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."),
66 ARMInterworking("arm-interworking", cl::Hidden,
67 cl::desc("Enable / disable ARM interworking (for debugging only)"),
71 EnableARMCodePlacement("arm-code-placement", cl::Hidden,
72 cl::desc("Enable code placement pass for ARM."),
75 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
76 CCValAssign::LocInfo &LocInfo,
77 ISD::ArgFlagsTy &ArgFlags,
79 static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
80 CCValAssign::LocInfo &LocInfo,
81 ISD::ArgFlagsTy &ArgFlags,
83 static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
84 CCValAssign::LocInfo &LocInfo,
85 ISD::ArgFlagsTy &ArgFlags,
87 static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
88 CCValAssign::LocInfo &LocInfo,
89 ISD::ArgFlagsTy &ArgFlags,
92 void ARMTargetLowering::addTypeForNEON(EVT VT, EVT PromotedLdStVT,
93 EVT PromotedBitwiseVT) {
94 if (VT != PromotedLdStVT) {
95 setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote);
96 AddPromotedToType (ISD::LOAD, VT.getSimpleVT(),
97 PromotedLdStVT.getSimpleVT());
99 setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote);
100 AddPromotedToType (ISD::STORE, VT.getSimpleVT(),
101 PromotedLdStVT.getSimpleVT());
104 EVT ElemTy = VT.getVectorElementType();
105 if (ElemTy != MVT::i64 && ElemTy != MVT::f64)
106 setOperationAction(ISD::VSETCC, VT.getSimpleVT(), Custom);
107 if (ElemTy == MVT::i8 || ElemTy == MVT::i16)
108 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT.getSimpleVT(), Custom);
109 if (ElemTy != MVT::i32) {
110 setOperationAction(ISD::SINT_TO_FP, VT.getSimpleVT(), Expand);
111 setOperationAction(ISD::UINT_TO_FP, VT.getSimpleVT(), Expand);
112 setOperationAction(ISD::FP_TO_SINT, VT.getSimpleVT(), Expand);
113 setOperationAction(ISD::FP_TO_UINT, VT.getSimpleVT(), Expand);
115 setOperationAction(ISD::BUILD_VECTOR, VT.getSimpleVT(), Custom);
116 setOperationAction(ISD::VECTOR_SHUFFLE, VT.getSimpleVT(), Custom);
117 setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Legal);
118 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT.getSimpleVT(), Expand);
119 setOperationAction(ISD::SELECT, VT.getSimpleVT(), Expand);
120 setOperationAction(ISD::SELECT_CC, VT.getSimpleVT(), Expand);
121 if (VT.isInteger()) {
122 setOperationAction(ISD::SHL, VT.getSimpleVT(), Custom);
123 setOperationAction(ISD::SRA, VT.getSimpleVT(), Custom);
124 setOperationAction(ISD::SRL, VT.getSimpleVT(), Custom);
127 // Promote all bit-wise operations.
128 if (VT.isInteger() && VT != PromotedBitwiseVT) {
129 setOperationAction(ISD::AND, VT.getSimpleVT(), Promote);
130 AddPromotedToType (ISD::AND, VT.getSimpleVT(),
131 PromotedBitwiseVT.getSimpleVT());
132 setOperationAction(ISD::OR, VT.getSimpleVT(), Promote);
133 AddPromotedToType (ISD::OR, VT.getSimpleVT(),
134 PromotedBitwiseVT.getSimpleVT());
135 setOperationAction(ISD::XOR, VT.getSimpleVT(), Promote);
136 AddPromotedToType (ISD::XOR, VT.getSimpleVT(),
137 PromotedBitwiseVT.getSimpleVT());
140 // Neon does not support vector divide/remainder operations.
141 setOperationAction(ISD::SDIV, VT.getSimpleVT(), Expand);
142 setOperationAction(ISD::UDIV, VT.getSimpleVT(), Expand);
143 setOperationAction(ISD::FDIV, VT.getSimpleVT(), Expand);
144 setOperationAction(ISD::SREM, VT.getSimpleVT(), Expand);
145 setOperationAction(ISD::UREM, VT.getSimpleVT(), Expand);
146 setOperationAction(ISD::FREM, VT.getSimpleVT(), Expand);
149 void ARMTargetLowering::addDRTypeForNEON(EVT VT) {
150 addRegisterClass(VT, ARM::DPRRegisterClass);
151 addTypeForNEON(VT, MVT::f64, MVT::v2i32);
154 void ARMTargetLowering::addQRTypeForNEON(EVT VT) {
155 addRegisterClass(VT, ARM::QPRRegisterClass);
156 addTypeForNEON(VT, MVT::v2f64, MVT::v4i32);
159 static TargetLoweringObjectFile *createTLOF(TargetMachine &TM) {
160 if (TM.getSubtarget<ARMSubtarget>().isTargetDarwin())
161 return new TargetLoweringObjectFileMachO();
163 return new ARMElfTargetObjectFile();
166 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
167 : TargetLowering(TM, createTLOF(TM)) {
168 Subtarget = &TM.getSubtarget<ARMSubtarget>();
170 if (Subtarget->isTargetDarwin()) {
171 // Uses VFP for Thumb libfuncs if available.
172 if (Subtarget->isThumb() && Subtarget->hasVFP2()) {
173 // Single-precision floating-point arithmetic.
174 setLibcallName(RTLIB::ADD_F32, "__addsf3vfp");
175 setLibcallName(RTLIB::SUB_F32, "__subsf3vfp");
176 setLibcallName(RTLIB::MUL_F32, "__mulsf3vfp");
177 setLibcallName(RTLIB::DIV_F32, "__divsf3vfp");
179 // Double-precision floating-point arithmetic.
180 setLibcallName(RTLIB::ADD_F64, "__adddf3vfp");
181 setLibcallName(RTLIB::SUB_F64, "__subdf3vfp");
182 setLibcallName(RTLIB::MUL_F64, "__muldf3vfp");
183 setLibcallName(RTLIB::DIV_F64, "__divdf3vfp");
185 // Single-precision comparisons.
186 setLibcallName(RTLIB::OEQ_F32, "__eqsf2vfp");
187 setLibcallName(RTLIB::UNE_F32, "__nesf2vfp");
188 setLibcallName(RTLIB::OLT_F32, "__ltsf2vfp");
189 setLibcallName(RTLIB::OLE_F32, "__lesf2vfp");
190 setLibcallName(RTLIB::OGE_F32, "__gesf2vfp");
191 setLibcallName(RTLIB::OGT_F32, "__gtsf2vfp");
192 setLibcallName(RTLIB::UO_F32, "__unordsf2vfp");
193 setLibcallName(RTLIB::O_F32, "__unordsf2vfp");
195 setCmpLibcallCC(RTLIB::OEQ_F32, ISD::SETNE);
196 setCmpLibcallCC(RTLIB::UNE_F32, ISD::SETNE);
197 setCmpLibcallCC(RTLIB::OLT_F32, ISD::SETNE);
198 setCmpLibcallCC(RTLIB::OLE_F32, ISD::SETNE);
199 setCmpLibcallCC(RTLIB::OGE_F32, ISD::SETNE);
200 setCmpLibcallCC(RTLIB::OGT_F32, ISD::SETNE);
201 setCmpLibcallCC(RTLIB::UO_F32, ISD::SETNE);
202 setCmpLibcallCC(RTLIB::O_F32, ISD::SETEQ);
204 // Double-precision comparisons.
205 setLibcallName(RTLIB::OEQ_F64, "__eqdf2vfp");
206 setLibcallName(RTLIB::UNE_F64, "__nedf2vfp");
207 setLibcallName(RTLIB::OLT_F64, "__ltdf2vfp");
208 setLibcallName(RTLIB::OLE_F64, "__ledf2vfp");
209 setLibcallName(RTLIB::OGE_F64, "__gedf2vfp");
210 setLibcallName(RTLIB::OGT_F64, "__gtdf2vfp");
211 setLibcallName(RTLIB::UO_F64, "__unorddf2vfp");
212 setLibcallName(RTLIB::O_F64, "__unorddf2vfp");
214 setCmpLibcallCC(RTLIB::OEQ_F64, ISD::SETNE);
215 setCmpLibcallCC(RTLIB::UNE_F64, ISD::SETNE);
216 setCmpLibcallCC(RTLIB::OLT_F64, ISD::SETNE);
217 setCmpLibcallCC(RTLIB::OLE_F64, ISD::SETNE);
218 setCmpLibcallCC(RTLIB::OGE_F64, ISD::SETNE);
219 setCmpLibcallCC(RTLIB::OGT_F64, ISD::SETNE);
220 setCmpLibcallCC(RTLIB::UO_F64, ISD::SETNE);
221 setCmpLibcallCC(RTLIB::O_F64, ISD::SETEQ);
223 // Floating-point to integer conversions.
224 // i64 conversions are done via library routines even when generating VFP
225 // instructions, so use the same ones.
226 setLibcallName(RTLIB::FPTOSINT_F64_I32, "__fixdfsivfp");
227 setLibcallName(RTLIB::FPTOUINT_F64_I32, "__fixunsdfsivfp");
228 setLibcallName(RTLIB::FPTOSINT_F32_I32, "__fixsfsivfp");
229 setLibcallName(RTLIB::FPTOUINT_F32_I32, "__fixunssfsivfp");
231 // Conversions between floating types.
232 setLibcallName(RTLIB::FPROUND_F64_F32, "__truncdfsf2vfp");
233 setLibcallName(RTLIB::FPEXT_F32_F64, "__extendsfdf2vfp");
235 // Integer to floating-point conversions.
236 // i64 conversions are done via library routines even when generating VFP
237 // instructions, so use the same ones.
238 // FIXME: There appears to be some naming inconsistency in ARM libgcc:
239 // e.g., __floatunsidf vs. __floatunssidfvfp.
240 setLibcallName(RTLIB::SINTTOFP_I32_F64, "__floatsidfvfp");
241 setLibcallName(RTLIB::UINTTOFP_I32_F64, "__floatunssidfvfp");
242 setLibcallName(RTLIB::SINTTOFP_I32_F32, "__floatsisfvfp");
243 setLibcallName(RTLIB::UINTTOFP_I32_F32, "__floatunssisfvfp");
247 // These libcalls are not available in 32-bit.
248 setLibcallName(RTLIB::SHL_I128, 0);
249 setLibcallName(RTLIB::SRL_I128, 0);
250 setLibcallName(RTLIB::SRA_I128, 0);
252 // Libcalls should use the AAPCS base standard ABI, even if hard float
253 // is in effect, as per the ARM RTABI specification, section 4.1.2.
254 if (Subtarget->isAAPCS_ABI()) {
255 for (int i = 0; i < RTLIB::UNKNOWN_LIBCALL; ++i) {
256 setLibcallCallingConv(static_cast<RTLIB::Libcall>(i),
257 CallingConv::ARM_AAPCS);
261 if (Subtarget->isThumb1Only())
262 addRegisterClass(MVT::i32, ARM::tGPRRegisterClass);
264 addRegisterClass(MVT::i32, ARM::GPRRegisterClass);
265 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
266 addRegisterClass(MVT::f32, ARM::SPRRegisterClass);
267 addRegisterClass(MVT::f64, ARM::DPRRegisterClass);
269 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
272 if (Subtarget->hasNEON()) {
273 addDRTypeForNEON(MVT::v2f32);
274 addDRTypeForNEON(MVT::v8i8);
275 addDRTypeForNEON(MVT::v4i16);
276 addDRTypeForNEON(MVT::v2i32);
277 addDRTypeForNEON(MVT::v1i64);
279 addQRTypeForNEON(MVT::v4f32);
280 addQRTypeForNEON(MVT::v2f64);
281 addQRTypeForNEON(MVT::v16i8);
282 addQRTypeForNEON(MVT::v8i16);
283 addQRTypeForNEON(MVT::v4i32);
284 addQRTypeForNEON(MVT::v2i64);
286 // v2f64 is legal so that QR subregs can be extracted as f64 elements, but
287 // neither Neon nor VFP support any arithmetic operations on it.
288 setOperationAction(ISD::FADD, MVT::v2f64, Expand);
289 setOperationAction(ISD::FSUB, MVT::v2f64, Expand);
290 setOperationAction(ISD::FMUL, MVT::v2f64, Expand);
291 setOperationAction(ISD::FDIV, MVT::v2f64, Expand);
292 setOperationAction(ISD::FREM, MVT::v2f64, Expand);
293 setOperationAction(ISD::FCOPYSIGN, MVT::v2f64, Expand);
294 setOperationAction(ISD::VSETCC, MVT::v2f64, Expand);
295 setOperationAction(ISD::FNEG, MVT::v2f64, Expand);
296 setOperationAction(ISD::FABS, MVT::v2f64, Expand);
297 setOperationAction(ISD::FSQRT, MVT::v2f64, Expand);
298 setOperationAction(ISD::FSIN, MVT::v2f64, Expand);
299 setOperationAction(ISD::FCOS, MVT::v2f64, Expand);
300 setOperationAction(ISD::FPOWI, MVT::v2f64, Expand);
301 setOperationAction(ISD::FPOW, MVT::v2f64, Expand);
302 setOperationAction(ISD::FLOG, MVT::v2f64, Expand);
303 setOperationAction(ISD::FLOG2, MVT::v2f64, Expand);
304 setOperationAction(ISD::FLOG10, MVT::v2f64, Expand);
305 setOperationAction(ISD::FEXP, MVT::v2f64, Expand);
306 setOperationAction(ISD::FEXP2, MVT::v2f64, Expand);
307 setOperationAction(ISD::FCEIL, MVT::v2f64, Expand);
308 setOperationAction(ISD::FTRUNC, MVT::v2f64, Expand);
309 setOperationAction(ISD::FRINT, MVT::v2f64, Expand);
310 setOperationAction(ISD::FNEARBYINT, MVT::v2f64, Expand);
311 setOperationAction(ISD::FFLOOR, MVT::v2f64, Expand);
313 // Neon does not support some operations on v1i64 and v2i64 types.
314 setOperationAction(ISD::MUL, MVT::v1i64, Expand);
315 setOperationAction(ISD::MUL, MVT::v2i64, Expand);
316 setOperationAction(ISD::VSETCC, MVT::v1i64, Expand);
317 setOperationAction(ISD::VSETCC, MVT::v2i64, Expand);
319 setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
320 setTargetDAGCombine(ISD::SHL);
321 setTargetDAGCombine(ISD::SRL);
322 setTargetDAGCombine(ISD::SRA);
323 setTargetDAGCombine(ISD::SIGN_EXTEND);
324 setTargetDAGCombine(ISD::ZERO_EXTEND);
325 setTargetDAGCombine(ISD::ANY_EXTEND);
326 setTargetDAGCombine(ISD::SELECT_CC);
329 computeRegisterProperties();
331 // ARM does not have f32 extending load.
332 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
334 // ARM does not have i1 sign extending load.
335 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
337 // ARM supports all 4 flavors of integer indexed load / store.
338 if (!Subtarget->isThumb1Only()) {
339 for (unsigned im = (unsigned)ISD::PRE_INC;
340 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
341 setIndexedLoadAction(im, MVT::i1, Legal);
342 setIndexedLoadAction(im, MVT::i8, Legal);
343 setIndexedLoadAction(im, MVT::i16, Legal);
344 setIndexedLoadAction(im, MVT::i32, Legal);
345 setIndexedStoreAction(im, MVT::i1, Legal);
346 setIndexedStoreAction(im, MVT::i8, Legal);
347 setIndexedStoreAction(im, MVT::i16, Legal);
348 setIndexedStoreAction(im, MVT::i32, Legal);
352 // i64 operation support.
353 if (Subtarget->isThumb1Only()) {
354 setOperationAction(ISD::MUL, MVT::i64, Expand);
355 setOperationAction(ISD::MULHU, MVT::i32, Expand);
356 setOperationAction(ISD::MULHS, MVT::i32, Expand);
357 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
358 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
360 setOperationAction(ISD::MUL, MVT::i64, Expand);
361 setOperationAction(ISD::MULHU, MVT::i32, Expand);
362 if (!Subtarget->hasV6Ops())
363 setOperationAction(ISD::MULHS, MVT::i32, Expand);
365 setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
366 setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
367 setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
368 setOperationAction(ISD::SRL, MVT::i64, Custom);
369 setOperationAction(ISD::SRA, MVT::i64, Custom);
371 // ARM does not have ROTL.
372 setOperationAction(ISD::ROTL, MVT::i32, Expand);
373 setOperationAction(ISD::CTTZ, MVT::i32, Custom);
374 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
375 if (!Subtarget->hasV5TOps() || Subtarget->isThumb1Only())
376 setOperationAction(ISD::CTLZ, MVT::i32, Expand);
378 // Only ARMv6 has BSWAP.
379 if (!Subtarget->hasV6Ops())
380 setOperationAction(ISD::BSWAP, MVT::i32, Expand);
382 // These are expanded into libcalls.
383 if (!Subtarget->hasDivide()) {
384 // v7M has a hardware divider
385 setOperationAction(ISD::SDIV, MVT::i32, Expand);
386 setOperationAction(ISD::UDIV, MVT::i32, Expand);
388 setOperationAction(ISD::SREM, MVT::i32, Expand);
389 setOperationAction(ISD::UREM, MVT::i32, Expand);
390 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
391 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
393 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
394 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
395 setOperationAction(ISD::GLOBAL_OFFSET_TABLE, MVT::i32, Custom);
396 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
397 setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
399 setOperationAction(ISD::TRAP, MVT::Other, Legal);
401 // Use the default implementation.
402 setOperationAction(ISD::VASTART, MVT::Other, Custom);
403 setOperationAction(ISD::VAARG, MVT::Other, Expand);
404 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
405 setOperationAction(ISD::VAEND, MVT::Other, Expand);
406 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
407 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
408 setOperationAction(ISD::EHSELECTION, MVT::i32, Expand);
409 // FIXME: Shouldn't need this, since no register is used, but the legalizer
410 // doesn't yet know how to not do that for SjLj.
411 setExceptionSelectorRegister(ARM::R0);
412 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
413 // Handle atomics directly for ARMv[67] (except for Thumb1), otherwise
414 // use the default expansion.
415 bool canHandleAtomics =
416 (Subtarget->hasV7Ops() ||
417 (Subtarget->hasV6Ops() && !Subtarget->isThumb1Only()));
418 if (canHandleAtomics) {
419 // membarrier needs custom lowering; the rest are legal and handled
421 setOperationAction(ISD::MEMBARRIER, MVT::Other, Custom);
423 // Set them all for expansion, which will force libcalls.
424 setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
425 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i8, Expand);
426 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i16, Expand);
427 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i32, Expand);
428 setOperationAction(ISD::ATOMIC_SWAP, MVT::i8, Expand);
429 setOperationAction(ISD::ATOMIC_SWAP, MVT::i16, Expand);
430 setOperationAction(ISD::ATOMIC_SWAP, MVT::i32, Expand);
431 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i8, Expand);
432 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i16, Expand);
433 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i32, Expand);
434 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i8, Expand);
435 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i16, Expand);
436 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i32, Expand);
437 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i8, Expand);
438 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i16, Expand);
439 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i32, Expand);
440 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i8, Expand);
441 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i16, Expand);
442 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i32, Expand);
443 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i8, Expand);
444 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i16, Expand);
445 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i32, Expand);
446 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i8, Expand);
447 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i16, Expand);
448 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i32, Expand);
449 // Since the libcalls include locking, fold in the fences
450 setShouldFoldAtomicFences(true);
452 // 64-bit versions are always libcalls (for now)
453 setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i64, Expand);
454 setOperationAction(ISD::ATOMIC_SWAP, MVT::i64, Expand);
455 setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i64, Expand);
456 setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i64, Expand);
457 setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i64, Expand);
458 setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i64, Expand);
459 setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i64, Expand);
460 setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i64, Expand);
462 // Requires SXTB/SXTH, available on v6 and up in both ARM and Thumb modes.
463 if (!Subtarget->hasV6Ops()) {
464 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
465 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
467 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
469 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only())
470 // Turn f64->i64 into VMOVRRD, i64 -> f64 to VMOVDRR
471 // iff target supports vfp2.
472 setOperationAction(ISD::BIT_CONVERT, MVT::i64, Custom);
474 // We want to custom lower some of our intrinsics.
475 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
476 if (Subtarget->isTargetDarwin()) {
477 setOperationAction(ISD::EH_SJLJ_SETJMP, MVT::i32, Custom);
478 setOperationAction(ISD::EH_SJLJ_LONGJMP, MVT::Other, Custom);
481 setOperationAction(ISD::SETCC, MVT::i32, Expand);
482 setOperationAction(ISD::SETCC, MVT::f32, Expand);
483 setOperationAction(ISD::SETCC, MVT::f64, Expand);
484 setOperationAction(ISD::SELECT, MVT::i32, Expand);
485 setOperationAction(ISD::SELECT, MVT::f32, Expand);
486 setOperationAction(ISD::SELECT, MVT::f64, Expand);
487 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
488 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
489 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
491 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
492 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
493 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
494 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
495 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
497 // We don't support sin/cos/fmod/copysign/pow
498 setOperationAction(ISD::FSIN, MVT::f64, Expand);
499 setOperationAction(ISD::FSIN, MVT::f32, Expand);
500 setOperationAction(ISD::FCOS, MVT::f32, Expand);
501 setOperationAction(ISD::FCOS, MVT::f64, Expand);
502 setOperationAction(ISD::FREM, MVT::f64, Expand);
503 setOperationAction(ISD::FREM, MVT::f32, Expand);
504 if (!UseSoftFloat && Subtarget->hasVFP2() && !Subtarget->isThumb1Only()) {
505 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
506 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
508 setOperationAction(ISD::FPOW, MVT::f64, Expand);
509 setOperationAction(ISD::FPOW, MVT::f32, Expand);
511 // Various VFP goodness
512 if (!UseSoftFloat && !Subtarget->isThumb1Only()) {
513 // int <-> fp are custom expanded into bit_convert + ARMISD ops.
514 if (Subtarget->hasVFP2()) {
515 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
516 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
517 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
518 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
520 // Special handling for half-precision FP.
521 if (!Subtarget->hasFP16()) {
522 setOperationAction(ISD::FP16_TO_FP32, MVT::f32, Expand);
523 setOperationAction(ISD::FP32_TO_FP16, MVT::i32, Expand);
527 // We have target-specific dag combine patterns for the following nodes:
528 // ARMISD::VMOVRRD - No need to call setTargetDAGCombine
529 setTargetDAGCombine(ISD::ADD);
530 setTargetDAGCombine(ISD::SUB);
531 setTargetDAGCombine(ISD::MUL);
533 setStackPointerRegisterToSaveRestore(ARM::SP);
535 if (UseSoftFloat || Subtarget->isThumb1Only() || !Subtarget->hasVFP2())
536 setSchedulingPreference(Sched::RegPressure);
538 setSchedulingPreference(Sched::Hybrid);
540 maxStoresPerMemcpy = 1; //// temporary - rewrite interface to use type
542 if (EnableARMCodePlacement)
543 benefitFromCodePlacementOpt = true;
546 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
549 case ARMISD::Wrapper: return "ARMISD::Wrapper";
550 case ARMISD::WrapperJT: return "ARMISD::WrapperJT";
551 case ARMISD::CALL: return "ARMISD::CALL";
552 case ARMISD::CALL_PRED: return "ARMISD::CALL_PRED";
553 case ARMISD::CALL_NOLINK: return "ARMISD::CALL_NOLINK";
554 case ARMISD::tCALL: return "ARMISD::tCALL";
555 case ARMISD::BRCOND: return "ARMISD::BRCOND";
556 case ARMISD::BR_JT: return "ARMISD::BR_JT";
557 case ARMISD::BR2_JT: return "ARMISD::BR2_JT";
558 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
559 case ARMISD::PIC_ADD: return "ARMISD::PIC_ADD";
560 case ARMISD::CMP: return "ARMISD::CMP";
561 case ARMISD::CMPZ: return "ARMISD::CMPZ";
562 case ARMISD::CMPFP: return "ARMISD::CMPFP";
563 case ARMISD::CMPFPw0: return "ARMISD::CMPFPw0";
564 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
565 case ARMISD::CMOV: return "ARMISD::CMOV";
566 case ARMISD::CNEG: return "ARMISD::CNEG";
568 case ARMISD::RBIT: return "ARMISD::RBIT";
570 case ARMISD::FTOSI: return "ARMISD::FTOSI";
571 case ARMISD::FTOUI: return "ARMISD::FTOUI";
572 case ARMISD::SITOF: return "ARMISD::SITOF";
573 case ARMISD::UITOF: return "ARMISD::UITOF";
575 case ARMISD::SRL_FLAG: return "ARMISD::SRL_FLAG";
576 case ARMISD::SRA_FLAG: return "ARMISD::SRA_FLAG";
577 case ARMISD::RRX: return "ARMISD::RRX";
579 case ARMISD::VMOVRRD: return "ARMISD::VMOVRRD";
580 case ARMISD::VMOVDRR: return "ARMISD::VMOVDRR";
582 case ARMISD::EH_SJLJ_SETJMP: return "ARMISD::EH_SJLJ_SETJMP";
583 case ARMISD::EH_SJLJ_LONGJMP:return "ARMISD::EH_SJLJ_LONGJMP";
585 case ARMISD::TC_RETURN: return "ARMISD::TC_RETURN";
587 case ARMISD::THREAD_POINTER:return "ARMISD::THREAD_POINTER";
589 case ARMISD::DYN_ALLOC: return "ARMISD::DYN_ALLOC";
591 case ARMISD::MEMBARRIER: return "ARMISD::MEMBARRIER";
592 case ARMISD::SYNCBARRIER: return "ARMISD::SYNCBARRIER";
594 case ARMISD::VCEQ: return "ARMISD::VCEQ";
595 case ARMISD::VCGE: return "ARMISD::VCGE";
596 case ARMISD::VCGEU: return "ARMISD::VCGEU";
597 case ARMISD::VCGT: return "ARMISD::VCGT";
598 case ARMISD::VCGTU: return "ARMISD::VCGTU";
599 case ARMISD::VTST: return "ARMISD::VTST";
601 case ARMISD::VSHL: return "ARMISD::VSHL";
602 case ARMISD::VSHRs: return "ARMISD::VSHRs";
603 case ARMISD::VSHRu: return "ARMISD::VSHRu";
604 case ARMISD::VSHLLs: return "ARMISD::VSHLLs";
605 case ARMISD::VSHLLu: return "ARMISD::VSHLLu";
606 case ARMISD::VSHLLi: return "ARMISD::VSHLLi";
607 case ARMISD::VSHRN: return "ARMISD::VSHRN";
608 case ARMISD::VRSHRs: return "ARMISD::VRSHRs";
609 case ARMISD::VRSHRu: return "ARMISD::VRSHRu";
610 case ARMISD::VRSHRN: return "ARMISD::VRSHRN";
611 case ARMISD::VQSHLs: return "ARMISD::VQSHLs";
612 case ARMISD::VQSHLu: return "ARMISD::VQSHLu";
613 case ARMISD::VQSHLsu: return "ARMISD::VQSHLsu";
614 case ARMISD::VQSHRNs: return "ARMISD::VQSHRNs";
615 case ARMISD::VQSHRNu: return "ARMISD::VQSHRNu";
616 case ARMISD::VQSHRNsu: return "ARMISD::VQSHRNsu";
617 case ARMISD::VQRSHRNs: return "ARMISD::VQRSHRNs";
618 case ARMISD::VQRSHRNu: return "ARMISD::VQRSHRNu";
619 case ARMISD::VQRSHRNsu: return "ARMISD::VQRSHRNsu";
620 case ARMISD::VGETLANEu: return "ARMISD::VGETLANEu";
621 case ARMISD::VGETLANEs: return "ARMISD::VGETLANEs";
622 case ARMISD::VDUP: return "ARMISD::VDUP";
623 case ARMISD::VDUPLANE: return "ARMISD::VDUPLANE";
624 case ARMISD::VEXT: return "ARMISD::VEXT";
625 case ARMISD::VREV64: return "ARMISD::VREV64";
626 case ARMISD::VREV32: return "ARMISD::VREV32";
627 case ARMISD::VREV16: return "ARMISD::VREV16";
628 case ARMISD::VZIP: return "ARMISD::VZIP";
629 case ARMISD::VUZP: return "ARMISD::VUZP";
630 case ARMISD::VTRN: return "ARMISD::VTRN";
631 case ARMISD::BUILD_VECTOR: return "ARMISD::BUILD_VECTOR";
632 case ARMISD::FMAX: return "ARMISD::FMAX";
633 case ARMISD::FMIN: return "ARMISD::FMIN";
637 /// getRegClassFor - Return the register class that should be used for the
638 /// specified value type.
639 TargetRegisterClass *ARMTargetLowering::getRegClassFor(EVT VT) const {
640 // Map v4i64 to QQ registers but do not make the type legal. Similarly map
641 // v8i64 to QQQQ registers. v4i64 and v8i64 are only used for REG_SEQUENCE to
642 // load / store 4 to 8 consecutive D registers.
643 if (Subtarget->hasNEON()) {
644 if (VT == MVT::v4i64)
645 return ARM::QQPRRegisterClass;
646 else if (VT == MVT::v8i64)
647 return ARM::QQQQPRRegisterClass;
649 return TargetLowering::getRegClassFor(VT);
652 /// getFunctionAlignment - Return the Log2 alignment of this function.
653 unsigned ARMTargetLowering::getFunctionAlignment(const Function *F) const {
654 return getTargetMachine().getSubtarget<ARMSubtarget>().isThumb() ? 1 : 2;
657 Sched::Preference ARMTargetLowering::getSchedulingPreference(SDNode *N) const {
658 unsigned NumVals = N->getNumValues();
660 return Sched::RegPressure;
662 for (unsigned i = 0; i != NumVals; ++i) {
663 EVT VT = N->getValueType(i);
664 if (VT.isFloatingPoint() || VT.isVector())
665 return Sched::Latency;
668 if (!N->isMachineOpcode())
669 return Sched::RegPressure;
671 // Load are scheduled for latency even if there instruction itinerary
673 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
674 const TargetInstrDesc &TID = TII->get(N->getMachineOpcode());
676 return Sched::Latency;
678 const InstrItineraryData &Itins = getTargetMachine().getInstrItineraryData();
679 if (!Itins.isEmpty() && Itins.getStageLatency(TID.getSchedClass()) > 2)
680 return Sched::Latency;
681 return Sched::RegPressure;
684 //===----------------------------------------------------------------------===//
686 //===----------------------------------------------------------------------===//
688 /// IntCCToARMCC - Convert a DAG integer condition code to an ARM CC
689 static ARMCC::CondCodes IntCCToARMCC(ISD::CondCode CC) {
691 default: llvm_unreachable("Unknown condition code!");
692 case ISD::SETNE: return ARMCC::NE;
693 case ISD::SETEQ: return ARMCC::EQ;
694 case ISD::SETGT: return ARMCC::GT;
695 case ISD::SETGE: return ARMCC::GE;
696 case ISD::SETLT: return ARMCC::LT;
697 case ISD::SETLE: return ARMCC::LE;
698 case ISD::SETUGT: return ARMCC::HI;
699 case ISD::SETUGE: return ARMCC::HS;
700 case ISD::SETULT: return ARMCC::LO;
701 case ISD::SETULE: return ARMCC::LS;
705 /// FPCCToARMCC - Convert a DAG fp condition code to an ARM CC.
706 static void FPCCToARMCC(ISD::CondCode CC, ARMCC::CondCodes &CondCode,
707 ARMCC::CondCodes &CondCode2) {
708 CondCode2 = ARMCC::AL;
710 default: llvm_unreachable("Unknown FP condition!");
712 case ISD::SETOEQ: CondCode = ARMCC::EQ; break;
714 case ISD::SETOGT: CondCode = ARMCC::GT; break;
716 case ISD::SETOGE: CondCode = ARMCC::GE; break;
717 case ISD::SETOLT: CondCode = ARMCC::MI; break;
718 case ISD::SETOLE: CondCode = ARMCC::LS; break;
719 case ISD::SETONE: CondCode = ARMCC::MI; CondCode2 = ARMCC::GT; break;
720 case ISD::SETO: CondCode = ARMCC::VC; break;
721 case ISD::SETUO: CondCode = ARMCC::VS; break;
722 case ISD::SETUEQ: CondCode = ARMCC::EQ; CondCode2 = ARMCC::VS; break;
723 case ISD::SETUGT: CondCode = ARMCC::HI; break;
724 case ISD::SETUGE: CondCode = ARMCC::PL; break;
726 case ISD::SETULT: CondCode = ARMCC::LT; break;
728 case ISD::SETULE: CondCode = ARMCC::LE; break;
730 case ISD::SETUNE: CondCode = ARMCC::NE; break;
734 //===----------------------------------------------------------------------===//
735 // Calling Convention Implementation
736 //===----------------------------------------------------------------------===//
738 #include "ARMGenCallingConv.inc"
740 // APCS f64 is in register pairs, possibly split to stack
741 static bool f64AssignAPCS(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
742 CCValAssign::LocInfo &LocInfo,
743 CCState &State, bool CanFail) {
744 static const unsigned RegList[] = { ARM::R0, ARM::R1, ARM::R2, ARM::R3 };
746 // Try to get the first register.
747 if (unsigned Reg = State.AllocateReg(RegList, 4))
748 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
750 // For the 2nd half of a v2f64, do not fail.
754 // Put the whole thing on the stack.
755 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
756 State.AllocateStack(8, 4),
761 // Try to get the second register.
762 if (unsigned Reg = State.AllocateReg(RegList, 4))
763 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
765 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
766 State.AllocateStack(4, 4),
771 static bool CC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
772 CCValAssign::LocInfo &LocInfo,
773 ISD::ArgFlagsTy &ArgFlags,
775 if (!f64AssignAPCS(ValNo, ValVT, LocVT, LocInfo, State, true))
777 if (LocVT == MVT::v2f64 &&
778 !f64AssignAPCS(ValNo, ValVT, LocVT, LocInfo, State, false))
780 return true; // we handled it
783 // AAPCS f64 is in aligned register pairs
784 static bool f64AssignAAPCS(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
785 CCValAssign::LocInfo &LocInfo,
786 CCState &State, bool CanFail) {
787 static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
788 static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
790 unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2);
792 // For the 2nd half of a v2f64, do not just fail.
796 // Put the whole thing on the stack.
797 State.addLoc(CCValAssign::getCustomMem(ValNo, ValVT,
798 State.AllocateStack(8, 8),
804 for (i = 0; i < 2; ++i)
805 if (HiRegList[i] == Reg)
808 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
809 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
814 static bool CC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
815 CCValAssign::LocInfo &LocInfo,
816 ISD::ArgFlagsTy &ArgFlags,
818 if (!f64AssignAAPCS(ValNo, ValVT, LocVT, LocInfo, State, true))
820 if (LocVT == MVT::v2f64 &&
821 !f64AssignAAPCS(ValNo, ValVT, LocVT, LocInfo, State, false))
823 return true; // we handled it
826 static bool f64RetAssign(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
827 CCValAssign::LocInfo &LocInfo, CCState &State) {
828 static const unsigned HiRegList[] = { ARM::R0, ARM::R2 };
829 static const unsigned LoRegList[] = { ARM::R1, ARM::R3 };
831 unsigned Reg = State.AllocateReg(HiRegList, LoRegList, 2);
833 return false; // we didn't handle it
836 for (i = 0; i < 2; ++i)
837 if (HiRegList[i] == Reg)
840 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, Reg, LocVT, LocInfo));
841 State.addLoc(CCValAssign::getCustomReg(ValNo, ValVT, LoRegList[i],
846 static bool RetCC_ARM_APCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
847 CCValAssign::LocInfo &LocInfo,
848 ISD::ArgFlagsTy &ArgFlags,
850 if (!f64RetAssign(ValNo, ValVT, LocVT, LocInfo, State))
852 if (LocVT == MVT::v2f64 && !f64RetAssign(ValNo, ValVT, LocVT, LocInfo, State))
854 return true; // we handled it
857 static bool RetCC_ARM_AAPCS_Custom_f64(unsigned &ValNo, EVT &ValVT, EVT &LocVT,
858 CCValAssign::LocInfo &LocInfo,
859 ISD::ArgFlagsTy &ArgFlags,
861 return RetCC_ARM_APCS_Custom_f64(ValNo, ValVT, LocVT, LocInfo, ArgFlags,
865 /// CCAssignFnForNode - Selects the correct CCAssignFn for a the
866 /// given CallingConvention value.
867 CCAssignFn *ARMTargetLowering::CCAssignFnForNode(CallingConv::ID CC,
869 bool isVarArg) const {
872 llvm_unreachable("Unsupported calling convention");
874 case CallingConv::Fast:
875 // Use target triple & subtarget features to do actual dispatch.
876 if (Subtarget->isAAPCS_ABI()) {
877 if (Subtarget->hasVFP2() &&
878 FloatABIType == FloatABI::Hard && !isVarArg)
879 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
881 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
883 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
884 case CallingConv::ARM_AAPCS_VFP:
885 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
886 case CallingConv::ARM_AAPCS:
887 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
888 case CallingConv::ARM_APCS:
889 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
893 /// LowerCallResult - Lower the result values of a call into the
894 /// appropriate copies out of appropriate physical registers.
896 ARMTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
897 CallingConv::ID CallConv, bool isVarArg,
898 const SmallVectorImpl<ISD::InputArg> &Ins,
899 DebugLoc dl, SelectionDAG &DAG,
900 SmallVectorImpl<SDValue> &InVals) const {
902 // Assign locations to each value returned by this call.
903 SmallVector<CCValAssign, 16> RVLocs;
904 CCState CCInfo(CallConv, isVarArg, getTargetMachine(),
905 RVLocs, *DAG.getContext());
906 CCInfo.AnalyzeCallResult(Ins,
907 CCAssignFnForNode(CallConv, /* Return*/ true,
910 // Copy all of the result registers out of their specified physreg.
911 for (unsigned i = 0; i != RVLocs.size(); ++i) {
912 CCValAssign VA = RVLocs[i];
915 if (VA.needsCustom()) {
916 // Handle f64 or half of a v2f64.
917 SDValue Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
919 Chain = Lo.getValue(1);
920 InFlag = Lo.getValue(2);
921 VA = RVLocs[++i]; // skip ahead to next loc
922 SDValue Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32,
924 Chain = Hi.getValue(1);
925 InFlag = Hi.getValue(2);
926 Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
928 if (VA.getLocVT() == MVT::v2f64) {
929 SDValue Vec = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
930 Vec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val,
931 DAG.getConstant(0, MVT::i32));
933 VA = RVLocs[++i]; // skip ahead to next loc
934 Lo = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag);
935 Chain = Lo.getValue(1);
936 InFlag = Lo.getValue(2);
937 VA = RVLocs[++i]; // skip ahead to next loc
938 Hi = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), MVT::i32, InFlag);
939 Chain = Hi.getValue(1);
940 InFlag = Hi.getValue(2);
941 Val = DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi);
942 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Vec, Val,
943 DAG.getConstant(1, MVT::i32));
946 Val = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), VA.getLocVT(),
948 Chain = Val.getValue(1);
949 InFlag = Val.getValue(2);
952 switch (VA.getLocInfo()) {
953 default: llvm_unreachable("Unknown loc info!");
954 case CCValAssign::Full: break;
955 case CCValAssign::BCvt:
956 Val = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), Val);
960 InVals.push_back(Val);
966 /// CreateCopyOfByValArgument - Make a copy of an aggregate at address specified
967 /// by "Src" to address "Dst" of size "Size". Alignment information is
968 /// specified by the specific parameter attribute. The copy will be passed as
969 /// a byval function parameter.
970 /// Sometimes what we are copying is the end of a larger object, the part that
971 /// does not fit in registers.
973 CreateCopyOfByValArgument(SDValue Src, SDValue Dst, SDValue Chain,
974 ISD::ArgFlagsTy Flags, SelectionDAG &DAG,
976 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i32);
977 return DAG.getMemcpy(Chain, dl, Dst, Src, SizeNode, Flags.getByValAlign(),
978 /*isVolatile=*/false, /*AlwaysInline=*/false,
982 /// LowerMemOpCallTo - Store the argument to the stack.
984 ARMTargetLowering::LowerMemOpCallTo(SDValue Chain,
985 SDValue StackPtr, SDValue Arg,
986 DebugLoc dl, SelectionDAG &DAG,
987 const CCValAssign &VA,
988 ISD::ArgFlagsTy Flags) const {
989 unsigned LocMemOffset = VA.getLocMemOffset();
990 SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
991 PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, PtrOff);
992 if (Flags.isByVal()) {
993 return CreateCopyOfByValArgument(Arg, PtrOff, Chain, Flags, DAG, dl);
995 return DAG.getStore(Chain, dl, Arg, PtrOff,
996 PseudoSourceValue::getStack(), LocMemOffset,
1000 void ARMTargetLowering::PassF64ArgInRegs(DebugLoc dl, SelectionDAG &DAG,
1001 SDValue Chain, SDValue &Arg,
1002 RegsToPassVector &RegsToPass,
1003 CCValAssign &VA, CCValAssign &NextVA,
1005 SmallVector<SDValue, 8> &MemOpChains,
1006 ISD::ArgFlagsTy Flags) const {
1008 SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl,
1009 DAG.getVTList(MVT::i32, MVT::i32), Arg);
1010 RegsToPass.push_back(std::make_pair(VA.getLocReg(), fmrrd));
1012 if (NextVA.isRegLoc())
1013 RegsToPass.push_back(std::make_pair(NextVA.getLocReg(), fmrrd.getValue(1)));
1015 assert(NextVA.isMemLoc());
1016 if (StackPtr.getNode() == 0)
1017 StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
1019 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, fmrrd.getValue(1),
1025 /// LowerCall - Lowering a call into a callseq_start <-
1026 /// ARMISD:CALL <- callseq_end chain. Also add input and output parameter
1029 ARMTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
1030 CallingConv::ID CallConv, bool isVarArg,
1032 const SmallVectorImpl<ISD::OutputArg> &Outs,
1033 const SmallVectorImpl<SDValue> &OutVals,
1034 const SmallVectorImpl<ISD::InputArg> &Ins,
1035 DebugLoc dl, SelectionDAG &DAG,
1036 SmallVectorImpl<SDValue> &InVals) const {
1037 MachineFunction &MF = DAG.getMachineFunction();
1038 bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
1039 bool IsSibCall = false;
1040 // Temporarily disable tail calls so things don't break.
1041 if (!EnableARMTailCalls)
1044 // Check if it's really possible to do a tail call.
1045 isTailCall = IsEligibleForTailCallOptimization(Callee, CallConv,
1046 isVarArg, IsStructRet, MF.getFunction()->hasStructRetAttr(),
1047 Outs, OutVals, Ins, DAG);
1048 // We don't support GuaranteedTailCallOpt for ARM, only automatically
1049 // detected sibcalls.
1056 // Analyze operands of the call, assigning locations to each operand.
1057 SmallVector<CCValAssign, 16> ArgLocs;
1058 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
1060 CCInfo.AnalyzeCallOperands(Outs,
1061 CCAssignFnForNode(CallConv, /* Return*/ false,
1064 // Get a count of how many bytes are to be pushed on the stack.
1065 unsigned NumBytes = CCInfo.getNextStackOffset();
1067 // For tail calls, memory operands are available in our caller's stack.
1071 // Adjust the stack pointer for the new arguments...
1072 // These operations are automatically eliminated by the prolog/epilog pass
1074 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
1076 SDValue StackPtr = DAG.getCopyFromReg(Chain, dl, ARM::SP, getPointerTy());
1078 RegsToPassVector RegsToPass;
1079 SmallVector<SDValue, 8> MemOpChains;
1081 // Walk the register/memloc assignments, inserting copies/loads. In the case
1082 // of tail call optimization, arguments are handled later.
1083 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size();
1085 ++i, ++realArgIdx) {
1086 CCValAssign &VA = ArgLocs[i];
1087 SDValue Arg = OutVals[realArgIdx];
1088 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
1090 // Promote the value if needed.
1091 switch (VA.getLocInfo()) {
1092 default: llvm_unreachable("Unknown loc info!");
1093 case CCValAssign::Full: break;
1094 case CCValAssign::SExt:
1095 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
1097 case CCValAssign::ZExt:
1098 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
1100 case CCValAssign::AExt:
1101 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
1103 case CCValAssign::BCvt:
1104 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
1108 // f64 and v2f64 might be passed in i32 pairs and must be split into pieces
1109 if (VA.needsCustom()) {
1110 if (VA.getLocVT() == MVT::v2f64) {
1111 SDValue Op0 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1112 DAG.getConstant(0, MVT::i32));
1113 SDValue Op1 = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1114 DAG.getConstant(1, MVT::i32));
1116 PassF64ArgInRegs(dl, DAG, Chain, Op0, RegsToPass,
1117 VA, ArgLocs[++i], StackPtr, MemOpChains, Flags);
1119 VA = ArgLocs[++i]; // skip ahead to next loc
1120 if (VA.isRegLoc()) {
1121 PassF64ArgInRegs(dl, DAG, Chain, Op1, RegsToPass,
1122 VA, ArgLocs[++i], StackPtr, MemOpChains, Flags);
1124 assert(VA.isMemLoc());
1126 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Op1,
1127 dl, DAG, VA, Flags));
1130 PassF64ArgInRegs(dl, DAG, Chain, Arg, RegsToPass, VA, ArgLocs[++i],
1131 StackPtr, MemOpChains, Flags);
1133 } else if (VA.isRegLoc()) {
1134 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
1135 } else if (!IsSibCall) {
1136 assert(VA.isMemLoc());
1138 MemOpChains.push_back(LowerMemOpCallTo(Chain, StackPtr, Arg,
1139 dl, DAG, VA, Flags));
1143 if (!MemOpChains.empty())
1144 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1145 &MemOpChains[0], MemOpChains.size());
1147 // Build a sequence of copy-to-reg nodes chained together with token chain
1148 // and flag operands which copy the outgoing args into the appropriate regs.
1150 // Tail call byval lowering might overwrite argument registers so in case of
1151 // tail call optimization the copies to registers are lowered later.
1153 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1154 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
1155 RegsToPass[i].second, InFlag);
1156 InFlag = Chain.getValue(1);
1159 // For tail calls lower the arguments to the 'real' stack slot.
1161 // Force all the incoming stack arguments to be loaded from the stack
1162 // before any new outgoing arguments are stored to the stack, because the
1163 // outgoing stack slots may alias the incoming argument stack slots, and
1164 // the alias isn't otherwise explicit. This is slightly more conservative
1165 // than necessary, because it means that each store effectively depends
1166 // on every argument instead of just those arguments it would clobber.
1168 // Do not flag preceeding copytoreg stuff together with the following stuff.
1170 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1171 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
1172 RegsToPass[i].second, InFlag);
1173 InFlag = Chain.getValue(1);
1178 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
1179 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
1180 // node so that legalize doesn't hack it.
1181 bool isDirect = false;
1182 bool isARMFunc = false;
1183 bool isLocalARMFunc = false;
1184 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1186 if (EnableARMLongCalls) {
1187 assert (getTargetMachine().getRelocationModel() == Reloc::Static
1188 && "long-calls with non-static relocation model!");
1189 // Handle a global address or an external symbol. If it's not one of
1190 // those, the target's already in a register, so we don't need to do
1192 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1193 const GlobalValue *GV = G->getGlobal();
1194 // Create a constant pool entry for the callee address
1195 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1196 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV,
1199 // Get the address of the callee into a register
1200 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1201 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1202 Callee = DAG.getLoad(getPointerTy(), dl,
1203 DAG.getEntryNode(), CPAddr,
1204 PseudoSourceValue::getConstantPool(), 0,
1206 } else if (ExternalSymbolSDNode *S=dyn_cast<ExternalSymbolSDNode>(Callee)) {
1207 const char *Sym = S->getSymbol();
1209 // Create a constant pool entry for the callee address
1210 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1211 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1212 Sym, ARMPCLabelIndex, 0);
1213 // Get the address of the callee into a register
1214 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1215 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1216 Callee = DAG.getLoad(getPointerTy(), dl,
1217 DAG.getEntryNode(), CPAddr,
1218 PseudoSourceValue::getConstantPool(), 0,
1221 } else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1222 const GlobalValue *GV = G->getGlobal();
1224 bool isExt = GV->isDeclaration() || GV->isWeakForLinker();
1225 bool isStub = (isExt && Subtarget->isTargetDarwin()) &&
1226 getTargetMachine().getRelocationModel() != Reloc::Static;
1227 isARMFunc = !Subtarget->isThumb() || isStub;
1228 // ARM call to a local ARM function is predicable.
1229 isLocalARMFunc = !Subtarget->isThumb() && (!isExt || !ARMInterworking);
1230 // tBX takes a register source operand.
1231 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1232 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1233 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV,
1236 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1237 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1238 Callee = DAG.getLoad(getPointerTy(), dl,
1239 DAG.getEntryNode(), CPAddr,
1240 PseudoSourceValue::getConstantPool(), 0,
1242 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1243 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1244 getPointerTy(), Callee, PICLabel);
1246 Callee = DAG.getTargetGlobalAddress(GV, dl, getPointerTy());
1247 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
1249 bool isStub = Subtarget->isTargetDarwin() &&
1250 getTargetMachine().getRelocationModel() != Reloc::Static;
1251 isARMFunc = !Subtarget->isThumb() || isStub;
1252 // tBX takes a register source operand.
1253 const char *Sym = S->getSymbol();
1254 if (isARMFunc && Subtarget->isThumb1Only() && !Subtarget->hasV5TOps()) {
1255 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1256 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1257 Sym, ARMPCLabelIndex, 4);
1258 SDValue CPAddr = DAG.getTargetConstantPool(CPV, getPointerTy(), 4);
1259 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1260 Callee = DAG.getLoad(getPointerTy(), dl,
1261 DAG.getEntryNode(), CPAddr,
1262 PseudoSourceValue::getConstantPool(), 0,
1264 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1265 Callee = DAG.getNode(ARMISD::PIC_ADD, dl,
1266 getPointerTy(), Callee, PICLabel);
1268 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy());
1271 // FIXME: handle tail calls differently.
1273 if (Subtarget->isThumb()) {
1274 if ((!isDirect || isARMFunc) && !Subtarget->hasV5TOps())
1275 CallOpc = ARMISD::CALL_NOLINK;
1277 CallOpc = isARMFunc ? ARMISD::CALL : ARMISD::tCALL;
1279 CallOpc = (isDirect || Subtarget->hasV5TOps())
1280 ? (isLocalARMFunc ? ARMISD::CALL_PRED : ARMISD::CALL)
1281 : ARMISD::CALL_NOLINK;
1283 if (CallOpc == ARMISD::CALL_NOLINK && !Subtarget->isThumb1Only()) {
1284 // implicit def LR - LR mustn't be allocated as GRP:$dst of CALL_NOLINK
1285 Chain = DAG.getCopyToReg(Chain, dl, ARM::LR, DAG.getUNDEF(MVT::i32),InFlag);
1286 InFlag = Chain.getValue(1);
1289 std::vector<SDValue> Ops;
1290 Ops.push_back(Chain);
1291 Ops.push_back(Callee);
1293 // Add argument registers to the end of the list so that they are known live
1295 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1296 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1297 RegsToPass[i].second.getValueType()));
1299 if (InFlag.getNode())
1300 Ops.push_back(InFlag);
1302 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag);
1304 return DAG.getNode(ARMISD::TC_RETURN, dl, NodeTys, &Ops[0], Ops.size());
1306 // Returns a chain and a flag for retval copy to use.
1307 Chain = DAG.getNode(CallOpc, dl, NodeTys, &Ops[0], Ops.size());
1308 InFlag = Chain.getValue(1);
1310 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
1311 DAG.getIntPtrConstant(0, true), InFlag);
1313 InFlag = Chain.getValue(1);
1315 // Handle result values, copying them out of physregs into vregs that we
1317 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins,
1321 /// MatchingStackOffset - Return true if the given stack call argument is
1322 /// already available in the same position (relatively) of the caller's
1323 /// incoming argument stack.
1325 bool MatchingStackOffset(SDValue Arg, unsigned Offset, ISD::ArgFlagsTy Flags,
1326 MachineFrameInfo *MFI, const MachineRegisterInfo *MRI,
1327 const ARMInstrInfo *TII) {
1328 unsigned Bytes = Arg.getValueType().getSizeInBits() / 8;
1330 if (Arg.getOpcode() == ISD::CopyFromReg) {
1331 unsigned VR = cast<RegisterSDNode>(Arg.getOperand(1))->getReg();
1332 if (!VR || TargetRegisterInfo::isPhysicalRegister(VR))
1334 MachineInstr *Def = MRI->getVRegDef(VR);
1337 if (!Flags.isByVal()) {
1338 if (!TII->isLoadFromStackSlot(Def, FI))
1341 // unsigned Opcode = Def->getOpcode();
1342 // if ((Opcode == X86::LEA32r || Opcode == X86::LEA64r) &&
1343 // Def->getOperand(1).isFI()) {
1344 // FI = Def->getOperand(1).getIndex();
1345 // Bytes = Flags.getByValSize();
1349 } else if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(Arg)) {
1350 if (Flags.isByVal())
1351 // ByVal argument is passed in as a pointer but it's now being
1352 // dereferenced. e.g.
1353 // define @foo(%struct.X* %A) {
1354 // tail call @bar(%struct.X* byval %A)
1357 SDValue Ptr = Ld->getBasePtr();
1358 FrameIndexSDNode *FINode = dyn_cast<FrameIndexSDNode>(Ptr);
1361 FI = FINode->getIndex();
1365 assert(FI != INT_MAX);
1366 if (!MFI->isFixedObjectIndex(FI))
1368 return Offset == MFI->getObjectOffset(FI) && Bytes == MFI->getObjectSize(FI);
1371 /// IsEligibleForTailCallOptimization - Check whether the call is eligible
1372 /// for tail call optimization. Targets which want to do tail call
1373 /// optimization should implement this function.
1375 ARMTargetLowering::IsEligibleForTailCallOptimization(SDValue Callee,
1376 CallingConv::ID CalleeCC,
1378 bool isCalleeStructRet,
1379 bool isCallerStructRet,
1380 const SmallVectorImpl<ISD::OutputArg> &Outs,
1381 const SmallVectorImpl<SDValue> &OutVals,
1382 const SmallVectorImpl<ISD::InputArg> &Ins,
1383 SelectionDAG& DAG) const {
1384 const Function *CallerF = DAG.getMachineFunction().getFunction();
1385 CallingConv::ID CallerCC = CallerF->getCallingConv();
1386 bool CCMatch = CallerCC == CalleeCC;
1388 // Look for obvious safe cases to perform tail call optimization that do not
1389 // require ABI changes. This is what gcc calls sibcall.
1391 // Do not sibcall optimize vararg calls unless the call site is not passing
1393 if (isVarArg && !Outs.empty())
1396 // Also avoid sibcall optimization if either caller or callee uses struct
1397 // return semantics.
1398 if (isCalleeStructRet || isCallerStructRet)
1401 // FIXME: Completely disable sibcall for Thumb1 since Thumb1RegisterInfo::
1402 // emitEpilogue is not ready for them.
1403 if (Subtarget->isThumb1Only())
1406 // For the moment, we can only do this to functions defined in this
1407 // compilation, or to indirect calls. A Thumb B to an ARM function,
1408 // or vice versa, is not easily fixed up in the linker unlike BL.
1409 // (We could do this by loading the address of the callee into a register;
1410 // that is an extra instruction over the direct call and burns a register
1411 // as well, so is not likely to be a win.)
1412 if (isa<ExternalSymbolSDNode>(Callee))
1415 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
1416 const GlobalValue *GV = G->getGlobal();
1417 if (GV->isDeclaration() || GV->isWeakForLinker())
1421 // If the calling conventions do not match, then we'd better make sure the
1422 // results are returned in the same way as what the caller expects.
1424 SmallVector<CCValAssign, 16> RVLocs1;
1425 CCState CCInfo1(CalleeCC, false, getTargetMachine(),
1426 RVLocs1, *DAG.getContext());
1427 CCInfo1.AnalyzeCallResult(Ins, CCAssignFnForNode(CalleeCC, true, isVarArg));
1429 SmallVector<CCValAssign, 16> RVLocs2;
1430 CCState CCInfo2(CallerCC, false, getTargetMachine(),
1431 RVLocs2, *DAG.getContext());
1432 CCInfo2.AnalyzeCallResult(Ins, CCAssignFnForNode(CallerCC, true, isVarArg));
1434 if (RVLocs1.size() != RVLocs2.size())
1436 for (unsigned i = 0, e = RVLocs1.size(); i != e; ++i) {
1437 if (RVLocs1[i].isRegLoc() != RVLocs2[i].isRegLoc())
1439 if (RVLocs1[i].getLocInfo() != RVLocs2[i].getLocInfo())
1441 if (RVLocs1[i].isRegLoc()) {
1442 if (RVLocs1[i].getLocReg() != RVLocs2[i].getLocReg())
1445 if (RVLocs1[i].getLocMemOffset() != RVLocs2[i].getLocMemOffset())
1451 // If the callee takes no arguments then go on to check the results of the
1453 if (!Outs.empty()) {
1454 // Check if stack adjustment is needed. For now, do not do this if any
1455 // argument is passed on the stack.
1456 SmallVector<CCValAssign, 16> ArgLocs;
1457 CCState CCInfo(CalleeCC, isVarArg, getTargetMachine(),
1458 ArgLocs, *DAG.getContext());
1459 CCInfo.AnalyzeCallOperands(Outs,
1460 CCAssignFnForNode(CalleeCC, false, isVarArg));
1461 if (CCInfo.getNextStackOffset()) {
1462 MachineFunction &MF = DAG.getMachineFunction();
1464 // Check if the arguments are already laid out in the right way as
1465 // the caller's fixed stack objects.
1466 MachineFrameInfo *MFI = MF.getFrameInfo();
1467 const MachineRegisterInfo *MRI = &MF.getRegInfo();
1468 const ARMInstrInfo *TII =
1469 ((ARMTargetMachine&)getTargetMachine()).getInstrInfo();
1470 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size();
1472 ++i, ++realArgIdx) {
1473 CCValAssign &VA = ArgLocs[i];
1474 EVT RegVT = VA.getLocVT();
1475 SDValue Arg = OutVals[realArgIdx];
1476 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
1477 if (VA.getLocInfo() == CCValAssign::Indirect)
1479 if (VA.needsCustom()) {
1480 // f64 and vector types are split into multiple registers or
1481 // register/stack-slot combinations. The types will not match
1482 // the registers; give up on memory f64 refs until we figure
1483 // out what to do about this.
1486 if (!ArgLocs[++i].isRegLoc())
1488 if (RegVT == MVT::v2f64) {
1489 if (!ArgLocs[++i].isRegLoc())
1491 if (!ArgLocs[++i].isRegLoc())
1494 } else if (!VA.isRegLoc()) {
1495 if (!MatchingStackOffset(Arg, VA.getLocMemOffset(), Flags,
1507 ARMTargetLowering::LowerReturn(SDValue Chain,
1508 CallingConv::ID CallConv, bool isVarArg,
1509 const SmallVectorImpl<ISD::OutputArg> &Outs,
1510 const SmallVectorImpl<SDValue> &OutVals,
1511 DebugLoc dl, SelectionDAG &DAG) const {
1513 // CCValAssign - represent the assignment of the return value to a location.
1514 SmallVector<CCValAssign, 16> RVLocs;
1516 // CCState - Info about the registers and stack slots.
1517 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs,
1520 // Analyze outgoing return values.
1521 CCInfo.AnalyzeReturn(Outs, CCAssignFnForNode(CallConv, /* Return */ true,
1524 // If this is the first return lowered for this function, add
1525 // the regs to the liveout set for the function.
1526 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
1527 for (unsigned i = 0; i != RVLocs.size(); ++i)
1528 if (RVLocs[i].isRegLoc())
1529 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
1534 // Copy the result values into the output registers.
1535 for (unsigned i = 0, realRVLocIdx = 0;
1537 ++i, ++realRVLocIdx) {
1538 CCValAssign &VA = RVLocs[i];
1539 assert(VA.isRegLoc() && "Can only return in registers!");
1541 SDValue Arg = OutVals[realRVLocIdx];
1543 switch (VA.getLocInfo()) {
1544 default: llvm_unreachable("Unknown loc info!");
1545 case CCValAssign::Full: break;
1546 case CCValAssign::BCvt:
1547 Arg = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getLocVT(), Arg);
1551 if (VA.needsCustom()) {
1552 if (VA.getLocVT() == MVT::v2f64) {
1553 // Extract the first half and return it in two registers.
1554 SDValue Half = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1555 DAG.getConstant(0, MVT::i32));
1556 SDValue HalfGPRs = DAG.getNode(ARMISD::VMOVRRD, dl,
1557 DAG.getVTList(MVT::i32, MVT::i32), Half);
1559 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), HalfGPRs, Flag);
1560 Flag = Chain.getValue(1);
1561 VA = RVLocs[++i]; // skip ahead to next loc
1562 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1563 HalfGPRs.getValue(1), Flag);
1564 Flag = Chain.getValue(1);
1565 VA = RVLocs[++i]; // skip ahead to next loc
1567 // Extract the 2nd half and fall through to handle it as an f64 value.
1568 Arg = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::f64, Arg,
1569 DAG.getConstant(1, MVT::i32));
1571 // Legalize ret f64 -> ret 2 x i32. We always have fmrrd if f64 is
1573 SDValue fmrrd = DAG.getNode(ARMISD::VMOVRRD, dl,
1574 DAG.getVTList(MVT::i32, MVT::i32), &Arg, 1);
1575 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd, Flag);
1576 Flag = Chain.getValue(1);
1577 VA = RVLocs[++i]; // skip ahead to next loc
1578 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), fmrrd.getValue(1),
1581 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), Arg, Flag);
1583 // Guarantee that all emitted copies are
1584 // stuck together, avoiding something bad.
1585 Flag = Chain.getValue(1);
1590 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain, Flag);
1592 result = DAG.getNode(ARMISD::RET_FLAG, dl, MVT::Other, Chain);
1597 // ConstantPool, JumpTable, GlobalAddress, and ExternalSymbol are lowered as
1598 // their target counterpart wrapped in the ARMISD::Wrapper node. Suppose N is
1599 // one of the above mentioned nodes. It has to be wrapped because otherwise
1600 // Select(N) returns N. So the raw TargetGlobalAddress nodes, etc. can only
1601 // be used to form addressing mode. These wrapped nodes will be selected
1603 static SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) {
1604 EVT PtrVT = Op.getValueType();
1605 // FIXME there is no actual debug info here
1606 DebugLoc dl = Op.getDebugLoc();
1607 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
1609 if (CP->isMachineConstantPoolEntry())
1610 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
1611 CP->getAlignment());
1613 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
1614 CP->getAlignment());
1615 return DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Res);
1618 SDValue ARMTargetLowering::LowerBlockAddress(SDValue Op,
1619 SelectionDAG &DAG) const {
1620 MachineFunction &MF = DAG.getMachineFunction();
1621 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1622 unsigned ARMPCLabelIndex = 0;
1623 DebugLoc DL = Op.getDebugLoc();
1624 EVT PtrVT = getPointerTy();
1625 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
1626 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1628 if (RelocM == Reloc::Static) {
1629 CPAddr = DAG.getTargetConstantPool(BA, PtrVT, 4);
1631 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1632 ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1633 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(BA, ARMPCLabelIndex,
1634 ARMCP::CPBlockAddress,
1636 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1638 CPAddr = DAG.getNode(ARMISD::Wrapper, DL, PtrVT, CPAddr);
1639 SDValue Result = DAG.getLoad(PtrVT, DL, DAG.getEntryNode(), CPAddr,
1640 PseudoSourceValue::getConstantPool(), 0,
1642 if (RelocM == Reloc::Static)
1644 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1645 return DAG.getNode(ARMISD::PIC_ADD, DL, PtrVT, Result, PICLabel);
1648 // Lower ISD::GlobalTLSAddress using the "general dynamic" model
1650 ARMTargetLowering::LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
1651 SelectionDAG &DAG) const {
1652 DebugLoc dl = GA->getDebugLoc();
1653 EVT PtrVT = getPointerTy();
1654 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1655 MachineFunction &MF = DAG.getMachineFunction();
1656 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1657 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1658 ARMConstantPoolValue *CPV =
1659 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1660 ARMCP::CPValue, PCAdj, "tlsgd", true);
1661 SDValue Argument = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1662 Argument = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Argument);
1663 Argument = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), Argument,
1664 PseudoSourceValue::getConstantPool(), 0,
1666 SDValue Chain = Argument.getValue(1);
1668 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1669 Argument = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Argument, PICLabel);
1671 // call __tls_get_addr.
1674 Entry.Node = Argument;
1675 Entry.Ty = (const Type *) Type::getInt32Ty(*DAG.getContext());
1676 Args.push_back(Entry);
1677 // FIXME: is there useful debug info available here?
1678 std::pair<SDValue, SDValue> CallResult =
1679 LowerCallTo(Chain, (const Type *) Type::getInt32Ty(*DAG.getContext()),
1680 false, false, false, false,
1681 0, CallingConv::C, false, /*isReturnValueUsed=*/true,
1682 DAG.getExternalSymbol("__tls_get_addr", PtrVT), Args, DAG, dl);
1683 return CallResult.first;
1686 // Lower ISD::GlobalTLSAddress using the "initial exec" or
1687 // "local exec" model.
1689 ARMTargetLowering::LowerToTLSExecModels(GlobalAddressSDNode *GA,
1690 SelectionDAG &DAG) const {
1691 const GlobalValue *GV = GA->getGlobal();
1692 DebugLoc dl = GA->getDebugLoc();
1694 SDValue Chain = DAG.getEntryNode();
1695 EVT PtrVT = getPointerTy();
1696 // Get the Thread Pointer
1697 SDValue ThreadPointer = DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
1699 if (GV->isDeclaration()) {
1700 MachineFunction &MF = DAG.getMachineFunction();
1701 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1702 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1703 // Initial exec model.
1704 unsigned char PCAdj = Subtarget->isThumb() ? 4 : 8;
1705 ARMConstantPoolValue *CPV =
1706 new ARMConstantPoolValue(GA->getGlobal(), ARMPCLabelIndex,
1707 ARMCP::CPValue, PCAdj, "gottpoff", true);
1708 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1709 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
1710 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1711 PseudoSourceValue::getConstantPool(), 0,
1713 Chain = Offset.getValue(1);
1715 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1716 Offset = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Offset, PICLabel);
1718 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1719 PseudoSourceValue::getConstantPool(), 0,
1723 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(GV, "tpoff");
1724 Offset = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1725 Offset = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, Offset);
1726 Offset = DAG.getLoad(PtrVT, dl, Chain, Offset,
1727 PseudoSourceValue::getConstantPool(), 0,
1731 // The address of the thread local variable is the add of the thread
1732 // pointer with the offset of the variable.
1733 return DAG.getNode(ISD::ADD, dl, PtrVT, ThreadPointer, Offset);
1737 ARMTargetLowering::LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const {
1738 // TODO: implement the "local dynamic" model
1739 assert(Subtarget->isTargetELF() &&
1740 "TLS not implemented for non-ELF targets");
1741 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
1742 // If the relocation model is PIC, use the "General Dynamic" TLS Model,
1743 // otherwise use the "Local Exec" TLS Model
1744 if (getTargetMachine().getRelocationModel() == Reloc::PIC_)
1745 return LowerToTLSGeneralDynamicModel(GA, DAG);
1747 return LowerToTLSExecModels(GA, DAG);
1750 SDValue ARMTargetLowering::LowerGlobalAddressELF(SDValue Op,
1751 SelectionDAG &DAG) const {
1752 EVT PtrVT = getPointerTy();
1753 DebugLoc dl = Op.getDebugLoc();
1754 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1755 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1756 if (RelocM == Reloc::PIC_) {
1757 bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility();
1758 ARMConstantPoolValue *CPV =
1759 new ARMConstantPoolValue(GV, UseGOTOFF ? "GOTOFF" : "GOT");
1760 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1761 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1762 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
1764 PseudoSourceValue::getConstantPool(), 0,
1766 SDValue Chain = Result.getValue(1);
1767 SDValue GOT = DAG.getGLOBAL_OFFSET_TABLE(PtrVT);
1768 Result = DAG.getNode(ISD::ADD, dl, PtrVT, Result, GOT);
1770 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
1771 PseudoSourceValue::getGOT(), 0,
1775 // If we have T2 ops, we can materialize the address directly via movt/movw
1776 // pair. This is always cheaper.
1777 if (Subtarget->useMovt()) {
1778 return DAG.getNode(ARMISD::Wrapper, dl, PtrVT,
1779 DAG.getTargetGlobalAddress(GV, dl, PtrVT));
1781 SDValue CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1782 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1783 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1784 PseudoSourceValue::getConstantPool(), 0,
1790 SDValue ARMTargetLowering::LowerGlobalAddressDarwin(SDValue Op,
1791 SelectionDAG &DAG) const {
1792 MachineFunction &MF = DAG.getMachineFunction();
1793 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1794 unsigned ARMPCLabelIndex = 0;
1795 EVT PtrVT = getPointerTy();
1796 DebugLoc dl = Op.getDebugLoc();
1797 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
1798 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1800 if (RelocM == Reloc::Static)
1801 CPAddr = DAG.getTargetConstantPool(GV, PtrVT, 4);
1803 ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1804 unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 : (Subtarget->isThumb()?4:8);
1805 ARMConstantPoolValue *CPV =
1806 new ARMConstantPoolValue(GV, ARMPCLabelIndex, ARMCP::CPValue, PCAdj);
1807 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1809 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1811 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1812 PseudoSourceValue::getConstantPool(), 0,
1814 SDValue Chain = Result.getValue(1);
1816 if (RelocM == Reloc::PIC_) {
1817 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1818 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1821 if (Subtarget->GVIsIndirectSymbol(GV, RelocM))
1822 Result = DAG.getLoad(PtrVT, dl, Chain, Result,
1823 PseudoSourceValue::getGOT(), 0,
1829 SDValue ARMTargetLowering::LowerGLOBAL_OFFSET_TABLE(SDValue Op,
1830 SelectionDAG &DAG) const {
1831 assert(Subtarget->isTargetELF() &&
1832 "GLOBAL OFFSET TABLE not implemented for non-ELF targets");
1833 MachineFunction &MF = DAG.getMachineFunction();
1834 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1835 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1836 EVT PtrVT = getPointerTy();
1837 DebugLoc dl = Op.getDebugLoc();
1838 unsigned PCAdj = Subtarget->isThumb() ? 4 : 8;
1839 ARMConstantPoolValue *CPV = new ARMConstantPoolValue(*DAG.getContext(),
1840 "_GLOBAL_OFFSET_TABLE_",
1841 ARMPCLabelIndex, PCAdj);
1842 SDValue CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1843 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1844 SDValue Result = DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1845 PseudoSourceValue::getConstantPool(), 0,
1847 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1848 return DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1852 ARMTargetLowering::LowerEH_SJLJ_SETJMP(SDValue Op, SelectionDAG &DAG) const {
1853 DebugLoc dl = Op.getDebugLoc();
1854 SDValue Val = DAG.getConstant(0, MVT::i32);
1855 return DAG.getNode(ARMISD::EH_SJLJ_SETJMP, dl, MVT::i32, Op.getOperand(0),
1856 Op.getOperand(1), Val);
1860 ARMTargetLowering::LowerEH_SJLJ_LONGJMP(SDValue Op, SelectionDAG &DAG) const {
1861 DebugLoc dl = Op.getDebugLoc();
1862 return DAG.getNode(ARMISD::EH_SJLJ_LONGJMP, dl, MVT::Other, Op.getOperand(0),
1863 Op.getOperand(1), DAG.getConstant(0, MVT::i32));
1867 ARMTargetLowering::LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG,
1868 const ARMSubtarget *Subtarget) const {
1869 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1870 DebugLoc dl = Op.getDebugLoc();
1872 default: return SDValue(); // Don't custom lower most intrinsics.
1873 case Intrinsic::arm_thread_pointer: {
1874 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1875 return DAG.getNode(ARMISD::THREAD_POINTER, dl, PtrVT);
1877 case Intrinsic::eh_sjlj_lsda: {
1878 MachineFunction &MF = DAG.getMachineFunction();
1879 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1880 unsigned ARMPCLabelIndex = AFI->createConstPoolEntryUId();
1881 EVT PtrVT = getPointerTy();
1882 DebugLoc dl = Op.getDebugLoc();
1883 Reloc::Model RelocM = getTargetMachine().getRelocationModel();
1885 unsigned PCAdj = (RelocM != Reloc::PIC_)
1886 ? 0 : (Subtarget->isThumb() ? 4 : 8);
1887 ARMConstantPoolValue *CPV =
1888 new ARMConstantPoolValue(MF.getFunction(), ARMPCLabelIndex,
1889 ARMCP::CPLSDA, PCAdj);
1890 CPAddr = DAG.getTargetConstantPool(CPV, PtrVT, 4);
1891 CPAddr = DAG.getNode(ARMISD::Wrapper, dl, MVT::i32, CPAddr);
1893 DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), CPAddr,
1894 PseudoSourceValue::getConstantPool(), 0,
1897 if (RelocM == Reloc::PIC_) {
1898 SDValue PICLabel = DAG.getConstant(ARMPCLabelIndex, MVT::i32);
1899 Result = DAG.getNode(ARMISD::PIC_ADD, dl, PtrVT, Result, PICLabel);
1906 static SDValue LowerMEMBARRIER(SDValue Op, SelectionDAG &DAG,
1907 const ARMSubtarget *Subtarget) {
1908 DebugLoc dl = Op.getDebugLoc();
1909 SDValue Op5 = Op.getOperand(5);
1910 unsigned isDeviceBarrier = cast<ConstantSDNode>(Op5)->getZExtValue();
1911 // v6 and v7 can both handle barriers directly, but need handled a bit
1912 // differently. Thumb1 and pre-v6 ARM mode use a libcall instead and should
1914 unsigned Opc = isDeviceBarrier ? ARMISD::SYNCBARRIER : ARMISD::MEMBARRIER;
1915 if (Subtarget->hasV7Ops())
1916 return DAG.getNode(Opc, dl, MVT::Other, Op.getOperand(0));
1917 else if (Subtarget->hasV6Ops() && !Subtarget->isThumb1Only())
1918 return DAG.getNode(Opc, dl, MVT::Other, Op.getOperand(0),
1919 DAG.getConstant(0, MVT::i32));
1920 assert(0 && "Unexpected ISD::MEMBARRIER encountered. Should be libcall!");
1924 static SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) {
1925 MachineFunction &MF = DAG.getMachineFunction();
1926 ARMFunctionInfo *FuncInfo = MF.getInfo<ARMFunctionInfo>();
1928 // vastart just stores the address of the VarArgsFrameIndex slot into the
1929 // memory location argument.
1930 DebugLoc dl = Op.getDebugLoc();
1931 EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
1932 SDValue FR = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
1933 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1934 return DAG.getStore(Op.getOperand(0), dl, FR, Op.getOperand(1), SV, 0,
1939 ARMTargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
1940 SelectionDAG &DAG) const {
1941 SDNode *Node = Op.getNode();
1942 DebugLoc dl = Node->getDebugLoc();
1943 EVT VT = Node->getValueType(0);
1944 SDValue Chain = Op.getOperand(0);
1945 SDValue Size = Op.getOperand(1);
1946 SDValue Align = Op.getOperand(2);
1948 // Chain the dynamic stack allocation so that it doesn't modify the stack
1949 // pointer when other instructions are using the stack.
1950 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
1952 unsigned AlignVal = cast<ConstantSDNode>(Align)->getZExtValue();
1953 unsigned StackAlign = getTargetMachine().getFrameInfo()->getStackAlignment();
1954 if (AlignVal > StackAlign)
1955 // Do this now since selection pass cannot introduce new target
1956 // independent node.
1957 Align = DAG.getConstant(-(uint64_t)AlignVal, VT);
1959 // In Thumb1 mode, there isn't a "sub r, sp, r" instruction, we will end up
1960 // using a "add r, sp, r" instead. Negate the size now so we don't have to
1961 // do even more horrible hack later.
1962 MachineFunction &MF = DAG.getMachineFunction();
1963 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1964 if (AFI->isThumb1OnlyFunction()) {
1966 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Size);
1968 uint32_t Val = C->getZExtValue();
1969 if (Val <= 508 && ((Val & 3) == 0))
1973 Size = DAG.getNode(ISD::SUB, dl, VT, DAG.getConstant(0, VT), Size);
1976 SDVTList VTList = DAG.getVTList(VT, MVT::Other);
1977 SDValue Ops1[] = { Chain, Size, Align };
1978 SDValue Res = DAG.getNode(ARMISD::DYN_ALLOC, dl, VTList, Ops1, 3);
1979 Chain = Res.getValue(1);
1980 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true),
1981 DAG.getIntPtrConstant(0, true), SDValue());
1982 SDValue Ops2[] = { Res, Chain };
1983 return DAG.getMergeValues(Ops2, 2, dl);
1987 ARMTargetLowering::GetF64FormalArgument(CCValAssign &VA, CCValAssign &NextVA,
1988 SDValue &Root, SelectionDAG &DAG,
1989 DebugLoc dl) const {
1990 MachineFunction &MF = DAG.getMachineFunction();
1991 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1993 TargetRegisterClass *RC;
1994 if (AFI->isThumb1OnlyFunction())
1995 RC = ARM::tGPRRegisterClass;
1997 RC = ARM::GPRRegisterClass;
1999 // Transform the arguments stored in physical registers into virtual ones.
2000 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
2001 SDValue ArgValue = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
2004 if (NextVA.isMemLoc()) {
2005 MachineFrameInfo *MFI = MF.getFrameInfo();
2006 int FI = MFI->CreateFixedObject(4, NextVA.getLocMemOffset(), true);
2008 // Create load node to retrieve arguments from the stack.
2009 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
2010 ArgValue2 = DAG.getLoad(MVT::i32, dl, Root, FIN,
2011 PseudoSourceValue::getFixedStack(FI), 0,
2014 Reg = MF.addLiveIn(NextVA.getLocReg(), RC);
2015 ArgValue2 = DAG.getCopyFromReg(Root, dl, Reg, MVT::i32);
2018 return DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, ArgValue, ArgValue2);
2022 ARMTargetLowering::LowerFormalArguments(SDValue Chain,
2023 CallingConv::ID CallConv, bool isVarArg,
2024 const SmallVectorImpl<ISD::InputArg>
2026 DebugLoc dl, SelectionDAG &DAG,
2027 SmallVectorImpl<SDValue> &InVals)
2030 MachineFunction &MF = DAG.getMachineFunction();
2031 MachineFrameInfo *MFI = MF.getFrameInfo();
2033 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
2035 // Assign locations to all of the incoming arguments.
2036 SmallVector<CCValAssign, 16> ArgLocs;
2037 CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs,
2039 CCInfo.AnalyzeFormalArguments(Ins,
2040 CCAssignFnForNode(CallConv, /* Return*/ false,
2043 SmallVector<SDValue, 16> ArgValues;
2045 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
2046 CCValAssign &VA = ArgLocs[i];
2048 // Arguments stored in registers.
2049 if (VA.isRegLoc()) {
2050 EVT RegVT = VA.getLocVT();
2053 if (VA.needsCustom()) {
2054 // f64 and vector types are split up into multiple registers or
2055 // combinations of registers and stack slots.
2056 if (VA.getLocVT() == MVT::v2f64) {
2057 SDValue ArgValue1 = GetF64FormalArgument(VA, ArgLocs[++i],
2059 VA = ArgLocs[++i]; // skip ahead to next loc
2061 if (VA.isMemLoc()) {
2062 int FI = MFI->CreateFixedObject(8, VA.getLocMemOffset(), true);
2063 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
2064 ArgValue2 = DAG.getLoad(MVT::f64, dl, Chain, FIN,
2065 PseudoSourceValue::getFixedStack(FI), 0,
2068 ArgValue2 = GetF64FormalArgument(VA, ArgLocs[++i],
2071 ArgValue = DAG.getNode(ISD::UNDEF, dl, MVT::v2f64);
2072 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
2073 ArgValue, ArgValue1, DAG.getIntPtrConstant(0));
2074 ArgValue = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64,
2075 ArgValue, ArgValue2, DAG.getIntPtrConstant(1));
2077 ArgValue = GetF64FormalArgument(VA, ArgLocs[++i], Chain, DAG, dl);
2080 TargetRegisterClass *RC;
2082 if (RegVT == MVT::f32)
2083 RC = ARM::SPRRegisterClass;
2084 else if (RegVT == MVT::f64)
2085 RC = ARM::DPRRegisterClass;
2086 else if (RegVT == MVT::v2f64)
2087 RC = ARM::QPRRegisterClass;
2088 else if (RegVT == MVT::i32)
2089 RC = (AFI->isThumb1OnlyFunction() ?
2090 ARM::tGPRRegisterClass : ARM::GPRRegisterClass);
2092 llvm_unreachable("RegVT not supported by FORMAL_ARGUMENTS Lowering");
2094 // Transform the arguments in physical registers into virtual ones.
2095 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
2096 ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, RegVT);
2099 // If this is an 8 or 16-bit value, it is really passed promoted
2100 // to 32 bits. Insert an assert[sz]ext to capture this, then
2101 // truncate to the right size.
2102 switch (VA.getLocInfo()) {
2103 default: llvm_unreachable("Unknown loc info!");
2104 case CCValAssign::Full: break;
2105 case CCValAssign::BCvt:
2106 ArgValue = DAG.getNode(ISD::BIT_CONVERT, dl, VA.getValVT(), ArgValue);
2108 case CCValAssign::SExt:
2109 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
2110 DAG.getValueType(VA.getValVT()));
2111 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
2113 case CCValAssign::ZExt:
2114 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
2115 DAG.getValueType(VA.getValVT()));
2116 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
2120 InVals.push_back(ArgValue);
2122 } else { // VA.isRegLoc()
2125 assert(VA.isMemLoc());
2126 assert(VA.getValVT() != MVT::i64 && "i64 should already be lowered");
2128 unsigned ArgSize = VA.getLocVT().getSizeInBits()/8;
2129 int FI = MFI->CreateFixedObject(ArgSize, VA.getLocMemOffset(), true);
2131 // Create load nodes to retrieve arguments from the stack.
2132 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
2133 InVals.push_back(DAG.getLoad(VA.getValVT(), dl, Chain, FIN,
2134 PseudoSourceValue::getFixedStack(FI), 0,
2141 static const unsigned GPRArgRegs[] = {
2142 ARM::R0, ARM::R1, ARM::R2, ARM::R3
2145 unsigned NumGPRs = CCInfo.getFirstUnallocated
2146 (GPRArgRegs, sizeof(GPRArgRegs) / sizeof(GPRArgRegs[0]));
2148 unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
2149 unsigned VARegSize = (4 - NumGPRs) * 4;
2150 unsigned VARegSaveSize = (VARegSize + Align - 1) & ~(Align - 1);
2151 unsigned ArgOffset = CCInfo.getNextStackOffset();
2152 if (VARegSaveSize) {
2153 // If this function is vararg, store any remaining integer argument regs
2154 // to their spots on the stack so that they may be loaded by deferencing
2155 // the result of va_next.
2156 AFI->setVarArgsRegSaveSize(VARegSaveSize);
2157 AFI->setVarArgsFrameIndex(
2158 MFI->CreateFixedObject(VARegSaveSize,
2159 ArgOffset + VARegSaveSize - VARegSize,
2161 SDValue FIN = DAG.getFrameIndex(AFI->getVarArgsFrameIndex(),
2164 SmallVector<SDValue, 4> MemOps;
2165 for (; NumGPRs < 4; ++NumGPRs) {
2166 TargetRegisterClass *RC;
2167 if (AFI->isThumb1OnlyFunction())
2168 RC = ARM::tGPRRegisterClass;
2170 RC = ARM::GPRRegisterClass;
2172 unsigned VReg = MF.addLiveIn(GPRArgRegs[NumGPRs], RC);
2173 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
2175 DAG.getStore(Val.getValue(1), dl, Val, FIN,
2176 PseudoSourceValue::getFixedStack(AFI->getVarArgsFrameIndex()),
2177 0, false, false, 0);
2178 MemOps.push_back(Store);
2179 FIN = DAG.getNode(ISD::ADD, dl, getPointerTy(), FIN,
2180 DAG.getConstant(4, getPointerTy()));
2182 if (!MemOps.empty())
2183 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
2184 &MemOps[0], MemOps.size());
2186 // This will point to the next argument passed via stack.
2187 AFI->setVarArgsFrameIndex(MFI->CreateFixedObject(4, ArgOffset, true));
2193 /// isFloatingPointZero - Return true if this is +0.0.
2194 static bool isFloatingPointZero(SDValue Op) {
2195 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(Op))
2196 return CFP->getValueAPF().isPosZero();
2197 else if (ISD::isEXTLoad(Op.getNode()) || ISD::isNON_EXTLoad(Op.getNode())) {
2198 // Maybe this has already been legalized into the constant pool?
2199 if (Op.getOperand(1).getOpcode() == ARMISD::Wrapper) {
2200 SDValue WrapperOp = Op.getOperand(1).getOperand(0);
2201 if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(WrapperOp))
2202 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CP->getConstVal()))
2203 return CFP->getValueAPF().isPosZero();
2209 /// Returns appropriate ARM CMP (cmp) and corresponding condition code for
2210 /// the given operands.
2212 ARMTargetLowering::getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
2213 SDValue &ARMCC, SelectionDAG &DAG,
2214 DebugLoc dl) const {
2215 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
2216 unsigned C = RHSC->getZExtValue();
2217 if (!isLegalICmpImmediate(C)) {
2218 // Constant does not fit, try adjusting it by one?
2223 if (isLegalICmpImmediate(C-1)) {
2224 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
2225 RHS = DAG.getConstant(C-1, MVT::i32);
2230 if (C > 0 && isLegalICmpImmediate(C-1)) {
2231 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
2232 RHS = DAG.getConstant(C-1, MVT::i32);
2237 if (isLegalICmpImmediate(C+1)) {
2238 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
2239 RHS = DAG.getConstant(C+1, MVT::i32);
2244 if (C < 0xffffffff && isLegalICmpImmediate(C+1)) {
2245 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
2246 RHS = DAG.getConstant(C+1, MVT::i32);
2253 ARMCC::CondCodes CondCode = IntCCToARMCC(CC);
2254 ARMISD::NodeType CompareType;
2257 CompareType = ARMISD::CMP;
2262 CompareType = ARMISD::CMPZ;
2265 ARMCC = DAG.getConstant(CondCode, MVT::i32);
2266 return DAG.getNode(CompareType, dl, MVT::Flag, LHS, RHS);
2269 /// Returns a appropriate VFP CMP (fcmp{s|d}+fmstat) for the given operands.
2270 static SDValue getVFPCmp(SDValue LHS, SDValue RHS, SelectionDAG &DAG,
2273 if (!isFloatingPointZero(RHS))
2274 Cmp = DAG.getNode(ARMISD::CMPFP, dl, MVT::Flag, LHS, RHS);
2276 Cmp = DAG.getNode(ARMISD::CMPFPw0, dl, MVT::Flag, LHS);
2277 return DAG.getNode(ARMISD::FMSTAT, dl, MVT::Flag, Cmp);
2280 SDValue ARMTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const {
2281 EVT VT = Op.getValueType();
2282 SDValue LHS = Op.getOperand(0);
2283 SDValue RHS = Op.getOperand(1);
2284 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
2285 SDValue TrueVal = Op.getOperand(2);
2286 SDValue FalseVal = Op.getOperand(3);
2287 DebugLoc dl = Op.getDebugLoc();
2289 if (LHS.getValueType() == MVT::i32) {
2291 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2292 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, dl);
2293 return DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC, CCR,Cmp);
2296 ARMCC::CondCodes CondCode, CondCode2;
2297 FPCCToARMCC(CC, CondCode, CondCode2);
2299 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
2300 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2301 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
2302 SDValue Result = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal,
2304 if (CondCode2 != ARMCC::AL) {
2305 SDValue ARMCC2 = DAG.getConstant(CondCode2, MVT::i32);
2306 // FIXME: Needs another CMP because flag can have but one use.
2307 SDValue Cmp2 = getVFPCmp(LHS, RHS, DAG, dl);
2308 Result = DAG.getNode(ARMISD::CMOV, dl, VT,
2309 Result, TrueVal, ARMCC2, CCR, Cmp2);
2314 SDValue ARMTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
2315 SDValue Chain = Op.getOperand(0);
2316 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
2317 SDValue LHS = Op.getOperand(2);
2318 SDValue RHS = Op.getOperand(3);
2319 SDValue Dest = Op.getOperand(4);
2320 DebugLoc dl = Op.getDebugLoc();
2322 if (LHS.getValueType() == MVT::i32) {
2324 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2325 SDValue Cmp = getARMCmp(LHS, RHS, CC, ARMCC, DAG, dl);
2326 return DAG.getNode(ARMISD::BRCOND, dl, MVT::Other,
2327 Chain, Dest, ARMCC, CCR,Cmp);
2330 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
2331 ARMCC::CondCodes CondCode, CondCode2;
2332 FPCCToARMCC(CC, CondCode, CondCode2);
2334 SDValue Cmp = getVFPCmp(LHS, RHS, DAG, dl);
2335 SDValue ARMCC = DAG.getConstant(CondCode, MVT::i32);
2336 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2337 SDVTList VTList = DAG.getVTList(MVT::Other, MVT::Flag);
2338 SDValue Ops[] = { Chain, Dest, ARMCC, CCR, Cmp };
2339 SDValue Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
2340 if (CondCode2 != ARMCC::AL) {
2341 ARMCC = DAG.getConstant(CondCode2, MVT::i32);
2342 SDValue Ops[] = { Res, Dest, ARMCC, CCR, Res.getValue(1) };
2343 Res = DAG.getNode(ARMISD::BRCOND, dl, VTList, Ops, 5);
2348 SDValue ARMTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) const {
2349 SDValue Chain = Op.getOperand(0);
2350 SDValue Table = Op.getOperand(1);
2351 SDValue Index = Op.getOperand(2);
2352 DebugLoc dl = Op.getDebugLoc();
2354 EVT PTy = getPointerTy();
2355 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
2356 ARMFunctionInfo *AFI = DAG.getMachineFunction().getInfo<ARMFunctionInfo>();
2357 SDValue UId = DAG.getConstant(AFI->createJumpTableUId(), PTy);
2358 SDValue JTI = DAG.getTargetJumpTable(JT->getIndex(), PTy);
2359 Table = DAG.getNode(ARMISD::WrapperJT, dl, MVT::i32, JTI, UId);
2360 Index = DAG.getNode(ISD::MUL, dl, PTy, Index, DAG.getConstant(4, PTy));
2361 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
2362 if (Subtarget->isThumb2()) {
2363 // Thumb2 uses a two-level jump. That is, it jumps into the jump table
2364 // which does another jump to the destination. This also makes it easier
2365 // to translate it to TBB / TBH later.
2366 // FIXME: This might not work if the function is extremely large.
2367 return DAG.getNode(ARMISD::BR2_JT, dl, MVT::Other, Chain,
2368 Addr, Op.getOperand(2), JTI, UId);
2370 if (getTargetMachine().getRelocationModel() == Reloc::PIC_) {
2371 Addr = DAG.getLoad((EVT)MVT::i32, dl, Chain, Addr,
2372 PseudoSourceValue::getJumpTable(), 0,
2374 Chain = Addr.getValue(1);
2375 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr, Table);
2376 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
2378 Addr = DAG.getLoad(PTy, dl, Chain, Addr,
2379 PseudoSourceValue::getJumpTable(), 0, false, false, 0);
2380 Chain = Addr.getValue(1);
2381 return DAG.getNode(ARMISD::BR_JT, dl, MVT::Other, Chain, Addr, JTI, UId);
2385 static SDValue LowerFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
2386 DebugLoc dl = Op.getDebugLoc();
2389 switch (Op.getOpcode()) {
2391 assert(0 && "Invalid opcode!");
2392 case ISD::FP_TO_SINT:
2393 Opc = ARMISD::FTOSI;
2395 case ISD::FP_TO_UINT:
2396 Opc = ARMISD::FTOUI;
2399 Op = DAG.getNode(Opc, dl, MVT::f32, Op.getOperand(0));
2400 return DAG.getNode(ISD::BIT_CONVERT, dl, MVT::i32, Op);
2403 static SDValue LowerINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
2404 EVT VT = Op.getValueType();
2405 DebugLoc dl = Op.getDebugLoc();
2408 switch (Op.getOpcode()) {
2410 assert(0 && "Invalid opcode!");
2411 case ISD::SINT_TO_FP:
2412 Opc = ARMISD::SITOF;
2414 case ISD::UINT_TO_FP:
2415 Opc = ARMISD::UITOF;
2419 Op = DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f32, Op.getOperand(0));
2420 return DAG.getNode(Opc, dl, VT, Op);
2423 static SDValue LowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) {
2424 // Implement fcopysign with a fabs and a conditional fneg.
2425 SDValue Tmp0 = Op.getOperand(0);
2426 SDValue Tmp1 = Op.getOperand(1);
2427 DebugLoc dl = Op.getDebugLoc();
2428 EVT VT = Op.getValueType();
2429 EVT SrcVT = Tmp1.getValueType();
2430 SDValue AbsVal = DAG.getNode(ISD::FABS, dl, VT, Tmp0);
2431 SDValue Cmp = getVFPCmp(Tmp1, DAG.getConstantFP(0.0, SrcVT), DAG, dl);
2432 SDValue ARMCC = DAG.getConstant(ARMCC::LT, MVT::i32);
2433 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2434 return DAG.getNode(ARMISD::CNEG, dl, VT, AbsVal, AbsVal, ARMCC, CCR, Cmp);
2437 SDValue ARMTargetLowering::LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const{
2438 MachineFunction &MF = DAG.getMachineFunction();
2439 MachineFrameInfo *MFI = MF.getFrameInfo();
2440 MFI->setReturnAddressIsTaken(true);
2442 EVT VT = Op.getValueType();
2443 DebugLoc dl = Op.getDebugLoc();
2444 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
2446 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
2447 SDValue Offset = DAG.getConstant(4, MVT::i32);
2448 return DAG.getLoad(VT, dl, DAG.getEntryNode(),
2449 DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset),
2450 NULL, 0, false, false, 0);
2453 // Return LR, which contains the return address. Mark it an implicit live-in.
2454 unsigned Reg = MF.addLiveIn(ARM::LR, ARM::GPRRegisterClass);
2455 return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
2458 SDValue ARMTargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
2459 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
2460 MFI->setFrameAddressIsTaken(true);
2462 EVT VT = Op.getValueType();
2463 DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful
2464 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
2465 unsigned FrameReg = (Subtarget->isThumb() || Subtarget->isTargetDarwin())
2466 ? ARM::R7 : ARM::R11;
2467 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
2469 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr, NULL, 0,
2474 /// ExpandBIT_CONVERT - If the target supports VFP, this function is called to
2475 /// expand a bit convert where either the source or destination type is i64 to
2476 /// use a VMOVDRR or VMOVRRD node. This should not be done when the non-i64
2477 /// operand type is illegal (e.g., v2f32 for a target that doesn't support
2478 /// vectors), since the legalizer won't know what to do with that.
2479 static SDValue ExpandBIT_CONVERT(SDNode *N, SelectionDAG &DAG) {
2480 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2481 DebugLoc dl = N->getDebugLoc();
2482 SDValue Op = N->getOperand(0);
2484 // This function is only supposed to be called for i64 types, either as the
2485 // source or destination of the bit convert.
2486 EVT SrcVT = Op.getValueType();
2487 EVT DstVT = N->getValueType(0);
2488 assert((SrcVT == MVT::i64 || DstVT == MVT::i64) &&
2489 "ExpandBIT_CONVERT called for non-i64 type");
2491 // Turn i64->f64 into VMOVDRR.
2492 if (SrcVT == MVT::i64 && TLI.isTypeLegal(DstVT)) {
2493 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
2494 DAG.getConstant(0, MVT::i32));
2495 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, Op,
2496 DAG.getConstant(1, MVT::i32));
2497 return DAG.getNode(ISD::BIT_CONVERT, dl, DstVT,
2498 DAG.getNode(ARMISD::VMOVDRR, dl, MVT::f64, Lo, Hi));
2501 // Turn f64->i64 into VMOVRRD.
2502 if (DstVT == MVT::i64 && TLI.isTypeLegal(SrcVT)) {
2503 SDValue Cvt = DAG.getNode(ARMISD::VMOVRRD, dl,
2504 DAG.getVTList(MVT::i32, MVT::i32), &Op, 1);
2505 // Merge the pieces into a single i64 value.
2506 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Cvt, Cvt.getValue(1));
2512 /// getZeroVector - Returns a vector of specified type with all zero elements.
2514 static SDValue getZeroVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2515 assert(VT.isVector() && "Expected a vector type");
2517 // Zero vectors are used to represent vector negation and in those cases
2518 // will be implemented with the NEON VNEG instruction. However, VNEG does
2519 // not support i64 elements, so sometimes the zero vectors will need to be
2520 // explicitly constructed. For those cases, and potentially other uses in
2521 // the future, always build zero vectors as <16 x i8> or <8 x i8> bitcasted
2522 // to their dest type. This ensures they get CSE'd.
2524 SDValue Cst = DAG.getTargetConstant(0, MVT::i8);
2525 SmallVector<SDValue, 8> Ops;
2528 if (VT.getSizeInBits() == 64) {
2529 Ops.assign(8, Cst); TVT = MVT::v8i8;
2531 Ops.assign(16, Cst); TVT = MVT::v16i8;
2533 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size());
2535 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec);
2538 /// getOnesVector - Returns a vector of specified type with all bits set.
2540 static SDValue getOnesVector(EVT VT, SelectionDAG &DAG, DebugLoc dl) {
2541 assert(VT.isVector() && "Expected a vector type");
2543 // Always build ones vectors as <16 x i8> or <8 x i8> bitcasted to their
2544 // dest type. This ensures they get CSE'd.
2546 SDValue Cst = DAG.getTargetConstant(0xFF, MVT::i8);
2547 SmallVector<SDValue, 8> Ops;
2550 if (VT.getSizeInBits() == 64) {
2551 Ops.assign(8, Cst); TVT = MVT::v8i8;
2553 Ops.assign(16, Cst); TVT = MVT::v16i8;
2555 Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, TVT, &Ops[0], Ops.size());
2557 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Vec);
2560 /// LowerShiftRightParts - Lower SRA_PARTS, which returns two
2561 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
2562 SDValue ARMTargetLowering::LowerShiftRightParts(SDValue Op,
2563 SelectionDAG &DAG) const {
2564 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
2565 EVT VT = Op.getValueType();
2566 unsigned VTBits = VT.getSizeInBits();
2567 DebugLoc dl = Op.getDebugLoc();
2568 SDValue ShOpLo = Op.getOperand(0);
2569 SDValue ShOpHi = Op.getOperand(1);
2570 SDValue ShAmt = Op.getOperand(2);
2572 unsigned Opc = (Op.getOpcode() == ISD::SRA_PARTS) ? ISD::SRA : ISD::SRL;
2574 assert(Op.getOpcode() == ISD::SRA_PARTS || Op.getOpcode() == ISD::SRL_PARTS);
2576 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
2577 DAG.getConstant(VTBits, MVT::i32), ShAmt);
2578 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, ShAmt);
2579 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
2580 DAG.getConstant(VTBits, MVT::i32));
2581 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, RevShAmt);
2582 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2583 SDValue TrueVal = DAG.getNode(Opc, dl, VT, ShOpHi, ExtraShAmt);
2585 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2586 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
2588 SDValue Hi = DAG.getNode(Opc, dl, VT, ShOpHi, ShAmt);
2589 SDValue Lo = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, TrueVal, ARMCC,
2592 SDValue Ops[2] = { Lo, Hi };
2593 return DAG.getMergeValues(Ops, 2, dl);
2596 /// LowerShiftLeftParts - Lower SHL_PARTS, which returns two
2597 /// i32 values and take a 2 x i32 value to shift plus a shift amount.
2598 SDValue ARMTargetLowering::LowerShiftLeftParts(SDValue Op,
2599 SelectionDAG &DAG) const {
2600 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
2601 EVT VT = Op.getValueType();
2602 unsigned VTBits = VT.getSizeInBits();
2603 DebugLoc dl = Op.getDebugLoc();
2604 SDValue ShOpLo = Op.getOperand(0);
2605 SDValue ShOpHi = Op.getOperand(1);
2606 SDValue ShAmt = Op.getOperand(2);
2609 assert(Op.getOpcode() == ISD::SHL_PARTS);
2610 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32,
2611 DAG.getConstant(VTBits, MVT::i32), ShAmt);
2612 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, RevShAmt);
2613 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i32, ShAmt,
2614 DAG.getConstant(VTBits, MVT::i32));
2615 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, ShAmt);
2616 SDValue Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ExtraShAmt);
2618 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2619 SDValue CCR = DAG.getRegister(ARM::CPSR, MVT::i32);
2620 SDValue Cmp = getARMCmp(ExtraShAmt, DAG.getConstant(0, MVT::i32), ISD::SETGE,
2622 SDValue Lo = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt);
2623 SDValue Hi = DAG.getNode(ARMISD::CMOV, dl, VT, FalseVal, Tmp3, ARMCC,
2626 SDValue Ops[2] = { Lo, Hi };
2627 return DAG.getMergeValues(Ops, 2, dl);
2630 static SDValue LowerCTTZ(SDNode *N, SelectionDAG &DAG,
2631 const ARMSubtarget *ST) {
2632 EVT VT = N->getValueType(0);
2633 DebugLoc dl = N->getDebugLoc();
2635 if (!ST->hasV6T2Ops())
2638 SDValue rbit = DAG.getNode(ARMISD::RBIT, dl, VT, N->getOperand(0));
2639 return DAG.getNode(ISD::CTLZ, dl, VT, rbit);
2642 static SDValue LowerShift(SDNode *N, SelectionDAG &DAG,
2643 const ARMSubtarget *ST) {
2644 EVT VT = N->getValueType(0);
2645 DebugLoc dl = N->getDebugLoc();
2647 // Lower vector shifts on NEON to use VSHL.
2648 if (VT.isVector()) {
2649 assert(ST->hasNEON() && "unexpected vector shift");
2651 // Left shifts translate directly to the vshiftu intrinsic.
2652 if (N->getOpcode() == ISD::SHL)
2653 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
2654 DAG.getConstant(Intrinsic::arm_neon_vshiftu, MVT::i32),
2655 N->getOperand(0), N->getOperand(1));
2657 assert((N->getOpcode() == ISD::SRA ||
2658 N->getOpcode() == ISD::SRL) && "unexpected vector shift opcode");
2660 // NEON uses the same intrinsics for both left and right shifts. For
2661 // right shifts, the shift amounts are negative, so negate the vector of
2663 EVT ShiftVT = N->getOperand(1).getValueType();
2664 SDValue NegatedCount = DAG.getNode(ISD::SUB, dl, ShiftVT,
2665 getZeroVector(ShiftVT, DAG, dl),
2667 Intrinsic::ID vshiftInt = (N->getOpcode() == ISD::SRA ?
2668 Intrinsic::arm_neon_vshifts :
2669 Intrinsic::arm_neon_vshiftu);
2670 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, VT,
2671 DAG.getConstant(vshiftInt, MVT::i32),
2672 N->getOperand(0), NegatedCount);
2675 // We can get here for a node like i32 = ISD::SHL i32, i64
2679 assert((N->getOpcode() == ISD::SRL || N->getOpcode() == ISD::SRA) &&
2680 "Unknown shift to lower!");
2682 // We only lower SRA, SRL of 1 here, all others use generic lowering.
2683 if (!isa<ConstantSDNode>(N->getOperand(1)) ||
2684 cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() != 1)
2687 // If we are in thumb mode, we don't have RRX.
2688 if (ST->isThumb1Only()) return SDValue();
2690 // Okay, we have a 64-bit SRA or SRL of 1. Lower this to an RRX expr.
2691 SDValue Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
2692 DAG.getConstant(0, MVT::i32));
2693 SDValue Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, N->getOperand(0),
2694 DAG.getConstant(1, MVT::i32));
2696 // First, build a SRA_FLAG/SRL_FLAG op, which shifts the top part by one and
2697 // captures the result into a carry flag.
2698 unsigned Opc = N->getOpcode() == ISD::SRL ? ARMISD::SRL_FLAG:ARMISD::SRA_FLAG;
2699 Hi = DAG.getNode(Opc, dl, DAG.getVTList(MVT::i32, MVT::Flag), &Hi, 1);
2701 // The low part is an ARMISD::RRX operand, which shifts the carry in.
2702 Lo = DAG.getNode(ARMISD::RRX, dl, MVT::i32, Lo, Hi.getValue(1));
2704 // Merge the pieces into a single i64 value.
2705 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
2708 static SDValue LowerVSETCC(SDValue Op, SelectionDAG &DAG) {
2709 SDValue TmpOp0, TmpOp1;
2710 bool Invert = false;
2714 SDValue Op0 = Op.getOperand(0);
2715 SDValue Op1 = Op.getOperand(1);
2716 SDValue CC = Op.getOperand(2);
2717 EVT VT = Op.getValueType();
2718 ISD::CondCode SetCCOpcode = cast<CondCodeSDNode>(CC)->get();
2719 DebugLoc dl = Op.getDebugLoc();
2721 if (Op.getOperand(1).getValueType().isFloatingPoint()) {
2722 switch (SetCCOpcode) {
2723 default: llvm_unreachable("Illegal FP comparison"); break;
2725 case ISD::SETNE: Invert = true; // Fallthrough
2727 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
2729 case ISD::SETLT: Swap = true; // Fallthrough
2731 case ISD::SETGT: Opc = ARMISD::VCGT; break;
2733 case ISD::SETLE: Swap = true; // Fallthrough
2735 case ISD::SETGE: Opc = ARMISD::VCGE; break;
2736 case ISD::SETUGE: Swap = true; // Fallthrough
2737 case ISD::SETULE: Invert = true; Opc = ARMISD::VCGT; break;
2738 case ISD::SETUGT: Swap = true; // Fallthrough
2739 case ISD::SETULT: Invert = true; Opc = ARMISD::VCGE; break;
2740 case ISD::SETUEQ: Invert = true; // Fallthrough
2742 // Expand this to (OLT | OGT).
2746 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
2747 Op1 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp0, TmpOp1);
2749 case ISD::SETUO: Invert = true; // Fallthrough
2751 // Expand this to (OLT | OGE).
2755 Op0 = DAG.getNode(ARMISD::VCGT, dl, VT, TmpOp1, TmpOp0);
2756 Op1 = DAG.getNode(ARMISD::VCGE, dl, VT, TmpOp0, TmpOp1);
2760 // Integer comparisons.
2761 switch (SetCCOpcode) {
2762 default: llvm_unreachable("Illegal integer comparison"); break;
2763 case ISD::SETNE: Invert = true;
2764 case ISD::SETEQ: Opc = ARMISD::VCEQ; break;
2765 case ISD::SETLT: Swap = true;
2766 case ISD::SETGT: Opc = ARMISD::VCGT; break;
2767 case ISD::SETLE: Swap = true;
2768 case ISD::SETGE: Opc = ARMISD::VCGE; break;
2769 case ISD::SETULT: Swap = true;
2770 case ISD::SETUGT: Opc = ARMISD::VCGTU; break;
2771 case ISD::SETULE: Swap = true;
2772 case ISD::SETUGE: Opc = ARMISD::VCGEU; break;
2775 // Detect VTST (Vector Test Bits) = icmp ne (and (op0, op1), zero).
2776 if (Opc == ARMISD::VCEQ) {
2779 if (ISD::isBuildVectorAllZeros(Op1.getNode()))
2781 else if (ISD::isBuildVectorAllZeros(Op0.getNode()))
2784 // Ignore bitconvert.
2785 if (AndOp.getNode() && AndOp.getOpcode() == ISD::BIT_CONVERT)
2786 AndOp = AndOp.getOperand(0);
2788 if (AndOp.getNode() && AndOp.getOpcode() == ISD::AND) {
2790 Op0 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(0));
2791 Op1 = DAG.getNode(ISD::BIT_CONVERT, dl, VT, AndOp.getOperand(1));
2798 std::swap(Op0, Op1);
2800 SDValue Result = DAG.getNode(Opc, dl, VT, Op0, Op1);
2803 Result = DAG.getNOT(dl, Result, VT);
2808 /// isNEONModifiedImm - Check if the specified splat value corresponds to a
2809 /// valid vector constant for a NEON instruction with a "modified immediate"
2810 /// operand (e.g., VMOV). If so, return either the constant being
2811 /// splatted or the encoded value, depending on the DoEncode parameter. The
2812 /// format of the encoded value is: bit12=Op, bits11-8=Cmode,
2813 /// bits7-0=Immediate.
2814 static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
2815 unsigned SplatBitSize, SelectionDAG &DAG,
2816 bool isVMOV, bool DoEncode) {
2817 unsigned Op, Cmode, Imm;
2820 // SplatBitSize is set to the smallest size that splats the vector, so a
2821 // zero vector will always have SplatBitSize == 8. However, NEON modified
2822 // immediate instructions others than VMOV do not support the 8-bit encoding
2823 // of a zero vector, and the default encoding of zero is supposed to be the
2829 switch (SplatBitSize) {
2831 // Any 1-byte value is OK. Op=0, Cmode=1110.
2832 assert((SplatBits & ~0xff) == 0 && "one byte splat value is too big");
2839 // NEON's 16-bit VMOV supports splat values where only one byte is nonzero.
2841 if ((SplatBits & ~0xff) == 0) {
2842 // Value = 0x00nn: Op=x, Cmode=100x.
2847 if ((SplatBits & ~0xff00) == 0) {
2848 // Value = 0xnn00: Op=x, Cmode=101x.
2850 Imm = SplatBits >> 8;
2856 // NEON's 32-bit VMOV supports splat values where:
2857 // * only one byte is nonzero, or
2858 // * the least significant byte is 0xff and the second byte is nonzero, or
2859 // * the least significant 2 bytes are 0xff and the third is nonzero.
2861 if ((SplatBits & ~0xff) == 0) {
2862 // Value = 0x000000nn: Op=x, Cmode=000x.
2867 if ((SplatBits & ~0xff00) == 0) {
2868 // Value = 0x0000nn00: Op=x, Cmode=001x.
2870 Imm = SplatBits >> 8;
2873 if ((SplatBits & ~0xff0000) == 0) {
2874 // Value = 0x00nn0000: Op=x, Cmode=010x.
2876 Imm = SplatBits >> 16;
2879 if ((SplatBits & ~0xff000000) == 0) {
2880 // Value = 0xnn000000: Op=x, Cmode=011x.
2882 Imm = SplatBits >> 24;
2886 if ((SplatBits & ~0xffff) == 0 &&
2887 ((SplatBits | SplatUndef) & 0xff) == 0xff) {
2888 // Value = 0x0000nnff: Op=x, Cmode=1100.
2890 Imm = SplatBits >> 8;
2895 if ((SplatBits & ~0xffffff) == 0 &&
2896 ((SplatBits | SplatUndef) & 0xffff) == 0xffff) {
2897 // Value = 0x00nnffff: Op=x, Cmode=1101.
2899 Imm = SplatBits >> 16;
2900 SplatBits |= 0xffff;
2904 // Note: there are a few 32-bit splat values (specifically: 00ffff00,
2905 // ff000000, ff0000ff, and ffff00ff) that are valid for VMOV.I64 but not
2906 // VMOV.I32. A (very) minor optimization would be to replicate the value
2907 // and fall through here to test for a valid 64-bit splat. But, then the
2908 // caller would also need to check and handle the change in size.
2912 // NEON has a 64-bit VMOV splat where each byte is either 0 or 0xff.
2915 uint64_t BitMask = 0xff;
2917 unsigned ImmMask = 1;
2919 for (int ByteNum = 0; ByteNum < 8; ++ByteNum) {
2920 if (((SplatBits | SplatUndef) & BitMask) == BitMask) {
2923 } else if ((SplatBits & BitMask) != 0) {
2929 // Op=1, Cmode=1110.
2938 llvm_unreachable("unexpected size for isNEONModifiedImm");
2943 return DAG.getTargetConstant((Op << 12) | (Cmode << 8) | Imm, MVT::i32);
2944 return DAG.getTargetConstant(SplatBits, VT);
2948 /// getNEONModImm - If this is a valid vector constant for a NEON instruction
2949 /// with a "modified immediate" operand (e.g., VMOV) of the specified element
2950 /// size, return the encoded value for that immediate. The ByteSize field
2951 /// indicates the number of bytes of each element [1248].
2952 SDValue ARM::getNEONModImm(SDNode *N, unsigned ByteSize, bool isVMOV,
2953 SelectionDAG &DAG) {
2954 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N);
2955 APInt SplatBits, SplatUndef;
2956 unsigned SplatBitSize;
2958 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
2959 HasAnyUndefs, ByteSize * 8))
2962 if (SplatBitSize > ByteSize * 8)
2965 return isNEONModifiedImm(SplatBits.getZExtValue(), SplatUndef.getZExtValue(),
2966 SplatBitSize, DAG, isVMOV, true);
2969 static bool isVEXTMask(const SmallVectorImpl<int> &M, EVT VT,
2970 bool &ReverseVEXT, unsigned &Imm) {
2971 unsigned NumElts = VT.getVectorNumElements();
2972 ReverseVEXT = false;
2975 // If this is a VEXT shuffle, the immediate value is the index of the first
2976 // element. The other shuffle indices must be the successive elements after
2978 unsigned ExpectedElt = Imm;
2979 for (unsigned i = 1; i < NumElts; ++i) {
2980 // Increment the expected index. If it wraps around, it may still be
2981 // a VEXT but the source vectors must be swapped.
2983 if (ExpectedElt == NumElts * 2) {
2988 if (ExpectedElt != static_cast<unsigned>(M[i]))
2992 // Adjust the index value if the source operands will be swapped.
2999 /// isVREVMask - Check if a vector shuffle corresponds to a VREV
3000 /// instruction with the specified blocksize. (The order of the elements
3001 /// within each block of the vector is reversed.)
3002 static bool isVREVMask(const SmallVectorImpl<int> &M, EVT VT,
3003 unsigned BlockSize) {
3004 assert((BlockSize==16 || BlockSize==32 || BlockSize==64) &&
3005 "Only possible block sizes for VREV are: 16, 32, 64");
3007 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3011 unsigned NumElts = VT.getVectorNumElements();
3012 unsigned BlockElts = M[0] + 1;
3014 if (BlockSize <= EltSz || BlockSize != BlockElts * EltSz)
3017 for (unsigned i = 0; i < NumElts; ++i) {
3018 if ((unsigned) M[i] !=
3019 (i - i%BlockElts) + (BlockElts - 1 - i%BlockElts))
3026 static bool isVTRNMask(const SmallVectorImpl<int> &M, EVT VT,
3027 unsigned &WhichResult) {
3028 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3032 unsigned NumElts = VT.getVectorNumElements();
3033 WhichResult = (M[0] == 0 ? 0 : 1);
3034 for (unsigned i = 0; i < NumElts; i += 2) {
3035 if ((unsigned) M[i] != i + WhichResult ||
3036 (unsigned) M[i+1] != i + NumElts + WhichResult)
3042 /// isVTRN_v_undef_Mask - Special case of isVTRNMask for canonical form of
3043 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
3044 /// Mask is e.g., <0, 0, 2, 2> instead of <0, 4, 2, 6>.
3045 static bool isVTRN_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
3046 unsigned &WhichResult) {
3047 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3051 unsigned NumElts = VT.getVectorNumElements();
3052 WhichResult = (M[0] == 0 ? 0 : 1);
3053 for (unsigned i = 0; i < NumElts; i += 2) {
3054 if ((unsigned) M[i] != i + WhichResult ||
3055 (unsigned) M[i+1] != i + WhichResult)
3061 static bool isVUZPMask(const SmallVectorImpl<int> &M, EVT VT,
3062 unsigned &WhichResult) {
3063 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3067 unsigned NumElts = VT.getVectorNumElements();
3068 WhichResult = (M[0] == 0 ? 0 : 1);
3069 for (unsigned i = 0; i != NumElts; ++i) {
3070 if ((unsigned) M[i] != 2 * i + WhichResult)
3074 // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3075 if (VT.is64BitVector() && EltSz == 32)
3081 /// isVUZP_v_undef_Mask - Special case of isVUZPMask for canonical form of
3082 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
3083 /// Mask is e.g., <0, 2, 0, 2> instead of <0, 2, 4, 6>,
3084 static bool isVUZP_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
3085 unsigned &WhichResult) {
3086 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3090 unsigned Half = VT.getVectorNumElements() / 2;
3091 WhichResult = (M[0] == 0 ? 0 : 1);
3092 for (unsigned j = 0; j != 2; ++j) {
3093 unsigned Idx = WhichResult;
3094 for (unsigned i = 0; i != Half; ++i) {
3095 if ((unsigned) M[i + j * Half] != Idx)
3101 // VUZP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3102 if (VT.is64BitVector() && EltSz == 32)
3108 static bool isVZIPMask(const SmallVectorImpl<int> &M, EVT VT,
3109 unsigned &WhichResult) {
3110 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3114 unsigned NumElts = VT.getVectorNumElements();
3115 WhichResult = (M[0] == 0 ? 0 : 1);
3116 unsigned Idx = WhichResult * NumElts / 2;
3117 for (unsigned i = 0; i != NumElts; i += 2) {
3118 if ((unsigned) M[i] != Idx ||
3119 (unsigned) M[i+1] != Idx + NumElts)
3124 // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3125 if (VT.is64BitVector() && EltSz == 32)
3131 /// isVZIP_v_undef_Mask - Special case of isVZIPMask for canonical form of
3132 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
3133 /// Mask is e.g., <0, 0, 1, 1> instead of <0, 4, 1, 5>.
3134 static bool isVZIP_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
3135 unsigned &WhichResult) {
3136 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
3140 unsigned NumElts = VT.getVectorNumElements();
3141 WhichResult = (M[0] == 0 ? 0 : 1);
3142 unsigned Idx = WhichResult * NumElts / 2;
3143 for (unsigned i = 0; i != NumElts; i += 2) {
3144 if ((unsigned) M[i] != Idx ||
3145 (unsigned) M[i+1] != Idx)
3150 // VZIP.32 for 64-bit vectors is a pseudo-instruction alias for VTRN.32.
3151 if (VT.is64BitVector() && EltSz == 32)
3158 static SDValue BuildSplat(SDValue Val, EVT VT, SelectionDAG &DAG, DebugLoc dl) {
3159 // Canonicalize all-zeros and all-ones vectors.
3160 ConstantSDNode *ConstVal = cast<ConstantSDNode>(Val.getNode());
3161 if (ConstVal->isNullValue())
3162 return getZeroVector(VT, DAG, dl);
3163 if (ConstVal->isAllOnesValue())
3164 return getOnesVector(VT, DAG, dl);
3167 if (VT.is64BitVector()) {
3168 switch (Val.getValueType().getSizeInBits()) {
3169 case 8: CanonicalVT = MVT::v8i8; break;
3170 case 16: CanonicalVT = MVT::v4i16; break;
3171 case 32: CanonicalVT = MVT::v2i32; break;
3172 case 64: CanonicalVT = MVT::v1i64; break;
3173 default: llvm_unreachable("unexpected splat element type"); break;
3176 assert(VT.is128BitVector() && "unknown splat vector size");
3177 switch (Val.getValueType().getSizeInBits()) {
3178 case 8: CanonicalVT = MVT::v16i8; break;
3179 case 16: CanonicalVT = MVT::v8i16; break;
3180 case 32: CanonicalVT = MVT::v4i32; break;
3181 case 64: CanonicalVT = MVT::v2i64; break;
3182 default: llvm_unreachable("unexpected splat element type"); break;
3186 // Build a canonical splat for this value.
3187 SmallVector<SDValue, 8> Ops;
3188 Ops.assign(CanonicalVT.getVectorNumElements(), Val);
3189 SDValue Res = DAG.getNode(ISD::BUILD_VECTOR, dl, CanonicalVT, &Ops[0],
3191 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Res);
3194 // If this is a case we can't handle, return null and let the default
3195 // expansion code take care of it.
3196 static SDValue LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) {
3197 BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode());
3198 DebugLoc dl = Op.getDebugLoc();
3199 EVT VT = Op.getValueType();
3201 APInt SplatBits, SplatUndef;
3202 unsigned SplatBitSize;
3204 if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
3205 if (SplatBitSize <= 64) {
3206 // Check if an immediate VMOV works.
3207 SDValue Val = isNEONModifiedImm(SplatBits.getZExtValue(),
3208 SplatUndef.getZExtValue(),
3209 SplatBitSize, DAG, true, false);
3211 return BuildSplat(Val, VT, DAG, dl);
3215 // Scan through the operands to see if only one value is used.
3216 unsigned NumElts = VT.getVectorNumElements();
3217 bool isOnlyLowElement = true;
3218 bool usesOnlyOneValue = true;
3219 bool isConstant = true;
3221 for (unsigned i = 0; i < NumElts; ++i) {
3222 SDValue V = Op.getOperand(i);
3223 if (V.getOpcode() == ISD::UNDEF)
3226 isOnlyLowElement = false;
3227 if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V))
3230 if (!Value.getNode())
3232 else if (V != Value)
3233 usesOnlyOneValue = false;
3236 if (!Value.getNode())
3237 return DAG.getUNDEF(VT);
3239 if (isOnlyLowElement)
3240 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value);
3242 // If all elements are constants, fall back to the default expansion, which
3243 // will generate a load from the constant pool.
3247 // Use VDUP for non-constant splats.
3248 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
3249 if (usesOnlyOneValue && EltSize <= 32)
3250 return DAG.getNode(ARMISD::VDUP, dl, VT, Value);
3252 // Vectors with 32- or 64-bit elements can be built by directly assigning
3253 // the subregisters. Lower it to an ARMISD::BUILD_VECTOR so the operands
3254 // will be legalized.
3255 if (EltSize >= 32) {
3256 // Do the expansion with floating-point types, since that is what the VFP
3257 // registers are defined to use, and since i64 is not legal.
3258 EVT EltVT = EVT::getFloatingPointVT(EltSize);
3259 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts);
3260 SmallVector<SDValue, 8> Ops;
3261 for (unsigned i = 0; i < NumElts; ++i)
3262 Ops.push_back(DAG.getNode(ISD::BIT_CONVERT, dl, EltVT, Op.getOperand(i)));
3263 SDValue Val = DAG.getNode(ARMISD::BUILD_VECTOR, dl, VecVT, &Ops[0],NumElts);
3264 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Val);
3270 /// isShuffleMaskLegal - Targets can use this to indicate that they only
3271 /// support *some* VECTOR_SHUFFLE operations, those with specific masks.
3272 /// By default, if a target supports the VECTOR_SHUFFLE node, all mask values
3273 /// are assumed to be legal.
3275 ARMTargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
3277 if (VT.getVectorNumElements() == 4 &&
3278 (VT.is128BitVector() || VT.is64BitVector())) {
3279 unsigned PFIndexes[4];
3280 for (unsigned i = 0; i != 4; ++i) {
3284 PFIndexes[i] = M[i];
3287 // Compute the index in the perfect shuffle table.
3288 unsigned PFTableIndex =
3289 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
3290 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
3291 unsigned Cost = (PFEntry >> 30);
3298 unsigned Imm, WhichResult;
3300 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
3301 return (EltSize >= 32 ||
3302 ShuffleVectorSDNode::isSplatMask(&M[0], VT) ||
3303 isVREVMask(M, VT, 64) ||
3304 isVREVMask(M, VT, 32) ||
3305 isVREVMask(M, VT, 16) ||
3306 isVEXTMask(M, VT, ReverseVEXT, Imm) ||
3307 isVTRNMask(M, VT, WhichResult) ||
3308 isVUZPMask(M, VT, WhichResult) ||
3309 isVZIPMask(M, VT, WhichResult) ||
3310 isVTRN_v_undef_Mask(M, VT, WhichResult) ||
3311 isVUZP_v_undef_Mask(M, VT, WhichResult) ||
3312 isVZIP_v_undef_Mask(M, VT, WhichResult));
3315 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
3316 /// the specified operations to build the shuffle.
3317 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
3318 SDValue RHS, SelectionDAG &DAG,
3320 unsigned OpNum = (PFEntry >> 26) & 0x0F;
3321 unsigned LHSID = (PFEntry >> 13) & ((1 << 13)-1);
3322 unsigned RHSID = (PFEntry >> 0) & ((1 << 13)-1);
3325 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
3334 OP_VUZPL, // VUZP, left result
3335 OP_VUZPR, // VUZP, right result
3336 OP_VZIPL, // VZIP, left result
3337 OP_VZIPR, // VZIP, right result
3338 OP_VTRNL, // VTRN, left result
3339 OP_VTRNR // VTRN, right result
3342 if (OpNum == OP_COPY) {
3343 if (LHSID == (1*9+2)*9+3) return LHS;
3344 assert(LHSID == ((4*9+5)*9+6)*9+7 && "Illegal OP_COPY!");
3348 SDValue OpLHS, OpRHS;
3349 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
3350 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
3351 EVT VT = OpLHS.getValueType();
3354 default: llvm_unreachable("Unknown shuffle opcode!");
3356 return DAG.getNode(ARMISD::VREV64, dl, VT, OpLHS);
3361 return DAG.getNode(ARMISD::VDUPLANE, dl, VT,
3362 OpLHS, DAG.getConstant(OpNum-OP_VDUP0, MVT::i32));
3366 return DAG.getNode(ARMISD::VEXT, dl, VT,
3368 DAG.getConstant(OpNum-OP_VEXT1+1, MVT::i32));
3371 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
3372 OpLHS, OpRHS).getValue(OpNum-OP_VUZPL);
3375 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
3376 OpLHS, OpRHS).getValue(OpNum-OP_VZIPL);
3379 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
3380 OpLHS, OpRHS).getValue(OpNum-OP_VTRNL);
3384 static SDValue LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) {
3385 SDValue V1 = Op.getOperand(0);
3386 SDValue V2 = Op.getOperand(1);
3387 DebugLoc dl = Op.getDebugLoc();
3388 EVT VT = Op.getValueType();
3389 ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op.getNode());
3390 SmallVector<int, 8> ShuffleMask;
3392 // Convert shuffles that are directly supported on NEON to target-specific
3393 // DAG nodes, instead of keeping them as shuffles and matching them again
3394 // during code selection. This is more efficient and avoids the possibility
3395 // of inconsistencies between legalization and selection.
3396 // FIXME: floating-point vectors should be canonicalized to integer vectors
3397 // of the same time so that they get CSEd properly.
3398 SVN->getMask(ShuffleMask);
3400 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
3401 if (EltSize <= 32) {
3402 if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0], VT)) {
3403 int Lane = SVN->getSplatIndex();
3404 // If this is undef splat, generate it via "just" vdup, if possible.
3405 if (Lane == -1) Lane = 0;
3407 if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR) {
3408 return DAG.getNode(ARMISD::VDUP, dl, VT, V1.getOperand(0));
3410 return DAG.getNode(ARMISD::VDUPLANE, dl, VT, V1,
3411 DAG.getConstant(Lane, MVT::i32));
3416 if (isVEXTMask(ShuffleMask, VT, ReverseVEXT, Imm)) {
3419 return DAG.getNode(ARMISD::VEXT, dl, VT, V1, V2,
3420 DAG.getConstant(Imm, MVT::i32));
3423 if (isVREVMask(ShuffleMask, VT, 64))
3424 return DAG.getNode(ARMISD::VREV64, dl, VT, V1);
3425 if (isVREVMask(ShuffleMask, VT, 32))
3426 return DAG.getNode(ARMISD::VREV32, dl, VT, V1);
3427 if (isVREVMask(ShuffleMask, VT, 16))
3428 return DAG.getNode(ARMISD::VREV16, dl, VT, V1);
3430 // Check for Neon shuffles that modify both input vectors in place.
3431 // If both results are used, i.e., if there are two shuffles with the same
3432 // source operands and with masks corresponding to both results of one of
3433 // these operations, DAG memoization will ensure that a single node is
3434 // used for both shuffles.
3435 unsigned WhichResult;
3436 if (isVTRNMask(ShuffleMask, VT, WhichResult))
3437 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
3438 V1, V2).getValue(WhichResult);
3439 if (isVUZPMask(ShuffleMask, VT, WhichResult))
3440 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
3441 V1, V2).getValue(WhichResult);
3442 if (isVZIPMask(ShuffleMask, VT, WhichResult))
3443 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
3444 V1, V2).getValue(WhichResult);
3446 if (isVTRN_v_undef_Mask(ShuffleMask, VT, WhichResult))
3447 return DAG.getNode(ARMISD::VTRN, dl, DAG.getVTList(VT, VT),
3448 V1, V1).getValue(WhichResult);
3449 if (isVUZP_v_undef_Mask(ShuffleMask, VT, WhichResult))
3450 return DAG.getNode(ARMISD::VUZP, dl, DAG.getVTList(VT, VT),
3451 V1, V1).getValue(WhichResult);
3452 if (isVZIP_v_undef_Mask(ShuffleMask, VT, WhichResult))
3453 return DAG.getNode(ARMISD::VZIP, dl, DAG.getVTList(VT, VT),
3454 V1, V1).getValue(WhichResult);
3457 // If the shuffle is not directly supported and it has 4 elements, use
3458 // the PerfectShuffle-generated table to synthesize it from other shuffles.
3459 unsigned NumElts = VT.getVectorNumElements();
3461 unsigned PFIndexes[4];
3462 for (unsigned i = 0; i != 4; ++i) {
3463 if (ShuffleMask[i] < 0)
3466 PFIndexes[i] = ShuffleMask[i];
3469 // Compute the index in the perfect shuffle table.
3470 unsigned PFTableIndex =
3471 PFIndexes[0]*9*9*9+PFIndexes[1]*9*9+PFIndexes[2]*9+PFIndexes[3];
3472 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
3473 unsigned Cost = (PFEntry >> 30);
3476 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
3479 // Implement shuffles with 32- or 64-bit elements as ARMISD::BUILD_VECTORs.
3480 if (EltSize >= 32) {
3481 // Do the expansion with floating-point types, since that is what the VFP
3482 // registers are defined to use, and since i64 is not legal.
3483 EVT EltVT = EVT::getFloatingPointVT(EltSize);
3484 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), EltVT, NumElts);
3485 V1 = DAG.getNode(ISD::BIT_CONVERT, dl, VecVT, V1);
3486 V2 = DAG.getNode(ISD::BIT_CONVERT, dl, VecVT, V2);
3487 SmallVector<SDValue, 8> Ops;
3488 for (unsigned i = 0; i < NumElts; ++i) {
3489 if (ShuffleMask[i] < 0)
3490 Ops.push_back(DAG.getUNDEF(EltVT));
3492 Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
3493 ShuffleMask[i] < (int)NumElts ? V1 : V2,
3494 DAG.getConstant(ShuffleMask[i] & (NumElts-1),
3497 SDValue Val = DAG.getNode(ARMISD::BUILD_VECTOR, dl, VecVT, &Ops[0],NumElts);
3498 return DAG.getNode(ISD::BIT_CONVERT, dl, VT, Val);
3504 static SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) {
3505 EVT VT = Op.getValueType();
3506 DebugLoc dl = Op.getDebugLoc();
3507 SDValue Vec = Op.getOperand(0);
3508 SDValue Lane = Op.getOperand(1);
3509 assert(VT == MVT::i32 &&
3510 Vec.getValueType().getVectorElementType().getSizeInBits() < 32 &&
3511 "unexpected type for custom-lowering vector extract");
3512 return DAG.getNode(ARMISD::VGETLANEu, dl, MVT::i32, Vec, Lane);
3515 static SDValue LowerCONCAT_VECTORS(SDValue Op, SelectionDAG &DAG) {
3516 // The only time a CONCAT_VECTORS operation can have legal types is when
3517 // two 64-bit vectors are concatenated to a 128-bit vector.
3518 assert(Op.getValueType().is128BitVector() && Op.getNumOperands() == 2 &&
3519 "unexpected CONCAT_VECTORS");
3520 DebugLoc dl = Op.getDebugLoc();
3521 SDValue Val = DAG.getUNDEF(MVT::v2f64);
3522 SDValue Op0 = Op.getOperand(0);
3523 SDValue Op1 = Op.getOperand(1);
3524 if (Op0.getOpcode() != ISD::UNDEF)
3525 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
3526 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op0),
3527 DAG.getIntPtrConstant(0));
3528 if (Op1.getOpcode() != ISD::UNDEF)
3529 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, MVT::v2f64, Val,
3530 DAG.getNode(ISD::BIT_CONVERT, dl, MVT::f64, Op1),
3531 DAG.getIntPtrConstant(1));
3532 return DAG.getNode(ISD::BIT_CONVERT, dl, Op.getValueType(), Val);
3535 SDValue ARMTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const {
3536 switch (Op.getOpcode()) {
3537 default: llvm_unreachable("Don't know how to custom lower this!");
3538 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
3539 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
3540 case ISD::GlobalAddress:
3541 return Subtarget->isTargetDarwin() ? LowerGlobalAddressDarwin(Op, DAG) :
3542 LowerGlobalAddressELF(Op, DAG);
3543 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
3544 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
3545 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
3546 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
3547 case ISD::DYNAMIC_STACKALLOC: return LowerDYNAMIC_STACKALLOC(Op, DAG);
3548 case ISD::VASTART: return LowerVASTART(Op, DAG);
3549 case ISD::MEMBARRIER: return LowerMEMBARRIER(Op, DAG, Subtarget);
3550 case ISD::SINT_TO_FP:
3551 case ISD::UINT_TO_FP: return LowerINT_TO_FP(Op, DAG);
3552 case ISD::FP_TO_SINT:
3553 case ISD::FP_TO_UINT: return LowerFP_TO_INT(Op, DAG);
3554 case ISD::FCOPYSIGN: return LowerFCOPYSIGN(Op, DAG);
3555 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
3556 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
3557 case ISD::GLOBAL_OFFSET_TABLE: return LowerGLOBAL_OFFSET_TABLE(Op, DAG);
3558 case ISD::EH_SJLJ_SETJMP: return LowerEH_SJLJ_SETJMP(Op, DAG);
3559 case ISD::EH_SJLJ_LONGJMP: return LowerEH_SJLJ_LONGJMP(Op, DAG);
3560 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG,
3562 case ISD::BIT_CONVERT: return ExpandBIT_CONVERT(Op.getNode(), DAG);
3565 case ISD::SRA: return LowerShift(Op.getNode(), DAG, Subtarget);
3566 case ISD::SHL_PARTS: return LowerShiftLeftParts(Op, DAG);
3567 case ISD::SRL_PARTS:
3568 case ISD::SRA_PARTS: return LowerShiftRightParts(Op, DAG);
3569 case ISD::CTTZ: return LowerCTTZ(Op.getNode(), DAG, Subtarget);
3570 case ISD::VSETCC: return LowerVSETCC(Op, DAG);
3571 case ISD::BUILD_VECTOR: return LowerBUILD_VECTOR(Op, DAG);
3572 case ISD::VECTOR_SHUFFLE: return LowerVECTOR_SHUFFLE(Op, DAG);
3573 case ISD::EXTRACT_VECTOR_ELT: return LowerEXTRACT_VECTOR_ELT(Op, DAG);
3574 case ISD::CONCAT_VECTORS: return LowerCONCAT_VECTORS(Op, DAG);
3579 /// ReplaceNodeResults - Replace the results of node with an illegal result
3580 /// type with new values built out of custom code.
3581 void ARMTargetLowering::ReplaceNodeResults(SDNode *N,
3582 SmallVectorImpl<SDValue>&Results,
3583 SelectionDAG &DAG) const {
3585 switch (N->getOpcode()) {
3587 llvm_unreachable("Don't know how to custom expand this!");
3589 case ISD::BIT_CONVERT:
3590 Res = ExpandBIT_CONVERT(N, DAG);
3594 Res = LowerShift(N, DAG, Subtarget);
3598 Results.push_back(Res);
3601 //===----------------------------------------------------------------------===//
3602 // ARM Scheduler Hooks
3603 //===----------------------------------------------------------------------===//
3606 ARMTargetLowering::EmitAtomicCmpSwap(MachineInstr *MI,
3607 MachineBasicBlock *BB,
3608 unsigned Size) const {
3609 unsigned dest = MI->getOperand(0).getReg();
3610 unsigned ptr = MI->getOperand(1).getReg();
3611 unsigned oldval = MI->getOperand(2).getReg();
3612 unsigned newval = MI->getOperand(3).getReg();
3613 unsigned scratch = BB->getParent()->getRegInfo()
3614 .createVirtualRegister(ARM::GPRRegisterClass);
3615 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3616 DebugLoc dl = MI->getDebugLoc();
3617 bool isThumb2 = Subtarget->isThumb2();
3619 unsigned ldrOpc, strOpc;
3621 default: llvm_unreachable("unsupported size for AtomicCmpSwap!");
3623 ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB;
3624 strOpc = isThumb2 ? ARM::t2LDREXB : ARM::STREXB;
3627 ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH;
3628 strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH;
3631 ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX;
3632 strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX;
3636 MachineFunction *MF = BB->getParent();
3637 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3638 MachineFunction::iterator It = BB;
3639 ++It; // insert the new blocks after the current block
3641 MachineBasicBlock *loop1MBB = MF->CreateMachineBasicBlock(LLVM_BB);
3642 MachineBasicBlock *loop2MBB = MF->CreateMachineBasicBlock(LLVM_BB);
3643 MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
3644 MF->insert(It, loop1MBB);
3645 MF->insert(It, loop2MBB);
3646 MF->insert(It, exitMBB);
3648 // Transfer the remainder of BB and its successor edges to exitMBB.
3649 exitMBB->splice(exitMBB->begin(), BB,
3650 llvm::next(MachineBasicBlock::iterator(MI)),
3652 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
3656 // fallthrough --> loop1MBB
3657 BB->addSuccessor(loop1MBB);
3660 // ldrex dest, [ptr]
3664 AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr));
3665 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPrr : ARM::CMPrr))
3666 .addReg(dest).addReg(oldval));
3667 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
3668 .addMBB(exitMBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
3669 BB->addSuccessor(loop2MBB);
3670 BB->addSuccessor(exitMBB);
3673 // strex scratch, newval, [ptr]
3677 AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(newval)
3679 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
3680 .addReg(scratch).addImm(0));
3681 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
3682 .addMBB(loop1MBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
3683 BB->addSuccessor(loop1MBB);
3684 BB->addSuccessor(exitMBB);
3690 MI->eraseFromParent(); // The instruction is gone now.
3696 ARMTargetLowering::EmitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
3697 unsigned Size, unsigned BinOpcode) const {
3698 // This also handles ATOMIC_SWAP, indicated by BinOpcode==0.
3699 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3701 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3702 MachineFunction *MF = BB->getParent();
3703 MachineFunction::iterator It = BB;
3706 unsigned dest = MI->getOperand(0).getReg();
3707 unsigned ptr = MI->getOperand(1).getReg();
3708 unsigned incr = MI->getOperand(2).getReg();
3709 DebugLoc dl = MI->getDebugLoc();
3711 bool isThumb2 = Subtarget->isThumb2();
3712 unsigned ldrOpc, strOpc;
3714 default: llvm_unreachable("unsupported size for AtomicCmpSwap!");
3716 ldrOpc = isThumb2 ? ARM::t2LDREXB : ARM::LDREXB;
3717 strOpc = isThumb2 ? ARM::t2STREXB : ARM::STREXB;
3720 ldrOpc = isThumb2 ? ARM::t2LDREXH : ARM::LDREXH;
3721 strOpc = isThumb2 ? ARM::t2STREXH : ARM::STREXH;
3724 ldrOpc = isThumb2 ? ARM::t2LDREX : ARM::LDREX;
3725 strOpc = isThumb2 ? ARM::t2STREX : ARM::STREX;
3729 MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB);
3730 MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
3731 MF->insert(It, loopMBB);
3732 MF->insert(It, exitMBB);
3734 // Transfer the remainder of BB and its successor edges to exitMBB.
3735 exitMBB->splice(exitMBB->begin(), BB,
3736 llvm::next(MachineBasicBlock::iterator(MI)),
3738 exitMBB->transferSuccessorsAndUpdatePHIs(BB);
3740 MachineRegisterInfo &RegInfo = MF->getRegInfo();
3741 unsigned scratch = RegInfo.createVirtualRegister(ARM::GPRRegisterClass);
3742 unsigned scratch2 = (!BinOpcode) ? incr :
3743 RegInfo.createVirtualRegister(ARM::GPRRegisterClass);
3747 // fallthrough --> loopMBB
3748 BB->addSuccessor(loopMBB);
3752 // <binop> scratch2, dest, incr
3753 // strex scratch, scratch2, ptr
3756 // fallthrough --> exitMBB
3758 AddDefaultPred(BuildMI(BB, dl, TII->get(ldrOpc), dest).addReg(ptr));
3760 // operand order needs to go the other way for NAND
3761 if (BinOpcode == ARM::BICrr || BinOpcode == ARM::t2BICrr)
3762 AddDefaultPred(BuildMI(BB, dl, TII->get(BinOpcode), scratch2).
3763 addReg(incr).addReg(dest)).addReg(0);
3765 AddDefaultPred(BuildMI(BB, dl, TII->get(BinOpcode), scratch2).
3766 addReg(dest).addReg(incr)).addReg(0);
3769 AddDefaultPred(BuildMI(BB, dl, TII->get(strOpc), scratch).addReg(scratch2)
3771 AddDefaultPred(BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2CMPri : ARM::CMPri))
3772 .addReg(scratch).addImm(0));
3773 BuildMI(BB, dl, TII->get(isThumb2 ? ARM::t2Bcc : ARM::Bcc))
3774 .addMBB(loopMBB).addImm(ARMCC::NE).addReg(ARM::CPSR);
3776 BB->addSuccessor(loopMBB);
3777 BB->addSuccessor(exitMBB);
3783 MI->eraseFromParent(); // The instruction is gone now.
3789 ARMTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
3790 MachineBasicBlock *BB) const {
3791 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
3792 DebugLoc dl = MI->getDebugLoc();
3793 bool isThumb2 = Subtarget->isThumb2();
3794 switch (MI->getOpcode()) {
3797 llvm_unreachable("Unexpected instr type to insert");
3799 case ARM::ATOMIC_LOAD_ADD_I8:
3800 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
3801 case ARM::ATOMIC_LOAD_ADD_I16:
3802 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
3803 case ARM::ATOMIC_LOAD_ADD_I32:
3804 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ADDrr : ARM::ADDrr);
3806 case ARM::ATOMIC_LOAD_AND_I8:
3807 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
3808 case ARM::ATOMIC_LOAD_AND_I16:
3809 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
3810 case ARM::ATOMIC_LOAD_AND_I32:
3811 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ANDrr : ARM::ANDrr);
3813 case ARM::ATOMIC_LOAD_OR_I8:
3814 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
3815 case ARM::ATOMIC_LOAD_OR_I16:
3816 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
3817 case ARM::ATOMIC_LOAD_OR_I32:
3818 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2ORRrr : ARM::ORRrr);
3820 case ARM::ATOMIC_LOAD_XOR_I8:
3821 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
3822 case ARM::ATOMIC_LOAD_XOR_I16:
3823 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
3824 case ARM::ATOMIC_LOAD_XOR_I32:
3825 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2EORrr : ARM::EORrr);
3827 case ARM::ATOMIC_LOAD_NAND_I8:
3828 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
3829 case ARM::ATOMIC_LOAD_NAND_I16:
3830 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
3831 case ARM::ATOMIC_LOAD_NAND_I32:
3832 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2BICrr : ARM::BICrr);
3834 case ARM::ATOMIC_LOAD_SUB_I8:
3835 return EmitAtomicBinary(MI, BB, 1, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
3836 case ARM::ATOMIC_LOAD_SUB_I16:
3837 return EmitAtomicBinary(MI, BB, 2, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
3838 case ARM::ATOMIC_LOAD_SUB_I32:
3839 return EmitAtomicBinary(MI, BB, 4, isThumb2 ? ARM::t2SUBrr : ARM::SUBrr);
3841 case ARM::ATOMIC_SWAP_I8: return EmitAtomicBinary(MI, BB, 1, 0);
3842 case ARM::ATOMIC_SWAP_I16: return EmitAtomicBinary(MI, BB, 2, 0);
3843 case ARM::ATOMIC_SWAP_I32: return EmitAtomicBinary(MI, BB, 4, 0);
3845 case ARM::ATOMIC_CMP_SWAP_I8: return EmitAtomicCmpSwap(MI, BB, 1);
3846 case ARM::ATOMIC_CMP_SWAP_I16: return EmitAtomicCmpSwap(MI, BB, 2);
3847 case ARM::ATOMIC_CMP_SWAP_I32: return EmitAtomicCmpSwap(MI, BB, 4);
3849 case ARM::tMOVCCr_pseudo: {
3850 // To "insert" a SELECT_CC instruction, we actually have to insert the
3851 // diamond control-flow pattern. The incoming instruction knows the
3852 // destination vreg to set, the condition code register to branch on, the
3853 // true/false values to select between, and a branch opcode to use.
3854 const BasicBlock *LLVM_BB = BB->getBasicBlock();
3855 MachineFunction::iterator It = BB;
3861 // cmpTY ccX, r1, r2
3863 // fallthrough --> copy0MBB
3864 MachineBasicBlock *thisMBB = BB;
3865 MachineFunction *F = BB->getParent();
3866 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
3867 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
3868 F->insert(It, copy0MBB);
3869 F->insert(It, sinkMBB);
3871 // Transfer the remainder of BB and its successor edges to sinkMBB.
3872 sinkMBB->splice(sinkMBB->begin(), BB,
3873 llvm::next(MachineBasicBlock::iterator(MI)),
3875 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
3877 BB->addSuccessor(copy0MBB);
3878 BB->addSuccessor(sinkMBB);
3880 BuildMI(BB, dl, TII->get(ARM::tBcc)).addMBB(sinkMBB)
3881 .addImm(MI->getOperand(3).getImm()).addReg(MI->getOperand(4).getReg());
3884 // %FalseValue = ...
3885 // # fallthrough to sinkMBB
3888 // Update machine-CFG edges
3889 BB->addSuccessor(sinkMBB);
3892 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
3895 BuildMI(*BB, BB->begin(), dl,
3896 TII->get(ARM::PHI), MI->getOperand(0).getReg())
3897 .addReg(MI->getOperand(1).getReg()).addMBB(copy0MBB)
3898 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
3900 MI->eraseFromParent(); // The pseudo instruction is gone now.
3907 case ARM::t2SUBrSPi_:
3908 case ARM::t2SUBrSPi12_:
3909 case ARM::t2SUBrSPs_: {
3910 MachineFunction *MF = BB->getParent();
3911 unsigned DstReg = MI->getOperand(0).getReg();
3912 unsigned SrcReg = MI->getOperand(1).getReg();
3913 bool DstIsDead = MI->getOperand(0).isDead();
3914 bool SrcIsKill = MI->getOperand(1).isKill();
3916 if (SrcReg != ARM::SP) {
3917 // Copy the source to SP from virtual register.
3918 const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(SrcReg);
3919 unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
3920 ? ARM::tMOVtgpr2gpr : ARM::tMOVgpr2gpr;
3921 BuildMI(*BB, MI, dl, TII->get(CopyOpc), ARM::SP)
3922 .addReg(SrcReg, getKillRegState(SrcIsKill));
3926 bool NeedPred = false, NeedCC = false, NeedOp3 = false;
3927 switch (MI->getOpcode()) {
3929 llvm_unreachable("Unexpected pseudo instruction!");
3935 OpOpc = ARM::tADDspr;
3938 OpOpc = ARM::tSUBspi;
3940 case ARM::t2SUBrSPi_:
3941 OpOpc = ARM::t2SUBrSPi;
3942 NeedPred = true; NeedCC = true;
3944 case ARM::t2SUBrSPi12_:
3945 OpOpc = ARM::t2SUBrSPi12;
3948 case ARM::t2SUBrSPs_:
3949 OpOpc = ARM::t2SUBrSPs;
3950 NeedPred = true; NeedCC = true; NeedOp3 = true;
3953 MachineInstrBuilder MIB = BuildMI(*BB, MI, dl, TII->get(OpOpc), ARM::SP);
3954 if (OpOpc == ARM::tAND)
3955 AddDefaultT1CC(MIB);
3956 MIB.addReg(ARM::SP);
3957 MIB.addOperand(MI->getOperand(2));
3959 MIB.addOperand(MI->getOperand(3));
3961 AddDefaultPred(MIB);
3965 // Copy the result from SP to virtual register.
3966 const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(DstReg);
3967 unsigned CopyOpc = (RC == ARM::tGPRRegisterClass)
3968 ? ARM::tMOVgpr2tgpr : ARM::tMOVgpr2gpr;
3969 BuildMI(*BB, MI, dl, TII->get(CopyOpc))
3970 .addReg(DstReg, getDefRegState(true) | getDeadRegState(DstIsDead))
3972 MI->eraseFromParent(); // The pseudo instruction is gone now.
3978 //===----------------------------------------------------------------------===//
3979 // ARM Optimization Hooks
3980 //===----------------------------------------------------------------------===//
3983 SDValue combineSelectAndUse(SDNode *N, SDValue Slct, SDValue OtherOp,
3984 TargetLowering::DAGCombinerInfo &DCI) {
3985 SelectionDAG &DAG = DCI.DAG;
3986 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3987 EVT VT = N->getValueType(0);
3988 unsigned Opc = N->getOpcode();
3989 bool isSlctCC = Slct.getOpcode() == ISD::SELECT_CC;
3990 SDValue LHS = isSlctCC ? Slct.getOperand(2) : Slct.getOperand(1);
3991 SDValue RHS = isSlctCC ? Slct.getOperand(3) : Slct.getOperand(2);
3992 ISD::CondCode CC = ISD::SETCC_INVALID;
3995 CC = cast<CondCodeSDNode>(Slct.getOperand(4))->get();
3997 SDValue CCOp = Slct.getOperand(0);
3998 if (CCOp.getOpcode() == ISD::SETCC)
3999 CC = cast<CondCodeSDNode>(CCOp.getOperand(2))->get();
4002 bool DoXform = false;
4004 assert ((Opc == ISD::ADD || (Opc == ISD::SUB && Slct == N->getOperand(1))) &&
4007 if (LHS.getOpcode() == ISD::Constant &&
4008 cast<ConstantSDNode>(LHS)->isNullValue()) {
4010 } else if (CC != ISD::SETCC_INVALID &&
4011 RHS.getOpcode() == ISD::Constant &&
4012 cast<ConstantSDNode>(RHS)->isNullValue()) {
4013 std::swap(LHS, RHS);
4014 SDValue Op0 = Slct.getOperand(0);
4015 EVT OpVT = isSlctCC ? Op0.getValueType() :
4016 Op0.getOperand(0).getValueType();
4017 bool isInt = OpVT.isInteger();
4018 CC = ISD::getSetCCInverse(CC, isInt);
4020 if (!TLI.isCondCodeLegal(CC, OpVT))
4021 return SDValue(); // Inverse operator isn't legal.
4028 SDValue Result = DAG.getNode(Opc, RHS.getDebugLoc(), VT, OtherOp, RHS);
4030 return DAG.getSelectCC(N->getDebugLoc(), OtherOp, Result,
4031 Slct.getOperand(0), Slct.getOperand(1), CC);
4032 SDValue CCOp = Slct.getOperand(0);
4034 CCOp = DAG.getSetCC(Slct.getDebugLoc(), CCOp.getValueType(),
4035 CCOp.getOperand(0), CCOp.getOperand(1), CC);
4036 return DAG.getNode(ISD::SELECT, N->getDebugLoc(), VT,
4037 CCOp, OtherOp, Result);
4042 /// PerformADDCombine - Target-specific dag combine xforms for ISD::ADD.
4043 static SDValue PerformADDCombine(SDNode *N,
4044 TargetLowering::DAGCombinerInfo &DCI) {
4045 // added by evan in r37685 with no testcase.
4046 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
4048 // fold (add (select cc, 0, c), x) -> (select cc, x, (add, x, c))
4049 if (N0.getOpcode() == ISD::SELECT && N0.getNode()->hasOneUse()) {
4050 SDValue Result = combineSelectAndUse(N, N0, N1, DCI);
4051 if (Result.getNode()) return Result;
4053 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
4054 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
4055 if (Result.getNode()) return Result;
4061 /// PerformSUBCombine - Target-specific dag combine xforms for ISD::SUB.
4062 static SDValue PerformSUBCombine(SDNode *N,
4063 TargetLowering::DAGCombinerInfo &DCI) {
4064 // added by evan in r37685 with no testcase.
4065 SDValue N0 = N->getOperand(0), N1 = N->getOperand(1);
4067 // fold (sub x, (select cc, 0, c)) -> (select cc, x, (sub, x, c))
4068 if (N1.getOpcode() == ISD::SELECT && N1.getNode()->hasOneUse()) {
4069 SDValue Result = combineSelectAndUse(N, N1, N0, DCI);
4070 if (Result.getNode()) return Result;
4076 static SDValue PerformMULCombine(SDNode *N,
4077 TargetLowering::DAGCombinerInfo &DCI,
4078 const ARMSubtarget *Subtarget) {
4079 SelectionDAG &DAG = DCI.DAG;
4081 if (Subtarget->isThumb1Only())
4084 if (DAG.getMachineFunction().
4085 getFunction()->hasFnAttr(Attribute::OptimizeForSize))
4088 if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer())
4091 EVT VT = N->getValueType(0);
4095 ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1));
4099 uint64_t MulAmt = C->getZExtValue();
4100 unsigned ShiftAmt = CountTrailingZeros_64(MulAmt);
4101 ShiftAmt = ShiftAmt & (32 - 1);
4102 SDValue V = N->getOperand(0);
4103 DebugLoc DL = N->getDebugLoc();
4106 MulAmt >>= ShiftAmt;
4107 if (isPowerOf2_32(MulAmt - 1)) {
4108 // (mul x, 2^N + 1) => (add (shl x, N), x)
4109 Res = DAG.getNode(ISD::ADD, DL, VT,
4110 V, DAG.getNode(ISD::SHL, DL, VT,
4111 V, DAG.getConstant(Log2_32(MulAmt-1),
4113 } else if (isPowerOf2_32(MulAmt + 1)) {
4114 // (mul x, 2^N - 1) => (sub (shl x, N), x)
4115 Res = DAG.getNode(ISD::SUB, DL, VT,
4116 DAG.getNode(ISD::SHL, DL, VT,
4117 V, DAG.getConstant(Log2_32(MulAmt+1),
4124 Res = DAG.getNode(ISD::SHL, DL, VT, Res,
4125 DAG.getConstant(ShiftAmt, MVT::i32));
4127 // Do not add new nodes to DAG combiner worklist.
4128 DCI.CombineTo(N, Res, false);
4132 /// PerformVMOVRRDCombine - Target-specific dag combine xforms for
4133 /// ARMISD::VMOVRRD.
4134 static SDValue PerformVMOVRRDCombine(SDNode *N,
4135 TargetLowering::DAGCombinerInfo &DCI) {
4136 // fmrrd(fmdrr x, y) -> x,y
4137 SDValue InDouble = N->getOperand(0);
4138 if (InDouble.getOpcode() == ARMISD::VMOVDRR)
4139 return DCI.CombineTo(N, InDouble.getOperand(0), InDouble.getOperand(1));
4143 /// getVShiftImm - Check if this is a valid build_vector for the immediate
4144 /// operand of a vector shift operation, where all the elements of the
4145 /// build_vector must have the same constant integer value.
4146 static bool getVShiftImm(SDValue Op, unsigned ElementBits, int64_t &Cnt) {
4147 // Ignore bit_converts.
4148 while (Op.getOpcode() == ISD::BIT_CONVERT)
4149 Op = Op.getOperand(0);
4150 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
4151 APInt SplatBits, SplatUndef;
4152 unsigned SplatBitSize;
4154 if (! BVN || ! BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
4155 HasAnyUndefs, ElementBits) ||
4156 SplatBitSize > ElementBits)
4158 Cnt = SplatBits.getSExtValue();
4162 /// isVShiftLImm - Check if this is a valid build_vector for the immediate
4163 /// operand of a vector shift left operation. That value must be in the range:
4164 /// 0 <= Value < ElementBits for a left shift; or
4165 /// 0 <= Value <= ElementBits for a long left shift.
4166 static bool isVShiftLImm(SDValue Op, EVT VT, bool isLong, int64_t &Cnt) {
4167 assert(VT.isVector() && "vector shift count is not a vector type");
4168 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
4169 if (! getVShiftImm(Op, ElementBits, Cnt))
4171 return (Cnt >= 0 && (isLong ? Cnt-1 : Cnt) < ElementBits);
4174 /// isVShiftRImm - Check if this is a valid build_vector for the immediate
4175 /// operand of a vector shift right operation. For a shift opcode, the value
4176 /// is positive, but for an intrinsic the value count must be negative. The
4177 /// absolute value must be in the range:
4178 /// 1 <= |Value| <= ElementBits for a right shift; or
4179 /// 1 <= |Value| <= ElementBits/2 for a narrow right shift.
4180 static bool isVShiftRImm(SDValue Op, EVT VT, bool isNarrow, bool isIntrinsic,
4182 assert(VT.isVector() && "vector shift count is not a vector type");
4183 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
4184 if (! getVShiftImm(Op, ElementBits, Cnt))
4188 return (Cnt >= 1 && Cnt <= (isNarrow ? ElementBits/2 : ElementBits));
4191 /// PerformIntrinsicCombine - ARM-specific DAG combining for intrinsics.
4192 static SDValue PerformIntrinsicCombine(SDNode *N, SelectionDAG &DAG) {
4193 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
4196 // Don't do anything for most intrinsics.
4199 // Vector shifts: check for immediate versions and lower them.
4200 // Note: This is done during DAG combining instead of DAG legalizing because
4201 // the build_vectors for 64-bit vector element shift counts are generally
4202 // not legal, and it is hard to see their values after they get legalized to
4203 // loads from a constant pool.
4204 case Intrinsic::arm_neon_vshifts:
4205 case Intrinsic::arm_neon_vshiftu:
4206 case Intrinsic::arm_neon_vshiftls:
4207 case Intrinsic::arm_neon_vshiftlu:
4208 case Intrinsic::arm_neon_vshiftn:
4209 case Intrinsic::arm_neon_vrshifts:
4210 case Intrinsic::arm_neon_vrshiftu:
4211 case Intrinsic::arm_neon_vrshiftn:
4212 case Intrinsic::arm_neon_vqshifts:
4213 case Intrinsic::arm_neon_vqshiftu:
4214 case Intrinsic::arm_neon_vqshiftsu:
4215 case Intrinsic::arm_neon_vqshiftns:
4216 case Intrinsic::arm_neon_vqshiftnu:
4217 case Intrinsic::arm_neon_vqshiftnsu:
4218 case Intrinsic::arm_neon_vqrshiftns:
4219 case Intrinsic::arm_neon_vqrshiftnu:
4220 case Intrinsic::arm_neon_vqrshiftnsu: {
4221 EVT VT = N->getOperand(1).getValueType();
4223 unsigned VShiftOpc = 0;
4226 case Intrinsic::arm_neon_vshifts:
4227 case Intrinsic::arm_neon_vshiftu:
4228 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt)) {
4229 VShiftOpc = ARMISD::VSHL;
4232 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt)) {
4233 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshifts ?
4234 ARMISD::VSHRs : ARMISD::VSHRu);
4239 case Intrinsic::arm_neon_vshiftls:
4240 case Intrinsic::arm_neon_vshiftlu:
4241 if (isVShiftLImm(N->getOperand(2), VT, true, Cnt))
4243 llvm_unreachable("invalid shift count for vshll intrinsic");
4245 case Intrinsic::arm_neon_vrshifts:
4246 case Intrinsic::arm_neon_vrshiftu:
4247 if (isVShiftRImm(N->getOperand(2), VT, false, true, Cnt))
4251 case Intrinsic::arm_neon_vqshifts:
4252 case Intrinsic::arm_neon_vqshiftu:
4253 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
4257 case Intrinsic::arm_neon_vqshiftsu:
4258 if (isVShiftLImm(N->getOperand(2), VT, false, Cnt))
4260 llvm_unreachable("invalid shift count for vqshlu intrinsic");
4262 case Intrinsic::arm_neon_vshiftn:
4263 case Intrinsic::arm_neon_vrshiftn:
4264 case Intrinsic::arm_neon_vqshiftns:
4265 case Intrinsic::arm_neon_vqshiftnu:
4266 case Intrinsic::arm_neon_vqshiftnsu:
4267 case Intrinsic::arm_neon_vqrshiftns:
4268 case Intrinsic::arm_neon_vqrshiftnu:
4269 case Intrinsic::arm_neon_vqrshiftnsu:
4270 // Narrowing shifts require an immediate right shift.
4271 if (isVShiftRImm(N->getOperand(2), VT, true, true, Cnt))
4273 llvm_unreachable("invalid shift count for narrowing vector shift "
4277 llvm_unreachable("unhandled vector shift");
4281 case Intrinsic::arm_neon_vshifts:
4282 case Intrinsic::arm_neon_vshiftu:
4283 // Opcode already set above.
4285 case Intrinsic::arm_neon_vshiftls:
4286 case Intrinsic::arm_neon_vshiftlu:
4287 if (Cnt == VT.getVectorElementType().getSizeInBits())
4288 VShiftOpc = ARMISD::VSHLLi;
4290 VShiftOpc = (IntNo == Intrinsic::arm_neon_vshiftls ?
4291 ARMISD::VSHLLs : ARMISD::VSHLLu);
4293 case Intrinsic::arm_neon_vshiftn:
4294 VShiftOpc = ARMISD::VSHRN; break;
4295 case Intrinsic::arm_neon_vrshifts:
4296 VShiftOpc = ARMISD::VRSHRs; break;
4297 case Intrinsic::arm_neon_vrshiftu:
4298 VShiftOpc = ARMISD::VRSHRu; break;
4299 case Intrinsic::arm_neon_vrshiftn:
4300 VShiftOpc = ARMISD::VRSHRN; break;
4301 case Intrinsic::arm_neon_vqshifts:
4302 VShiftOpc = ARMISD::VQSHLs; break;
4303 case Intrinsic::arm_neon_vqshiftu:
4304 VShiftOpc = ARMISD::VQSHLu; break;
4305 case Intrinsic::arm_neon_vqshiftsu:
4306 VShiftOpc = ARMISD::VQSHLsu; break;
4307 case Intrinsic::arm_neon_vqshiftns:
4308 VShiftOpc = ARMISD::VQSHRNs; break;
4309 case Intrinsic::arm_neon_vqshiftnu:
4310 VShiftOpc = ARMISD::VQSHRNu; break;
4311 case Intrinsic::arm_neon_vqshiftnsu:
4312 VShiftOpc = ARMISD::VQSHRNsu; break;
4313 case Intrinsic::arm_neon_vqrshiftns:
4314 VShiftOpc = ARMISD::VQRSHRNs; break;
4315 case Intrinsic::arm_neon_vqrshiftnu:
4316 VShiftOpc = ARMISD::VQRSHRNu; break;
4317 case Intrinsic::arm_neon_vqrshiftnsu:
4318 VShiftOpc = ARMISD::VQRSHRNsu; break;
4321 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
4322 N->getOperand(1), DAG.getConstant(Cnt, MVT::i32));
4325 case Intrinsic::arm_neon_vshiftins: {
4326 EVT VT = N->getOperand(1).getValueType();
4328 unsigned VShiftOpc = 0;
4330 if (isVShiftLImm(N->getOperand(3), VT, false, Cnt))
4331 VShiftOpc = ARMISD::VSLI;
4332 else if (isVShiftRImm(N->getOperand(3), VT, false, true, Cnt))
4333 VShiftOpc = ARMISD::VSRI;
4335 llvm_unreachable("invalid shift count for vsli/vsri intrinsic");
4338 return DAG.getNode(VShiftOpc, N->getDebugLoc(), N->getValueType(0),
4339 N->getOperand(1), N->getOperand(2),
4340 DAG.getConstant(Cnt, MVT::i32));
4343 case Intrinsic::arm_neon_vqrshifts:
4344 case Intrinsic::arm_neon_vqrshiftu:
4345 // No immediate versions of these to check for.
4352 /// PerformShiftCombine - Checks for immediate versions of vector shifts and
4353 /// lowers them. As with the vector shift intrinsics, this is done during DAG
4354 /// combining instead of DAG legalizing because the build_vectors for 64-bit
4355 /// vector element shift counts are generally not legal, and it is hard to see
4356 /// their values after they get legalized to loads from a constant pool.
4357 static SDValue PerformShiftCombine(SDNode *N, SelectionDAG &DAG,
4358 const ARMSubtarget *ST) {
4359 EVT VT = N->getValueType(0);
4361 // Nothing to be done for scalar shifts.
4362 if (! VT.isVector())
4365 assert(ST->hasNEON() && "unexpected vector shift");
4368 switch (N->getOpcode()) {
4369 default: llvm_unreachable("unexpected shift opcode");
4372 if (isVShiftLImm(N->getOperand(1), VT, false, Cnt))
4373 return DAG.getNode(ARMISD::VSHL, N->getDebugLoc(), VT, N->getOperand(0),
4374 DAG.getConstant(Cnt, MVT::i32));
4379 if (isVShiftRImm(N->getOperand(1), VT, false, false, Cnt)) {
4380 unsigned VShiftOpc = (N->getOpcode() == ISD::SRA ?
4381 ARMISD::VSHRs : ARMISD::VSHRu);
4382 return DAG.getNode(VShiftOpc, N->getDebugLoc(), VT, N->getOperand(0),
4383 DAG.getConstant(Cnt, MVT::i32));
4389 /// PerformExtendCombine - Target-specific DAG combining for ISD::SIGN_EXTEND,
4390 /// ISD::ZERO_EXTEND, and ISD::ANY_EXTEND.
4391 static SDValue PerformExtendCombine(SDNode *N, SelectionDAG &DAG,
4392 const ARMSubtarget *ST) {
4393 SDValue N0 = N->getOperand(0);
4395 // Check for sign- and zero-extensions of vector extract operations of 8-
4396 // and 16-bit vector elements. NEON supports these directly. They are
4397 // handled during DAG combining because type legalization will promote them
4398 // to 32-bit types and it is messy to recognize the operations after that.
4399 if (ST->hasNEON() && N0.getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
4400 SDValue Vec = N0.getOperand(0);
4401 SDValue Lane = N0.getOperand(1);
4402 EVT VT = N->getValueType(0);
4403 EVT EltVT = N0.getValueType();
4404 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
4406 if (VT == MVT::i32 &&
4407 (EltVT == MVT::i8 || EltVT == MVT::i16) &&
4408 TLI.isTypeLegal(Vec.getValueType())) {
4411 switch (N->getOpcode()) {
4412 default: llvm_unreachable("unexpected opcode");
4413 case ISD::SIGN_EXTEND:
4414 Opc = ARMISD::VGETLANEs;
4416 case ISD::ZERO_EXTEND:
4417 case ISD::ANY_EXTEND:
4418 Opc = ARMISD::VGETLANEu;
4421 return DAG.getNode(Opc, N->getDebugLoc(), VT, Vec, Lane);
4428 /// PerformSELECT_CCCombine - Target-specific DAG combining for ISD::SELECT_CC
4429 /// to match f32 max/min patterns to use NEON vmax/vmin instructions.
4430 static SDValue PerformSELECT_CCCombine(SDNode *N, SelectionDAG &DAG,
4431 const ARMSubtarget *ST) {
4432 // If the target supports NEON, try to use vmax/vmin instructions for f32
4433 // selects like "x < y ? x : y". Unless the FiniteOnlyFPMath option is set,
4434 // be careful about NaNs: NEON's vmax/vmin return NaN if either operand is
4435 // a NaN; only do the transformation when it matches that behavior.
4437 // For now only do this when using NEON for FP operations; if using VFP, it
4438 // is not obvious that the benefit outweighs the cost of switching to the
4440 if (!ST->hasNEON() || !ST->useNEONForSinglePrecisionFP() ||
4441 N->getValueType(0) != MVT::f32)
4444 SDValue CondLHS = N->getOperand(0);
4445 SDValue CondRHS = N->getOperand(1);
4446 SDValue LHS = N->getOperand(2);
4447 SDValue RHS = N->getOperand(3);
4448 ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
4450 unsigned Opcode = 0;
4452 if (DAG.isEqualTo(LHS, CondLHS) && DAG.isEqualTo(RHS, CondRHS)) {
4453 IsReversed = false; // x CC y ? x : y
4454 } else if (DAG.isEqualTo(LHS, CondRHS) && DAG.isEqualTo(RHS, CondLHS)) {
4455 IsReversed = true ; // x CC y ? y : x
4469 // If LHS is NaN, an ordered comparison will be false and the result will
4470 // be the RHS, but vmin(NaN, RHS) = NaN. Avoid this by checking that LHS
4471 // != NaN. Likewise, for unordered comparisons, check for RHS != NaN.
4472 IsUnordered = (CC == ISD::SETULT || CC == ISD::SETULE);
4473 if (!DAG.isKnownNeverNaN(IsUnordered ? RHS : LHS))
4475 // For less-than-or-equal comparisons, "+0 <= -0" will be true but vmin
4476 // will return -0, so vmin can only be used for unsafe math or if one of
4477 // the operands is known to be nonzero.
4478 if ((CC == ISD::SETLE || CC == ISD::SETOLE || CC == ISD::SETULE) &&
4480 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
4482 Opcode = IsReversed ? ARMISD::FMAX : ARMISD::FMIN;
4491 // If LHS is NaN, an ordered comparison will be false and the result will
4492 // be the RHS, but vmax(NaN, RHS) = NaN. Avoid this by checking that LHS
4493 // != NaN. Likewise, for unordered comparisons, check for RHS != NaN.
4494 IsUnordered = (CC == ISD::SETUGT || CC == ISD::SETUGE);
4495 if (!DAG.isKnownNeverNaN(IsUnordered ? RHS : LHS))
4497 // For greater-than-or-equal comparisons, "-0 >= +0" will be true but vmax
4498 // will return +0, so vmax can only be used for unsafe math or if one of
4499 // the operands is known to be nonzero.
4500 if ((CC == ISD::SETGE || CC == ISD::SETOGE || CC == ISD::SETUGE) &&
4502 !(DAG.isKnownNeverZero(LHS) || DAG.isKnownNeverZero(RHS)))
4504 Opcode = IsReversed ? ARMISD::FMIN : ARMISD::FMAX;
4510 return DAG.getNode(Opcode, N->getDebugLoc(), N->getValueType(0), LHS, RHS);
4513 SDValue ARMTargetLowering::PerformDAGCombine(SDNode *N,
4514 DAGCombinerInfo &DCI) const {
4515 switch (N->getOpcode()) {
4517 case ISD::ADD: return PerformADDCombine(N, DCI);
4518 case ISD::SUB: return PerformSUBCombine(N, DCI);
4519 case ISD::MUL: return PerformMULCombine(N, DCI, Subtarget);
4520 case ARMISD::VMOVRRD: return PerformVMOVRRDCombine(N, DCI);
4521 case ISD::INTRINSIC_WO_CHAIN: return PerformIntrinsicCombine(N, DCI.DAG);
4524 case ISD::SRL: return PerformShiftCombine(N, DCI.DAG, Subtarget);
4525 case ISD::SIGN_EXTEND:
4526 case ISD::ZERO_EXTEND:
4527 case ISD::ANY_EXTEND: return PerformExtendCombine(N, DCI.DAG, Subtarget);
4528 case ISD::SELECT_CC: return PerformSELECT_CCCombine(N, DCI.DAG, Subtarget);
4533 bool ARMTargetLowering::allowsUnalignedMemoryAccesses(EVT VT) const {
4534 if (!Subtarget->hasV6Ops())
4535 // Pre-v6 does not support unaligned mem access.
4538 // v6+ may or may not support unaligned mem access depending on the system
4540 // FIXME: This is pretty conservative. Should we provide cmdline option to
4541 // control the behaviour?
4542 if (!Subtarget->isTargetDarwin())
4545 switch (VT.getSimpleVT().SimpleTy) {
4552 // FIXME: VLD1 etc with standard alignment is legal.
4556 static bool isLegalT1AddressImmediate(int64_t V, EVT VT) {
4561 switch (VT.getSimpleVT().SimpleTy) {
4562 default: return false;
4577 if ((V & (Scale - 1)) != 0)
4580 return V == (V & ((1LL << 5) - 1));
4583 static bool isLegalT2AddressImmediate(int64_t V, EVT VT,
4584 const ARMSubtarget *Subtarget) {
4591 switch (VT.getSimpleVT().SimpleTy) {
4592 default: return false;
4597 // + imm12 or - imm8
4599 return V == (V & ((1LL << 8) - 1));
4600 return V == (V & ((1LL << 12) - 1));
4603 // Same as ARM mode. FIXME: NEON?
4604 if (!Subtarget->hasVFP2())
4609 return V == (V & ((1LL << 8) - 1));
4613 /// isLegalAddressImmediate - Return true if the integer value can be used
4614 /// as the offset of the target addressing mode for load / store of the
4616 static bool isLegalAddressImmediate(int64_t V, EVT VT,
4617 const ARMSubtarget *Subtarget) {
4624 if (Subtarget->isThumb1Only())
4625 return isLegalT1AddressImmediate(V, VT);
4626 else if (Subtarget->isThumb2())
4627 return isLegalT2AddressImmediate(V, VT, Subtarget);
4632 switch (VT.getSimpleVT().SimpleTy) {
4633 default: return false;
4638 return V == (V & ((1LL << 12) - 1));
4641 return V == (V & ((1LL << 8) - 1));
4644 if (!Subtarget->hasVFP2()) // FIXME: NEON?
4649 return V == (V & ((1LL << 8) - 1));
4653 bool ARMTargetLowering::isLegalT2ScaledAddressingMode(const AddrMode &AM,
4655 int Scale = AM.Scale;
4659 switch (VT.getSimpleVT().SimpleTy) {
4660 default: return false;
4669 return Scale == 2 || Scale == 4 || Scale == 8;
4672 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
4676 // Note, we allow "void" uses (basically, uses that aren't loads or
4677 // stores), because arm allows folding a scale into many arithmetic
4678 // operations. This should be made more precise and revisited later.
4680 // Allow r << imm, but the imm has to be a multiple of two.
4681 if (Scale & 1) return false;
4682 return isPowerOf2_32(Scale);
4686 /// isLegalAddressingMode - Return true if the addressing mode represented
4687 /// by AM is legal for this target, for a load/store of the specified type.
4688 bool ARMTargetLowering::isLegalAddressingMode(const AddrMode &AM,
4689 const Type *Ty) const {
4690 EVT VT = getValueType(Ty, true);
4691 if (!isLegalAddressImmediate(AM.BaseOffs, VT, Subtarget))
4694 // Can never fold addr of global into load/store.
4699 case 0: // no scale reg, must be "r+i" or "r", or "i".
4702 if (Subtarget->isThumb1Only())
4706 // ARM doesn't support any R+R*scale+imm addr modes.
4713 if (Subtarget->isThumb2())
4714 return isLegalT2ScaledAddressingMode(AM, VT);
4716 int Scale = AM.Scale;
4717 switch (VT.getSimpleVT().SimpleTy) {
4718 default: return false;
4722 if (Scale < 0) Scale = -Scale;
4726 return isPowerOf2_32(Scale & ~1);
4730 if (((unsigned)AM.HasBaseReg + Scale) <= 2)
4735 // Note, we allow "void" uses (basically, uses that aren't loads or
4736 // stores), because arm allows folding a scale into many arithmetic
4737 // operations. This should be made more precise and revisited later.
4739 // Allow r << imm, but the imm has to be a multiple of two.
4740 if (Scale & 1) return false;
4741 return isPowerOf2_32(Scale);
4748 /// isLegalICmpImmediate - Return true if the specified immediate is legal
4749 /// icmp immediate, that is the target has icmp instructions which can compare
4750 /// a register against the immediate without having to materialize the
4751 /// immediate into a register.
4752 bool ARMTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
4753 if (!Subtarget->isThumb())
4754 return ARM_AM::getSOImmVal(Imm) != -1;
4755 if (Subtarget->isThumb2())
4756 return ARM_AM::getT2SOImmVal(Imm) != -1;
4757 return Imm >= 0 && Imm <= 255;
4760 static bool getARMIndexedAddressParts(SDNode *Ptr, EVT VT,
4761 bool isSEXTLoad, SDValue &Base,
4762 SDValue &Offset, bool &isInc,
4763 SelectionDAG &DAG) {
4764 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
4767 if (VT == MVT::i16 || ((VT == MVT::i8 || VT == MVT::i1) && isSEXTLoad)) {
4769 Base = Ptr->getOperand(0);
4770 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
4771 int RHSC = (int)RHS->getZExtValue();
4772 if (RHSC < 0 && RHSC > -256) {
4773 assert(Ptr->getOpcode() == ISD::ADD);
4775 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
4779 isInc = (Ptr->getOpcode() == ISD::ADD);
4780 Offset = Ptr->getOperand(1);
4782 } else if (VT == MVT::i32 || VT == MVT::i8 || VT == MVT::i1) {
4784 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
4785 int RHSC = (int)RHS->getZExtValue();
4786 if (RHSC < 0 && RHSC > -0x1000) {
4787 assert(Ptr->getOpcode() == ISD::ADD);
4789 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
4790 Base = Ptr->getOperand(0);
4795 if (Ptr->getOpcode() == ISD::ADD) {
4797 ARM_AM::ShiftOpc ShOpcVal= ARM_AM::getShiftOpcForNode(Ptr->getOperand(0));
4798 if (ShOpcVal != ARM_AM::no_shift) {
4799 Base = Ptr->getOperand(1);
4800 Offset = Ptr->getOperand(0);
4802 Base = Ptr->getOperand(0);
4803 Offset = Ptr->getOperand(1);
4808 isInc = (Ptr->getOpcode() == ISD::ADD);
4809 Base = Ptr->getOperand(0);
4810 Offset = Ptr->getOperand(1);
4814 // FIXME: Use VLDM / VSTM to emulate indexed FP load / store.
4818 static bool getT2IndexedAddressParts(SDNode *Ptr, EVT VT,
4819 bool isSEXTLoad, SDValue &Base,
4820 SDValue &Offset, bool &isInc,
4821 SelectionDAG &DAG) {
4822 if (Ptr->getOpcode() != ISD::ADD && Ptr->getOpcode() != ISD::SUB)
4825 Base = Ptr->getOperand(0);
4826 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Ptr->getOperand(1))) {
4827 int RHSC = (int)RHS->getZExtValue();
4828 if (RHSC < 0 && RHSC > -0x100) { // 8 bits.
4829 assert(Ptr->getOpcode() == ISD::ADD);
4831 Offset = DAG.getConstant(-RHSC, RHS->getValueType(0));
4833 } else if (RHSC > 0 && RHSC < 0x100) { // 8 bit, no zero.
4834 isInc = Ptr->getOpcode() == ISD::ADD;
4835 Offset = DAG.getConstant(RHSC, RHS->getValueType(0));
4843 /// getPreIndexedAddressParts - returns true by value, base pointer and
4844 /// offset pointer and addressing mode by reference if the node's address
4845 /// can be legally represented as pre-indexed load / store address.
4847 ARMTargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
4849 ISD::MemIndexedMode &AM,
4850 SelectionDAG &DAG) const {
4851 if (Subtarget->isThumb1Only())
4856 bool isSEXTLoad = false;
4857 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
4858 Ptr = LD->getBasePtr();
4859 VT = LD->getMemoryVT();
4860 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
4861 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
4862 Ptr = ST->getBasePtr();
4863 VT = ST->getMemoryVT();
4868 bool isLegal = false;
4869 if (Subtarget->isThumb2())
4870 isLegal = getT2IndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
4871 Offset, isInc, DAG);
4873 isLegal = getARMIndexedAddressParts(Ptr.getNode(), VT, isSEXTLoad, Base,
4874 Offset, isInc, DAG);
4878 AM = isInc ? ISD::PRE_INC : ISD::PRE_DEC;
4882 /// getPostIndexedAddressParts - returns true by value, base pointer and
4883 /// offset pointer and addressing mode by reference if this node can be
4884 /// combined with a load / store to form a post-indexed load / store.
4885 bool ARMTargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
4888 ISD::MemIndexedMode &AM,
4889 SelectionDAG &DAG) const {
4890 if (Subtarget->isThumb1Only())
4895 bool isSEXTLoad = false;
4896 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
4897 VT = LD->getMemoryVT();
4898 Ptr = LD->getBasePtr();
4899 isSEXTLoad = LD->getExtensionType() == ISD::SEXTLOAD;
4900 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
4901 VT = ST->getMemoryVT();
4902 Ptr = ST->getBasePtr();
4907 bool isLegal = false;
4908 if (Subtarget->isThumb2())
4909 isLegal = getT2IndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
4912 isLegal = getARMIndexedAddressParts(Op, VT, isSEXTLoad, Base, Offset,
4918 // Swap base ptr and offset to catch more post-index load / store when
4919 // it's legal. In Thumb2 mode, offset must be an immediate.
4920 if (Ptr == Offset && Op->getOpcode() == ISD::ADD &&
4921 !Subtarget->isThumb2())
4922 std::swap(Base, Offset);
4924 // Post-indexed load / store update the base pointer.
4929 AM = isInc ? ISD::POST_INC : ISD::POST_DEC;
4933 void ARMTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
4937 const SelectionDAG &DAG,
4938 unsigned Depth) const {
4939 KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0);
4940 switch (Op.getOpcode()) {
4942 case ARMISD::CMOV: {
4943 // Bits are known zero/one if known on the LHS and RHS.
4944 DAG.ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
4945 if (KnownZero == 0 && KnownOne == 0) return;
4947 APInt KnownZeroRHS, KnownOneRHS;
4948 DAG.ComputeMaskedBits(Op.getOperand(1), Mask,
4949 KnownZeroRHS, KnownOneRHS, Depth+1);
4950 KnownZero &= KnownZeroRHS;
4951 KnownOne &= KnownOneRHS;
4957 //===----------------------------------------------------------------------===//
4958 // ARM Inline Assembly Support
4959 //===----------------------------------------------------------------------===//
4961 /// getConstraintType - Given a constraint letter, return the type of
4962 /// constraint it is for this target.
4963 ARMTargetLowering::ConstraintType
4964 ARMTargetLowering::getConstraintType(const std::string &Constraint) const {
4965 if (Constraint.size() == 1) {
4966 switch (Constraint[0]) {
4968 case 'l': return C_RegisterClass;
4969 case 'w': return C_RegisterClass;
4972 return TargetLowering::getConstraintType(Constraint);
4975 std::pair<unsigned, const TargetRegisterClass*>
4976 ARMTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
4978 if (Constraint.size() == 1) {
4979 // GCC ARM Constraint Letters
4980 switch (Constraint[0]) {
4982 if (Subtarget->isThumb())
4983 return std::make_pair(0U, ARM::tGPRRegisterClass);
4985 return std::make_pair(0U, ARM::GPRRegisterClass);
4987 return std::make_pair(0U, ARM::GPRRegisterClass);
4990 return std::make_pair(0U, ARM::SPRRegisterClass);
4991 if (VT.getSizeInBits() == 64)
4992 return std::make_pair(0U, ARM::DPRRegisterClass);
4993 if (VT.getSizeInBits() == 128)
4994 return std::make_pair(0U, ARM::QPRRegisterClass);
4998 if (StringRef("{cc}").equals_lower(Constraint))
4999 return std::make_pair(unsigned(ARM::CPSR), ARM::CCRRegisterClass);
5001 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
5004 std::vector<unsigned> ARMTargetLowering::
5005 getRegClassForInlineAsmConstraint(const std::string &Constraint,
5007 if (Constraint.size() != 1)
5008 return std::vector<unsigned>();
5010 switch (Constraint[0]) { // GCC ARM Constraint Letters
5013 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
5014 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
5017 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
5018 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
5019 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
5020 ARM::R12, ARM::LR, 0);
5023 return make_vector<unsigned>(ARM::S0, ARM::S1, ARM::S2, ARM::S3,
5024 ARM::S4, ARM::S5, ARM::S6, ARM::S7,
5025 ARM::S8, ARM::S9, ARM::S10, ARM::S11,
5026 ARM::S12,ARM::S13,ARM::S14,ARM::S15,
5027 ARM::S16,ARM::S17,ARM::S18,ARM::S19,
5028 ARM::S20,ARM::S21,ARM::S22,ARM::S23,
5029 ARM::S24,ARM::S25,ARM::S26,ARM::S27,
5030 ARM::S28,ARM::S29,ARM::S30,ARM::S31, 0);
5031 if (VT.getSizeInBits() == 64)
5032 return make_vector<unsigned>(ARM::D0, ARM::D1, ARM::D2, ARM::D3,
5033 ARM::D4, ARM::D5, ARM::D6, ARM::D7,
5034 ARM::D8, ARM::D9, ARM::D10,ARM::D11,
5035 ARM::D12,ARM::D13,ARM::D14,ARM::D15, 0);
5036 if (VT.getSizeInBits() == 128)
5037 return make_vector<unsigned>(ARM::Q0, ARM::Q1, ARM::Q2, ARM::Q3,
5038 ARM::Q4, ARM::Q5, ARM::Q6, ARM::Q7, 0);
5042 return std::vector<unsigned>();
5045 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
5046 /// vector. If it is invalid, don't add anything to Ops.
5047 void ARMTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
5049 std::vector<SDValue>&Ops,
5050 SelectionDAG &DAG) const {
5051 SDValue Result(0, 0);
5053 switch (Constraint) {
5055 case 'I': case 'J': case 'K': case 'L':
5056 case 'M': case 'N': case 'O':
5057 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
5061 int64_t CVal64 = C->getSExtValue();
5062 int CVal = (int) CVal64;
5063 // None of these constraints allow values larger than 32 bits. Check
5064 // that the value fits in an int.
5068 switch (Constraint) {
5070 if (Subtarget->isThumb1Only()) {
5071 // This must be a constant between 0 and 255, for ADD
5073 if (CVal >= 0 && CVal <= 255)
5075 } else if (Subtarget->isThumb2()) {
5076 // A constant that can be used as an immediate value in a
5077 // data-processing instruction.
5078 if (ARM_AM::getT2SOImmVal(CVal) != -1)
5081 // A constant that can be used as an immediate value in a
5082 // data-processing instruction.
5083 if (ARM_AM::getSOImmVal(CVal) != -1)
5089 if (Subtarget->isThumb()) { // FIXME thumb2
5090 // This must be a constant between -255 and -1, for negated ADD
5091 // immediates. This can be used in GCC with an "n" modifier that
5092 // prints the negated value, for use with SUB instructions. It is
5093 // not useful otherwise but is implemented for compatibility.
5094 if (CVal >= -255 && CVal <= -1)
5097 // This must be a constant between -4095 and 4095. It is not clear
5098 // what this constraint is intended for. Implemented for
5099 // compatibility with GCC.
5100 if (CVal >= -4095 && CVal <= 4095)
5106 if (Subtarget->isThumb1Only()) {
5107 // A 32-bit value where only one byte has a nonzero value. Exclude
5108 // zero to match GCC. This constraint is used by GCC internally for
5109 // constants that can be loaded with a move/shift combination.
5110 // It is not useful otherwise but is implemented for compatibility.
5111 if (CVal != 0 && ARM_AM::isThumbImmShiftedVal(CVal))
5113 } else if (Subtarget->isThumb2()) {
5114 // A constant whose bitwise inverse can be used as an immediate
5115 // value in a data-processing instruction. This can be used in GCC
5116 // with a "B" modifier that prints the inverted value, for use with
5117 // BIC and MVN instructions. It is not useful otherwise but is
5118 // implemented for compatibility.
5119 if (ARM_AM::getT2SOImmVal(~CVal) != -1)
5122 // A constant whose bitwise inverse can be used as an immediate
5123 // value in a data-processing instruction. This can be used in GCC
5124 // with a "B" modifier that prints the inverted value, for use with
5125 // BIC and MVN instructions. It is not useful otherwise but is
5126 // implemented for compatibility.
5127 if (ARM_AM::getSOImmVal(~CVal) != -1)
5133 if (Subtarget->isThumb1Only()) {
5134 // This must be a constant between -7 and 7,
5135 // for 3-operand ADD/SUB immediate instructions.
5136 if (CVal >= -7 && CVal < 7)
5138 } else if (Subtarget->isThumb2()) {
5139 // A constant whose negation can be used as an immediate value in a
5140 // data-processing instruction. This can be used in GCC with an "n"
5141 // modifier that prints the negated value, for use with SUB
5142 // instructions. It is not useful otherwise but is implemented for
5144 if (ARM_AM::getT2SOImmVal(-CVal) != -1)
5147 // A constant whose negation can be used as an immediate value in a
5148 // data-processing instruction. This can be used in GCC with an "n"
5149 // modifier that prints the negated value, for use with SUB
5150 // instructions. It is not useful otherwise but is implemented for
5152 if (ARM_AM::getSOImmVal(-CVal) != -1)
5158 if (Subtarget->isThumb()) { // FIXME thumb2
5159 // This must be a multiple of 4 between 0 and 1020, for
5160 // ADD sp + immediate.
5161 if ((CVal >= 0 && CVal <= 1020) && ((CVal & 3) == 0))
5164 // A power of two or a constant between 0 and 32. This is used in
5165 // GCC for the shift amount on shifted register operands, but it is
5166 // useful in general for any shift amounts.
5167 if ((CVal >= 0 && CVal <= 32) || ((CVal & (CVal - 1)) == 0))
5173 if (Subtarget->isThumb()) { // FIXME thumb2
5174 // This must be a constant between 0 and 31, for shift amounts.
5175 if (CVal >= 0 && CVal <= 31)
5181 if (Subtarget->isThumb()) { // FIXME thumb2
5182 // This must be a multiple of 4 between -508 and 508, for
5183 // ADD/SUB sp = sp + immediate.
5184 if ((CVal >= -508 && CVal <= 508) && ((CVal & 3) == 0))
5189 Result = DAG.getTargetConstant(CVal, Op.getValueType());
5193 if (Result.getNode()) {
5194 Ops.push_back(Result);
5197 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
5201 ARMTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
5202 // The ARM target isn't yet aware of offsets.
5206 int ARM::getVFPf32Imm(const APFloat &FPImm) {
5207 APInt Imm = FPImm.bitcastToAPInt();
5208 uint32_t Sign = Imm.lshr(31).getZExtValue() & 1;
5209 int32_t Exp = (Imm.lshr(23).getSExtValue() & 0xff) - 127; // -126 to 127
5210 int64_t Mantissa = Imm.getZExtValue() & 0x7fffff; // 23 bits
5212 // We can handle 4 bits of mantissa.
5213 // mantissa = (16+UInt(e:f:g:h))/16.
5214 if (Mantissa & 0x7ffff)
5217 if ((Mantissa & 0xf) != Mantissa)
5220 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
5221 if (Exp < -3 || Exp > 4)
5223 Exp = ((Exp+3) & 0x7) ^ 4;
5225 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
5228 int ARM::getVFPf64Imm(const APFloat &FPImm) {
5229 APInt Imm = FPImm.bitcastToAPInt();
5230 uint64_t Sign = Imm.lshr(63).getZExtValue() & 1;
5231 int64_t Exp = (Imm.lshr(52).getSExtValue() & 0x7ff) - 1023; // -1022 to 1023
5232 uint64_t Mantissa = Imm.getZExtValue() & 0xfffffffffffffLL;
5234 // We can handle 4 bits of mantissa.
5235 // mantissa = (16+UInt(e:f:g:h))/16.
5236 if (Mantissa & 0xffffffffffffLL)
5239 if ((Mantissa & 0xf) != Mantissa)
5242 // We can handle 3 bits of exponent: exp == UInt(NOT(b):c:d)-3
5243 if (Exp < -3 || Exp > 4)
5245 Exp = ((Exp+3) & 0x7) ^ 4;
5247 return ((int)Sign << 7) | (Exp << 4) | Mantissa;
5250 /// isFPImmLegal - Returns true if the target can instruction select the
5251 /// specified FP immediate natively. If false, the legalizer will
5252 /// materialize the FP immediate as a load from a constant pool.
5253 bool ARMTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
5254 if (!Subtarget->hasVFP3())
5257 return ARM::getVFPf32Imm(Imm) != -1;
5259 return ARM::getVFPf64Imm(Imm) != -1;