseFromParent(); // The pseudo instruction is gone now.
21408 MachineBasicBlock *
21409 X86TargetLowering::EmitLoweredSegAlloca(MachineInstr *MI,
21410 MachineBasicBlock *BB) const {
21411 MachineFunction *MF = BB->getParent();
21412 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
21413 DebugLoc DL = MI->getDebugLoc();
21414 const BasicBlock *LLVM_BB = BB->getBasicBlock();
21416 assert(MF->shouldSplitStack());
21418 const bool Is64Bit = Subtarget->is64Bit();
21419 const bool IsLP64 = Subtarget->isTarget64BitLP64();
21421 const unsigned TlsReg = Is64Bit ? X86::FS : X86::GS;
21422 const unsigned TlsOffset = IsLP64 ? 0x70 : Is64Bit ? 0x40 : 0x30;
21425 // ... [Till the alloca]
21426 // If stacklet is not large enough, jump to mallocMBB
21429 // Allocate by subtracting from RSP
21430 // Jump to continueMBB
21433 // Allocate by call to runtime
21437 // [rest of original BB]
21440 MachineBasicBlock *mallocMBB = MF->CreateMachineBasicBlock(LLVM_BB);
21441 MachineBasicBlock *bumpMBB = MF->CreateMachineBasicBlock(LLVM_BB);
21442 MachineBasicBlock *continueMBB = MF->CreateMachineBasicBlock(LLVM_BB);
21444 MachineRegisterInfo &MRI = MF->getRegInfo();
21445 const TargetRegisterClass *AddrRegClass =
21446 getRegClassFor(getPointerTy(MF->getDataLayout()));
21448 unsigned mallocPtrVReg = MRI.createVirtualRegister(AddrRegClass),
21449 bumpSPPtrVReg = MRI.createVirtualRegister(AddrRegClass),
21450 tmpSPVReg = MRI.createVirtualRegister(AddrRegClass),
21451 SPLimitVReg = MRI.createVirtualRegister(AddrRegClass),
21452 sizeVReg = MI->getOperand(1).getReg(),
21453 physSPReg = IsLP64 || Subtarget->isTargetNaCl64() ? X86::RSP : X86::ESP;
21455 MachineFunction::iterator MBBIter = ++BB->getIterator();
21457 MF->insert(MBBIter, bumpMBB);
21458 MF->insert(MBBIter, mallocMBB);
21459 MF->insert(MBBIter, continueMBB);
21461 continueMBB->splice(continueMBB->begin(), BB,
21462 std::next(MachineBasicBlock::iterator(MI)), BB->end());
21463 continueMBB->transferSuccessorsAndUpdatePHIs(BB);
21465 // Add code to the main basic block to check if the stack limit has been hit,
21466 // and if so, jump to mallocMBB otherwise to bumpMBB.
21467 BuildMI(BB, DL, TII->get(TargetOpcode::COPY), tmpSPVReg).addReg(physSPReg);
21468 BuildMI(BB, DL, TII->get(IsLP64 ? X86::SUB64rr:X86::SUB32rr), SPLimitVReg)
21469 .addReg(tmpSPVReg).addReg(sizeVReg);
21470 BuildMI(BB, DL, TII->get(IsLP64 ? X86::CMP64mr:X86::CMP32mr))
21471 .addReg(0).addImm(1).addReg(0).addImm(TlsOffset).addReg(TlsReg)
21472 .addReg(SPLimitVReg);
21473 BuildMI(BB, DL, TII->get(X86::JG_1)).addMBB(mallocMBB);
21475 // bumpMBB simply decreases the stack pointer, since we know the current
21476 // stacklet has enough space.
21477 BuildMI(bumpMBB, DL, TII->get(TargetOpcode::COPY), physSPReg)
21478 .addReg(SPLimitVReg);
21479 BuildMI(bumpMBB, DL, TII->get(TargetOpcode::COPY), bumpSPPtrVReg)
21480 .addReg(SPLimitVReg);
21481 BuildMI(bumpMBB, DL, TII->get(X86::JMP_1)).addMBB(continueMBB);
21483 // Calls into a routine in libgcc to allocate more space from the heap.
21484 const uint32_t *RegMask =
21485 Subtarget->getRegisterInfo()->getCallPreservedMask(*MF, CallingConv::C);
21487 BuildMI(mallocMBB, DL, TII->get(X86::MOV64rr), X86::RDI)
21489 BuildMI(mallocMBB, DL, TII->get(X86::CALL64pcrel32))
21490 .addExternalSymbol("__morestack_allocate_stack_space")
21491 .addRegMask(RegMask)
21492 .addReg(X86::RDI, RegState::Implicit)
21493 .addReg(X86::RAX, RegState::ImplicitDefine);
21494 } else if (Is64Bit) {
21495 BuildMI(mallocMBB, DL, TII->get(X86::MOV32rr), X86::EDI)
21497 BuildMI(mallocMBB, DL, TII->get(X86::CALL64pcrel32))
21498 .addExternalSymbol("__morestack_allocate_stack_space")
21499 .addRegMask(RegMask)
21500 .addReg(X86::EDI, RegState::Implicit)
21501 .addReg(X86::EAX, RegState::ImplicitDefine);
21503 BuildMI(mallocMBB, DL, TII->get(X86::SUB32ri), physSPReg).addReg(physSPReg)
21505 BuildMI(mallocMBB, DL, TII->get(X86::PUSH32r)).addReg(sizeVReg);
21506 BuildMI(mallocMBB, DL, TII->get(X86::CALLpcrel32))
21507 .addExternalSymbol("__morestack_allocate_stack_space")
21508 .addRegMask(RegMask)
21509 .addReg(X86::EAX, RegState::ImplicitDefine);
21513 BuildMI(mallocMBB, DL, TII->get(X86::ADD32ri), physSPReg).addReg(physSPReg)
21516 BuildMI(mallocMBB, DL, TII->get(TargetOpcode::COPY), mallocPtrVReg)
21517 .addReg(IsLP64 ? X86::RAX : X86::EAX);
21518 BuildMI(mallocMBB, DL, TII->get(X86::JMP_1)).addMBB(continueMBB);
21520 // Set up the CFG correctly.
21521 BB->addSuccessor(bumpMBB);
21522 BB->addSuccessor(mallocMBB);
21523 mallocMBB->addSuccessor(continueMBB);
21524 bumpMBB->addSuccessor(continueMBB);
21526 // Take care of the PHI nodes.
21527 BuildMI(*continueMBB, continueMBB->begin(), DL, TII->get(X86::PHI),
21528 MI->getOperand(0).getReg())
21529 .addReg(mallocPtrVReg).addMBB(mallocMBB)
21530 .addReg(bumpSPPtrVReg).addMBB(bumpMBB);
21532 // Delete the original pseudo instruction.
21533 MI->eraseFromParent();
21536 return continueMBB;
21539 MachineBasicBlock *
21540 X86TargetLowering::EmitLoweredWinAlloca(MachineInstr *MI,
21541 MachineBasicBlock *BB) const {
21542 assert(!Subtarget->isTargetMachO());
21543 DebugLoc DL = MI->getDebugLoc();
21544 MachineInstr *ResumeMI = Subtarget->getFrameLowering()->emitStackProbe(
21545 *BB->getParent(), *BB, MI, DL, false);
21546 MachineBasicBlock *ResumeBB = ResumeMI->getParent();
21547 MI->eraseFromParent(); // The pseudo instruction is gone now.
21551 MachineBasicBlock *
21552 X86TargetLowering::EmitLoweredCatchRet(MachineInstr *MI,
21553 MachineBasicBlock *BB) const {
21554 MachineFunction *MF = BB->getParent();
21555 const TargetInstrInfo &TII = *Subtarget->getInstrInfo();
21556 MachineBasicBlock *TargetMBB = MI->getOperand(0).getMBB();
21557 DebugLoc DL = MI->getDebugLoc();
21559 assert(!isAsynchronousEHPersonality(
21560 classifyEHPersonality(MF->getFunction()->getPersonalityFn())) &&
21561 "SEH does not use catchret!");
21563 // Only 32-bit EH needs to worry about manually restoring stack pointers.
21564 if (!Subtarget->is32Bit())
21567 // C++ EH creates a new target block to hold the restore code, and wires up
21568 // the new block to the return destination with a normal JMP_4.
21569 MachineBasicBlock *RestoreMBB =
21570 MF->CreateMachineBasicBlock(BB->getBasicBlock());
21571 assert(BB->succ_size() == 1);
21572 MF->insert(std::next(BB->getIterator()), RestoreMBB);
21573 RestoreMBB->transferSuccessorsAndUpdatePHIs(BB);
21574 BB->addSuccessor(RestoreMBB);
21575 MI->getOperand(0).setMBB(RestoreMBB);
21577 auto RestoreMBBI = RestoreMBB->begin();
21578 BuildMI(*RestoreMBB, RestoreMBBI, DL, TII.get(X86::EH_RESTORE));
21579 BuildMI(*RestoreMBB, RestoreMBBI, DL, TII.get(X86::JMP_4)).addMBB(TargetMBB);
21583 MachineBasicBlock *
21584 X86TargetLowering::EmitLoweredCatchPad(MachineInstr *MI,
21585 MachineBasicBlock *BB) const {
21586 MachineFunction *MF = BB->getParent();
21587 const Constant *PerFn = MF->getFunction()->getPersonalityFn();
21588 bool IsSEH = isAsynchronousEHPersonality(classifyEHPersonality(PerFn));
21589 // Only 32-bit SEH requires special handling for catchpad.
21590 if (IsSEH && Subtarget->is32Bit()) {
21591 const TargetInstrInfo &TII = *Subtarget->getInstrInfo();
21592 DebugLoc DL = MI->getDebugLoc();
21593 BuildMI(*BB, MI, DL, TII.get(X86::EH_RESTORE));
21595 MI->eraseFromParent();
21599 MachineBasicBlock *
21600 X86TargetLowering::EmitLoweredTLSCall(MachineInstr *MI,
21601 MachineBasicBlock *BB) const {
21602 // This is pretty easy. We're taking the value that we received from
21603 // our load from the relocation, sticking it in either RDI (x86-64)
21604 // or EAX and doing an indirect call. The return value will then
21605 // be in the normal return register.
21606 MachineFunction *F = BB->getParent();
21607 const X86InstrInfo *TII = Subtarget->getInstrInfo();
21608 DebugLoc DL = MI->getDebugLoc();
21610 assert(Subtarget->isTargetDarwin() && "Darwin only instr emitted?");
21611 assert(MI->getOperand(3).isGlobal() && "This should be a global");
21613 // Get a register mask for the lowered call.
21614 // FIXME: The 32-bit calls have non-standard calling conventions. Use a
21615 // proper register mask.
21616 const uint32_t *RegMask =
21617 Subtarget->is64Bit() ?
21618 Subtarget->getRegisterInfo()->getDarwinTLSCallPreservedMask() :
21619 Subtarget->getRegisterInfo()->getCallPreservedMask(*F, CallingConv::C);
21620 if (Subtarget->is64Bit()) {
21621 MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
21622 TII->get(X86::MOV64rm), X86::RDI)
21624 .addImm(0).addReg(0)
21625 .addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
21626 MI->getOperand(3).getTargetFlags())
21628 MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL64m));
21629 addDirectMem(MIB, X86::RDI);
21630 MIB.addReg(X86::RAX, RegState::ImplicitDefine).addRegMask(RegMask);
21631 } else if (F->getTarget().getRelocationModel() != Reloc::PIC_) {
21632 MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
21633 TII->get(X86::MOV32rm), X86::EAX)
21635 .addImm(0).addReg(0)
21636 .addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
21637 MI->getOperand(3).getTargetFlags())
21639 MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL32m));
21640 addDirectMem(MIB, X86::EAX);
21641 MIB.addReg(X86::EAX, RegState::ImplicitDefine).addRegMask(RegMask);
21643 MachineInstrBuilder MIB = BuildMI(*BB, MI, DL,
21644 TII->get(X86::MOV32rm), X86::EAX)
21645 .addReg(TII->getGlobalBaseReg(F))
21646 .addImm(0).addReg(0)
21647 .addGlobalAddress(MI->getOperand(3).getGlobal(), 0,
21648 MI->getOperand(3).getTargetFlags())
21650 MIB = BuildMI(*BB, MI, DL, TII->get(X86::CALL32m));
21651 addDirectMem(MIB, X86::EAX);
21652 MIB.addReg(X86::EAX, RegState::ImplicitDefine).addRegMask(RegMask);
21655 MI->eraseFromParent(); // The pseudo instruction is gone now.
21659 MachineBasicBlock *
21660 X86TargetLowering::emitEHSjLjSetJmp(MachineInstr *MI,
21661 MachineBasicBlock *MBB) const {
21662 DebugLoc DL = MI->getDebugLoc();
21663 MachineFunction *MF = MBB->getParent();
21664 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
21665 MachineRegisterInfo &MRI = MF->getRegInfo();
21667 const BasicBlock *BB = MBB->getBasicBlock();
21668 MachineFunction::iterator I = ++MBB->getIterator();
21670 // Memory Reference
21671 MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
21672 MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
21675 unsigned MemOpndSlot = 0;
21677 unsigned CurOp = 0;
21679 DstReg = MI->getOperand(CurOp++).getReg();
21680 const TargetRegisterClass *RC = MRI.getRegClass(DstReg);
21681 assert(RC->hasType(MVT::i32) && "Invalid destination!");
21682 unsigned mainDstReg = MRI.createVirtualRegister(RC);
21683 unsigned restoreDstReg = MRI.createVirtualRegister(RC);
21685 MemOpndSlot = CurOp;
21687 MVT PVT = getPointerTy(MF->getDataLayout());
21688 assert((PVT == MVT::i64 || PVT == MVT::i32) &&
21689 "Invalid Pointer Size!");
21691 // For v = setjmp(buf), we generate
21694 // buf[LabelOffset] = restoreMBB <-- takes address of restoreMBB
21695 // SjLjSetup restoreMBB
21701 // v = phi(main, restore)
21704 // if base pointer being used, load it from frame
21707 MachineBasicBlock *thisMBB = MBB;
21708 MachineBasicBlock *mainMBB = MF->CreateMachineBasicBlock(BB);
21709 MachineBasicBlock *sinkMBB = MF->CreateMachineBasicBlock(BB);
21710 MachineBasicBlock *restoreMBB = MF->CreateMachineBasicBlock(BB);
21711 MF->insert(I, mainMBB);
21712 MF->insert(I, sinkMBB);
21713 MF->push_back(restoreMBB);
21714 restoreMBB->setHasAddressTaken();
21716 MachineInstrBuilder MIB;
21718 // Transfer the remainder of BB and its successor edges to sinkMBB.
21719 sinkMBB->splice(sinkMBB->begin(), MBB,
21720 std::next(MachineBasicBlock::iterator(MI)), MBB->end());
21721 sinkMBB->transferSuccessorsAndUpdatePHIs(MBB);
21724 unsigned PtrStoreOpc = 0;
21725 unsigned LabelReg = 0;
21726 const int64_t LabelOffset = 1 * PVT.getStoreSize();
21727 Reloc::Model RM = MF->getTarget().getRelocationModel();
21728 bool UseImmLabel = (MF->getTarget().getCodeModel() == CodeModel::Small) &&
21729 (RM == Reloc::Static || RM == Reloc::DynamicNoPIC);
21731 // Prepare IP either in reg or imm.
21732 if (!UseImmLabel) {
21733 PtrStoreOpc = (PVT == MVT::i64) ? X86::MOV64mr : X86::MOV32mr;
21734 const TargetRegisterClass *PtrRC = getRegClassFor(PVT);
21735 LabelReg = MRI.createVirtualRegister(PtrRC);
21736 if (Subtarget->is64Bit()) {
21737 MIB = BuildMI(*thisMBB, MI, DL, TII->get(X86::LEA64r), LabelReg)
21741 .addMBB(restoreMBB)
21744 const X86InstrInfo *XII = static_cast<const X86InstrInfo*>(TII);
21745 MIB = BuildMI(*thisMBB, MI, DL, TII->get(X86::LEA32r), LabelReg)
21746 .addReg(XII->getGlobalBaseReg(MF))
21749 .addMBB(restoreMBB, Subtarget->ClassifyBlockAddressReference())
21753 PtrStoreOpc = (PVT == MVT::i64) ? X86::MOV64mi32 : X86::MOV32mi;
21755 MIB = BuildMI(*thisMBB, MI, DL, TII->get(PtrStoreOpc));
21756 for (unsigned i = 0; i < X86::AddrNumOperands; ++i) {
21757 if (i == X86::AddrDisp)
21758 MIB.addDisp(MI->getOperand(MemOpndSlot + i), LabelOffset);
21760 MIB.addOperand(MI->getOperand(MemOpndSlot + i));
21763 MIB.addReg(LabelReg);
21765 MIB.addMBB(restoreMBB);
21766 MIB.setMemRefs(MMOBegin, MMOEnd);
21768 MIB = BuildMI(*thisMBB, MI, DL, TII->get(X86::EH_SjLj_Setup))
21769 .addMBB(restoreMBB);
21771 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
21772 MIB.addRegMask(RegInfo->getNoPreservedMask());
21773 thisMBB->addSuccessor(mainMBB);
21774 thisMBB->addSuccessor(restoreMBB);
21778 BuildMI(mainMBB, DL, TII->get(X86::MOV32r0), mainDstReg);
21779 mainMBB->addSuccessor(sinkMBB);
21782 BuildMI(*sinkMBB, sinkMBB->begin(), DL,
21783 TII->get(X86::PHI), DstReg)
21784 .addReg(mainDstReg).addMBB(mainMBB)
21785 .addReg(restoreDstReg).addMBB(restoreMBB);
21788 if (RegInfo->hasBasePointer(*MF)) {
21789 const bool Uses64BitFramePtr =
21790 Subtarget->isTarget64BitLP64() || Subtarget->isTargetNaCl64();
21791 X86MachineFunctionInfo *X86FI = MF->getInfo<X86MachineFunctionInfo>();
21792 X86FI->setRestoreBasePointer(MF);
21793 unsigned FramePtr = RegInfo->getFrameRegister(*MF);
21794 unsigned BasePtr = RegInfo->getBaseRegister();
21795 unsigned Opm = Uses64BitFramePtr ? X86::MOV64rm : X86::MOV32rm;
21796 addRegOffset(BuildMI(restoreMBB, DL, TII->get(Opm), BasePtr),
21797 FramePtr, true, X86FI->getRestoreBasePointerOffset())
21798 .setMIFlag(MachineInstr::FrameSetup);
21800 BuildMI(restoreMBB, DL, TII->get(X86::MOV32ri), restoreDstReg).addImm(1);
21801 BuildMI(restoreMBB, DL, TII->get(X86::JMP_1)).addMBB(sinkMBB);
21802 restoreMBB->addSuccessor(sinkMBB);
21804 MI->eraseFromParent();
21808 MachineBasicBlock *
21809 X86TargetLowering::emitEHSjLjLongJmp(MachineInstr *MI,
21810 MachineBasicBlock *MBB) const {
21811 DebugLoc DL = MI->getDebugLoc();
21812 MachineFunction *MF = MBB->getParent();
21813 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
21814 MachineRegisterInfo &MRI = MF->getRegInfo();
21816 // Memory Reference
21817 MachineInstr::mmo_iterator MMOBegin = MI->memoperands_begin();
21818 MachineInstr::mmo_iterator MMOEnd = MI->memoperands_end();
21820 MVT PVT = getPointerTy(MF->getDataLayout());
21821 assert((PVT == MVT::i64 || PVT == MVT::i32) &&
21822 "Invalid Pointer Size!");
21824 const TargetRegisterClass *RC =
21825 (PVT == MVT::i64) ? &X86::GR64RegClass : &X86::GR32RegClass;
21826 unsigned Tmp = MRI.createVirtualRegister(RC);
21827 // Since FP is only updated here but NOT referenced, it's treated as GPR.
21828 const X86RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
21829 unsigned FP = (PVT == MVT::i64) ? X86::RBP : X86::EBP;
21830 unsigned SP = RegInfo->getStackRegister();
21832 MachineInstrBuilder MIB;
21834 const int64_t LabelOffset = 1 * PVT.getStoreSize();
21835 const int64_t SPOffset = 2 * PVT.getStoreSize();
21837 unsigned PtrLoadOpc = (PVT == MVT::i64) ? X86::MOV64rm : X86::MOV32rm;
21838 unsigned IJmpOpc = (PVT == MVT::i64) ? X86::JMP64r : X86::JMP32r;
21841 MIB = BuildMI(*MBB, MI, DL, TII->get(PtrLoadOpc), FP);
21842 for (unsigned i = 0; i < X86::AddrNumOperands; ++i)
21843 MIB.addOperand(MI->getOperand(i));
21844 MIB.setMemRefs(MMOBegin, MMOEnd);
21846 MIB = BuildMI(*MBB, MI, DL, TII->get(PtrLoadOpc), Tmp);
21847 for (unsigned i = 0; i < X86::AddrNumOperands; ++i) {
21848 if (i == X86::AddrDisp)
21849 MIB.addDisp(MI->getOperand(i), LabelOffset);
21851 MIB.addOperand(MI->getOperand(i));
21853 MIB.setMemRefs(MMOBegin, MMOEnd);
21855 MIB = BuildMI(*MBB, MI, DL, TII->get(PtrLoadOpc), SP);
21856 for (unsigned i = 0; i < X86::AddrNumOperands; ++i) {
21857 if (i == X86::AddrDisp)
21858 MIB.addDisp(MI->getOperand(i), SPOffset);
21860 MIB.addOperand(MI->getOperand(i));
21862 MIB.setMemRefs(MMOBegin, MMOEnd);
21864 BuildMI(*MBB, MI, DL, TII->get(IJmpOpc)).addReg(Tmp);
21866 MI->eraseFromParent();
21870 // Replace 213-type (isel default) FMA3 instructions with 231-type for
21871 // accumulator loops. Writing back to the accumulator allows the coalescer
21872 // to remove extra copies in the loop.
21873 // FIXME: Do this on AVX512. We don't support 231 variants yet (PR23937).
21874 MachineBasicBlock *
21875 X86TargetLowering::emitFMA3Instr(MachineInstr *MI,
21876 MachineBasicBlock *MBB) const {
21877 MachineOperand &AddendOp = MI->getOperand(3);
21879 // Bail out early if the addend isn't a register - we can't switch these.
21880 if (!AddendOp.isReg())
21883 MachineFunction &MF = *MBB->getParent();
21884 MachineRegisterInfo &MRI = MF.getRegInfo();
21886 // Check whether the addend is defined by a PHI:
21887 assert(MRI.hasOneDef(AddendOp.getReg()) && "Multiple defs in SSA?");
21888 MachineInstr &AddendDef = *MRI.def_instr_begin(AddendOp.getReg());
21889 if (!AddendDef.isPHI())
21892 // Look for the following pattern:
21894 // %addend = phi [%entry, 0], [%loop, %result]
21896 // %result<tied1> = FMA213 %m2<tied0>, %m1, %addend
21900 // %addend = phi [%entry, 0], [%loop, %result]
21902 // %result<tied1> = FMA231 %addend<tied0>, %m1, %m2
21904 for (unsigned i = 1, e = AddendDef.getNumOperands(); i < e; i += 2) {
21905 assert(AddendDef.getOperand(i).isReg());
21906 MachineOperand PHISrcOp = AddendDef.getOperand(i);
21907 MachineInstr &PHISrcInst = *MRI.def_instr_begin(PHISrcOp.getReg());
21908 if (&PHISrcInst == MI) {
21909 // Found a matching instruction.
21910 unsigned NewFMAOpc = 0;
21911 switch (MI->getOpcode()) {
21912 case X86::VFMADDPDr213r: NewFMAOpc = X86::VFMADDPDr231r; break;
21913 case X86::VFMADDPSr213r: NewFMAOpc = X86::VFMADDPSr231r; break;
21914 case X86::VFMADDSDr213r: NewFMAOpc = X86::VFMADDSDr231r; break;
21915 case X86::VFMADDSSr213r: NewFMAOpc = X86::VFMADDSSr231r; break;
21916 case X86::VFMSUBPDr213r: NewFMAOpc = X86::VFMSUBPDr231r; break;
21917 case X86::VFMSUBPSr213r: NewFMAOpc = X86::VFMSUBPSr231r; break;
21918 case X86::VFMSUBSDr213r: NewFMAOpc = X86::VFMSUBSDr231r; break;
21919 case X86::VFMSUBSSr213r: NewFMAOpc = X86::VFMSUBSSr231r; break;
21920 case X86::VFNMADDPDr213r: NewFMAOpc = X86::VFNMADDPDr231r; break;
21921 case X86::VFNMADDPSr213r: NewFMAOpc = X86::VFNMADDPSr231r; break;
21922 case X86::VFNMADDSDr213r: NewFMAOpc = X86::VFNMADDSDr231r; break;
21923 case X86::VFNMADDSSr213r: NewFMAOpc = X86::VFNMADDSSr231r; break;
21924 case X86::VFNMSUBPDr213r: NewFMAOpc = X86::VFNMSUBPDr231r; break;
21925 case X86::VFNMSUBPSr213r: NewFMAOpc = X86::VFNMSUBPSr231r; break;
21926 case X86::VFNMSUBSDr213r: NewFMAOpc = X86::VFNMSUBSDr231r; break;
21927 case X86::VFNMSUBSSr213r: NewFMAOpc = X86::VFNMSUBSSr231r; break;
21928 case X86::VFMADDSUBPDr213r: NewFMAOpc = X86::VFMADDSUBPDr231r; break;
21929 case X86::VFMADDSUBPSr213r: NewFMAOpc = X86::VFMADDSUBPSr231r; break;
21930 case X86::VFMSUBADDPDr213r: NewFMAOpc = X86::VFMSUBADDPDr231r; break;
21931 case X86::VFMSUBADDPSr213r: NewFMAOpc = X86::VFMSUBADDPSr231r; break;
21933 case X86::VFMADDPDr213rY: NewFMAOpc = X86::VFMADDPDr231rY; break;
21934 case X86::VFMADDPSr213rY: NewFMAOpc = X86::VFMADDPSr231rY; break;
21935 case X86::VFMSUBPDr213rY: NewFMAOpc = X86::VFMSUBPDr231rY; break;
21936 case X86::VFMSUBPSr213rY: NewFMAOpc = X86::VFMSUBPSr231rY; break;
21937 case X86::VFNMADDPDr213rY: NewFMAOpc = X86::VFNMADDPDr231rY; break;
21938 case X86::VFNMADDPSr213rY: NewFMAOpc = X86::VFNMADDPSr231rY; break;
21939 case X86::VFNMSUBPDr213rY: NewFMAOpc = X86::VFNMSUBPDr231rY; break;
21940 case X86::VFNMSUBPSr213rY: NewFMAOpc = X86::VFNMSUBPSr231rY; break;
21941 case X86::VFMADDSUBPDr213rY: NewFMAOpc = X86::VFMADDSUBPDr231rY; break;
21942 case X86::VFMADDSUBPSr213rY: NewFMAOpc = X86::VFMADDSUBPSr231rY; break;
21943 case X86::VFMSUBADDPDr213rY: NewFMAOpc = X86::VFMSUBADDPDr231rY; break;
21944 case X86::VFMSUBADDPSr213rY: NewFMAOpc = X86::VFMSUBADDPSr231rY; break;
21945 default: llvm_unreachable("Unrecognized FMA variant.");
21948 const TargetInstrInfo &TII = *Subtarget->getInstrInfo();
21949 MachineInstrBuilder MIB =
21950 BuildMI(MF, MI->getDebugLoc(), TII.get(NewFMAOpc))
21951 .addOperand(MI->getOperand(0))
21952 .addOperand(MI->getOperand(3))
21953 .addOperand(MI->getOperand(2))
21954 .addOperand(MI->getOperand(1));
21955 MBB->insert(MachineBasicBlock::iterator(MI), MIB);
21956 MI->eraseFromParent();
21963 MachineBasicBlock *
21964 X86TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
21965 MachineBasicBlock *BB) const {
21966 switch (MI->getOpcode()) {
21967 default: llvm_unreachable("Unexpected instr type to insert");
21968 case X86::TAILJMPd64:
21969 case X86::TAILJMPr64:
21970 case X86::TAILJMPm64:
21971 case X86::TAILJMPd64_REX:
21972 case X86::TAILJMPr64_REX:
21973 case X86::TAILJMPm64_REX:
21974 llvm_unreachable("TAILJMP64 would not be touched here.");
21975 case X86::TCRETURNdi64:
21976 case X86::TCRETURNri64:
21977 case X86::TCRETURNmi64:
21979 case X86::WIN_ALLOCA:
21980 return EmitLoweredWinAlloca(MI, BB);
21981 case X86::CATCHRET:
21982 return EmitLoweredCatchRet(MI, BB);
21983 case X86::CATCHPAD:
21984 return EmitLoweredCatchPad(MI, BB);
21985 case X86::SEG_ALLOCA_32:
21986 case X86::SEG_ALLOCA_64:
21987 return EmitLoweredSegAlloca(MI, BB);
21988 case X86::TLSCall_32:
21989 case X86::TLSCall_64:
21990 return EmitLoweredTLSCall(MI, BB);
21991 case X86::CMOV_FR32:
21992 case X86::CMOV_FR64:
21993 case X86::CMOV_GR8:
21994 case X86::CMOV_GR16:
21995 case X86::CMOV_GR32:
21996 case X86::CMOV_RFP32:
21997 case X86::CMOV_RFP64:
21998 case X86::CMOV_RFP80:
21999 case X86::CMOV_V2F64:
22000 case X86::CMOV_V2I64:
22001 case X86::CMOV_V4F32:
22002 case X86::CMOV_V4F64:
22003 case X86::CMOV_V4I64:
22004 case X86::CMOV_V16F32:
22005 case X86::CMOV_V8F32:
22006 case X86::CMOV_V8F64:
22007 case X86::CMOV_V8I64:
22008 case X86::CMOV_V8I1:
22009 case X86::CMOV_V16I1:
22010 case X86::CMOV_V32I1:
22011 case X86::CMOV_V64I1:
22012 return EmitLoweredSelect(MI, BB);
22014 case X86::RELEASE_FADD32mr:
22015 case X86::RELEASE_FADD64mr:
22016 return EmitLoweredAtomicFP(MI, BB);
22018 case X86::FP32_TO_INT16_IN_MEM:
22019 case X86::FP32_TO_INT32_IN_MEM:
22020 case X86::FP32_TO_INT64_IN_MEM:
22021 case X86::FP64_TO_INT16_IN_MEM:
22022 case X86::FP64_TO_INT32_IN_MEM:
22023 case X86::FP64_TO_INT64_IN_MEM:
22024 case X86::FP80_TO_INT16_IN_MEM:
22025 case X86::FP80_TO_INT32_IN_MEM:
22026 case X86::FP80_TO_INT64_IN_MEM: {
22027 MachineFunction *F = BB->getParent();
22028 const TargetInstrInfo *TII = Subtarget->getInstrInfo();
22029 DebugLoc DL = MI->getDebugLoc();
22031 // Change the floating point control register to use "round towards zero"
22032 // mode when truncating to an integer value.
22033 int CWFrameIdx = F->getFrameInfo()->CreateStackObject(2, 2, false);
22034 addFrameReference(BuildMI(*BB, MI, DL,
22035 TII->get(X86::FNSTCW16m)), CWFrameIdx);
22037 // Load the old value of the high byte of the control word...
22039 F->getRegInfo().createVirtualRegister(&X86::GR16RegClass);
22040 addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16rm), OldCW),
22043 // Set the high part to be round to zero...
22044 addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16mi)), CWFrameIdx)
22047 // Reload the modified control word now...
22048 addFrameReference(BuildMI(*BB, MI, DL,
22049 TII->get(X86::FLDCW16m)), CWFrameIdx);
22051 // Restore the memory image of control word to original value
22052 addFrameReference(BuildMI(*BB, MI, DL, TII->get(X86::MOV16mr)), CWFrameIdx)
22055 // Get the X86 opcode to use.
22057 switch (MI->getOpcode()) {
22058 default: llvm_unreachable("illegal opcode!");
22059 case X86::FP32_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m32; break;
22060 case X86::FP32_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m32; break;
22061 case X86::FP32_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m32; break;
22062 case X86::FP64_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m64; break;
22063 case X86::FP64_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m64; break;
22064 case X86::FP64_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m64; break;
22065 case X86::FP80_TO_INT16_IN_MEM: Opc = X86::IST_Fp16m80; break;
22066 case X86::FP80_TO_INT32_IN_MEM: Opc = X86::IST_Fp32m80; break;
22067 case X86::FP80_TO_INT64_IN_MEM: Opc = X86::IST_Fp64m80; break;
22071 MachineOperand &Op = MI->getOperand(0);
22073 AM.BaseType = X86AddressMode::RegBase;
22074 AM.Base.Reg = Op.getReg();
22076 AM.BaseType = X86AddressMode::FrameIndexBase;
22077 AM.Base.FrameIndex = Op.getIndex();
22079 Op = MI->getOperand(1);
22081 AM.Scale = Op.getImm();
22082 Op = MI->getOperand(2);
22084 AM.IndexReg = Op.getImm();
22085 Op = MI->getOperand(3);
22086 if (Op.isGlobal()) {
22087 AM.GV = Op.getGlobal();
22089 AM.Disp = Op.getImm();
22091 addFullAddress(BuildMI(*BB, MI, DL, TII->get(Opc)), AM)
22092 .addReg(MI->getOperand(X86::AddrNumOperands).getReg());
22094 // Reload the original control word now.
22095 addFrameReference(BuildMI(*BB, MI, DL,
22096 TII->get(X86::FLDCW16m)), CWFrameIdx);
22098 MI->eraseFromParent(); // The pseudo instruction is gone now.
22101 // String/text processing lowering.
22102 case X86::PCMPISTRM128REG:
22103 case X86::VPCMPISTRM128REG:
22104 case X86::PCMPISTRM128MEM:
22105 case X86::VPCMPISTRM128MEM:
22106 case X86::PCMPESTRM128REG:
22107 case X86::VPCMPESTRM128REG:
22108 case X86::PCMPESTRM128MEM:
22109 case X86::VPCMPESTRM128MEM:
22110 assert(Subtarget->hasSSE42() &&
22111 "Target must have SSE4.2 or AVX features enabled");
22112 return EmitPCMPSTRM(MI, BB, Subtarget->getInstrInfo());
22114 // String/text processing lowering.
22115 case X86::PCMPISTRIREG:
22116 case X86::VPCMPISTRIREG:
22117 case X86::PCMPISTRIMEM:
22118 case X86::VPCMPISTRIMEM:
22119 case X86::PCMPESTRIREG:
22120 case X86::VPCMPESTRIREG:
22121 case X86::PCMPESTRIMEM:
22122 case X86::VPCMPESTRIMEM:
22123 assert(Subtarget->hasSSE42() &&
22124 "Target must have SSE4.2 or AVX features enabled");
22125 return EmitPCMPSTRI(MI, BB, Subtarget->getInstrInfo());
22127 // Thread synchronization.
22129 return EmitMonitor(MI, BB, Subtarget);
22133 return EmitXBegin(MI, BB, Subtarget->getInstrInfo());
22135 case X86::VASTART_SAVE_XMM_REGS:
22136 return EmitVAStartSaveXMMRegsWithCustomInserter(MI, BB);
22138 case X86::VAARG_64:
22139 return EmitVAARG64WithCustomInserter(MI, BB);
22141 case X86::EH_SjLj_SetJmp32:
22142 case X86::EH_SjLj_SetJmp64:
22143 return emitEHSjLjSetJmp(MI, BB);
22145 case X86::EH_SjLj_LongJmp32:
22146 case X86::EH_SjLj_LongJmp64:
22147 return emitEHSjLjLongJmp(MI, BB);
22149 case TargetOpcode::STATEPOINT:
22150 // As an implementation detail, STATEPOINT shares the STACKMAP format at
22151 // this point in the process. We diverge later.
22152 return emitPatchPoint(MI, BB);
22154 case TargetOpcode::STACKMAP:
22155 case TargetOpcode::PATCHPOINT:
22156 return emitPatchPoint(MI, BB);
22158 case X86::VFMADDPDr213r:
22159 case X86::VFMADDPSr213r:
22160 case X86::VFMADDSDr213r:
22161 case X86::VFMADDSSr213r:
22162 case X86::VFMSUBPDr213r:
22163 case X86::VFMSUBPSr213r:
22164 case X86::VFMSUBSDr213r:
22165 case X86::VFMSUBSSr213r:
22166 case X86::VFNMADDPDr213r:
22167 case X86::VFNMADDPSr213r:
22168 case X86::VFNMADDSDr213r:
22169 case X86::VFNMADDSSr213r:
22170 case X86::VFNMSUBPDr213r:
22171 case X86::VFNMSUBPSr213r:
22172 case X86::VFNMSUBSDr213r:
22173 case X86::VFNMSUBSSr213r:
22174 case X86::VFMADDSUBPDr213r:
22175 case X86::VFMADDSUBPSr213r:
22176 case X86::VFMSUBADDPDr213r:
22177 case X86::VFMSUBADDPSr213r:
22178 case X86::VFMADDPDr213rY:
22179 case X86::VFMADDPSr213rY:
22180 case X86::VFMSUBPDr213rY:
22181 case X86::VFMSUBPSr213rY:
22182 case X86::VFNMADDPDr213rY:
22183 case X86::VFNMADDPSr213rY:
22184 case X86::VFNMSUBPDr213rY:
22185 case X86::VFNMSUBPSr213rY:
22186 case X86::VFMADDSUBPDr213rY:
22187 case X86::VFMADDSUBPSr213rY:
22188 case X86::VFMSUBADDPDr213rY:
22189 case X86::VFMSUBADDPSr213rY:
22190 return emitFMA3Instr(MI, BB);
22194 //===----------------------------------------------------------------------===//
22195 // X86 Optimization Hooks
22196 //===----------------------------------------------------------------------===//
22198 void X86TargetLowering::computeKnownBitsForTargetNode(const SDValue Op,
22201 const SelectionDAG &DAG,
22202 unsigned Depth) const {
22203 unsigned BitWidth = KnownZero.getBitWidth();
22204 unsigned Opc = Op.getOpcode();
22205 assert((Opc >= ISD::BUILTIN_OP_END ||
22206 Opc == ISD::INTRINSIC_WO_CHAIN ||
22207 Opc == ISD::INTRINSIC_W_CHAIN ||
22208 Opc == ISD::INTRINSIC_VOID) &&
22209 "Should use MaskedValueIsZero if you don't know whether Op"
22210 " is a target node!");
22212 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
22226 // These nodes' second result is a boolean.
22227 if (Op.getResNo() == 0)
22230 case X86ISD::SETCC:
22231 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
22233 case ISD::INTRINSIC_WO_CHAIN: {
22234 unsigned IntId = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
22235 unsigned NumLoBits = 0;
22238 case Intrinsic::x86_sse_movmsk_ps:
22239 case Intrinsic::x86_avx_movmsk_ps_256:
22240 case Intrinsic::x86_sse2_movmsk_pd:
22241 case Intrinsic::x86_avx_movmsk_pd_256:
22242 case Intrinsic::x86_mmx_pmovmskb:
22243 case Intrinsic::x86_sse2_pmovmskb_128:
22244 case Intrinsic::x86_avx2_pmovmskb: {
22245 // High bits of movmskp{s|d}, pmovmskb are known zero.
22247 default: llvm_unreachable("Impossible intrinsic"); // Can't reach here.
22248 case Intrinsic::x86_sse_movmsk_ps: NumLoBits = 4; break;
22249 case Intrinsic::x86_avx_movmsk_ps_256: NumLoBits = 8; break;
22250 case Intrinsic::x86_sse2_movmsk_pd: NumLoBits = 2; break;
22251 case Intrinsic::x86_avx_movmsk_pd_256: NumLoBits = 4; break;
22252 case Intrinsic::x86_mmx_pmovmskb: NumLoBits = 8; break;
22253 case Intrinsic::x86_sse2_pmovmskb_128: NumLoBits = 16; break;
22254 case Intrinsic::x86_avx2_pmovmskb: NumLoBits = 32; break;
22256 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - NumLoBits);
22265 unsigned X86TargetLowering::ComputeNumSignBitsForTargetNode(
22267 const SelectionDAG &,
22268 unsigned Depth) const {
22269 // SETCC_CARRY sets the dest to ~0 for true or 0 for false.
22270 if (Op.getOpcode() == X86ISD::SETCC_CARRY)
22271 return Op.getValueType().getScalarSizeInBits();
22277 /// isGAPlusOffset - Returns true (and the GlobalValue and the offset) if the
22278 /// node is a GlobalAddress + offset.
22279 bool X86TargetLowering::isGAPlusOffset(SDNode *N,
22280 const GlobalValue* &GA,
22281 int64_t &Offset) const {
22282 if (N->getOpcode() == X86ISD::Wrapper) {
22283 if (isa<GlobalAddressSDNode>(N->getOperand(0))) {
22284 GA = cast<GlobalAddressSDNode>(N->getOperand(0))->getGlobal();
22285 Offset = cast<GlobalAddressSDNode>(N->getOperand(0))->getOffset();
22289 return TargetLowering::isGAPlusOffset(N, GA, Offset);
22292 /// isShuffleHigh128VectorInsertLow - Checks whether the shuffle node is the
22293 /// same as extracting the high 128-bit part of 256-bit vector and then
22294 /// inserting the result into the low part of a new 256-bit vector
22295 static bool isShuffleHigh128VectorInsertLow(ShuffleVectorSDNode *SVOp) {
22296 EVT VT = SVOp->getValueType(0);
22297 unsigned NumElems = VT.getVectorNumElements();
22299 // vector_shuffle <4, 5, 6, 7, u, u, u, u> or <2, 3, u, u>
22300 for (unsigned i = 0, j = NumElems/2; i != NumElems/2; ++i, ++j)
22301 if (!isUndefOrEqual(SVOp->getMaskElt(i), j) ||
22302 SVOp->getMaskElt(j) >= 0)
22308 /// isShuffleLow128VectorInsertHigh - Checks whether the shuffle node is the
22309 /// same as extracting the low 128-bit part of 256-bit vector and then
22310 /// inserting the result into the high part of a new 256-bit vector
22311 static bool isShuffleLow128VectorInsertHigh(ShuffleVectorSDNode *SVOp) {
22312 EVT VT = SVOp->getValueType(0);
22313 unsigned NumElems = VT.getVectorNumElements();
22315 // vector_shuffle <u, u, u, u, 0, 1, 2, 3> or <u, u, 0, 1>
22316 for (unsigned i = NumElems/2, j = 0; i != NumElems; ++i, ++j)
22317 if (!isUndefOrEqual(SVOp->getMaskElt(i), j) ||
22318 SVOp->getMaskElt(j) >= 0)
22324 /// PerformShuffleCombine256 - Performs shuffle combines for 256-bit vectors.
22325 static SDValue PerformShuffleCombine256(SDNode *N, SelectionDAG &DAG,
22326 TargetLowering::DAGCombinerInfo &DCI,
22327 const X86Subtarget* Subtarget) {
22329 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
22330 SDValue V1 = SVOp->getOperand(0);
22331 SDValue V2 = SVOp->getOperand(1);
22332 MVT VT = SVOp->getSimpleValueType(0);
22333 unsigned NumElems = VT.getVectorNumElements();
22335 if (V1.getOpcode() == ISD::CONCAT_VECTORS &&
22336 V2.getOpcode() == ISD::CONCAT_VECTORS) {
22340 // V UNDEF BUILD_VECTOR UNDEF
22342 // CONCAT_VECTOR CONCAT_VECTOR
22345 // RESULT: V + zero extended
22347 if (V2.getOperand(0).getOpcode() != ISD::BUILD_VECTOR ||
22348 V2.getOperand(1).getOpcode() != ISD::UNDEF ||
22349 V1.getOperand(1).getOpcode() != ISD::UNDEF)
22352 if (!ISD::isBuildVectorAllZeros(V2.getOperand(0).getNode()))
22355 // To match the shuffle mask, the first half of the mask should
22356 // be exactly the first vector, and all the rest a splat with the
22357 // first element of the second one.
22358 for (unsigned i = 0; i != NumElems/2; ++i)
22359 if (!isUndefOrEqual(SVOp->getMaskElt(i), i) ||
22360 !isUndefOrEqual(SVOp->getMaskElt(i+NumElems/2), NumElems))
22363 // If V1 is coming from a vector load then just fold to a VZEXT_LOAD.
22364 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(V1.getOperand(0))) {
22365 if (Ld->hasNUsesOfValue(1, 0)) {
22366 SDVTList Tys = DAG.getVTList(MVT::v4i64, MVT::Other);
22367 SDValue Ops[] = { Ld->getChain(), Ld->getBasePtr() };
22369 DAG.getMemIntrinsicNode(X86ISD::VZEXT_LOAD, dl, Tys, Ops,
22371 Ld->getPointerInfo(),
22372 Ld->getAlignment(),
22373 false/*isVolatile*/, true/*ReadMem*/,
22374 false/*WriteMem*/);
22376 // Make sure the newly-created LOAD is in the same position as Ld in
22377 // terms of dependency. We create a TokenFactor for Ld and ResNode,
22378 // and update uses of Ld's output chain to use the TokenFactor.
22379 if (Ld->hasAnyUseOfValue(1)) {
22380 SDValue NewChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
22381 SDValue(Ld, 1), SDValue(ResNode.getNode(), 1));
22382 DAG.ReplaceAllUsesOfValueWith(SDValue(Ld, 1), NewChain);
22383 DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(Ld, 1),
22384 SDValue(ResNode.getNode(), 1));
22387 return DAG.getBitcast(VT, ResNode);
22391 // Emit a zeroed vector and insert the desired subvector on its
22393 SDValue Zeros = getZeroVector(VT, Subtarget, DAG, dl);
22394 SDValue InsV = Insert128BitVector(Zeros, V1.getOperand(0), 0, DAG, dl);
22395 return DCI.CombineTo(N, InsV);
22398 //===--------------------------------------------------------------------===//
22399 // Combine some shuffles into subvector extracts and inserts:
22402 // vector_shuffle <4, 5, 6, 7, u, u, u, u> or <2, 3, u, u>
22403 if (isShuffleHigh128VectorInsertLow(SVOp)) {
22404 SDValue V = Extract128BitVector(V1, NumElems/2, DAG, dl);
22405 SDValue InsV = Insert128BitVector(DAG.getUNDEF(VT), V, 0, DAG, dl);
22406 return DCI.CombineTo(N, InsV);
22409 // vector_shuffle <u, u, u, u, 0, 1, 2, 3> or <u, u, 0, 1>
22410 if (isShuffleLow128VectorInsertHigh(SVOp)) {
22411 SDValue V = Extract128BitVector(V1, 0, DAG, dl);
22412 SDValue InsV = Insert128BitVector(DAG.getUNDEF(VT), V, NumElems/2, DAG, dl);
22413 return DCI.CombineTo(N, InsV);
22419 /// \brief Combine an arbitrary chain of shuffles into a single instruction if
22422 /// This is the leaf of the recursive combinine below. When we have found some
22423 /// chain of single-use x86 shuffle instructions and accumulated the combined
22424 /// shuffle mask represented by them, this will try to pattern match that mask
22425 /// into either a single instruction if there is a special purpose instruction
22426 /// for this operation, or into a PSHUFB instruction which is a fully general
22427 /// instruction but should only be used to replace chains over a certain depth.
22428 static bool combineX86ShuffleChain(SDValue Op, SDValue Root, ArrayRef<int> Mask,
22429 int Depth, bool HasPSHUFB, SelectionDAG &DAG,
22430 TargetLowering::DAGCombinerInfo &DCI,
22431 const X86Subtarget *Subtarget) {
22432 assert(!Mask.empty() && "Cannot combine an empty shuffle mask!");
22434 // Find the operand that enters the chain. Note that multiple uses are OK
22435 // here, we're not going to remove the operand we find.
22436 SDValue Input = Op.getOperand(0);
22437 while (Input.getOpcode() == ISD::BITCAST)
22438 Input = Input.getOperand(0);
22440 MVT VT = Input.getSimpleValueType();
22441 MVT RootVT = Root.getSimpleValueType();
22444 if (Mask.size() == 1) {
22445 int Index = Mask[0];
22446 assert((Index >= 0 || Index == SM_SentinelUndef ||
22447 Index == SM_SentinelZero) &&
22448 "Invalid shuffle index found!");
22450 // We may end up with an accumulated mask of size 1 as a result of
22451 // widening of shuffle operands (see function canWidenShuffleElements).
22452 // If the only shuffle index is equal to SM_SentinelZero then propagate
22453 // a zero vector. Otherwise, the combine shuffle mask is a no-op shuffle
22454 // mask, and therefore the entire chain of shuffles can be folded away.
22455 if (Index == SM_SentinelZero)
22456 DCI.CombineTo(Root.getNode(), getZeroVector(RootVT, Subtarget, DAG, DL));
22458 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Input),
22463 // Use the float domain if the operand type is a floating point type.
22464 bool FloatDomain = VT.isFloatingPoint();
22466 // For floating point shuffles, we don't have free copies in the shuffle
22467 // instructions or the ability to load as part of the instruction, so
22468 // canonicalize their shuffles to UNPCK or MOV variants.
22470 // Note that even with AVX we prefer the PSHUFD form of shuffle for integer
22471 // vectors because it can have a load folded into it that UNPCK cannot. This
22472 // doesn't preclude something switching to the shorter encoding post-RA.
22474 // FIXME: Should teach these routines about AVX vector widths.
22475 if (FloatDomain && VT.is128BitVector()) {
22476 if (Mask.equals({0, 0}) || Mask.equals({1, 1})) {
22477 bool Lo = Mask.equals({0, 0});
22480 // Check if we have SSE3 which will let us use MOVDDUP. That instruction
22481 // is no slower than UNPCKLPD but has the option to fold the input operand
22482 // into even an unaligned memory load.
22483 if (Lo && Subtarget->hasSSE3()) {
22484 Shuffle = X86ISD::MOVDDUP;
22485 ShuffleVT = MVT::v2f64;
22487 // We have MOVLHPS and MOVHLPS throughout SSE and they encode smaller
22488 // than the UNPCK variants.
22489 Shuffle = Lo ? X86ISD::MOVLHPS : X86ISD::MOVHLPS;
22490 ShuffleVT = MVT::v4f32;
22492 if (Depth == 1 && Root->getOpcode() == Shuffle)
22493 return false; // Nothing to do!
22494 Op = DAG.getBitcast(ShuffleVT, Input);
22495 DCI.AddToWorklist(Op.getNode());
22496 if (Shuffle == X86ISD::MOVDDUP)
22497 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op);
22499 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op, Op);
22500 DCI.AddToWorklist(Op.getNode());
22501 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22505 if (Subtarget->hasSSE3() &&
22506 (Mask.equals({0, 0, 2, 2}) || Mask.equals({1, 1, 3, 3}))) {
22507 bool Lo = Mask.equals({0, 0, 2, 2});
22508 unsigned Shuffle = Lo ? X86ISD::MOVSLDUP : X86ISD::MOVSHDUP;
22509 MVT ShuffleVT = MVT::v4f32;
22510 if (Depth == 1 && Root->getOpcode() == Shuffle)
22511 return false; // Nothing to do!
22512 Op = DAG.getBitcast(ShuffleVT, Input);
22513 DCI.AddToWorklist(Op.getNode());
22514 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op);
22515 DCI.AddToWorklist(Op.getNode());
22516 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22520 if (Mask.equals({0, 0, 1, 1}) || Mask.equals({2, 2, 3, 3})) {
22521 bool Lo = Mask.equals({0, 0, 1, 1});
22522 unsigned Shuffle = Lo ? X86ISD::UNPCKL : X86ISD::UNPCKH;
22523 MVT ShuffleVT = MVT::v4f32;
22524 if (Depth == 1 && Root->getOpcode() == Shuffle)
22525 return false; // Nothing to do!
22526 Op = DAG.getBitcast(ShuffleVT, Input);
22527 DCI.AddToWorklist(Op.getNode());
22528 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op, Op);
22529 DCI.AddToWorklist(Op.getNode());
22530 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22536 // We always canonicalize the 8 x i16 and 16 x i8 shuffles into their UNPCK
22537 // variants as none of these have single-instruction variants that are
22538 // superior to the UNPCK formulation.
22539 if (!FloatDomain && VT.is128BitVector() &&
22540 (Mask.equals({0, 0, 1, 1, 2, 2, 3, 3}) ||
22541 Mask.equals({4, 4, 5, 5, 6, 6, 7, 7}) ||
22542 Mask.equals({0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7}) ||
22544 {8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15}))) {
22545 bool Lo = Mask[0] == 0;
22546 unsigned Shuffle = Lo ? X86ISD::UNPCKL : X86ISD::UNPCKH;
22547 if (Depth == 1 && Root->getOpcode() == Shuffle)
22548 return false; // Nothing to do!
22550 switch (Mask.size()) {
22552 ShuffleVT = MVT::v8i16;
22555 ShuffleVT = MVT::v16i8;
22558 llvm_unreachable("Impossible mask size!");
22560 Op = DAG.getBitcast(ShuffleVT, Input);
22561 DCI.AddToWorklist(Op.getNode());
22562 Op = DAG.getNode(Shuffle, DL, ShuffleVT, Op, Op);
22563 DCI.AddToWorklist(Op.getNode());
22564 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22569 // Don't try to re-form single instruction chains under any circumstances now
22570 // that we've done encoding canonicalization for them.
22574 // If we have 3 or more shuffle instructions or a chain involving PSHUFB, we
22575 // can replace them with a single PSHUFB instruction profitably. Intel's
22576 // manuals suggest only using PSHUFB if doing so replacing 5 instructions, but
22577 // in practice PSHUFB tends to be *very* fast so we're more aggressive.
22578 if ((Depth >= 3 || HasPSHUFB) && Subtarget->hasSSSE3()) {
22579 SmallVector<SDValue, 16> PSHUFBMask;
22580 int NumBytes = VT.getSizeInBits() / 8;
22581 int Ratio = NumBytes / Mask.size();
22582 for (int i = 0; i < NumBytes; ++i) {
22583 if (Mask[i / Ratio] == SM_SentinelUndef) {
22584 PSHUFBMask.push_back(DAG.getUNDEF(MVT::i8));
22587 int M = Mask[i / Ratio] != SM_SentinelZero
22588 ? Ratio * Mask[i / Ratio] + i % Ratio
22590 PSHUFBMask.push_back(DAG.getConstant(M, DL, MVT::i8));
22592 MVT ByteVT = MVT::getVectorVT(MVT::i8, NumBytes);
22593 Op = DAG.getBitcast(ByteVT, Input);
22594 DCI.AddToWorklist(Op.getNode());
22595 SDValue PSHUFBMaskOp =
22596 DAG.getNode(ISD::BUILD_VECTOR, DL, ByteVT, PSHUFBMask);
22597 DCI.AddToWorklist(PSHUFBMaskOp.getNode());
22598 Op = DAG.getNode(X86ISD::PSHUFB, DL, ByteVT, Op, PSHUFBMaskOp);
22599 DCI.AddToWorklist(Op.getNode());
22600 DCI.CombineTo(Root.getNode(), DAG.getBitcast(RootVT, Op),
22605 // Failed to find any combines.
22609 /// \brief Fully generic combining of x86 shuffle instructions.
22611 /// This should be the last combine run over the x86 shuffle instructions. Once
22612 /// they have been fully optimized, this will recursively consider all chains
22613 /// of single-use shuffle instructions, build a generic model of the cumulative
22614 /// shuffle operation, and check for simpler instructions which implement this
22615 /// operation. We use this primarily for two purposes:
22617 /// 1) Collapse generic shuffles to specialized single instructions when
22618 /// equivalent. In most cases, this is just an encoding size win, but
22619 /// sometimes we will collapse multiple generic shuffles into a single
22620 /// special-purpose shuffle.
22621 /// 2) Look for sequences of shuffle instructions with 3 or more total
22622 /// instructions, and replace them with the slightly more expensive SSSE3
22623 /// PSHUFB instruction if available. We do this as the last combining step
22624 /// to ensure we avoid using PSHUFB if we can implement the shuffle with
22625 /// a suitable short sequence of other instructions. The PHUFB will either
22626 /// use a register or have to read from memory and so is slightly (but only
22627 /// slightly) more expensive than the other shuffle instructions.
22629 /// Because this is inherently a quadratic operation (for each shuffle in
22630 /// a chain, we recurse up the chain), the depth is limited to 8 instructions.
22631 /// This should never be an issue in practice as the shuffle lowering doesn't
22632 /// produce sequences of more than 8 instructions.
22634 /// FIXME: We will currently miss some cases where the redundant shuffling
22635 /// would simplify under the threshold for PSHUFB formation because of
22636 /// combine-ordering. To fix this, we should do the redundant instruction
22637 /// combining in this recursive walk.
22638 static bool combineX86ShufflesRecursively(SDValue Op, SDValue Root,
22639 ArrayRef<int> RootMask,
22640 int Depth, bool HasPSHUFB,
22642 TargetLowering::DAGCombinerInfo &DCI,
22643 const X86Subtarget *Subtarget) {
22644 // Bound the depth of our recursive combine because this is ultimately
22645 // quadratic in nature.
22649 // Directly rip through bitcasts to find the underlying operand.
22650 while (Op.getOpcode() == ISD::BITCAST && Op.getOperand(0).hasOneUse())
22651 Op = Op.getOperand(0);
22653 MVT VT = Op.getSimpleValueType();
22654 if (!VT.isVector())
22655 return false; // Bail if we hit a non-vector.
22657 assert(Root.getSimpleValueType().isVector() &&
22658 "Shuffles operate on vector types!");
22659 assert(VT.getSizeInBits() == Root.getSimpleValueType().getSizeInBits() &&
22660 "Can only combine shuffles of the same vector register size.");
22662 if (!isTargetShuffle(Op.getOpcode()))
22664 SmallVector<int, 16> OpMask;
22666 bool HaveMask = getTargetShuffleMask(Op.getNode(), VT, OpMask, IsUnary);
22667 // We only can combine unary shuffles which we can decode the mask for.
22668 if (!HaveMask || !IsUnary)
22671 assert(VT.getVectorNumElements() == OpMask.size() &&
22672 "Different mask size from vector size!");
22673 assert(((RootMask.size() > OpMask.size() &&
22674 RootMask.size() % OpMask.size() == 0) ||
22675 (OpMask.size() > RootMask.size() &&
22676 OpMask.size() % RootMask.size() == 0) ||
22677 OpMask.size() == RootMask.size()) &&
22678 "The smaller number of elements must divide the larger.");
22679 int RootRatio = std::max<int>(1, OpMask.size() / RootMask.size());
22680 int OpRatio = std::max<int>(1, RootMask.size() / OpMask.size());
22681 assert(((RootRatio == 1 && OpRatio == 1) ||
22682 (RootRatio == 1) != (OpRatio == 1)) &&
22683 "Must not have a ratio for both incoming and op masks!");
22685 SmallVector<int, 16> Mask;
22686 Mask.reserve(std::max(OpMask.size(), RootMask.size()));
22688 // Merge this shuffle operation's mask into our accumulated mask. Note that
22689 // this shuffle's mask will be the first applied to the input, followed by the
22690 // root mask to get us all the way to the root value arrangement. The reason
22691 // for this order is that we are recursing up the operation chain.
22692 for (int i = 0, e = std::max(OpMask.size(), RootMask.size()); i < e; ++i) {
22693 int RootIdx = i / RootRatio;
22694 if (RootMask[RootIdx] < 0) {
22695 // This is a zero or undef lane, we're done.
22696 Mask.push_back(RootMask[RootIdx]);
22700 int RootMaskedIdx = RootMask[RootIdx] * RootRatio + i % RootRatio;
22701 int OpIdx = RootMaskedIdx / OpRatio;
22702 if (OpMask[OpIdx] < 0) {
22703 // The incoming lanes are zero or undef, it doesn't matter which ones we
22705 Mask.push_back(OpMask[OpIdx]);
22709 // Ok, we have non-zero lanes, map them through.
22710 Mask.push_back(OpMask[OpIdx] * OpRatio +
22711 RootMaskedIdx % OpRatio);
22714 // See if we can recurse into the operand to combine more things.
22715 switch (Op.getOpcode()) {
22716 case X86ISD::PSHUFB:
22718 case X86ISD::PSHUFD:
22719 case X86ISD::PSHUFHW:
22720 case X86ISD::PSHUFLW:
22721 if (Op.getOperand(0).hasOneUse() &&
22722 combineX86ShufflesRecursively(Op.getOperand(0), Root, Mask, Depth + 1,
22723 HasPSHUFB, DAG, DCI, Subtarget))
22727 case X86ISD::UNPCKL:
22728 case X86ISD::UNPCKH:
22729 assert(Op.getOperand(0) == Op.getOperand(1) &&
22730 "We only combine unary shuffles!");
22731 // We can't check for single use, we have to check that this shuffle is the
22733 if (Op->isOnlyUserOf(Op.getOperand(0).getNode()) &&
22734 combineX86ShufflesRecursively(Op.getOperand(0), Root, Mask, Depth + 1,
22735 HasPSHUFB, DAG, DCI, Subtarget))
22740 // Minor canonicalization of the accumulated shuffle mask to make it easier
22741 // to match below. All this does is detect masks with squential pairs of
22742 // elements, and shrink them to the half-width mask. It does this in a loop
22743 // so it will reduce the size of the mask to the minimal width mask which
22744 // performs an equivalent shuffle.
22745 SmallVector<int, 16> WidenedMask;
22746 while (Mask.size() > 1 && canWidenShuffleElements(Mask, WidenedMask)) {
22747 Mask = std::move(WidenedMask);
22748 WidenedMask.clear();
22751 return combineX86ShuffleChain(Op, Root, Mask, Depth, HasPSHUFB, DAG, DCI,
22755 /// \brief Get the PSHUF-style mask from PSHUF node.
22757 /// This is a very minor wrapper around getTargetShuffleMask to easy forming v4
22758 /// PSHUF-style masks that can be reused with such instructions.
22759 static SmallVector<int, 4> getPSHUFShuffleMask(SDValue N) {
22760 MVT VT = N.getSimpleValueType();
22761 SmallVector<int, 4> Mask;
22763 bool HaveMask = getTargetShuffleMask(N.getNode(), VT, Mask, IsUnary);
22767 // If we have more than 128-bits, only the low 128-bits of shuffle mask
22768 // matter. Check that the upper masks are repeats and remove them.
22769 if (VT.getSizeInBits() > 128) {
22770 int LaneElts = 128 / VT.getScalarSizeInBits();
22772 for (int i = 1, NumLanes = VT.getSizeInBits() / 128; i < NumLanes; ++i)
22773 for (int j = 0; j < LaneElts; ++j)
22774 assert(Mask[j] == Mask[i * LaneElts + j] - (LaneElts * i) &&
22775 "Mask doesn't repeat in high 128-bit lanes!");
22777 Mask.resize(LaneElts);
22780 switch (N.getOpcode()) {
22781 case X86ISD::PSHUFD:
22783 case X86ISD::PSHUFLW:
22786 case X86ISD::PSHUFHW:
22787 Mask.erase(Mask.begin(), Mask.begin() + 4);
22788 for (int &M : Mask)
22792 llvm_unreachable("No valid shuffle instruction found!");
22796 /// \brief Search for a combinable shuffle across a chain ending in pshufd.
22798 /// We walk up the chain and look for a combinable shuffle, skipping over
22799 /// shuffles that we could hoist this shuffle's transformation past without
22800 /// altering anything.
22802 combineRedundantDWordShuffle(SDValue N, MutableArrayRef<int> Mask,
22804 TargetLowering::DAGCombinerInfo &DCI) {
22805 assert(N.getOpcode() == X86ISD::PSHUFD &&
22806 "Called with something other than an x86 128-bit half shuffle!");
22809 // Walk up a single-use chain looking for a combinable shuffle. Keep a stack
22810 // of the shuffles in the chain so that we can form a fresh chain to replace
22812 SmallVector<SDValue, 8> Chain;
22813 SDValue V = N.getOperand(0);
22814 for (; V.hasOneUse(); V = V.getOperand(0)) {
22815 switch (V.getOpcode()) {
22817 return SDValue(); // Nothing combined!
22820 // Skip bitcasts as we always know the type for the target specific
22824 case X86ISD::PSHUFD:
22825 // Found another dword shuffle.
22828 case X86ISD::PSHUFLW:
22829 // Check that the low words (being shuffled) are the identity in the
22830 // dword shuffle, and the high words are self-contained.
22831 if (Mask[0] != 0 || Mask[1] != 1 ||
22832 !(Mask[2] >= 2 && Mask[2] < 4 && Mask[3] >= 2 && Mask[3] < 4))
22835 Chain.push_back(V);
22838 case X86ISD::PSHUFHW:
22839 // Check that the high words (being shuffled) are the identity in the
22840 // dword shuffle, and the low words are self-contained.
22841 if (Mask[2] != 2 || Mask[3] != 3 ||
22842 !(Mask[0] >= 0 && Mask[0] < 2 && Mask[1] >= 0 && Mask[1] < 2))
22845 Chain.push_back(V);
22848 case X86ISD::UNPCKL:
22849 case X86ISD::UNPCKH:
22850 // For either i8 -> i16 or i16 -> i32 unpacks, we can combine a dword
22851 // shuffle into a preceding word shuffle.
22852 if (V.getSimpleValueType().getVectorElementType() != MVT::i8 &&
22853 V.getSimpleValueType().getVectorElementType() != MVT::i16)
22856 // Search for a half-shuffle which we can combine with.
22857 unsigned CombineOp =
22858 V.getOpcode() == X86ISD::UNPCKL ? X86ISD::PSHUFLW : X86ISD::PSHUFHW;
22859 if (V.getOperand(0) != V.getOperand(1) ||
22860 !V->isOnlyUserOf(V.getOperand(0).getNode()))
22862 Chain.push_back(V);
22863 V = V.getOperand(0);
22865 switch (V.getOpcode()) {
22867 return SDValue(); // Nothing to combine.
22869 case X86ISD::PSHUFLW:
22870 case X86ISD::PSHUFHW:
22871 if (V.getOpcode() == CombineOp)
22874 Chain.push_back(V);
22878 V = V.getOperand(0);
22882 } while (V.hasOneUse());
22885 // Break out of the loop if we break out of the switch.
22889 if (!V.hasOneUse())
22890 // We fell out of the loop without finding a viable combining instruction.
22893 // Merge this node's mask and our incoming mask.
22894 SmallVector<int, 4> VMask = getPSHUFShuffleMask(V);
22895 for (int &M : Mask)
22897 V = DAG.getNode(V.getOpcode(), DL, V.getValueType(), V.getOperand(0),
22898 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
22900 // Rebuild the chain around this new shuffle.
22901 while (!Chain.empty()) {
22902 SDValue W = Chain.pop_back_val();
22904 if (V.getValueType() != W.getOperand(0).getValueType())
22905 V = DAG.getBitcast(W.getOperand(0).getValueType(), V);
22907 switch (W.getOpcode()) {
22909 llvm_unreachable("Only PSHUF and UNPCK instructions get here!");
22911 case X86ISD::UNPCKL:
22912 case X86ISD::UNPCKH:
22913 V = DAG.getNode(W.getOpcode(), DL, W.getValueType(), V, V);
22916 case X86ISD::PSHUFD:
22917 case X86ISD::PSHUFLW:
22918 case X86ISD::PSHUFHW:
22919 V = DAG.getNode(W.getOpcode(), DL, W.getValueType(), V, W.getOperand(1));
22923 if (V.getValueType() != N.getValueType())
22924 V = DAG.getBitcast(N.getValueType(), V);
22926 // Return the new chain to replace N.
22930 /// \brief Search for a combinable shuffle across a chain ending in pshuflw or
22933 /// We walk up the chain, skipping shuffles of the other half and looking
22934 /// through shuffles which switch halves trying to find a shuffle of the same
22935 /// pair of dwords.
22936 static bool combineRedundantHalfShuffle(SDValue N, MutableArrayRef<int> Mask,
22938 TargetLowering::DAGCombinerInfo &DCI) {
22940 (N.getOpcode() == X86ISD::PSHUFLW || N.getOpcode() == X86ISD::PSHUFHW) &&
22941 "Called with something other than an x86 128-bit half shuffle!");
22943 unsigned CombineOpcode = N.getOpcode();
22945 // Walk up a single-use chain looking for a combinable shuffle.
22946 SDValue V = N.getOperand(0);
22947 for (; V.hasOneUse(); V = V.getOperand(0)) {
22948 switch (V.getOpcode()) {
22950 return false; // Nothing combined!
22953 // Skip bitcasts as we always know the type for the target specific
22957 case X86ISD::PSHUFLW:
22958 case X86ISD::PSHUFHW:
22959 if (V.getOpcode() == CombineOpcode)
22962 // Other-half shuffles are no-ops.
22965 // Break out of the loop if we break out of the switch.
22969 if (!V.hasOneUse())
22970 // We fell out of the loop without finding a viable combining instruction.
22973 // Combine away the bottom node as its shuffle will be accumulated into
22974 // a preceding shuffle.
22975 DCI.CombineTo(N.getNode(), N.getOperand(0), /*AddTo*/ true);
22977 // Record the old value.
22980 // Merge this node's mask and our incoming mask (adjusted to account for all
22981 // the pshufd instructions encountered).
22982 SmallVector<int, 4> VMask = getPSHUFShuffleMask(V);
22983 for (int &M : Mask)
22985 V = DAG.getNode(V.getOpcode(), DL, MVT::v8i16, V.getOperand(0),
22986 getV4X86ShuffleImm8ForMask(Mask, DL, DAG));
22988 // Check that the shuffles didn't cancel each other out. If not, we need to
22989 // combine to the new one.
22991 // Replace the combinable shuffle with the combined one, updating all users
22992 // so that we re-evaluate the chain here.
22993 DCI.CombineTo(Old.getNode(), V, /*AddTo*/ true);
22998 /// \brief Try to combine x86 target specific shuffles.
22999 static SDValue PerformTargetShuffleCombine(SDValue N, SelectionDAG &DAG,
23000 TargetLowering::DAGCombinerInfo &DCI,
23001 const X86Subtarget *Subtarget) {
23003 MVT VT = N.getSimpleValueType();
23004 SmallVector<int, 4> Mask;
23006 switch (N.getOpcode()) {
23007 case X86ISD::PSHUFD:
23008 case X86ISD::PSHUFLW:
23009 case X86ISD::PSHUFHW:
23010 Mask = getPSHUFShuffleMask(N);
23011 assert(Mask.size() == 4);
23013 case X86ISD::UNPCKL: {
23014 // Combine X86ISD::UNPCKL and ISD::VECTOR_SHUFFLE into X86ISD::UNPCKH, in
23015 // which X86ISD::UNPCKL has a ISD::UNDEF operand, and ISD::VECTOR_SHUFFLE
23016 // moves upper half elements into the lower half part. For example:
23018 // t2: v16i8 = vector_shuffle<8,9,10,11,12,13,14,15,u,u,u,u,u,u,u,u> t1,
23020 // t3: v16i8 = X86ISD::UNPCKL undef:v16i8, t2
23022 // will be combined to:
23024 // t3: v16i8 = X86ISD::UNPCKH undef:v16i8, t1
23026 // This is only for 128-bit vectors. From SSE4.1 onward this combine may not
23027 // happen due to advanced instructions.
23028 if (!VT.is128BitVector())
23031 auto Op0 = N.getOperand(0);
23032 auto Op1 = N.getOperand(1);
23033 if (Op0.getOpcode() == ISD::UNDEF &&
23034 Op1.getNode()->getOpcode() == ISD::VECTOR_SHUFFLE) {
23035 ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(Op1.getNode())->getMask();
23037 unsigned NumElts = VT.getVectorNumElements();
23038 SmallVector<int, 8> ExpectedMask(NumElts, -1);
23039 std::iota(ExpectedMask.begin(), ExpectedMask.begin() + NumElts / 2,
23042 auto ShufOp = Op1.getOperand(0);
23043 if (isShuffleEquivalent(Op1, ShufOp, Mask, ExpectedMask))
23044 return DAG.getNode(X86ISD::UNPCKH, DL, VT, N.getOperand(0), ShufOp);
23052 // Nuke no-op shuffles that show up after combining.
23053 if (isNoopShuffleMask(Mask))
23054 return DCI.CombineTo(N.getNode(), N.getOperand(0), /*AddTo*/ true);
23056 // Look for simplifications involving one or two shuffle instructions.
23057 SDValue V = N.getOperand(0);
23058 switch (N.getOpcode()) {
23061 case X86ISD::PSHUFLW:
23062 case X86ISD::PSHUFHW:
23063 assert(VT.getVectorElementType() == MVT::i16 && "Bad word shuffle type!");
23065 if (combineRedundantHalfShuffle(N, Mask, DAG, DCI))
23066 return SDValue(); // We combined away this shuffle, so we're done.
23068 // See if this reduces to a PSHUFD which is no more expensive and can
23069 // combine with more operations. Note that it has to at least flip the
23070 // dwords as otherwise it would have been removed as a no-op.
23071 if (makeArrayRef(Mask).equals({2, 3, 0, 1})) {
23072 int DMask[] = {0, 1, 2, 3};
23073 int DOffset = N.getOpcode() == X86ISD::PSHUFLW ? 0 : 2;
23074 DMask[DOffset + 0] = DOffset + 1;
23075 DMask[DOffset + 1] = DOffset + 0;
23076 MVT DVT = MVT::getVectorVT(MVT::i32, VT.getVectorNumElements() / 2);
23077 V = DAG.getBitcast(DVT, V);
23078 DCI.AddToWorklist(V.getNode());
23079 V = DAG.getNode(X86ISD::PSHUFD, DL, DVT, V,
23080 getV4X86ShuffleImm8ForMask(DMask, DL, DAG));
23081 DCI.AddToWorklist(V.getNode());
23082 return DAG.getBitcast(VT, V);
23085 // Look for shuffle patterns which can be implemented as a single unpack.
23086 // FIXME: This doesn't handle the location of the PSHUFD generically, and
23087 // only works when we have a PSHUFD followed by two half-shuffles.
23088 if (Mask[0] == Mask[1] && Mask[2] == Mask[3] &&
23089 (V.getOpcode() == X86ISD::PSHUFLW ||
23090 V.getOpcode() == X86ISD::PSHUFHW) &&
23091 V.getOpcode() != N.getOpcode() &&
23093 SDValue D = V.getOperand(0);
23094 while (D.getOpcode() == ISD::BITCAST && D.hasOneUse())
23095 D = D.getOperand(0);
23096 if (D.getOpcode() == X86ISD::PSHUFD && D.hasOneUse()) {
23097 SmallVector<int, 4> VMask = getPSHUFShuffleMask(V);
23098 SmallVector<int, 4> DMask = getPSHUFShuffleMask(D);
23099 int NOffset = N.getOpcode() == X86ISD::PSHUFLW ? 0 : 4;
23100 int VOffset = V.getOpcode() == X86ISD::PSHUFLW ? 0 : 4;
23102 for (int i = 0; i < 4; ++i) {
23103 WordMask[i + NOffset] = Mask[i] + NOffset;
23104 WordMask[i + VOffset] = VMask[i] + VOffset;
23106 // Map the word mask through the DWord mask.
23108 for (int i = 0; i < 8; ++i)
23109 MappedMask[i] = 2 * DMask[WordMask[i] / 2] + WordMask[i] % 2;
23110 if (makeArrayRef(MappedMask).equals({0, 0, 1, 1, 2, 2, 3, 3}) ||
23111 makeArrayRef(MappedMask).equals({4, 4, 5, 5, 6, 6, 7, 7})) {
23112 // We can replace all three shuffles with an unpack.
23113 V = DAG.getBitcast(VT, D.getOperand(0));
23114 DCI.AddToWorklist(V.getNode());
23115 return DAG.getNode(MappedMask[0] == 0 ? X86ISD::UNPCKL
23124 case X86ISD::PSHUFD:
23125 if (SDValue NewN = combineRedundantDWordShuffle(N, Mask, DAG, DCI))
23134 /// \brief Try to combine a shuffle into a target-specific add-sub node.
23136 /// We combine this directly on the abstract vector shuffle nodes so it is
23137 /// easier to generically match. We also insert dummy vector shuffle nodes for
23138 /// the operands which explicitly discard the lanes which are unused by this
23139 /// operation to try to flow through the rest of the combiner the fact that
23140 /// they're unused.
23141 static SDValue combineShuffleToAddSub(SDNode *N, SelectionDAG &DAG) {
23143 EVT VT = N->getValueType(0);
23145 // We only handle target-independent shuffles.
23146 // FIXME: It would be easy and harmless to use the target shuffle mask
23147 // extraction tool to support more.
23148 if (N->getOpcode() != ISD::VECTOR_SHUFFLE)
23151 auto *SVN = cast<ShuffleVectorSDNode>(N);
23152 SmallVector<int, 8> Mask;
23153 for (int M : SVN->getMask())
23156 SDValue V1 = N->getOperand(0);
23157 SDValue V2 = N->getOperand(1);
23159 // We require the first shuffle operand to be the FSUB node, and the second to
23160 // be the FADD node.
23161 if (V1.getOpcode() == ISD::FADD && V2.getOpcode() == ISD::FSUB) {
23162 ShuffleVectorSDNode::commuteMask(Mask);
23164 } else if (V1.getOpcode() != ISD::FSUB || V2.getOpcode() != ISD::FADD)
23167 // If there are other uses of these operations we can't fold them.
23168 if (!V1->hasOneUse() || !V2->hasOneUse())
23171 // Ensure that both operations have the same operands. Note that we can
23172 // commute the FADD operands.
23173 SDValue LHS = V1->getOperand(0), RHS = V1->getOperand(1);
23174 if ((V2->getOperand(0) != LHS || V2->getOperand(1) != RHS) &&
23175 (V2->getOperand(0) != RHS || V2->getOperand(1) != LHS))
23178 // We're looking for blends between FADD and FSUB nodes. We insist on these
23179 // nodes being lined up in a specific expected pattern.
23180 if (!(isShuffleEquivalent(V1, V2, Mask, {0, 3}) ||
23181 isShuffleEquivalent(V1, V2, Mask, {0, 5, 2, 7}) ||
23182 isShuffleEquivalent(V1, V2, Mask, {0, 9, 2, 11, 4, 13, 6, 15})))
23185 // Only specific types are legal at this point, assert so we notice if and
23186 // when these change.
23187 assert((VT == MVT::v4f32 || VT == MVT::v2f64 || VT == MVT::v8f32 ||
23188 VT == MVT::v4f64) &&
23189 "Unknown vector type encountered!");
23191 return DAG.getNode(X86ISD::ADDSUB, DL, VT, LHS, RHS);
23194 /// PerformShuffleCombine - Performs several different shuffle combines.
23195 static SDValue PerformShuffleCombine(SDNode *N, SelectionDAG &DAG,
23196 TargetLowering::DAGCombinerInfo &DCI,
23197 const X86Subtarget *Subtarget) {
23199 SDValue N0 = N->getOperand(0);
23200 SDValue N1 = N->getOperand(1);
23201 EVT VT = N->getValueType(0);
23203 // Don't create instructions with illegal types after legalize types has run.
23204 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
23205 if (!DCI.isBeforeLegalize() && !TLI.isTypeLegal(VT.getVectorElementType()))
23208 // If we have legalized the vector types, look for blends of FADD and FSUB
23209 // nodes that we can fuse into an ADDSUB node.
23210 if (TLI.isTypeLegal(VT) && Subtarget->hasSSE3())
23211 if (SDValue AddSub = combineShuffleToAddSub(N, DAG))
23214 // Combine 256-bit vector shuffles. This is only profitable when in AVX mode
23215 if (TLI.isTypeLegal(VT) && Subtarget->hasFp256() && VT.is256BitVector() &&
23216 N->getOpcode() == ISD::VECTOR_SHUFFLE)
23217 return PerformShuffleCombine256(N, DAG, DCI, Subtarget);
23219 // During Type Legalization, when promoting illegal vector types,
23220 // the backend might introduce new shuffle dag nodes and bitcasts.
23222 // This code performs the following transformation:
23223 // fold: (shuffle (bitcast (BINOP A, B)), Undef, <Mask>) ->
23224 // (shuffle (BINOP (bitcast A), (bitcast B)), Undef, <Mask>)
23226 // We do this only if both the bitcast and the BINOP dag nodes have
23227 // one use. Also, perform this transformation only if the new binary
23228 // operation is legal. This is to avoid introducing dag nodes that
23229 // potentially need to be further expanded (or custom lowered) into a
23230 // less optimal sequence of dag nodes.
23231 if (!DCI.isBeforeLegalize() && DCI.isBeforeLegalizeOps() &&
23232 N1.getOpcode() == ISD::UNDEF && N0.hasOneUse() &&
23233 N0.getOpcode() == ISD::BITCAST) {
23234 SDValue BC0 = N0.getOperand(0);
23235 EVT SVT = BC0.getValueType();
23236 unsigned Opcode = BC0.getOpcode();
23237 unsigned NumElts = VT.getVectorNumElements();
23239 if (BC0.hasOneUse() && SVT.isVector() &&
23240 SVT.getVectorNumElements() * 2 == NumElts &&
23241 TLI.isOperationLegal(Opcode, VT)) {
23242 bool CanFold = false;
23254 unsigned SVTNumElts = SVT.getVectorNumElements();
23255 ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(N);
23256 for (unsigned i = 0, e = SVTNumElts; i != e && CanFold; ++i)
23257 CanFold = SVOp->getMaskElt(i) == (int)(i * 2);
23258 for (unsigned i = SVTNumElts, e = NumElts; i != e && CanFold; ++i)
23259 CanFold = SVOp->getMaskElt(i) < 0;
23262 SDValue BC00 = DAG.getBitcast(VT, BC0.getOperand(0));
23263 SDValue BC01 = DAG.getBitcast(VT, BC0.getOperand(1));
23264 SDValue NewBinOp = DAG.getNode(BC0.getOpcode(), dl, VT, BC00, BC01);
23265 return DAG.getVectorShuffle(VT, dl, NewBinOp, N1, &SVOp->getMask()[0]);
23270 // Combine a vector_shuffle that is equal to build_vector load1, load2, load3,
23271 // load4, <0, 1, 2, 3> into a 128-bit load if the load addresses are
23272 // consecutive, non-overlapping, and in the right order.
23273 SmallVector<SDValue, 16> Elts;
23274 for (unsigned i = 0, e = VT.getVectorNumElements(); i != e; ++i)
23275 Elts.push_back(getShuffleScalarElt(N, i, DAG, 0));
23277 if (SDValue LD = EltsFromConsecutiveLoads(VT, Elts, dl, DAG, true))
23280 if (isTargetShuffle(N->getOpcode())) {
23282 PerformTargetShuffleCombine(SDValue(N, 0), DAG, DCI, Subtarget);
23283 if (Shuffle.getNode())
23286 // Try recursively combining arbitrary sequences of x86 shuffle
23287 // instructions into higher-order shuffles. We do this after combining
23288 // specific PSHUF instruction sequences into their minimal form so that we
23289 // can evaluate how many specialized shuffle instructions are involved in
23290 // a particular chain.
23291 SmallVector<int, 1> NonceMask; // Just a placeholder.
23292 NonceMask.push_back(0);
23293 if (combineX86ShufflesRecursively(SDValue(N, 0), SDValue(N, 0), NonceMask,
23294 /*Depth*/ 1, /*HasPSHUFB*/ false, DAG,
23296 return SDValue(); // This routine will use CombineTo to replace N.
23302 /// XFormVExtractWithShuffleIntoLoad - Check if a vector extract from a target
23303 /// specific shuffle of a load can be folded into a single element load.
23304 /// Similar handling for VECTOR_SHUFFLE is performed by DAGCombiner, but
23305 /// shuffles have been custom lowered so we need to handle those here.
23306 static SDValue XFormVExtractWithShuffleIntoLoad(SDNode *N, SelectionDAG &DAG,
23307 TargetLowering::DAGCombinerInfo &DCI) {
23308 if (DCI.isBeforeLegalizeOps())
23311 SDValue InVec = N->getOperand(0);
23312 SDValue EltNo = N->getOperand(1);
23314 if (!isa<ConstantSDNode>(EltNo))
23317 EVT OriginalVT = InVec.getValueType();
23319 if (InVec.getOpcode() == ISD::BITCAST) {
23320 // Don't duplicate a load with other uses.
23321 if (!InVec.hasOneUse())
23323 EVT BCVT = InVec.getOperand(0).getValueType();
23324 if (!BCVT.isVector() ||
23325 BCVT.getVectorNumElements() != OriginalVT.getVectorNumElements())
23327 InVec = InVec.getOperand(0);
23330 EVT CurrentVT = InVec.getValueType();
23332 if (!isTargetShuffle(InVec.getOpcode()))
23335 // Don't duplicate a load with other uses.
23336 if (!InVec.hasOneUse())
23339 SmallVector<int, 16> ShuffleMask;
23341 if (!getTargetShuffleMask(InVec.getNode(), CurrentVT.getSimpleVT(),
23342 ShuffleMask, UnaryShuffle))
23345 // Select the input vector, guarding against out of range extract vector.
23346 unsigned NumElems = CurrentVT.getVectorNumElements();
23347 int Elt = cast<ConstantSDNode>(EltNo)->getZExtValue();
23348 int Idx = (Elt > (int)NumElems) ? -1 : ShuffleMask[Elt];
23349 SDValue LdNode = (Idx < (int)NumElems) ? InVec.getOperand(0)
23350 : InVec.getOperand(1);
23352 // If inputs to shuffle are the same for both ops, then allow 2 uses
23353 unsigned AllowedUses = InVec.getNumOperands() > 1 &&
23354 InVec.getOperand(0) == InVec.getOperand(1) ? 2 : 1;
23356 if (LdNode.getOpcode() == ISD::BITCAST) {
23357 // Don't duplicate a load with other uses.
23358 if (!LdNode.getNode()->hasNUsesOfValue(AllowedUses, 0))
23361 AllowedUses = 1; // only allow 1 load use if we have a bitcast
23362 LdNode = LdNode.getOperand(0);
23365 if (!ISD::isNormalLoad(LdNode.getNode()))
23368 LoadSDNode *LN0 = cast<LoadSDNode>(LdNode);
23370 if (!LN0 ||!LN0->hasNUsesOfValue(AllowedUses, 0) || LN0->isVolatile())
23373 EVT EltVT = N->getValueType(0);
23374 // If there's a bitcast before the shuffle, check if the load type and
23375 // alignment is valid.
23376 unsigned Align = LN0->getAlignment();
23377 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
23378 unsigned NewAlign = DAG.getDataLayout().getABITypeAlignment(
23379 EltVT.getTypeForEVT(*DAG.getContext()));
23381 if (NewAlign > Align || !TLI.isOperationLegalOrCustom(ISD::LOAD, EltVT))
23384 // All checks match so transform back to vector_shuffle so that DAG combiner
23385 // can finish the job
23388 // Create shuffle node taking into account the case that its a unary shuffle
23389 SDValue Shuffle = (UnaryShuffle) ? DAG.getUNDEF(CurrentVT)
23390 : InVec.getOperand(1);
23391 Shuffle = DAG.getVectorShuffle(CurrentVT, dl,
23392 InVec.getOperand(0), Shuffle,
23394 Shuffle = DAG.getBitcast(OriginalVT, Shuffle);
23395 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, N->getValueType(0), Shuffle,
23399 static SDValue PerformBITCASTCombine(SDNode *N, SelectionDAG &DAG,
23400 const X86Subtarget *Subtarget) {
23401 SDValue N0 = N->getOperand(0);
23402 EVT VT = N->getValueType(0);
23404 // Detect bitcasts between i32 to x86mmx low word. Since MMX types are
23405 // special and don't usually play with other vector types, it's better to
23406 // handle them early to be sure we emit efficient code by avoiding
23407 // store-load conversions.
23408 if (VT == MVT::x86mmx && N0.getOpcode() == ISD::BUILD_VECTOR &&
23409 N0.getValueType() == MVT::v2i32 &&
23410 isNullConstant(N0.getOperand(1))) {
23411 SDValue N00 = N0->getOperand(0);
23412 if (N00.getValueType() == MVT::i32)
23413 return DAG.getNode(X86ISD::MMX_MOVW2D, SDLoc(N00), VT, N00);
23416 // Convert a bitcasted integer logic operation that has one bitcasted
23417 // floating-point operand and one constant operand into a floating-point
23418 // logic operation. This may create a load of the constant, but that is
23419 // cheaper than materializing the constant in an integer register and
23420 // transferring it to an SSE register or transferring the SSE operand to
23421 // integer register and back.
23423 switch (N0.getOpcode()) {
23424 case ISD::AND: FPOpcode = X86ISD::FAND; break;
23425 case ISD::OR: FPOpcode = X86ISD::FOR; break;
23426 case ISD::XOR: FPOpcode = X86ISD::FXOR; break;
23427 default: return SDValue();
23429 if (((Subtarget->hasSSE1() && VT == MVT::f32) ||
23430 (Subtarget->hasSSE2() && VT == MVT::f64)) &&
23431 isa<ConstantSDNode>(N0.getOperand(1)) &&
23432 N0.getOperand(0).getOpcode() == ISD::BITCAST &&
23433 N0.getOperand(0).getOperand(0).getValueType() == VT) {
23434 SDValue N000 = N0.getOperand(0).getOperand(0);
23435 SDValue FPConst = DAG.getBitcast(VT, N0.getOperand(1));
23436 return DAG.getNode(FPOpcode, SDLoc(N0), VT, N000, FPConst);
23442 /// PerformEXTRACT_VECTOR_ELTCombine - Detect vector gather/scatter index
23443 /// generation and convert it from being a bunch of shuffles and extracts
23444 /// into a somewhat faster sequence. For i686, the best sequence is apparently
23445 /// storing the value and loading scalars back, while for x64 we should
23446 /// use 64-bit extracts and shifts.
23447 static SDValue PerformEXTRACT_VECTOR_ELTCombine(SDNode *N, SelectionDAG &DAG,
23448 TargetLowering::DAGCombinerInfo &DCI) {
23449 if (SDValue NewOp = XFormVExtractWithShuffleIntoLoad(N, DAG, DCI))
23452 SDValue InputVector = N->getOperand(0);
23453 SDLoc dl(InputVector);
23454 // Detect mmx to i32 conversion through a v2i32 elt extract.
23455 if (InputVector.getOpcode() == ISD::BITCAST && InputVector.hasOneUse() &&
23456 N->getValueType(0) == MVT::i32 &&
23457 InputVector.getValueType() == MVT::v2i32) {
23459 // The bitcast source is a direct mmx result.
23460 SDValue MMXSrc = InputVector.getNode()->getOperand(0);
23461 if (MMXSrc.getValueType() == MVT::x86mmx)
23462 return DAG.getNode(X86ISD::MMX_MOVD2W, SDLoc(InputVector),
23463 N->getValueType(0),
23464 InputVector.getNode()->getOperand(0));
23466 // The mmx is indirect: (i64 extract_elt (v1i64 bitcast (x86mmx ...))).
23467 if (MMXSrc.getOpcode() == ISD::EXTRACT_VECTOR_ELT && MMXSrc.hasOneUse() &&
23468 MMXSrc.getValueType() == MVT::i64) {
23469 SDValue MMXSrcOp = MMXSrc.getOperand(0);
23470 if (MMXSrcOp.hasOneUse() && MMXSrcOp.getOpcode() == ISD::BITCAST &&
23471 MMXSrcOp.getValueType() == MVT::v1i64 &&
23472 MMXSrcOp.getOperand(0).getValueType() == MVT::x86mmx)
23473 return DAG.getNode(X86ISD::MMX_MOVD2W, SDLoc(InputVector),
23474 N->getValueType(0), MMXSrcOp.getOperand(0));
23478 EVT VT = N->getValueType(0);
23480 if (VT == MVT::i1 && isa<ConstantSDNode>(N->getOperand(1)) &&
23481 InputVector.getOpcode() == ISD::BITCAST &&
23482 isa<ConstantSDNode>(InputVector.getOperand(0))) {
23483 uint64_t ExtractedElt =
23484 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
23485 uint64_t InputValue =
23486 cast<ConstantSDNode>(InputVector.getOperand(0))->getZExtValue();
23487 uint64_t Res = (InputValue >> ExtractedElt) & 1;
23488 return DAG.getConstant(Res, dl, MVT::i1);
23490 // Only operate on vectors of 4 elements, where the alternative shuffling
23491 // gets to be more expensive.
23492 if (InputVector.getValueType() != MVT::v4i32)
23495 // Check whether every use of InputVector is an EXTRACT_VECTOR_ELT with a
23496 // single use which is a sign-extend or zero-extend, and all elements are
23498 SmallVector<SDNode *, 4> Uses;
23499 unsigned ExtractedElements = 0;
23500 for (SDNode::use_iterator UI = InputVector.getNode()->use_begin(),
23501 UE = InputVector.getNode()->use_end(); UI != UE; ++UI) {
23502 if (UI.getUse().getResNo() != InputVector.getResNo())
23505 SDNode *Extract = *UI;
23506 if (Extract->getOpcode() != ISD::EXTRACT_VECTOR_ELT)
23509 if (Extract->getValueType(0) != MVT::i32)
23511 if (!Extract->hasOneUse())
23513 if (Extract->use_begin()->getOpcode() != ISD::SIGN_EXTEND &&
23514 Extract->use_begin()->getOpcode() != ISD::ZERO_EXTEND)
23516 if (!isa<ConstantSDNode>(Extract->getOperand(1)))
23519 // Record which element was extracted.
23520 ExtractedElements |=
23521 1 << cast<ConstantSDNode>(Extract->getOperand(1))->getZExtValue();
23523 Uses.push_back(Extract);
23526 // If not all the elements were used, this may not be worthwhile.
23527 if (ExtractedElements != 15)
23530 // Ok, we've now decided to do the transformation.
23531 // If 64-bit shifts are legal, use the extract-shift sequence,
23532 // otherwise bounce the vector off the cache.
23533 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
23536 if (TLI.isOperationLegal(ISD::SRA, MVT::i64)) {
23537 SDValue Cst = DAG.getBitcast(MVT::v2i64, InputVector);
23538 auto &DL = DAG.getDataLayout();
23539 EVT VecIdxTy = DAG.getTargetLoweringInfo().getVectorIdxTy(DL);
23540 SDValue BottomHalf = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i64, Cst,
23541 DAG.getConstant(0, dl, VecIdxTy));
23542 SDValue TopHalf = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i64, Cst,
23543 DAG.getConstant(1, dl, VecIdxTy));
23545 SDValue ShAmt = DAG.getConstant(
23546 32, dl, DAG.getTargetLoweringInfo().getShiftAmountTy(MVT::i64, DL));
23547 Vals[0] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, BottomHalf);
23548 Vals[1] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32,
23549 DAG.getNode(ISD::SRA, dl, MVT::i64, BottomHalf, ShAmt));
23550 Vals[2] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, TopHalf);
23551 Vals[3] = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32,
23552 DAG.getNode(ISD::SRA, dl, MVT::i64, TopHalf, ShAmt));
23554 // Store the value to a temporary stack slot.
23555 SDValue StackPtr = DAG.CreateStackTemporary(InputVector.getValueType());
23556 SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, InputVector, StackPtr,
23557 MachinePointerInfo(), false, false, 0);
23559 EVT ElementType = InputVector.getValueType().getVectorElementType();
23560 unsigned EltSize = ElementType.getSizeInBits() / 8;
23562 // Replace each use (extract) with a load of the appropriate element.
23563 for (unsigned i = 0; i < 4; ++i) {
23564 uint64_t Offset = EltSize * i;
23565 auto PtrVT = TLI.getPointerTy(DAG.getDataLayout());
23566 SDValue OffsetVal = DAG.getConstant(Offset, dl, PtrVT);
23568 SDValue ScalarAddr =
23569 DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, OffsetVal);
23571 // Load the scalar.
23572 Vals[i] = DAG.getLoad(ElementType, dl, Ch,
23573 ScalarAddr, MachinePointerInfo(),
23574 false, false, false, 0);
23579 // Replace the extracts
23580 for (SmallVectorImpl<SDNode *>::iterator UI = Uses.begin(),
23581 UE = Uses.end(); UI != UE; ++UI) {
23582 SDNode *Extract = *UI;
23584 SDValue Idx = Extract->getOperand(1);
23585 uint64_t IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
23586 DAG.ReplaceAllUsesOfValueWith(SDValue(Extract, 0), Vals[IdxVal]);
23589 // The replacement was made in place; don't return anything.
23594 transformVSELECTtoBlendVECTOR_SHUFFLE(SDNode *N, SelectionDAG &DAG,
23595 const X86Subtarget *Subtarget) {
23597 SDValue Cond = N->getOperand(0);
23598 SDValue LHS = N->getOperand(1);
23599 SDValue RHS = N->getOperand(2);
23601 if (Cond.getOpcode() == ISD::SIGN_EXTEND) {
23602 SDValue CondSrc = Cond->getOperand(0);
23603 if (CondSrc->getOpcode() == ISD::SIGN_EXTEND_INREG)
23604 Cond = CondSrc->getOperand(0);
23607 if (!ISD::isBuildVectorOfConstantSDNodes(Cond.getNode()))
23610 // A vselect where all conditions and data are constants can be optimized into
23611 // a single vector load by SelectionDAGLegalize::ExpandBUILD_VECTOR().
23612 if (ISD::isBuildVectorOfConstantSDNodes(LHS.getNode()) &&
23613 ISD::isBuildVectorOfConstantSDNodes(RHS.getNode()))
23616 unsigned MaskValue = 0;
23617 if (!BUILD_VECTORtoBlendMask(cast<BuildVectorSDNode>(Cond), MaskValue))
23620 MVT VT = N->getSimpleValueType(0);
23621 unsigned NumElems = VT.getVectorNumElements();
23622 SmallVector<int, 8> ShuffleMask(NumElems, -1);
23623 for (unsigned i = 0; i < NumElems; ++i) {
23624 // Be sure we emit undef where we can.
23625 if (Cond.getOperand(i)->getOpcode() == ISD::UNDEF)
23626 ShuffleMask[i] = -1;
23628 ShuffleMask[i] = i + NumElems * ((MaskValue >> i) & 1);
23631 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
23632 if (!TLI.isShuffleMaskLegal(ShuffleMask, VT))
23634 return DAG.getVectorShuffle(VT, dl, LHS, RHS, &ShuffleMask[0]);
23637 /// PerformSELECTCombine - Do target-specific dag combines on SELECT and VSELECT
23639 static SDValue PerformSELECTCombine(SDNode *N, SelectionDAG &DAG,
23640 TargetLowering::DAGCombinerInfo &DCI,
23641 const X86Subtarget *Subtarget) {
23643 SDValue Cond = N->getOperand(0);
23644 // Get the LHS/RHS of the select.
23645 SDValue LHS = N->getOperand(1);
23646 SDValue RHS = N->getOperand(2);
23647 EVT VT = LHS.getValueType();
23648 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
23650 // If we have SSE[12] support, try to form min/max nodes. SSE min/max
23651 // instructions match the semantics of the common C idiom x<y?x:y but not
23652 // x<=y?x:y, because of how they handle negative zero (which can be
23653 // ignored in unsafe-math mode).
23654 // We also try to create v2f32 min/max nodes, which we later widen to v4f32.
23655 if (Cond.getOpcode() == ISD::SETCC && VT.isFloatingPoint() &&
23656 VT != MVT::f80 && (TLI.isTypeLegal(VT) || VT == MVT::v2f32) &&
23657 (Subtarget->hasSSE2() ||
23658 (Subtarget->hasSSE1() && VT.getScalarType() == MVT::f32))) {
23659 ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
23661 unsigned Opcode = 0;
23662 // Check for x CC y ? x : y.
23663 if (DAG.isEqualTo(LHS, Cond.getOperand(0)) &&
23664 DAG.isEqualTo(RHS, Cond.getOperand(1))) {
23668 // Converting this to a min would handle NaNs incorrectly, and swapping
23669 // the operands would cause it to handle comparisons between positive
23670 // and negative zero incorrectly.
23671 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)) {
23672 if (!DAG.getTarget().Options.UnsafeFPMath &&
23673 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
23675 std::swap(LHS, RHS);
23677 Opcode = X86ISD::FMIN;
23680 // Converting this to a min would handle comparisons between positive
23681 // and negative zero incorrectly.
23682 if (!DAG.getTarget().Options.UnsafeFPMath &&
23683 !DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS))
23685 Opcode = X86ISD::FMIN;
23688 // Converting this to a min would handle both negative zeros and NaNs
23689 // incorrectly, but we can swap the operands to fix both.
23690 std::swap(LHS, RHS);
23694 Opcode = X86ISD::FMIN;
23698 // Converting this to a max would handle comparisons between positive
23699 // and negative zero incorrectly.
23700 if (!DAG.getTarget().Options.UnsafeFPMath &&
23701 !DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS))
23703 Opcode = X86ISD::FMAX;
23706 // Converting this to a max would handle NaNs incorrectly, and swapping
23707 // the operands would cause it to handle comparisons between positive
23708 // and negative zero incorrectly.
23709 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)) {
23710 if (!DAG.getTarget().Options.UnsafeFPMath &&
23711 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
23713 std::swap(LHS, RHS);
23715 Opcode = X86ISD::FMAX;
23718 // Converting this to a max would handle both negative zeros and NaNs
23719 // incorrectly, but we can swap the operands to fix both.
23720 std::swap(LHS, RHS);
23724 Opcode = X86ISD::FMAX;
23727 // Check for x CC y ? y : x -- a min/max with reversed arms.
23728 } else if (DAG.isEqualTo(LHS, Cond.getOperand(1)) &&
23729 DAG.isEqualTo(RHS, Cond.getOperand(0))) {
23733 // Converting this to a min would handle comparisons between positive
23734 // and negative zero incorrectly, and swapping the operands would
23735 // cause it to handle NaNs incorrectly.
23736 if (!DAG.getTarget().Options.UnsafeFPMath &&
23737 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS))) {
23738 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
23740 std::swap(LHS, RHS);
23742 Opcode = X86ISD::FMIN;
23745 // Converting this to a min would handle NaNs incorrectly.
23746 if (!DAG.getTarget().Options.UnsafeFPMath &&
23747 (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS)))
23749 Opcode = X86ISD::FMIN;
23752 // Converting this to a min would handle both negative zeros and NaNs
23753 // incorrectly, but we can swap the operands to fix both.
23754 std::swap(LHS, RHS);
23758 Opcode = X86ISD::FMIN;
23762 // Converting this to a max would handle NaNs incorrectly.
23763 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
23765 Opcode = X86ISD::FMAX;
23768 // Converting this to a max would handle comparisons between positive
23769 // and negative zero incorrectly, and swapping the operands would
23770 // cause it to handle NaNs incorrectly.
23771 if (!DAG.getTarget().Options.UnsafeFPMath &&
23772 !DAG.isKnownNeverZero(LHS) && !DAG.isKnownNeverZero(RHS)) {
23773 if (!DAG.isKnownNeverNaN(LHS) || !DAG.isKnownNeverNaN(RHS))
23775 std::swap(LHS, RHS);
23777 Opcode = X86ISD::FMAX;
23780 // Converting this to a max would handle both negative zeros and NaNs
23781 // incorrectly, but we can swap the operands to fix both.
23782 std::swap(LHS, RHS);
23786 Opcode = X86ISD::FMAX;
23792 return DAG.getNode(Opcode, DL, N->getValueType(0), LHS, RHS);
23795 EVT CondVT = Cond.getValueType();
23796 if (Subtarget->hasAVX512() && VT.isVector() && CondVT.isVector() &&
23797 CondVT.getVectorElementType() == MVT::i1) {
23798 // v16i8 (select v16i1, v16i8, v16i8) does not have a proper
23799 // lowering on KNL. In this case we convert it to
23800 // v16i8 (select v16i8, v16i8, v16i8) and use AVX instruction.
23801 // The same situation for all 128 and 256-bit vectors of i8 and i16.
23802 // Since SKX these selects have a proper lowering.
23803 EVT OpVT = LHS.getValueType();
23804 if ((OpVT.is128BitVector() || OpVT.is256BitVector()) &&
23805 (OpVT.getVectorElementType() == MVT::i8 ||
23806 OpVT.getVectorElementType() == MVT::i16) &&
23807 !(Subtarget->hasBWI() && Subtarget->hasVLX())) {
23808 Cond = DAG.getNode(ISD::SIGN_EXTEND, DL, OpVT, Cond);
23809 DCI.AddToWorklist(Cond.getNode());
23810 return DAG.getNode(N->getOpcode(), DL, OpVT, Cond, LHS, RHS);
23813 // If this is a select between two integer constants, try to do some
23815 if (ConstantSDNode *TrueC = dyn_cast<ConstantSDNode>(LHS)) {
23816 if (ConstantSDNode *FalseC = dyn_cast<ConstantSDNode>(RHS))
23817 // Don't do this for crazy integer types.
23818 if (DAG.getTargetLoweringInfo().isTypeLegal(LHS.getValueType())) {
23819 // If this is efficiently invertible, canonicalize the LHSC/RHSC values
23820 // so that TrueC (the true value) is larger than FalseC.
23821 bool NeedsCondInvert = false;
23823 if (TrueC->getAPIntValue().ult(FalseC->getAPIntValue()) &&
23824 // Efficiently invertible.
23825 (Cond.getOpcode() == ISD::SETCC || // setcc -> invertible.
23826 (Cond.getOpcode() == ISD::XOR && // xor(X, C) -> invertible.
23827 isa<ConstantSDNode>(Cond.getOperand(1))))) {
23828 NeedsCondInvert = true;
23829 std::swap(TrueC, FalseC);
23832 // Optimize C ? 8 : 0 -> zext(C) << 3. Likewise for any pow2/0.
23833 if (FalseC->getAPIntValue() == 0 &&
23834 TrueC->getAPIntValue().isPowerOf2()) {
23835 if (NeedsCondInvert) // Invert the condition if needed.
23836 Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
23837 DAG.getConstant(1, DL, Cond.getValueType()));
23839 // Zero extend the condition if needed.
23840 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, LHS.getValueType(), Cond);
23842 unsigned ShAmt = TrueC->getAPIntValue().logBase2();
23843 return DAG.getNode(ISD::SHL, DL, LHS.getValueType(), Cond,
23844 DAG.getConstant(ShAmt, DL, MVT::i8));
23847 // Optimize Cond ? cst+1 : cst -> zext(setcc(C)+cst.
23848 if (FalseC->getAPIntValue()+1 == TrueC->getAPIntValue()) {
23849 if (NeedsCondInvert) // Invert the condition if needed.
23850 Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
23851 DAG.getConstant(1, DL, Cond.getValueType()));
23853 // Zero extend the condition if needed.
23854 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL,
23855 FalseC->getValueType(0), Cond);
23856 return DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
23857 SDValue(FalseC, 0));
23860 // Optimize cases that will turn into an LEA instruction. This requires
23861 // an i32 or i64 and an efficient multiplier (1, 2, 3, 4, 5, 8, 9).
23862 if (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i64) {
23863 uint64_t Diff = TrueC->getZExtValue()-FalseC->getZExtValue();
23864 if (N->getValueType(0) == MVT::i32) Diff = (unsigned)Diff;
23866 bool isFastMultiplier = false;
23868 switch ((unsigned char)Diff) {
23870 case 1: // result = add base, cond
23871 case 2: // result = lea base( , cond*2)
23872 case 3: // result = lea base(cond, cond*2)
23873 case 4: // result = lea base( , cond*4)
23874 case 5: // result = lea base(cond, cond*4)
23875 case 8: // result = lea base( , cond*8)
23876 case 9: // result = lea base(cond, cond*8)
23877 isFastMultiplier = true;
23882 if (isFastMultiplier) {
23883 APInt Diff = TrueC->getAPIntValue()-FalseC->getAPIntValue();
23884 if (NeedsCondInvert) // Invert the condition if needed.
23885 Cond = DAG.getNode(ISD::XOR, DL, Cond.getValueType(), Cond,
23886 DAG.getConstant(1, DL, Cond.getValueType()));
23888 // Zero extend the condition if needed.
23889 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, FalseC->getValueType(0),
23891 // Scale the condition by the difference.
23893 Cond = DAG.getNode(ISD::MUL, DL, Cond.getValueType(), Cond,
23894 DAG.getConstant(Diff, DL,
23895 Cond.getValueType()));
23897 // Add the base if non-zero.
23898 if (FalseC->getAPIntValue() != 0)
23899 Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
23900 SDValue(FalseC, 0));
23907 // Canonicalize max and min:
23908 // (x > y) ? x : y -> (x >= y) ? x : y
23909 // (x < y) ? x : y -> (x <= y) ? x : y
23910 // This allows use of COND_S / COND_NS (see TranslateX86CC) which eliminates
23911 // the need for an extra compare
23912 // against zero. e.g.
23913 // (x - y) > 0 : (x - y) ? 0 -> (x - y) >= 0 : (x - y) ? 0
23915 // testl %edi, %edi
23917 // cmovgl %edi, %eax
23921 // cmovsl %eax, %edi
23922 if (N->getOpcode() == ISD::SELECT && Cond.getOpcode() == ISD::SETCC &&
23923 DAG.isEqualTo(LHS, Cond.getOperand(0)) &&
23924 DAG.isEqualTo(RHS, Cond.getOperand(1))) {
23925 ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
23930 ISD::CondCode NewCC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGE;
23931 Cond = DAG.getSetCC(SDLoc(Cond), Cond.getValueType(),
23932 Cond.getOperand(0), Cond.getOperand(1), NewCC);
23933 return DAG.getNode(ISD::SELECT, DL, VT, Cond, LHS, RHS);
23938 // Early exit check
23939 if (!TLI.isTypeLegal(VT))
23942 // Match VSELECTs into subs with unsigned saturation.
23943 if (N->getOpcode() == ISD::VSELECT && Cond.getOpcode() == ISD::SETCC &&
23944 // psubus is available in SSE2 and AVX2 for i8 and i16 vectors.
23945 ((Subtarget->hasSSE2() && (VT == MVT::v16i8 || VT == MVT::v8i16)) ||
23946 (Subtarget->hasAVX2() && (VT == MVT::v32i8 || VT == MVT::v16i16)))) {
23947 ISD::CondCode CC = cast<CondCodeSDNode>(Cond.getOperand(2))->get();
23949 // Check if one of the arms of the VSELECT is a zero vector. If it's on the
23950 // left side invert the predicate to simplify logic below.
23952 if (ISD::isBuildVectorAllZeros(LHS.getNode())) {
23954 CC = ISD::getSetCCInverse(CC, true);
23955 } else if (ISD::isBuildVectorAllZeros(RHS.getNode())) {
23959 if (Other.getNode() && Other->getNumOperands() == 2 &&
23960 DAG.isEqualTo(Other->getOperand(0), Cond.getOperand(0))) {
23961 SDValue OpLHS = Other->getOperand(0), OpRHS = Other->getOperand(1);
23962 SDValue CondRHS = Cond->getOperand(1);
23964 // Look for a general sub with unsigned saturation first.
23965 // x >= y ? x-y : 0 --> subus x, y
23966 // x > y ? x-y : 0 --> subus x, y
23967 if ((CC == ISD::SETUGE || CC == ISD::SETUGT) &&
23968 Other->getOpcode() == ISD::SUB && DAG.isEqualTo(OpRHS, CondRHS))
23969 return DAG.getNode(X86ISD::SUBUS, DL, VT, OpLHS, OpRHS);
23971 if (auto *OpRHSBV = dyn_cast<BuildVectorSDNode>(OpRHS))
23972 if (auto *OpRHSConst = OpRHSBV->getConstantSplatNode()) {
23973 if (auto *CondRHSBV = dyn_cast<BuildVectorSDNode>(CondRHS))
23974 if (auto *CondRHSConst = CondRHSBV->getConstantSplatNode())
23975 // If the RHS is a constant we have to reverse the const
23976 // canonicalization.
23977 // x > C-1 ? x+-C : 0 --> subus x, C
23978 if (CC == ISD::SETUGT && Other->getOpcode() == ISD::ADD &&
23979 CondRHSConst->getAPIntValue() ==
23980 (-OpRHSConst->getAPIntValue() - 1))
23981 return DAG.getNode(
23982 X86ISD::SUBUS, DL, VT, OpLHS,
23983 DAG.getConstant(-OpRHSConst->getAPIntValue(), DL, VT));
23985 // Another special case: If C was a sign bit, the sub has been
23986 // canonicalized into a xor.
23987 // FIXME: Would it be better to use computeKnownBits to determine
23988 // whether it's safe to decanonicalize the xor?
23989 // x s< 0 ? x^C : 0 --> subus x, C
23990 if (CC == ISD::SETLT && Other->getOpcode() == ISD::XOR &&
23991 ISD::isBuildVectorAllZeros(CondRHS.getNode()) &&
23992 OpRHSConst->getAPIntValue().isSignBit())
23993 // Note that we have to rebuild the RHS constant here to ensure we
23994 // don't rely on particular values of undef lanes.
23995 return DAG.getNode(
23996 X86ISD::SUBUS, DL, VT, OpLHS,
23997 DAG.getConstant(OpRHSConst->getAPIntValue(), DL, VT));
24002 // Simplify vector selection if condition value type matches vselect
24004 if (N->getOpcode() == ISD::VSELECT && CondVT == VT) {
24005 assert(Cond.getValueType().isVector() &&
24006 "vector select expects a vector selector!");
24008 bool TValIsAllOnes = ISD::isBuildVectorAllOnes(LHS.getNode());
24009 bool FValIsAllZeros = ISD::isBuildVectorAllZeros(RHS.getNode());
24011 // Try invert the condition if true value is not all 1s and false value
24013 if (!TValIsAllOnes && !FValIsAllZeros &&
24014 // Check if the selector will be produced by CMPP*/PCMP*
24015 Cond.getOpcode() == ISD::SETCC &&
24016 // Check if SETCC has already been promoted
24017 TLI.getSetCCResultType(DAG.getDataLayout(), *DAG.getContext(), VT) ==
24019 bool TValIsAllZeros = ISD::isBuildVectorAllZeros(LHS.getNode());
24020 bool FValIsAllOnes = ISD::isBuildVectorAllOnes(RHS.getNode());
24022 if (TValIsAllZeros || FValIsAllOnes) {
24023 SDValue CC = Cond.getOperand(2);
24024 ISD::CondCode NewCC =
24025 ISD::getSetCCInverse(cast<CondCodeSDNode>(CC)->get(),
24026 Cond.getOperand(0).getValueType().isInteger());
24027 Cond = DAG.getSetCC(DL, CondVT, Cond.getOperand(0), Cond.getOperand(1), NewCC);
24028 std::swap(LHS, RHS);
24029 TValIsAllOnes = FValIsAllOnes;
24030 FValIsAllZeros = TValIsAllZeros;
24034 if (TValIsAllOnes || FValIsAllZeros) {
24037 if (TValIsAllOnes && FValIsAllZeros)
24039 else if (TValIsAllOnes)
24041 DAG.getNode(ISD::OR, DL, CondVT, Cond, DAG.getBitcast(CondVT, RHS));
24042 else if (FValIsAllZeros)
24043 Ret = DAG.getNode(ISD::AND, DL, CondVT, Cond,
24044 DAG.getBitcast(CondVT, LHS));
24046 return DAG.getBitcast(VT, Ret);
24050 // We should generate an X86ISD::BLENDI from a vselect if its argument
24051 // is a sign_extend_inreg of an any_extend of a BUILD_VECTOR of
24052 // constants. This specific pattern gets generated when we split a
24053 // selector for a 512 bit vector in a machine without AVX512 (but with
24054 // 256-bit vectors), during legalization:
24056 // (vselect (sign_extend (any_extend (BUILD_VECTOR)) i1) LHS RHS)
24058 // Iff we find this pattern and the build_vectors are built from
24059 // constants, we translate the vselect into a shuffle_vector that we
24060 // know will be matched by LowerVECTOR_SHUFFLEtoBlend.
24061 if ((N->getOpcode() == ISD::VSELECT ||
24062 N->getOpcode() == X86ISD::SHRUNKBLEND) &&
24063 !DCI.isBeforeLegalize() && !VT.is512BitVector()) {
24064 SDValue Shuffle = transformVSELECTtoBlendVECTOR_SHUFFLE(N, DAG, Subtarget);
24065 if (Shuffle.getNode())
24069 // If this is a *dynamic* select (non-constant condition) and we can match
24070 // this node with one of the variable blend instructions, restructure the
24071 // condition so that the blends can use the high bit of each element and use
24072 // SimplifyDemandedBits to simplify the condition operand.
24073 if (N->getOpcode() == ISD::VSELECT && DCI.isBeforeLegalizeOps() &&
24074 !DCI.isBeforeLegalize() &&
24075 !ISD::isBuildVectorOfConstantSDNodes(Cond.getNode())) {
24076 unsigned BitWidth = Cond.getValueType().getScalarSizeInBits();
24078 // Don't optimize vector selects that map to mask-registers.
24082 // We can only handle the cases where VSELECT is directly legal on the
24083 // subtarget. We custom lower VSELECT nodes with constant conditions and
24084 // this makes it hard to see whether a dynamic VSELECT will correctly
24085 // lower, so we both check the operation's status and explicitly handle the
24086 // cases where a *dynamic* blend will fail even though a constant-condition
24087 // blend could be custom lowered.
24088 // FIXME: We should find a better way to handle this class of problems.
24089 // Potentially, we should combine constant-condition vselect nodes
24090 // pre-legalization into shuffles and not mark as many types as custom
24092 if (!TLI.isOperationLegalOrCustom(ISD::VSELECT, VT))
24094 // FIXME: We don't support i16-element blends currently. We could and
24095 // should support them by making *all* the bits in the condition be set
24096 // rather than just the high bit and using an i8-element blend.
24097 if (VT.getVectorElementType() == MVT::i16)
24099 // Dynamic blending was only available from SSE4.1 onward.
24100 if (VT.is128BitVector() && !Subtarget->hasSSE41())
24102 // Byte blends are only available in AVX2
24103 if (VT == MVT::v32i8 && !Subtarget->hasAVX2())
24106 assert(BitWidth >= 8 && BitWidth <= 64 && "Invalid mask size");
24107 APInt DemandedMask = APInt::getHighBitsSet(BitWidth, 1);
24109 APInt KnownZero, KnownOne;
24110 TargetLowering::TargetLoweringOpt TLO(DAG, DCI.isBeforeLegalize(),
24111 DCI.isBeforeLegalizeOps());
24112 if (TLO.ShrinkDemandedConstant(Cond, DemandedMask) ||
24113 TLI.SimplifyDemandedBits(Cond, DemandedMask, KnownZero, KnownOne,
24115 // If we changed the computation somewhere in the DAG, this change
24116 // will affect all users of Cond.
24117 // Make sure it is fine and update all the nodes so that we do not
24118 // use the generic VSELECT anymore. Otherwise, we may perform
24119 // wrong optimizations as we messed up with the actual expectation
24120 // for the vector boolean values.
24121 if (Cond != TLO.Old) {
24122 // Check all uses of that condition operand to check whether it will be
24123 // consumed by non-BLEND instructions, which may depend on all bits are
24125 for (SDNode::use_iterator I = Cond->use_begin(), E = Cond->use_end();
24127 if (I->getOpcode() != ISD::VSELECT)
24128 // TODO: Add other opcodes eventually lowered into BLEND.
24131 // Update all the users of the condition, before committing the change,
24132 // so that the VSELECT optimizations that expect the correct vector
24133 // boolean value will not be triggered.
24134 for (SDNode::use_iterator I = Cond->use_begin(), E = Cond->use_end();
24136 DAG.ReplaceAllUsesOfValueWith(
24138 DAG.getNode(X86ISD::SHRUNKBLEND, SDLoc(*I), I->getValueType(0),
24139 Cond, I->getOperand(1), I->getOperand(2)));
24140 DCI.CommitTargetLoweringOpt(TLO);
24143 // At this point, only Cond is changed. Change the condition
24144 // just for N to keep the opportunity to optimize all other
24145 // users their own way.
24146 DAG.ReplaceAllUsesOfValueWith(
24148 DAG.getNode(X86ISD::SHRUNKBLEND, SDLoc(N), N->getValueType(0),
24149 TLO.New, N->getOperand(1), N->getOperand(2)));
24157 // Check whether a boolean test is testing a boolean value generated by
24158 // X86ISD::SETCC. If so, return the operand of that SETCC and proper condition
24161 // Simplify the following patterns:
24162 // (Op (CMP (SETCC Cond EFLAGS) 1) EQ) or
24163 // (Op (CMP (SETCC Cond EFLAGS) 0) NEQ)
24164 // to (Op EFLAGS Cond)
24166 // (Op (CMP (SETCC Cond EFLAGS) 0) EQ) or
24167 // (Op (CMP (SETCC Cond EFLAGS) 1) NEQ)
24168 // to (Op EFLAGS !Cond)
24170 // where Op could be BRCOND or CMOV.
24172 static SDValue checkBoolTestSetCCCombine(SDValue Cmp, X86::CondCode &CC) {
24173 // Quit if not CMP and SUB with its value result used.
24174 if (Cmp.getOpcode() != X86ISD::CMP &&
24175 (Cmp.getOpcode() != X86ISD::SUB || Cmp.getNode()->hasAnyUseOfValue(0)))
24178 // Quit if not used as a boolean value.
24179 if (CC != X86::COND_E && CC != X86::COND_NE)
24182 // Check CMP operands. One of them should be 0 or 1 and the other should be
24183 // an SetCC or extended from it.
24184 SDValue Op1 = Cmp.getOperand(0);
24185 SDValue Op2 = Cmp.getOperand(1);
24188 const ConstantSDNode* C = nullptr;
24189 bool needOppositeCond = (CC == X86::COND_E);
24190 bool checkAgainstTrue = false; // Is it a comparison against 1?
24192 if ((C = dyn_cast<ConstantSDNode>(Op1)))
24194 else if ((C = dyn_cast<ConstantSDNode>(Op2)))
24196 else // Quit if all operands are not constants.
24199 if (C->getZExtValue() == 1) {
24200 needOppositeCond = !needOppositeCond;
24201 checkAgainstTrue = true;
24202 } else if (C->getZExtValue() != 0)
24203 // Quit if the constant is neither 0 or 1.
24206 bool truncatedToBoolWithAnd = false;
24207 // Skip (zext $x), (trunc $x), or (and $x, 1) node.
24208 while (SetCC.getOpcode() == ISD::ZERO_EXTEND ||
24209 SetCC.getOpcode() == ISD::TRUNCATE ||
24210 SetCC.getOpcode() == ISD::AND) {
24211 if (SetCC.getOpcode() == ISD::AND) {
24213 if (isOneConstant(SetCC.getOperand(0)))
24215 if (isOneConstant(SetCC.getOperand(1)))
24219 SetCC = SetCC.getOperand(OpIdx);
24220 truncatedToBoolWithAnd = true;
24222 SetCC = SetCC.getOperand(0);
24225 switch (SetCC.getOpcode()) {
24226 case X86ISD::SETCC_CARRY:
24227 // Since SETCC_CARRY gives output based on R = CF ? ~0 : 0, it's unsafe to
24228 // simplify it if the result of SETCC_CARRY is not canonicalized to 0 or 1,
24229 // i.e. it's a comparison against true but the result of SETCC_CARRY is not
24230 // truncated to i1 using 'and'.
24231 if (checkAgainstTrue && !truncatedToBoolWithAnd)
24233 assert(X86::CondCode(SetCC.getConstantOperandVal(0)) == X86::COND_B &&
24234 "Invalid use of SETCC_CARRY!");
24236 case X86ISD::SETCC:
24237 // Set the condition code or opposite one if necessary.
24238 CC = X86::CondCode(SetCC.getConstantOperandVal(0));
24239 if (needOppositeCond)
24240 CC = X86::GetOppositeBranchCondition(CC);
24241 return SetCC.getOperand(1);
24242 case X86ISD::CMOV: {
24243 // Check whether false/true value has canonical one, i.e. 0 or 1.
24244 ConstantSDNode *FVal = dyn_cast<ConstantSDNode>(SetCC.getOperand(0));
24245 ConstantSDNode *TVal = dyn_cast<ConstantSDNode>(SetCC.getOperand(1));
24246 // Quit if true value is not a constant.
24249 // Quit if false value is not a constant.
24251 SDValue Op = SetCC.getOperand(0);
24252 // Skip 'zext' or 'trunc' node.
24253 if (Op.getOpcode() == ISD::ZERO_EXTEND ||
24254 Op.getOpcode() == ISD::TRUNCATE)
24255 Op = Op.getOperand(0);
24256 // A special case for rdrand/rdseed, where 0 is set if false cond is
24258 if ((Op.getOpcode() != X86ISD::RDRAND &&
24259 Op.getOpcode() != X86ISD::RDSEED) || Op.getResNo() != 0)
24262 // Quit if false value is not the constant 0 or 1.
24263 bool FValIsFalse = true;
24264 if (FVal && FVal->getZExtValue() != 0) {
24265 if (FVal->getZExtValue() != 1)
24267 // If FVal is 1, opposite cond is needed.
24268 needOppositeCond = !needOppositeCond;
24269 FValIsFalse = false;
24271 // Quit if TVal is not the constant opposite of FVal.
24272 if (FValIsFalse && TVal->getZExtValue() != 1)
24274 if (!FValIsFalse && TVal->getZExtValue() != 0)
24276 CC = X86::CondCode(SetCC.getConstantOperandVal(2));
24277 if (needOppositeCond)
24278 CC = X86::GetOppositeBranchCondition(CC);
24279 return SetCC.getOperand(3);
24286 /// Check whether Cond is an AND/OR of SETCCs off of the same EFLAGS.
24288 /// (X86or (X86setcc) (X86setcc))
24289 /// (X86cmp (and (X86setcc) (X86setcc)), 0)
24290 static bool checkBoolTestAndOrSetCCCombine(SDValue Cond, X86::CondCode &CC0,
24291 X86::CondCode &CC1, SDValue &Flags,
24293 if (Cond->getOpcode() == X86ISD::CMP) {
24294 if (!isNullConstant(Cond->getOperand(1)))
24297 Cond = Cond->getOperand(0);
24302 SDValue SetCC0, SetCC1;
24303 switch (Cond->getOpcode()) {
24304 default: return false;
24311 SetCC0 = Cond->getOperand(0);
24312 SetCC1 = Cond->getOperand(1);
24316 // Make sure we have SETCC nodes, using the same flags value.
24317 if (SetCC0.getOpcode() != X86ISD::SETCC ||
24318 SetCC1.getOpcode() != X86ISD::SETCC ||
24319 SetCC0->getOperand(1) != SetCC1->getOperand(1))
24322 CC0 = (X86::CondCode)SetCC0->getConstantOperandVal(0);
24323 CC1 = (X86::CondCode)SetCC1->getConstantOperandVal(0);
24324 Flags = SetCC0->getOperand(1);
24328 /// Optimize X86ISD::CMOV [LHS, RHS, CONDCODE (e.g. X86::COND_NE), CONDVAL]
24329 static SDValue PerformCMOVCombine(SDNode *N, SelectionDAG &DAG,
24330 TargetLowering::DAGCombinerInfo &DCI,
24331 const X86Subtarget *Subtarget) {
24334 // If the flag operand isn't dead, don't touch this CMOV.
24335 if (N->getNumValues() == 2 && !SDValue(N, 1).use_empty())
24338 SDValue FalseOp = N->getOperand(0);
24339 SDValue TrueOp = N->getOperand(1);
24340 X86::CondCode CC = (X86::CondCode)N->getConstantOperandVal(2);
24341 SDValue Cond = N->getOperand(3);
24343 if (CC == X86::COND_E || CC == X86::COND_NE) {
24344 switch (Cond.getOpcode()) {
24348 // If operand of BSR / BSF are proven never zero, then ZF cannot be set.
24349 if (DAG.isKnownNeverZero(Cond.getOperand(0)))
24350 return (CC == X86::COND_E) ? FalseOp : TrueOp;
24356 Flags = checkBoolTestSetCCCombine(Cond, CC);
24357 if (Flags.getNode() &&
24358 // Extra check as FCMOV only supports a subset of X86 cond.
24359 (FalseOp.getValueType() != MVT::f80 || hasFPCMov(CC))) {
24360 SDValue Ops[] = { FalseOp, TrueOp,
24361 DAG.getConstant(CC, DL, MVT::i8), Flags };
24362 return DAG.getNode(X86ISD::CMOV, DL, N->getVTList(), Ops);
24365 // If this is a select between two integer constants, try to do some
24366 // optimizations. Note that the operands are ordered the opposite of SELECT
24368 if (ConstantSDNode *TrueC = dyn_cast<ConstantSDNode>(TrueOp)) {
24369 if (ConstantSDNode *FalseC = dyn_cast<ConstantSDNode>(FalseOp)) {
24370 // Canonicalize the TrueC/FalseC values so that TrueC (the true value) is
24371 // larger than FalseC (the false value).
24372 if (TrueC->getAPIntValue().ult(FalseC->getAPIntValue())) {
24373 CC = X86::GetOppositeBranchCondition(CC);
24374 std::swap(TrueC, FalseC);
24375 std::swap(TrueOp, FalseOp);
24378 // Optimize C ? 8 : 0 -> zext(setcc(C)) << 3. Likewise for any pow2/0.
24379 // This is efficient for any integer data type (including i8/i16) and
24381 if (FalseC->getAPIntValue() == 0 && TrueC->getAPIntValue().isPowerOf2()) {
24382 Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
24383 DAG.getConstant(CC, DL, MVT::i8), Cond);
24385 // Zero extend the condition if needed.
24386 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, TrueC->getValueType(0), Cond);
24388 unsigned ShAmt = TrueC->getAPIntValue().logBase2();
24389 Cond = DAG.getNode(ISD::SHL, DL, Cond.getValueType(), Cond,
24390 DAG.getConstant(ShAmt, DL, MVT::i8));
24391 if (N->getNumValues() == 2) // Dead flag value?
24392 return DCI.CombineTo(N, Cond, SDValue());
24396 // Optimize Cond ? cst+1 : cst -> zext(setcc(C)+cst. This is efficient
24397 // for any integer data type, including i8/i16.
24398 if (FalseC->getAPIntValue()+1 == TrueC->getAPIntValue()) {
24399 Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
24400 DAG.getConstant(CC, DL, MVT::i8), Cond);
24402 // Zero extend the condition if needed.
24403 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL,
24404 FalseC->getValueType(0), Cond);
24405 Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
24406 SDValue(FalseC, 0));
24408 if (N->getNumValues() == 2) // Dead flag value?
24409 return DCI.CombineTo(N, Cond, SDValue());
24413 // Optimize cases that will turn into an LEA instruction. This requires
24414 // an i32 or i64 and an efficient multiplier (1, 2, 3, 4, 5, 8, 9).
24415 if (N->getValueType(0) == MVT::i32 || N->getValueType(0) == MVT::i64) {
24416 uint64_t Diff = TrueC->getZExtValue()-FalseC->getZExtValue();
24417 if (N->getValueType(0) == MVT::i32) Diff = (unsigned)Diff;
24419 bool isFastMultiplier = false;
24421 switch ((unsigned char)Diff) {
24423 case 1: // result = add base, cond
24424 case 2: // result = lea base( , cond*2)
24425 case 3: // result = lea base(cond, cond*2)
24426 case 4: // result = lea base( , cond*4)
24427 case 5: // result = lea base(cond, cond*4)
24428 case 8: // result = lea base( , cond*8)
24429 case 9: // result = lea base(cond, cond*8)
24430 isFastMultiplier = true;
24435 if (isFastMultiplier) {
24436 APInt Diff = TrueC->getAPIntValue()-FalseC->getAPIntValue();
24437 Cond = DAG.getNode(X86ISD::SETCC, DL, MVT::i8,
24438 DAG.getConstant(CC, DL, MVT::i8), Cond);
24439 // Zero extend the condition if needed.
24440 Cond = DAG.getNode(ISD::ZERO_EXTEND, DL, FalseC->getValueType(0),
24442 // Scale the condition by the difference.
24444 Cond = DAG.getNode(ISD::MUL, DL, Cond.getValueType(), Cond,
24445 DAG.getConstant(Diff, DL, Cond.getValueType()));
24447 // Add the base if non-zero.
24448 if (FalseC->getAPIntValue() != 0)
24449 Cond = DAG.getNode(ISD::ADD, DL, Cond.getValueType(), Cond,
24450 SDValue(FalseC, 0));
24451 if (N->getNumValues() == 2) // Dead flag value?
24452 return DCI.CombineTo(N, Cond, SDValue());
24459 // Handle these cases:
24460 // (select (x != c), e, c) -> select (x != c), e, x),
24461 // (select (x == c), c, e) -> select (x == c), x, e)
24462 // where the c is an integer constant, and the "select" is the combination
24463 // of CMOV and CMP.
24465 // The rationale for this change is that the conditional-move from a constant
24466 // needs two instructions, however, conditional-move from a register needs
24467 // only one instruction.
24469 // CAVEAT: By replacing a constant with a symbolic value, it may obscure
24470 // some instruction-combining opportunities. This opt needs to be
24471 // postponed as late as possible.
24473 if (!DCI.isBeforeLegalize() && !DCI.isBeforeLegalizeOps()) {
24474 // the DCI.xxxx conditions are provided to postpone the optimization as
24475 // late as possible.
24477 ConstantSDNode *CmpAgainst = nullptr;
24478 if ((Cond.getOpcode() == X86ISD::CMP || Cond.getOpcode() == X86ISD::SUB) &&
24479 (CmpAgainst = dyn_cast<ConstantSDNode>(Cond.getOperand(1))) &&
24480 !isa<ConstantSDNode>(Cond.getOperand(0))) {
24482 if (CC == X86::COND_NE &&
24483 CmpAgainst == dyn_cast<ConstantSDNode>(FalseOp)) {
24484 CC = X86::GetOppositeBranchCondition(CC);
24485 std::swap(TrueOp, FalseOp);
24488 if (CC == X86::COND_E &&
24489 CmpAgainst == dyn_cast<ConstantSDNode>(TrueOp)) {
24490 SDValue Ops[] = { FalseOp, Cond.getOperand(0),
24491 DAG.getConstant(CC, DL, MVT::i8), Cond };
24492 return DAG.getNode(X86ISD::CMOV, DL, N->getVTList (), Ops);
24497 // Fold and/or of setcc's to double CMOV:
24498 // (CMOV F, T, ((cc1 | cc2) != 0)) -> (CMOV (CMOV F, T, cc1), T, cc2)
24499 // (CMOV F, T, ((cc1 & cc2) != 0)) -> (CMOV (CMOV T, F, !cc1), F, !cc2)
24501 // This combine lets us generate:
24502 // cmovcc1 (jcc1 if we don't have CMOV)
24508 // cmovne (jne if we don't have CMOV)
24509 // When we can't use the CMOV instruction, it might increase branch
24511 // When we can use CMOV, or when there is no mispredict, this improves
24512 // throughput and reduces register pressure.
24514 if (CC == X86::COND_NE) {
24516 X86::CondCode CC0, CC1;
24518 if (checkBoolTestAndOrSetCCCombine(Cond, CC0, CC1, Flags, isAndSetCC)) {
24520 std::swap(FalseOp, TrueOp);
24521 CC0 = X86::GetOppositeBranchCondition(CC0);
24522 CC1 = X86::GetOppositeBranchCondition(CC1);
24525 SDValue LOps[] = {FalseOp, TrueOp, DAG.getConstant(CC0, DL, MVT::i8),
24527 SDValue LCMOV = DAG.getNode(X86ISD::CMOV, DL, N->getVTList(), LOps);
24528 SDValue Ops[] = {LCMOV, TrueOp, DAG.getConstant(CC1, DL, MVT::i8), Flags};
24529 SDValue CMOV = DAG.getNode(X86ISD::CMOV, DL, N->getVTList(), Ops);
24530 DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1), SDValue(CMOV.getNode(), 1));
24538 /// PerformMulCombine - Optimize a single multiply with constant into two
24539 /// in order to implement it with two cheaper instructions, e.g.
24540 /// LEA + SHL, LEA + LEA.
24541 static SDValue PerformMulCombine(SDNode *N, SelectionDAG &DAG,
24542 TargetLowering::DAGCombinerInfo &DCI) {
24543 // An imul is usually smaller than the alternative sequence.
24544 if (DAG.getMachineFunction().getFunction()->optForMinSize())
24547 if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer())
24550 EVT VT = N->getValueType(0);
24551 if (VT != MVT::i64 && VT != MVT::i32)
24554 ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1));
24557 uint64_t MulAmt = C->getZExtValue();
24558 if (isPowerOf2_64(MulAmt) || MulAmt == 3 || MulAmt == 5 || MulAmt == 9)
24561 uint64_t MulAmt1 = 0;
24562 uint64_t MulAmt2 = 0;
24563 if ((MulAmt % 9) == 0) {
24565 MulAmt2 = MulAmt / 9;
24566 } else if ((MulAmt % 5) == 0) {
24568 MulAmt2 = MulAmt / 5;
24569 } else if ((MulAmt % 3) == 0) {
24571 MulAmt2 = MulAmt / 3;
24574 (isPowerOf2_64(MulAmt2) || MulAmt2 == 3 || MulAmt2 == 5 || MulAmt2 == 9)){
24577 if (isPowerOf2_64(MulAmt2) &&
24578 !(N->hasOneUse() && N->use_begin()->getOpcode() == ISD::ADD))
24579 // If second multiplifer is pow2, issue it first. We want the multiply by
24580 // 3, 5, or 9 to be folded into the addressing mode unless the lone use
24582 std::swap(MulAmt1, MulAmt2);
24585 if (isPowerOf2_64(MulAmt1))
24586 NewMul = DAG.getNode(ISD::SHL, DL, VT, N->getOperand(0),
24587 DAG.getConstant(Log2_64(MulAmt1), DL, MVT::i8));
24589 NewMul = DAG.getNode(X86ISD::MUL_IMM, DL, VT, N->getOperand(0),
24590 DAG.getConstant(MulAmt1, DL, VT));
24592 if (isPowerOf2_64(MulAmt2))
24593 NewMul = DAG.getNode(ISD::SHL, DL, VT, NewMul,
24594 DAG.getConstant(Log2_64(MulAmt2), DL, MVT::i8));
24596 NewMul = DAG.getNode(X86ISD::MUL_IMM, DL, VT, NewMul,
24597 DAG.getConstant(MulAmt2, DL, VT));
24599 // Do not add new nodes to DAG combiner worklist.
24600 DCI.CombineTo(N, NewMul, false);
24605 static SDValue PerformSHLCombine(SDNode *N, SelectionDAG &DAG) {
24606 SDValue N0 = N->getOperand(0);
24607 SDValue N1 = N->getOperand(1);
24608 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
24609 EVT VT = N0.getValueType();
24611 // fold (shl (and (setcc_c), c1), c2) -> (and setcc_c, (c1 << c2))
24612 // since the result of setcc_c is all zero's or all ones.
24613 if (VT.isInteger() && !VT.isVector() &&
24614 N1C && N0.getOpcode() == ISD::AND &&
24615 N0.getOperand(1).getOpcode() == ISD::Constant) {
24616 SDValue N00 = N0.getOperand(0);
24617 APInt Mask = cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
24618 APInt ShAmt = N1C->getAPIntValue();
24619 Mask = Mask.shl(ShAmt);
24620 bool MaskOK = false;
24621 // We can handle cases concerning bit-widening nodes containing setcc_c if
24622 // we carefully interrogate the mask to make sure we are semantics
24624 // The transform is not safe if the result of C1 << C2 exceeds the bitwidth
24625 // of the underlying setcc_c operation if the setcc_c was zero extended.
24626 // Consider the following example:
24627 // zext(setcc_c) -> i32 0x0000FFFF
24628 // c1 -> i32 0x0000FFFF
24629 // c2 -> i32 0x00000001
24630 // (shl (and (setcc_c), c1), c2) -> i32 0x0001FFFE
24631 // (and setcc_c, (c1 << c2)) -> i32 0x0000FFFE
24632 if (N00.getOpcode() == X86ISD::SETCC_CARRY) {
24634 } else if (N00.getOpcode() == ISD::SIGN_EXTEND &&
24635 N00.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY) {
24637 } else if ((N00.getOpcode() == ISD::ZERO_EXTEND ||
24638 N00.getOpcode() == ISD::ANY_EXTEND) &&
24639 N00.getOperand(0).getOpcode() == X86ISD::SETCC_CARRY) {
24640 MaskOK = Mask.isIntN(N00.getOperand(0).getValueSizeInBits());
24642 if (MaskOK && Mask != 0) {
24644 return DAG.getNode(ISD::AND, DL, VT, N00, DAG.getConstant(Mask, DL, VT));
24648 // Hardware support for vector shifts is sparse which makes us scalarize the
24649 // vector operations in many cases. Also, on sandybridge ADD is faster than
24651 // (shl V, 1) -> add V,V
24652 if (auto *N1BV = dyn_cast<BuildVectorSDNode>(N1))
24653 if (auto *N1SplatC = N1BV->getConstantSplatNode()) {
24654 assert(N0.getValueType().isVector() && "Invalid vector shift type");
24655 // We shift all of the values by one. In many cases we do not have
24656 // hardware support for this operation. This is better expressed as an ADD
24658 if (N1SplatC->getAPIntValue() == 1)
24659 return DAG.getNode(ISD::ADD, SDLoc(N), VT, N0, N0);
24665 /// \brief Returns a vector of 0s if the node in input is a vector logical
24666 /// shift by a constant amount which is known to be bigger than or equal
24667 /// to the vector element size in bits.
24668 static SDValue performShiftToAllZeros(SDNode *N, SelectionDAG &DAG,
24669 const X86Subtarget *Subtarget) {
24670 EVT VT = N->getValueType(0);
24672 if (VT != MVT::v2i64 && VT != MVT::v4i32 && VT != MVT::v8i16 &&
24673 (!Subtarget->hasInt256() ||
24674 (VT != MVT::v4i64 && VT != MVT::v8i32 && VT != MVT::v16i16)))
24677 SDValue Amt = N->getOperand(1);
24679 if (auto *AmtBV = dyn_cast<BuildVectorSDNode>(Amt))
24680 if (auto *AmtSplat = AmtBV->getConstantSplatNode()) {
24681 APInt ShiftAmt = AmtSplat->getAPIntValue();
24682 unsigned MaxAmount =
24683 VT.getSimpleVT().getVectorElementType().getSizeInBits();
24685 // SSE2/AVX2 logical shifts always return a vector of 0s
24686 // if the shift amount is bigger than or equal to
24687 // the element size. The constant shift amount will be
24688 // encoded as a 8-bit immediate.
24689 if (ShiftAmt.trunc(8).uge(MaxAmount))
24690 return getZeroVector(VT.getSimpleVT(), Subtarget, DAG, DL);
24696 /// PerformShiftCombine - Combine shifts.
24697 static SDValue PerformShiftCombine(SDNode* N, SelectionDAG &DAG,
24698 TargetLowering::DAGCombinerInfo &DCI,
24699 const X86Subtarget *Subtarget) {
24700 if (N->getOpcode() == ISD::SHL)
24701 if (SDValue V = PerformSHLCombine(N, DAG))
24704 // Try to fold this logical shift into a zero vector.
24705 if (N->getOpcode() != ISD::SRA)
24706 if (SDValue V = performShiftToAllZeros(N, DAG, Subtarget))
24712 // CMPEQCombine - Recognize the distinctive (AND (setcc ...) (setcc ..))
24713 // where both setccs reference the same FP CMP, and rewrite for CMPEQSS
24714 // and friends. Likewise for OR -> CMPNEQSS.
24715 static SDValue CMPEQCombine(SDNode *N, SelectionDAG &DAG,
24716 TargetLowering::DAGCombinerInfo &DCI,
24717 const X86Subtarget *Subtarget) {
24720 // SSE1 supports CMP{eq|ne}SS, and SSE2 added CMP{eq|ne}SD, but
24721 // we're requiring SSE2 for both.
24722 if (Subtarget->hasSSE2() && isAndOrOfSetCCs(SDValue(N, 0U), opcode)) {
24723 SDValue N0 = N->getOperand(0);
24724 SDValue N1 = N->getOperand(1);
24725 SDValue CMP0 = N0->getOperand(1);
24726 SDValue CMP1 = N1->getOperand(1);
24729 // The SETCCs should both refer to the same CMP.
24730 if (CMP0.getOpcode() != X86ISD::CMP || CMP0 != CMP1)
24733 SDValue CMP00 = CMP0->getOperand(0);
24734 SDValue CMP01 = CMP0->getOperand(1);
24735 EVT VT = CMP00.getValueType();
24737 if (VT == MVT::f32 || VT == MVT::f64) {
24738 bool ExpectingFlags = false;
24739 // Check for any users that want flags:
24740 for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
24741 !ExpectingFlags && UI != UE; ++UI)
24742 switch (UI->getOpcode()) {
24747 ExpectingFlags = true;
24749 case ISD::CopyToReg:
24750 case ISD::SIGN_EXTEND:
24751 case ISD::ZERO_EXTEND:
24752 case ISD::ANY_EXTEND:
24756 if (!ExpectingFlags) {
24757 enum X86::CondCode cc0 = (enum X86::CondCode)N0.getConstantOperandVal(0);
24758 enum X86::CondCode cc1 = (enum X86::CondCode)N1.getConstantOperandVal(0);
24760 if (cc1 == X86::COND_E || cc1 == X86::COND_NE) {
24761 X86::CondCode tmp = cc0;
24766 if ((cc0 == X86::COND_E && cc1 == X86::COND_NP) ||
24767 (cc0 == X86::COND_NE && cc1 == X86::COND_P)) {
24768 // FIXME: need symbolic constants for these magic numbers.
24769 // See X86ATTInstPrinter.cpp:printSSECC().
24770 unsigned x86cc = (cc0 == X86::COND_E) ? 0 : 4;
24771 if (Subtarget->hasAVX512()) {
24772 SDValue FSetCC = DAG.getNode(X86ISD::FSETCC, DL, MVT::i1, CMP00,
24774 DAG.getConstant(x86cc, DL, MVT::i8));
24775 if (N->getValueType(0) != MVT::i1)
24776 return DAG.getNode(ISD::ZERO_EXTEND, DL, N->getValueType(0),
24780 SDValue OnesOrZeroesF = DAG.getNode(X86ISD::FSETCC, DL,
24781 CMP00.getValueType(), CMP00, CMP01,
24782 DAG.getConstant(x86cc, DL,
24785 bool is64BitFP = (CMP00.getValueType() == MVT::f64);
24786 MVT IntVT = is64BitFP ? MVT::i64 : MVT::i32;
24788 if (is64BitFP && !Subtarget->is64Bit()) {
24789 // On a 32-bit target, we cannot bitcast the 64-bit float to a
24790 // 64-bit integer, since that's not a legal type. Since
24791 // OnesOrZeroesF is all ones of all zeroes, we don't need all the
24792 // bits, but can do this little dance to extract the lowest 32 bits
24793 // and work with those going forward.
24794 SDValue Vector64 = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, MVT::v2f64,
24796 SDValue Vector32 = DAG.getBitcast(MVT::v4f32, Vector64);
24797 OnesOrZeroesF = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, MVT::f32,
24798 Vector32, DAG.getIntPtrConstant(0, DL));
24802 SDValue OnesOrZeroesI = DAG.getBitcast(IntVT, OnesOrZeroesF);
24803 SDValue ANDed = DAG.getNode(ISD::AND, DL, IntVT, OnesOrZeroesI,
24804 DAG.getConstant(1, DL, IntVT));
24805 SDValue OneBitOfTruth = DAG.getNode(ISD::TRUNCATE, DL, MVT::i8,
24807 return OneBitOfTruth;
24815 /// CanFoldXORWithAllOnes - Test whether the XOR operand is a AllOnes vector
24816 /// so it can be folded inside ANDNP.
24817 static bool CanFoldXORWithAllOnes(const SDNode *N) {
24818 EVT VT = N->getValueType(0);
24820 // Match direct AllOnes for 128 and 256-bit vectors
24821 if (ISD::isBuildVectorAllOnes(N))
24824 // Look through a bit convert.
24825 if (N->getOpcode() == ISD::BITCAST)
24826 N = N->getOperand(0).getNode();
24828 // Sometimes the operand may come from a insert_subvector building a 256-bit
24830 if (VT.is256BitVector() &&
24831 N->getOpcode() == ISD::INSERT_SUBVECTOR) {
24832 SDValue V1 = N->getOperand(0);
24833 SDValue V2 = N->getOperand(1);
24835 if (V1.getOpcode() == ISD::INSERT_SUBVECTOR &&
24836 V1.getOperand(0).getOpcode() == ISD::UNDEF &&
24837 ISD::isBuildVectorAllOnes(V1.getOperand(1).getNode()) &&
24838 ISD::isBuildVectorAllOnes(V2.getNode()))
24845 // On AVX/AVX2 the type v8i1 is legalized to v8i16, which is an XMM sized
24846 // register. In most cases we actually compare or select YMM-sized registers
24847 // and mixing the two types creates horrible code. This method optimizes
24848 // some of the transition sequences.
24849 static SDValue WidenMaskArithmetic(SDNode *N, SelectionDAG &DAG,
24850 TargetLowering::DAGCombinerInfo &DCI,
24851 const X86Subtarget *Subtarget) {
24852 EVT VT = N->getValueType(0);
24853 if (!VT.is256BitVector())
24856 assert((N->getOpcode() == ISD::ANY_EXTEND ||
24857 N->getOpcode() == ISD::ZERO_EXTEND ||
24858 N->getOpcode() == ISD::SIGN_EXTEND) && "Invalid Node");
24860 SDValue Narrow = N->getOperand(0);
24861 EVT NarrowVT = Narrow->getValueType(0);
24862 if (!NarrowVT.is128BitVector())
24865 if (Narrow->getOpcode() != ISD::XOR &&
24866 Narrow->getOpcode() != ISD::AND &&
24867 Narrow->getOpcode() != ISD::OR)
24870 SDValue N0 = Narrow->getOperand(0);
24871 SDValue N1 = Narrow->getOperand(1);
24874 // The Left side has to be a trunc.
24875 if (N0.getOpcode() != ISD::TRUNCATE)
24878 // The type of the truncated inputs.
24879 EVT WideVT = N0->getOperand(0)->getValueType(0);
24883 // The right side has to be a 'trunc' or a constant vector.
24884 bool RHSTrunc = N1.getOpcode() == ISD::TRUNCATE;
24885 ConstantSDNode *RHSConstSplat = nullptr;
24886 if (auto *RHSBV = dyn_cast<BuildVectorSDNode>(N1))
24887 RHSConstSplat = RHSBV->getConstantSplatNode();
24888 if (!RHSTrunc && !RHSConstSplat)
24891 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
24893 if (!TLI.isOperationLegalOrPromote(Narrow->getOpcode(), WideVT))
24896 // Set N0 and N1 to hold the inputs to the new wide operation.
24897 N0 = N0->getOperand(0);
24898 if (RHSConstSplat) {
24899 N1 = DAG.getNode(ISD::ZERO_EXTEND, DL, WideVT.getVectorElementType(),
24900 SDValue(RHSConstSplat, 0));
24901 SmallVector<SDValue, 8> C(WideVT.getVectorNumElements(), N1);
24902 N1 = DAG.getNode(ISD::BUILD_VECTOR, DL, WideVT, C);
24903 } else if (RHSTrunc) {
24904 N1 = N1->getOperand(0);
24907 // Generate the wide operation.
24908 SDValue Op = DAG.getNode(Narrow->getOpcode(), DL, WideVT, N0, N1);
24909 unsigned Opcode = N->getOpcode();
24911 case ISD::ANY_EXTEND:
24913 case ISD::ZERO_EXTEND: {
24914 unsigned InBits = NarrowVT.getScalarSizeInBits();
24915 APInt Mask = APInt::getAllOnesValue(InBits);
24916 Mask = Mask.zext(VT.getScalarSizeInBits());
24917 return DAG.getNode(ISD::AND, DL, VT,
24918 Op, DAG.getConstant(Mask, DL, VT));
24920 case ISD::SIGN_EXTEND:
24921 return DAG.getNode(ISD::SIGN_EXTEND_INREG, DL, VT,
24922 Op, DAG.getValueType(NarrowVT));
24924 llvm_unreachable("Unexpected opcode");
24928 static SDValue VectorZextCombine(SDNode *N, SelectionDAG &DAG,
24929 TargetLowering::DAGCombinerInfo &DCI,
24930 const X86Subtarget *Subtarget) {
24931 SDValue N0 = N->getOperand(0);
24932 SDValue N1 = N->getOperand(1);
24935 // A vector zext_in_reg may be represented as a shuffle,
24936 // feeding into a bitcast (this represents anyext) feeding into
24937 // an and with a mask.
24938 // We'd like to try to combine that into a shuffle with zero
24939 // plus a bitcast, removing the and.
24940 if (N0.getOpcode() != ISD::BITCAST ||
24941 N0.getOperand(0).getOpcode() != ISD::VECTOR_SHUFFLE)
24944 // The other side of the AND should be a splat of 2^C, where C
24945 // is the number of bits in the source type.
24946 if (N1.getOpcode() == ISD::BITCAST)
24947 N1 = N1.getOperand(0);
24948 if (N1.getOpcode() != ISD::BUILD_VECTOR)
24950 BuildVectorSDNode *Vector = cast<BuildVectorSDNode>(N1);
24952 ShuffleVectorSDNode *Shuffle = cast<ShuffleVectorSDNode>(N0.getOperand(0));
24953 EVT SrcType = Shuffle->getValueType(0);
24955 // We expect a single-source shuffle
24956 if (Shuffle->getOperand(1)->getOpcode() != ISD::UNDEF)
24959 unsigned SrcSize = SrcType.getScalarSizeInBits();
24961 APInt SplatValue, SplatUndef;
24962 unsigned SplatBitSize;
24964 if (!Vector->isConstantSplat(SplatValue, SplatUndef,
24965 SplatBitSize, HasAnyUndefs))
24968 unsigned ResSize = N1.getValueType().getScalarSizeInBits();
24969 // Make sure the splat matches the mask we expect
24970 if (SplatBitSize > ResSize ||
24971 (SplatValue + 1).exactLogBase2() != (int)SrcSize)
24974 // Make sure the input and output size make sense
24975 if (SrcSize >= ResSize || ResSize % SrcSize)
24978 // We expect a shuffle of the form <0, u, u, u, 1, u, u, u...>
24979 // The number of u's between each two values depends on the ratio between
24980 // the source and dest type.
24981 unsigned ZextRatio = ResSize / SrcSize;
24982 bool IsZext = true;
24983 for (unsigned i = 0; i < SrcType.getVectorNumElements(); ++i) {
24984 if (i % ZextRatio) {
24985 if (Shuffle->getMaskElt(i) > 0) {
24991 if (Shuffle->getMaskElt(i) != (int)(i / ZextRatio)) {
24992 // Expected element number
25002 // Ok, perform the transformation - replace the shuffle with
25003 // a shuffle of the form <0, k, k, k, 1, k, k, k> with zero
25004 // (instead of undef) where the k elements come from the zero vector.
25005 SmallVector<int, 8> Mask;
25006 unsigned NumElems = SrcType.getVectorNumElements();
25007 for (unsigned i = 0; i < NumElems; ++i)
25009 Mask.push_back(NumElems);
25011 Mask.push_back(i / ZextRatio);
25013 SDValue NewShuffle = DAG.getVectorShuffle(Shuffle->getValueType(0), DL,
25014 Shuffle->getOperand(0), DAG.getConstant(0, DL, SrcType), Mask);
25015 return DAG.getBitcast(N0.getValueType(), NewShuffle);
25018 /// If both input operands of a logic op are being cast from floating point
25019 /// types, try to convert this into a floating point logic node to avoid
25020 /// unnecessary moves from SSE to integer registers.
25021 static SDValue convertIntLogicToFPLogic(SDNode *N, SelectionDAG &DAG,
25022 const X86Subtarget *Subtarget) {
25023 unsigned FPOpcode = ISD::DELETED_NODE;
25024 if (N->getOpcode() == ISD::AND)
25025 FPOpcode = X86ISD::FAND;
25026 else if (N->getOpcode() == ISD::OR)
25027 FPOpcode = X86ISD::FOR;
25028 else if (N->getOpcode() == ISD::XOR)
25029 FPOpcode = X86ISD::FXOR;
25031 assert(FPOpcode != ISD::DELETED_NODE &&
25032 "Unexpected input node for FP logic conversion");
25034 EVT VT = N->getValueType(0);
25035 SDValue N0 = N->getOperand(0);
25036 SDValue N1 = N->getOperand(1);
25038 if (N0.getOpcode() == ISD::BITCAST && N1.getOpcode() == ISD::BITCAST &&
25039 ((Subtarget->hasSSE1() && VT == MVT::i32) ||
25040 (Subtarget->hasSSE2() && VT == MVT::i64))) {
25041 SDValue N00 = N0.getOperand(0);
25042 SDValue N10 = N1.getOperand(0);
25043 EVT N00Type = N00.getValueType();
25044 EVT N10Type = N10.getValueType();
25045 if (N00Type.isFloatingPoint() && N10Type.isFloatingPoint()) {
25046 SDValue FPLogic = DAG.getNode(FPOpcode, DL, N00Type, N00, N10);
25047 return DAG.getBitcast(VT, FPLogic);
25053 static SDValue PerformAndCombine(SDNode *N, SelectionDAG &DAG,
25054 TargetLowering::DAGCombinerInfo &DCI,
25055 const X86Subtarget *Subtarget) {
25056 if (DCI.isBeforeLegalizeOps())
25059 if (SDValue Zext = VectorZextCombine(N, DAG, DCI, Subtarget))
25062 if (SDValue R = CMPEQCombine(N, DAG, DCI, Subtarget))
25065 if (SDValue FPLogic = convertIntLogicToFPLogic(N, DAG, Subtarget))
25068 EVT VT = N->getValueType(0);
25069 SDValue N0 = N->getOperand(0);
25070 SDValue N1 = N->getOperand(1);
25073 // Create BEXTR instructions
25074 // BEXTR is ((X >> imm) & (2**size-1))
25075 if (VT == MVT::i32 || VT == MVT::i64) {
25076 // Check for BEXTR.
25077 if ((Subtarget->hasBMI() || Subtarget->hasTBM()) &&
25078 (N0.getOpcode() == ISD::SRA || N0.getOpcode() == ISD::SRL)) {
25079 ConstantSDNode *MaskNode = dyn_cast<ConstantSDNode>(N1);
25080 ConstantSDNode *ShiftNode = dyn_cast<ConstantSDNode>(N0.getOperand(1));
25081 if (MaskNode && ShiftNode) {
25082 uint64_t Mask = MaskNode->getZExtValue();
25083 uint64_t Shift = ShiftNode->getZExtValue();
25084 if (isMask_64(Mask)) {
25085 uint64_t MaskSize = countPopulation(Mask);
25086 if (Shift + MaskSize <= VT.getSizeInBits())
25087 return DAG.getNode(X86ISD::BEXTR, DL, VT, N0.getOperand(0),
25088 DAG.getConstant(Shift | (MaskSize << 8), DL,
25097 // Want to form ANDNP nodes:
25098 // 1) In the hopes of then easily combining them with OR and AND nodes
25099 // to form PBLEND/PSIGN.
25100 // 2) To match ANDN packed intrinsics
25101 if (VT != MVT::v2i64 && VT != MVT::v4i64)
25104 // Check LHS for vnot
25105 if (N0.getOpcode() == ISD::XOR &&
25106 //ISD::isBuildVectorAllOnes(N0.getOperand(1).getNode()))
25107 CanFoldXORWithAllOnes(N0.getOperand(1).getNode()))
25108 return DAG.getNode(X86ISD::ANDNP, DL, VT, N0.getOperand(0), N1);
25110 // Check RHS for vnot
25111 if (N1.getOpcode() == ISD::XOR &&
25112 //ISD::isBuildVectorAllOnes(N1.getOperand(1).getNode()))
25113 CanFoldXORWithAllOnes(N1.getOperand(1).getNode()))
25114 return DAG.getNode(X86ISD::ANDNP, DL, VT, N1.getOperand(0), N0);
25119 static SDValue PerformOrCombine(SDNode *N, SelectionDAG &DAG,
25120 TargetLowering::DAGCombinerInfo &DCI,
25121 const X86Subtarget *Subtarget) {
25122 if (DCI.isBeforeLegalizeOps())
25125 if (SDValue R = CMPEQCombine(N, DAG, DCI, Subtarget))
25128 if (SDValue FPLogic = convertIntLogicToFPLogic(N, DAG, Subtarget))
25131 SDValue N0 = N->getOperand(0);
25132 SDValue N1 = N->getOperand(1);
25133 EVT VT = N->getValueType(0);
25135 // look for psign/blend
25136 if (VT == MVT::v2i64 || VT == MVT::v4i64) {
25137 if (!Subtarget->hasSSSE3() ||
25138 (VT == MVT::v4i64 && !Subtarget->hasInt256()))
25141 // Canonicalize pandn to RHS
25142 if (N0.getOpcode() == X86ISD::ANDNP)
25144 // or (and (m, y), (pandn m, x))
25145 if (N0.getOpcode() == ISD::AND && N1.getOpcode() == X86ISD::ANDNP) {
25146 SDValue Mask = N1.getOperand(0);
25147 SDValue X = N1.getOperand(1);
25149 if (N0.getOperand(0) == Mask)
25150 Y = N0.getOperand(1);
25151 if (N0.getOperand(1) == Mask)
25152 Y = N0.getOperand(0);
25154 // Check to see if the mask appeared in both the AND and ANDNP and
25158 // Validate that X, Y, and Mask are BIT_CONVERTS, and see through them.
25159 // Look through mask bitcast.
25160 if (Mask.getOpcode() == ISD::BITCAST)
25161 Mask = Mask.getOperand(0);
25162 if (X.getOpcode() == ISD::BITCAST)
25163 X = X.getOperand(0);
25164 if (Y.getOpcode() == ISD::BITCAST)
25165 Y = Y.getOperand(0);
25167 EVT MaskVT = Mask.getValueType();
25169 // Validate that the Mask operand is a vector sra node.
25170 // FIXME: what to do for bytes, since there is a psignb/pblendvb, but
25171 // there is no psrai.b
25172 unsigned EltBits = MaskVT.getVectorElementType().getSizeInBits();
25173 unsigned SraAmt = ~0;
25174 if (Mask.getOpcode() == ISD::SRA) {
25175 if (auto *AmtBV = dyn_cast<BuildVectorSDNode>(Mask.getOperand(1)))
25176 if (auto *AmtConst = AmtBV->getConstantSplatNode())
25177 SraAmt = AmtConst->getZExtValue();
25178 } else if (Mask.getOpcode() == X86ISD::VSRAI) {
25179 SDValue SraC = Mask.getOperand(1);
25180 SraAmt = cast<ConstantSDNode>(SraC)->getZExtValue();
25182 if ((SraAmt + 1) != EltBits)
25187 // Now we know we at least have a plendvb with the mask val. See if
25188 // we can form a psignb/w/d.
25189 // psign = x.type == y.type == mask.type && y = sub(0, x);
25190 if (Y.getOpcode() == ISD::SUB && Y.getOperand(1) == X &&
25191 ISD::isBuildVectorAllZeros(Y.getOperand(0).getNode()) &&
25192 X.getValueType() == MaskVT && Y.getValueType() == MaskVT) {
25193 assert((EltBits == 8 || EltBits == 16 || EltBits == 32) &&
25194 "Unsupported VT for PSIGN");
25195 Mask = DAG.getNode(X86ISD::PSIGN, DL, MaskVT, X, Mask.getOperand(0));
25196 return DAG.getBitcast(VT, Mask);
25198 // PBLENDVB only available on SSE 4.1
25199 if (!Subtarget->hasSSE41())
25202 MVT BlendVT = (VT == MVT::v4i64) ? MVT::v32i8 : MVT::v16i8;
25204 X = DAG.getBitcast(BlendVT, X);
25205 Y = DAG.getBitcast(BlendVT, Y);
25206 Mask = DAG.getBitcast(BlendVT, Mask);
25207 Mask = DAG.getNode(ISD::VSELECT, DL, BlendVT, Mask, Y, X);
25208 return DAG.getBitcast(VT, Mask);
25212 if (VT != MVT::i16 && VT != MVT::i32 && VT != MVT::i64)
25215 // fold (or (x << c) | (y >> (64 - c))) ==> (shld64 x, y, c)
25216 bool OptForSize = DAG.getMachineFunction().getFunction()->optForSize();
25218 // SHLD/SHRD instructions have lower register pressure, but on some
25219 // platforms they have higher latency than the equivalent
25220 // series of shifts/or that would otherwise be generated.
25221 // Don't fold (or (x << c) | (y >> (64 - c))) if SHLD/SHRD instructions
25222 // have higher latencies and we are not optimizing for size.
25223 if (!OptForSize && Subtarget->isSHLDSlow())
25226 if (N0.getOpcode() == ISD::SRL && N1.getOpcode() == ISD::SHL)
25228 if (N0.getOpcode() != ISD::SHL || N1.getOpcode() != ISD::SRL)
25230 if (!N0.hasOneUse() || !N1.hasOneUse())
25233 SDValue ShAmt0 = N0.getOperand(1);
25234 if (ShAmt0.getValueType() != MVT::i8)
25236 SDValue ShAmt1 = N1.getOperand(1);
25237 if (ShAmt1.getValueType() != MVT::i8)
25239 if (ShAmt0.getOpcode() == ISD::TRUNCATE)
25240 ShAmt0 = ShAmt0.getOperand(0);
25241 if (ShAmt1.getOpcode() == ISD::TRUNCATE)
25242 ShAmt1 = ShAmt1.getOperand(0);
25245 unsigned Opc = X86ISD::SHLD;
25246 SDValue Op0 = N0.getOperand(0);
25247 SDValue Op1 = N1.getOperand(0);
25248 if (ShAmt0.getOpcode() == ISD::SUB) {
25249 Opc = X86ISD::SHRD;
25250 std::swap(Op0, Op1);
25251 std::swap(ShAmt0, ShAmt1);
25254 unsigned Bits = VT.getSizeInBits();
25255 if (ShAmt1.getOpcode() == ISD::SUB) {
25256 SDValue Sum = ShAmt1.getOperand(0);
25257 if (ConstantSDNode *SumC = dyn_cast<ConstantSDNode>(Sum)) {
25258 SDValue ShAmt1Op1 = ShAmt1.getOperand(1);
25259 if (ShAmt1Op1.getNode()->getOpcode() == ISD::TRUNCATE)
25260 ShAmt1Op1 = ShAmt1Op1.getOperand(0);
25261 if (SumC->getSExtValue() == Bits && ShAmt1Op1 == ShAmt0)
25262 return DAG.getNode(Opc, DL, VT,
25264 DAG.getNode(ISD::TRUNCATE, DL,
25267 } else if (ConstantSDNode *ShAmt1C = dyn_cast<ConstantSDNode>(ShAmt1)) {
25268 ConstantSDNode *ShAmt0C = dyn_cast<ConstantSDNode>(ShAmt0);
25270 ShAmt0C->getSExtValue() + ShAmt1C->getSExtValue() == Bits)
25271 return DAG.getNode(Opc, DL, VT,
25272 N0.getOperand(0), N1.getOperand(0),
25273 DAG.getNode(ISD::TRUNCATE, DL,
25280 // Generate NEG and CMOV for integer abs.
25281 static SDValue performIntegerAbsCombine(SDNode *N, SelectionDAG &DAG) {
25282 EVT VT = N->getValueType(0);
25284 // Since X86 does not have CMOV for 8-bit integer, we don't convert
25285 // 8-bit integer abs to NEG and CMOV.
25286 if (VT.isInteger() && VT.getSizeInBits() == 8)
25289 SDValue N0 = N->getOperand(0);
25290 SDValue N1 = N->getOperand(1);
25293 // Check pattern of XOR(ADD(X,Y), Y) where Y is SRA(X, size(X)-1)
25294 // and change it to SUB and CMOV.
25295 if (VT.isInteger() && N->getOpcode() == ISD::XOR &&
25296 N0.getOpcode() == ISD::ADD &&
25297 N0.getOperand(1) == N1 &&
25298 N1.getOpcode() == ISD::SRA &&
25299 N1.getOperand(0) == N0.getOperand(0))
25300 if (ConstantSDNode *Y1C = dyn_cast<ConstantSDNode>(N1.getOperand(1)))
25301 if (Y1C->getAPIntValue() == VT.getSizeInBits()-1) {
25302 // Generate SUB & CMOV.
25303 SDValue Neg = DAG.getNode(X86ISD::SUB, DL, DAG.getVTList(VT, MVT::i32),
25304 DAG.getConstant(0, DL, VT), N0.getOperand(0));
25306 SDValue Ops[] = { N0.getOperand(0), Neg,
25307 DAG.getConstant(X86::COND_GE, DL, MVT::i8),
25308 SDValue(Neg.getNode(), 1) };
25309 return DAG.getNode(X86ISD::CMOV, DL, DAG.getVTList(VT, MVT::Glue), Ops);
25314 // Try to turn tests against the signbit in the form of:
25315 // XOR(TRUNCATE(SRL(X, size(X)-1)), 1)
25318 static SDValue foldXorTruncShiftIntoCmp(SDNode *N, SelectionDAG &DAG) {
25319 // This is only worth doing if the output type is i8.
25320 if (N->getValueType(0) != MVT::i8)
25323 SDValue N0 = N->getOperand(0);
25324 SDValue N1 = N->getOperand(1);
25326 // We should be performing an xor against a truncated shift.
25327 if (N0.getOpcode() != ISD::TRUNCATE || !N0.hasOneUse())
25330 // Make sure we are performing an xor against one.
25331 if (!isOneConstant(N1))
25334 // SetCC on x86 zero extends so only act on this if it's a logical shift.
25335 SDValue Shift = N0.getOperand(0);
25336 if (Shift.getOpcode() != ISD::SRL || !Shift.hasOneUse())
25339 // Make sure we are truncating from one of i16, i32 or i64.
25340 EVT ShiftTy = Shift.getValueType();
25341 if (ShiftTy != MVT::i16 && ShiftTy != MVT::i32 && ShiftTy != MVT::i64)
25344 // Make sure the shift amount extracts the sign bit.
25345 if (!isa<ConstantSDNode>(Shift.getOperand(1)) ||
25346 Shift.getConstantOperandVal(1) != ShiftTy.getSizeInBits() - 1)
25349 // Create a greater-than comparison against -1.
25350 // N.B. Using SETGE against 0 works but we want a canonical looking
25351 // comparison, using SETGT matches up with what TranslateX86CC.
25353 SDValue ShiftOp = Shift.getOperand(0);
25354 EVT ShiftOpTy = ShiftOp.getValueType();
25355 SDValue Cond = DAG.getSetCC(DL, MVT::i8, ShiftOp,
25356 DAG.getConstant(-1, DL, ShiftOpTy), ISD::SETGT);
25360 static SDValue PerformXorCombine(SDNode *N, SelectionDAG &DAG,
25361 TargetLowering::DAGCombinerInfo &DCI,
25362 const X86Subtarget *Subtarget) {
25363 if (DCI.isBeforeLegalizeOps())
25366 if (SDValue RV = foldXorTruncShiftIntoCmp(N, DAG))
25369 if (Subtarget->hasCMov())
25370 if (SDValue RV = performIntegerAbsCombine(N, DAG))
25373 if (SDValue FPLogic = convertIntLogicToFPLogic(N, DAG, Subtarget))
25379 /// This function detects the AVG pattern between vectors of unsigned i8/i16,
25380 /// which is c = (a + b + 1) / 2, and replace this operation with the efficient
25381 /// X86ISD::AVG instruction.
25382 static SDValue detectAVGPattern(SDValue In, EVT VT, SelectionDAG &DAG,
25383 const X86Subtarget *Subtarget, SDLoc DL) {
25384 if (!VT.isVector() || !VT.isSimple())
25386 EVT InVT = In.getValueType();
25387 unsigned NumElems = VT.getVectorNumElements();
25389 EVT ScalarVT = VT.getVectorElementType();
25390 if (!((ScalarVT == MVT::i8 || ScalarVT == MVT::i16) &&
25391 isPowerOf2_32(NumElems)))
25394 // InScalarVT is the intermediate type in AVG pattern and it should be greater
25395 // than the original input type (i8/i16).
25396 EVT InScalarVT = InVT.getVectorElementType();
25397 if (InScalarVT.getSizeInBits() <= ScalarVT.getSizeInBits())
25400 if (Subtarget->hasAVX512()) {
25401 if (VT.getSizeInBits() > 512)
25403 } else if (Subtarget->hasAVX2()) {
25404 if (VT.getSizeInBits() > 256)
25407 if (VT.getSizeInBits() > 128)
25411 // Detect the following pattern:
25413 // %1 = zext <N x i8> %a to <N x i32>
25414 // %2 = zext <N x i8> %b to <N x i32>
25415 // %3 = add nuw nsw <N x i32> %1, <i32 1 x N>
25416 // %4 = add nuw nsw <N x i32> %3, %2
25417 // %5 = lshr <N x i32> %N, <i32 1 x N>
25418 // %6 = trunc <N x i32> %5 to <N x i8>
25420 // In AVX512, the last instruction can also be a trunc store.
25422 if (In.getOpcode() != ISD::SRL)
25425 // A lambda checking the given SDValue is a constant vector and each element
25426 // is in the range [Min, Max].
25427 auto IsConstVectorInRange = [](SDValue V, unsigned Min, unsigned Max) {
25428 BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(V);
25429 if (!BV || !BV->isConstant())
25431 for (unsigned i = 0, e = V.getNumOperands(); i < e; i++) {
25432 ConstantSDNode *C = dyn_cast<ConstantSDNode>(V.getOperand(i));
25435 uint64_t Val = C->getZExtValue();
25436 if (Val < Min || Val > Max)
25442 // Check if each element of the vector is left-shifted by one.
25443 auto LHS = In.getOperand(0);
25444 auto RHS = In.getOperand(1);
25445 if (!IsConstVectorInRange(RHS, 1, 1))
25447 if (LHS.getOpcode() != ISD::ADD)
25450 // Detect a pattern of a + b + 1 where the order doesn't matter.
25451 SDValue Operands[3];
25452 Operands[0] = LHS.getOperand(0);
25453 Operands[1] = LHS.getOperand(1);
25455 // Take care of the case when one of the operands is a constant vector whose
25456 // element is in the range [1, 256].
25457 if (IsConstVectorInRange(Operands[1], 1, ScalarVT == MVT::i8 ? 256 : 65536) &&
25458 Operands[0].getOpcode() == ISD::ZERO_EXTEND &&
25459 Operands[0].getOperand(0).getValueType() == VT) {
25460 // The pattern is detected. Subtract one from the constant vector, then
25461 // demote it and emit X86ISD::AVG instruction.
25462 SDValue One = DAG.getConstant(1, DL, InScalarVT);
25463 SDValue Ones = DAG.getNode(ISD::BUILD_VECTOR, DL, InVT,
25464 SmallVector<SDValue, 8>(NumElems, One));
25465 Operands[1] = DAG.getNode(ISD::SUB, DL, InVT, Operands[1], Ones);
25466 Operands[1] = DAG.getNode(ISD::TRUNCATE, DL, VT, Operands[1]);
25467 return DAG.getNode(X86ISD::AVG, DL, VT, Operands[0].getOperand(0),
25471 if (Operands[0].getOpcode() == ISD::ADD)
25472 std::swap(Operands[0], Operands[1]);
25473 else if (Operands[1].getOpcode() != ISD::ADD)
25475 Operands[2] = Operands[1].getOperand(0);
25476 Operands[1] = Operands[1].getOperand(1);
25478 // Now we have three operands of two additions. Check that one of them is a
25479 // constant vector with ones, and the other two are promoted from i8/i16.
25480 for (int i = 0; i < 3; ++i) {
25481 if (!IsConstVectorInRange(Operands[i], 1, 1))
25483 std::swap(Operands[i], Operands[2]);
25485 // Check if Operands[0] and Operands[1] are results of type promotion.
25486 for (int j = 0; j < 2; ++j)
25487 if (Operands[j].getOpcode() != ISD::ZERO_EXTEND ||
25488 Operands[j].getOperand(0).getValueType() != VT)
25491 // The pattern is detected, emit X86ISD::AVG instruction.
25492 return DAG.getNode(X86ISD::AVG, DL, VT, Operands[0].getOperand(0),
25493 Operands[1].getOperand(0));
25499 static SDValue PerformTRUNCATECombine(SDNode *N, SelectionDAG &DAG,
25500 const X86Subtarget *Subtarget) {
25501 return detectAVGPattern(N->getOperand(0), N->getValueType(0), DAG, Subtarget,
25505 /// PerformLOADCombine - Do target-specific dag combines on LOAD nodes.
25506 static SDValue PerformLOADCombine(SDNode *N, SelectionDAG &DAG,
25507 TargetLowering::DAGCombinerInfo &DCI,
25508 const X86Subtarget *Subtarget) {
25509 LoadSDNode *Ld = cast<LoadSDNode>(N);
25510 EVT RegVT = Ld->getValueType(0);
25511 EVT MemVT = Ld->getMemoryVT();
25513 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
25515 // For chips with slow 32-byte unaligned loads, break the 32-byte operation
25516 // into two 16-byte operations.
25517 ISD::LoadExtType Ext = Ld->getExtensionType();
25519 unsigned AddressSpace = Ld->getAddressSpace();
25520 unsigned Alignment = Ld->getAlignment();
25521 if (RegVT.is256BitVector() && !DCI.isBeforeLegalizeOps() &&
25522 Ext == ISD::NON_EXTLOAD &&
25523 TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), RegVT,
25524 AddressSpace, Alignment, &Fast) && !Fast) {
25525 unsigned NumElems = RegVT.getVectorNumElements();
25529 SDValue Ptr = Ld->getBasePtr();
25530 SDValue Increment =
25531 DAG.getConstant(16, dl, TLI.getPointerTy(DAG.getDataLayout()));
25533 EVT HalfVT = EVT::getVectorVT(*DAG.getContext(), MemVT.getScalarType(),
25535 SDValue Load1 = DAG.getLoad(HalfVT, dl, Ld->getChain(), Ptr,
25536 Ld->getPointerInfo(), Ld->isVolatile(),
25537 Ld->isNonTemporal(), Ld->isInvariant(),
25539 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
25540 SDValue Load2 = DAG.getLoad(HalfVT, dl, Ld->getChain(), Ptr,
25541 Ld->getPointerInfo(), Ld->isVolatile(),
25542 Ld->isNonTemporal(), Ld->isInvariant(),
25543 std::min(16U, Alignment));
25544 SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
25546 Load2.getValue(1));
25548 SDValue NewVec = DAG.getUNDEF(RegVT);
25549 NewVec = Insert128BitVector(NewVec, Load1, 0, DAG, dl);
25550 NewVec = Insert128BitVector(NewVec, Load2, NumElems/2, DAG, dl);
25551 return DCI.CombineTo(N, NewVec, TF, true);
25557 /// PerformMLOADCombine - Resolve extending loads
25558 static SDValue PerformMLOADCombine(SDNode *N, SelectionDAG &DAG,
25559 TargetLowering::DAGCombinerInfo &DCI,
25560 const X86Subtarget *Subtarget) {
25561 MaskedLoadSDNode *Mld = cast<MaskedLoadSDNode>(N);
25562 if (Mld->getExtensionType() != ISD::SEXTLOAD)
25565 EVT VT = Mld->getValueType(0);
25566 unsigned NumElems = VT.getVectorNumElements();
25567 EVT LdVT = Mld->getMemoryVT();
25570 assert(LdVT != VT && "Cannot extend to the same type");
25571 unsigned ToSz = VT.getVectorElementType().getSizeInBits();
25572 unsigned FromSz = LdVT.getVectorElementType().getSizeInBits();
25573 // From, To sizes and ElemCount must be pow of two
25574 assert (isPowerOf2_32(NumElems * FromSz * ToSz) &&
25575 "Unexpected size for extending masked load");
25577 unsigned SizeRatio = ToSz / FromSz;
25578 assert(SizeRatio * NumElems * FromSz == VT.getSizeInBits());
25580 // Create a type on which we perform the shuffle
25581 EVT WideVecVT = EVT::getVectorVT(*DAG.getContext(),
25582 LdVT.getScalarType(), NumElems*SizeRatio);
25583 assert(WideVecVT.getSizeInBits() == VT.getSizeInBits());
25585 // Convert Src0 value
25586 SDValue WideSrc0 = DAG.getBitcast(WideVecVT, Mld->getSrc0());
25587 if (Mld->getSrc0().getOpcode() != ISD::UNDEF) {
25588 SmallVector<int, 16> ShuffleVec(NumElems * SizeRatio, -1);
25589 for (unsigned i = 0; i != NumElems; ++i)
25590 ShuffleVec[i] = i * SizeRatio;
25592 // Can't shuffle using an illegal type.
25593 assert(DAG.getTargetLoweringInfo().isTypeLegal(WideVecVT) &&
25594 "WideVecVT should be legal");
25595 WideSrc0 = DAG.getVectorShuffle(WideVecVT, dl, WideSrc0,
25596 DAG.getUNDEF(WideVecVT), &ShuffleVec[0]);
25598 // Prepare the new mask
25600 SDValue Mask = Mld->getMask();
25601 if (Mask.getValueType() == VT) {
25602 // Mask and original value have the same type
25603 NewMask = DAG.getBitcast(WideVecVT, Mask);
25604 SmallVector<int, 16> ShuffleVec(NumElems * SizeRatio, -1);
25605 for (unsigned i = 0; i != NumElems; ++i)
25606 ShuffleVec[i] = i * SizeRatio;
25607 for (unsigned i = NumElems; i != NumElems * SizeRatio; ++i)
25608 ShuffleVec[i] = NumElems * SizeRatio;
25609 NewMask = DAG.getVectorShuffle(WideVecVT, dl, NewMask,
25610 DAG.getConstant(0, dl, WideVecVT),
25614 assert(Mask.getValueType().getVectorElementType() == MVT::i1);
25615 unsigned WidenNumElts = NumElems*SizeRatio;
25616 unsigned MaskNumElts = VT.getVectorNumElements();
25617 EVT NewMaskVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
25620 unsigned NumConcat = WidenNumElts / MaskNumElts;
25621 SmallVector<SDValue, 16> Ops(NumConcat);
25622 SDValue ZeroVal = DAG.getConstant(0, dl, Mask.getValueType());
25624 for (unsigned i = 1; i != NumConcat; ++i)
25627 NewMask = DAG.getNode(ISD::CONCAT_VECTORS, dl, NewMaskVT, Ops);
25630 SDValue WideLd = DAG.getMaskedLoad(WideVecVT, dl, Mld->getChain(),
25631 Mld->getBasePtr(), NewMask, WideSrc0,
25632 Mld->getMemoryVT(), Mld->getMemOperand(),
25634 SDValue NewVec = DAG.getNode(X86ISD::VSEXT, dl, VT, WideLd);
25635 return DCI.CombineTo(N, NewVec, WideLd.getValue(1), true);
25637 /// PerformMSTORECombine - Resolve truncating stores
25638 static SDValue PerformMSTORECombine(SDNode *N, SelectionDAG &DAG,
25639 const X86Subtarget *Subtarget) {
25640 MaskedStoreSDNode *Mst = cast<MaskedStoreSDNode>(N);
25641 if (!Mst->isTruncatingStore())
25644 EVT VT = Mst->getValue().getValueType();
25645 unsigned NumElems = VT.getVectorNumElements();
25646 EVT StVT = Mst->getMemoryVT();
25649 assert(StVT != VT && "Cannot truncate to the same type");
25650 unsigned FromSz = VT.getVectorElementType().getSizeInBits();
25651 unsigned ToSz = StVT.getVectorElementType().getSizeInBits();
25653 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
25655 // The truncating store is legal in some cases. For example
25656 // vpmovqb, vpmovqw, vpmovqd, vpmovdb, vpmovdw
25657 // are designated for truncate store.
25658 // In this case we don't need any further transformations.
25659 if (TLI.isTruncStoreLegal(VT, StVT))
25662 // From, To sizes and ElemCount must be pow of two
25663 assert (isPowerOf2_32(NumElems * FromSz * ToSz) &&
25664 "Unexpected size for truncating masked store");
25665 // We are going to use the original vector elt for storing.
25666 // Accumulated smaller vector elements must be a multiple of the store size.
25667 assert (((NumElems * FromSz) % ToSz) == 0 &&
25668 "Unexpected ratio for truncating masked store");
25670 unsigned SizeRatio = FromSz / ToSz;
25671 assert(SizeRatio * NumElems * ToSz == VT.getSizeInBits());
25673 // Create a type on which we perform the shuffle
25674 EVT WideVecVT = EVT::getVectorVT(*DAG.getContext(),
25675 StVT.getScalarType(), NumElems*SizeRatio);
25677 assert(WideVecVT.getSizeInBits() == VT.getSizeInBits());
25679 SDValue WideVec = DAG.getBitcast(WideVecVT, Mst->getValue());
25680 SmallVector<int, 16> ShuffleVec(NumElems * SizeRatio, -1);
25681 for (unsigned i = 0; i != NumElems; ++i)
25682 ShuffleVec[i] = i * SizeRatio;
25684 // Can't shuffle using an illegal type.
25685 assert(DAG.getTargetLoweringInfo().isTypeLegal(WideVecVT) &&
25686 "WideVecVT should be legal");
25688 SDValue TruncatedVal = DAG.getVectorShuffle(WideVecVT, dl, WideVec,
25689 DAG.getUNDEF(WideVecVT),
25693 SDValue Mask = Mst->getMask();
25694 if (Mask.getValueType() == VT) {
25695 // Mask and original value have the same type
25696 NewMask = DAG.getBitcast(WideVecVT, Mask);
25697 for (unsigned i = 0; i != NumElems; ++i)
25698 ShuffleVec[i] = i * SizeRatio;
25699 for (unsigned i = NumElems; i != NumElems*SizeRatio; ++i)
25700 ShuffleVec[i] = NumElems*SizeRatio;
25701 NewMask = DAG.getVectorShuffle(WideVecVT, dl, NewMask,
25702 DAG.getConstant(0, dl, WideVecVT),
25706 assert(Mask.getValueType().getVectorElementType() == MVT::i1);
25707 unsigned WidenNumElts = NumElems*SizeRatio;
25708 unsigned MaskNumElts = VT.getVectorNumElements();
25709 EVT NewMaskVT = EVT::getVectorVT(*DAG.getContext(), MVT::i1,
25712 unsigned NumConcat = WidenNumElts / MaskNumElts;
25713 SmallVector<SDValue, 16> Ops(NumConcat);
25714 SDValue ZeroVal = DAG.getConstant(0, dl, Mask.getValueType());
25716 for (unsigned i = 1; i != NumConcat; ++i)
25719 NewMask = DAG.getNode(ISD::CONCAT_VECTORS, dl, NewMaskVT, Ops);
25722 return DAG.getMaskedStore(Mst->getChain(), dl, TruncatedVal,
25723 Mst->getBasePtr(), NewMask, StVT,
25724 Mst->getMemOperand(), false);
25726 /// PerformSTORECombine - Do target-specific dag combines on STORE nodes.
25727 static SDValue PerformSTORECombine(SDNode *N, SelectionDAG &DAG,
25728 const X86Subtarget *Subtarget) {
25729 StoreSDNode *St = cast<StoreSDNode>(N);
25730 EVT VT = St->getValue().getValueType();
25731 EVT StVT = St->getMemoryVT();
25733 SDValue StoredVal = St->getOperand(1);
25734 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
25736 // If we are saving a concatenation of two XMM registers and 32-byte stores
25737 // are slow, such as on Sandy Bridge, perform two 16-byte stores.
25739 unsigned AddressSpace = St->getAddressSpace();
25740 unsigned Alignment = St->getAlignment();
25741 if (VT.is256BitVector() && StVT == VT &&
25742 TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), VT,
25743 AddressSpace, Alignment, &Fast) && !Fast) {
25744 unsigned NumElems = VT.getVectorNumElements();
25748 SDValue Value0 = Extract128BitVector(StoredVal, 0, DAG, dl);
25749 SDValue Value1 = Extract128BitVector(StoredVal, NumElems/2, DAG, dl);
25752 DAG.getConstant(16, dl, TLI.getPointerTy(DAG.getDataLayout()));
25753 SDValue Ptr0 = St->getBasePtr();
25754 SDValue Ptr1 = DAG.getNode(ISD::ADD, dl, Ptr0.getValueType(), Ptr0, Stride);
25756 SDValue Ch0 = DAG.getStore(St->getChain(), dl, Value0, Ptr0,
25757 St->getPointerInfo(), St->isVolatile(),
25758 St->isNonTemporal(), Alignment);
25759 SDValue Ch1 = DAG.getStore(St->getChain(), dl, Value1, Ptr1,
25760 St->getPointerInfo(), St->isVolatile(),
25761 St->isNonTemporal(),
25762 std::min(16U, Alignment));
25763 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Ch0, Ch1);
25766 // Optimize trunc store (of multiple scalars) to shuffle and store.
25767 // First, pack all of the elements in one place. Next, store to memory
25768 // in fewer chunks.
25769 if (St->isTruncatingStore() && VT.isVector()) {
25770 // Check if we can detect an AVG pattern from the truncation. If yes,
25771 // replace the trunc store by a normal store with the result of X86ISD::AVG
25774 detectAVGPattern(St->getValue(), St->getMemoryVT(), DAG, Subtarget, dl);
25776 return DAG.getStore(St->getChain(), dl, Avg, St->getBasePtr(),
25777 St->getPointerInfo(), St->isVolatile(),
25778 St->isNonTemporal(), St->getAlignment());
25780 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
25781 unsigned NumElems = VT.getVectorNumElements();
25782 assert(StVT != VT && "Cannot truncate to the same type");
25783 unsigned FromSz = VT.getVectorElementType().getSizeInBits();
25784 unsigned ToSz = StVT.getVectorElementType().getSizeInBits();
25786 // The truncating store is legal in some cases. For example
25787 // vpmovqb, vpmovqw, vpmovqd, vpmovdb, vpmovdw
25788 // are designated for truncate store.
25789 // In this case we don't need any further transformations.
25790 if (TLI.isTruncStoreLegal(VT, StVT))
25793 // From, To sizes and ElemCount must be pow of two
25794 if (!isPowerOf2_32(NumElems * FromSz * ToSz)) return SDValue();
25795 // We are going to use the original vector elt for storing.
25796 // Accumulated smaller vector elements must be a multiple of the store size.
25797 if (0 != (NumElems * FromSz) % ToSz) return SDValue();
25799 unsigned SizeRatio = FromSz / ToSz;
25801 assert(SizeRatio * NumElems * ToSz == VT.getSizeInBits());
25803 // Create a type on which we perform the shuffle
25804 EVT WideVecVT = EVT::getVectorVT(*DAG.getContext(),
25805 StVT.getScalarType(), NumElems*SizeRatio);
25807 assert(WideVecVT.getSizeInBits() == VT.getSizeInBits());
25809 SDValue WideVec = DAG.getBitcast(WideVecVT, St->getValue());
25810 SmallVector<int, 8> ShuffleVec(NumElems * SizeRatio, -1);
25811 for (unsigned i = 0; i != NumElems; ++i)
25812 ShuffleVec[i] = i * SizeRatio;
25814 // Can't shuffle using an illegal type.
25815 if (!TLI.isTypeLegal(WideVecVT))
25818 SDValue Shuff = DAG.getVectorShuffle(WideVecVT, dl, WideVec,
25819 DAG.getUNDEF(WideVecVT),
25821 // At this point all of the data is stored at the bottom of the
25822 // register. We now need to save it to mem.
25824 // Find the largest store unit
25825 MVT StoreType = MVT::i8;
25826 for (MVT Tp : MVT::integer_valuetypes()) {
25827 if (TLI.isTypeLegal(Tp) && Tp.getSizeInBits() <= NumElems * ToSz)
25831 // On 32bit systems, we can't save 64bit integers. Try bitcasting to F64.
25832 if (TLI.isTypeLegal(MVT::f64) && StoreType.getSizeInBits() < 64 &&
25833 (64 <= NumElems * ToSz))
25834 StoreType = MVT::f64;
25836 // Bitcast the original vector into a vector of store-size units
25837 EVT StoreVecVT = EVT::getVectorVT(*DAG.getContext(),
25838 StoreType, VT.getSizeInBits()/StoreType.getSizeInBits());
25839 assert(StoreVecVT.getSizeInBits() == VT.getSizeInBits());
25840 SDValue ShuffWide = DAG.getBitcast(StoreVecVT, Shuff);
25841 SmallVector<SDValue, 8> Chains;
25842 SDValue Increment = DAG.getConstant(StoreType.getSizeInBits() / 8, dl,
25843 TLI.getPointerTy(DAG.getDataLayout()));
25844 SDValue Ptr = St->getBasePtr();
25846 // Perform one or more big stores into memory.
25847 for (unsigned i=0, e=(ToSz*NumElems)/StoreType.getSizeInBits(); i!=e; ++i) {
25848 SDValue SubVec = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
25849 StoreType, ShuffWide,
25850 DAG.getIntPtrConstant(i, dl));
25851 SDValue Ch = DAG.getStore(St->getChain(), dl, SubVec, Ptr,
25852 St->getPointerInfo(), St->isVolatile(),
25853 St->isNonTemporal(), St->getAlignment());
25854 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
25855 Chains.push_back(Ch);
25858 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Chains);
25861 // Turn load->store of MMX types into GPR load/stores. This avoids clobbering
25862 // the FP state in cases where an emms may be missing.
25863 // A preferable solution to the general problem is to figure out the right
25864 // places to insert EMMS. This qualifies as a quick hack.
25866 // Similarly, turn load->store of i64 into double load/stores in 32-bit mode.
25867 if (VT.getSizeInBits() != 64)
25870 const Function *F = DAG.getMachineFunction().getFunction();
25871 bool NoImplicitFloatOps = F->hasFnAttribute(Attribute::NoImplicitFloat);
25873 !Subtarget->useSoftFloat() && !NoImplicitFloatOps && Subtarget->hasSSE2();
25874 if ((VT.isVector() ||
25875 (VT == MVT::i64 && F64IsLegal && !Subtarget->is64Bit())) &&
25876 isa<LoadSDNode>(St->getValue()) &&
25877 !cast<LoadSDNode>(St->getValue())->isVolatile() &&
25878 St->getChain().hasOneUse() && !St->isVolatile()) {
25879 SDNode* LdVal = St->getValue().getNode();
25880 LoadSDNode *Ld = nullptr;
25881 int TokenFactorIndex = -1;
25882 SmallVector<SDValue, 8> Ops;
25883 SDNode* ChainVal = St->getChain().getNode();
25884 // Must be a store of a load. We currently handle two cases: the load
25885 // is a direct child, and it's under an intervening TokenFactor. It is
25886 // possible to dig deeper under nested TokenFactors.
25887 if (ChainVal == LdVal)
25888 Ld = cast<LoadSDNode>(St->getChain());
25889 else if (St->getValue().hasOneUse() &&
25890 ChainVal->getOpcode() == ISD::TokenFactor) {
25891 for (unsigned i = 0, e = ChainVal->getNumOperands(); i != e; ++i) {
25892 if (ChainVal->getOperand(i).getNode() == LdVal) {
25893 TokenFactorIndex = i;
25894 Ld = cast<LoadSDNode>(St->getValue());
25896 Ops.push_back(ChainVal->getOperand(i));
25900 if (!Ld || !ISD::isNormalLoad(Ld))
25903 // If this is not the MMX case, i.e. we are just turning i64 load/store
25904 // into f64 load/store, avoid the transformation if there are multiple
25905 // uses of the loaded value.
25906 if (!VT.isVector() && !Ld->hasNUsesOfValue(1, 0))
25911 // If we are a 64-bit capable x86, lower to a single movq load/store pair.
25912 // Otherwise, if it's legal to use f64 SSE instructions, use f64 load/store
25914 if (Subtarget->is64Bit() || F64IsLegal) {
25915 MVT LdVT = Subtarget->is64Bit() ? MVT::i64 : MVT::f64;
25916 SDValue NewLd = DAG.getLoad(LdVT, LdDL, Ld->getChain(), Ld->getBasePtr(),
25917 Ld->getPointerInfo(), Ld->isVolatile(),
25918 Ld->isNonTemporal(), Ld->isInvariant(),
25919 Ld->getAlignment());
25920 SDValue NewChain = NewLd.getValue(1);
25921 if (TokenFactorIndex != -1) {
25922 Ops.push_back(NewChain);
25923 NewChain = DAG.getNode(ISD::TokenFactor, LdDL, MVT::Other, Ops);
25925 return DAG.getStore(NewChain, StDL, NewLd, St->getBasePtr(),
25926 St->getPointerInfo(),
25927 St->isVolatile(), St->isNonTemporal(),
25928 St->getAlignment());
25931 // Otherwise, lower to two pairs of 32-bit loads / stores.
25932 SDValue LoAddr = Ld->getBasePtr();
25933 SDValue HiAddr = DAG.getNode(ISD::ADD, LdDL, MVT::i32, LoAddr,
25934 DAG.getConstant(4, LdDL, MVT::i32));
25936 SDValue LoLd = DAG.getLoad(MVT::i32, LdDL, Ld->getChain(), LoAddr,
25937 Ld->getPointerInfo(),
25938 Ld->isVolatile(), Ld->isNonTemporal(),
25939 Ld->isInvariant(), Ld->getAlignment());
25940 SDValue HiLd = DAG.getLoad(MVT::i32, LdDL, Ld->getChain(), HiAddr,
25941 Ld->getPointerInfo().getWithOffset(4),
25942 Ld->isVolatile(), Ld->isNonTemporal(),
25944 MinAlign(Ld->getAlignment(), 4));
25946 SDValue NewChain = LoLd.getValue(1);
25947 if (TokenFactorIndex != -1) {
25948 Ops.push_back(LoLd);
25949 Ops.push_back(HiLd);
25950 NewChain = DAG.getNode(ISD::TokenFactor, LdDL, MVT::Other, Ops);
25953 LoAddr = St->getBasePtr();
25954 HiAddr = DAG.getNode(ISD::ADD, StDL, MVT::i32, LoAddr,
25955 DAG.getConstant(4, StDL, MVT::i32));
25957 SDValue LoSt = DAG.getStore(NewChain, StDL, LoLd, LoAddr,
25958 St->getPointerInfo(),
25959 St->isVolatile(), St->isNonTemporal(),
25960 St->getAlignment());
25961 SDValue HiSt = DAG.getStore(NewChain, StDL, HiLd, HiAddr,
25962 St->getPointerInfo().getWithOffset(4),
25964 St->isNonTemporal(),
25965 MinAlign(St->getAlignment(), 4));
25966 return DAG.getNode(ISD::TokenFactor, StDL, MVT::Other, LoSt, HiSt);
25969 // This is similar to the above case, but here we handle a scalar 64-bit
25970 // integer store that is extracted from a vector on a 32-bit target.
25971 // If we have SSE2, then we can treat it like a floating-point double
25972 // to get past legalization. The execution dependencies fixup pass will
25973 // choose the optimal machine instruction for the store if this really is
25974 // an integer or v2f32 rather than an f64.
25975 if (VT == MVT::i64 && F64IsLegal && !Subtarget->is64Bit() &&
25976 St->getOperand(1).getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
25977 SDValue OldExtract = St->getOperand(1);
25978 SDValue ExtOp0 = OldExtract.getOperand(0);
25979 unsigned VecSize = ExtOp0.getValueSizeInBits();
25980 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), MVT::f64, VecSize / 64);
25981 SDValue BitCast = DAG.getBitcast(VecVT, ExtOp0);
25982 SDValue NewExtract = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64,
25983 BitCast, OldExtract.getOperand(1));
25984 return DAG.getStore(St->getChain(), dl, NewExtract, St->getBasePtr(),
25985 St->getPointerInfo(), St->isVolatile(),
25986 St->isNonTemporal(), St->getAlignment());
25992 /// Return 'true' if this vector operation is "horizontal"
25993 /// and return the operands for the horizontal operation in LHS and RHS. A
25994 /// horizontal operation performs the binary operation on successive elements
25995 /// of its first operand, then on successive elements of its second operand,
25996 /// returning the resulting values in a vector. For example, if
25997 /// A = < float a0, float a1, float a2, float a3 >
25999 /// B = < float b0, float b1, float b2, float b3 >
26000 /// then the result of doing a horizontal operation on A and B is
26001 /// A horizontal-op B = < a0 op a1, a2 op a3, b0 op b1, b2 op b3 >.
26002 /// In short, LHS and RHS are inspected to see if LHS op RHS is of the form
26003 /// A horizontal-op B, for some already available A and B, and if so then LHS is
26004 /// set to A, RHS to B, and the routine returns 'true'.
26005 /// Note that the binary operation should have the property that if one of the
26006 /// operands is UNDEF then the result is UNDEF.
26007 static bool isHorizontalBinOp(SDValue &LHS, SDValue &RHS, bool IsCommutative) {
26008 // Look for the following pattern: if
26009 // A = < float a0, float a1, float a2, float a3 >
26010 // B = < float b0, float b1, float b2, float b3 >
26012 // LHS = VECTOR_SHUFFLE A, B, <0, 2, 4, 6>
26013 // RHS = VECTOR_SHUFFLE A, B, <1, 3, 5, 7>
26014 // then LHS op RHS = < a0 op a1, a2 op a3, b0 op b1, b2 op b3 >
26015 // which is A horizontal-op B.
26017 // At least one of the operands should be a vector shuffle.
26018 if (LHS.getOpcode() != ISD::VECTOR_SHUFFLE &&
26019 RHS.getOpcode() != ISD::VECTOR_SHUFFLE)
26022 MVT VT = LHS.getSimpleValueType();
26024 assert((VT.is128BitVector() || VT.is256BitVector()) &&
26025 "Unsupported vector type for horizontal add/sub");
26027 // Handle 128 and 256-bit vector lengths. AVX defines horizontal add/sub to
26028 // operate independently on 128-bit lanes.
26029 unsigned NumElts = VT.getVectorNumElements();
26030 unsigned NumLanes = VT.getSizeInBits()/128;
26031 unsigned NumLaneElts = NumElts / NumLanes;
26032 assert((NumLaneElts % 2 == 0) &&
26033 "Vector type should have an even number of elements in each lane");
26034 unsigned HalfLaneElts = NumLaneElts/2;
26036 // View LHS in the form
26037 // LHS = VECTOR_SHUFFLE A, B, LMask
26038 // If LHS is not a shuffle then pretend it is the shuffle
26039 // LHS = VECTOR_SHUFFLE LHS, undef, <0, 1, ..., N-1>
26040 // NOTE: in what follows a default initialized SDValue represents an UNDEF of
26043 SmallVector<int, 16> LMask(NumElts);
26044 if (LHS.getOpcode() == ISD::VECTOR_SHUFFLE) {
26045 if (LHS.getOperand(0).getOpcode() != ISD::UNDEF)
26046 A = LHS.getOperand(0);
26047 if (LHS.getOperand(1).getOpcode() != ISD::UNDEF)
26048 B = LHS.getOperand(1);
26049 ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(LHS.getNode())->getMask();
26050 std::copy(Mask.begin(), Mask.end(), LMask.begin());
26052 if (LHS.getOpcode() != ISD::UNDEF)
26054 for (unsigned i = 0; i != NumElts; ++i)
26058 // Likewise, view RHS in the form
26059 // RHS = VECTOR_SHUFFLE C, D, RMask
26061 SmallVector<int, 16> RMask(NumElts);
26062 if (RHS.getOpcode() == ISD::VECTOR_SHUFFLE) {
26063 if (RHS.getOperand(0).getOpcode() != ISD::UNDEF)
26064 C = RHS.getOperand(0);
26065 if (RHS.getOperand(1).getOpcode() != ISD::UNDEF)
26066 D = RHS.getOperand(1);
26067 ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(RHS.getNode())->getMask();
26068 std::copy(Mask.begin(), Mask.end(), RMask.begin());
26070 if (RHS.getOpcode() != ISD::UNDEF)
26072 for (unsigned i = 0; i != NumElts; ++i)
26076 // Check that the shuffles are both shuffling the same vectors.
26077 if (!(A == C && B == D) && !(A == D && B == C))
26080 // If everything is UNDEF then bail out: it would be better to fold to UNDEF.
26081 if (!A.getNode() && !B.getNode())
26084 // If A and B occur in reverse order in RHS, then "swap" them (which means
26085 // rewriting the mask).
26087 ShuffleVectorSDNode::commuteMask(RMask);
26089 // At this point LHS and RHS are equivalent to
26090 // LHS = VECTOR_SHUFFLE A, B, LMask
26091 // RHS = VECTOR_SHUFFLE A, B, RMask
26092 // Check that the masks correspond to performing a horizontal operation.
26093 for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
26094 for (unsigned i = 0; i != NumLaneElts; ++i) {
26095 int LIdx = LMask[i+l], RIdx = RMask[i+l];
26097 // Ignore any UNDEF components.
26098 if (LIdx < 0 || RIdx < 0 ||
26099 (!A.getNode() && (LIdx < (int)NumElts || RIdx < (int)NumElts)) ||
26100 (!B.getNode() && (LIdx >= (int)NumElts || RIdx >= (int)NumElts)))
26103 // Check that successive elements are being operated on. If not, this is
26104 // not a horizontal operation.
26105 unsigned Src = (i/HalfLaneElts); // each lane is split between srcs
26106 int Index = 2*(i%HalfLaneElts) + NumElts*Src + l;
26107 if (!(LIdx == Index && RIdx == Index + 1) &&
26108 !(IsCommutative && LIdx == Index + 1 && RIdx == Index))
26113 LHS = A.getNode() ? A : B; // If A is 'UNDEF', use B for it.
26114 RHS = B.getNode() ? B : A; // If B is 'UNDEF', use A for it.
26118 /// Do target-specific dag combines on floating point adds.
26119 static SDValue PerformFADDCombine(SDNode *N, SelectionDAG &DAG,
26120 const X86Subtarget *Subtarget) {
26121 EVT VT = N->getValueType(0);
26122 SDValue LHS = N->getOperand(0);
26123 SDValue RHS = N->getOperand(1);
26125 // Try to synthesize horizontal adds from adds of shuffles.
26126 if (((Subtarget->hasSSE3() && (VT == MVT::v4f32 || VT == MVT::v2f64)) ||
26127 (Subtarget->hasFp256() && (VT == MVT::v8f32 || VT == MVT::v4f64))) &&
26128 isHorizontalBinOp(LHS, RHS, true))
26129 return DAG.getNode(X86ISD::FHADD, SDLoc(N), VT, LHS, RHS);
26133 /// Do target-specific dag combines on floating point subs.
26134 static SDValue PerformFSUBCombine(SDNode *N, SelectionDAG &DAG,
26135 const X86Subtarget *Subtarget) {
26136 EVT VT = N->getValueType(0);
26137 SDValue LHS = N->getOperand(0);
26138 SDValue RHS = N->getOperand(1);
26140 // Try to synthesize horizontal subs from subs of shuffles.
26141 if (((Subtarget->hasSSE3() && (VT == MVT::v4f32 || VT == MVT::v2f64)) ||
26142 (Subtarget->hasFp256() && (VT == MVT::v8f32 || VT == MVT::v4f64))) &&
26143 isHorizontalBinOp(LHS, RHS, false))
26144 return DAG.getNode(X86ISD::FHSUB, SDLoc(N), VT, LHS, RHS);
26148 /// Do target-specific dag combines on floating point negations.
26149 static SDValue PerformFNEGCombine(SDNode *N, SelectionDAG &DAG,
26150 const X86Subtarget *Subtarget) {
26151 EVT VT = N->getValueType(0);
26152 EVT SVT = VT.getScalarType();
26153 SDValue Arg = N->getOperand(0);
26156 // Let legalize expand this if it isn't a legal type yet.
26157 if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
26160 // If we're negating a FMUL node on a target with FMA, then we can avoid the
26161 // use of a constant by performing (-0 - A*B) instead.
26162 // FIXME: Check rounding control flags as well once it becomes available.
26163 if (Arg.getOpcode() == ISD::FMUL && (SVT == MVT::f32 || SVT == MVT::f64) &&
26164 Arg->getFlags()->hasNoSignedZeros() && Subtarget->hasAnyFMA()) {
26165 SDValue Zero = DAG.getConstantFP(0.0, DL, VT);
26166 return DAG.getNode(X86ISD::FNMSUB, DL, VT, Arg.getOperand(0),
26167 Arg.getOperand(1), Zero);
26170 // If we're negating a FMA node, then we can adjust the
26171 // instruction to include the extra negation.
26172 if (Arg.hasOneUse()) {
26173 switch (Arg.getOpcode()) {
26174 case X86ISD::FMADD:
26175 return DAG.getNode(X86ISD::FNMSUB, DL, VT, Arg.getOperand(0),
26176 Arg.getOperand(1), Arg.getOperand(2));
26177 case X86ISD::FMSUB:
26178 return DAG.getNode(X86ISD::FNMADD, DL, VT, Arg.getOperand(0),
26179 Arg.getOperand(1), Arg.getOperand(2));
26180 case X86ISD::FNMADD:
26181 return DAG.getNode(X86ISD::FMSUB, DL, VT, Arg.getOperand(0),
26182 Arg.getOperand(1), Arg.getOperand(2));
26183 case X86ISD::FNMSUB:
26184 return DAG.getNode(X86ISD::FMADD, DL, VT, Arg.getOperand(0),
26185 Arg.getOperand(1), Arg.getOperand(2));
26191 /// Do target-specific dag combines on X86ISD::FOR and X86ISD::FXOR nodes.
26192 static SDValue PerformFORCombine(SDNode *N, SelectionDAG &DAG,
26193 const X86Subtarget *Subtarget) {
26194 assert(N->getOpcode() == X86ISD::FOR || N->getOpcode() == X86ISD::FXOR);
26196 // F[X]OR(0.0, x) -> x
26197 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
26198 if (C->getValueAPF().isPosZero())
26199 return N->getOperand(1);
26201 // F[X]OR(x, 0.0) -> x
26202 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
26203 if (C->getValueAPF().isPosZero())
26204 return N->getOperand(0);
26206 EVT VT = N->getValueType(0);
26207 if (VT.is512BitVector() && !Subtarget->hasDQI()) {
26209 MVT IntScalar = MVT::getIntegerVT(VT.getScalarSizeInBits());
26210 MVT IntVT = MVT::getVectorVT(IntScalar, VT.getVectorNumElements());
26212 SDValue Op0 = DAG.getNode(ISD::BITCAST, dl, IntVT, N->getOperand(0));
26213 SDValue Op1 = DAG.getNode(ISD::BITCAST, dl, IntVT, N->getOperand(1));
26214 unsigned IntOpcode = (N->getOpcode() == X86ISD::FOR) ? ISD::OR : ISD::XOR;
26215 SDValue IntOp = DAG.getNode(IntOpcode, dl, IntVT, Op0, Op1);
26216 return DAG.getNode(ISD::BITCAST, dl, VT, IntOp);
26221 /// Do target-specific dag combines on X86ISD::FMIN and X86ISD::FMAX nodes.
26222 static SDValue PerformFMinFMaxCombine(SDNode *N, SelectionDAG &DAG) {
26223 assert(N->getOpcode() == X86ISD::FMIN || N->getOpcode() == X86ISD::FMAX);
26225 // Only perform optimizations if UnsafeMath is used.
26226 if (!DAG.getTarget().Options.UnsafeFPMath)
26229 // If we run in unsafe-math mode, then convert the FMAX and FMIN nodes
26230 // into FMINC and FMAXC, which are Commutative operations.
26231 unsigned NewOp = 0;
26232 switch (N->getOpcode()) {
26233 default: llvm_unreachable("unknown opcode");
26234 case X86ISD::FMIN: NewOp = X86ISD::FMINC; break;
26235 case X86ISD::FMAX: NewOp = X86ISD::FMAXC; break;
26238 return DAG.getNode(NewOp, SDLoc(N), N->getValueType(0),
26239 N->getOperand(0), N->getOperand(1));
26242 /// Do target-specific dag combines on X86ISD::FAND nodes.
26243 static SDValue PerformFANDCombine(SDNode *N, SelectionDAG &DAG) {
26244 // FAND(0.0, x) -> 0.0
26245 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
26246 if (C->getValueAPF().isPosZero())
26247 return N->getOperand(0);
26249 // FAND(x, 0.0) -> 0.0
26250 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
26251 if (C->getValueAPF().isPosZero())
26252 return N->getOperand(1);
26257 /// Do target-specific dag combines on X86ISD::FANDN nodes
26258 static SDValue PerformFANDNCombine(SDNode *N, SelectionDAG &DAG) {
26259 // FANDN(0.0, x) -> x
26260 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0)))
26261 if (C->getValueAPF().isPosZero())
26262 return N->getOperand(1);
26264 // FANDN(x, 0.0) -> 0.0
26265 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(1)))
26266 if (C->getValueAPF().isPosZero())
26267 return N->getOperand(1);
26272 static SDValue PerformBTCombine(SDNode *N,
26274 TargetLowering::DAGCombinerInfo &DCI) {
26275 // BT ignores high bits in the bit index operand.
26276 SDValue Op1 = N->getOperand(1);
26277 if (Op1.hasOneUse()) {
26278 unsigned BitWidth = Op1.getValueSizeInBits();
26279 APInt DemandedMask = APInt::getLowBitsSet(BitWidth, Log2_32(BitWidth));
26280 APInt KnownZero, KnownOne;
26281 TargetLowering::TargetLoweringOpt TLO(DAG, !DCI.isBeforeLegalize(),
26282 !DCI.isBeforeLegalizeOps());
26283 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
26284 if (TLO.ShrinkDemandedConstant(Op1, DemandedMask) ||
26285 TLI.SimplifyDemandedBits(Op1, DemandedMask, KnownZero, KnownOne, TLO))
26286 DCI.CommitTargetLoweringOpt(TLO);
26291 static SDValue PerformVZEXT_MOVLCombine(SDNode *N, SelectionDAG &DAG) {
26292 SDValue Op = N->getOperand(0);
26293 if (Op.getOpcode() == ISD::BITCAST)
26294 Op = Op.getOperand(0);
26295 EVT VT = N->getValueType(0), OpVT = Op.getValueType();
26296 if (Op.getOpcode() == X86ISD::VZEXT_LOAD &&
26297 VT.getVectorElementType().getSizeInBits() ==
26298 OpVT.getVectorElementType().getSizeInBits()) {
26299 return DAG.getNode(ISD::BITCAST, SDLoc(N), VT, Op);
26304 static SDValue PerformSIGN_EXTEND_INREGCombine(SDNode *N, SelectionDAG &DAG,
26305 const X86Subtarget *Subtarget) {
26306 EVT VT = N->getValueType(0);
26307 if (!VT.isVector())
26310 SDValue N0 = N->getOperand(0);
26311 SDValue N1 = N->getOperand(1);
26312 EVT ExtraVT = cast<VTSDNode>(N1)->getVT();
26315 // The SIGN_EXTEND_INREG to v4i64 is expensive operation on the
26316 // both SSE and AVX2 since there is no sign-extended shift right
26317 // operation on a vector with 64-bit elements.
26318 //(sext_in_reg (v4i64 anyext (v4i32 x )), ExtraVT) ->
26319 // (v4i64 sext (v4i32 sext_in_reg (v4i32 x , ExtraVT)))
26320 if (VT == MVT::v4i64 && (N0.getOpcode() == ISD::ANY_EXTEND ||
26321 N0.getOpcode() == ISD::SIGN_EXTEND)) {
26322 SDValue N00 = N0.getOperand(0);
26324 // EXTLOAD has a better solution on AVX2,
26325 // it may be replaced with X86ISD::VSEXT node.
26326 if (N00.getOpcode() == ISD::LOAD && Subtarget->hasInt256())
26327 if (!ISD::isNormalLoad(N00.getNode()))
26330 if (N00.getValueType() == MVT::v4i32 && ExtraVT.getSizeInBits() < 128) {
26331 SDValue Tmp = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, MVT::v4i32,
26333 return DAG.getNode(ISD::SIGN_EXTEND, dl, MVT::v4i64, Tmp);
26339 /// sext(add_nsw(x, C)) --> add(sext(x), C_sext)
26340 /// Promoting a sign extension ahead of an 'add nsw' exposes opportunities
26341 /// to combine math ops, use an LEA, or use a complex addressing mode. This can
26342 /// eliminate extend, add, and shift instructions.
26343 static SDValue promoteSextBeforeAddNSW(SDNode *Sext, SelectionDAG &DAG,
26344 const X86Subtarget *Subtarget) {
26345 // TODO: This should be valid for other integer types.
26346 EVT VT = Sext->getValueType(0);
26347 if (VT != MVT::i64)
26350 // We need an 'add nsw' feeding into the 'sext'.
26351 SDValue Add = Sext->getOperand(0);
26352 if (Add.getOpcode() != ISD::ADD || !Add->getFlags()->hasNoSignedWrap())
26355 // Having a constant operand to the 'add' ensures that we are not increasing
26356 // the instruction count because the constant is extended for free below.
26357 // A constant operand can also become the displacement field of an LEA.
26358 auto *AddOp1 = dyn_cast<ConstantSDNode>(Add.getOperand(1));
26362 // Don't make the 'add' bigger if there's no hope of combining it with some
26363 // other 'add' or 'shl' instruction.
26364 // TODO: It may be profitable to generate simpler LEA instructions in place
26365 // of single 'add' instructions, but the cost model for selecting an LEA
26366 // currently has a high threshold.
26367 bool HasLEAPotential = false;
26368 for (auto *User : Sext->uses()) {
26369 if (User->getOpcode() == ISD::ADD || User->getOpcode() == ISD::SHL) {
26370 HasLEAPotential = true;
26374 if (!HasLEAPotential)
26377 // Everything looks good, so pull the 'sext' ahead of the 'add'.
26378 int64_t AddConstant = AddOp1->getSExtValue();
26379 SDValue AddOp0 = Add.getOperand(0);
26380 SDValue NewSext = DAG.getNode(ISD::SIGN_EXTEND, SDLoc(Sext), VT, AddOp0);
26381 SDValue NewConstant = DAG.getConstant(AddConstant, SDLoc(Add), VT);
26383 // The wider add is guaranteed to not wrap because both operands are
26386 Flags.setNoSignedWrap(true);
26387 return DAG.getNode(ISD::ADD, SDLoc(Add), VT, NewSext, NewConstant, &Flags);
26390 static SDValue PerformSExtCombine(SDNode *N, SelectionDAG &DAG,
26391 TargetLowering::DAGCombinerInfo &DCI,
26392 const X86Subtarget *Subtarget) {
26393 SDValue N0 = N->getOperand(0);
26394 EVT VT = N->getValueType(0);
26395 EVT SVT = VT.getScalarType();
26396 EVT InVT = N0.getValueType();
26397 EVT InSVT = InVT.getScalarType();
26400 // (i8,i32 sext (sdivrem (i8 x, i8 y)) ->
26401 // (i8,i32 (sdivrem_sext_hreg (i8 x, i8 y)
26402 // This exposes the sext to the sdivrem lowering, so that it directly extends
26403 // from AH (which we otherwise need to do contortions to access).
26404 if (N0.getOpcode() == ISD::SDIVREM && N0.getResNo() == 1 &&
26405 InVT == MVT::i8 && VT == MVT::i32) {
26406 SDVTList NodeTys = DAG.getVTList(MVT::i8, VT);
26407 SDValue R = DAG.getNode(X86ISD::SDIVREM8_SEXT_HREG, DL, NodeTys,
26408 N0.getOperand(0), N0.getOperand(1));
26409 DAG.ReplaceAllUsesOfValueWith(N0.getValue(0), R.getValue(0));
26410 return R.getValue(1);
26413 if (!DCI.isBeforeLegalizeOps()) {
26414 if (InVT == MVT::i1) {
26415 SDValue Zero = DAG.getConstant(0, DL, VT);
26417 DAG.getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), DL, VT);
26418 return DAG.getNode(ISD::SELECT, DL, VT, N0, AllOnes, Zero);
26423 if (VT.isVector() && Subtarget->hasSSE2()) {
26424 auto ExtendVecSize = [&DAG](SDLoc DL, SDValue N, unsigned Size) {
26425 EVT InVT = N.getValueType();
26426 EVT OutVT = EVT::getVectorVT(*DAG.getContext(), InVT.getScalarType(),
26427 Size / InVT.getScalarSizeInBits());
26428 SmallVector<SDValue, 8> Opnds(Size / InVT.getSizeInBits(),
26429 DAG.getUNDEF(InVT));
26431 return DAG.getNode(ISD::CONCAT_VECTORS, DL, OutVT, Opnds);
26434 // If target-size is less than 128-bits, extend to a type that would extend
26435 // to 128 bits, extend that and extract the original target vector.
26436 if (VT.getSizeInBits() < 128 && !(128 % VT.getSizeInBits()) &&
26437 (SVT == MVT::i64 || SVT == MVT::i32 || SVT == MVT::i16) &&
26438 (InSVT == MVT::i32 || InSVT == MVT::i16 || InSVT == MVT::i8)) {
26439 unsigned Scale = 128 / VT.getSizeInBits();
26441 EVT::getVectorVT(*DAG.getContext(), SVT, 128 / SVT.getSizeInBits());
26442 SDValue Ex = ExtendVecSize(DL, N0, Scale * InVT.getSizeInBits());
26443 SDValue SExt = DAG.getNode(ISD::SIGN_EXTEND, DL, ExVT, Ex);
26444 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, VT, SExt,
26445 DAG.getIntPtrConstant(0, DL));
26448 // If target-size is 128-bits, then convert to ISD::SIGN_EXTEND_VECTOR_INREG
26449 // which ensures lowering to X86ISD::VSEXT (pmovsx*).
26450 if (VT.getSizeInBits() == 128 &&
26451 (SVT == MVT::i64 || SVT == MVT::i32 || SVT == MVT::i16) &&
26452 (InSVT == MVT::i32 || InSVT == MVT::i16 || InSVT == MVT::i8)) {
26453 SDValue ExOp = ExtendVecSize(DL, N0, 128);
26454 return DAG.getSignExtendVectorInReg(ExOp, DL, VT);
26457 // On pre-AVX2 targets, split into 128-bit nodes of
26458 // ISD::SIGN_EXTEND_VECTOR_INREG.
26459 if (!Subtarget->hasInt256() && !(VT.getSizeInBits() % 128) &&
26460 (SVT == MVT::i64 || SVT == MVT::i32 || SVT == MVT::i16) &&
26461 (InSVT == MVT::i32 || InSVT == MVT::i16 || InSVT == MVT::i8)) {
26462 unsigned NumVecs = VT.getSizeInBits() / 128;
26463 unsigned NumSubElts = 128 / SVT.getSizeInBits();
26464 EVT SubVT = EVT::getVectorVT(*DAG.getContext(), SVT, NumSubElts);
26465 EVT InSubVT = EVT::getVectorVT(*DAG.getContext(), InSVT, NumSubElts);
26467 SmallVector<SDValue, 8> Opnds;
26468 for (unsigned i = 0, Offset = 0; i != NumVecs;
26469 ++i, Offset += NumSubElts) {
26470 SDValue SrcVec = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, InSubVT, N0,
26471 DAG.getIntPtrConstant(Offset, DL));
26472 SrcVec = ExtendVecSize(DL, SrcVec, 128);
26473 SrcVec = DAG.getSignExtendVectorInReg(SrcVec, DL, SubVT);
26474 Opnds.push_back(SrcVec);
26476 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, Opnds);
26480 if (Subtarget->hasAVX() && VT.is256BitVector())
26481 if (SDValue R = WidenMaskArithmetic(N, DAG, DCI, Subtarget))
26484 if (SDValue NewAdd = promoteSextBeforeAddNSW(N, DAG, Subtarget))
26490 static SDValue PerformFMACombine(SDNode *N, SelectionDAG &DAG,
26491 const X86Subtarget* Subtarget) {
26493 EVT VT = N->getValueType(0);
26495 // Let legalize expand this if it isn't a legal type yet.
26496 if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
26499 EVT ScalarVT = VT.getScalarType();
26500 if ((ScalarVT != MVT::f32 && ScalarVT != MVT::f64) || !Subtarget->hasAnyFMA())
26503 SDValue A = N->getOperand(0);
26504 SDValue B = N->getOperand(1);
26505 SDValue C = N->getOperand(2);
26507 bool NegA = (A.getOpcode() == ISD::FNEG);
26508 bool NegB = (B.getOpcode() == ISD::FNEG);
26509 bool NegC = (C.getOpcode() == ISD::FNEG);
26511 // Negative multiplication when NegA xor NegB
26512 bool NegMul = (NegA != NegB);
26514 A = A.getOperand(0);
26516 B = B.getOperand(0);
26518 C = C.getOperand(0);
26522 Opcode = (!NegC) ? X86ISD::FMADD : X86ISD::FMSUB;
26524 Opcode = (!NegC) ? X86ISD::FNMADD : X86ISD::FNMSUB;
26526 return DAG.getNode(Opcode, dl, VT, A, B, C);
26529 static SDValue PerformZExtCombine(SDNode *N, SelectionDAG &DAG,
26530 TargetLowering::DAGCombinerInfo &DCI,
26531 const X86Subtarget *Subtarget) {
26532 // (i32 zext (and (i8 x86isd::setcc_carry), 1)) ->
26533 // (and (i32 x86isd::setcc_carry), 1)
26534 // This eliminates the zext. This transformation is necessary because
26535 // ISD::SETCC is always legalized to i8.
26537 SDValue N0 = N->getOperand(0);
26538 EVT VT = N->getValueType(0);
26540 if (N0.getOpcode() == ISD::AND &&
26542 N0.getOperand(0).hasOneUse()) {
26543 SDValue N00 = N0.getOperand(0);
26544 if (N00.getOpcode() == X86ISD::SETCC_CARRY) {
26545 if (!isOneConstant(N0.getOperand(1)))
26547 return DAG.getNode(ISD::AND, dl, VT,
26548 DAG.getNode(X86ISD::SETCC_CARRY, dl, VT,
26549 N00.getOperand(0), N00.getOperand(1)),
26550 DAG.getConstant(1, dl, VT));
26554 if (N0.getOpcode() == ISD::TRUNCATE &&
26556 N0.getOperand(0).hasOneUse()) {
26557 SDValue N00 = N0.getOperand(0);
26558 if (N00.getOpcode() == X86ISD::SETCC_CARRY) {
26559 return DAG.getNode(ISD::AND, dl, VT,
26560 DAG.getNode(X86ISD::SETCC_CARRY, dl, VT,
26561 N00.getOperand(0), N00.getOperand(1)),
26562 DAG.getConstant(1, dl, VT));
26566 if (VT.is256BitVector())
26567 if (SDValue R = WidenMaskArithmetic(N, DAG, DCI, Subtarget))
26570 // (i8,i32 zext (udivrem (i8 x, i8 y)) ->
26571 // (i8,i32 (udivrem_zext_hreg (i8 x, i8 y)
26572 // This exposes the zext to the udivrem lowering, so that it directly extends
26573 // from AH (which we otherwise need to do contortions to access).
26574 if (N0.getOpcode() == ISD::UDIVREM &&
26575 N0.getResNo() == 1 && N0.getValueType() == MVT::i8 &&
26576 (VT == MVT::i32 || VT == MVT::i64)) {
26577 SDVTList NodeTys = DAG.getVTList(MVT::i8, VT);
26578 SDValue R = DAG.getNode(X86ISD::UDIVREM8_ZEXT_HREG, dl, NodeTys,
26579 N0.getOperand(0), N0.getOperand(1));
26580 DAG.ReplaceAllUsesOfValueWith(N0.getValue(0), R.getValue(0));
26581 return R.getValue(1);
26587 // Optimize x == -y --> x+y == 0
26588 // x != -y --> x+y != 0
26589 static SDValue PerformISDSETCCCombine(SDNode *N, SelectionDAG &DAG,
26590 const X86Subtarget* Subtarget) {
26591 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
26592 SDValue LHS = N->getOperand(0);
26593 SDValue RHS = N->getOperand(1);
26594 EVT VT = N->getValueType(0);
26597 if ((CC == ISD::SETNE || CC == ISD::SETEQ) && LHS.getOpcode() == ISD::SUB)
26598 if (isNullConstant(LHS.getOperand(0)) && LHS.hasOneUse()) {
26599 SDValue addV = DAG.getNode(ISD::ADD, DL, LHS.getValueType(), RHS,
26600 LHS.getOperand(1));
26601 return DAG.getSetCC(DL, N->getValueType(0), addV,
26602 DAG.getConstant(0, DL, addV.getValueType()), CC);
26604 if ((CC == ISD::SETNE || CC == ISD::SETEQ) && RHS.getOpcode() == ISD::SUB)
26605 if (isNullConstant(RHS.getOperand(0)) && RHS.hasOneUse()) {
26606 SDValue addV = DAG.getNode(ISD::ADD, DL, RHS.getValueType(), LHS,
26607 RHS.getOperand(1));
26608 return DAG.getSetCC(DL, N->getValueType(0), addV,
26609 DAG.getConstant(0, DL, addV.getValueType()), CC);
26612 if (VT.getScalarType() == MVT::i1 &&
26613 (CC == ISD::SETNE || CC == ISD::SETEQ || ISD::isSignedIntSetCC(CC))) {
26615 (LHS.getOpcode() == ISD::SIGN_EXTEND) &&
26616 (LHS.getOperand(0).getValueType().getScalarType() == MVT::i1);
26617 bool IsVZero1 = ISD::isBuildVectorAllZeros(RHS.getNode());
26619 if (!IsSEXT0 || !IsVZero1) {
26620 // Swap the operands and update the condition code.
26621 std::swap(LHS, RHS);
26622 CC = ISD::getSetCCSwappedOperands(CC);
26624 IsSEXT0 = (LHS.getOpcode() == ISD::SIGN_EXTEND) &&
26625 (LHS.getOperand(0).getValueType().getScalarType() == MVT::i1);
26626 IsVZero1 = ISD::isBuildVectorAllZeros(RHS.getNode());
26629 if (IsSEXT0 && IsVZero1) {
26630 assert(VT == LHS.getOperand(0).getValueType() &&
26631 "Uexpected operand type");
26632 if (CC == ISD::SETGT)
26633 return DAG.getConstant(0, DL, VT);
26634 if (CC == ISD::SETLE)
26635 return DAG.getConstant(1, DL, VT);
26636 if (CC == ISD::SETEQ || CC == ISD::SETGE)
26637 return DAG.getNOT(DL, LHS.getOperand(0), VT);
26639 assert((CC == ISD::SETNE || CC == ISD::SETLT) &&
26640 "Unexpected condition code!");
26641 return LHS.getOperand(0);
26648 static SDValue PerformBLENDICombine(SDNode *N, SelectionDAG &DAG) {
26649 SDValue V0 = N->getOperand(0);
26650 SDValue V1 = N->getOperand(1);
26652 EVT VT = N->getValueType(0);
26654 // Canonicalize a v2f64 blend with a mask of 2 by swapping the vector
26655 // operands and changing the mask to 1. This saves us a bunch of
26656 // pattern-matching possibilities related to scalar math ops in SSE/AVX.
26657 // x86InstrInfo knows how to commute this back after instruction selection
26658 // if it would help register allocation.
26660 // TODO: If optimizing for size or a processor that doesn't suffer from
26661 // partial register update stalls, this should be transformed into a MOVSD
26662 // instruction because a MOVSD is 1-2 bytes smaller than a BLENDPD.
26664 if (VT == MVT::v2f64)
26665 if (auto *Mask = dyn_cast<ConstantSDNode>(N->getOperand(2)))
26666 if (Mask->getZExtValue() == 2 && !isShuffleFoldableLoad(V0)) {
26667 SDValue NewMask = DAG.getConstant(1, DL, MVT::i8);
26668 return DAG.getNode(X86ISD::BLENDI, DL, VT, V1, V0, NewMask);
26674 // Helper function of PerformSETCCCombine. It is to materialize "setb reg"
26675 // as "sbb reg,reg", since it can be extended without zext and produces
26676 // an all-ones bit which is more useful than 0/1 in some cases.
26677 static SDValue MaterializeSETB(SDLoc DL, SDValue EFLAGS, SelectionDAG &DAG,
26680 return DAG.getNode(ISD::AND, DL, VT,
26681 DAG.getNode(X86ISD::SETCC_CARRY, DL, MVT::i8,
26682 DAG.getConstant(X86::COND_B, DL, MVT::i8),
26684 DAG.getConstant(1, DL, VT));
26685 assert (VT == MVT::i1 && "Unexpected type for SECCC node");
26686 return DAG.getNode(ISD::TRUNCATE, DL, MVT::i1,
26687 DAG.getNode(X86ISD::SETCC_CARRY, DL, MVT::i8,
26688 DAG.getConstant(X86::COND_B, DL, MVT::i8),
26692 // Optimize RES = X86ISD::SETCC CONDCODE, EFLAG_INPUT
26693 static SDValue PerformSETCCCombine(SDNode *N, SelectionDAG &DAG,
26694 TargetLowering::DAGCombinerInfo &DCI,
26695 const X86Subtarget *Subtarget) {
26697 X86::CondCode CC = X86::CondCode(N->getConstantOperandVal(0));
26698 SDValue EFLAGS = N->getOperand(1);
26700 if (CC == X86::COND_A) {
26701 // Try to convert COND_A into COND_B in an attempt to facilitate
26702 // materializing "setb reg".
26704 // Do not flip "e > c", where "c" is a constant, because Cmp instruction
26705 // cannot take an immediate as its first operand.
26707 if (EFLAGS.getOpcode() == X86ISD::SUB && EFLAGS.hasOneUse() &&
26708 EFLAGS.getValueType().isInteger() &&
26709 !isa<ConstantSDNode>(EFLAGS.getOperand(1))) {
26710 SDValue NewSub = DAG.getNode(X86ISD::SUB, SDLoc(EFLAGS),
26711 EFLAGS.getNode()->getVTList(),
26712 EFLAGS.getOperand(1), EFLAGS.getOperand(0));
26713 SDValue NewEFLAGS = SDValue(NewSub.getNode(), EFLAGS.getResNo());
26714 return MaterializeSETB(DL, NewEFLAGS, DAG, N->getSimpleValueType(0));
26718 // Materialize "setb reg" as "sbb reg,reg", since it can be extended without
26719 // a zext and produces an all-ones bit which is more useful than 0/1 in some
26721 if (CC == X86::COND_B)
26722 return MaterializeSETB(DL, EFLAGS, DAG, N->getSimpleValueType(0));
26724 if (SDValue Flags = checkBoolTestSetCCCombine(EFLAGS, CC)) {
26725 SDValue Cond = DAG.getConstant(CC, DL, MVT::i8);
26726 return DAG.getNode(X86ISD::SETCC, DL, N->getVTList(), Cond, Flags);
26732 // Optimize branch condition evaluation.
26734 static SDValue PerformBrCondCombine(SDNode *N, SelectionDAG &DAG,
26735 TargetLowering::DAGCombinerInfo &DCI,
26736 const X86Subtarget *Subtarget) {
26738 SDValue Chain = N->getOperand(0);
26739 SDValue Dest = N->getOperand(1);
26740 SDValue EFLAGS = N->getOperand(3);
26741 X86::CondCode CC = X86::CondCode(N->getConstantOperandVal(2));
26743 if (SDValue Flags = checkBoolTestSetCCCombine(EFLAGS, CC)) {
26744 SDValue Cond = DAG.getConstant(CC, DL, MVT::i8);
26745 return DAG.getNode(X86ISD::BRCOND, DL, N->getVTList(), Chain, Dest, Cond,
26752 static SDValue performVectorCompareAndMaskUnaryOpCombine(SDNode *N,
26753 SelectionDAG &DAG) {
26754 // Take advantage of vector comparisons producing 0 or -1 in each lane to
26755 // optimize away operation when it's from a constant.
26757 // The general transformation is:
26758 // UNARYOP(AND(VECTOR_CMP(x,y), constant)) -->
26759 // AND(VECTOR_CMP(x,y), constant2)
26760 // constant2 = UNARYOP(constant)
26762 // Early exit if this isn't a vector operation, the operand of the
26763 // unary operation isn't a bitwise AND, or if the sizes of the operations
26764 // aren't the same.
26765 EVT VT = N->getValueType(0);
26766 if (!VT.isVector() || N->getOperand(0)->getOpcode() != ISD::AND ||
26767 N->getOperand(0)->getOperand(0)->getOpcode() != ISD::SETCC ||
26768 VT.getSizeInBits() != N->getOperand(0)->getValueType(0).getSizeInBits())
26771 // Now check that the other operand of the AND is a constant. We could
26772 // make the transformation for non-constant splats as well, but it's unclear
26773 // that would be a benefit as it would not eliminate any operations, just
26774 // perform one more step in scalar code before moving to the vector unit.
26775 if (BuildVectorSDNode *BV =
26776 dyn_cast<BuildVectorSDNode>(N->getOperand(0)->getOperand(1))) {
26777 // Bail out if the vector isn't a constant.
26778 if (!BV->isConstant())
26781 // Everything checks out. Build up the new and improved node.
26783 EVT IntVT = BV->getValueType(0);
26784 // Create a new constant of the appropriate type for the transformed
26786 SDValue SourceConst = DAG.getNode(N->getOpcode(), DL, VT, SDValue(BV, 0));
26787 // The AND node needs bitcasts to/from an integer vector type around it.
26788 SDValue MaskConst = DAG.getBitcast(IntVT, SourceConst);
26789 SDValue NewAnd = DAG.getNode(ISD::AND, DL, IntVT,
26790 N->getOperand(0)->getOperand(0), MaskConst);
26791 SDValue Res = DAG.getBitcast(VT, NewAnd);
26798 static SDValue PerformUINT_TO_FPCombine(SDNode *N, SelectionDAG &DAG,
26799 const X86Subtarget *Subtarget) {
26800 SDValue Op0 = N->getOperand(0);
26801 EVT VT = N->getValueType(0);
26802 EVT InVT = Op0.getValueType();
26803 EVT InSVT = InVT.getScalarType();
26804 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
26806 // UINT_TO_FP(vXi8) -> SINT_TO_FP(ZEXT(vXi8 to vXi32))
26807 // UINT_TO_FP(vXi16) -> SINT_TO_FP(ZEXT(vXi16 to vXi32))
26808 if (InVT.isVector() && (InSVT == MVT::i8 || InSVT == MVT::i16)) {
26810 EVT DstVT = EVT::getVectorVT(*DAG.getContext(), MVT::i32,
26811 InVT.getVectorNumElements());
26812 SDValue P = DAG.getNode(ISD::ZERO_EXTEND, dl, DstVT, Op0);
26814 if (TLI.isOperationLegal(ISD::UINT_TO_FP, DstVT))
26815 return DAG.getNode(ISD::UINT_TO_FP, dl, VT, P);
26817 return DAG.getNode(ISD::SINT_TO_FP, dl, VT, P);
26823 static SDValue PerformSINT_TO_FPCombine(SDNode *N, SelectionDAG &DAG,
26824 const X86Subtarget *Subtarget) {
26825 // First try to optimize away the conversion entirely when it's
26826 // conditionally from a constant. Vectors only.
26827 if (SDValue Res = performVectorCompareAndMaskUnaryOpCombine(N, DAG))
26830 // Now move on to more general possibilities.
26831 SDValue Op0 = N->getOperand(0);
26832 EVT VT = N->getValueType(0);
26833 EVT InVT = Op0.getValueType();
26834 EVT InSVT = InVT.getScalarType();
26836 // SINT_TO_FP(vXi8) -> SINT_TO_FP(SEXT(vXi8 to vXi32))
26837 // SINT_TO_FP(vXi16) -> SINT_TO_FP(SEXT(vXi16 to vXi32))
26838 if (InVT.isVector() && (InSVT == MVT::i8 || InSVT == MVT::i16)) {
26840 EVT DstVT = EVT::getVectorVT(*DAG.getContext(), MVT::i32,
26841 InVT.getVectorNumElements());
26842 SDValue P = DAG.getNode(ISD::SIGN_EXTEND, dl, DstVT, Op0);
26843 return DAG.getNode(ISD::SINT_TO_FP, dl, VT, P);
26846 // Transform (SINT_TO_FP (i64 ...)) into an x87 operation if we have
26847 // a 32-bit target where SSE doesn't support i64->FP operations.
26848 if (!Subtarget->useSoftFloat() && Op0.getOpcode() == ISD::LOAD) {
26849 LoadSDNode *Ld = cast<LoadSDNode>(Op0.getNode());
26850 EVT LdVT = Ld->getValueType(0);
26852 // This transformation is not supported if the result type is f16
26853 if (VT == MVT::f16)
26856 if (!Ld->isVolatile() && !VT.isVector() &&
26857 ISD::isNON_EXTLoad(Op0.getNode()) && Op0.hasOneUse() &&
26858 !Subtarget->is64Bit() && LdVT == MVT::i64) {
26859 SDValue FILDChain = Subtarget->getTargetLowering()->BuildFILD(
26860 SDValue(N, 0), LdVT, Ld->getChain(), Op0, DAG);
26861 DAG.ReplaceAllUsesOfValueWith(Op0.getValue(1), FILDChain.getValue(1));
26868 // Optimize RES, EFLAGS = X86ISD::ADC LHS, RHS, EFLAGS
26869 static SDValue PerformADCCombine(SDNode *N, SelectionDAG &DAG,
26870 X86TargetLowering::DAGCombinerInfo &DCI) {
26871 // If the LHS and RHS of the ADC node are zero, then it can't overflow and
26872 // the result is either zero or one (depending on the input carry bit).
26873 // Strength reduce this down to a "set on carry" aka SETCC_CARRY&1.
26874 if (X86::isZeroNode(N->getOperand(0)) &&
26875 X86::isZeroNode(N->getOperand(1)) &&
26876 // We don't have a good way to replace an EFLAGS use, so only do this when
26878 SDValue(N, 1).use_empty()) {
26880 EVT VT = N->getValueType(0);
26881 SDValue CarryOut = DAG.getConstant(0, DL, N->getValueType(1));
26882 SDValue Res1 = DAG.getNode(ISD::AND, DL, VT,
26883 DAG.getNode(X86ISD::SETCC_CARRY, DL, VT,
26884 DAG.getConstant(X86::COND_B, DL,
26887 DAG.getConstant(1, DL, VT));
26888 return DCI.CombineTo(N, Res1, CarryOut);
26894 // fold (add Y, (sete X, 0)) -> adc 0, Y
26895 // (add Y, (setne X, 0)) -> sbb -1, Y
26896 // (sub (sete X, 0), Y) -> sbb 0, Y
26897 // (sub (setne X, 0), Y) -> adc -1, Y
26898 static SDValue OptimizeConditionalInDecrement(SDNode *N, SelectionDAG &DAG) {
26901 // Look through ZExts.
26902 SDValue Ext = N->getOperand(N->getOpcode() == ISD::SUB ? 1 : 0);
26903 if (Ext.getOpcode() != ISD::ZERO_EXTEND || !Ext.hasOneUse())
26906 SDValue SetCC = Ext.getOperand(0);
26907 if (SetCC.getOpcode() != X86ISD::SETCC || !SetCC.hasOneUse())
26910 X86::CondCode CC = (X86::CondCode)SetCC.getConstantOperandVal(0);
26911 if (CC != X86::COND_E && CC != X86::COND_NE)
26914 SDValue Cmp = SetCC.getOperand(1);
26915 if (Cmp.getOpcode() != X86ISD::CMP || !Cmp.hasOneUse() ||
26916 !X86::isZeroNode(Cmp.getOperand(1)) ||
26917 !Cmp.getOperand(0).getValueType().isInteger())
26920 SDValue CmpOp0 = Cmp.getOperand(0);
26921 SDValue NewCmp = DAG.getNode(X86ISD::CMP, DL, MVT::i32, CmpOp0,
26922 DAG.getConstant(1, DL, CmpOp0.getValueType()));
26924 SDValue OtherVal = N->getOperand(N->getOpcode() == ISD::SUB ? 0 : 1);
26925 if (CC == X86::COND_NE)
26926 return DAG.getNode(N->getOpcode() == ISD::SUB ? X86ISD::ADC : X86ISD::SBB,
26927 DL, OtherVal.getValueType(), OtherVal,
26928 DAG.getConstant(-1ULL, DL, OtherVal.getValueType()),
26930 return DAG.getNode(N->getOpcode() == ISD::SUB ? X86ISD::SBB : X86ISD::ADC,
26931 DL, OtherVal.getValueType(), OtherVal,
26932 DAG.getConstant(0, DL, OtherVal.getValueType()), NewCmp);
26935 /// PerformADDCombine - Do target-specific dag combines on integer adds.
26936 static SDValue PerformAddCombine(SDNode *N, SelectionDAG &DAG,
26937 const X86Subtarget *Subtarget) {
26938 EVT VT = N->getValueType(0);
26939 SDValue Op0 = N->getOperand(0);
26940 SDValue Op1 = N->getOperand(1);
26942 // Try to synthesize horizontal adds from adds of shuffles.
26943 if (((Subtarget->hasSSSE3() && (VT == MVT::v8i16 || VT == MVT::v4i32)) ||
26944 (Subtarget->hasInt256() && (VT == MVT::v16i16 || VT == MVT::v8i32))) &&
26945 isHorizontalBinOp(Op0, Op1, true))
26946 return DAG.getNode(X86ISD::HADD, SDLoc(N), VT, Op0, Op1);
26948 return OptimizeConditionalInDecrement(N, DAG);
26951 static SDValue PerformSubCombine(SDNode *N, SelectionDAG &DAG,
26952 const X86Subtarget *Subtarget) {
26953 SDValue Op0 = N->getOperand(0);
26954 SDValue Op1 = N->getOperand(1);
26956 // X86 can't encode an immediate LHS of a sub. See if we can push the
26957 // negation into a preceding instruction.
26958 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op0)) {
26959 // If the RHS of the sub is a XOR with one use and a constant, invert the
26960 // immediate. Then add one to the LHS of the sub so we can turn
26961 // X-Y -> X+~Y+1, saving one register.
26962 if (Op1->hasOneUse() && Op1.getOpcode() == ISD::XOR &&
26963 isa<ConstantSDNode>(Op1.getOperand(1))) {
26964 APInt XorC = cast<ConstantSDNode>(Op1.getOperand(1))->getAPIntValue();
26965 EVT VT = Op0.getValueType();
26966 SDValue NewXor = DAG.getNode(ISD::XOR, SDLoc(Op1), VT,
26968 DAG.getConstant(~XorC, SDLoc(Op1), VT));
26969 return DAG.getNode(ISD::ADD, SDLoc(N), VT, NewXor,
26970 DAG.getConstant(C->getAPIntValue() + 1, SDLoc(N), VT));
26974 // Try to synthesize horizontal adds from adds of shuffles.
26975 EVT VT = N->getValueType(0);
26976 if (((Subtarget->hasSSSE3() && (VT == MVT::v8i16 || VT == MVT::v4i32)) ||
26977 (Subtarget->hasInt256() && (VT == MVT::v16i16 || VT == MVT::v8i32))) &&
26978 isHorizontalBinOp(Op0, Op1, true))
26979 return DAG.getNode(X86ISD::HSUB, SDLoc(N), VT, Op0, Op1);
26981 return OptimizeConditionalInDecrement(N, DAG);
26984 /// performVZEXTCombine - Performs build vector combines
26985 static SDValue performVZEXTCombine(SDNode *N, SelectionDAG &DAG,
26986 TargetLowering::DAGCombinerInfo &DCI,
26987 const X86Subtarget *Subtarget) {
26989 MVT VT = N->getSimpleValueType(0);
26990 SDValue Op = N->getOperand(0);
26991 MVT OpVT = Op.getSimpleValueType();
26992 MVT OpEltVT = OpVT.getVectorElementType();
26993 unsigned InputBits = OpEltVT.getSizeInBits() * VT.getVectorNumElements();
26995 // (vzext (bitcast (vzext (x)) -> (vzext x)
26997 while (V.getOpcode() == ISD::BITCAST)
26998 V = V.getOperand(0);
27000 if (V != Op && V.getOpcode() == X86ISD::VZEXT) {
27001 MVT InnerVT = V.getSimpleValueType();
27002 MVT InnerEltVT = InnerVT.getVectorElementType();
27004 // If the element sizes match exactly, we can just do one larger vzext. This
27005 // is always an exact type match as vzext operates on integer types.
27006 if (OpEltVT == InnerEltVT) {
27007 assert(OpVT == InnerVT && "Types must match for vzext!");
27008 return DAG.getNode(X86ISD::VZEXT, DL, VT, V.getOperand(0));
27011 // The only other way we can combine them is if only a single element of the
27012 // inner vzext is used in the input to the outer vzext.
27013 if (InnerEltVT.getSizeInBits() < InputBits)
27016 // In this case, the inner vzext is completely dead because we're going to
27017 // only look at bits inside of the low element. Just do the outer vzext on
27018 // a bitcast of the input to the inner.
27019 return DAG.getNode(X86ISD::VZEXT, DL, VT, DAG.getBitcast(OpVT, V));
27022 // Check if we can bypass extracting and re-inserting an element of an input
27023 // vector. Essentially:
27024 // (bitcast (sclr2vec (ext_vec_elt x))) -> (bitcast x)
27025 if (V.getOpcode() == ISD::SCALAR_TO_VECTOR &&
27026 V.getOperand(0).getOpcode() == ISD::EXTRACT_VECTOR_ELT &&
27027 V.getOperand(0).getSimpleValueType().getSizeInBits() == InputBits) {
27028 SDValue ExtractedV = V.getOperand(0);
27029 SDValue OrigV = ExtractedV.getOperand(0);
27030 if (isNullConstant(ExtractedV.getOperand(1))) {
27031 MVT OrigVT = OrigV.getSimpleValueType();
27032 // Extract a subvector if necessary...
27033 if (OrigVT.getSizeInBits() > OpVT.getSizeInBits()) {
27034 int Ratio = OrigVT.getSizeInBits() / OpVT.getSizeInBits();
27035 OrigVT = MVT::getVectorVT(OrigVT.getVectorElementType(),
27036 OrigVT.getVectorNumElements() / Ratio);
27037 OrigV = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, OrigVT, OrigV,
27038 DAG.getIntPtrConstant(0, DL));
27040 Op = DAG.getBitcast(OpVT, OrigV);
27041 return DAG.getNode(X86ISD::VZEXT, DL, VT, Op);
27048 SDValue X86TargetLowering::PerformDAGCombine(SDNode *N,
27049 DAGCombinerInfo &DCI) const {
27050 SelectionDAG &DAG = DCI.DAG;
27051 switch (N->getOpcode()) {
27053 case ISD::EXTRACT_VECTOR_ELT:
27054 return PerformEXTRACT_VECTOR_ELTCombine(N, DAG, DCI);
27057 case X86ISD::SHRUNKBLEND:
27058 return PerformSELECTCombine(N, DAG, DCI, Subtarget);
27059 case ISD::BITCAST: return PerformBITCASTCombine(N, DAG, Subtarget);
27060 case X86ISD::CMOV: return PerformCMOVCombine(N, DAG, DCI, Subtarget);
27061 case ISD::ADD: return PerformAddCombine(N, DAG, Subtarget);
27062 case ISD::SUB: return PerformSubCombine(N, DAG, Subtarget);
27063 case X86ISD::ADC: return PerformADCCombine(N, DAG, DCI);
27064 case ISD::MUL: return PerformMulCombine(N, DAG, DCI);
27067 case ISD::SRL: return PerformShiftCombine(N, DAG, DCI, Subtarget);
27068 case ISD::AND: return PerformAndCombine(N, DAG, DCI, Subtarget);
27069 case ISD::OR: return PerformOrCombine(N, DAG, DCI, Subtarget);
27070 case ISD::XOR: return PerformXorCombine(N, DAG, DCI, Subtarget);
27071 case ISD::LOAD: return PerformLOADCombine(N, DAG, DCI, Subtarget);
27072 case ISD::MLOAD: return PerformMLOADCombine(N, DAG, DCI, Subtarget);
27073 case ISD::STORE: return PerformSTORECombine(N, DAG, Subtarget);
27074 case ISD::MSTORE: return PerformMSTORECombine(N, DAG, Subtarget);
27075 case ISD::SINT_TO_FP: return PerformSINT_TO_FPCombine(N, DAG, Subtarget);
27076 case ISD::UINT_TO_FP: return PerformUINT_TO_FPCombine(N, DAG, Subtarget);
27077 case ISD::FADD: return PerformFADDCombine(N, DAG, Subtarget);
27078 case ISD::FSUB: return PerformFSUBCombine(N, DAG, Subtarget);
27079 case ISD::FNEG: return PerformFNEGCombine(N, DAG, Subtarget);
27080 case ISD::TRUNCATE: return PerformTRUNCATECombine(N, DAG, Subtarget);
27082 case X86ISD::FOR: return PerformFORCombine(N, DAG, Subtarget);
27084 case X86ISD::FMAX: return PerformFMinFMaxCombine(N, DAG);
27085 case X86ISD::FAND: return PerformFANDCombine(N, DAG);
27086 case X86ISD::FANDN: return PerformFANDNCombine(N, DAG);
27087 case X86ISD::BT: return PerformBTCombine(N, DAG, DCI);
27088 case X86ISD::VZEXT_MOVL: return PerformVZEXT_MOVLCombine(N, DAG);
27089 case ISD::ANY_EXTEND:
27090 case ISD::ZERO_EXTEND: return PerformZExtCombine(N, DAG, DCI, Subtarget);
27091 case ISD::SIGN_EXTEND: return PerformSExtCombine(N, DAG, DCI, Subtarget);
27092 case ISD::SIGN_EXTEND_INREG:
27093 return PerformSIGN_EXTEND_INREGCombine(N, DAG, Subtarget);
27094 case ISD::SETCC: return PerformISDSETCCCombine(N, DAG, Subtarget);
27095 case X86ISD::SETCC: return PerformSETCCCombine(N, DAG, DCI, Subtarget);
27096 case X86ISD::BRCOND: return PerformBrCondCombine(N, DAG, DCI, Subtarget);
27097 case X86ISD::VZEXT: return performVZEXTCombine(N, DAG, DCI, Subtarget);
27098 case X86ISD::SHUFP: // Handle all target specific shuffles
27099 case X86ISD::PALIGNR:
27100 case X86ISD::UNPCKH:
27101 case X86ISD::UNPCKL:
27102 case X86ISD::MOVHLPS:
27103 case X86ISD::MOVLHPS:
27104 case X86ISD::PSHUFB:
27105 case X86ISD::PSHUFD:
27106 case X86ISD::PSHUFHW:
27107 case X86ISD::PSHUFLW:
27108 case X86ISD::MOVSS:
27109 case X86ISD::MOVSD:
27110 case X86ISD::VPERMILPI:
27111 case X86ISD::VPERM2X128:
27112 case ISD::VECTOR_SHUFFLE: return PerformShuffleCombine(N, DAG, DCI,Subtarget);
27113 case ISD::FMA: return PerformFMACombine(N, DAG, Subtarget);
27114 case X86ISD::BLENDI: return PerformBLENDICombine(N, DAG);
27120 /// isTypeDesirableForOp - Return true if the target has native support for
27121 /// the specified value type and it is 'desirable' to use the type for the
27122 /// given node type. e.g. On x86 i16 is legal, but undesirable since i16
27123 /// instruction encodings are longer and some i16 instructions are slow.
27124 bool X86TargetLowering::isTypeDesirableForOp(unsigned Opc, EVT VT) const {
27125 if (!isTypeLegal(VT))
27127 if (VT != MVT::i16)
27134 case ISD::SIGN_EXTEND:
27135 case ISD::ZERO_EXTEND:
27136 case ISD::ANY_EXTEND:
27149 /// IsDesirableToPromoteOp - This method query the target whether it is
27150 /// beneficial for dag combiner to promote the specified node. If true, it
27151 /// should return the desired promotion type by reference.
27152 bool X86TargetLowering::IsDesirableToPromoteOp(SDValue Op, EVT &PVT) const {
27153 EVT VT = Op.getValueType();
27154 if (VT != MVT::i16)
27157 bool Promote = false;
27158 bool Commute = false;
27159 switch (Op.getOpcode()) {
27162 LoadSDNode *LD = cast<LoadSDNode>(Op);
27163 // If the non-extending load has a single use and it's not live out, then it
27164 // might be folded.
27165 if (LD->getExtensionType() == ISD::NON_EXTLOAD /*&&
27166 Op.hasOneUse()*/) {
27167 for (SDNode::use_iterator UI = Op.getNode()->use_begin(),
27168 UE = Op.getNode()->use_end(); UI != UE; ++UI) {
27169 // The only case where we'd want to promote LOAD (rather then it being
27170 // promoted as an operand is when it's only use is liveout.
27171 if (UI->getOpcode() != ISD::CopyToReg)
27178 case ISD::SIGN_EXTEND:
27179 case ISD::ZERO_EXTEND:
27180 case ISD::ANY_EXTEND:
27185 SDValue N0 = Op.getOperand(0);
27186 // Look out for (store (shl (load), x)).
27187 if (MayFoldLoad(N0) && MayFoldIntoStore(Op))
27200 SDValue N0 = Op.getOperand(0);
27201 SDValue N1 = Op.getOperand(1);
27202 if (!Commute && MayFoldLoad(N1))
27204 // Avoid disabling potential load folding opportunities.
27205 if (MayFoldLoad(N0) && (!isa<ConstantSDNode>(N1) || MayFoldIntoStore(Op)))
27207 if (MayFoldLoad(N1) && (!isa<ConstantSDNode>(N0) || MayFoldIntoStore(Op)))
27217 //===----------------------------------------------------------------------===//
27218 // X86 Inline Assembly Support
27219 //===----------------------------------------------------------------------===//
27221 // Helper to match a string separated by whitespace.
27222 static bool matchAsm(StringRef S, ArrayRef<const char *> Pieces) {
27223 S = S.substr(S.find_first_not_of(" \t")); // Skip leading whitespace.
27225 for (StringRef Piece : Pieces) {
27226 if (!S.startswith(Piece)) // Check if the piece matches.
27229 S = S.substr(Piece.size());
27230 StringRef::size_type Pos = S.find_first_not_of(" \t");
27231 if (Pos == 0) // We matched a prefix.
27240 static bool clobbersFlagRegisters(const SmallVector<StringRef, 4> &AsmPieces) {
27242 if (AsmPieces.size() == 3 || AsmPieces.size() == 4) {
27243 if (std::count(AsmPieces.begin(), AsmPieces.end(), "~{cc}") &&
27244 std::count(AsmPieces.begin(), AsmPieces.end(), "~{flags}") &&
27245 std::count(AsmPieces.begin(), AsmPieces.end(), "~{fpsr}")) {
27247 if (AsmPieces.size() == 3)
27249 else if (std::count(AsmPieces.begin(), AsmPieces.end(), "~{dirflag}"))
27256 bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
27257 InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
27259 std::string AsmStr = IA->getAsmString();
27261 IntegerType *Ty = dyn_cast<IntegerType>(CI->getType());
27262 if (!Ty || Ty->getBitWidth() % 16 != 0)
27265 // TODO: should remove alternatives from the asmstring: "foo {a|b}" -> "foo a"
27266 SmallVector<StringRef, 4> AsmPieces;
27267 SplitString(AsmStr, AsmPieces, ";\n");
27269 switch (AsmPieces.size()) {
27270 default: return false;
27272 // FIXME: this should verify that we are targeting a 486 or better. If not,
27273 // we will turn this bswap into something that will be lowered to logical
27274 // ops instead of emitting the bswap asm. For now, we don't support 486 or
27275 // lower so don't worry about this.
27277 if (matchAsm(AsmPieces[0], {"bswap", "$0"}) ||
27278 matchAsm(AsmPieces[0], {"bswapl", "$0"}) ||
27279 matchAsm(AsmPieces[0], {"bswapq", "$0"}) ||
27280 matchAsm(AsmPieces[0], {"bswap", "${0:q}"}) ||
27281 matchAsm(AsmPieces[0], {"bswapl", "${0:q}"}) ||
27282 matchAsm(AsmPieces[0], {"bswapq", "${0:q}"})) {
27283 // No need to check constraints, nothing other than the equivalent of
27284 // "=r,0" would be valid here.
27285 return IntrinsicLowering::LowerToByteSwap(CI);
27288 // rorw $$8, ${0:w} --> llvm.bswap.i16
27289 if (CI->getType()->isIntegerTy(16) &&
27290 IA->getConstraintString().compare(0, 5, "=r,0,") == 0 &&
27291 (matchAsm(AsmPieces[0], {"rorw", "$$8,", "${0:w}"}) ||
27292 matchAsm(AsmPieces[0], {"rolw", "$$8,", "${0:w}"}))) {
27294 StringRef ConstraintsStr = IA->getConstraintString();
27295 SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
27296 array_pod_sort(AsmPieces.begin(), AsmPieces.end());
27297 if (clobbersFlagRegisters(AsmPieces))
27298 return IntrinsicLowering::LowerToByteSwap(CI);
27302 if (CI->getType()->isIntegerTy(32) &&
27303 IA->getConstraintString().compare(0, 5, "=r,0,") == 0 &&
27304 matchAsm(AsmPieces[0], {"rorw", "$$8,", "${0:w}"}) &&
27305 matchAsm(AsmPieces[1], {"rorl", "$$16,", "$0"}) &&
27306 matchAsm(AsmPieces[2], {"rorw", "$$8,", "${0:w}"})) {
27308 StringRef ConstraintsStr = IA->getConstraintString();
27309 SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
27310 array_pod_sort(AsmPieces.begin(), AsmPieces.end());
27311 if (clobbersFlagRegisters(AsmPieces))
27312 return IntrinsicLowering::LowerToByteSwap(CI);
27315 if (CI->getType()->isIntegerTy(64)) {
27316 InlineAsm::ConstraintInfoVector Constraints = IA->ParseConstraints();
27317 if (Constraints.size() >= 2 &&
27318 Constraints[0].Codes.size() == 1 && Constraints[0].Codes[0] == "A" &&
27319 Constraints[1].Codes.size() == 1 && Constraints[1].Codes[0] == "0") {
27320 // bswap %eax / bswap %edx / xchgl %eax, %edx -> llvm.bswap.i64
27321 if (matchAsm(AsmPieces[0], {"bswap", "%eax"}) &&
27322 matchAsm(AsmPieces[1], {"bswap", "%edx"}) &&
27323 matchAsm(AsmPieces[2], {"xchgl", "%eax,", "%edx"}))
27324 return IntrinsicLowering::LowerToByteSwap(CI);
27332 /// getConstraintType - Given a constraint letter, return the type of
27333 /// constraint it is for this target.
27334 X86TargetLowering::ConstraintType
27335 X86TargetLowering::getConstraintType(StringRef Constraint) const {
27336 if (Constraint.size() == 1) {
27337 switch (Constraint[0]) {
27348 return C_RegisterClass;
27372 return TargetLowering::getConstraintType(Constraint);
27375 /// Examine constraint type and operand type and determine a weight value.
27376 /// This object must already have been set up with the operand type
27377 /// and the current alternative constraint selected.
27378 TargetLowering::ConstraintWeight
27379 X86TargetLowering::getSingleConstraintMatchWeight(
27380 AsmOperandInfo &info, const char *constraint) const {
27381 ConstraintWeight weight = CW_Invalid;
27382 Value *CallOperandVal = info.CallOperandVal;
27383 // If we don't have a value, we can't do a match,
27384 // but allow it at the lowest weight.
27385 if (!CallOperandVal)
27387 Type *type = CallOperandVal->getType();
27388 // Look at the constraint type.
27389 switch (*constraint) {
27391 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
27402 if (CallOperandVal->getType()->isIntegerTy())
27403 weight = CW_SpecificReg;
27408 if (type->isFloatingPointTy())
27409 weight = CW_SpecificReg;
27412 if (type->isX86_MMXTy() && Subtarget->hasMMX())
27413 weight = CW_SpecificReg;
27417 if (((type->getPrimitiveSizeInBits() == 128) && Subtarget->hasSSE1()) ||
27418 ((type->getPrimitiveSizeInBits() == 256) && Subtarget->hasFp256()))
27419 weight = CW_Register;
27422 if (ConstantInt *C = dyn_cast<ConstantInt>(info.CallOperandVal)) {
27423 if (C->getZExtValue() <= 31)
27424 weight = CW_Constant;
27428 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
27429 if (C->getZExtValue() <= 63)
27430 weight = CW_Constant;
27434 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
27435 if ((C->getSExtValue() >= -0x80) && (C->getSExtValue() <= 0x7f))
27436 weight = CW_Constant;
27440 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
27441 if ((C->getZExtValue() == 0xff) || (C->getZExtValue() == 0xffff))
27442 weight = CW_Constant;
27446 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
27447 if (C->getZExtValue() <= 3)
27448 weight = CW_Constant;
27452 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
27453 if (C->getZExtValue() <= 0xff)
27454 weight = CW_Constant;
27459 if (isa<ConstantFP>(CallOperandVal)) {
27460 weight = CW_Constant;
27464 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
27465 if ((C->getSExtValue() >= -0x80000000LL) &&
27466 (C->getSExtValue() <= 0x7fffffffLL))
27467 weight = CW_Constant;
27471 if (ConstantInt *C = dyn_cast<ConstantInt>(CallOperandVal)) {
27472 if (C->getZExtValue() <= 0xffffffff)
27473 weight = CW_Constant;
27480 /// LowerXConstraint - try to replace an X constraint, which matches anything,
27481 /// with another that has more specific requirements based on the type of the
27482 /// corresponding operand.
27483 const char *X86TargetLowering::
27484 LowerXConstraint(EVT ConstraintVT) const {
27485 // FP X constraints get lowered to SSE1/2 registers if available, otherwise
27486 // 'f' like normal targets.
27487 if (ConstraintVT.isFloatingPoint()) {
27488 if (Subtarget->hasSSE2())
27490 if (Subtarget->hasSSE1())
27494 return TargetLowering::LowerXConstraint(ConstraintVT);
27497 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
27498 /// vector. If it is invalid, don't add anything to Ops.
27499 void X86TargetLowering::LowerAsmOperandForConstraint(SDValue Op,
27500 std::string &Constraint,
27501 std::vector<SDValue>&Ops,
27502 SelectionDAG &DAG) const {
27505 // Only support length 1 constraints for now.
27506 if (Constraint.length() > 1) return;
27508 char ConstraintLetter = Constraint[0];
27509 switch (ConstraintLetter) {
27512 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27513 if (C->getZExtValue() <= 31) {
27514 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
27515 Op.getValueType());
27521 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27522 if (C->getZExtValue() <= 63) {
27523 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
27524 Op.getValueType());
27530 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27531 if (isInt<8>(C->getSExtValue())) {
27532 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
27533 Op.getValueType());
27539 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27540 if (C->getZExtValue() == 0xff || C->getZExtValue() == 0xffff ||
27541 (Subtarget->is64Bit() && C->getZExtValue() == 0xffffffff)) {
27542 Result = DAG.getTargetConstant(C->getSExtValue(), SDLoc(Op),
27543 Op.getValueType());
27549 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27550 if (C->getZExtValue() <= 3) {
27551 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
27552 Op.getValueType());
27558 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27559 if (C->getZExtValue() <= 255) {
27560 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
27561 Op.getValueType());
27567 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27568 if (C->getZExtValue() <= 127) {
27569 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
27570 Op.getValueType());
27576 // 32-bit signed value
27577 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27578 if (ConstantInt::isValueValidForType(Type::getInt32Ty(*DAG.getContext()),
27579 C->getSExtValue())) {
27580 // Widen to 64 bits here to get it sign extended.
27581 Result = DAG.getTargetConstant(C->getSExtValue(), SDLoc(Op), MVT::i64);
27584 // FIXME gcc accepts some relocatable values here too, but only in certain
27585 // memory models; it's complicated.
27590 // 32-bit unsigned value
27591 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
27592 if (ConstantInt::isValueValidForType(Type::getInt32Ty(*DAG.getContext()),
27593 C->getZExtValue())) {
27594 Result = DAG.getTargetConstant(C->getZExtValue(), SDLoc(Op),
27595 Op.getValueType());
27599 // FIXME gcc accepts some relocatable values here too, but only in certain
27600 // memory models; it's complicated.
27604 // Literal immediates are always ok.
27605 if (ConstantSDNode *CST = dyn_cast<ConstantSDNode>(Op)) {
27606 // Widen to 64 bits here to get it sign extended.
27607 Result = DAG.getTargetConstant(CST->getSExtValue(), SDLoc(Op), MVT::i64);
27611 // In any sort of PIC mode addresses need to be computed at runtime by
27612 // adding in a register or some sort of table lookup. These can't
27613 // be used as immediates.
27614 if (Subtarget->isPICStyleGOT() || Subtarget->isPICStyleStubPIC())
27617 // If we are in non-pic codegen mode, we allow the address of a global (with
27618 // an optional displacement) to be used with 'i'.
27619 GlobalAddressSDNode *GA = nullptr;
27620 int64_t Offset = 0;
27622 // Match either (GA), (GA+C), (GA+C1+C2), etc.
27624 if ((GA = dyn_cast<GlobalAddressSDNode>(Op))) {
27625 Offset += GA->getOffset();
27627 } else if (Op.getOpcode() == ISD::ADD) {
27628 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
27629 Offset += C->getZExtValue();
27630 Op = Op.getOperand(0);
27633 } else if (Op.getOpcode() == ISD::SUB) {
27634 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
27635 Offset += -C->getZExtValue();
27636 Op = Op.getOperand(0);
27641 // Otherwise, this isn't something we can handle, reject it.
27645 const GlobalValue *GV = GA->getGlobal();
27646 // If we require an extra load to get this address, as in PIC mode, we
27647 // can't accept it.
27648 if (isGlobalStubReference(
27649 Subtarget->ClassifyGlobalReference(GV, DAG.getTarget())))
27652 Result = DAG.getTargetGlobalAddress(GV, SDLoc(Op),
27653 GA->getValueType(0), Offset);
27658 if (Result.getNode()) {
27659 Ops.push_back(Result);
27662 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
27665 std::pair<unsigned, const TargetRegisterClass *>
27666 X86TargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
27667 StringRef Constraint,
27669 // First, see if this is a constraint that directly corresponds to an LLVM
27671 if (Constraint.size() == 1) {
27672 // GCC Constraint Letters
27673 switch (Constraint[0]) {
27675 // TODO: Slight differences here in allocation order and leaving
27676 // RIP in the class. Do they matter any more here than they do
27677 // in the normal allocation?
27678 case 'q': // GENERAL_REGS in 64-bit mode, Q_REGS in 32-bit mode.
27679 if (Subtarget->is64Bit()) {
27680 if (VT == MVT::i32 || VT == MVT::f32)
27681 return std::make_pair(0U, &X86::GR32RegClass);
27682 if (VT == MVT::i16)
27683 return std::make_pair(0U, &X86::GR16RegClass);
27684 if (VT == MVT::i8 || VT == MVT::i1)
27685 return std::make_pair(0U, &X86::GR8RegClass);
27686 if (VT == MVT::i64 || VT == MVT::f64)
27687 return std::make_pair(0U, &X86::GR64RegClass);
27690 // 32-bit fallthrough
27691 case 'Q': // Q_REGS
27692 if (VT == MVT::i32 || VT == MVT::f32)
27693 return std::make_pair(0U, &X86::GR32_ABCDRegClass);
27694 if (VT == MVT::i16)
27695 return std::make_pair(0U, &X86::GR16_ABCDRegClass);
27696 if (VT == MVT::i8 || VT == MVT::i1)
27697 return std::make_pair(0U, &X86::GR8_ABCD_LRegClass);
27698 if (VT == MVT::i64)
27699 return std::make_pair(0U, &X86::GR64_ABCDRegClass);
27701 case 'r': // GENERAL_REGS
27702 case 'l': // INDEX_REGS
27703 if (VT == MVT::i8 || VT == MVT::i1)
27704 return std::make_pair(0U, &X86::GR8RegClass);
27705 if (VT == MVT::i16)
27706 return std::make_pair(0U, &X86::GR16RegClass);
27707 if (VT == MVT::i32 || VT == MVT::f32 || !Subtarget->is64Bit())
27708 return std::make_pair(0U, &X86::GR32RegClass);
27709 return std::make_pair(0U, &X86::GR64RegClass);
27710 case 'R': // LEGACY_REGS
27711 if (VT == MVT::i8 || VT == MVT::i1)
27712 return std::make_pair(0U, &X86::GR8_NOREXRegClass);
27713 if (VT == MVT::i16)
27714 return std::make_pair(0U, &X86::GR16_NOREXRegClass);
27715 if (VT == MVT::i32 || !Subtarget->is64Bit())
27716 return std::make_pair(0U, &X86::GR32_NOREXRegClass);
27717 return std::make_pair(0U, &X86::GR64_NOREXRegClass);
27718 case 'f': // FP Stack registers.
27719 // If SSE is enabled for this VT, use f80 to ensure the isel moves the
27720 // value to the correct fpstack register class.
27721 if (VT == MVT::f32 && !isScalarFPTypeInSSEReg(VT))
27722 return std::make_pair(0U, &X86::RFP32RegClass);
27723 if (VT == MVT::f64 && !isScalarFPTypeInSSEReg(VT))
27724 return std::make_pair(0U, &X86::RFP64RegClass);
27725 return std::make_pair(0U, &X86::RFP80RegClass);
27726 case 'y': // MMX_REGS if MMX allowed.
27727 if (!Subtarget->hasMMX()) break;
27728 return std::make_pair(0U, &X86::VR64RegClass);
27729 case 'Y': // SSE_REGS if SSE2 allowed
27730 if (!Subtarget->hasSSE2()) break;
27732 case 'x': // SSE_REGS if SSE1 allowed or AVX_REGS if AVX allowed
27733 if (!Subtarget->hasSSE1()) break;
27735 switch (VT.SimpleTy) {
27737 // Scalar SSE types.
27740 return std::make_pair(0U, &X86::FR32RegClass);
27743 return std::make_pair(0U, &X86::FR64RegClass);
27751 return std::make_pair(0U, &X86::VR128RegClass);
27759 return std::make_pair(0U, &X86::VR256RegClass);
27764 return std::make_pair(0U, &X86::VR512RegClass);
27770 // Use the default implementation in TargetLowering to convert the register
27771 // constraint into a member of a register class.
27772 std::pair<unsigned, const TargetRegisterClass*> Res;
27773 Res = TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
27775 // Not found as a standard register?
27777 // Map st(0) -> st(7) -> ST0
27778 if (Constraint.size() == 7 && Constraint[0] == '{' &&
27779 tolower(Constraint[1]) == 's' &&
27780 tolower(Constraint[2]) == 't' &&
27781 Constraint[3] == '(' &&
27782 (Constraint[4] >= '0' && Constraint[4] <= '7') &&
27783 Constraint[5] == ')' &&
27784 Constraint[6] == '}') {
27786 Res.first = X86::FP0+Constraint[4]-'0';
27787 Res.second = &X86::RFP80RegClass;
27791 // GCC allows "st(0)" to be called just plain "st".
27792 if (StringRef("{st}").equals_lower(Constraint)) {
27793 Res.first = X86::FP0;
27794 Res.second = &X86::RFP80RegClass;
27799 if (StringRef("{flags}").equals_lower(Constraint)) {
27800 Res.first = X86::EFLAGS;
27801 Res.second = &X86::CCRRegClass;
27805 // 'A' means EAX + EDX.
27806 if (Constraint == "A") {
27807 Res.first = X86::EAX;
27808 Res.second = &X86::GR32_ADRegClass;
27814 // Otherwise, check to see if this is a register class of the wrong value
27815 // type. For example, we want to map "{ax},i32" -> {eax}, we don't want it to
27816 // turn into {ax},{dx}.
27817 // MVT::Other is used to specify clobber names.
27818 if (Res.second->hasType(VT) || VT == MVT::Other)
27819 return Res; // Correct type already, nothing to do.
27821 // Get a matching integer of the correct size. i.e. "ax" with MVT::32 should
27822 // return "eax". This should even work for things like getting 64bit integer
27823 // registers when given an f64 type.
27824 const TargetRegisterClass *Class = Res.second;
27825 if (Class == &X86::GR8RegClass || Class == &X86::GR16RegClass ||
27826 Class == &X86::GR32RegClass || Class == &X86::GR64RegClass) {
27827 unsigned Size = VT.getSizeInBits();
27828 MVT::SimpleValueType SimpleTy = Size == 1 || Size == 8 ? MVT::i8
27829 : Size == 16 ? MVT::i16
27830 : Size == 32 ? MVT::i32
27831 : Size == 64 ? MVT::i64
27833 unsigned DestReg = getX86SubSuperRegisterOrZero(Res.first, SimpleTy);
27835 Res.first = DestReg;
27836 Res.second = SimpleTy == MVT::i8 ? &X86::GR8RegClass
27837 : SimpleTy == MVT::i16 ? &X86::GR16RegClass
27838 : SimpleTy == MVT::i32 ? &X86::GR32RegClass
27839 : &X86::GR64RegClass;
27840 assert(Res.second->contains(Res.first) && "Register in register class");
27842 // No register found/type mismatch.
27844 Res.second = nullptr;
27846 } else if (Class == &X86::FR32RegClass || Class == &X86::FR64RegClass ||
27847 Class == &X86::VR128RegClass || Class == &X86::VR256RegClass ||
27848 Class == &X86::FR32XRegClass || Class == &X86::FR64XRegClass ||
27849 Class == &X86::VR128XRegClass || Class == &X86::VR256XRegClass ||
27850 Class == &X86::VR512RegClass) {
27851 // Handle references to XMM physical registers that got mapped into the
27852 // wrong class. This can happen with constraints like {xmm0} where the
27853 // target independent register mapper will just pick the first match it can
27854 // find, ignoring the required type.
27856 if (VT == MVT::f32 || VT == MVT::i32)
27857 Res.second = &X86::FR32RegClass;
27858 else if (VT == MVT::f64 || VT == MVT::i64)
27859 Res.second = &X86::FR64RegClass;
27860 else if (X86::VR128RegClass.hasType(VT))
27861 Res.second = &X86::VR128RegClass;
27862 else if (X86::VR256RegClass.hasType(VT))
27863 Res.second = &X86::VR256RegClass;
27864 else if (X86::VR512RegClass.hasType(VT))
27865 Res.second = &X86::VR512RegClass;
27867 // Type mismatch and not a clobber: Return an error;
27869 Res.second = nullptr;
27876 int X86TargetLowering::getScalingFactorCost(const DataLayout &DL,
27877 const AddrMode &AM, Type *Ty,
27878 unsigned AS) const {
27879 // Scaling factors are not free at all.
27880 // An indexed folded instruction, i.e., inst (reg1, reg2, scale),
27881 // will take 2 allocations in the out of order engine instead of 1
27882 // for plain addressing mode, i.e. inst (reg1).
27884 // vaddps (%rsi,%drx), %ymm0, %ymm1
27885 // Requires two allocations (one for the load, one for the computation)
27887 // vaddps (%rsi), %ymm0, %ymm1
27888 // Requires just 1 allocation, i.e., freeing allocations for other operations
27889 // and having less micro operations to execute.
27891 // For some X86 architectures, this is even worse because for instance for
27892 // stores, the complex addressing mode forces the instruction to use the
27893 // "load" ports instead of the dedicated "store" port.
27894 // E.g., on Haswell:
27895 // vmovaps %ymm1, (%r8, %rdi) can use port 2 or 3.
27896 // vmovaps %ymm1, (%r8) can use port 2, 3, or 7.
27897 if (isLegalAddressingMode(DL, AM, Ty, AS))
27898 // Scale represents reg2 * scale, thus account for 1
27899 // as soon as we use a second register.
27900 return AM.Scale != 0;
27904 bool X86TargetLowering::isIntDivCheap(EVT VT, AttributeSet Attr) const {
27905 // Integer division on x86 is expensive. However, when aggressively optimizing
27906 // for code size, we prefer to use a div instruction, as it is usually smaller
27907 // than the alternative sequence.
27908 // The exception to this is vector division. Since x86 doesn't have vector
27909 // integer division, leaving the division as-is is a loss even in terms of
27910 // size, because it will have to be scalarized, while the alternative code
27911 // sequence can be performed in vector form.
27912 bool OptSize = Attr.hasAttribute(AttributeSet::FunctionIndex,
27913 Attribute::MinSize);
27914 return OptSize && !VT.isVector();
27917 void X86TargetLowering::markInRegArguments(SelectionDAG &DAG,
27918 TargetLowering::ArgListTy& Args) const {
27919 // The MCU psABI requires some arguments to be passed in-register.
27920 // For regular calls, the inreg arguments are marked by the front-end.
27921 // However, for compiler generated library calls, we have to patch this
27923 if (!Subtarget->isTargetMCU() || !Args.size())
27926 unsigned FreeRegs = 3;
27927 for (auto &Arg : Args) {
27928 // For library functions, we do not expect any fancy types.
27929 unsigned Size = DAG.getDataLayout().getTypeSizeInBits(Arg.Ty);
27930 unsigned SizeInRegs = (Size + 31) / 32;
27931 if (SizeInRegs > 2 || SizeInRegs > FreeRegs)
27934 Arg.isInReg = true;
27935 FreeRegs -= SizeInRegs;