1 //===-- ARMISelLowering.cpp - ARM 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 ARM uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "arm-isel"
17 #include "ARMAddressingModes.h"
18 #include "ARMConstantPoolValue.h"
19 #include "ARMISelLowering.h"
20 #include "ARMMachineFunctionInfo.h"
21 #include "ARMPerfectShuffle.h"
22 #include "ARMRegisterInfo.h"
23 #include "ARMSubtarget.h"
24 #include "ARMTargetMachine.h"
25 #include "ARMTargetObjectFile.h"
26 #include "llvm/CallingConv.h"
27 #include "llvm/Constants.h"
28 #include "llvm/Function.h"
29 #include "llvm/GlobalValue.h"
30 #include "llvm/Instruction.h"
31 #include "llvm/Intrinsics.h"
32 #include "llvm/Type.h"
33 #include "llvm/CodeGen/CallingConvLower.h"
34 #include "llvm/CodeGen/MachineBasicBlock.h"
35 #include "llvm/CodeGen/MachineFrameInfo.h"
36 #include "llvm/CodeGen/MachineFunction.h"
37 #include "llvm/CodeGen/MachineInstrBuilder.h"
38 #include "llvm/CodeGen/MachineRegisterInfo.h"
39 #include "llvm/CodeGen/PseudoSourceValue.h"
40 #include "llvm/CodeGen/SelectionDAG.h"
41 #include "llvm/MC/MCSectionMachO.h"
42 #include "llvm/Target/TargetOptions.h"
43 #include "llvm/ADT/VectorExtras.h"
44 #include "llvm/ADT/Statistic.h"
45 #include "llvm/Support/CommandLine.h"
46 #include "llvm/Support/ErrorHandling.h"
47 #include "llvm/Support/MathExtras.h"
48 #include "llvm/Support/raw_ostream.h"
52 STATISTIC(NumTailCalls, "Number of tail calls");
54 // This option should go away when tail calls fully work.
56 EnableARMTailCalls("arm-tail-calls", cl::Hidden,
57 cl::desc("Generate tail calls (TEMPORARY OPTION)."),
61 EnableARMLongCalls("arm-long-calls", cl::Hidden,
62 cl::desc("Generate calls via indirect call instructions."),
65 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
66 CCValAssign::LocInfo &LocInfo,
67 ISD::ArgFlagsTy &ArgFlags,
69 static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
70 CCValAssign::LocInfo &LocInfo,
71 ISD::ArgFlagsTy &ArgFlags,
73 static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
74 CCValAssign::LocInfo &LocInfo,
75 ISD::ArgFlagsTy &ArgFlags,
77 static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
78 CCValAssign::LocInfo &LocInfo,
79 ISD::ArgFlagsTy &ArgFlags,
82 void ARMTargetLowering::addTypeForNEON(EVT VT, EVT PromotedLdStVT,
83 EVT PromotedBitwiseVT) {
84 if (VT != PromotedLdStVT) {
85 setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote);
86 AddPromotedToType (ISD::LOAD, VT.getSimpleVT(),
87 PromotedLdStVT.getSimpleVT());
89 setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote);
90 AddPromotedToType (ISD::STORE, VT.getSimpleVT(),
91 PromotedLdStVT.getSimpleVT());
94 EVT ElemTy = VT.getVectorElementType();
95 if (ElemTy != MVT::i64 && ElemTy != MVT::f64)
96 setOperationAction(ISD::VSETCC, VT.getSimpleVT(), Custom);
97 if (ElemTy == MVT::i8 || ElemTy == MVT::i16)
98 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT.getSimpleVT(), Custom);
99 if (ElemTy != MVT::i32) {
100 setOperationAction(ISD::SINT_TO_FP, VT.getSimpleVT(), Expand);
101 setOperationAction(ISD::UINT_TO_FP, VT.getSimpleVT(), Expand);
102 setOperationAction(ISD::FP_TO_SINT, VT.getSimpleVT(), Expand);
103 setOperationAction(ISD::FP_TO_UINT, VT.getSimpleVT(), Expand);
105 setOperationAction(ISD::BUILD_VECTOR, VT.getSimpleVT(), Custom);
106 setOperationAction(ISD::VECTOR_SHUFFLE, VT.getSimpleVT(), Custom);
107 if (llvm::ModelWithRegSequence())
108 setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Legal);
110 setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Custom);
111 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT.getSimpleVT(), Expand);
112 setOperationAction(ISD::SELECT, VT.getSimpleVT(), Expand);
113 setOperationAction(ISD::SELECT_CC, VT.getSimpleVT(), Expand);
114 if (VT.isInteger()) {
115 setOperationAction(ISD::SHL, VT.getSimpleVT(), Custom);
116 setOperationAction(ISD::SRA, VT.getSimpleVT(), Custom);
117 setOperationAction(ISD::SRL, VT.getSimpleVT(), Custom);
120 // Promote all bit-wise operations.
121 if (VT.isInteger() && VT != PromotedBitwiseVT) {
122 setOperationAction(ISD::AND, VT.getSimpleVT(), Promote);
123 AddPromotedToType (ISD::AND, VT.getSimpleVT(),
124 PromotedBitwiseVT.getSimpleVT());
125 setOperationAction(ISD::OR, VT.getSimpleVT(), Promote);
126 AddPromotedToType (ISD::OR, VT.getSimpleVT(),
127 PromotedBitwiseVT.getSimpleVT());
128 setOperationAction(ISD::XOR, VT.getSimpleVT(), Promote);
129 AddPromotedToType (ISD::XOR, VT.getSimpleVT(),
130 PromotedBitwiseVT.getSimpleVT());
133 // Neon does not support vector divide/remainder operations.
134 setOperationAction(ISD::SDIV, VT.getSimpleVT(), Expand);
135 setOperationAction(ISD::UDIV, VT.getSimpleVT(), Expand);
136 setOperationAction(ISD::FDIV, VT.getSimpleVT(), Expand);
137 setOperationAction(ISD::SREM, VT.getSimpleVT(), Expand);
138 setOperationAction(ISD::UREM, VT.getSimpleVT(), Expand);
139 setOperationAction(ISD::FREM, VT.getSimpleVT(), Expand);
142 void ARMTargetLowering::addDRTypeForNEON(EVT VT) {
143 addRegisterClass(VT, ARM::DPRRegisterClass);
144 addTypeForNEON(VT, MVT::f64, MVT::v2i32);
147 void ARMTargetLowering::addQRTypeForNEON(EVT VT) {
148 addRegisterClass(VT, ARM::QPRRegisterClass);
149 addTypeForNEON(VT, MVT::v2f64, MVT::v4i32);
152 static TargetLoweringObjectFile *createTLOF(TargetMachine &TM) {
153 if (TM.getSubtarget<ARMSubtarget>().isTargetDarwin())
154 return new TargetLoweringObjectFileMachO();
156 return new ARMElfTargetObjectFile();
159 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
160 : TargetLowering(TM, createTLOF(TM)) {
161 Subtarget = &TM.getSubtarget<ARMSubtarget>();
163 if (Subtarget->isTargetDarwin()) {
164 // Uses VFP for Thumb libfuncs if available.
165 if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
166 // Single-precision floating-point arithmetic.
167 setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
168 setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
169 setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
170 setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
172 // Double-precision floating-point arithmetic.
173 setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
174 setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
175 setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
176 setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
178 // Single-precision comparisons.
179 setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
180 setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
181 setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
182 setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
183 setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
184 setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
185 setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
186 setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
188 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
189 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
190 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
191 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
192 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
193 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
194 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
195 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
197 // Double-precision comparisons.
198 setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
199 setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
200 setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
201 setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
202 setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
203 setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
204 setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
205 setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
207 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
208 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
209 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
210 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
211 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
212 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
213 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
214 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
216 // Floating-point to integer conversions.
217 // i64 conversions are done via library routines even when generating VFP
218 // instructions, so use the same ones.
219 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
220 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
221 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
222 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
224 // Conversions between floating types.
225 setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
226 setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
228 // Integer to floating-point conversions.
229 // i64 conversions are done via library routines even when generating VFP
230 // instructions, so use the same ones.
231 // FIXME: There appears to be some naming inconsistency in ARM libgcc:
232 // e.g., __floatunsidf vs. __floatunssidfvfp.
233 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
234 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
235 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
236 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
240 // These libcalls are not available in 32-bit.
241 setLibcallName(RTLIB::SHL_I128, 0);
242 setLibcallName(RTLIB::SRL_I128, 0);
243 setLibcallName(RTLIB::SRA_I128, 0);
245 // Libcalls should use the AAPCS base standard ABI, even if hard float
246 // is in effect, as per the ARM RTABI specification, section 4.1.2.
247 if (Subtarget->isAAPCS_ABI()) {
248 for (int i = 0; i < RTLIB::UNKNOWN_LIBCALL; ++i) {
249 setLibcallCallingConv(static_cast<RTLIB::Libcall>(i),
250 CallingConv::ARM_AAPCS);
254 if (Subtarget->isThumb1Only())
255 addRegisterClass(MVT::i32, ARM::tGPRRegisterClass);
257 addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
258 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
259 addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
260 addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
262 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
265 if (Subtarget->hasNEON()) {
266 addDRTypeForNEON(MVT::v2f32);
267 addDRTypeForNEON(MVT::v8i8);
268 addDRTypeForNEON(MVT::v4i16);
269 addDRTypeForNEON(MVT::v2i32);
270 addDRTypeForNEON(MVT::v1i64);
272 addQRTypeForNEON(MVT::v4f32);
273 addQRTypeForNEON(MVT::v2f64);
274 addQRTypeForNEON(MVT::v16i8);
275 addQRTypeForNEON(MVT::v8i16);
276 addQRTypeForNEON(MVT::v4i32);
277 addQRTypeForNEON(MVT::v2i64);
279 // v2f64 is legal so that QR subregs can be extracted as f64 elements, but
280 // neither Neon nor VFP support any arithmetic operations on it.
281 setOperationAction(ISD::FADD, MVT::v2f64, Expand);
282 setOperationAction(ISD::FSUB, MVT::v2f64, Expand);
283 setOperationAction(ISD::FMUL, MVT::v2f64, Expand);
284 setOperationAction(ISD::FDIV, MVT::v2f64, Expand);
285 setOperationAction(ISD::FREM, MVT::v2f64, Expand);
286 setOperationAction(ISD::FCOPYSIGN, MVT::v2f64, Expand);
287 setOperationAction(ISD::VSETCC, MVT::v2f64, Expand);
288 setOperationAction(ISD::FNEG, MVT::v2f64, Expand);
289 setOperationAction(ISD::FABS, MVT::v2f64, Expand);
290 setOperationAction(ISD::FSQRT, MVT::v2f64, Expand);
291 setOperationAction(ISD::FSIN, MVT::v2f64, Expand);
292 setOperationAction(ISD::FCOS, MVT::v2f64, Expand);
293 setOperationAction(ISD::FPOWI, MVT::v2f64, Expand);
294 setOperationAction(ISD::FPOW, MVT::v2f64, Expand);
295 setOperationAction(ISD::FLOG, MVT::v2f64, Expand);
296 setOperationAction(ISD::FLOG2, MVT::v2f64, Expand);
297 setOperationAction(ISD::FLOG10, MVT::v2f64, Expand);
298 setOperationAction(ISD::FEXP, MVT::v2f64, Expand);
299 setOperationAction(ISD::FEXP2, MVT::v2f64, Expand);
300 setOperationAction(ISD::FCEIL, MVT::v2f64, Expand);
301 setOperationAction(ISD::FTRUNC, MVT::v2f64, Expand);
302 setOperationAction(ISD::FRINT, MVT::v2f64, Expand);
303 setOperationAction(ISD::FNEARBYINT, MVT::v2f64, Expand);
304 setOperationAction(ISD::FFLOOR, MVT::v2f64, Expand);
306 // Neon does not support some operations on v1i64 and v2i64 types.
307 setOperationAction(ISD::MUL, MVT::v1i64, Expand);
308 setOperationAction(ISD::MUL, MVT::v2i64, Expand);
309 setOperationAction(ISD::VSETCC, MVT::v1i64, Expand);
310 setOperationAction(ISD::VSETCC, MVT::v2i64, Expand);
312 setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
313 setTargetDAGCombine(ISD::SHL);
314 setTargetDAGCombine(ISD::SRL);
315 setTargetDAGCombine(ISD::SRA);
316 setTargetDAGCombine(ISD::SIGN_EXTEND);
317 setTargetDAGCombine(ISD::ZERO_EXTEND);
318 setTargetDAGCombine(ISD::ANY_EXTEND);
319 setTargetDAGCombine(ISD::SELECT_CC);
322 computeRegisterProperties();
324 // ARM does not have f32 extending load.
325 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
327 // ARM does not have i1 sign extending load.
328 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
330 // ARM supports all 4 flavors of integer indexed load / store.
331 if (!Subtarget->isThumb1Only()) {
332 for (unsigned im = (unsigned)ISD::PRE_INC;
333 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
334 setIndexedLoadAction(im, MVT::i1, Legal);
335 setIndexedLoadAction(im, MVT::i8, Legal);
336 setIndexedLoadAction(im, MVT::i16, Legal);
337 setIndexedLoadAction(im, MVT::i32, Legal);
338 setIndexedStoreAction(im, MVT::i1, Legal);
339 setIndexedStoreAction(im, MVT::i8, Legal);
340 setIndexedStoreAction(im, MVT::i16, Legal);
341 setIndexedStoreAction(im, MVT::i32, Legal);
345 // i64 operation support.
346 if (Subtarget->isThumb1Only()) {
347 setOperationAction(ISD::MUL, MVT::i64, Expand);
348 setOperationAction(ISD::MULHU, MVT::i32, Expand);
349 setOperationAction(ISD::MULHS, MVT::i32, Expand);
350 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
351 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
353 setOperationAction(ISD::MUL, MVT::i64, Expand);
354 setOperationAction(ISD::MULHU, MVT::i32, Expand);
355 if (!Subtarget->hasV6Ops())
356 setOperationAction(ISD::MULHS, MVT::i32, Expand);
358 setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
359 setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
360 setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
361 setOperationAction(ISD::SRL, MVT::i64, Custom);
362 setOperationAction(ISD::SRA, MVT::i64, Custom);
364 // ARM does not have ROTL.
365 setOperationAction(ISD::ROTL, MVT::i32, Expand);
366 setOperationAction(ISD::CTTZ, MVT::i32, Custom);
367 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
368 if (!Subtarget->hasV5TOps() || Subtarget->isThumb1Only())
369 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
371 // Only ARMv6 has BSWAP.
372 if (!Subtarget->hasV6Ops())
373 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
375 // These are expanded into libcalls.
376 if (!Subtarget->hasDivide()) {
377 // v7M has a hardware divider
378 setOperationAction(ISD::SDIV, MVT::i32, Expand);
379 setOperationAction(ISD::UDIV, MVT::i32, Expand);
381 setOperationAction(ISD::SREM, MVT::i32, Expand);
382 setOperationAction(ISD::UREM, MVT::i32, Expand);
383 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
384 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
386 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
387 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
388 setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
389 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
390 setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
392 setOperationAction(ISD::TRAP, MVT::Other, Legal);
394 // Use the default implementation.
395 setOperationAction(ISD::VASTART, MVT::Other, Custom);
396 setOperationAction(ISD::VAARG, MVT::Other, Expand);
397 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
398 setOperationAction(ISD::VAEND, MVT::Other, Expand);
399 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
400 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
401 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
402 // FIXME: Shouldn't need this, since no register is used, but the legalizer
403 // doesn't yet know how to not do that for SjLj.
404 setExceptionSelectorRegister(ARM::R0);
405 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
406 setOperationAction(ISD::MEMBARRIER, MVT::Other, Custom);
408 // If the subtarget does not have extract instructions, sign_extend_inreg
409 // needs to be expanded. Extract is available in ARM mode on v6 and up,
410 // and on most Thumb2 implementations.
411 if ((!Subtarget->isThumb() && !Subtarget->hasV6Ops())
412 || (Subtarget->isThumb2() && !Subtarget->hasT2ExtractPack())) {
413 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
414 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
416 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
418 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only())
419 // Turn f64->i64 into VMOVRRD, i64 -> f64 to VMOVDRR
420 // iff target supports vfp2.
421 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
423 // We want to custom lower some of our intrinsics.
424 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
426 setOperationAction(ISD::SETCC, MVT::i32, Expand);
427 setOperationAction(ISD::SETCC, MVT::f32, Expand);
428 setOperationAction(ISD::SETCC, MVT::f64, Expand);
429 setOperationAction(ISD::SELECT, MVT::i32, Expand);
430 setOperationAction(ISD::SELECT, MVT::f32, Expand);
431 setOperationAction(ISD::SELECT, MVT::f64, Expand);
432 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
433 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
434 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
436 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
437 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
438 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
439 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
440 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
442 // We don't support sin/cos/fmod/copysign/pow
443 setOperationAction(ISD::FSIN, MVT::f64, Expand);
444 setOperationAction(ISD::FSIN, MVT::f32, Expand);
445 setOperationAction(ISD::FCOS, MVT::f32, Expand);
446 setOperationAction(ISD::FCOS, MVT::f64, Expand);
447 setOperationAction(ISD::FREM, MVT::f64, Expand);
448 setOperationAction(ISD::FREM, MVT::f32, Expand);
449 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
450 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
451 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
453 setOperationAction(ISD::FPOW, MVT::f64, Expand);
454 setOperationAction(ISD::FPOW, MVT::f32, Expand);
456 // Various VFP goodness
457 if (!UseSoftFloat && !Subtarget->isThumb1Only()) {
458 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
459 if (Subtarget->hasVFP2()) {
460 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
461 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
462 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
463 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
465 // Special handling for half-precision FP.
466 if (!Subtarget->hasFP16()) {
467 setOperationAction(ISD::FP16_TO_FP32, MVT::f32, Expand);
468 setOperationAction(ISD::FP32_TO_FP16, MVT::i32, Expand);
472 // We have target-specific dag combine patterns for the following nodes:
473 // ARMISD::VMOVRRD - No need to call setTargetDAGCombine
474 setTargetDAGCombine(ISD::ADD);
475 setTargetDAGCombine(ISD::SUB);
476 setTargetDAGCombine(ISD::MUL);
478 setStackPointerRegisterToSaveRestore(ARM::SP);
480 if (UseSoftFloat || Subtarget->isThumb1Only() || !Subtarget->hasVFP2())
481 setSchedulingPreference(Sched::RegPressure);
483 setSchedulingPreference(Sched::Hybrid);
485 // FIXME: If-converter should use instruction latency to determine
486 // profitability rather than relying on fixed limits.
487 if (Subtarget->getCPUString() == "generic") {
488 // Generic (and overly aggressive) if-conversion limits.
489 setIfCvtBlockSizeLimit(10);
490 setIfCvtDupBlockSizeLimit(2);
491 } else if (Subtarget->hasV7Ops()) {
492 setIfCvtBlockSizeLimit(3);
493 setIfCvtDupBlockSizeLimit(1);
494 } else if (Subtarget->hasV6Ops()) {
495 setIfCvtBlockSizeLimit(2);
496 setIfCvtDupBlockSizeLimit(1);
498 setIfCvtBlockSizeLimit(3);
499 setIfCvtDupBlockSizeLimit(2);
502 maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type
503 // Do not enable CodePlacementOpt for now: it currently runs after the
504 // ARMConstantIslandPass and messes up branch relaxation and placement
505 // of constant islands.
506 // benefitFromCodePlacementOpt = true;
509 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
512 case ARMISD::Wrapper: return "ARMISD::Wrapper";
513 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
514 case ARMISD::CALL: return "ARMISD::CALL";
515 case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
516 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
517 case ARMISD::tCALL: return "ARMISD::tCALL";
518 case ARMISD::BRCOND: return "ARMISD::BRCOND";
519 case ARMISD::BR_JT: return "ARMISD::BR_JT";
520 case ARMISD::BR2_JT: return "ARMISD::BR2_JT";
521 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
522 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
523 case ARMISD::CMP: return "ARMISD::CMP";
524 case ARMISD::CMPZ: return "ARMISD::CMPZ";
525 case ARMISD::CMPFP: return "ARMISD::CMPFP";
526 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
527 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
528 case ARMISD::CMOV: return "ARMISD::CMOV";
529 case ARMISD::CNEG: return "ARMISD::CNEG";
531 case ARMISD::RBIT: return "ARMISD::RBIT";
533 case ARMISD::FTOSI: return "ARMISD::FTOSI";
534 case ARMISD::FTOUI: return "ARMISD::FTOUI";
535 case ARMISD::SITOF: return "ARMISD::SITOF";
536 case ARMISD::UITOF: return "ARMISD::UITOF";
538 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
539 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
540 case ARMISD::RRX: return "ARMISD::RRX";
542 case ARMISD::VMOVRRD: return "ARMISD::VMOVRRD";
543 case ARMISD::VMOVDRR: return "ARMISD::VMOVDRR";
545 case ARMISD::EH_SJLJ_SETJMP: return "ARMISD::EH_SJLJ_SETJMP";
546 case ARMISD::EH_SJLJ_LONGJMP:return "ARMISD::EH_SJLJ_LONGJMP";
548 case ARMISD::TC_RETURN: return "ARMISD::TC_RETURN";
550 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
552 case ARMISD::DYN_ALLOC: return "ARMISD::DYN_ALLOC";
554 case ARMISD::MEMBARRIER: return "ARMISD::MEMBARRIER";
555 case ARMISD::SYNCBARRIER: return "ARMISD::SYNCBARRIER";
557 case ARMISD::VCEQ: return "ARMISD::VCEQ";
558 case ARMISD::VCGE: return "ARMISD::VCGE";
559 case ARMISD::VCGEU: return "ARMISD::VCGEU";
560 case ARMISD::VCGT: return "ARMISD::VCGT";
561 case ARMISD::VCGTU: return "ARMISD::VCGTU";
562 case ARMISD::VTST: return "ARMISD::VTST";
564 case ARMISD::VSHL: return "ARMISD::VSHL";
565 case ARMISD::VSHRs: return "ARMISD::VSHRs";
566 case ARMISD::VSHRu: return "ARMISD::VSHRu";
567 case ARMISD::VSHLLs: return "ARMISD::VSHLLs";
568 case ARMISD::VSHLLu: return "ARMISD::VSHLLu";
569 case ARMISD::VSHLLi: return "ARMISD::VSHLLi";
570 case ARMISD::VSHRN: return "ARMISD::VSHRN";
571 case ARMISD::VRSHRs: return "ARMISD::VRSHRs";
572 case ARMISD::VRSHRu: return "ARMISD::VRSHRu";
573 case ARMISD::VRSHRN: return "ARMISD::VRSHRN";
574 case ARMISD::VQSHLs: return "ARMISD::VQSHLs";
575 case ARMISD::VQSHLu: return "ARMISD::VQSHLu";
576 case ARMISD::VQSHLsu: return "ARMISD::VQSHLsu";
577 case ARMISD::VQSHRNs: return "ARMISD::VQSHRNs";
578 case ARMISD::VQSHRNu: return "ARMISD::VQSHRNu";
579 case ARMISD::VQSHRNsu: return "ARMISD::VQSHRNsu";
580 case ARMISD::VQRSHRNs: return "ARMISD::VQRSHRNs";
581 case ARMISD::VQRSHRNu: return "ARMISD::VQRSHRNu";
582 case ARMISD::VQRSHRNsu: return "ARMISD::VQRSHRNsu";
583 case ARMISD::VGETLANEu: return "ARMISD::VGETLANEu";
584 case ARMISD::VGETLANEs: return "ARMISD::VGETLANEs";
585 case ARMISD::VDUP: return "ARMISD::VDUP";
586 case ARMISD::VDUPLANE: return "ARMISD::VDUPLANE";
587 case ARMISD::VEXT: return "ARMISD::VEXT";
588 case ARMISD::VREV64: return "ARMISD::VREV64";
589 case ARMISD::VREV32: return "ARMISD::VREV32";
590 case ARMISD::VREV16: return "ARMISD::VREV16";
591 case ARMISD::VZIP: return "ARMISD::VZIP";
592 case ARMISD::VUZP: return "ARMISD::VUZP";
593 case ARMISD::VTRN: return "ARMISD::VTRN";
594 case ARMISD::BUILD_VECTOR: return "ARMISD::BUILD_VECTOR";
595 case ARMISD::FMAX: return "ARMISD::FMAX";
596 case ARMISD::FMIN: return "ARMISD::FMIN";
600 /// getRegClassFor - Return the register class that should be used for the
601 /// specified value type.
602 TargetRegisterClass *ARMTargetLowering::getRegClassFor(EVT VT) const {
603 // Map v4i64 to QQ registers but do not make the type legal. Similarly map
604 // v8i64 to QQQQ registers. v4i64 and v8i64 are only used for REG_SEQUENCE to
605 // load / store 4 to 8 consecutive D registers.
606 if (Subtarget->hasNEON()) {
607 if (VT == MVT::v4i64)
608 return ARM::QQPRRegisterClass;
609 else if (VT == MVT::v8i64)
610 return ARM::QQQQPRRegisterClass;
612 return TargetLowering::getRegClassFor(VT);
615 /// getFunctionAlignment - Return the Log2 alignment of this function.
616 unsigned ARMTargetLowering::getFunctionAlignment(const Function *F) const {
617 return getTargetMachine().getSubtarget<ARMSubtarget>().isThumb() ? 0 : 1;
620 Sched::Preference ARMTargetLowering::getSchedulingPreference(SDNode *N) const {
621 unsigned NumVals = N->getNumValues();
623 return Sched::RegPressure;
625 for (unsigned i = 0; i != NumVals; ++i) {
626 EVT VT = N->getValueType(i);
627 if (VT.isFloatingPoint() || VT.isVector())
628 return Sched::Latency;
631 if (!N->isMachineOpcode())
632 return Sched::RegPressure;
634 // Load are scheduled for latency even if there instruction itinerary
636 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
637 const TargetInstrDesc &TID = TII->get(N->getMachineOpcode());
639 return Sched::Latency;
641 const InstrItineraryData &Itins = getTargetMachine().getInstrItineraryData();
642 if (!Itins.isEmpty() && Itins.getStageLatency(TID.getSchedClass()) > 2)
643 return Sched::Latency;
644 return Sched::RegPressure;
647 //===----------------------------------------------------------------------===//
649 //===----------------------------------------------------------------------===//
651 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
652 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
654 default: llvm_unreachable("Unknown condition code!");
655 case ISD::SETNE: return ARMCC::NE;
656 case ISD::SETEQ: return ARMCC::EQ;
657 case ISD::SETGT: return ARMCC::GT;
658 case ISD::SETGE: return ARMCC::GE;
659 case ISD::SETLT: return ARMCC::LT;
660 case ISD::SETLE: return ARMCC::LE;
661 case ISD::SETUGT: return ARMCC::HI;
662 case ISD::SETUGE: return ARMCC::HS;
663 case ISD::SETULT: return ARMCC::LO;
664 case ISD::SETULE: return ARMCC::LS;
668 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC.
669 static void FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
670 ARMCC::CondCodes &CondCode2) {
671 CondCode2 = ARMCC::AL;
673 default: llvm_unreachable("Unknown FP condition!");
675 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
677 case ISD::SETOGT: CondCode = ARMCC::GT; break;
679 case ISD::SETOGE: CondCode = ARMCC::GE; break;
680 case ISD::SETOLT: CondCode = ARMCC::MI; break;
681 case ISD::SETOLE: CondCode = ARMCC::LS; break;
682 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
683 case ISD::SETO: CondCode = ARMCC::VC; break;
684 case ISD::SETUO: CondCode = ARMCC::VS; break;
685 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
686 case ISD::SETUGT: CondCode = ARMCC::HI; break;
687 case ISD::SETUGE: CondCode = ARMCC::PL; break;
689 case ISD::SETULT: CondCode = ARMCC::LT; break;
691 case ISD::SETULE: CondCode = ARMCC::LE; break;
693 case ISD::SETUNE: CondCode = ARMCC::NE; break;
697 //===----------------------------------------------------------------------===//
698 // Calling Convention Implementation
699 //===----------------------------------------------------------------------===//
701 #include "ARMGenCallingConv.inc"
703 // APCS f64 is in register pairs, possibly split to stack
704 static bool f64AssignAPCS(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
705 CCValAssign::LocInfo &LocInfo,
706 CCState &State, bool CanFail) {
707 static const unsigned RegList[] = { ARM::R0, ARM::R1, ARM::R2, ARM::R3 };
709 // Try to get the first register.
710 if (unsigned Reg = State.AllocateReg(RegList, 4))
711 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
713 // For the 2nd half of a v2f64, do not fail.
717 // Put the whole thing on the stack.
718 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
719 State.AllocateStack(8, 4),
724 // Try to get the second register.
725 if (unsigned Reg = State.AllocateReg(RegList, 4))
726 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
728 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
729 State.AllocateStack(4, 4),
734 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
735 CCValAssign::LocInfo &LocInfo,
736 ISD::ArgFlagsTy &ArgFlags,
738 if (!f64AssignAPCS(ValNo, ValVT, LocVT, LocInfo, State, true))
740 if (LocVT == MVT::v2f64 &&
741 !f64AssignAPCS(ValNo, ValVT, LocVT, LocInfo, State, false))
743 return true; // we handled it
746 // AAPCS f64 is in aligned register pairs
747 static bool f64AssignAAPCS(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
748 CCValAssign::LocInfo &LocInfo,
749 CCState &State, bool CanFail) {
750 static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
751 static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
753 unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2);
755 // For the 2nd half of a v2f64, do not just fail.
759 // Put the whole thing on the stack.
760 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
761 State.AllocateStack(8, 8),
767 for (i = 0; i < 2; ++i)
768 if (HiRegList[i] == Reg)
771 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
772 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
777 static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
778 CCValAssign::LocInfo &LocInfo,
779 ISD::ArgFlagsTy &ArgFlags,
781 if (!f64AssignAAPCS(ValNo, ValVT, LocVT, LocInfo, State, true))
783 if (LocVT == MVT::v2f64 &&
784 !f64AssignAAPCS(ValNo, ValVT, LocVT, LocInfo, State, false))
786 return true; // we handled it
789 static bool f64RetAssign(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
790 CCValAssign::LocInfo &LocInfo, CCState &State) {
791 static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
792 static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
794 unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2);
796 return false; // we didn't handle it
799 for (i = 0; i < 2; ++i)
800 if (HiRegList[i] == Reg)
803 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
804 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
809 static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
810 CCValAssign::LocInfo &LocInfo,
811 ISD::ArgFlagsTy &ArgFlags,
813 if (!f64RetAssign(ValNo, ValVT, LocVT, LocInfo, State))
815 if (LocVT == MVT::v2f64 && !f64RetAssign(ValNo, ValVT, LocVT, LocInfo, State))
817 return true; // we handled it
820 static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
821 CCValAssign::LocInfo &LocInfo,
822 ISD::ArgFlagsTy &ArgFlags,
824 return RetCC_ARM_APCS_Custom_f64(ValNo, ValVT, LocVT, LocInfo, ArgFlags,
828 /// CCAssignFnForNode - Selects the correct CCAssignFn for a the
829 /// given CallingConvention value.
830 CCAssignFn *ARMTargetLowering::CCAssignFnForNode(CallingConv::ID CC,
832 bool isVarArg) const {
835 llvm_unreachable("Unsupported calling convention");
837 case CallingConv::Fast:
838 // Use target triple & subtarget features to do actual dispatch.
839 if (Subtarget->isAAPCS_ABI()) {
840 if (Subtarget->hasVFP2() &&
841 FloatABIType == FloatABI::Hard && !isVarArg)
842 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
844 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
846 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
847 case CallingConv::ARM_AAPCS_VFP:
848 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
849 case CallingConv::ARM_AAPCS:
850 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
851 case CallingConv::ARM_APCS:
852 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
856 /// LowerCallResult - Lower the result values of a call into the
857 /// appropriate copies out of appropriate physical registers.
859 ARMTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
860 CallingConv::ID CallConv, bool isVarArg,
861 const SmallVectorImpl<ISD::InputArg> &Ins,
862 DebugLoc dl, SelectionDAG &DAG,
863 SmallVectorImpl<SDValue> &InVals) const {
865 // Assign locations to each value returned by this call.
866 SmallVector<CCValAssign, 16> RVLocs;
867 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
868 RVLocs, *DAG.getContext());
869 CCInfo.AnalyzeCallResult(Ins,
870 CCAssignFnForNode(CallConv, /* Return*/ true,
873 // Copy all of the result registers out of their specified physreg.
874 for (unsigned i = 0; i != RVLocs.size(); ++i) {
875 CCValAssign VA = RVLocs[i];
878 if (VA.needsCustom()) {
879 // Handle f64 or half of a v2f64.
880 SDValue Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
882 Chain = Lo.getValue(1);
883 InFlag = Lo.getValue(2);
884 VA = RVLocs[++i]; // skip ahead to next loc
885 SDValue Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
887 Chain = Hi.getValue(1);
888 InFlag = Hi.getValue(2);
889 Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
891 if (VA.getLocVT() == MVT::v2f64) {
892 SDValue Vec = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
893 Vec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val,
894 DAG.getConstant(0, MVT::i32));
896 VA = RVLocs[++i]; // skip ahead to next loc
897 Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag);
898 Chain = Lo.getValue(1);
899 InFlag = Lo.getValue(2);
900 VA = RVLocs[++i]; // skip ahead to next loc
901 Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag);
902 Chain = Hi.getValue(1);
903 InFlag = Hi.getValue(2);
904 Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
905 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val,
906 DAG.getConstant(1, MVT::i32));
909 Val = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), VA.getLocVT(),
911 Chain = Val.getValue(1);
912 InFlag = Val.getValue(2);
915 switch (VA.getLocInfo()) {
916 default: llvm_unreachable("Unknown loc info!");
917 case CCValAssign::Full: break;
918 case CCValAssign::BCvt:
919 Val = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), Val);
923 InVals.push_back(Val);
929 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
930 /// by "Src" to address "Dst" of size "Size". Alignment information is
931 /// specified by the specific parameter attribute. The copy will be passed as
932 /// a byval function parameter.
933 /// Sometimes what we are copying is the end of a larger object, the part that
934 /// does not fit in registers.
936 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
937 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
939 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
940 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
941 /*isVolatile=*/false, /*AlwaysInline=*/false,
945 /// LowerMemOpCallTo - Store the argument to the stack.
947 ARMTargetLowering::LowerMemOpCallTo(SDValue Chain,
948 SDValue StackPtr, SDValue Arg,
949 DebugLoc dl, SelectionDAG &DAG,
950 const CCValAssign &VA,
951 ISD::ArgFlagsTy Flags) const {
952 unsigned LocMemOffset = VA.getLocMemOffset();
953 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
954 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
955 if (Flags.isByVal()) {
956 return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG, dl);
958 return DAG.getStore(Chain, dl, Arg, PtrOff,
959 PseudoSourceValue::getStack(), LocMemOffset,
963 void ARMTargetLowering::PassF64ArgInRegs(DebugLoc dl, SelectionDAG &DAG,
964 SDValue Chain, SDValue &Arg,
965 RegsToPassVector &RegsToPass,
966 CCValAssign &VA, CCValAssign &NextVA,
968 SmallVector<SDValue, 8> &MemOpChains,
969 ISD::ArgFlagsTy Flags) const {
971 SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl,
972 DAG.getVTList(MVT::i32, MVT::i32), Arg);
973 RegsToPass.push_back(std::make_pair(VA.getLocReg(), fmrrd));
975 if (NextVA.isRegLoc())
976 RegsToPass.push_back(std::make_pair(NextVA.getLocReg(), fmrrd.getValue(1)));
978 assert(NextVA.isMemLoc());
979 if (StackPtr.getNode() == 0)
980 StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
982 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, fmrrd.getValue(1),
988 /// LowerCall - Lowering a call into a callseq_start <-
989 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
992 ARMTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
993 CallingConv::ID CallConv, bool isVarArg,
995 const SmallVectorImpl<ISD::OutputArg> &Outs,
996 const SmallVectorImpl<ISD::InputArg> &Ins,
997 DebugLoc dl, SelectionDAG &DAG,
998 SmallVectorImpl<SDValue> &InVals) const {
999 MachineFunction &MF = DAG.getMachineFunction();
1000 bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
1001 bool IsSibCall = false;
1002 // Temporarily disable tail calls so things don't break.
1003 if (!EnableARMTailCalls)
1006 // Check if it's really possible to do a tail call.
1007 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
1008 isVarArg, IsStructRet, MF.getFunction()->hasStructRetAttr(),
1010 // We don't support GuaranteedTailCallOpt for ARM, only automatically
1011 // detected sibcalls.
1018 // Analyze operands of the call, assigning locations to each operand.
1019 SmallVector<CCValAssign, 16> ArgLocs;
1020 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
1022 CCInfo.AnalyzeCallOperands(Outs,
1023 CCAssignFnForNode(CallConv, /* Return*/ false,
1026 // Get a count of how many bytes are to be pushed on the stack.
1027 unsigned NumBytes = CCInfo.getNextStackOffset();
1029 // For tail calls, memory operands are available in our caller's stack.
1033 // Adjust the stack pointer for the new arguments...
1034 // These operations are automatically eliminated by the prolog/epilog pass
1036 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
1038 SDValue StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
1040 RegsToPassVector RegsToPass;
1041 SmallVector<SDValue, 8> MemOpChains;
1043 // Walk the register/memloc assignments, inserting copies/loads. In the case
1044 // of tail call optimization, arguments are handled later.
1045 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size();
1047 ++i, ++realArgIdx) {
1048 CCValAssign &VA = ArgLocs[i];
1049 SDValue Arg = Outs[realArgIdx].Val;
1050 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
1052 // Promote the value if needed.
1053 switch (VA.getLocInfo()) {
1054 default: llvm_unreachable("Unknown loc info!");
1055 case CCValAssign::Full: break;
1056 case CCValAssign::SExt:
1057 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
1059 case CCValAssign::ZExt:
1060 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
1062 case CCValAssign::AExt:
1063 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
1065 case CCValAssign::BCvt:
1066 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
1070 // f64 and v2f64 might be passed in i32 pairs and must be split into pieces
1071 if (VA.needsCustom()) {
1072 if (VA.getLocVT() == MVT::v2f64) {
1073 SDValue Op0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1074 DAG.getConstant(0, MVT::i32));
1075 SDValue Op1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1076 DAG.getConstant(1, MVT::i32));
1078 PassF64ArgInRegs(dl, DAG, Chain, Op0, RegsToPass,
1079 VA, ArgLocs[++i], StackPtr, MemOpChains, Flags);
1081 VA = ArgLocs[++i]; // skip ahead to next loc
1082 if (VA.isRegLoc()) {
1083 PassF64ArgInRegs(dl, DAG, Chain, Op1, RegsToPass,
1084 VA, ArgLocs[++i], StackPtr, MemOpChains, Flags);
1086 assert(VA.isMemLoc());
1088 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Op1,
1089 dl, DAG, VA, Flags));
1092 PassF64ArgInRegs(dl, DAG, Chain, Arg, RegsToPass, VA, ArgLocs[++i],
1093 StackPtr, MemOpChains, Flags);
1095 } else if (VA.isRegLoc()) {
1096 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
1098 assert(VA.isMemLoc());
1100 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Arg,
1101 dl, DAG, VA, Flags));
1105 if (!MemOpChains.empty())
1106 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1107 &MemOpChains[0], MemOpChains.size());
1109 // Build a sequence of copy-to-reg nodes chained together with token chain
1110 // and flag operands which copy the outgoing args into the appropriate regs.
1112 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1113 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
1114 RegsToPass[i].second, InFlag);
1115 InFlag = Chain.getValue(1);
1118 // For tail calls lower the arguments to the 'real' stack slot.
1120 // Force all the incoming stack arguments to be loaded from the stack
1121 // before any new outgoing arguments are stored to the stack, because the
1122 // outgoing stack slots may alias the incoming argument stack slots, and
1123 // the alias isn't otherwise explicit. This is slightly more conservative
1124 // than necessary, because it means that each store effectively depends
1125 // on every argument instead of just those arguments it would clobber.
1127 // Do not flag preceeding copytoreg stuff together with the following stuff.
1129 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1130 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
1131 RegsToPass[i].second, InFlag);
1132 InFlag = Chain.getValue(1);
1137 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
1138 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
1139 // node so that legalize doesn't hack it.
1140 bool isDirect = false;
1141 bool isARMFunc = false;
1142 bool isLocalARMFunc = false;
1143 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1145 if (EnableARMLongCalls) {
1146 assert (getTargetMachine().getRelocationModel() == Reloc::Static
1147 && "long-calls with non-static relocation model!");
1148 // Handle a global address or an external symbol. If it's not one of
1149 // those, the target's already in a register, so we don't need to do
1151 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1152 const GlobalValue *GV = G->getGlobal();
1153 // Create a constant pool entry for the callee address
1154 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1155 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV,
1158 // Get the address of the callee into a register
1159 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1160 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1161 Callee = DAG.getLoad(getPointerTy(), dl,
1162 DAG.getEntryNode(), CPAddr,
1163 PseudoSourceValue::getConstantPool(), 0,
1165 } else if (ExternalSymbolSDNode *S=dyn_cast<ExternalSymbolSDNode>(Callee)) {
1166 const char *Sym = S->getSymbol();
1168 // Create a constant pool entry for the callee address
1169 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1170 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1171 Sym, ARMPCLabelIndex, 0);
1172 // Get the address of the callee into a register
1173 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1174 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1175 Callee = DAG.getLoad(getPointerTy(), dl,
1176 DAG.getEntryNode(), CPAddr,
1177 PseudoSourceValue::getConstantPool(), 0,
1180 } else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1181 const GlobalValue *GV = G->getGlobal();
1183 bool isExt = GV->isDeclaration() || GV->isWeakForLinker();
1184 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
1185 getTargetMachine().getRelocationModel() != Reloc::Static;
1186 isARMFunc = !Subtarget->isThumb() || isStub;
1187 // ARM call to a local ARM function is predicable.
1188 isLocalARMFunc = !Subtarget->isThumb() && !isExt;
1189 // tBX takes a register source operand.
1190 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1191 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1192 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV,
1195 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1196 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1197 Callee = DAG.getLoad(getPointerTy(), dl,
1198 DAG.getEntryNode(), CPAddr,
1199 PseudoSourceValue::getConstantPool(), 0,
1201 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1202 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1203 getPointerTy(), Callee, PICLabel);
1205 Callee = DAG.getTargetGlobalAddress(GV, getPointerTy());
1206 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
1208 bool isStub = Subtarget->isTargetDarwin() &&
1209 getTargetMachine().getRelocationModel() != Reloc::Static;
1210 isARMFunc = !Subtarget->isThumb() || isStub;
1211 // tBX takes a register source operand.
1212 const char *Sym = S->getSymbol();
1213 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1214 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1215 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1216 Sym, ARMPCLabelIndex, 4);
1217 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1218 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1219 Callee = DAG.getLoad(getPointerTy(), dl,
1220 DAG.getEntryNode(), CPAddr,
1221 PseudoSourceValue::getConstantPool(), 0,
1223 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1224 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1225 getPointerTy(), Callee, PICLabel);
1227 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
1230 // FIXME: handle tail calls differently.
1232 if (Subtarget->isThumb()) {
1233 if ((!isDirect || isARMFunc) && !Subtarget->hasV5TOps())
1234 CallOpc = ARMISD::CALL_NOLINK;
1236 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
1238 CallOpc = (isDirect || Subtarget->hasV5TOps())
1239 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
1240 : ARMISD::CALL_NOLINK;
1242 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb1Only()) {
1243 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
1244 Chain = DAG.getCopyToReg(Chain, dl, ARM::LR, DAG.getUNDEF(MVT::i32),InFlag);
1245 InFlag = Chain.getValue(1);
1248 std::vector<SDValue> Ops;
1249 Ops.push_back(Chain);
1250 Ops.push_back(Callee);
1252 // Add argument registers to the end of the list so that they are known live
1254 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1255 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1256 RegsToPass[i].second.getValueType()));
1258 if (InFlag.getNode())
1259 Ops.push_back(InFlag);
1261 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
1263 return DAG.getNode(ARMISD::TC_RETURN, dl, NodeTys, &Ops[0], Ops.size());
1265 // Returns a chain and a flag for retval copy to use.
1266 Chain = DAG.getNode(CallOpc, dl, NodeTys, &Ops[0], Ops.size());
1267 InFlag = Chain.getValue(1);
1269 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
1270 DAG.getIntPtrConstant(0, true), InFlag);
1272 InFlag = Chain.getValue(1);
1274 // Handle result values, copying them out of physregs into vregs that we
1276 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins,
1280 /// MatchingStackOffset - Return true if the given stack call argument is
1281 /// already available in the same position (relatively) of the caller's
1282 /// incoming argument stack.
1284 bool MatchingStackOffset(SDValue Arg, unsigned Offset, ISD::ArgFlagsTy Flags,
1285 MachineFrameInfo *MFI, const MachineRegisterInfo *MRI,
1286 const ARMInstrInfo *TII) {
1287 unsigned Bytes = Arg.getValueType().getSizeInBits() / 8;
1289 if (Arg.getOpcode() == ISD::CopyFromReg) {
1290 unsigned VR = cast<RegisterSDNode>(Arg.getOperand(1))->getReg();
1291 if (!VR || TargetRegisterInfo::isPhysicalRegister(VR))
1293 MachineInstr *Def = MRI->getVRegDef(VR);
1296 if (!Flags.isByVal()) {
1297 if (!TII->isLoadFromStackSlot(Def, FI))
1300 // unsigned Opcode = Def->getOpcode();
1301 // if ((Opcode == X86::LEA32r || Opcode == X86::LEA64r) &&
1302 // Def->getOperand(1).isFI()) {
1303 // FI = Def->getOperand(1).getIndex();
1304 // Bytes = Flags.getByValSize();
1308 } else if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Arg)) {
1309 if (Flags.isByVal())
1310 // ByVal argument is passed in as a pointer but it's now being
1311 // dereferenced. e.g.
1312 // define @foo(%struct.X* %A) {
1313 // tail call @bar(%struct.X* byval %A)
1316 SDValue Ptr = Ld->getBasePtr();
1317 FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr);
1320 FI = FINode->getIndex();
1324 assert(FI != INT_MAX);
1325 if (!MFI->isFixedObjectIndex(FI))
1327 return Offset == MFI->getObjectOffset(FI) && Bytes == MFI->getObjectSize(FI);
1330 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
1331 /// for tail call optimization. Targets which want to do tail call
1332 /// optimization should implement this function.
1334 ARMTargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
1335 CallingConv::ID CalleeCC,
1337 bool isCalleeStructRet,
1338 bool isCallerStructRet,
1339 const SmallVectorImpl<ISD::OutputArg> &Outs,
1340 const SmallVectorImpl<ISD::InputArg> &Ins,
1341 SelectionDAG& DAG) const {
1343 const Function *CallerF = DAG.getMachineFunction().getFunction();
1344 CallingConv::ID CallerCC = CallerF->getCallingConv();
1345 bool CCMatch = CallerCC == CalleeCC;
1347 // Look for obvious safe cases to perform tail call optimization that do not
1348 // require ABI changes. This is what gcc calls sibcall.
1350 // Can't do sibcall if stack needs to be dynamically re-aligned. PEI needs to
1351 // emit a special epilogue.
1352 // Not sure yet if this is true on ARM.
1353 //?? if (RegInfo->needsStackRealignment(MF))
1356 // Do not sibcall optimize vararg calls unless the call site is not passing any
1358 if (isVarArg && !Outs.empty())
1361 // Also avoid sibcall optimization if either caller or callee uses struct
1362 // return semantics.
1363 if (isCalleeStructRet || isCallerStructRet)
1366 // If the calling conventions do not match, then we'd better make sure the
1367 // results are returned in the same way as what the caller expects.
1369 SmallVector<CCValAssign, 16> RVLocs1;
1370 CCState CCInfo1(CalleeCC, false, getTargetMachine(),
1371 RVLocs1, *DAG.getContext());
1372 CCInfo1.AnalyzeCallResult(Ins, CCAssignFnForNode(CalleeCC, true, isVarArg));
1374 SmallVector<CCValAssign, 16> RVLocs2;
1375 CCState CCInfo2(CallerCC, false, getTargetMachine(),
1376 RVLocs2, *DAG.getContext());
1377 CCInfo2.AnalyzeCallResult(Ins, CCAssignFnForNode(CallerCC, true, isVarArg));
1379 if (RVLocs1.size() != RVLocs2.size())
1381 for (unsigned i = 0, e = RVLocs1.size(); i != e; ++i) {
1382 if (RVLocs1[i].isRegLoc() != RVLocs2[i].isRegLoc())
1384 if (RVLocs1[i].getLocInfo() != RVLocs2[i].getLocInfo())
1386 if (RVLocs1[i].isRegLoc()) {
1387 if (RVLocs1[i].getLocReg() != RVLocs2[i].getLocReg())
1390 if (RVLocs1[i].getLocMemOffset() != RVLocs2[i].getLocMemOffset())
1396 // If the callee takes no arguments then go on to check the results of the
1398 if (!Outs.empty()) {
1399 // Check if stack adjustment is needed. For now, do not do this if any
1400 // argument is passed on the stack.
1401 SmallVector<CCValAssign, 16> ArgLocs;
1402 CCState CCInfo(CalleeCC, isVarArg, getTargetMachine(),
1403 ArgLocs, *DAG.getContext());
1404 CCInfo.AnalyzeCallOperands(Outs,
1405 CCAssignFnForNode(CalleeCC, false, isVarArg));
1406 if (CCInfo.getNextStackOffset()) {
1407 MachineFunction &MF = DAG.getMachineFunction();
1409 // Check if the arguments are already laid out in the right way as
1410 // the caller's fixed stack objects.
1411 MachineFrameInfo *MFI = MF.getFrameInfo();
1412 const MachineRegisterInfo *MRI = &MF.getRegInfo();
1413 const ARMInstrInfo *TII =
1414 ((ARMTargetMachine&)getTargetMachine()).getInstrInfo();
1415 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size();
1417 ++i, ++realArgIdx) {
1418 CCValAssign &VA = ArgLocs[i];
1419 EVT RegVT = VA.getLocVT();
1420 SDValue Arg = Outs[realArgIdx].Val;
1421 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
1422 if (VA.getLocInfo() == CCValAssign::Indirect)
1424 if (VA.needsCustom()) {
1425 // f64 and vector types are split into multiple registers or
1426 // register/stack-slot combinations. The types will not match
1427 // the registers; give up on memory f64 refs until we figure
1428 // out what to do about this.
1431 if (!ArgLocs[++i].isRegLoc())
1433 if (RegVT == MVT::v2f64) {
1434 if (!ArgLocs[++i].isRegLoc())
1436 if (!ArgLocs[++i].isRegLoc())
1439 } else if (!VA.isRegLoc()) {
1440 if (!MatchingStackOffset(Arg, VA.getLocMemOffset(), Flags,
1452 ARMTargetLowering::LowerReturn(SDValue Chain,
1453 CallingConv::ID CallConv, bool isVarArg,
1454 const SmallVectorImpl<ISD::OutputArg> &Outs,
1455 DebugLoc dl, SelectionDAG &DAG) const {
1457 // CCValAssign - represent the assignment of the return value to a location.
1458 SmallVector<CCValAssign, 16> RVLocs;
1460 // CCState - Info about the registers and stack slots.
1461 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
1464 // Analyze outgoing return values.
1465 CCInfo.AnalyzeReturn(Outs, CCAssignFnForNode(CallConv, /* Return */ true,
1468 // If this is the first return lowered for this function, add
1469 // the regs to the liveout set for the function.
1470 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
1471 for (unsigned i = 0; i != RVLocs.size(); ++i)
1472 if (RVLocs[i].isRegLoc())
1473 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
1478 // Copy the result values into the output registers.
1479 for (unsigned i = 0, realRVLocIdx = 0;
1481 ++i, ++realRVLocIdx) {
1482 CCValAssign &VA = RVLocs[i];
1483 assert(VA.isRegLoc() && "Can only return in registers!");
1485 SDValue Arg = Outs[realRVLocIdx].Val;
1487 switch (VA.getLocInfo()) {
1488 default: llvm_unreachable("Unknown loc info!");
1489 case CCValAssign::Full: break;
1490 case CCValAssign::BCvt:
1491 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
1495 if (VA.needsCustom()) {
1496 if (VA.getLocVT() == MVT::v2f64) {
1497 // Extract the first half and return it in two registers.
1498 SDValue Half = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1499 DAG.getConstant(0, MVT::i32));
1500 SDValue HalfGPRs = DAG.getNode(ARMISD::VMOVRRD, dl,
1501 DAG.getVTList(MVT::i32, MVT::i32), Half);
1503 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), HalfGPRs, Flag);
1504 Flag = Chain.getValue(1);
1505 VA = RVLocs[++i]; // skip ahead to next loc
1506 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1507 HalfGPRs.getValue(1), Flag);
1508 Flag = Chain.getValue(1);
1509 VA = RVLocs[++i]; // skip ahead to next loc
1511 // Extract the 2nd half and fall through to handle it as an f64 value.
1512 Arg = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1513 DAG.getConstant(1, MVT::i32));
1515 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
1517 SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl,
1518 DAG.getVTList(MVT::i32, MVT::i32), &Arg, 1);
1519 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd, Flag);
1520 Flag = Chain.getValue(1);
1521 VA = RVLocs[++i]; // skip ahead to next loc
1522 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd.getValue(1),
1525 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag);
1527 // Guarantee that all emitted copies are
1528 // stuck together, avoiding something bad.
1529 Flag = Chain.getValue(1);
1534 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
1536 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain);
1541 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
1542 // their target counterpart wrapped in the ARMISD::Wrapper node. Suppose N is
1543 // one of the above mentioned nodes. It has to be wrapped because otherwise
1544 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
1545 // be used to form addressing mode. These wrapped nodes will be selected
1547 static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
1548 EVT PtrVT = Op.getValueType();
1549 // FIXME there is no actual debug info here
1550 DebugLoc dl = Op.getDebugLoc();
1551 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
1553 if (CP->isMachineConstantPoolEntry())
1554 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
1555 CP->getAlignment());
1557 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
1558 CP->getAlignment());
1559 return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res);
1562 SDValue ARMTargetLowering::LowerBlockAddress(SDValue Op,
1563 SelectionDAG &DAG) const {
1564 MachineFunction &MF = DAG.getMachineFunction();
1565 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1566 unsigned ARMPCLabelIndex = 0;
1567 DebugLoc DL = Op.getDebugLoc();
1568 EVT PtrVT = getPointerTy();
1569 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
1570 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1572 if (RelocM == Reloc::Static) {
1573 CPAddr = DAG.getTargetConstantPool(BA, PtrVT, 4);
1575 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1576 ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1577 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(BA, ARMPCLabelIndex,
1578 ARMCP::CPBlockAddress,
1580 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1582 CPAddr = DAG.getNode(ARMISD::Wrapper, DL, PtrVT, CPAddr);
1583 SDValue Result = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), CPAddr,
1584 PseudoSourceValue::getConstantPool(), 0,
1586 if (RelocM == Reloc::Static)
1588 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1589 return DAG.getNode(ARMISD::PIC_ADD, DL, PtrVT, Result, PICLabel);
1592 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
1594 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
1595 SelectionDAG &DAG) const {
1596 DebugLoc dl = GA->getDebugLoc();
1597 EVT PtrVT = getPointerTy();
1598 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1599 MachineFunction &MF = DAG.getMachineFunction();
1600 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1601 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1602 ARMConstantPoolValue *CPV =
1603 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1604 ARMCP::CPValue, PCAdj, "tlsgd", true);
1605 SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1606 Argument = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Argument);
1607 Argument = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Argument,
1608 PseudoSourceValue::getConstantPool(), 0,
1610 SDValue Chain = Argument.getValue(1);
1612 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1613 Argument = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Argument, PICLabel);
1615 // call __tls_get_addr.
1618 Entry.Node = Argument;
1619 Entry.Ty = (const Type *) Type::getInt32Ty(*DAG.getContext());
1620 Args.push_back(Entry);
1621 // FIXME: is there useful debug info available here?
1622 std::pair<SDValue, SDValue> CallResult =
1623 LowerCallTo(Chain, (const Type *) Type::getInt32Ty(*DAG.getContext()),
1624 false, false, false, false,
1625 0, CallingConv::C, false, /*isReturnValueUsed=*/true,
1626 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG, dl);
1627 return CallResult.first;
1630 // Lower ISD::GlobalTLSAddress using the "initial exec" or
1631 // "local exec" model.
1633 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
1634 SelectionDAG &DAG) const {
1635 const GlobalValue *GV = GA->getGlobal();
1636 DebugLoc dl = GA->getDebugLoc();
1638 SDValue Chain = DAG.getEntryNode();
1639 EVT PtrVT = getPointerTy();
1640 // Get the Thread Pointer
1641 SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
1643 if (GV->isDeclaration()) {
1644 MachineFunction &MF = DAG.getMachineFunction();
1645 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1646 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1647 // Initial exec model.
1648 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1649 ARMConstantPoolValue *CPV =
1650 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1651 ARMCP::CPValue, PCAdj, "gottpoff", true);
1652 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1653 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
1654 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1655 PseudoSourceValue::getConstantPool(), 0,
1657 Chain = Offset.getValue(1);
1659 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1660 Offset = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Offset, PICLabel);
1662 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1663 PseudoSourceValue::getConstantPool(), 0,
1667 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, "tpoff");
1668 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1669 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
1670 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1671 PseudoSourceValue::getConstantPool(), 0,
1675 // The address of the thread local variable is the add of the thread
1676 // pointer with the offset of the variable.
1677 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
1681 ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
1682 // TODO: implement the "local dynamic" model
1683 assert(Subtarget->isTargetELF() &&
1684 "TLS not implemented for non-ELF targets");
1685 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
1686 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
1687 // otherwise use the "Local Exec" TLS Model
1688 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
1689 return LowerToTLSGeneralDynamicModel(GA, DAG);
1691 return LowerToTLSExecModels(GA, DAG);
1694 SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
1695 SelectionDAG &DAG) const {
1696 EVT PtrVT = getPointerTy();
1697 DebugLoc dl = Op.getDebugLoc();
1698 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1699 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1700 if (RelocM == Reloc::PIC_) {
1701 bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility();
1702 ARMConstantPoolValue *CPV =
1703 new ARMConstantPoolValue(GV, UseGOTOFF ? "GOTOFF" : "GOT");
1704 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1705 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1706 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
1708 PseudoSourceValue::getConstantPool(), 0,
1710 SDValue Chain = Result.getValue(1);
1711 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(PtrVT);
1712 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result, GOT);
1714 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
1715 PseudoSourceValue::getGOT(), 0,
1719 // If we have T2 ops, we can materialize the address directly via movt/movw
1720 // pair. This is always cheaper.
1721 if (Subtarget->useMovt()) {
1722 return DAG.getNode(ARMISD::Wrapper, dl, PtrVT,
1723 DAG.getTargetGlobalAddress(GV, PtrVT));
1725 SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1726 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1727 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1728 PseudoSourceValue::getConstantPool(), 0,
1734 SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
1735 SelectionDAG &DAG) const {
1736 MachineFunction &MF = DAG.getMachineFunction();
1737 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1738 unsigned ARMPCLabelIndex = 0;
1739 EVT PtrVT = getPointerTy();
1740 DebugLoc dl = Op.getDebugLoc();
1741 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1742 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1744 if (RelocM == Reloc::Static)
1745 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1747 ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1748 unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 : (Subtarget->isThumb()?4:8);
1749 ARMConstantPoolValue *CPV =
1750 new ARMConstantPoolValue(GV, ARMPCLabelIndex, ARMCP::CPValue, PCAdj);
1751 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1753 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1755 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1756 PseudoSourceValue::getConstantPool(), 0,
1758 SDValue Chain = Result.getValue(1);
1760 if (RelocM == Reloc::PIC_) {
1761 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1762 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1765 if (Subtarget->GVIsIndirectSymbol(GV, RelocM))
1766 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
1767 PseudoSourceValue::getGOT(), 0,
1773 SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
1774 SelectionDAG &DAG) const {
1775 assert(Subtarget->isTargetELF() &&
1776 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
1777 MachineFunction &MF = DAG.getMachineFunction();
1778 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1779 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1780 EVT PtrVT = getPointerTy();
1781 DebugLoc dl = Op.getDebugLoc();
1782 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1783 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1784 "_GLOBAL_OFFSET_TABLE_",
1785 ARMPCLabelIndex, PCAdj);
1786 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1787 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1788 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1789 PseudoSourceValue::getConstantPool(), 0,
1791 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1792 return DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1796 ARMTargetLowering::LowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const {
1797 DebugLoc dl = Op.getDebugLoc();
1798 SDValue Val = DAG.getConstant(0, MVT::i32);
1799 return DAG.getNode(ARMISD::EH_SJLJ_SETJMP, dl, MVT::i32, Op.getOperand(0),
1800 Op.getOperand(1), Val);
1804 ARMTargetLowering::LowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const {
1805 DebugLoc dl = Op.getDebugLoc();
1806 return DAG.getNode(ARMISD::EH_SJLJ_LONGJMP, dl, MVT::Other, Op.getOperand(0),
1807 Op.getOperand(1), DAG.getConstant(0, MVT::i32));
1811 ARMTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG,
1812 const ARMSubtarget *Subtarget)
1814 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1815 DebugLoc dl = Op.getDebugLoc();
1817 default: return SDValue(); // Don't custom lower most intrinsics.
1818 case Intrinsic::arm_thread_pointer: {
1819 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1820 return DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
1822 case Intrinsic::eh_sjlj_lsda: {
1823 MachineFunction &MF = DAG.getMachineFunction();
1824 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1825 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1826 EVT PtrVT = getPointerTy();
1827 DebugLoc dl = Op.getDebugLoc();
1828 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1830 unsigned PCAdj = (RelocM != Reloc::PIC_)
1831 ? 0 : (Subtarget->isThumb() ? 4 : 8);
1832 ARMConstantPoolValue *CPV =
1833 new ARMConstantPoolValue(MF.getFunction(), ARMPCLabelIndex,
1834 ARMCP::CPLSDA, PCAdj);
1835 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1836 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1838 DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1839 PseudoSourceValue::getConstantPool(), 0,
1841 SDValue Chain = Result.getValue(1);
1843 if (RelocM == Reloc::PIC_) {
1844 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1845 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1852 static SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG &DAG,
1853 const ARMSubtarget *Subtarget) {
1854 DebugLoc dl = Op.getDebugLoc();
1855 SDValue Op5 = Op.getOperand(5);
1857 unsigned isDeviceBarrier = cast<ConstantSDNode>(Op5)->getZExtValue();
1858 if (isDeviceBarrier) {
1859 if (Subtarget->hasV7Ops())
1860 Res = DAG.getNode(ARMISD::SYNCBARRIER, dl, MVT::Other, Op.getOperand(0));
1862 Res = DAG.getNode(ARMISD::SYNCBARRIER, dl, MVT::Other, Op.getOperand(0),
1863 DAG.getConstant(0, MVT::i32));
1865 if (Subtarget->hasV7Ops())
1866 Res = DAG.getNode(ARMISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0));
1868 Res = DAG.getNode(ARMISD::MEMBARRIER, dl, MVT::Other, Op.getOperand(0),
1869 DAG.getConstant(0, MVT::i32));
1874 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) {
1875 MachineFunction &MF = DAG.getMachineFunction();
1876 ARMFunctionInfo *FuncInfo = MF.getInfo<ARMFunctionInfo>();
1878 // vastart just stores the address of the VarArgsFrameIndex slot into the
1879 // memory location argument.
1880 DebugLoc dl = Op.getDebugLoc();
1881 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1882 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
1883 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1884 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1), SV, 0,
1889 ARMTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
1890 SelectionDAG &DAG) const {
1891 SDNode *Node = Op.getNode();
1892 DebugLoc dl = Node->getDebugLoc();
1893 EVT VT = Node->getValueType(0);
1894 SDValue Chain = Op.getOperand(0);
1895 SDValue Size = Op.getOperand(1);
1896 SDValue Align = Op.getOperand(2);
1898 // Chain the dynamic stack allocation so that it doesn't modify the stack
1899 // pointer when other instructions are using the stack.
1900 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
1902 unsigned AlignVal = cast<ConstantSDNode>(Align)->getZExtValue();
1903 unsigned StackAlign = getTargetMachine().getFrameInfo()->getStackAlignment();
1904 if (AlignVal > StackAlign)
1905 // Do this now since selection pass cannot introduce new target
1906 // independent node.
1907 Align = DAG.getConstant(-(uint64_t)AlignVal, VT);
1909 // In Thumb1 mode, there isn't a "sub r, sp, r" instruction, we will end up
1910 // using a "add r, sp, r" instead. Negate the size now so we don't have to
1911 // do even more horrible hack later.
1912 MachineFunction &MF = DAG.getMachineFunction();
1913 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1914 if (AFI->isThumb1OnlyFunction()) {
1916 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Size);
1918 uint32_t Val = C->getZExtValue();
1919 if (Val <= 508 && ((Val & 3) == 0))
1923 Size = DAG.getNode(ISD::SUB, dl, VT, DAG.getConstant(0, VT), Size);
1926 SDVTList VTList = DAG.getVTList(VT, MVT::Other);
1927 SDValue Ops1[] = { Chain, Size, Align };
1928 SDValue Res = DAG.getNode(ARMISD::DYN_ALLOC, dl, VTList, Ops1, 3);
1929 Chain = Res.getValue(1);
1930 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true),
1931 DAG.getIntPtrConstant(0, true), SDValue());
1932 SDValue Ops2[] = { Res, Chain };
1933 return DAG.getMergeValues(Ops2, 2, dl);
1937 ARMTargetLowering::GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
1938 SDValue &Root, SelectionDAG &DAG,
1939 DebugLoc dl) const {
1940 MachineFunction &MF = DAG.getMachineFunction();
1941 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1943 TargetRegisterClass *RC;
1944 if (AFI->isThumb1OnlyFunction())
1945 RC = ARM::tGPRRegisterClass;
1947 RC = ARM::GPRRegisterClass;
1949 // Transform the arguments stored in physical registers into virtual ones.
1950 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
1951 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
1954 if (NextVA.isMemLoc()) {
1955 MachineFrameInfo *MFI = MF.getFrameInfo();
1956 int FI = MFI->CreateFixedObject(4, NextVA.getLocMemOffset(), true, false);
1958 // Create load node to retrieve arguments from the stack.
1959 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1960 ArgValue2 = DAG.getLoad(MVT::i32, dl, Root, FIN,
1961 PseudoSourceValue::getFixedStack(FI), 0,
1964 Reg = MF.addLiveIn(NextVA.getLocReg(), RC);
1965 ArgValue2 = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
1968 return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, ArgValue, ArgValue2);
1972 ARMTargetLowering::LowerFormalArguments(SDValue Chain,
1973 CallingConv::ID CallConv, bool isVarArg,
1974 const SmallVectorImpl<ISD::InputArg>
1976 DebugLoc dl, SelectionDAG &DAG,
1977 SmallVectorImpl<SDValue> &InVals)
1980 MachineFunction &MF = DAG.getMachineFunction();
1981 MachineFrameInfo *MFI = MF.getFrameInfo();
1983 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1985 // Assign locations to all of the incoming arguments.
1986 SmallVector<CCValAssign, 16> ArgLocs;
1987 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
1989 CCInfo.AnalyzeFormalArguments(Ins,
1990 CCAssignFnForNode(CallConv, /* Return*/ false,
1993 SmallVector<SDValue, 16> ArgValues;
1995 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1996 CCValAssign &VA = ArgLocs[i];
1998 // Arguments stored in registers.
1999 if (VA.isRegLoc()) {
2000 EVT RegVT = VA.getLocVT();
2003 if (VA.needsCustom()) {
2004 // f64 and vector types are split up into multiple registers or
2005 // combinations of registers and stack slots.
2006 if (VA.getLocVT() == MVT::v2f64) {
2007 SDValue ArgValue1 = GetF64FormalArgument(VA, ArgLocs[++i],
2009 VA = ArgLocs[++i]; // skip ahead to next loc
2011 if (VA.isMemLoc()) {
2012 int FI = MFI->CreateFixedObject(8, VA.getLocMemOffset(),
2014 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
2015 ArgValue2 = DAG.getLoad(MVT::f64, dl, Chain, FIN,
2016 PseudoSourceValue::getFixedStack(FI), 0,
2019 ArgValue2 = GetF64FormalArgument(VA, ArgLocs[++i],
2022 ArgValue = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
2023 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
2024 ArgValue, ArgValue1, DAG.getIntPtrConstant(0));
2025 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
2026 ArgValue, ArgValue2, DAG.getIntPtrConstant(1));
2028 ArgValue = GetF64FormalArgument(VA, ArgLocs[++i], Chain, DAG, dl);
2031 TargetRegisterClass *RC;
2033 if (RegVT == MVT::f32)
2034 RC = ARM::SPRRegisterClass;
2035 else if (RegVT == MVT::f64)
2036 RC = ARM::DPRRegisterClass;
2037 else if (RegVT == MVT::v2f64)
2038 RC = ARM::QPRRegisterClass;
2039 else if (RegVT == MVT::i32)
2040 RC = (AFI->isThumb1OnlyFunction() ?
2041 ARM::tGPRRegisterClass : ARM::GPRRegisterClass);
2043 llvm_unreachable("RegVT not supported by FORMAL_ARGUMENTS Lowering");
2045 // Transform the arguments in physical registers into virtual ones.
2046 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
2047 ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
2050 // If this is an 8 or 16-bit value, it is really passed promoted
2051 // to 32 bits. Insert an assert[sz]ext to capture this, then
2052 // truncate to the right size.
2053 switch (VA.getLocInfo()) {
2054 default: llvm_unreachable("Unknown loc info!");
2055 case CCValAssign::Full: break;
2056 case CCValAssign::BCvt:
2057 ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), ArgValue);
2059 case CCValAssign::SExt:
2060 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
2061 DAG.getValueType(VA.getValVT()));
2062 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
2064 case CCValAssign::ZExt:
2065 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
2066 DAG.getValueType(VA.getValVT()));
2067 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
2071 InVals.push_back(ArgValue);
2073 } else { // VA.isRegLoc()
2076 assert(VA.isMemLoc());
2077 assert(VA.getValVT() != MVT::i64 && "i64 should already be lowered");
2079 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
2080 int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset(),
2083 // Create load nodes to retrieve arguments from the stack.
2084 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
2085 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
2086 PseudoSourceValue::getFixedStack(FI), 0,
2093 static const unsigned GPRArgRegs[] = {
2094 ARM::R0, ARM::R1, ARM::R2, ARM::R3
2097 unsigned NumGPRs = CCInfo.getFirstUnallocated
2098 (GPRArgRegs, sizeof(GPRArgRegs) / sizeof(GPRArgRegs[0]));
2100 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
2101 unsigned VARegSize = (4 - NumGPRs) * 4;
2102 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
2103 unsigned ArgOffset = CCInfo.getNextStackOffset();
2104 if (VARegSaveSize) {
2105 // If this function is vararg, store any remaining integer argument regs
2106 // to their spots on the stack so that they may be loaded by deferencing
2107 // the result of va_next.
2108 AFI->setVarArgsRegSaveSize(VARegSaveSize);
2109 AFI->setVarArgsFrameIndex(
2110 MFI->CreateFixedObject(VARegSaveSize,
2111 ArgOffset + VARegSaveSize - VARegSize,
2113 SDValue FIN = DAG.getFrameIndex(AFI->getVarArgsFrameIndex(),
2116 SmallVector<SDValue, 4> MemOps;
2117 for (; NumGPRs < 4; ++NumGPRs) {
2118 TargetRegisterClass *RC;
2119 if (AFI->isThumb1OnlyFunction())
2120 RC = ARM::tGPRRegisterClass;
2122 RC = ARM::GPRRegisterClass;
2124 unsigned VReg = MF.addLiveIn(GPRArgRegs[NumGPRs], RC);
2125 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
2127 DAG.getStore(Val.getValue(1), dl, Val, FIN,
2128 PseudoSourceValue::getFixedStack(AFI->getVarArgsFrameIndex()),
2129 0, false, false, 0);
2130 MemOps.push_back(Store);
2131 FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), FIN,
2132 DAG.getConstant(4, getPointerTy()));
2134 if (!MemOps.empty())
2135 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
2136 &MemOps[0], MemOps.size());
2138 // This will point to the next argument passed via stack.
2139 AFI->setVarArgsFrameIndex(MFI->CreateFixedObject(4, ArgOffset,
2146 /// isFloatingPointZero - Return true if this is +0.0.
2147 static bool isFloatingPointZero(SDValue Op) {
2148 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
2149 return CFP->getValueAPF().isPosZero();
2150 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
2151 // Maybe this has already been legalized into the constant pool?
2152 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
2153 SDValue WrapperOp = Op.getOperand(1).getOperand(0);
2154 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
2155 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
2156 return CFP->getValueAPF().isPosZero();
2162 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
2163 /// the given operands.
2165 ARMTargetLowering::getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
2166 SDValue &ARMCC, SelectionDAG &DAG,
2167 DebugLoc dl) const {
2168 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
2169 unsigned C = RHSC->getZExtValue();
2170 if (!isLegalICmpImmediate(C)) {
2171 // Constant does not fit, try adjusting it by one?
2176 if (isLegalICmpImmediate(C-1)) {
2177 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
2178 RHS = DAG.getConstant(C-1, MVT::i32);
2183 if (C > 0 && isLegalICmpImmediate(C-1)) {
2184 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
2185 RHS = DAG.getConstant(C-1, MVT::i32);
2190 if (isLegalICmpImmediate(C+1)) {
2191 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
2192 RHS = DAG.getConstant(C+1, MVT::i32);
2197 if (C < 0xffffffff && isLegalICmpImmediate(C+1)) {
2198 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
2199 RHS = DAG.getConstant(C+1, MVT::i32);
2206 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
2207 ARMISD::NodeType CompareType;
2210 CompareType = ARMISD::CMP;
2215 CompareType = ARMISD::CMPZ;
2218 ARMCC = DAG.getConstant(CondCode, MVT::i32);
2219 return DAG.getNode(CompareType, dl, MVT::Flag, LHS, RHS);
2222 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
2223 static SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
2226 if (!isFloatingPointZero(RHS))
2227 Cmp = DAG.getNode(ARMISD::CMPFP, dl, MVT::Flag, LHS, RHS);
2229 Cmp = DAG.getNode(ARMISD::CMPFPw0, dl, MVT::Flag, LHS);
2230 return DAG.getNode(ARMISD::FMSTAT, dl, MVT::Flag, Cmp);
2233 SDValue ARMTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
2234 EVT VT = Op.getValueType();
2235 SDValue LHS = Op.getOperand(0);
2236 SDValue RHS = Op.getOperand(1);
2237 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
2238 SDValue TrueVal = Op.getOperand(2);
2239 SDValue FalseVal = Op.getOperand(3);
2240 DebugLoc dl = Op.getDebugLoc();
2242 if (LHS.getValueType() == MVT::i32) {
2244 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2245 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, dl);
2246 return DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC, CCR,Cmp);
2249 ARMCC::CondCodes CondCode, CondCode2;
2250 FPCCToARMCC(CC, CondCode, CondCode2);
2252 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
2253 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2254 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
2255 SDValue Result = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal,
2257 if (CondCode2 != ARMCC::AL) {
2258 SDValue ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
2259 // FIXME: Needs another CMP because flag can have but one use.
2260 SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG, dl);
2261 Result = DAG.getNode(ARMISD::CMOV, dl, VT,
2262 Result, TrueVal, ARMCC2, CCR, Cmp2);
2267 SDValue ARMTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
2268 SDValue Chain = Op.getOperand(0);
2269 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
2270 SDValue LHS = Op.getOperand(2);
2271 SDValue RHS = Op.getOperand(3);
2272 SDValue Dest = Op.getOperand(4);
2273 DebugLoc dl = Op.getDebugLoc();
2275 if (LHS.getValueType() == MVT::i32) {
2277 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2278 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, dl);
2279 return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other,
2280 Chain, Dest, ARMCC, CCR,Cmp);
2283 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
2284 ARMCC::CondCodes CondCode, CondCode2;
2285 FPCCToARMCC(CC, CondCode, CondCode2);
2287 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
2288 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
2289 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2290 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
2291 SDValue Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
2292 SDValue Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
2293 if (CondCode2 != ARMCC::AL) {
2294 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
2295 SDValue Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
2296 Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
2301 SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) const {
2302 SDValue Chain = Op.getOperand(0);
2303 SDValue Table = Op.getOperand(1);
2304 SDValue Index = Op.getOperand(2);
2305 DebugLoc dl = Op.getDebugLoc();
2307 EVT PTy = getPointerTy();
2308 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
2309 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
2310 SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
2311 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
2312 Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId);
2313 Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
2314 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
2315 if (Subtarget->isThumb2()) {
2316 // Thumb2 uses a two-level jump. That is, it jumps into the jump table
2317 // which does another jump to the destination. This also makes it easier
2318 // to translate it to TBB / TBH later.
2319 // FIXME: This might not work if the function is extremely large.
2320 return DAG.getNode(ARMISD::BR2_JT, dl, MVT::Other, Chain,
2321 Addr, Op.getOperand(2), JTI, UId);
2323 if (getTargetMachine().getRelocationModel() == Reloc::PIC_) {
2324 Addr = DAG.getLoad((EVT)MVT::i32, dl, Chain, Addr,
2325 PseudoSourceValue::getJumpTable(), 0,
2327 Chain = Addr.getValue(1);
2328 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr, Table);
2329 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
2331 Addr = DAG.getLoad(PTy, dl, Chain, Addr,
2332 PseudoSourceValue::getJumpTable(), 0, false, false, 0);
2333 Chain = Addr.getValue(1);
2334 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
2338 static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
2339 DebugLoc dl = Op.getDebugLoc();
2342 switch (Op.getOpcode()) {
2344 assert(0 && "Invalid opcode!");
2345 case ISD::FP_TO_SINT:
2346 Opc = ARMISD::FTOSI;
2348 case ISD::FP_TO_UINT:
2349 Opc = ARMISD::FTOUI;
2352 Op = DAG.getNode(Opc, dl, MVT::f32, Op.getOperand(0));
2353 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op);
2356 static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
2357 EVT VT = Op.getValueType();
2358 DebugLoc dl = Op.getDebugLoc();
2361 switch (Op.getOpcode()) {
2363 assert(0 && "Invalid opcode!");
2364 case ISD::SINT_TO_FP:
2365 Opc = ARMISD::SITOF;
2367 case ISD::UINT_TO_FP:
2368 Opc = ARMISD::UITOF;
2372 Op = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Op.getOperand(0));
2373 return DAG.getNode(Opc, dl, VT, Op);
2376 static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
2377 // Implement fcopysign with a fabs and a conditional fneg.
2378 SDValue Tmp0 = Op.getOperand(0);
2379 SDValue Tmp1 = Op.getOperand(1);
2380 DebugLoc dl = Op.getDebugLoc();
2381 EVT VT = Op.getValueType();
2382 EVT SrcVT = Tmp1.getValueType();
2383 SDValue AbsVal = DAG.getNode(ISD::FABS, dl, VT, Tmp0);
2384 SDValue Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG, dl);
2385 SDValue ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
2386 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2387 return DAG.getNode(ARMISD::CNEG, dl, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
2390 SDValue ARMTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const{
2391 MachineFunction &MF = DAG.getMachineFunction();
2392 MachineFrameInfo *MFI = MF.getFrameInfo();
2393 MFI->setReturnAddressIsTaken(true);
2395 EVT VT = Op.getValueType();
2396 DebugLoc dl = Op.getDebugLoc();
2397 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
2399 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
2400 SDValue Offset = DAG.getConstant(4, MVT::i32);
2401 return DAG.getLoad(VT, dl, DAG.getEntryNode(),
2402 DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset),
2403 NULL, 0, false, false, 0);
2406 // Return LR, which contains the return address. Mark it an implicit live-in.
2407 unsigned Reg = MF.addLiveIn(ARM::LR, ARM::GPRRegisterClass);
2408 return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
2411 SDValue ARMTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
2412 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
2413 MFI->setFrameAddressIsTaken(true);
2415 EVT VT = Op.getValueType();
2416 DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful
2417 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
2418 unsigned FrameReg = (Subtarget->isThumb() || Subtarget->isTargetDarwin())
2419 ? ARM::R7 : ARM::R11;
2420 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
2422 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr, NULL, 0,
2427 /// ExpandBIT_CONVERT - If the target supports VFP, this function is called to
2428 /// expand a bit convert where either the source or destination type is i64 to
2429 /// use a VMOVDRR or VMOVRRD node. This should not be done when the non-i64
2430 /// operand type is illegal (e.g., v2f32 for a target that doesn't support
2431 /// vectors), since the legalizer won't know what to do with that.
2432 static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
2433 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2434 DebugLoc dl = N->getDebugLoc();
2435 SDValue Op = N->getOperand(0);
2437 // This function is only supposed to be called for i64 types, either as the
2438 // source or destination of the bit convert.
2439 EVT SrcVT = Op.getValueType();
2440 EVT DstVT = N->getValueType(0);
2441 assert((SrcVT == MVT::i64 || DstVT == MVT::i64) &&
2442 "ExpandBIT_CONVERT called for non-i64 type");
2444 // Turn i64->f64 into VMOVDRR.
2445 if (SrcVT == MVT::i64 && TLI.isTypeLegal(DstVT)) {
2446 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
2447 DAG.getConstant(0, MVT::i32));
2448 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
2449 DAG.getConstant(1, MVT::i32));
2450 return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
2453 // Turn f64->i64 into VMOVRRD.
2454 if (DstVT == MVT::i64 && TLI.isTypeLegal(SrcVT)) {
2455 SDValue Cvt = DAG.getNode(ARMISD::VMOVRRD, dl,
2456 DAG.getVTList(MVT::i32, MVT::i32), &Op, 1);
2457 // Merge the pieces into a single i64 value.
2458 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Cvt, Cvt.getValue(1));
2464 /// getZeroVector - Returns a vector of specified type with all zero elements.
2466 static SDValue getZeroVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2467 assert(VT.isVector() && "Expected a vector type");
2469 // Zero vectors are used to represent vector negation and in those cases
2470 // will be implemented with the NEON VNEG instruction. However, VNEG does
2471 // not support i64 elements, so sometimes the zero vectors will need to be
2472 // explicitly constructed. For those cases, and potentially other uses in
2473 // the future, always build zero vectors as <16 x i8> or <8 x i8> bitcasted
2474 // to their dest type. This ensures they get CSE'd.
2476 SDValue Cst = DAG.getTargetConstant(0, MVT::i8);
2477 SmallVector<SDValue, 8> Ops;
2480 if (VT.getSizeInBits() == 64) {
2481 Ops.assign(8, Cst); TVT = MVT::v8i8;
2483 Ops.assign(16, Cst); TVT = MVT::v16i8;
2485 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size());
2487 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec);
2490 /// getOnesVector - Returns a vector of specified type with all bits set.
2492 static SDValue getOnesVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2493 assert(VT.isVector() && "Expected a vector type");
2495 // Always build ones vectors as <16 x i8> or <8 x i8> bitcasted to their
2496 // dest type. This ensures they get CSE'd.
2498 SDValue Cst = DAG.getTargetConstant(0xFF, MVT::i8);
2499 SmallVector<SDValue, 8> Ops;
2502 if (VT.getSizeInBits() == 64) {
2503 Ops.assign(8, Cst); TVT = MVT::v8i8;
2505 Ops.assign(16, Cst); TVT = MVT::v16i8;
2507 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size());
2509 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec);
2512 /// LowerShiftRightParts - Lower SRA_PARTS, which returns two
2513 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
2514 SDValue ARMTargetLowering::LowerShiftRightParts(SDValue Op,
2515 SelectionDAG &DAG) const {
2516 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
2517 EVT VT = Op.getValueType();
2518 unsigned VTBits = VT.getSizeInBits();
2519 DebugLoc dl = Op.getDebugLoc();
2520 SDValue ShOpLo = Op.getOperand(0);
2521 SDValue ShOpHi = Op.getOperand(1);
2522 SDValue ShAmt = Op.getOperand(2);
2524 unsigned Opc = (Op.getOpcode() == ISD::SRA_PARTS) ? ISD::SRA : ISD::SRL;
2526 assert(Op.getOpcode() == ISD::SRA_PARTS || Op.getOpcode() == ISD::SRL_PARTS);
2528 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
2529 DAG.getConstant(VTBits, MVT::i32), ShAmt);
2530 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, ShAmt);
2531 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
2532 DAG.getConstant(VTBits, MVT::i32));
2533 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, RevShAmt);
2534 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2535 SDValue TrueVal = DAG.getNode(Opc, dl, VT, ShOpHi, ExtraShAmt);
2537 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2538 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
2540 SDValue Hi = DAG.getNode(Opc, dl, VT, ShOpHi, ShAmt);
2541 SDValue Lo = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC,
2544 SDValue Ops[2] = { Lo, Hi };
2545 return DAG.getMergeValues(Ops, 2, dl);
2548 /// LowerShiftLeftParts - Lower SHL_PARTS, which returns two
2549 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
2550 SDValue ARMTargetLowering::LowerShiftLeftParts(SDValue Op,
2551 SelectionDAG &DAG) const {
2552 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
2553 EVT VT = Op.getValueType();
2554 unsigned VTBits = VT.getSizeInBits();
2555 DebugLoc dl = Op.getDebugLoc();
2556 SDValue ShOpLo = Op.getOperand(0);
2557 SDValue ShOpHi = Op.getOperand(1);
2558 SDValue ShAmt = Op.getOperand(2);
2561 assert(Op.getOpcode() == ISD::SHL_PARTS);
2562 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
2563 DAG.getConstant(VTBits, MVT::i32), ShAmt);
2564 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, RevShAmt);
2565 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
2566 DAG.getConstant(VTBits, MVT::i32));
2567 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, ShAmt);
2568 SDValue Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ExtraShAmt);
2570 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2571 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2572 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
2574 SDValue Lo = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt);
2575 SDValue Hi = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, Tmp3, ARMCC,
2578 SDValue Ops[2] = { Lo, Hi };
2579 return DAG.getMergeValues(Ops, 2, dl);
2582 static SDValue LowerCTTZ(SDNode *N, SelectionDAG &DAG,
2583 const ARMSubtarget *ST) {
2584 EVT VT = N->getValueType(0);
2585 DebugLoc dl = N->getDebugLoc();
2587 if (!ST->hasV6T2Ops())
2590 SDValue rbit = DAG.getNode(ARMISD::RBIT, dl, VT, N->getOperand(0));
2591 return DAG.getNode(ISD::CTLZ, dl, VT, rbit);
2594 static SDValue LowerShift(SDNode *N, SelectionDAG &DAG,
2595 const ARMSubtarget *ST) {
2596 EVT VT = N->getValueType(0);
2597 DebugLoc dl = N->getDebugLoc();
2599 // Lower vector shifts on NEON to use VSHL.
2600 if (VT.isVector()) {
2601 assert(ST->hasNEON() && "unexpected vector shift");
2603 // Left shifts translate directly to the vshiftu intrinsic.
2604 if (N->getOpcode() == ISD::SHL)
2605 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
2606 DAG.getConstant(Intrinsic::arm_neon_vshiftu, MVT::i32),
2607 N->getOperand(0), N->getOperand(1));
2609 assert((N->getOpcode() == ISD::SRA ||
2610 N->getOpcode() == ISD::SRL) && "unexpected vector shift opcode");
2612 // NEON uses the same intrinsics for both left and right shifts. For
2613 // right shifts, the shift amounts are negative, so negate the vector of
2615 EVT ShiftVT = N->getOperand(1).getValueType();
2616 SDValue NegatedCount = DAG.getNode(ISD::SUB, dl, ShiftVT,
2617 getZeroVector(ShiftVT, DAG, dl),
2619 Intrinsic::ID vshiftInt = (N->getOpcode() == ISD::SRA ?
2620 Intrinsic::arm_neon_vshifts :
2621 Intrinsic::arm_neon_vshiftu);
2622 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
2623 DAG.getConstant(vshiftInt, MVT::i32),
2624 N->getOperand(0), NegatedCount);
2627 // We can get here for a node like i32 = ISD::SHL i32, i64
2631 assert((N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
2632 "Unknown shift to lower!");
2634 // We only lower SRA, SRL of 1 here, all others use generic lowering.
2635 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
2636 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1)
2639 // If we are in thumb mode, we don't have RRX.
2640 if (ST->isThumb1Only()) return SDValue();
2642 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
2643 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
2644 DAG.getConstant(0, MVT::i32));
2645 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
2646 DAG.getConstant(1, MVT::i32));
2648 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
2649 // captures the result into a carry flag.
2650 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
2651 Hi = DAG.getNode(Opc, dl, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
2653 // The low part is an ARMISD::RRX operand, which shifts the carry in.
2654 Lo = DAG.getNode(ARMISD::RRX, dl, MVT::i32, Lo, Hi.getValue(1));
2656 // Merge the pieces into a single i64 value.
2657 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
2660 static SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) {
2661 SDValue TmpOp0, TmpOp1;
2662 bool Invert = false;
2666 SDValue Op0 = Op.getOperand(0);
2667 SDValue Op1 = Op.getOperand(1);
2668 SDValue CC = Op.getOperand(2);
2669 EVT VT = Op.getValueType();
2670 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
2671 DebugLoc dl = Op.getDebugLoc();
2673 if (Op.getOperand(1).getValueType().isFloatingPoint()) {
2674 switch (SetCCOpcode) {
2675 default: llvm_unreachable("Illegal FP comparison"); break;
2677 case ISD::SETNE: Invert = true; // Fallthrough
2679 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
2681 case ISD::SETLT: Swap = true; // Fallthrough
2683 case ISD::SETGT: Opc = ARMISD::VCGT; break;
2685 case ISD::SETLE: Swap = true; // Fallthrough
2687 case ISD::SETGE: Opc = ARMISD::VCGE; break;
2688 case ISD::SETUGE: Swap = true; // Fallthrough
2689 case ISD::SETULE: Invert = true; Opc = ARMISD::VCGT; break;
2690 case ISD::SETUGT: Swap = true; // Fallthrough
2691 case ISD::SETULT: Invert = true; Opc = ARMISD::VCGE; break;
2692 case ISD::SETUEQ: Invert = true; // Fallthrough
2694 // Expand this to (OLT | OGT).
2698 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
2699 Op1 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp0, TmpOp1);
2701 case ISD::SETUO: Invert = true; // Fallthrough
2703 // Expand this to (OLT | OGE).
2707 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
2708 Op1 = DAG.getNode(ARMISD::VCGE, dl, VT, TmpOp0, TmpOp1);
2712 // Integer comparisons.
2713 switch (SetCCOpcode) {
2714 default: llvm_unreachable("Illegal integer comparison"); break;
2715 case ISD::SETNE: Invert = true;
2716 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
2717 case ISD::SETLT: Swap = true;
2718 case ISD::SETGT: Opc = ARMISD::VCGT; break;
2719 case ISD::SETLE: Swap = true;
2720 case ISD::SETGE: Opc = ARMISD::VCGE; break;
2721 case ISD::SETULT: Swap = true;
2722 case ISD::SETUGT: Opc = ARMISD::VCGTU; break;
2723 case ISD::SETULE: Swap = true;
2724 case ISD::SETUGE: Opc = ARMISD::VCGEU; break;
2727 // Detect VTST (Vector Test Bits) = icmp ne (and (op0, op1), zero).
2728 if (Opc == ARMISD::VCEQ) {
2731 if (ISD::isBuildVectorAllZeros(Op1.getNode()))
2733 else if (ISD::isBuildVectorAllZeros(Op0.getNode()))
2736 // Ignore bitconvert.
2737 if (AndOp.getNode() && AndOp.getOpcode() == ISD::BIT_CONVERT)
2738 AndOp = AndOp.getOperand(0);
2740 if (AndOp.getNode() && AndOp.getOpcode() == ISD::AND) {
2742 Op0 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(0));
2743 Op1 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(1));
2750 std::swap(Op0, Op1);
2752 SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
2755 Result = DAG.getNOT(dl, Result, VT);
2760 /// isVMOVSplat - Check if the specified splat value corresponds to an immediate
2761 /// VMOV instruction, and if so, return the constant being splatted.
2762 static SDValue isVMOVSplat(uint64_t SplatBits, uint64_t SplatUndef,
2763 unsigned SplatBitSize, SelectionDAG &DAG) {
2764 switch (SplatBitSize) {
2766 // Any 1-byte value is OK.
2767 assert((SplatBits & ~0xff) == 0 && "one byte splat value is too big");
2768 return DAG.getTargetConstant(SplatBits, MVT::i8);
2771 // NEON's 16-bit VMOV supports splat values where only one byte is nonzero.
2772 if ((SplatBits & ~0xff) == 0 ||
2773 (SplatBits & ~0xff00) == 0)
2774 return DAG.getTargetConstant(SplatBits, MVT::i16);
2778 // NEON's 32-bit VMOV supports splat values where:
2779 // * only one byte is nonzero, or
2780 // * the least significant byte is 0xff and the second byte is nonzero, or
2781 // * the least significant 2 bytes are 0xff and the third is nonzero.
2782 if ((SplatBits & ~0xff) == 0 ||
2783 (SplatBits & ~0xff00) == 0 ||
2784 (SplatBits & ~0xff0000) == 0 ||
2785 (SplatBits & ~0xff000000) == 0)
2786 return DAG.getTargetConstant(SplatBits, MVT::i32);
2788 if ((SplatBits & ~0xffff) == 0 &&
2789 ((SplatBits | SplatUndef) & 0xff) == 0xff)
2790 return DAG.getTargetConstant(SplatBits | 0xff, MVT::i32);
2792 if ((SplatBits & ~0xffffff) == 0 &&
2793 ((SplatBits | SplatUndef) & 0xffff) == 0xffff)
2794 return DAG.getTargetConstant(SplatBits | 0xffff, MVT::i32);
2796 // Note: there are a few 32-bit splat values (specifically: 00ffff00,
2797 // ff000000, ff0000ff, and ffff00ff) that are valid for VMOV.I64 but not
2798 // VMOV.I32. A (very) minor optimization would be to replicate the value
2799 // and fall through here to test for a valid 64-bit splat. But, then the
2800 // caller would also need to check and handle the change in size.
2804 // NEON has a 64-bit VMOV splat where each byte is either 0 or 0xff.
2805 uint64_t BitMask = 0xff;
2807 for (int ByteNum = 0; ByteNum < 8; ++ByteNum) {
2808 if (((SplatBits | SplatUndef) & BitMask) == BitMask)
2810 else if ((SplatBits & BitMask) != 0)
2814 return DAG.getTargetConstant(Val, MVT::i64);
2818 llvm_unreachable("unexpected size for isVMOVSplat");
2825 /// getVMOVImm - If this is a build_vector of constants which can be
2826 /// formed by using a VMOV instruction of the specified element size,
2827 /// return the constant being splatted. The ByteSize field indicates the
2828 /// number of bytes of each element [1248].
2829 SDValue ARM::getVMOVImm(SDNode *N, unsigned ByteSize, SelectionDAG &DAG) {
2830 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N);
2831 APInt SplatBits, SplatUndef;
2832 unsigned SplatBitSize;
2834 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
2835 HasAnyUndefs, ByteSize * 8))
2838 if (SplatBitSize > ByteSize * 8)
2841 return isVMOVSplat(SplatBits.getZExtValue(), SplatUndef.getZExtValue(),
2845 static bool isVEXTMask(const SmallVectorImpl<int> &M, EVT VT,
2846 bool &ReverseVEXT, unsigned &Imm) {
2847 unsigned NumElts = VT.getVectorNumElements();
2848 ReverseVEXT = false;
2851 // If this is a VEXT shuffle, the immediate value is the index of the first
2852 // element. The other shuffle indices must be the successive elements after
2854 unsigned ExpectedElt = Imm;
2855 for (unsigned i = 1; i < NumElts; ++i) {
2856 // Increment the expected index. If it wraps around, it may still be
2857 // a VEXT but the source vectors must be swapped.
2859 if (ExpectedElt == NumElts * 2) {
2864 if (ExpectedElt != static_cast<unsigned>(M[i]))
2868 // Adjust the index value if the source operands will be swapped.
2875 /// isVREVMask - Check if a vector shuffle corresponds to a VREV
2876 /// instruction with the specified blocksize. (The order of the elements
2877 /// within each block of the vector is reversed.)
2878 static bool isVREVMask(const SmallVectorImpl<int> &M, EVT VT,
2879 unsigned BlockSize) {
2880 assert((BlockSize==16 || BlockSize==32 || BlockSize==64) &&
2881 "Only possible block sizes for VREV are: 16, 32, 64");
2883 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2887 unsigned NumElts = VT.getVectorNumElements();
2888 unsigned BlockElts = M[0] + 1;
2890 if (BlockSize <= EltSz || BlockSize != BlockElts * EltSz)
2893 for (unsigned i = 0; i < NumElts; ++i) {
2894 if ((unsigned) M[i] !=
2895 (i - i%BlockElts) + (BlockElts - 1 - i%BlockElts))
2902 static bool isVTRNMask(const SmallVectorImpl<int> &M, EVT VT,
2903 unsigned &WhichResult) {
2904 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2908 unsigned NumElts = VT.getVectorNumElements();
2909 WhichResult = (M[0] == 0 ? 0 : 1);
2910 for (unsigned i = 0; i < NumElts; i += 2) {
2911 if ((unsigned) M[i] != i + WhichResult ||
2912 (unsigned) M[i+1] != i + NumElts + WhichResult)
2918 /// isVTRN_v_undef_Mask - Special case of isVTRNMask for canonical form of
2919 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
2920 /// Mask is e.g., <0, 0, 2, 2> instead of <0, 4, 2, 6>.
2921 static bool isVTRN_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
2922 unsigned &WhichResult) {
2923 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2927 unsigned NumElts = VT.getVectorNumElements();
2928 WhichResult = (M[0] == 0 ? 0 : 1);
2929 for (unsigned i = 0; i < NumElts; i += 2) {
2930 if ((unsigned) M[i] != i + WhichResult ||
2931 (unsigned) M[i+1] != i + WhichResult)
2937 static bool isVUZPMask(const SmallVectorImpl<int> &M, EVT VT,
2938 unsigned &WhichResult) {
2939 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2943 unsigned NumElts = VT.getVectorNumElements();
2944 WhichResult = (M[0] == 0 ? 0 : 1);
2945 for (unsigned i = 0; i != NumElts; ++i) {
2946 if ((unsigned) M[i] != 2 * i + WhichResult)
2950 // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
2951 if (VT.is64BitVector() && EltSz == 32)
2957 /// isVUZP_v_undef_Mask - Special case of isVUZPMask for canonical form of
2958 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
2959 /// Mask is e.g., <0, 2, 0, 2> instead of <0, 2, 4, 6>,
2960 static bool isVUZP_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
2961 unsigned &WhichResult) {
2962 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2966 unsigned Half = VT.getVectorNumElements() / 2;
2967 WhichResult = (M[0] == 0 ? 0 : 1);
2968 for (unsigned j = 0; j != 2; ++j) {
2969 unsigned Idx = WhichResult;
2970 for (unsigned i = 0; i != Half; ++i) {
2971 if ((unsigned) M[i + j * Half] != Idx)
2977 // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
2978 if (VT.is64BitVector() && EltSz == 32)
2984 static bool isVZIPMask(const SmallVectorImpl<int> &M, EVT VT,
2985 unsigned &WhichResult) {
2986 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
2990 unsigned NumElts = VT.getVectorNumElements();
2991 WhichResult = (M[0] == 0 ? 0 : 1);
2992 unsigned Idx = WhichResult * NumElts / 2;
2993 for (unsigned i = 0; i != NumElts; i += 2) {
2994 if ((unsigned) M[i] != Idx ||
2995 (unsigned) M[i+1] != Idx + NumElts)
3000 // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3001 if (VT.is64BitVector() && EltSz == 32)
3007 /// isVZIP_v_undef_Mask - Special case of isVZIPMask for canonical form of
3008 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
3009 /// Mask is e.g., <0, 0, 1, 1> instead of <0, 4, 1, 5>.
3010 static bool isVZIP_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
3011 unsigned &WhichResult) {
3012 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3016 unsigned NumElts = VT.getVectorNumElements();
3017 WhichResult = (M[0] == 0 ? 0 : 1);
3018 unsigned Idx = WhichResult * NumElts / 2;
3019 for (unsigned i = 0; i != NumElts; i += 2) {
3020 if ((unsigned) M[i] != Idx ||
3021 (unsigned) M[i+1] != Idx)
3026 // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3027 if (VT.is64BitVector() && EltSz == 32)
3034 static SDValue BuildSplat(SDValue Val, EVT VT, SelectionDAG &DAG, DebugLoc dl) {
3035 // Canonicalize all-zeros and all-ones vectors.
3036 ConstantSDNode *ConstVal = cast<ConstantSDNode>(Val.getNode());
3037 if (ConstVal->isNullValue())
3038 return getZeroVector(VT, DAG, dl);
3039 if (ConstVal->isAllOnesValue())
3040 return getOnesVector(VT, DAG, dl);
3043 if (VT.is64BitVector()) {
3044 switch (Val.getValueType().getSizeInBits()) {
3045 case 8: CanonicalVT = MVT::v8i8; break;
3046 case 16: CanonicalVT = MVT::v4i16; break;
3047 case 32: CanonicalVT = MVT::v2i32; break;
3048 case 64: CanonicalVT = MVT::v1i64; break;
3049 default: llvm_unreachable("unexpected splat element type"); break;
3052 assert(VT.is128BitVector() && "unknown splat vector size");
3053 switch (Val.getValueType().getSizeInBits()) {
3054 case 8: CanonicalVT = MVT::v16i8; break;
3055 case 16: CanonicalVT = MVT::v8i16; break;
3056 case 32: CanonicalVT = MVT::v4i32; break;
3057 case 64: CanonicalVT = MVT::v2i64; break;
3058 default: llvm_unreachable("unexpected splat element type"); break;
3062 // Build a canonical splat for this value.
3063 SmallVector<SDValue, 8> Ops;
3064 Ops.assign(CanonicalVT.getVectorNumElements(), Val);
3065 SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, dl, CanonicalVT, &Ops[0],
3067 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Res);
3070 // If this is a case we can't handle, return null and let the default
3071 // expansion code take care of it.
3072 static SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) {
3073 BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode());
3074 DebugLoc dl = Op.getDebugLoc();
3075 EVT VT = Op.getValueType();
3077 APInt SplatBits, SplatUndef;
3078 unsigned SplatBitSize;
3080 if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
3081 if (SplatBitSize <= 64) {
3082 SDValue Val = isVMOVSplat(SplatBits.getZExtValue(),
3083 SplatUndef.getZExtValue(), SplatBitSize, DAG);
3085 return BuildSplat(Val, VT, DAG, dl);
3089 // Scan through the operands to see if only one value is used.
3090 unsigned NumElts = VT.getVectorNumElements();
3091 bool isOnlyLowElement = true;
3092 bool usesOnlyOneValue = true;
3093 bool isConstant = true;
3095 for (unsigned i = 0; i < NumElts; ++i) {
3096 SDValue V = Op.getOperand(i);
3097 if (V.getOpcode() == ISD::UNDEF)
3100 isOnlyLowElement = false;
3101 if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V))
3104 if (!Value.getNode())
3106 else if (V != Value)
3107 usesOnlyOneValue = false;
3110 if (!Value.getNode())
3111 return DAG.getUNDEF(VT);
3113 if (isOnlyLowElement)
3114 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value);
3116 // If all elements are constants, fall back to the default expansion, which
3117 // will generate a load from the constant pool.
3121 // Use VDUP for non-constant splats.
3122 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
3123 if (usesOnlyOneValue && EltSize <= 32)
3124 return DAG.getNode(ARMISD::VDUP, dl, VT, Value);
3126 // Vectors with 32- or 64-bit elements can be built by directly assigning
3127 // the subregisters. Lower it to an ARMISD::BUILD_VECTOR so the operands
3128 // will be legalized.
3129 if (EltSize >= 32) {
3130 // Do the expansion with floating-point types, since that is what the VFP
3131 // registers are defined to use, and since i64 is not legal.
3132 EVT EltVT = EVT::getFloatingPointVT(EltSize);
3133 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts);
3134 SmallVector<SDValue, 8> Ops;
3135 for (unsigned i = 0; i < NumElts; ++i)
3136 Ops.push_back(DAG.getNode(ISD::BIT_CONVERT, dl, EltVT, Op.getOperand(i)));
3137 SDValue Val = DAG.getNode(ARMISD::BUILD_VECTOR, dl, VecVT, &Ops[0],NumElts);
3138 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Val);
3144 /// isShuffleMaskLegal - Targets can use this to indicate that they only
3145 /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
3146 /// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
3147 /// are assumed to be legal.
3149 ARMTargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
3151 if (VT.getVectorNumElements() == 4 &&
3152 (VT.is128BitVector() || VT.is64BitVector())) {
3153 unsigned PFIndexes[4];
3154 for (unsigned i = 0; i != 4; ++i) {
3158 PFIndexes[i] = M[i];
3161 // Compute the index in the perfect shuffle table.
3162 unsigned PFTableIndex =
3163 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
3164 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
3165 unsigned Cost = (PFEntry >> 30);
3172 unsigned Imm, WhichResult;
3174 return (ShuffleVectorSDNode::isSplatMask(&M[0], VT) ||
3175 isVREVMask(M, VT, 64) ||
3176 isVREVMask(M, VT, 32) ||
3177 isVREVMask(M, VT, 16) ||
3178 isVEXTMask(M, VT, ReverseVEXT, Imm) ||
3179 isVTRNMask(M, VT, WhichResult) ||
3180 isVUZPMask(M, VT, WhichResult) ||
3181 isVZIPMask(M, VT, WhichResult) ||
3182 isVTRN_v_undef_Mask(M, VT, WhichResult) ||
3183 isVUZP_v_undef_Mask(M, VT, WhichResult) ||
3184 isVZIP_v_undef_Mask(M, VT, WhichResult));
3187 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
3188 /// the specified operations to build the shuffle.
3189 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
3190 SDValue RHS, SelectionDAG &DAG,
3192 unsigned OpNum = (PFEntry >> 26) & 0x0F;
3193 unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
3194 unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
3197 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
3206 OP_VUZPL, // VUZP, left result
3207 OP_VUZPR, // VUZP, right result
3208 OP_VZIPL, // VZIP, left result
3209 OP_VZIPR, // VZIP, right result
3210 OP_VTRNL, // VTRN, left result
3211 OP_VTRNR // VTRN, right result
3214 if (OpNum == OP_COPY) {
3215 if (LHSID == (1*9+2)*9+3) return LHS;
3216 assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
3220 SDValue OpLHS, OpRHS;
3221 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
3222 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
3223 EVT VT = OpLHS.getValueType();
3226 default: llvm_unreachable("Unknown shuffle opcode!");
3228 return DAG.getNode(ARMISD::VREV64, dl, VT, OpLHS);
3233 return DAG.getNode(ARMISD::VDUPLANE, dl, VT,
3234 OpLHS, DAG.getConstant(OpNum-OP_VDUP0, MVT::i32));
3238 return DAG.getNode(ARMISD::VEXT, dl, VT,
3240 DAG.getConstant(OpNum-OP_VEXT1+1, MVT::i32));
3243 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
3244 OpLHS, OpRHS).getValue(OpNum-OP_VUZPL);
3247 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
3248 OpLHS, OpRHS).getValue(OpNum-OP_VZIPL);
3251 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
3252 OpLHS, OpRHS).getValue(OpNum-OP_VTRNL);
3256 static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
3257 SDValue V1 = Op.getOperand(0);
3258 SDValue V2 = Op.getOperand(1);
3259 DebugLoc dl = Op.getDebugLoc();
3260 EVT VT = Op.getValueType();
3261 ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op.getNode());
3262 SmallVector<int, 8> ShuffleMask;
3264 // Convert shuffles that are directly supported on NEON to target-specific
3265 // DAG nodes, instead of keeping them as shuffles and matching them again
3266 // during code selection. This is more efficient and avoids the possibility
3267 // of inconsistencies between legalization and selection.
3268 // FIXME: floating-point vectors should be canonicalized to integer vectors
3269 // of the same time so that they get CSEd properly.
3270 SVN->getMask(ShuffleMask);
3272 if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0], VT)) {
3273 int Lane = SVN->getSplatIndex();
3274 // If this is undef splat, generate it via "just" vdup, if possible.
3275 if (Lane == -1) Lane = 0;
3277 if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR) {
3278 return DAG.getNode(ARMISD::VDUP, dl, VT, V1.getOperand(0));
3280 return DAG.getNode(ARMISD::VDUPLANE, dl, VT, V1,
3281 DAG.getConstant(Lane, MVT::i32));
3286 if (isVEXTMask(ShuffleMask, VT, ReverseVEXT, Imm)) {
3289 return DAG.getNode(ARMISD::VEXT, dl, VT, V1, V2,
3290 DAG.getConstant(Imm, MVT::i32));
3293 if (isVREVMask(ShuffleMask, VT, 64))
3294 return DAG.getNode(ARMISD::VREV64, dl, VT, V1);
3295 if (isVREVMask(ShuffleMask, VT, 32))
3296 return DAG.getNode(ARMISD::VREV32, dl, VT, V1);
3297 if (isVREVMask(ShuffleMask, VT, 16))
3298 return DAG.getNode(ARMISD::VREV16, dl, VT, V1);
3300 // Check for Neon shuffles that modify both input vectors in place.
3301 // If both results are used, i.e., if there are two shuffles with the same
3302 // source operands and with masks corresponding to both results of one of
3303 // these operations, DAG memoization will ensure that a single node is
3304 // used for both shuffles.
3305 unsigned WhichResult;
3306 if (isVTRNMask(ShuffleMask, VT, WhichResult))
3307 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
3308 V1, V2).getValue(WhichResult);
3309 if (isVUZPMask(ShuffleMask, VT, WhichResult))
3310 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
3311 V1, V2).getValue(WhichResult);
3312 if (isVZIPMask(ShuffleMask, VT, WhichResult))
3313 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
3314 V1, V2).getValue(WhichResult);
3316 if (isVTRN_v_undef_Mask(ShuffleMask, VT, WhichResult))
3317 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
3318 V1, V1).getValue(WhichResult);
3319 if (isVUZP_v_undef_Mask(ShuffleMask, VT, WhichResult))
3320 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
3321 V1, V1).getValue(WhichResult);
3322 if (isVZIP_v_undef_Mask(ShuffleMask, VT, WhichResult))
3323 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
3324 V1, V1).getValue(WhichResult);
3326 // If the shuffle is not directly supported and it has 4 elements, use
3327 // the PerfectShuffle-generated table to synthesize it from other shuffles.
3328 unsigned NumElts = VT.getVectorNumElements();
3330 unsigned PFIndexes[4];
3331 for (unsigned i = 0; i != 4; ++i) {
3332 if (ShuffleMask[i] < 0)
3335 PFIndexes[i] = ShuffleMask[i];
3338 // Compute the index in the perfect shuffle table.
3339 unsigned PFTableIndex =
3340 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
3341 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
3342 unsigned Cost = (PFEntry >> 30);
3345 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
3348 // Implement shuffles with 32- or 64-bit elements as ARMISD::BUILD_VECTORs.
3349 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
3350 if (EltSize >= 32) {
3351 // Do the expansion with floating-point types, since that is what the VFP
3352 // registers are defined to use, and since i64 is not legal.
3353 EVT EltVT = EVT::getFloatingPointVT(EltSize);
3354 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts);
3355 V1 = DAG.getNode(ISD::BIT_CONVERT, dl, VecVT, V1);
3356 V2 = DAG.getNode(ISD::BIT_CONVERT, dl, VecVT, V2);
3357 SmallVector<SDValue, 8> Ops;
3358 for (unsigned i = 0; i < NumElts; ++i) {
3359 if (ShuffleMask[i] < 0)
3360 Ops.push_back(DAG.getUNDEF(EltVT));
3362 Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
3363 ShuffleMask[i] < (int)NumElts ? V1 : V2,
3364 DAG.getConstant(ShuffleMask[i] & (NumElts-1),
3367 SDValue Val = DAG.getNode(ARMISD::BUILD_VECTOR, dl, VecVT, &Ops[0],NumElts);
3368 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Val);
3374 static SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) {
3375 EVT VT = Op.getValueType();
3376 DebugLoc dl = Op.getDebugLoc();
3377 SDValue Vec = Op.getOperand(0);
3378 SDValue Lane = Op.getOperand(1);
3379 assert(VT == MVT::i32 &&
3380 Vec.getValueType().getVectorElementType().getSizeInBits() < 32 &&
3381 "unexpected type for custom-lowering vector extract");
3382 return DAG.getNode(ARMISD::VGETLANEu, dl, MVT::i32, Vec, Lane);
3385 static SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
3386 // The only time a CONCAT_VECTORS operation can have legal types is when
3387 // two 64-bit vectors are concatenated to a 128-bit vector.
3388 assert(Op.getValueType().is128BitVector() && Op.getNumOperands() == 2 &&
3389 "unexpected CONCAT_VECTORS");
3390 DebugLoc dl = Op.getDebugLoc();
3391 SDValue Val = DAG.getUNDEF(MVT::v2f64);
3392 SDValue Op0 = Op.getOperand(0);
3393 SDValue Op1 = Op.getOperand(1);
3394 if (Op0.getOpcode() != ISD::UNDEF)
3395 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
3396 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op0),
3397 DAG.getIntPtrConstant(0));
3398 if (Op1.getOpcode() != ISD::UNDEF)
3399 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
3400 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op1),
3401 DAG.getIntPtrConstant(1));
3402 return DAG.getNode(ISD::BIT_CONVERT, dl, Op.getValueType(), Val);
3405 SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
3406 switch (Op.getOpcode()) {
3407 default: llvm_unreachable("Don't know how to custom lower this!");
3408 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
3409 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
3410 case ISD::GlobalAddress:
3411 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
3412 LowerGlobalAddressELF(Op, DAG);
3413 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
3414 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
3415 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
3416 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
3417 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
3418 case ISD::VASTART: return LowerVASTART(Op, DAG);
3419 case ISD::MEMBARRIER: return LowerMEMBARRIER(Op, DAG, Subtarget);
3420 case ISD::SINT_TO_FP:
3421 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
3422 case ISD::FP_TO_SINT:
3423 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
3424 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
3425 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
3426 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
3427 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
3428 case ISD::EH_SJLJ_SETJMP: return LowerEH_SJLJ_SETJMP(Op, DAG);
3429 case ISD::EH_SJLJ_LONGJMP: return LowerEH_SJLJ_LONGJMP(Op, DAG);
3430 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG,
3432 case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(Op.getNode(), DAG);
3435 case ISD::SRA: return LowerShift(Op.getNode(), DAG, Subtarget);
3436 case ISD::SHL_PARTS: return LowerShiftLeftParts(Op, DAG);
3437 case ISD::SRL_PARTS:
3438 case ISD::SRA_PARTS: return LowerShiftRightParts(Op, DAG);
3439 case ISD::CTTZ: return LowerCTTZ(Op.getNode(), DAG, Subtarget);
3440 case ISD::VSETCC: return LowerVSETCC(Op, DAG);
3441 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
3442 case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
3443 case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
3444 case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
3449 /// ReplaceNodeResults - Replace the results of node with an illegal result
3450 /// type with new values built out of custom code.
3451 void ARMTargetLowering::ReplaceNodeResults(SDNode *N,
3452 SmallVectorImpl<SDValue>&Results,
3453 SelectionDAG &DAG) const {
3455 switch (N->getOpcode()) {
3457 llvm_unreachable("Don't know how to custom expand this!");
3459 case ISD::BIT_CONVERT:
3460 Res = ExpandBIT_CONVERT(N, DAG);
3464 Res = LowerShift(N, DAG, Subtarget);
3468 Results.push_back(Res);
3471 //===----------------------------------------------------------------------===//
3472 // ARM Scheduler Hooks
3473 //===----------------------------------------------------------------------===//
3476 ARMTargetLowering::EmitAtomicCmpSwap(MachineInstr *MI,
3477 MachineBasicBlock *BB,
3478 unsigned Size) const {
3479 unsigned dest = MI->getOperand(0).getReg();
3480 unsigned ptr = MI->getOperand(1).getReg();
3481 unsigned oldval = MI->getOperand(2).getReg();
3482 unsigned newval = MI->getOperand(3).getReg();
3483 unsigned scratch = BB->getParent()->getRegInfo()
3484 .createVirtualRegister(ARM::GPRRegisterClass);
3485 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3486 DebugLoc dl = MI->getDebugLoc();
3487 bool isThumb2 = Subtarget->isThumb2();
3489 unsigned ldrOpc, strOpc;
3491 default: llvm_unreachable("unsupported size for AtomicCmpSwap!");
3493 ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB;
3494 strOpc = isThumb2 ? ARM::t2LDREXB : ARM::STREXB;
3497 ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH;
3498 strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH;
3501 ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX;
3502 strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX;
3506 MachineFunction *MF = BB->getParent();
3507 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3508 MachineFunction::iterator It = BB;
3509 ++It; // insert the new blocks after the current block
3511 MachineBasicBlock *loop1MBB = MF->CreateMachineBasicBlock(LLVM_BB);
3512 MachineBasicBlock *loop2MBB = MF->CreateMachineBasicBlock(LLVM_BB);
3513 MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
3514 MF->insert(It, loop1MBB);
3515 MF->insert(It, loop2MBB);
3516 MF->insert(It, exitMBB);
3517 exitMBB->transferSuccessors(BB);
3521 // fallthrough --> loop1MBB
3522 BB->addSuccessor(loop1MBB);
3525 // ldrex dest, [ptr]
3529 AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr));
3530 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPrr : ARM::CMPrr))
3531 .addReg(dest).addReg(oldval));
3532 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
3533 .addMBB(exitMBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
3534 BB->addSuccessor(loop2MBB);
3535 BB->addSuccessor(exitMBB);
3538 // strex scratch, newval, [ptr]
3542 AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(newval)
3544 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
3545 .addReg(scratch).addImm(0));
3546 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
3547 .addMBB(loop1MBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
3548 BB->addSuccessor(loop1MBB);
3549 BB->addSuccessor(exitMBB);
3555 MF->DeleteMachineInstr(MI); // The instruction is gone now.
3561 ARMTargetLowering::EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
3562 unsigned Size, unsigned BinOpcode) const {
3563 // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
3564 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3566 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3567 MachineFunction *MF = BB->getParent();
3568 MachineFunction::iterator It = BB;
3571 unsigned dest = MI->getOperand(0).getReg();
3572 unsigned ptr = MI->getOperand(1).getReg();
3573 unsigned incr = MI->getOperand(2).getReg();
3574 DebugLoc dl = MI->getDebugLoc();
3576 bool isThumb2 = Subtarget->isThumb2();
3577 unsigned ldrOpc, strOpc;
3579 default: llvm_unreachable("unsupported size for AtomicCmpSwap!");
3581 ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB;
3582 strOpc = isThumb2 ? ARM::t2STREXB : ARM::STREXB;
3585 ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH;
3586 strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH;
3589 ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX;
3590 strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX;
3594 MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB);
3595 MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
3596 MF->insert(It, loopMBB);
3597 MF->insert(It, exitMBB);
3598 exitMBB->transferSuccessors(BB);
3600 MachineRegisterInfo &RegInfo = MF->getRegInfo();
3601 unsigned scratch = RegInfo.createVirtualRegister(ARM::GPRRegisterClass);
3602 unsigned scratch2 = (!BinOpcode) ? incr :
3603 RegInfo.createVirtualRegister(ARM::GPRRegisterClass);
3607 // fallthrough --> loopMBB
3608 BB->addSuccessor(loopMBB);
3612 // <binop> scratch2, dest, incr
3613 // strex scratch, scratch2, ptr
3616 // fallthrough --> exitMBB
3618 AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr));
3620 // operand order needs to go the other way for NAND
3621 if (BinOpcode == ARM::BICrr || BinOpcode == ARM::t2BICrr)
3622 AddDefaultPred(BuildMI(BB, dl, TII->get(BinOpcode), scratch2).
3623 addReg(incr).addReg(dest)).addReg(0);
3625 AddDefaultPred(BuildMI(BB, dl, TII->get(BinOpcode), scratch2).
3626 addReg(dest).addReg(incr)).addReg(0);
3629 AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(scratch2)
3631 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
3632 .addReg(scratch).addImm(0));
3633 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
3634 .addMBB(loopMBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
3636 BB->addSuccessor(loopMBB);
3637 BB->addSuccessor(exitMBB);
3643 MF->DeleteMachineInstr(MI); // The instruction is gone now.
3649 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
3650 MachineBasicBlock *BB) const {
3651 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3652 DebugLoc dl = MI->getDebugLoc();
3653 bool isThumb2 = Subtarget->isThumb2();
3654 switch (MI->getOpcode()) {
3657 llvm_unreachable("Unexpected instr type to insert");
3659 case ARM::ATOMIC_LOAD_ADD_I8:
3660 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
3661 case ARM::ATOMIC_LOAD_ADD_I16:
3662 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
3663 case ARM::ATOMIC_LOAD_ADD_I32:
3664 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
3666 case ARM::ATOMIC_LOAD_AND_I8:
3667 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
3668 case ARM::ATOMIC_LOAD_AND_I16:
3669 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
3670 case ARM::ATOMIC_LOAD_AND_I32:
3671 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
3673 case ARM::ATOMIC_LOAD_OR_I8:
3674 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
3675 case ARM::ATOMIC_LOAD_OR_I16:
3676 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
3677 case ARM::ATOMIC_LOAD_OR_I32:
3678 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
3680 case ARM::ATOMIC_LOAD_XOR_I8:
3681 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
3682 case ARM::ATOMIC_LOAD_XOR_I16:
3683 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
3684 case ARM::ATOMIC_LOAD_XOR_I32:
3685 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
3687 case ARM::ATOMIC_LOAD_NAND_I8:
3688 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
3689 case ARM::ATOMIC_LOAD_NAND_I16:
3690 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
3691 case ARM::ATOMIC_LOAD_NAND_I32:
3692 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
3694 case ARM::ATOMIC_LOAD_SUB_I8:
3695 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
3696 case ARM::ATOMIC_LOAD_SUB_I16:
3697 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
3698 case ARM::ATOMIC_LOAD_SUB_I32:
3699 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
3701 case ARM::ATOMIC_SWAP_I8: return EmitAtomicBinary(MI, BB, 1, 0);
3702 case ARM::ATOMIC_SWAP_I16: return EmitAtomicBinary(MI, BB, 2, 0);
3703 case ARM::ATOMIC_SWAP_I32: return EmitAtomicBinary(MI, BB, 4, 0);
3705 case ARM::ATOMIC_CMP_SWAP_I8: return EmitAtomicCmpSwap(MI, BB, 1);
3706 case ARM::ATOMIC_CMP_SWAP_I16: return EmitAtomicCmpSwap(MI, BB, 2);
3707 case ARM::ATOMIC_CMP_SWAP_I32: return EmitAtomicCmpSwap(MI, BB, 4);
3709 case ARM::tMOVCCr_pseudo: {
3710 // To "insert" a SELECT_CC instruction, we actually have to insert the
3711 // diamond control-flow pattern. The incoming instruction knows the
3712 // destination vreg to set, the condition code register to branch on, the
3713 // true/false values to select between, and a branch opcode to use.
3714 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3715 MachineFunction::iterator It = BB;
3721 // cmpTY ccX, r1, r2
3723 // fallthrough --> copy0MBB
3724 MachineBasicBlock *thisMBB = BB;
3725 MachineFunction *F = BB->getParent();
3726 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
3727 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
3728 BuildMI(BB, dl, TII->get(ARM::tBcc)).addMBB(sinkMBB)
3729 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
3730 F->insert(It, copy0MBB);
3731 F->insert(It, sinkMBB);
3732 // Update machine-CFG edges by first adding all successors of the current
3733 // block to the new block which will contain the Phi node for the select.
3734 for (MachineBasicBlock::succ_iterator I = BB->succ_begin(),
3735 E = BB->succ_end(); I != E; ++I)
3736 sinkMBB->addSuccessor(*I);
3737 // Next, remove all successors of the current block, and add the true
3738 // and fallthrough blocks as its successors.
3739 while (!BB->succ_empty())
3740 BB->removeSuccessor(BB->succ_begin());
3741 BB->addSuccessor(copy0MBB);
3742 BB->addSuccessor(sinkMBB);
3745 // %FalseValue = ...
3746 // # fallthrough to sinkMBB
3749 // Update machine-CFG edges
3750 BB->addSuccessor(sinkMBB);
3753 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
3756 BuildMI(BB, dl, TII->get(ARM::PHI), MI->getOperand(0).getReg())
3757 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
3758 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
3760 F->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
3767 case ARM::t2SUBrSPi_:
3768 case ARM::t2SUBrSPi12_:
3769 case ARM::t2SUBrSPs_: {
3770 MachineFunction *MF = BB->getParent();
3771 unsigned DstReg = MI->getOperand(0).getReg();
3772 unsigned SrcReg = MI->getOperand(1).getReg();
3773 bool DstIsDead = MI->getOperand(0).isDead();
3774 bool SrcIsKill = MI->getOperand(1).isKill();
3776 if (SrcReg != ARM::SP) {
3777 // Copy the source to SP from virtual register.
3778 const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(SrcReg);
3779 unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
3780 ? ARM::tMOVtgpr2gpr : ARM::tMOVgpr2gpr;
3781 BuildMI(BB, dl, TII->get(CopyOpc), ARM::SP)
3782 .addReg(SrcReg, getKillRegState(SrcIsKill));
3786 bool NeedPred = false, NeedCC = false, NeedOp3 = false;
3787 switch (MI->getOpcode()) {
3789 llvm_unreachable("Unexpected pseudo instruction!");
3795 OpOpc = ARM::tADDspr;
3798 OpOpc = ARM::tSUBspi;
3800 case ARM::t2SUBrSPi_:
3801 OpOpc = ARM::t2SUBrSPi;
3802 NeedPred = true; NeedCC = true;
3804 case ARM::t2SUBrSPi12_:
3805 OpOpc = ARM::t2SUBrSPi12;
3808 case ARM::t2SUBrSPs_:
3809 OpOpc = ARM::t2SUBrSPs;
3810 NeedPred = true; NeedCC = true; NeedOp3 = true;
3813 MachineInstrBuilder MIB = BuildMI(BB, dl, TII->get(OpOpc), ARM::SP);
3814 if (OpOpc == ARM::tAND)
3815 AddDefaultT1CC(MIB);
3816 MIB.addReg(ARM::SP);
3817 MIB.addOperand(MI->getOperand(2));
3819 MIB.addOperand(MI->getOperand(3));
3821 AddDefaultPred(MIB);
3825 // Copy the result from SP to virtual register.
3826 const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(DstReg);
3827 unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
3828 ? ARM::tMOVgpr2tgpr : ARM::tMOVgpr2gpr;
3829 BuildMI(BB, dl, TII->get(CopyOpc))
3830 .addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead))
3832 MF->DeleteMachineInstr(MI); // The pseudo instruction is gone now.
3838 //===----------------------------------------------------------------------===//
3839 // ARM Optimization Hooks
3840 //===----------------------------------------------------------------------===//
3843 SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp,
3844 TargetLowering::DAGCombinerInfo &DCI) {
3845 SelectionDAG &DAG = DCI.DAG;
3846 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3847 EVT VT = N->getValueType(0);
3848 unsigned Opc = N->getOpcode();
3849 bool isSlctCC = Slct.getOpcode() == ISD::SELECT_CC;
3850 SDValue LHS = isSlctCC ? Slct.getOperand(2) : Slct.getOperand(1);
3851 SDValue RHS = isSlctCC ? Slct.getOperand(3) : Slct.getOperand(2);
3852 ISD::CondCode CC = ISD::SETCC_INVALID;
3855 CC = cast<CondCodeSDNode>(Slct.getOperand(4))->get();
3857 SDValue CCOp = Slct.getOperand(0);
3858 if (CCOp.getOpcode() == ISD::SETCC)
3859 CC = cast<CondCodeSDNode>(CCOp.getOperand(2))->get();
3862 bool DoXform = false;
3864 assert ((Opc == ISD::ADD || (Opc == ISD::SUB && Slct == N->getOperand(1))) &&
3867 if (LHS.getOpcode() == ISD::Constant &&
3868 cast<ConstantSDNode>(LHS)->isNullValue()) {
3870 } else if (CC != ISD::SETCC_INVALID &&
3871 RHS.getOpcode() == ISD::Constant &&
3872 cast<ConstantSDNode>(RHS)->isNullValue()) {
3873 std::swap(LHS, RHS);
3874 SDValue Op0 = Slct.getOperand(0);
3875 EVT OpVT = isSlctCC ? Op0.getValueType() :
3876 Op0.getOperand(0).getValueType();
3877 bool isInt = OpVT.isInteger();
3878 CC = ISD::getSetCCInverse(CC, isInt);
3880 if (!TLI.isCondCodeLegal(CC, OpVT))
3881 return SDValue(); // Inverse operator isn't legal.
3888 SDValue Result = DAG.getNode(Opc, RHS.getDebugLoc(), VT, OtherOp, RHS);
3890 return DAG.getSelectCC(N->getDebugLoc(), OtherOp, Result,
3891 Slct.getOperand(0), Slct.getOperand(1), CC);
3892 SDValue CCOp = Slct.getOperand(0);
3894 CCOp = DAG.getSetCC(Slct.getDebugLoc(), CCOp.getValueType(),
3895 CCOp.getOperand(0), CCOp.getOperand(1), CC);
3896 return DAG.getNode(ISD::SELECT, N->getDebugLoc(), VT,
3897 CCOp, OtherOp, Result);
3902 /// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
3903 static SDValue PerformADDCombine(SDNode *N,
3904 TargetLowering::DAGCombinerInfo &DCI) {
3905 // added by evan in r37685 with no testcase.
3906 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
3908 // fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
3909 if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
3910 SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
3911 if (Result.getNode()) return Result;
3913 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
3914 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
3915 if (Result.getNode()) return Result;
3921 /// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
3922 static SDValue PerformSUBCombine(SDNode *N,
3923 TargetLowering::DAGCombinerInfo &DCI) {
3924 // added by evan in r37685 with no testcase.
3925 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
3927 // fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
3928 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
3929 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
3930 if (Result.getNode()) return Result;
3936 static SDValue PerformMULCombine(SDNode *N,
3937 TargetLowering::DAGCombinerInfo &DCI,
3938 const ARMSubtarget *Subtarget) {
3939 SelectionDAG &DAG = DCI.DAG;
3941 if (Subtarget->isThumb1Only())
3944 if (DAG.getMachineFunction().
3945 getFunction()->hasFnAttr(Attribute::OptimizeForSize))
3948 if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer())
3951 EVT VT = N->getValueType(0);
3955 ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1));
3959 uint64_t MulAmt = C->getZExtValue();
3960 unsigned ShiftAmt = CountTrailingZeros_64(MulAmt);
3961 ShiftAmt = ShiftAmt & (32 - 1);
3962 SDValue V = N->getOperand(0);
3963 DebugLoc DL = N->getDebugLoc();
3966 MulAmt >>= ShiftAmt;
3967 if (isPowerOf2_32(MulAmt - 1)) {
3968 // (mul x, 2^N + 1) => (add (shl x, N), x)
3969 Res = DAG.getNode(ISD::ADD, DL, VT,
3970 V, DAG.getNode(ISD::SHL, DL, VT,
3971 V, DAG.getConstant(Log2_32(MulAmt-1),
3973 } else if (isPowerOf2_32(MulAmt + 1)) {
3974 // (mul x, 2^N - 1) => (sub (shl x, N), x)
3975 Res = DAG.getNode(ISD::SUB, DL, VT,
3976 DAG.getNode(ISD::SHL, DL, VT,
3977 V, DAG.getConstant(Log2_32(MulAmt+1),
3984 Res = DAG.getNode(ISD::SHL, DL, VT, Res,
3985 DAG.getConstant(ShiftAmt, MVT::i32));
3987 // Do not add new nodes to DAG combiner worklist.
3988 DCI.CombineTo(N, Res, false);
3992 /// PerformVMOVRRDCombine - Target-specific dag combine xforms for
3993 /// ARMISD::VMOVRRD.
3994 static SDValue PerformVMOVRRDCombine(SDNode *N,
3995 TargetLowering::DAGCombinerInfo &DCI) {
3996 // fmrrd(fmdrr x, y) -> x,y
3997 SDValue InDouble = N->getOperand(0);
3998 if (InDouble.getOpcode() == ARMISD::VMOVDRR)
3999 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
4003 /// getVShiftImm - Check if this is a valid build_vector for the immediate
4004 /// operand of a vector shift operation, where all the elements of the
4005 /// build_vector must have the same constant integer value.
4006 static bool getVShiftImm(SDValue Op, unsigned ElementBits, int64_t &Cnt) {
4007 // Ignore bit_converts.
4008 while (Op.getOpcode() == ISD::BIT_CONVERT)
4009 Op = Op.getOperand(0);
4010 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
4011 APInt SplatBits, SplatUndef;
4012 unsigned SplatBitSize;
4014 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
4015 HasAnyUndefs, ElementBits) ||
4016 SplatBitSize > ElementBits)
4018 Cnt = SplatBits.getSExtValue();
4022 /// isVShiftLImm - Check if this is a valid build_vector for the immediate
4023 /// operand of a vector shift left operation. That value must be in the range:
4024 /// 0 <= Value < ElementBits for a left shift; or
4025 /// 0 <= Value <= ElementBits for a long left shift.
4026 static bool isVShiftLImm(SDValue Op, EVT VT, bool isLong, int64_t &Cnt) {
4027 assert(VT.isVector() && "vector shift count is not a vector type");
4028 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
4029 if (! getVShiftImm(Op, ElementBits, Cnt))
4031 return (Cnt >= 0 && (isLong ? Cnt-1 : Cnt) < ElementBits);
4034 /// isVShiftRImm - Check if this is a valid build_vector for the immediate
4035 /// operand of a vector shift right operation. For a shift opcode, the value
4036 /// is positive, but for an intrinsic the value count must be negative. The
4037 /// absolute value must be in the range:
4038 /// 1 <= |Value| <= ElementBits for a right shift; or
4039 /// 1 <= |Value| <= ElementBits/2 for a narrow right shift.
4040 static bool isVShiftRImm(SDValue Op, EVT VT, bool isNarrow, bool isIntrinsic,
4042 assert(VT.isVector() && "vector shift count is not a vector type");
4043 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
4044 if (! getVShiftImm(Op, ElementBits, Cnt))
4048 return (Cnt >= 1 && Cnt <= (isNarrow ? ElementBits/2 : ElementBits));
4051 /// PerformIntrinsicCombine - ARM-specific DAG combining for intrinsics.
4052 static SDValue PerformIntrinsicCombine(SDNode *N, SelectionDAG &DAG) {
4053 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
4056 // Don't do anything for most intrinsics.
4059 // Vector shifts: check for immediate versions and lower them.
4060 // Note: This is done during DAG combining instead of DAG legalizing because
4061 // the build_vectors for 64-bit vector element shift counts are generally
4062 // not legal, and it is hard to see their values after they get legalized to
4063 // loads from a constant pool.
4064 case Intrinsic::arm_neon_vshifts:
4065 case Intrinsic::arm_neon_vshiftu:
4066 case Intrinsic::arm_neon_vshiftls:
4067 case Intrinsic::arm_neon_vshiftlu:
4068 case Intrinsic::arm_neon_vshiftn:
4069 case Intrinsic::arm_neon_vrshifts:
4070 case Intrinsic::arm_neon_vrshiftu:
4071 case Intrinsic::arm_neon_vrshiftn:
4072 case Intrinsic::arm_neon_vqshifts:
4073 case Intrinsic::arm_neon_vqshiftu:
4074 case Intrinsic::arm_neon_vqshiftsu:
4075 case Intrinsic::arm_neon_vqshiftns:
4076 case Intrinsic::arm_neon_vqshiftnu:
4077 case Intrinsic::arm_neon_vqshiftnsu:
4078 case Intrinsic::arm_neon_vqrshiftns:
4079 case Intrinsic::arm_neon_vqrshiftnu:
4080 case Intrinsic::arm_neon_vqrshiftnsu: {
4081 EVT VT = N->getOperand(1).getValueType();
4083 unsigned VShiftOpc = 0;
4086 case Intrinsic::arm_neon_vshifts:
4087 case Intrinsic::arm_neon_vshiftu:
4088 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt)) {
4089 VShiftOpc = ARMISD::VSHL;
4092 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt)) {
4093 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshifts ?
4094 ARMISD::VSHRs : ARMISD::VSHRu);
4099 case Intrinsic::arm_neon_vshiftls:
4100 case Intrinsic::arm_neon_vshiftlu:
4101 if (isVShiftLImm(N->getOperand(2), VT, true, Cnt))
4103 llvm_unreachable("invalid shift count for vshll intrinsic");
4105 case Intrinsic::arm_neon_vrshifts:
4106 case Intrinsic::arm_neon_vrshiftu:
4107 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt))
4111 case Intrinsic::arm_neon_vqshifts:
4112 case Intrinsic::arm_neon_vqshiftu:
4113 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
4117 case Intrinsic::arm_neon_vqshiftsu:
4118 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
4120 llvm_unreachable("invalid shift count for vqshlu intrinsic");
4122 case Intrinsic::arm_neon_vshiftn:
4123 case Intrinsic::arm_neon_vrshiftn:
4124 case Intrinsic::arm_neon_vqshiftns:
4125 case Intrinsic::arm_neon_vqshiftnu:
4126 case Intrinsic::arm_neon_vqshiftnsu:
4127 case Intrinsic::arm_neon_vqrshiftns:
4128 case Intrinsic::arm_neon_vqrshiftnu:
4129 case Intrinsic::arm_neon_vqrshiftnsu:
4130 // Narrowing shifts require an immediate right shift.
4131 if (isVShiftRImm(N->getOperand(2), VT, true, true, Cnt))
4133 llvm_unreachable("invalid shift count for narrowing vector shift "
4137 llvm_unreachable("unhandled vector shift");
4141 case Intrinsic::arm_neon_vshifts:
4142 case Intrinsic::arm_neon_vshiftu:
4143 // Opcode already set above.
4145 case Intrinsic::arm_neon_vshiftls:
4146 case Intrinsic::arm_neon_vshiftlu:
4147 if (Cnt == VT.getVectorElementType().getSizeInBits())
4148 VShiftOpc = ARMISD::VSHLLi;
4150 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshiftls ?
4151 ARMISD::VSHLLs : ARMISD::VSHLLu);
4153 case Intrinsic::arm_neon_vshiftn:
4154 VShiftOpc = ARMISD::VSHRN; break;
4155 case Intrinsic::arm_neon_vrshifts:
4156 VShiftOpc = ARMISD::VRSHRs; break;
4157 case Intrinsic::arm_neon_vrshiftu:
4158 VShiftOpc = ARMISD::VRSHRu; break;
4159 case Intrinsic::arm_neon_vrshiftn:
4160 VShiftOpc = ARMISD::VRSHRN; break;
4161 case Intrinsic::arm_neon_vqshifts:
4162 VShiftOpc = ARMISD::VQSHLs; break;
4163 case Intrinsic::arm_neon_vqshiftu:
4164 VShiftOpc = ARMISD::VQSHLu; break;
4165 case Intrinsic::arm_neon_vqshiftsu:
4166 VShiftOpc = ARMISD::VQSHLsu; break;
4167 case Intrinsic::arm_neon_vqshiftns:
4168 VShiftOpc = ARMISD::VQSHRNs; break;
4169 case Intrinsic::arm_neon_vqshiftnu:
4170 VShiftOpc = ARMISD::VQSHRNu; break;
4171 case Intrinsic::arm_neon_vqshiftnsu:
4172 VShiftOpc = ARMISD::VQSHRNsu; break;
4173 case Intrinsic::arm_neon_vqrshiftns:
4174 VShiftOpc = ARMISD::VQRSHRNs; break;
4175 case Intrinsic::arm_neon_vqrshiftnu:
4176 VShiftOpc = ARMISD::VQRSHRNu; break;
4177 case Intrinsic::arm_neon_vqrshiftnsu:
4178 VShiftOpc = ARMISD::VQRSHRNsu; break;
4181 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
4182 N->getOperand(1), DAG.getConstant(Cnt, MVT::i32));
4185 case Intrinsic::arm_neon_vshiftins: {
4186 EVT VT = N->getOperand(1).getValueType();
4188 unsigned VShiftOpc = 0;
4190 if (isVShiftLImm(N->getOperand(3), VT, false, Cnt))
4191 VShiftOpc = ARMISD::VSLI;
4192 else if (isVShiftRImm(N->getOperand(3), VT, false, true, Cnt))
4193 VShiftOpc = ARMISD::VSRI;
4195 llvm_unreachable("invalid shift count for vsli/vsri intrinsic");
4198 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
4199 N->getOperand(1), N->getOperand(2),
4200 DAG.getConstant(Cnt, MVT::i32));
4203 case Intrinsic::arm_neon_vqrshifts:
4204 case Intrinsic::arm_neon_vqrshiftu:
4205 // No immediate versions of these to check for.
4212 /// PerformShiftCombine - Checks for immediate versions of vector shifts and
4213 /// lowers them. As with the vector shift intrinsics, this is done during DAG
4214 /// combining instead of DAG legalizing because the build_vectors for 64-bit
4215 /// vector element shift counts are generally not legal, and it is hard to see
4216 /// their values after they get legalized to loads from a constant pool.
4217 static SDValue PerformShiftCombine(SDNode *N, SelectionDAG &DAG,
4218 const ARMSubtarget *ST) {
4219 EVT VT = N->getValueType(0);
4221 // Nothing to be done for scalar shifts.
4222 if (! VT.isVector())
4225 assert(ST->hasNEON() && "unexpected vector shift");
4228 switch (N->getOpcode()) {
4229 default: llvm_unreachable("unexpected shift opcode");
4232 if (isVShiftLImm(N->getOperand(1), VT, false, Cnt))
4233 return DAG.getNode(ARMISD::VSHL, N->getDebugLoc(), VT, N->getOperand(0),
4234 DAG.getConstant(Cnt, MVT::i32));
4239 if (isVShiftRImm(N->getOperand(1), VT, false, false, Cnt)) {
4240 unsigned VShiftOpc = (N->getOpcode() == ISD::SRA ?
4241 ARMISD::VSHRs : ARMISD::VSHRu);
4242 return DAG.getNode(VShiftOpc, N->getDebugLoc(), VT, N->getOperand(0),
4243 DAG.getConstant(Cnt, MVT::i32));
4249 /// PerformExtendCombine - Target-specific DAG combining for ISD::SIGN_EXTEND,
4250 /// ISD::ZERO_EXTEND, and ISD::ANY_EXTEND.
4251 static SDValue PerformExtendCombine(SDNode *N, SelectionDAG &DAG,
4252 const ARMSubtarget *ST) {
4253 SDValue N0 = N->getOperand(0);
4255 // Check for sign- and zero-extensions of vector extract operations of 8-
4256 // and 16-bit vector elements. NEON supports these directly. They are
4257 // handled during DAG combining because type legalization will promote them
4258 // to 32-bit types and it is messy to recognize the operations after that.
4259 if (ST->hasNEON() && N0.getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
4260 SDValue Vec = N0.getOperand(0);
4261 SDValue Lane = N0.getOperand(1);
4262 EVT VT = N->getValueType(0);
4263 EVT EltVT = N0.getValueType();
4264 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4266 if (VT == MVT::i32 &&
4267 (EltVT == MVT::i8 || EltVT == MVT::i16) &&
4268 TLI.isTypeLegal(Vec.getValueType())) {
4271 switch (N->getOpcode()) {
4272 default: llvm_unreachable("unexpected opcode");
4273 case ISD::SIGN_EXTEND:
4274 Opc = ARMISD::VGETLANEs;
4276 case ISD::ZERO_EXTEND:
4277 case ISD::ANY_EXTEND:
4278 Opc = ARMISD::VGETLANEu;
4281 return DAG.getNode(Opc, N->getDebugLoc(), VT, Vec, Lane);
4288 /// PerformSELECT_CCCombine - Target-specific DAG combining for ISD::SELECT_CC
4289 /// to match f32 max/min patterns to use NEON vmax/vmin instructions.
4290 static SDValue PerformSELECT_CCCombine(SDNode *N, SelectionDAG &DAG,
4291 const ARMSubtarget *ST) {
4292 // If the target supports NEON, try to use vmax/vmin instructions for f32
4293 // selects like "x < y ? x : y". Unless the FiniteOnlyFPMath option is set,
4294 // be careful about NaNs: NEON's vmax/vmin return NaN if either operand is
4295 // a NaN; only do the transformation when it matches that behavior.
4297 // For now only do this when using NEON for FP operations; if using VFP, it
4298 // is not obvious that the benefit outweighs the cost of switching to the
4300 if (!ST->hasNEON() || !ST->useNEONForSinglePrecisionFP() ||
4301 N->getValueType(0) != MVT::f32)
4304 SDValue CondLHS = N->getOperand(0);
4305 SDValue CondRHS = N->getOperand(1);
4306 SDValue LHS = N->getOperand(2);
4307 SDValue RHS = N->getOperand(3);
4308 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
4310 unsigned Opcode = 0;
4312 if (DAG.isEqualTo(LHS, CondLHS) && DAG.isEqualTo(RHS, CondRHS)) {
4313 IsReversed = false; // x CC y ? x : y
4314 } else if (DAG.isEqualTo(LHS, CondRHS) && DAG.isEqualTo(RHS, CondLHS)) {
4315 IsReversed = true ; // x CC y ? y : x
4329 // If LHS is NaN, an ordered comparison will be false and the result will
4330 // be the RHS, but vmin(NaN, RHS) = NaN. Avoid this by checking that LHS
4331 // != NaN. Likewise, for unordered comparisons, check for RHS != NaN.
4332 IsUnordered = (CC == ISD::SETULT || CC == ISD::SETULE);
4333 if (!DAG.isKnownNeverNaN(IsUnordered ? RHS : LHS))
4335 // For less-than-or-equal comparisons, "+0 <= -0" will be true but vmin
4336 // will return -0, so vmin can only be used for unsafe math or if one of
4337 // the operands is known to be nonzero.
4338 if ((CC == ISD::SETLE || CC == ISD::SETOLE || CC == ISD::SETULE) &&
4340 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
4342 Opcode = IsReversed ? ARMISD::FMAX : ARMISD::FMIN;
4351 // If LHS is NaN, an ordered comparison will be false and the result will
4352 // be the RHS, but vmax(NaN, RHS) = NaN. Avoid this by checking that LHS
4353 // != NaN. Likewise, for unordered comparisons, check for RHS != NaN.
4354 IsUnordered = (CC == ISD::SETUGT || CC == ISD::SETUGE);
4355 if (!DAG.isKnownNeverNaN(IsUnordered ? RHS : LHS))
4357 // For greater-than-or-equal comparisons, "-0 >= +0" will be true but vmax
4358 // will return +0, so vmax can only be used for unsafe math or if one of
4359 // the operands is known to be nonzero.
4360 if ((CC == ISD::SETGE || CC == ISD::SETOGE || CC == ISD::SETUGE) &&
4362 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
4364 Opcode = IsReversed ? ARMISD::FMIN : ARMISD::FMAX;
4370 return DAG.getNode(Opcode, N->getDebugLoc(), N->getValueType(0), LHS, RHS);
4373 SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N,
4374 DAGCombinerInfo &DCI) const {
4375 switch (N->getOpcode()) {
4377 case ISD::ADD: return PerformADDCombine(N, DCI);
4378 case ISD::SUB: return PerformSUBCombine(N, DCI);
4379 case ISD::MUL: return PerformMULCombine(N, DCI, Subtarget);
4380 case ARMISD::VMOVRRD: return PerformVMOVRRDCombine(N, DCI);
4381 case ISD::INTRINSIC_WO_CHAIN: return PerformIntrinsicCombine(N, DCI.DAG);
4384 case ISD::SRL: return PerformShiftCombine(N, DCI.DAG, Subtarget);
4385 case ISD::SIGN_EXTEND:
4386 case ISD::ZERO_EXTEND:
4387 case ISD::ANY_EXTEND: return PerformExtendCombine(N, DCI.DAG, Subtarget);
4388 case ISD::SELECT_CC: return PerformSELECT_CCCombine(N, DCI.DAG, Subtarget);
4393 bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
4394 if (!Subtarget->hasV6Ops())
4395 // Pre-v6 does not support unaligned mem access.
4398 // v6+ may or may not support unaligned mem access depending on the system
4400 // FIXME: This is pretty conservative. Should we provide cmdline option to
4401 // control the behaviour?
4402 if (!Subtarget->isTargetDarwin())
4406 switch (VT.getSimpleVT().SimpleTy) {
4413 // FIXME: VLD1 etc with standard alignment is legal.
4417 static bool isLegalT1AddressImmediate(int64_t V, EVT VT) {
4422 switch (VT.getSimpleVT().SimpleTy) {
4423 default: return false;
4438 if ((V & (Scale - 1)) != 0)
4441 return V == (V & ((1LL << 5) - 1));
4444 static bool isLegalT2AddressImmediate(int64_t V, EVT VT,
4445 const ARMSubtarget *Subtarget) {
4452 switch (VT.getSimpleVT().SimpleTy) {
4453 default: return false;
4458 // + imm12 or - imm8
4460 return V == (V & ((1LL << 8) - 1));
4461 return V == (V & ((1LL << 12) - 1));
4464 // Same as ARM mode. FIXME: NEON?
4465 if (!Subtarget->hasVFP2())
4470 return V == (V & ((1LL << 8) - 1));
4474 /// isLegalAddressImmediate - Return true if the integer value can be used
4475 /// as the offset of the target addressing mode for load / store of the
4477 static bool isLegalAddressImmediate(int64_t V, EVT VT,
4478 const ARMSubtarget *Subtarget) {
4485 if (Subtarget->isThumb1Only())
4486 return isLegalT1AddressImmediate(V, VT);
4487 else if (Subtarget->isThumb2())
4488 return isLegalT2AddressImmediate(V, VT, Subtarget);
4493 switch (VT.getSimpleVT().SimpleTy) {
4494 default: return false;
4499 return V == (V & ((1LL << 12) - 1));
4502 return V == (V & ((1LL << 8) - 1));
4505 if (!Subtarget->hasVFP2()) // FIXME: NEON?
4510 return V == (V & ((1LL << 8) - 1));
4514 bool ARMTargetLowering::isLegalT2ScaledAddressingMode(const AddrMode &AM,
4516 int Scale = AM.Scale;
4520 switch (VT.getSimpleVT().SimpleTy) {
4521 default: return false;
4530 return Scale == 2 || Scale == 4 || Scale == 8;
4533 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
4537 // Note, we allow "void" uses (basically, uses that aren't loads or
4538 // stores), because arm allows folding a scale into many arithmetic
4539 // operations. This should be made more precise and revisited later.
4541 // Allow r << imm, but the imm has to be a multiple of two.
4542 if (Scale & 1) return false;
4543 return isPowerOf2_32(Scale);
4547 /// isLegalAddressingMode - Return true if the addressing mode represented
4548 /// by AM is legal for this target, for a load/store of the specified type.
4549 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
4550 const Type *Ty) const {
4551 EVT VT = getValueType(Ty, true);
4552 if (!isLegalAddressImmediate(AM.BaseOffs, VT, Subtarget))
4555 // Can never fold addr of global into load/store.
4560 case 0: // no scale reg, must be "r+i" or "r", or "i".
4563 if (Subtarget->isThumb1Only())
4567 // ARM doesn't support any R+R*scale+imm addr modes.
4574 if (Subtarget->isThumb2())
4575 return isLegalT2ScaledAddressingMode(AM, VT);
4577 int Scale = AM.Scale;
4578 switch (VT.getSimpleVT().SimpleTy) {
4579 default: return false;
4583 if (Scale < 0) Scale = -Scale;
4587 return isPowerOf2_32(Scale & ~1);
4591 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
4596 // Note, we allow "void" uses (basically, uses that aren't loads or
4597 // stores), because arm allows folding a scale into many arithmetic
4598 // operations. This should be made more precise and revisited later.
4600 // Allow r << imm, but the imm has to be a multiple of two.
4601 if (Scale & 1) return false;
4602 return isPowerOf2_32(Scale);
4609 /// isLegalICmpImmediate - Return true if the specified immediate is legal
4610 /// icmp immediate, that is the target has icmp instructions which can compare
4611 /// a register against the immediate without having to materialize the
4612 /// immediate into a register.
4613 bool ARMTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
4614 if (!Subtarget->isThumb())
4615 return ARM_AM::getSOImmVal(Imm) != -1;
4616 if (Subtarget->isThumb2())
4617 return ARM_AM::getT2SOImmVal(Imm) != -1;
4618 return Imm >= 0 && Imm <= 255;
4621 static bool getARMIndexedAddressParts(SDNode *Ptr, EVT VT,
4622 bool isSEXTLoad, SDValue &Base,
4623 SDValue &Offset, bool &isInc,
4624 SelectionDAG &DAG) {
4625 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
4628 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
4630 Base = Ptr->getOperand(0);
4631 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
4632 int RHSC = (int)RHS->getZExtValue();
4633 if (RHSC < 0 && RHSC > -256) {
4634 assert(Ptr->getOpcode() == ISD::ADD);
4636 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
4640 isInc = (Ptr->getOpcode() == ISD::ADD);
4641 Offset = Ptr->getOperand(1);
4643 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
4645 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
4646 int RHSC = (int)RHS->getZExtValue();
4647 if (RHSC < 0 && RHSC > -0x1000) {
4648 assert(Ptr->getOpcode() == ISD::ADD);
4650 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
4651 Base = Ptr->getOperand(0);
4656 if (Ptr->getOpcode() == ISD::ADD) {
4658 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
4659 if (ShOpcVal != ARM_AM::no_shift) {
4660 Base = Ptr->getOperand(1);
4661 Offset = Ptr->getOperand(0);
4663 Base = Ptr->getOperand(0);
4664 Offset = Ptr->getOperand(1);
4669 isInc = (Ptr->getOpcode() == ISD::ADD);
4670 Base = Ptr->getOperand(0);
4671 Offset = Ptr->getOperand(1);
4675 // FIXME: Use VLDM / VSTM to emulate indexed FP load / store.
4679 static bool getT2IndexedAddressParts(SDNode *Ptr, EVT VT,
4680 bool isSEXTLoad, SDValue &Base,
4681 SDValue &Offset, bool &isInc,
4682 SelectionDAG &DAG) {
4683 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
4686 Base = Ptr->getOperand(0);
4687 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
4688 int RHSC = (int)RHS->getZExtValue();
4689 if (RHSC < 0 && RHSC > -0x100) { // 8 bits.
4690 assert(Ptr->getOpcode() == ISD::ADD);
4692 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
4694 } else if (RHSC > 0 && RHSC < 0x100) { // 8 bit, no zero.
4695 isInc = Ptr->getOpcode() == ISD::ADD;
4696 Offset = DAG.getConstant(RHSC, RHS->getValueType(0));
4704 /// getPreIndexedAddressParts - returns true by value, base pointer and
4705 /// offset pointer and addressing mode by reference if the node's address
4706 /// can be legally represented as pre-indexed load / store address.
4708 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
4710 ISD::MemIndexedMode &AM,
4711 SelectionDAG &DAG) const {
4712 if (Subtarget->isThumb1Only())
4717 bool isSEXTLoad = false;
4718 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
4719 Ptr = LD->getBasePtr();
4720 VT = LD->getMemoryVT();
4721 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
4722 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
4723 Ptr = ST->getBasePtr();
4724 VT = ST->getMemoryVT();
4729 bool isLegal = false;
4730 if (Subtarget->isThumb2())
4731 isLegal = getT2IndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
4732 Offset, isInc, DAG);
4734 isLegal = getARMIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
4735 Offset, isInc, DAG);
4739 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
4743 /// getPostIndexedAddressParts - returns true by value, base pointer and
4744 /// offset pointer and addressing mode by reference if this node can be
4745 /// combined with a load / store to form a post-indexed load / store.
4746 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
4749 ISD::MemIndexedMode &AM,
4750 SelectionDAG &DAG) const {
4751 if (Subtarget->isThumb1Only())
4756 bool isSEXTLoad = false;
4757 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
4758 VT = LD->getMemoryVT();
4759 Ptr = LD->getBasePtr();
4760 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
4761 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
4762 VT = ST->getMemoryVT();
4763 Ptr = ST->getBasePtr();
4768 bool isLegal = false;
4769 if (Subtarget->isThumb2())
4770 isLegal = getT2IndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
4773 isLegal = getARMIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
4779 // Swap base ptr and offset to catch more post-index load / store when
4780 // it's legal. In Thumb2 mode, offset must be an immediate.
4781 if (Ptr == Offset && Op->getOpcode() == ISD::ADD &&
4782 !Subtarget->isThumb2())
4783 std::swap(Base, Offset);
4785 // Post-indexed load / store update the base pointer.
4790 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
4794 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
4798 const SelectionDAG &DAG,
4799 unsigned Depth) const {
4800 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
4801 switch (Op.getOpcode()) {
4803 case ARMISD::CMOV: {
4804 // Bits are known zero/one if known on the LHS and RHS.
4805 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
4806 if (KnownZero == 0 && KnownOne == 0) return;
4808 APInt KnownZeroRHS, KnownOneRHS;
4809 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
4810 KnownZeroRHS, KnownOneRHS, Depth+1);
4811 KnownZero &= KnownZeroRHS;
4812 KnownOne &= KnownOneRHS;
4818 //===----------------------------------------------------------------------===//
4819 // ARM Inline Assembly Support
4820 //===----------------------------------------------------------------------===//
4822 /// getConstraintType - Given a constraint letter, return the type of
4823 /// constraint it is for this target.
4824 ARMTargetLowering::ConstraintType
4825 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
4826 if (Constraint.size() == 1) {
4827 switch (Constraint[0]) {
4829 case 'l': return C_RegisterClass;
4830 case 'w': return C_RegisterClass;
4833 return TargetLowering::getConstraintType(Constraint);
4836 std::pair<unsigned, const TargetRegisterClass*>
4837 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
4839 if (Constraint.size() == 1) {
4840 // GCC ARM Constraint Letters
4841 switch (Constraint[0]) {
4843 if (Subtarget->isThumb())
4844 return std::make_pair(0U, ARM::tGPRRegisterClass);
4846 return std::make_pair(0U, ARM::GPRRegisterClass);
4848 return std::make_pair(0U, ARM::GPRRegisterClass);
4851 return std::make_pair(0U, ARM::SPRRegisterClass);
4852 if (VT.getSizeInBits() == 64)
4853 return std::make_pair(0U, ARM::DPRRegisterClass);
4854 if (VT.getSizeInBits() == 128)
4855 return std::make_pair(0U, ARM::QPRRegisterClass);
4859 if (StringRef("{cc}").equals_lower(Constraint))
4860 return std::make_pair(0U, ARM::CCRRegisterClass);
4862 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
4865 std::vector<unsigned> ARMTargetLowering::
4866 getRegClassForInlineAsmConstraint(const std::string &Constraint,
4868 if (Constraint.size() != 1)
4869 return std::vector<unsigned>();
4871 switch (Constraint[0]) { // GCC ARM Constraint Letters
4874 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
4875 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
4878 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
4879 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
4880 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
4881 ARM::R12, ARM::LR, 0);
4884 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
4885 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
4886 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
4887 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
4888 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
4889 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
4890 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
4891 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
4892 if (VT.getSizeInBits() == 64)
4893 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
4894 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
4895 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
4896 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
4897 if (VT.getSizeInBits() == 128)
4898 return make_vector<unsigned>(ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
4899 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7, 0);
4903 return std::vector<unsigned>();
4906 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
4907 /// vector. If it is invalid, don't add anything to Ops.
4908 void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
4911 std::vector<SDValue>&Ops,
4912 SelectionDAG &DAG) const {
4913 SDValue Result(0, 0);
4915 switch (Constraint) {
4917 case 'I': case 'J': case 'K': case 'L':
4918 case 'M': case 'N': case 'O':
4919 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
4923 int64_t CVal64 = C->getSExtValue();
4924 int CVal = (int) CVal64;
4925 // None of these constraints allow values larger than 32 bits. Check
4926 // that the value fits in an int.
4930 switch (Constraint) {
4932 if (Subtarget->isThumb1Only()) {
4933 // This must be a constant between 0 and 255, for ADD
4935 if (CVal >= 0 && CVal <= 255)
4937 } else if (Subtarget->isThumb2()) {
4938 // A constant that can be used as an immediate value in a
4939 // data-processing instruction.
4940 if (ARM_AM::getT2SOImmVal(CVal) != -1)
4943 // A constant that can be used as an immediate value in a
4944 // data-processing instruction.
4945 if (ARM_AM::getSOImmVal(CVal) != -1)
4951 if (Subtarget->isThumb()) { // FIXME thumb2
4952 // This must be a constant between -255 and -1, for negated ADD
4953 // immediates. This can be used in GCC with an "n" modifier that
4954 // prints the negated value, for use with SUB instructions. It is
4955 // not useful otherwise but is implemented for compatibility.
4956 if (CVal >= -255 && CVal <= -1)
4959 // This must be a constant between -4095 and 4095. It is not clear
4960 // what this constraint is intended for. Implemented for
4961 // compatibility with GCC.
4962 if (CVal >= -4095 && CVal <= 4095)
4968 if (Subtarget->isThumb1Only()) {
4969 // A 32-bit value where only one byte has a nonzero value. Exclude
4970 // zero to match GCC. This constraint is used by GCC internally for
4971 // constants that can be loaded with a move/shift combination.
4972 // It is not useful otherwise but is implemented for compatibility.
4973 if (CVal != 0 && ARM_AM::isThumbImmShiftedVal(CVal))
4975 } else if (Subtarget->isThumb2()) {
4976 // A constant whose bitwise inverse can be used as an immediate
4977 // value in a data-processing instruction. This can be used in GCC
4978 // with a "B" modifier that prints the inverted value, for use with
4979 // BIC and MVN instructions. It is not useful otherwise but is
4980 // implemented for compatibility.
4981 if (ARM_AM::getT2SOImmVal(~CVal) != -1)
4984 // A constant whose bitwise inverse can be used as an immediate
4985 // value in a data-processing instruction. This can be used in GCC
4986 // with a "B" modifier that prints the inverted value, for use with
4987 // BIC and MVN instructions. It is not useful otherwise but is
4988 // implemented for compatibility.
4989 if (ARM_AM::getSOImmVal(~CVal) != -1)
4995 if (Subtarget->isThumb1Only()) {
4996 // This must be a constant between -7 and 7,
4997 // for 3-operand ADD/SUB immediate instructions.
4998 if (CVal >= -7 && CVal < 7)
5000 } else if (Subtarget->isThumb2()) {
5001 // A constant whose negation can be used as an immediate value in a
5002 // data-processing instruction. This can be used in GCC with an "n"
5003 // modifier that prints the negated value, for use with SUB
5004 // instructions. It is not useful otherwise but is implemented for
5006 if (ARM_AM::getT2SOImmVal(-CVal) != -1)
5009 // A constant whose negation can be used as an immediate value in a
5010 // data-processing instruction. This can be used in GCC with an "n"
5011 // modifier that prints the negated value, for use with SUB
5012 // instructions. It is not useful otherwise but is implemented for
5014 if (ARM_AM::getSOImmVal(-CVal) != -1)
5020 if (Subtarget->isThumb()) { // FIXME thumb2
5021 // This must be a multiple of 4 between 0 and 1020, for
5022 // ADD sp + immediate.
5023 if ((CVal >= 0 && CVal <= 1020) && ((CVal & 3) == 0))
5026 // A power of two or a constant between 0 and 32. This is used in
5027 // GCC for the shift amount on shifted register operands, but it is
5028 // useful in general for any shift amounts.
5029 if ((CVal >= 0 && CVal <= 32) || ((CVal & (CVal - 1)) == 0))
5035 if (Subtarget->isThumb()) { // FIXME thumb2
5036 // This must be a constant between 0 and 31, for shift amounts.
5037 if (CVal >= 0 && CVal <= 31)
5043 if (Subtarget->isThumb()) { // FIXME thumb2
5044 // This must be a multiple of 4 between -508 and 508, for
5045 // ADD/SUB sp = sp + immediate.
5046 if ((CVal >= -508 && CVal <= 508) && ((CVal & 3) == 0))
5051 Result = DAG.getTargetConstant(CVal, Op.getValueType());
5055 if (Result.getNode()) {
5056 Ops.push_back(Result);
5059 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, hasMemory,
5064 ARMTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
5065 // The ARM target isn't yet aware of offsets.
5069 int ARM::getVFPf32Imm(const APFloat &FPImm) {
5070 APInt Imm = FPImm.bitcastToAPInt();
5071 uint32_t Sign = Imm.lshr(31).getZExtValue() & 1;
5072 int32_t Exp = (Imm.lshr(23).getSExtValue() & 0xff) - 127; // -126 to 127
5073 int64_t Mantissa = Imm.getZExtValue() & 0x7fffff; // 23 bits
5075 // We can handle 4 bits of mantissa.
5076 // mantissa = (16+UInt(e:f:g:h))/16.
5077 if (Mantissa & 0x7ffff)
5080 if ((Mantissa & 0xf) != Mantissa)
5083 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
5084 if (Exp < -3 || Exp > 4)
5086 Exp = ((Exp+3) & 0x7) ^ 4;
5088 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
5091 int ARM::getVFPf64Imm(const APFloat &FPImm) {
5092 APInt Imm = FPImm.bitcastToAPInt();
5093 uint64_t Sign = Imm.lshr(63).getZExtValue() & 1;
5094 int64_t Exp = (Imm.lshr(52).getSExtValue() & 0x7ff) - 1023; // -1022 to 1023
5095 uint64_t Mantissa = Imm.getZExtValue() & 0xfffffffffffffLL;
5097 // We can handle 4 bits of mantissa.
5098 // mantissa = (16+UInt(e:f:g:h))/16.
5099 if (Mantissa & 0xffffffffffffLL)
5102 if ((Mantissa & 0xf) != Mantissa)
5105 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
5106 if (Exp < -3 || Exp > 4)
5108 Exp = ((Exp+3) & 0x7) ^ 4;
5110 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
5113 /// isFPImmLegal - Returns true if the target can instruction select the
5114 /// specified FP immediate natively. If false, the legalizer will
5115 /// materialize the FP immediate as a load from a constant pool.
5116 bool ARMTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
5117 if (!Subtarget->hasVFP3())
5120 return ARM::getVFPf32Imm(Imm) != -1;
5122 return ARM::getVFPf64Imm(Imm) != -1;