1 //===-- AArch6464FastISel.cpp - AArch64 FastISel 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 AArch64-specific support for the FastISel class. Some
11 // of the target-specific code is generated by tablegen in the file
12 // AArch64GenFastISel.inc, which is #included here.
14 //===----------------------------------------------------------------------===//
17 #include "AArch64CallingConvention.h"
18 #include "AArch64Subtarget.h"
19 #include "AArch64TargetMachine.h"
20 #include "MCTargetDesc/AArch64AddressingModes.h"
21 #include "llvm/Analysis/BranchProbabilityInfo.h"
22 #include "llvm/CodeGen/CallingConvLower.h"
23 #include "llvm/CodeGen/FastISel.h"
24 #include "llvm/CodeGen/FunctionLoweringInfo.h"
25 #include "llvm/CodeGen/MachineConstantPool.h"
26 #include "llvm/CodeGen/MachineFrameInfo.h"
27 #include "llvm/CodeGen/MachineInstrBuilder.h"
28 #include "llvm/CodeGen/MachineRegisterInfo.h"
29 #include "llvm/IR/CallingConv.h"
30 #include "llvm/IR/DataLayout.h"
31 #include "llvm/IR/DerivedTypes.h"
32 #include "llvm/IR/Function.h"
33 #include "llvm/IR/GetElementPtrTypeIterator.h"
34 #include "llvm/IR/GlobalAlias.h"
35 #include "llvm/IR/GlobalVariable.h"
36 #include "llvm/IR/Instructions.h"
37 #include "llvm/IR/IntrinsicInst.h"
38 #include "llvm/IR/Operator.h"
39 #include "llvm/MC/MCSymbol.h"
40 #include "llvm/Support/CommandLine.h"
45 class AArch64FastISel final : public FastISel {
55 AArch64_AM::ShiftExtendType ExtType;
63 const GlobalValue *GV;
66 Address() : Kind(RegBase), ExtType(AArch64_AM::InvalidShiftExtend),
67 OffsetReg(0), Shift(0), Offset(0), GV(nullptr) { Base.Reg = 0; }
68 void setKind(BaseKind K) { Kind = K; }
69 BaseKind getKind() const { return Kind; }
70 void setExtendType(AArch64_AM::ShiftExtendType E) { ExtType = E; }
71 AArch64_AM::ShiftExtendType getExtendType() const { return ExtType; }
72 bool isRegBase() const { return Kind == RegBase; }
73 bool isFIBase() const { return Kind == FrameIndexBase; }
74 void setReg(unsigned Reg) {
75 assert(isRegBase() && "Invalid base register access!");
78 unsigned getReg() const {
79 assert(isRegBase() && "Invalid base register access!");
82 void setOffsetReg(unsigned Reg) {
85 unsigned getOffsetReg() const {
88 void setFI(unsigned FI) {
89 assert(isFIBase() && "Invalid base frame index access!");
92 unsigned getFI() const {
93 assert(isFIBase() && "Invalid base frame index access!");
96 void setOffset(int64_t O) { Offset = O; }
97 int64_t getOffset() { return Offset; }
98 void setShift(unsigned S) { Shift = S; }
99 unsigned getShift() { return Shift; }
101 void setGlobalValue(const GlobalValue *G) { GV = G; }
102 const GlobalValue *getGlobalValue() { return GV; }
105 /// Subtarget - Keep a pointer to the AArch64Subtarget around so that we can
106 /// make the right decision when generating code for different targets.
107 const AArch64Subtarget *Subtarget;
108 LLVMContext *Context;
110 bool fastLowerArguments() override;
111 bool fastLowerCall(CallLoweringInfo &CLI) override;
112 bool fastLowerIntrinsicCall(const IntrinsicInst *II) override;
115 // Selection routines.
116 bool selectAddSub(const Instruction *I);
117 bool selectLogicalOp(const Instruction *I);
118 bool selectLoad(const Instruction *I);
119 bool selectStore(const Instruction *I);
120 bool selectBranch(const Instruction *I);
121 bool selectIndirectBr(const Instruction *I);
122 bool selectCmp(const Instruction *I);
123 bool selectSelect(const Instruction *I);
124 bool selectFPExt(const Instruction *I);
125 bool selectFPTrunc(const Instruction *I);
126 bool selectFPToInt(const Instruction *I, bool Signed);
127 bool selectIntToFP(const Instruction *I, bool Signed);
128 bool selectRem(const Instruction *I, unsigned ISDOpcode);
129 bool selectRet(const Instruction *I);
130 bool selectTrunc(const Instruction *I);
131 bool selectIntExt(const Instruction *I);
132 bool selectMul(const Instruction *I);
133 bool selectShift(const Instruction *I);
134 bool selectBitCast(const Instruction *I);
135 bool selectFRem(const Instruction *I);
136 bool selectSDiv(const Instruction *I);
137 bool selectGetElementPtr(const Instruction *I);
139 // Utility helper routines.
140 bool isTypeLegal(Type *Ty, MVT &VT);
141 bool isTypeSupported(Type *Ty, MVT &VT, bool IsVectorAllowed = false);
142 bool isValueAvailable(const Value *V) const;
143 bool computeAddress(const Value *Obj, Address &Addr, Type *Ty = nullptr);
144 bool computeCallAddress(const Value *V, Address &Addr);
145 bool simplifyAddress(Address &Addr, MVT VT);
146 void addLoadStoreOperands(Address &Addr, const MachineInstrBuilder &MIB,
147 unsigned Flags, unsigned ScaleFactor,
148 MachineMemOperand *MMO);
149 bool isMemCpySmall(uint64_t Len, unsigned Alignment);
150 bool tryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len,
152 bool foldXALUIntrinsic(AArch64CC::CondCode &CC, const Instruction *I,
154 bool optimizeIntExtLoad(const Instruction *I, MVT RetVT, MVT SrcVT);
155 bool optimizeSelect(const SelectInst *SI);
156 std::pair<unsigned, bool> getRegForGEPIndex(const Value *Idx);
158 // Emit helper routines.
159 unsigned emitAddSub(bool UseAdd, MVT RetVT, const Value *LHS,
160 const Value *RHS, bool SetFlags = false,
161 bool WantResult = true, bool IsZExt = false);
162 unsigned emitAddSub_rr(bool UseAdd, MVT RetVT, unsigned LHSReg,
163 bool LHSIsKill, unsigned RHSReg, bool RHSIsKill,
164 bool SetFlags = false, bool WantResult = true);
165 unsigned emitAddSub_ri(bool UseAdd, MVT RetVT, unsigned LHSReg,
166 bool LHSIsKill, uint64_t Imm, bool SetFlags = false,
167 bool WantResult = true);
168 unsigned emitAddSub_rs(bool UseAdd, MVT RetVT, unsigned LHSReg,
169 bool LHSIsKill, unsigned RHSReg, bool RHSIsKill,
170 AArch64_AM::ShiftExtendType ShiftType,
171 uint64_t ShiftImm, bool SetFlags = false,
172 bool WantResult = true);
173 unsigned emitAddSub_rx(bool UseAdd, MVT RetVT, unsigned LHSReg,
174 bool LHSIsKill, unsigned RHSReg, bool RHSIsKill,
175 AArch64_AM::ShiftExtendType ExtType,
176 uint64_t ShiftImm, bool SetFlags = false,
177 bool WantResult = true);
180 bool emitCompareAndBranch(const BranchInst *BI);
181 bool emitCmp(const Value *LHS, const Value *RHS, bool IsZExt);
182 bool emitICmp(MVT RetVT, const Value *LHS, const Value *RHS, bool IsZExt);
183 bool emitICmp_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill, uint64_t Imm);
184 bool emitFCmp(MVT RetVT, const Value *LHS, const Value *RHS);
185 unsigned emitLoad(MVT VT, MVT ResultVT, Address Addr, bool WantZExt = true,
186 MachineMemOperand *MMO = nullptr);
187 bool emitStore(MVT VT, unsigned SrcReg, Address Addr,
188 MachineMemOperand *MMO = nullptr);
189 unsigned emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT, bool isZExt);
190 unsigned emiti1Ext(unsigned SrcReg, MVT DestVT, bool isZExt);
191 unsigned emitAdd(MVT RetVT, const Value *LHS, const Value *RHS,
192 bool SetFlags = false, bool WantResult = true,
193 bool IsZExt = false);
194 unsigned emitAdd_ri_(MVT VT, unsigned Op0, bool Op0IsKill, int64_t Imm);
195 unsigned emitSub(MVT RetVT, const Value *LHS, const Value *RHS,
196 bool SetFlags = false, bool WantResult = true,
197 bool IsZExt = false);
198 unsigned emitSubs_rr(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
199 unsigned RHSReg, bool RHSIsKill, bool WantResult = true);
200 unsigned emitSubs_rs(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
201 unsigned RHSReg, bool RHSIsKill,
202 AArch64_AM::ShiftExtendType ShiftType, uint64_t ShiftImm,
203 bool WantResult = true);
204 unsigned emitLogicalOp(unsigned ISDOpc, MVT RetVT, const Value *LHS,
206 unsigned emitLogicalOp_ri(unsigned ISDOpc, MVT RetVT, unsigned LHSReg,
207 bool LHSIsKill, uint64_t Imm);
208 unsigned emitLogicalOp_rs(unsigned ISDOpc, MVT RetVT, unsigned LHSReg,
209 bool LHSIsKill, unsigned RHSReg, bool RHSIsKill,
211 unsigned emitAnd_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill, uint64_t Imm);
212 unsigned emitMul_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
213 unsigned Op1, bool Op1IsKill);
214 unsigned emitSMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
215 unsigned Op1, bool Op1IsKill);
216 unsigned emitUMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
217 unsigned Op1, bool Op1IsKill);
218 unsigned emitLSL_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
219 unsigned Op1Reg, bool Op1IsKill);
220 unsigned emitLSL_ri(MVT RetVT, MVT SrcVT, unsigned Op0Reg, bool Op0IsKill,
221 uint64_t Imm, bool IsZExt = true);
222 unsigned emitLSR_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
223 unsigned Op1Reg, bool Op1IsKill);
224 unsigned emitLSR_ri(MVT RetVT, MVT SrcVT, unsigned Op0Reg, bool Op0IsKill,
225 uint64_t Imm, bool IsZExt = true);
226 unsigned emitASR_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
227 unsigned Op1Reg, bool Op1IsKill);
228 unsigned emitASR_ri(MVT RetVT, MVT SrcVT, unsigned Op0Reg, bool Op0IsKill,
229 uint64_t Imm, bool IsZExt = false);
231 unsigned materializeInt(const ConstantInt *CI, MVT VT);
232 unsigned materializeFP(const ConstantFP *CFP, MVT VT);
233 unsigned materializeGV(const GlobalValue *GV);
235 // Call handling routines.
237 CCAssignFn *CCAssignFnForCall(CallingConv::ID CC) const;
238 bool processCallArgs(CallLoweringInfo &CLI, SmallVectorImpl<MVT> &ArgVTs,
240 bool finishCall(CallLoweringInfo &CLI, MVT RetVT, unsigned NumBytes);
243 // Backend specific FastISel code.
244 unsigned fastMaterializeAlloca(const AllocaInst *AI) override;
245 unsigned fastMaterializeConstant(const Constant *C) override;
246 unsigned fastMaterializeFloatZero(const ConstantFP* CF) override;
248 explicit AArch64FastISel(FunctionLoweringInfo &FuncInfo,
249 const TargetLibraryInfo *LibInfo)
250 : FastISel(FuncInfo, LibInfo, /*SkipTargetIndependentISel=*/true) {
252 &static_cast<const AArch64Subtarget &>(FuncInfo.MF->getSubtarget());
253 Context = &FuncInfo.Fn->getContext();
256 bool fastSelectInstruction(const Instruction *I) override;
258 #include "AArch64GenFastISel.inc"
261 } // end anonymous namespace
263 #include "AArch64GenCallingConv.inc"
265 /// \brief Check if the sign-/zero-extend will be a noop.
266 static bool isIntExtFree(const Instruction *I) {
267 assert((isa<ZExtInst>(I) || isa<SExtInst>(I)) &&
268 "Unexpected integer extend instruction.");
269 assert(!I->getType()->isVectorTy() && I->getType()->isIntegerTy() &&
270 "Unexpected value type.");
271 bool IsZExt = isa<ZExtInst>(I);
273 if (const auto *LI = dyn_cast<LoadInst>(I->getOperand(0)))
277 if (const auto *Arg = dyn_cast<Argument>(I->getOperand(0)))
278 if ((IsZExt && Arg->hasZExtAttr()) || (!IsZExt && Arg->hasSExtAttr()))
284 /// \brief Determine the implicit scale factor that is applied by a memory
285 /// operation for a given value type.
286 static unsigned getImplicitScaleFactor(MVT VT) {
287 switch (VT.SimpleTy) {
290 case MVT::i1: // fall-through
295 case MVT::i32: // fall-through
298 case MVT::i64: // fall-through
304 CCAssignFn *AArch64FastISel::CCAssignFnForCall(CallingConv::ID CC) const {
305 if (CC == CallingConv::WebKit_JS)
306 return CC_AArch64_WebKit_JS;
307 if (CC == CallingConv::GHC)
308 return CC_AArch64_GHC;
309 return Subtarget->isTargetDarwin() ? CC_AArch64_DarwinPCS : CC_AArch64_AAPCS;
312 unsigned AArch64FastISel::fastMaterializeAlloca(const AllocaInst *AI) {
313 assert(TLI.getValueType(DL, AI->getType(), true) == MVT::i64 &&
314 "Alloca should always return a pointer.");
316 // Don't handle dynamic allocas.
317 if (!FuncInfo.StaticAllocaMap.count(AI))
320 DenseMap<const AllocaInst *, int>::iterator SI =
321 FuncInfo.StaticAllocaMap.find(AI);
323 if (SI != FuncInfo.StaticAllocaMap.end()) {
324 unsigned ResultReg = createResultReg(&AArch64::GPR64spRegClass);
325 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADDXri),
327 .addFrameIndex(SI->second)
336 unsigned AArch64FastISel::materializeInt(const ConstantInt *CI, MVT VT) {
341 return fastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
343 // Create a copy from the zero register to materialize a "0" value.
344 const TargetRegisterClass *RC = (VT == MVT::i64) ? &AArch64::GPR64RegClass
345 : &AArch64::GPR32RegClass;
346 unsigned ZeroReg = (VT == MVT::i64) ? AArch64::XZR : AArch64::WZR;
347 unsigned ResultReg = createResultReg(RC);
348 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TargetOpcode::COPY),
349 ResultReg).addReg(ZeroReg, getKillRegState(true));
353 unsigned AArch64FastISel::materializeFP(const ConstantFP *CFP, MVT VT) {
354 // Positive zero (+0.0) has to be materialized with a fmov from the zero
355 // register, because the immediate version of fmov cannot encode zero.
356 if (CFP->isNullValue())
357 return fastMaterializeFloatZero(CFP);
359 if (VT != MVT::f32 && VT != MVT::f64)
362 const APFloat Val = CFP->getValueAPF();
363 bool Is64Bit = (VT == MVT::f64);
364 // This checks to see if we can use FMOV instructions to materialize
365 // a constant, otherwise we have to materialize via the constant pool.
366 if (TLI.isFPImmLegal(Val, VT)) {
368 Is64Bit ? AArch64_AM::getFP64Imm(Val) : AArch64_AM::getFP32Imm(Val);
369 assert((Imm != -1) && "Cannot encode floating-point constant.");
370 unsigned Opc = Is64Bit ? AArch64::FMOVDi : AArch64::FMOVSi;
371 return fastEmitInst_i(Opc, TLI.getRegClassFor(VT), Imm);
374 // For the MachO large code model materialize the FP constant in code.
375 if (Subtarget->isTargetMachO() && TM.getCodeModel() == CodeModel::Large) {
376 unsigned Opc1 = Is64Bit ? AArch64::MOVi64imm : AArch64::MOVi32imm;
377 const TargetRegisterClass *RC = Is64Bit ?
378 &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
380 unsigned TmpReg = createResultReg(RC);
381 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc1), TmpReg)
382 .addImm(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
384 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
385 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
386 TII.get(TargetOpcode::COPY), ResultReg)
387 .addReg(TmpReg, getKillRegState(true));
392 // Materialize via constant pool. MachineConstantPool wants an explicit
394 unsigned Align = DL.getPrefTypeAlignment(CFP->getType());
396 Align = DL.getTypeAllocSize(CFP->getType());
398 unsigned CPI = MCP.getConstantPoolIndex(cast<Constant>(CFP), Align);
399 unsigned ADRPReg = createResultReg(&AArch64::GPR64commonRegClass);
400 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
401 ADRPReg).addConstantPoolIndex(CPI, 0, AArch64II::MO_PAGE);
403 unsigned Opc = Is64Bit ? AArch64::LDRDui : AArch64::LDRSui;
404 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
405 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
407 .addConstantPoolIndex(CPI, 0, AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
411 unsigned AArch64FastISel::materializeGV(const GlobalValue *GV) {
412 // We can't handle thread-local variables quickly yet.
413 if (GV->isThreadLocal())
416 // MachO still uses GOT for large code-model accesses, but ELF requires
417 // movz/movk sequences, which FastISel doesn't handle yet.
418 if (TM.getCodeModel() != CodeModel::Small && !Subtarget->isTargetMachO())
421 unsigned char OpFlags = Subtarget->ClassifyGlobalReference(GV, TM);
423 EVT DestEVT = TLI.getValueType(DL, GV->getType(), true);
424 if (!DestEVT.isSimple())
427 unsigned ADRPReg = createResultReg(&AArch64::GPR64commonRegClass);
430 if (OpFlags & AArch64II::MO_GOT) {
432 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
434 .addGlobalAddress(GV, 0, AArch64II::MO_GOT | AArch64II::MO_PAGE);
436 ResultReg = createResultReg(&AArch64::GPR64RegClass);
437 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::LDRXui),
440 .addGlobalAddress(GV, 0, AArch64II::MO_GOT | AArch64II::MO_PAGEOFF |
442 } else if (OpFlags & AArch64II::MO_CONSTPOOL) {
443 // We can't handle addresses loaded from a constant pool quickly yet.
447 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
449 .addGlobalAddress(GV, 0, AArch64II::MO_PAGE);
451 ResultReg = createResultReg(&AArch64::GPR64spRegClass);
452 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADDXri),
455 .addGlobalAddress(GV, 0, AArch64II::MO_PAGEOFF | AArch64II::MO_NC)
461 unsigned AArch64FastISel::fastMaterializeConstant(const Constant *C) {
462 EVT CEVT = TLI.getValueType(DL, C->getType(), true);
464 // Only handle simple types.
465 if (!CEVT.isSimple())
467 MVT VT = CEVT.getSimpleVT();
469 if (const auto *CI = dyn_cast<ConstantInt>(C))
470 return materializeInt(CI, VT);
471 else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C))
472 return materializeFP(CFP, VT);
473 else if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
474 return materializeGV(GV);
479 unsigned AArch64FastISel::fastMaterializeFloatZero(const ConstantFP* CFP) {
480 assert(CFP->isNullValue() &&
481 "Floating-point constant is not a positive zero.");
483 if (!isTypeLegal(CFP->getType(), VT))
486 if (VT != MVT::f32 && VT != MVT::f64)
489 bool Is64Bit = (VT == MVT::f64);
490 unsigned ZReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
491 unsigned Opc = Is64Bit ? AArch64::FMOVXDr : AArch64::FMOVWSr;
492 return fastEmitInst_r(Opc, TLI.getRegClassFor(VT), ZReg, /*IsKill=*/true);
495 /// \brief Check if the multiply is by a power-of-2 constant.
496 static bool isMulPowOf2(const Value *I) {
497 if (const auto *MI = dyn_cast<MulOperator>(I)) {
498 if (const auto *C = dyn_cast<ConstantInt>(MI->getOperand(0)))
499 if (C->getValue().isPowerOf2())
501 if (const auto *C = dyn_cast<ConstantInt>(MI->getOperand(1)))
502 if (C->getValue().isPowerOf2())
508 // Computes the address to get to an object.
509 bool AArch64FastISel::computeAddress(const Value *Obj, Address &Addr, Type *Ty)
511 const User *U = nullptr;
512 unsigned Opcode = Instruction::UserOp1;
513 if (const Instruction *I = dyn_cast<Instruction>(Obj)) {
514 // Don't walk into other basic blocks unless the object is an alloca from
515 // another block, otherwise it may not have a virtual register assigned.
516 if (FuncInfo.StaticAllocaMap.count(static_cast<const AllocaInst *>(Obj)) ||
517 FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
518 Opcode = I->getOpcode();
521 } else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(Obj)) {
522 Opcode = C->getOpcode();
526 if (auto *Ty = dyn_cast<PointerType>(Obj->getType()))
527 if (Ty->getAddressSpace() > 255)
528 // Fast instruction selection doesn't support the special
535 case Instruction::BitCast: {
536 // Look through bitcasts.
537 return computeAddress(U->getOperand(0), Addr, Ty);
539 case Instruction::IntToPtr: {
540 // Look past no-op inttoptrs.
541 if (TLI.getValueType(DL, U->getOperand(0)->getType()) ==
542 TLI.getPointerTy(DL))
543 return computeAddress(U->getOperand(0), Addr, Ty);
546 case Instruction::PtrToInt: {
547 // Look past no-op ptrtoints.
548 if (TLI.getValueType(DL, U->getType()) == TLI.getPointerTy(DL))
549 return computeAddress(U->getOperand(0), Addr, Ty);
552 case Instruction::GetElementPtr: {
553 Address SavedAddr = Addr;
554 uint64_t TmpOffset = Addr.getOffset();
556 // Iterate through the GEP folding the constants into offsets where
558 gep_type_iterator GTI = gep_type_begin(U);
559 for (User::const_op_iterator i = U->op_begin() + 1, e = U->op_end(); i != e;
561 const Value *Op = *i;
562 if (StructType *STy = dyn_cast<StructType>(*GTI)) {
563 const StructLayout *SL = DL.getStructLayout(STy);
564 unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
565 TmpOffset += SL->getElementOffset(Idx);
567 uint64_t S = DL.getTypeAllocSize(GTI.getIndexedType());
569 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
570 // Constant-offset addressing.
571 TmpOffset += CI->getSExtValue() * S;
574 if (canFoldAddIntoGEP(U, Op)) {
575 // A compatible add with a constant operand. Fold the constant.
577 cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
578 TmpOffset += CI->getSExtValue() * S;
579 // Iterate on the other operand.
580 Op = cast<AddOperator>(Op)->getOperand(0);
584 goto unsupported_gep;
589 // Try to grab the base operand now.
590 Addr.setOffset(TmpOffset);
591 if (computeAddress(U->getOperand(0), Addr, Ty))
594 // We failed, restore everything and try the other options.
600 case Instruction::Alloca: {
601 const AllocaInst *AI = cast<AllocaInst>(Obj);
602 DenseMap<const AllocaInst *, int>::iterator SI =
603 FuncInfo.StaticAllocaMap.find(AI);
604 if (SI != FuncInfo.StaticAllocaMap.end()) {
605 Addr.setKind(Address::FrameIndexBase);
606 Addr.setFI(SI->second);
611 case Instruction::Add: {
612 // Adds of constants are common and easy enough.
613 const Value *LHS = U->getOperand(0);
614 const Value *RHS = U->getOperand(1);
616 if (isa<ConstantInt>(LHS))
619 if (const ConstantInt *CI = dyn_cast<ConstantInt>(RHS)) {
620 Addr.setOffset(Addr.getOffset() + CI->getSExtValue());
621 return computeAddress(LHS, Addr, Ty);
624 Address Backup = Addr;
625 if (computeAddress(LHS, Addr, Ty) && computeAddress(RHS, Addr, Ty))
631 case Instruction::Sub: {
632 // Subs of constants are common and easy enough.
633 const Value *LHS = U->getOperand(0);
634 const Value *RHS = U->getOperand(1);
636 if (const ConstantInt *CI = dyn_cast<ConstantInt>(RHS)) {
637 Addr.setOffset(Addr.getOffset() - CI->getSExtValue());
638 return computeAddress(LHS, Addr, Ty);
642 case Instruction::Shl: {
643 if (Addr.getOffsetReg())
646 const auto *CI = dyn_cast<ConstantInt>(U->getOperand(1));
650 unsigned Val = CI->getZExtValue();
651 if (Val < 1 || Val > 3)
654 uint64_t NumBytes = 0;
655 if (Ty && Ty->isSized()) {
656 uint64_t NumBits = DL.getTypeSizeInBits(Ty);
657 NumBytes = NumBits / 8;
658 if (!isPowerOf2_64(NumBits))
662 if (NumBytes != (1ULL << Val))
666 Addr.setExtendType(AArch64_AM::LSL);
668 const Value *Src = U->getOperand(0);
669 if (const auto *I = dyn_cast<Instruction>(Src)) {
670 if (FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
671 // Fold the zext or sext when it won't become a noop.
672 if (const auto *ZE = dyn_cast<ZExtInst>(I)) {
673 if (!isIntExtFree(ZE) &&
674 ZE->getOperand(0)->getType()->isIntegerTy(32)) {
675 Addr.setExtendType(AArch64_AM::UXTW);
676 Src = ZE->getOperand(0);
678 } else if (const auto *SE = dyn_cast<SExtInst>(I)) {
679 if (!isIntExtFree(SE) &&
680 SE->getOperand(0)->getType()->isIntegerTy(32)) {
681 Addr.setExtendType(AArch64_AM::SXTW);
682 Src = SE->getOperand(0);
688 if (const auto *AI = dyn_cast<BinaryOperator>(Src))
689 if (AI->getOpcode() == Instruction::And) {
690 const Value *LHS = AI->getOperand(0);
691 const Value *RHS = AI->getOperand(1);
693 if (const auto *C = dyn_cast<ConstantInt>(LHS))
694 if (C->getValue() == 0xffffffff)
697 if (const auto *C = dyn_cast<ConstantInt>(RHS))
698 if (C->getValue() == 0xffffffff) {
699 Addr.setExtendType(AArch64_AM::UXTW);
700 unsigned Reg = getRegForValue(LHS);
703 bool RegIsKill = hasTrivialKill(LHS);
704 Reg = fastEmitInst_extractsubreg(MVT::i32, Reg, RegIsKill,
706 Addr.setOffsetReg(Reg);
711 unsigned Reg = getRegForValue(Src);
714 Addr.setOffsetReg(Reg);
717 case Instruction::Mul: {
718 if (Addr.getOffsetReg())
724 const Value *LHS = U->getOperand(0);
725 const Value *RHS = U->getOperand(1);
727 // Canonicalize power-of-2 value to the RHS.
728 if (const auto *C = dyn_cast<ConstantInt>(LHS))
729 if (C->getValue().isPowerOf2())
732 assert(isa<ConstantInt>(RHS) && "Expected an ConstantInt.");
733 const auto *C = cast<ConstantInt>(RHS);
734 unsigned Val = C->getValue().logBase2();
735 if (Val < 1 || Val > 3)
738 uint64_t NumBytes = 0;
739 if (Ty && Ty->isSized()) {
740 uint64_t NumBits = DL.getTypeSizeInBits(Ty);
741 NumBytes = NumBits / 8;
742 if (!isPowerOf2_64(NumBits))
746 if (NumBytes != (1ULL << Val))
750 Addr.setExtendType(AArch64_AM::LSL);
752 const Value *Src = LHS;
753 if (const auto *I = dyn_cast<Instruction>(Src)) {
754 if (FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
755 // Fold the zext or sext when it won't become a noop.
756 if (const auto *ZE = dyn_cast<ZExtInst>(I)) {
757 if (!isIntExtFree(ZE) &&
758 ZE->getOperand(0)->getType()->isIntegerTy(32)) {
759 Addr.setExtendType(AArch64_AM::UXTW);
760 Src = ZE->getOperand(0);
762 } else if (const auto *SE = dyn_cast<SExtInst>(I)) {
763 if (!isIntExtFree(SE) &&
764 SE->getOperand(0)->getType()->isIntegerTy(32)) {
765 Addr.setExtendType(AArch64_AM::SXTW);
766 Src = SE->getOperand(0);
772 unsigned Reg = getRegForValue(Src);
775 Addr.setOffsetReg(Reg);
778 case Instruction::And: {
779 if (Addr.getOffsetReg())
782 if (!Ty || DL.getTypeSizeInBits(Ty) != 8)
785 const Value *LHS = U->getOperand(0);
786 const Value *RHS = U->getOperand(1);
788 if (const auto *C = dyn_cast<ConstantInt>(LHS))
789 if (C->getValue() == 0xffffffff)
792 if (const auto *C = dyn_cast<ConstantInt>(RHS))
793 if (C->getValue() == 0xffffffff) {
795 Addr.setExtendType(AArch64_AM::LSL);
796 Addr.setExtendType(AArch64_AM::UXTW);
798 unsigned Reg = getRegForValue(LHS);
801 bool RegIsKill = hasTrivialKill(LHS);
802 Reg = fastEmitInst_extractsubreg(MVT::i32, Reg, RegIsKill,
804 Addr.setOffsetReg(Reg);
809 case Instruction::SExt:
810 case Instruction::ZExt: {
811 if (!Addr.getReg() || Addr.getOffsetReg())
814 const Value *Src = nullptr;
815 // Fold the zext or sext when it won't become a noop.
816 if (const auto *ZE = dyn_cast<ZExtInst>(U)) {
817 if (!isIntExtFree(ZE) && ZE->getOperand(0)->getType()->isIntegerTy(32)) {
818 Addr.setExtendType(AArch64_AM::UXTW);
819 Src = ZE->getOperand(0);
821 } else if (const auto *SE = dyn_cast<SExtInst>(U)) {
822 if (!isIntExtFree(SE) && SE->getOperand(0)->getType()->isIntegerTy(32)) {
823 Addr.setExtendType(AArch64_AM::SXTW);
824 Src = SE->getOperand(0);
832 unsigned Reg = getRegForValue(Src);
835 Addr.setOffsetReg(Reg);
840 if (Addr.isRegBase() && !Addr.getReg()) {
841 unsigned Reg = getRegForValue(Obj);
848 if (!Addr.getOffsetReg()) {
849 unsigned Reg = getRegForValue(Obj);
852 Addr.setOffsetReg(Reg);
859 bool AArch64FastISel::computeCallAddress(const Value *V, Address &Addr) {
860 const User *U = nullptr;
861 unsigned Opcode = Instruction::UserOp1;
864 if (const auto *I = dyn_cast<Instruction>(V)) {
865 Opcode = I->getOpcode();
867 InMBB = I->getParent() == FuncInfo.MBB->getBasicBlock();
868 } else if (const auto *C = dyn_cast<ConstantExpr>(V)) {
869 Opcode = C->getOpcode();
875 case Instruction::BitCast:
876 // Look past bitcasts if its operand is in the same BB.
878 return computeCallAddress(U->getOperand(0), Addr);
880 case Instruction::IntToPtr:
881 // Look past no-op inttoptrs if its operand is in the same BB.
883 TLI.getValueType(DL, U->getOperand(0)->getType()) ==
884 TLI.getPointerTy(DL))
885 return computeCallAddress(U->getOperand(0), Addr);
887 case Instruction::PtrToInt:
888 // Look past no-op ptrtoints if its operand is in the same BB.
889 if (InMBB && TLI.getValueType(DL, U->getType()) == TLI.getPointerTy(DL))
890 return computeCallAddress(U->getOperand(0), Addr);
894 if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
895 Addr.setGlobalValue(GV);
899 // If all else fails, try to materialize the value in a register.
900 if (!Addr.getGlobalValue()) {
901 Addr.setReg(getRegForValue(V));
902 return Addr.getReg() != 0;
909 bool AArch64FastISel::isTypeLegal(Type *Ty, MVT &VT) {
910 EVT evt = TLI.getValueType(DL, Ty, true);
912 // Only handle simple types.
913 if (evt == MVT::Other || !evt.isSimple())
915 VT = evt.getSimpleVT();
917 // This is a legal type, but it's not something we handle in fast-isel.
921 // Handle all other legal types, i.e. a register that will directly hold this
923 return TLI.isTypeLegal(VT);
926 /// \brief Determine if the value type is supported by FastISel.
928 /// FastISel for AArch64 can handle more value types than are legal. This adds
929 /// simple value type such as i1, i8, and i16.
930 bool AArch64FastISel::isTypeSupported(Type *Ty, MVT &VT, bool IsVectorAllowed) {
931 if (Ty->isVectorTy() && !IsVectorAllowed)
934 if (isTypeLegal(Ty, VT))
937 // If this is a type than can be sign or zero-extended to a basic operation
938 // go ahead and accept it now.
939 if (VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16)
945 bool AArch64FastISel::isValueAvailable(const Value *V) const {
946 if (!isa<Instruction>(V))
949 const auto *I = cast<Instruction>(V);
950 if (FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB)
956 bool AArch64FastISel::simplifyAddress(Address &Addr, MVT VT) {
957 unsigned ScaleFactor = getImplicitScaleFactor(VT);
961 bool ImmediateOffsetNeedsLowering = false;
962 bool RegisterOffsetNeedsLowering = false;
963 int64_t Offset = Addr.getOffset();
964 if (((Offset < 0) || (Offset & (ScaleFactor - 1))) && !isInt<9>(Offset))
965 ImmediateOffsetNeedsLowering = true;
966 else if (Offset > 0 && !(Offset & (ScaleFactor - 1)) &&
967 !isUInt<12>(Offset / ScaleFactor))
968 ImmediateOffsetNeedsLowering = true;
970 // Cannot encode an offset register and an immediate offset in the same
971 // instruction. Fold the immediate offset into the load/store instruction and
972 // emit an additional add to take care of the offset register.
973 if (!ImmediateOffsetNeedsLowering && Addr.getOffset() && Addr.getOffsetReg())
974 RegisterOffsetNeedsLowering = true;
976 // Cannot encode zero register as base.
977 if (Addr.isRegBase() && Addr.getOffsetReg() && !Addr.getReg())
978 RegisterOffsetNeedsLowering = true;
980 // If this is a stack pointer and the offset needs to be simplified then put
981 // the alloca address into a register, set the base type back to register and
982 // continue. This should almost never happen.
983 if ((ImmediateOffsetNeedsLowering || Addr.getOffsetReg()) && Addr.isFIBase())
985 unsigned ResultReg = createResultReg(&AArch64::GPR64spRegClass);
986 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADDXri),
988 .addFrameIndex(Addr.getFI())
991 Addr.setKind(Address::RegBase);
992 Addr.setReg(ResultReg);
995 if (RegisterOffsetNeedsLowering) {
996 unsigned ResultReg = 0;
998 if (Addr.getExtendType() == AArch64_AM::SXTW ||
999 Addr.getExtendType() == AArch64_AM::UXTW )
1000 ResultReg = emitAddSub_rx(/*UseAdd=*/true, MVT::i64, Addr.getReg(),
1001 /*TODO:IsKill=*/false, Addr.getOffsetReg(),
1002 /*TODO:IsKill=*/false, Addr.getExtendType(),
1005 ResultReg = emitAddSub_rs(/*UseAdd=*/true, MVT::i64, Addr.getReg(),
1006 /*TODO:IsKill=*/false, Addr.getOffsetReg(),
1007 /*TODO:IsKill=*/false, AArch64_AM::LSL,
1010 if (Addr.getExtendType() == AArch64_AM::UXTW)
1011 ResultReg = emitLSL_ri(MVT::i64, MVT::i32, Addr.getOffsetReg(),
1012 /*Op0IsKill=*/false, Addr.getShift(),
1014 else if (Addr.getExtendType() == AArch64_AM::SXTW)
1015 ResultReg = emitLSL_ri(MVT::i64, MVT::i32, Addr.getOffsetReg(),
1016 /*Op0IsKill=*/false, Addr.getShift(),
1019 ResultReg = emitLSL_ri(MVT::i64, MVT::i64, Addr.getOffsetReg(),
1020 /*Op0IsKill=*/false, Addr.getShift());
1025 Addr.setReg(ResultReg);
1026 Addr.setOffsetReg(0);
1028 Addr.setExtendType(AArch64_AM::InvalidShiftExtend);
1031 // Since the offset is too large for the load/store instruction get the
1032 // reg+offset into a register.
1033 if (ImmediateOffsetNeedsLowering) {
1036 // Try to fold the immediate into the add instruction.
1037 ResultReg = emitAdd_ri_(MVT::i64, Addr.getReg(), /*IsKill=*/false, Offset);
1039 ResultReg = fastEmit_i(MVT::i64, MVT::i64, ISD::Constant, Offset);
1043 Addr.setReg(ResultReg);
1049 void AArch64FastISel::addLoadStoreOperands(Address &Addr,
1050 const MachineInstrBuilder &MIB,
1052 unsigned ScaleFactor,
1053 MachineMemOperand *MMO) {
1054 int64_t Offset = Addr.getOffset() / ScaleFactor;
1055 // Frame base works a bit differently. Handle it separately.
1056 if (Addr.isFIBase()) {
1057 int FI = Addr.getFI();
1058 // FIXME: We shouldn't be using getObjectSize/getObjectAlignment. The size
1059 // and alignment should be based on the VT.
1060 MMO = FuncInfo.MF->getMachineMemOperand(
1061 MachinePointerInfo::getFixedStack(*FuncInfo.MF, FI, Offset), Flags,
1062 MFI.getObjectSize(FI), MFI.getObjectAlignment(FI));
1063 // Now add the rest of the operands.
1064 MIB.addFrameIndex(FI).addImm(Offset);
1066 assert(Addr.isRegBase() && "Unexpected address kind.");
1067 const MCInstrDesc &II = MIB->getDesc();
1068 unsigned Idx = (Flags & MachineMemOperand::MOStore) ? 1 : 0;
1070 constrainOperandRegClass(II, Addr.getReg(), II.getNumDefs()+Idx));
1072 constrainOperandRegClass(II, Addr.getOffsetReg(), II.getNumDefs()+Idx+1));
1073 if (Addr.getOffsetReg()) {
1074 assert(Addr.getOffset() == 0 && "Unexpected offset");
1075 bool IsSigned = Addr.getExtendType() == AArch64_AM::SXTW ||
1076 Addr.getExtendType() == AArch64_AM::SXTX;
1077 MIB.addReg(Addr.getReg());
1078 MIB.addReg(Addr.getOffsetReg());
1079 MIB.addImm(IsSigned);
1080 MIB.addImm(Addr.getShift() != 0);
1082 MIB.addReg(Addr.getReg()).addImm(Offset);
1086 MIB.addMemOperand(MMO);
1089 unsigned AArch64FastISel::emitAddSub(bool UseAdd, MVT RetVT, const Value *LHS,
1090 const Value *RHS, bool SetFlags,
1091 bool WantResult, bool IsZExt) {
1092 AArch64_AM::ShiftExtendType ExtendType = AArch64_AM::InvalidShiftExtend;
1093 bool NeedExtend = false;
1094 switch (RetVT.SimpleTy) {
1102 ExtendType = IsZExt ? AArch64_AM::UXTB : AArch64_AM::SXTB;
1106 ExtendType = IsZExt ? AArch64_AM::UXTH : AArch64_AM::SXTH;
1108 case MVT::i32: // fall-through
1113 RetVT.SimpleTy = std::max(RetVT.SimpleTy, MVT::i32);
1115 // Canonicalize immediates to the RHS first.
1116 if (UseAdd && isa<Constant>(LHS) && !isa<Constant>(RHS))
1117 std::swap(LHS, RHS);
1119 // Canonicalize mul by power of 2 to the RHS.
1120 if (UseAdd && LHS->hasOneUse() && isValueAvailable(LHS))
1121 if (isMulPowOf2(LHS))
1122 std::swap(LHS, RHS);
1124 // Canonicalize shift immediate to the RHS.
1125 if (UseAdd && LHS->hasOneUse() && isValueAvailable(LHS))
1126 if (const auto *SI = dyn_cast<BinaryOperator>(LHS))
1127 if (isa<ConstantInt>(SI->getOperand(1)))
1128 if (SI->getOpcode() == Instruction::Shl ||
1129 SI->getOpcode() == Instruction::LShr ||
1130 SI->getOpcode() == Instruction::AShr )
1131 std::swap(LHS, RHS);
1133 unsigned LHSReg = getRegForValue(LHS);
1136 bool LHSIsKill = hasTrivialKill(LHS);
1139 LHSReg = emitIntExt(SrcVT, LHSReg, RetVT, IsZExt);
1141 unsigned ResultReg = 0;
1142 if (const auto *C = dyn_cast<ConstantInt>(RHS)) {
1143 uint64_t Imm = IsZExt ? C->getZExtValue() : C->getSExtValue();
1144 if (C->isNegative())
1145 ResultReg = emitAddSub_ri(!UseAdd, RetVT, LHSReg, LHSIsKill, -Imm,
1146 SetFlags, WantResult);
1148 ResultReg = emitAddSub_ri(UseAdd, RetVT, LHSReg, LHSIsKill, Imm, SetFlags,
1150 } else if (const auto *C = dyn_cast<Constant>(RHS))
1151 if (C->isNullValue())
1152 ResultReg = emitAddSub_ri(UseAdd, RetVT, LHSReg, LHSIsKill, 0, SetFlags,
1158 // Only extend the RHS within the instruction if there is a valid extend type.
1159 if (ExtendType != AArch64_AM::InvalidShiftExtend && RHS->hasOneUse() &&
1160 isValueAvailable(RHS)) {
1161 if (const auto *SI = dyn_cast<BinaryOperator>(RHS))
1162 if (const auto *C = dyn_cast<ConstantInt>(SI->getOperand(1)))
1163 if ((SI->getOpcode() == Instruction::Shl) && (C->getZExtValue() < 4)) {
1164 unsigned RHSReg = getRegForValue(SI->getOperand(0));
1167 bool RHSIsKill = hasTrivialKill(SI->getOperand(0));
1168 return emitAddSub_rx(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg,
1169 RHSIsKill, ExtendType, C->getZExtValue(),
1170 SetFlags, WantResult);
1172 unsigned RHSReg = getRegForValue(RHS);
1175 bool RHSIsKill = hasTrivialKill(RHS);
1176 return emitAddSub_rx(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg, RHSIsKill,
1177 ExtendType, 0, SetFlags, WantResult);
1180 // Check if the mul can be folded into the instruction.
1181 if (RHS->hasOneUse() && isValueAvailable(RHS)) {
1182 if (isMulPowOf2(RHS)) {
1183 const Value *MulLHS = cast<MulOperator>(RHS)->getOperand(0);
1184 const Value *MulRHS = cast<MulOperator>(RHS)->getOperand(1);
1186 if (const auto *C = dyn_cast<ConstantInt>(MulLHS))
1187 if (C->getValue().isPowerOf2())
1188 std::swap(MulLHS, MulRHS);
1190 assert(isa<ConstantInt>(MulRHS) && "Expected a ConstantInt.");
1191 uint64_t ShiftVal = cast<ConstantInt>(MulRHS)->getValue().logBase2();
1192 unsigned RHSReg = getRegForValue(MulLHS);
1195 bool RHSIsKill = hasTrivialKill(MulLHS);
1196 ResultReg = emitAddSub_rs(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg,
1197 RHSIsKill, AArch64_AM::LSL, ShiftVal, SetFlags,
1204 // Check if the shift can be folded into the instruction.
1205 if (RHS->hasOneUse() && isValueAvailable(RHS)) {
1206 if (const auto *SI = dyn_cast<BinaryOperator>(RHS)) {
1207 if (const auto *C = dyn_cast<ConstantInt>(SI->getOperand(1))) {
1208 AArch64_AM::ShiftExtendType ShiftType = AArch64_AM::InvalidShiftExtend;
1209 switch (SI->getOpcode()) {
1211 case Instruction::Shl: ShiftType = AArch64_AM::LSL; break;
1212 case Instruction::LShr: ShiftType = AArch64_AM::LSR; break;
1213 case Instruction::AShr: ShiftType = AArch64_AM::ASR; break;
1215 uint64_t ShiftVal = C->getZExtValue();
1216 if (ShiftType != AArch64_AM::InvalidShiftExtend) {
1217 unsigned RHSReg = getRegForValue(SI->getOperand(0));
1220 bool RHSIsKill = hasTrivialKill(SI->getOperand(0));
1221 ResultReg = emitAddSub_rs(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg,
1222 RHSIsKill, ShiftType, ShiftVal, SetFlags,
1231 unsigned RHSReg = getRegForValue(RHS);
1234 bool RHSIsKill = hasTrivialKill(RHS);
1237 RHSReg = emitIntExt(SrcVT, RHSReg, RetVT, IsZExt);
1239 return emitAddSub_rr(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg, RHSIsKill,
1240 SetFlags, WantResult);
1243 unsigned AArch64FastISel::emitAddSub_rr(bool UseAdd, MVT RetVT, unsigned LHSReg,
1244 bool LHSIsKill, unsigned RHSReg,
1245 bool RHSIsKill, bool SetFlags,
1247 assert(LHSReg && RHSReg && "Invalid register number.");
1249 if (RetVT != MVT::i32 && RetVT != MVT::i64)
1252 static const unsigned OpcTable[2][2][2] = {
1253 { { AArch64::SUBWrr, AArch64::SUBXrr },
1254 { AArch64::ADDWrr, AArch64::ADDXrr } },
1255 { { AArch64::SUBSWrr, AArch64::SUBSXrr },
1256 { AArch64::ADDSWrr, AArch64::ADDSXrr } }
1258 bool Is64Bit = RetVT == MVT::i64;
1259 unsigned Opc = OpcTable[SetFlags][UseAdd][Is64Bit];
1260 const TargetRegisterClass *RC =
1261 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
1264 ResultReg = createResultReg(RC);
1266 ResultReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
1268 const MCInstrDesc &II = TII.get(Opc);
1269 LHSReg = constrainOperandRegClass(II, LHSReg, II.getNumDefs());
1270 RHSReg = constrainOperandRegClass(II, RHSReg, II.getNumDefs() + 1);
1271 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, ResultReg)
1272 .addReg(LHSReg, getKillRegState(LHSIsKill))
1273 .addReg(RHSReg, getKillRegState(RHSIsKill));
1277 unsigned AArch64FastISel::emitAddSub_ri(bool UseAdd, MVT RetVT, unsigned LHSReg,
1278 bool LHSIsKill, uint64_t Imm,
1279 bool SetFlags, bool WantResult) {
1280 assert(LHSReg && "Invalid register number.");
1282 if (RetVT != MVT::i32 && RetVT != MVT::i64)
1286 if (isUInt<12>(Imm))
1288 else if ((Imm & 0xfff000) == Imm) {
1294 static const unsigned OpcTable[2][2][2] = {
1295 { { AArch64::SUBWri, AArch64::SUBXri },
1296 { AArch64::ADDWri, AArch64::ADDXri } },
1297 { { AArch64::SUBSWri, AArch64::SUBSXri },
1298 { AArch64::ADDSWri, AArch64::ADDSXri } }
1300 bool Is64Bit = RetVT == MVT::i64;
1301 unsigned Opc = OpcTable[SetFlags][UseAdd][Is64Bit];
1302 const TargetRegisterClass *RC;
1304 RC = Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
1306 RC = Is64Bit ? &AArch64::GPR64spRegClass : &AArch64::GPR32spRegClass;
1309 ResultReg = createResultReg(RC);
1311 ResultReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
1313 const MCInstrDesc &II = TII.get(Opc);
1314 LHSReg = constrainOperandRegClass(II, LHSReg, II.getNumDefs());
1315 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, ResultReg)
1316 .addReg(LHSReg, getKillRegState(LHSIsKill))
1318 .addImm(getShifterImm(AArch64_AM::LSL, ShiftImm));
1322 unsigned AArch64FastISel::emitAddSub_rs(bool UseAdd, MVT RetVT, unsigned LHSReg,
1323 bool LHSIsKill, unsigned RHSReg,
1325 AArch64_AM::ShiftExtendType ShiftType,
1326 uint64_t ShiftImm, bool SetFlags,
1328 assert(LHSReg && RHSReg && "Invalid register number.");
1330 if (RetVT != MVT::i32 && RetVT != MVT::i64)
1333 // Don't deal with undefined shifts.
1334 if (ShiftImm >= RetVT.getSizeInBits())
1337 static const unsigned OpcTable[2][2][2] = {
1338 { { AArch64::SUBWrs, AArch64::SUBXrs },
1339 { AArch64::ADDWrs, AArch64::ADDXrs } },
1340 { { AArch64::SUBSWrs, AArch64::SUBSXrs },
1341 { AArch64::ADDSWrs, AArch64::ADDSXrs } }
1343 bool Is64Bit = RetVT == MVT::i64;
1344 unsigned Opc = OpcTable[SetFlags][UseAdd][Is64Bit];
1345 const TargetRegisterClass *RC =
1346 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
1349 ResultReg = createResultReg(RC);
1351 ResultReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
1353 const MCInstrDesc &II = TII.get(Opc);
1354 LHSReg = constrainOperandRegClass(II, LHSReg, II.getNumDefs());
1355 RHSReg = constrainOperandRegClass(II, RHSReg, II.getNumDefs() + 1);
1356 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, ResultReg)
1357 .addReg(LHSReg, getKillRegState(LHSIsKill))
1358 .addReg(RHSReg, getKillRegState(RHSIsKill))
1359 .addImm(getShifterImm(ShiftType, ShiftImm));
1363 unsigned AArch64FastISel::emitAddSub_rx(bool UseAdd, MVT RetVT, unsigned LHSReg,
1364 bool LHSIsKill, unsigned RHSReg,
1366 AArch64_AM::ShiftExtendType ExtType,
1367 uint64_t ShiftImm, bool SetFlags,
1369 assert(LHSReg && RHSReg && "Invalid register number.");
1371 if (RetVT != MVT::i32 && RetVT != MVT::i64)
1377 static const unsigned OpcTable[2][2][2] = {
1378 { { AArch64::SUBWrx, AArch64::SUBXrx },
1379 { AArch64::ADDWrx, AArch64::ADDXrx } },
1380 { { AArch64::SUBSWrx, AArch64::SUBSXrx },
1381 { AArch64::ADDSWrx, AArch64::ADDSXrx } }
1383 bool Is64Bit = RetVT == MVT::i64;
1384 unsigned Opc = OpcTable[SetFlags][UseAdd][Is64Bit];
1385 const TargetRegisterClass *RC = nullptr;
1387 RC = Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
1389 RC = Is64Bit ? &AArch64::GPR64spRegClass : &AArch64::GPR32spRegClass;
1392 ResultReg = createResultReg(RC);
1394 ResultReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
1396 const MCInstrDesc &II = TII.get(Opc);
1397 LHSReg = constrainOperandRegClass(II, LHSReg, II.getNumDefs());
1398 RHSReg = constrainOperandRegClass(II, RHSReg, II.getNumDefs() + 1);
1399 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, ResultReg)
1400 .addReg(LHSReg, getKillRegState(LHSIsKill))
1401 .addReg(RHSReg, getKillRegState(RHSIsKill))
1402 .addImm(getArithExtendImm(ExtType, ShiftImm));
1406 bool AArch64FastISel::emitCmp(const Value *LHS, const Value *RHS, bool IsZExt) {
1407 Type *Ty = LHS->getType();
1408 EVT EVT = TLI.getValueType(DL, Ty, true);
1409 if (!EVT.isSimple())
1411 MVT VT = EVT.getSimpleVT();
1413 switch (VT.SimpleTy) {
1421 return emitICmp(VT, LHS, RHS, IsZExt);
1424 return emitFCmp(VT, LHS, RHS);
1428 bool AArch64FastISel::emitICmp(MVT RetVT, const Value *LHS, const Value *RHS,
1430 return emitSub(RetVT, LHS, RHS, /*SetFlags=*/true, /*WantResult=*/false,
1434 bool AArch64FastISel::emitICmp_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
1436 return emitAddSub_ri(/*UseAdd=*/false, RetVT, LHSReg, LHSIsKill, Imm,
1437 /*SetFlags=*/true, /*WantResult=*/false) != 0;
1440 bool AArch64FastISel::emitFCmp(MVT RetVT, const Value *LHS, const Value *RHS) {
1441 if (RetVT != MVT::f32 && RetVT != MVT::f64)
1444 // Check to see if the 2nd operand is a constant that we can encode directly
1446 bool UseImm = false;
1447 if (const auto *CFP = dyn_cast<ConstantFP>(RHS))
1448 if (CFP->isZero() && !CFP->isNegative())
1451 unsigned LHSReg = getRegForValue(LHS);
1454 bool LHSIsKill = hasTrivialKill(LHS);
1457 unsigned Opc = (RetVT == MVT::f64) ? AArch64::FCMPDri : AArch64::FCMPSri;
1458 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
1459 .addReg(LHSReg, getKillRegState(LHSIsKill));
1463 unsigned RHSReg = getRegForValue(RHS);
1466 bool RHSIsKill = hasTrivialKill(RHS);
1468 unsigned Opc = (RetVT == MVT::f64) ? AArch64::FCMPDrr : AArch64::FCMPSrr;
1469 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
1470 .addReg(LHSReg, getKillRegState(LHSIsKill))
1471 .addReg(RHSReg, getKillRegState(RHSIsKill));
1475 unsigned AArch64FastISel::emitAdd(MVT RetVT, const Value *LHS, const Value *RHS,
1476 bool SetFlags, bool WantResult, bool IsZExt) {
1477 return emitAddSub(/*UseAdd=*/true, RetVT, LHS, RHS, SetFlags, WantResult,
1481 /// \brief This method is a wrapper to simplify add emission.
1483 /// First try to emit an add with an immediate operand using emitAddSub_ri. If
1484 /// that fails, then try to materialize the immediate into a register and use
1485 /// emitAddSub_rr instead.
1486 unsigned AArch64FastISel::emitAdd_ri_(MVT VT, unsigned Op0, bool Op0IsKill,
1490 ResultReg = emitAddSub_ri(false, VT, Op0, Op0IsKill, -Imm);
1492 ResultReg = emitAddSub_ri(true, VT, Op0, Op0IsKill, Imm);
1497 unsigned CReg = fastEmit_i(VT, VT, ISD::Constant, Imm);
1501 ResultReg = emitAddSub_rr(true, VT, Op0, Op0IsKill, CReg, true);
1505 unsigned AArch64FastISel::emitSub(MVT RetVT, const Value *LHS, const Value *RHS,
1506 bool SetFlags, bool WantResult, bool IsZExt) {
1507 return emitAddSub(/*UseAdd=*/false, RetVT, LHS, RHS, SetFlags, WantResult,
1511 unsigned AArch64FastISel::emitSubs_rr(MVT RetVT, unsigned LHSReg,
1512 bool LHSIsKill, unsigned RHSReg,
1513 bool RHSIsKill, bool WantResult) {
1514 return emitAddSub_rr(/*UseAdd=*/false, RetVT, LHSReg, LHSIsKill, RHSReg,
1515 RHSIsKill, /*SetFlags=*/true, WantResult);
1518 unsigned AArch64FastISel::emitSubs_rs(MVT RetVT, unsigned LHSReg,
1519 bool LHSIsKill, unsigned RHSReg,
1521 AArch64_AM::ShiftExtendType ShiftType,
1522 uint64_t ShiftImm, bool WantResult) {
1523 return emitAddSub_rs(/*UseAdd=*/false, RetVT, LHSReg, LHSIsKill, RHSReg,
1524 RHSIsKill, ShiftType, ShiftImm, /*SetFlags=*/true,
1528 unsigned AArch64FastISel::emitLogicalOp(unsigned ISDOpc, MVT RetVT,
1529 const Value *LHS, const Value *RHS) {
1530 // Canonicalize immediates to the RHS first.
1531 if (isa<ConstantInt>(LHS) && !isa<ConstantInt>(RHS))
1532 std::swap(LHS, RHS);
1534 // Canonicalize mul by power-of-2 to the RHS.
1535 if (LHS->hasOneUse() && isValueAvailable(LHS))
1536 if (isMulPowOf2(LHS))
1537 std::swap(LHS, RHS);
1539 // Canonicalize shift immediate to the RHS.
1540 if (LHS->hasOneUse() && isValueAvailable(LHS))
1541 if (const auto *SI = dyn_cast<ShlOperator>(LHS))
1542 if (isa<ConstantInt>(SI->getOperand(1)))
1543 std::swap(LHS, RHS);
1545 unsigned LHSReg = getRegForValue(LHS);
1548 bool LHSIsKill = hasTrivialKill(LHS);
1550 unsigned ResultReg = 0;
1551 if (const auto *C = dyn_cast<ConstantInt>(RHS)) {
1552 uint64_t Imm = C->getZExtValue();
1553 ResultReg = emitLogicalOp_ri(ISDOpc, RetVT, LHSReg, LHSIsKill, Imm);
1558 // Check if the mul can be folded into the instruction.
1559 if (RHS->hasOneUse() && isValueAvailable(RHS)) {
1560 if (isMulPowOf2(RHS)) {
1561 const Value *MulLHS = cast<MulOperator>(RHS)->getOperand(0);
1562 const Value *MulRHS = cast<MulOperator>(RHS)->getOperand(1);
1564 if (const auto *C = dyn_cast<ConstantInt>(MulLHS))
1565 if (C->getValue().isPowerOf2())
1566 std::swap(MulLHS, MulRHS);
1568 assert(isa<ConstantInt>(MulRHS) && "Expected a ConstantInt.");
1569 uint64_t ShiftVal = cast<ConstantInt>(MulRHS)->getValue().logBase2();
1571 unsigned RHSReg = getRegForValue(MulLHS);
1574 bool RHSIsKill = hasTrivialKill(MulLHS);
1575 ResultReg = emitLogicalOp_rs(ISDOpc, RetVT, LHSReg, LHSIsKill, RHSReg,
1576 RHSIsKill, ShiftVal);
1582 // Check if the shift can be folded into the instruction.
1583 if (RHS->hasOneUse() && isValueAvailable(RHS)) {
1584 if (const auto *SI = dyn_cast<ShlOperator>(RHS))
1585 if (const auto *C = dyn_cast<ConstantInt>(SI->getOperand(1))) {
1586 uint64_t ShiftVal = C->getZExtValue();
1587 unsigned RHSReg = getRegForValue(SI->getOperand(0));
1590 bool RHSIsKill = hasTrivialKill(SI->getOperand(0));
1591 ResultReg = emitLogicalOp_rs(ISDOpc, RetVT, LHSReg, LHSIsKill, RHSReg,
1592 RHSIsKill, ShiftVal);
1598 unsigned RHSReg = getRegForValue(RHS);
1601 bool RHSIsKill = hasTrivialKill(RHS);
1603 MVT VT = std::max(MVT::i32, RetVT.SimpleTy);
1604 ResultReg = fastEmit_rr(VT, VT, ISDOpc, LHSReg, LHSIsKill, RHSReg, RHSIsKill);
1605 if (RetVT >= MVT::i8 && RetVT <= MVT::i16) {
1606 uint64_t Mask = (RetVT == MVT::i8) ? 0xff : 0xffff;
1607 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
1612 unsigned AArch64FastISel::emitLogicalOp_ri(unsigned ISDOpc, MVT RetVT,
1613 unsigned LHSReg, bool LHSIsKill,
1615 assert((ISD::AND + 1 == ISD::OR) && (ISD::AND + 2 == ISD::XOR) &&
1616 "ISD nodes are not consecutive!");
1617 static const unsigned OpcTable[3][2] = {
1618 { AArch64::ANDWri, AArch64::ANDXri },
1619 { AArch64::ORRWri, AArch64::ORRXri },
1620 { AArch64::EORWri, AArch64::EORXri }
1622 const TargetRegisterClass *RC;
1625 switch (RetVT.SimpleTy) {
1632 unsigned Idx = ISDOpc - ISD::AND;
1633 Opc = OpcTable[Idx][0];
1634 RC = &AArch64::GPR32spRegClass;
1639 Opc = OpcTable[ISDOpc - ISD::AND][1];
1640 RC = &AArch64::GPR64spRegClass;
1645 if (!AArch64_AM::isLogicalImmediate(Imm, RegSize))
1648 unsigned ResultReg =
1649 fastEmitInst_ri(Opc, RC, LHSReg, LHSIsKill,
1650 AArch64_AM::encodeLogicalImmediate(Imm, RegSize));
1651 if (RetVT >= MVT::i8 && RetVT <= MVT::i16 && ISDOpc != ISD::AND) {
1652 uint64_t Mask = (RetVT == MVT::i8) ? 0xff : 0xffff;
1653 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
1658 unsigned AArch64FastISel::emitLogicalOp_rs(unsigned ISDOpc, MVT RetVT,
1659 unsigned LHSReg, bool LHSIsKill,
1660 unsigned RHSReg, bool RHSIsKill,
1661 uint64_t ShiftImm) {
1662 assert((ISD::AND + 1 == ISD::OR) && (ISD::AND + 2 == ISD::XOR) &&
1663 "ISD nodes are not consecutive!");
1664 static const unsigned OpcTable[3][2] = {
1665 { AArch64::ANDWrs, AArch64::ANDXrs },
1666 { AArch64::ORRWrs, AArch64::ORRXrs },
1667 { AArch64::EORWrs, AArch64::EORXrs }
1670 // Don't deal with undefined shifts.
1671 if (ShiftImm >= RetVT.getSizeInBits())
1674 const TargetRegisterClass *RC;
1676 switch (RetVT.SimpleTy) {
1683 Opc = OpcTable[ISDOpc - ISD::AND][0];
1684 RC = &AArch64::GPR32RegClass;
1687 Opc = OpcTable[ISDOpc - ISD::AND][1];
1688 RC = &AArch64::GPR64RegClass;
1691 unsigned ResultReg =
1692 fastEmitInst_rri(Opc, RC, LHSReg, LHSIsKill, RHSReg, RHSIsKill,
1693 AArch64_AM::getShifterImm(AArch64_AM::LSL, ShiftImm));
1694 if (RetVT >= MVT::i8 && RetVT <= MVT::i16) {
1695 uint64_t Mask = (RetVT == MVT::i8) ? 0xff : 0xffff;
1696 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
1701 unsigned AArch64FastISel::emitAnd_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
1703 return emitLogicalOp_ri(ISD::AND, RetVT, LHSReg, LHSIsKill, Imm);
1706 unsigned AArch64FastISel::emitLoad(MVT VT, MVT RetVT, Address Addr,
1707 bool WantZExt, MachineMemOperand *MMO) {
1708 if (!TLI.allowsMisalignedMemoryAccesses(VT))
1711 // Simplify this down to something we can handle.
1712 if (!simplifyAddress(Addr, VT))
1715 unsigned ScaleFactor = getImplicitScaleFactor(VT);
1717 llvm_unreachable("Unexpected value type.");
1719 // Negative offsets require unscaled, 9-bit, signed immediate offsets.
1720 // Otherwise, we try using scaled, 12-bit, unsigned immediate offsets.
1721 bool UseScaled = true;
1722 if ((Addr.getOffset() < 0) || (Addr.getOffset() & (ScaleFactor - 1))) {
1727 static const unsigned GPOpcTable[2][8][4] = {
1729 { { AArch64::LDURSBWi, AArch64::LDURSHWi, AArch64::LDURWi,
1731 { AArch64::LDURSBXi, AArch64::LDURSHXi, AArch64::LDURSWi,
1733 { AArch64::LDRSBWui, AArch64::LDRSHWui, AArch64::LDRWui,
1735 { AArch64::LDRSBXui, AArch64::LDRSHXui, AArch64::LDRSWui,
1737 { AArch64::LDRSBWroX, AArch64::LDRSHWroX, AArch64::LDRWroX,
1739 { AArch64::LDRSBXroX, AArch64::LDRSHXroX, AArch64::LDRSWroX,
1741 { AArch64::LDRSBWroW, AArch64::LDRSHWroW, AArch64::LDRWroW,
1743 { AArch64::LDRSBXroW, AArch64::LDRSHXroW, AArch64::LDRSWroW,
1747 { { AArch64::LDURBBi, AArch64::LDURHHi, AArch64::LDURWi,
1749 { AArch64::LDURBBi, AArch64::LDURHHi, AArch64::LDURWi,
1751 { AArch64::LDRBBui, AArch64::LDRHHui, AArch64::LDRWui,
1753 { AArch64::LDRBBui, AArch64::LDRHHui, AArch64::LDRWui,
1755 { AArch64::LDRBBroX, AArch64::LDRHHroX, AArch64::LDRWroX,
1757 { AArch64::LDRBBroX, AArch64::LDRHHroX, AArch64::LDRWroX,
1759 { AArch64::LDRBBroW, AArch64::LDRHHroW, AArch64::LDRWroW,
1761 { AArch64::LDRBBroW, AArch64::LDRHHroW, AArch64::LDRWroW,
1766 static const unsigned FPOpcTable[4][2] = {
1767 { AArch64::LDURSi, AArch64::LDURDi },
1768 { AArch64::LDRSui, AArch64::LDRDui },
1769 { AArch64::LDRSroX, AArch64::LDRDroX },
1770 { AArch64::LDRSroW, AArch64::LDRDroW }
1774 const TargetRegisterClass *RC;
1775 bool UseRegOffset = Addr.isRegBase() && !Addr.getOffset() && Addr.getReg() &&
1776 Addr.getOffsetReg();
1777 unsigned Idx = UseRegOffset ? 2 : UseScaled ? 1 : 0;
1778 if (Addr.getExtendType() == AArch64_AM::UXTW ||
1779 Addr.getExtendType() == AArch64_AM::SXTW)
1782 bool IsRet64Bit = RetVT == MVT::i64;
1783 switch (VT.SimpleTy) {
1785 llvm_unreachable("Unexpected value type.");
1786 case MVT::i1: // Intentional fall-through.
1788 Opc = GPOpcTable[WantZExt][2 * Idx + IsRet64Bit][0];
1789 RC = (IsRet64Bit && !WantZExt) ?
1790 &AArch64::GPR64RegClass: &AArch64::GPR32RegClass;
1793 Opc = GPOpcTable[WantZExt][2 * Idx + IsRet64Bit][1];
1794 RC = (IsRet64Bit && !WantZExt) ?
1795 &AArch64::GPR64RegClass: &AArch64::GPR32RegClass;
1798 Opc = GPOpcTable[WantZExt][2 * Idx + IsRet64Bit][2];
1799 RC = (IsRet64Bit && !WantZExt) ?
1800 &AArch64::GPR64RegClass: &AArch64::GPR32RegClass;
1803 Opc = GPOpcTable[WantZExt][2 * Idx + IsRet64Bit][3];
1804 RC = &AArch64::GPR64RegClass;
1807 Opc = FPOpcTable[Idx][0];
1808 RC = &AArch64::FPR32RegClass;
1811 Opc = FPOpcTable[Idx][1];
1812 RC = &AArch64::FPR64RegClass;
1816 // Create the base instruction, then add the operands.
1817 unsigned ResultReg = createResultReg(RC);
1818 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1819 TII.get(Opc), ResultReg);
1820 addLoadStoreOperands(Addr, MIB, MachineMemOperand::MOLoad, ScaleFactor, MMO);
1822 // Loading an i1 requires special handling.
1823 if (VT == MVT::i1) {
1824 unsigned ANDReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, 1);
1825 assert(ANDReg && "Unexpected AND instruction emission failure.");
1829 // For zero-extending loads to 64bit we emit a 32bit load and then convert
1830 // the 32bit reg to a 64bit reg.
1831 if (WantZExt && RetVT == MVT::i64 && VT <= MVT::i32) {
1832 unsigned Reg64 = createResultReg(&AArch64::GPR64RegClass);
1833 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1834 TII.get(AArch64::SUBREG_TO_REG), Reg64)
1836 .addReg(ResultReg, getKillRegState(true))
1837 .addImm(AArch64::sub_32);
1843 bool AArch64FastISel::selectAddSub(const Instruction *I) {
1845 if (!isTypeSupported(I->getType(), VT, /*IsVectorAllowed=*/true))
1849 return selectOperator(I, I->getOpcode());
1852 switch (I->getOpcode()) {
1854 llvm_unreachable("Unexpected instruction.");
1855 case Instruction::Add:
1856 ResultReg = emitAdd(VT, I->getOperand(0), I->getOperand(1));
1858 case Instruction::Sub:
1859 ResultReg = emitSub(VT, I->getOperand(0), I->getOperand(1));
1865 updateValueMap(I, ResultReg);
1869 bool AArch64FastISel::selectLogicalOp(const Instruction *I) {
1871 if (!isTypeSupported(I->getType(), VT, /*IsVectorAllowed=*/true))
1875 return selectOperator(I, I->getOpcode());
1878 switch (I->getOpcode()) {
1880 llvm_unreachable("Unexpected instruction.");
1881 case Instruction::And:
1882 ResultReg = emitLogicalOp(ISD::AND, VT, I->getOperand(0), I->getOperand(1));
1884 case Instruction::Or:
1885 ResultReg = emitLogicalOp(ISD::OR, VT, I->getOperand(0), I->getOperand(1));
1887 case Instruction::Xor:
1888 ResultReg = emitLogicalOp(ISD::XOR, VT, I->getOperand(0), I->getOperand(1));
1894 updateValueMap(I, ResultReg);
1898 bool AArch64FastISel::selectLoad(const Instruction *I) {
1900 // Verify we have a legal type before going any further. Currently, we handle
1901 // simple types that will directly fit in a register (i32/f32/i64/f64) or
1902 // those that can be sign or zero-extended to a basic operation (i1/i8/i16).
1903 if (!isTypeSupported(I->getType(), VT, /*IsVectorAllowed=*/true) ||
1904 cast<LoadInst>(I)->isAtomic())
1907 // See if we can handle this address.
1909 if (!computeAddress(I->getOperand(0), Addr, I->getType()))
1912 // Fold the following sign-/zero-extend into the load instruction.
1913 bool WantZExt = true;
1915 const Value *IntExtVal = nullptr;
1916 if (I->hasOneUse()) {
1917 if (const auto *ZE = dyn_cast<ZExtInst>(I->use_begin()->getUser())) {
1918 if (isTypeSupported(ZE->getType(), RetVT))
1922 } else if (const auto *SE = dyn_cast<SExtInst>(I->use_begin()->getUser())) {
1923 if (isTypeSupported(SE->getType(), RetVT))
1931 unsigned ResultReg =
1932 emitLoad(VT, RetVT, Addr, WantZExt, createMachineMemOperandFor(I));
1936 // There are a few different cases we have to handle, because the load or the
1937 // sign-/zero-extend might not be selected by FastISel if we fall-back to
1938 // SelectionDAG. There is also an ordering issue when both instructions are in
1939 // different basic blocks.
1940 // 1.) The load instruction is selected by FastISel, but the integer extend
1941 // not. This usually happens when the integer extend is in a different
1942 // basic block and SelectionDAG took over for that basic block.
1943 // 2.) The load instruction is selected before the integer extend. This only
1944 // happens when the integer extend is in a different basic block.
1945 // 3.) The load instruction is selected by SelectionDAG and the integer extend
1946 // by FastISel. This happens if there are instructions between the load
1947 // and the integer extend that couldn't be selected by FastISel.
1949 // The integer extend hasn't been emitted yet. FastISel or SelectionDAG
1950 // could select it. Emit a copy to subreg if necessary. FastISel will remove
1951 // it when it selects the integer extend.
1952 unsigned Reg = lookUpRegForValue(IntExtVal);
1953 auto *MI = MRI.getUniqueVRegDef(Reg);
1955 if (RetVT == MVT::i64 && VT <= MVT::i32) {
1957 // Delete the last emitted instruction from emitLoad (SUBREG_TO_REG).
1958 std::prev(FuncInfo.InsertPt)->eraseFromParent();
1959 ResultReg = std::prev(FuncInfo.InsertPt)->getOperand(0).getReg();
1961 ResultReg = fastEmitInst_extractsubreg(MVT::i32, ResultReg,
1965 updateValueMap(I, ResultReg);
1969 // The integer extend has already been emitted - delete all the instructions
1970 // that have been emitted by the integer extend lowering code and use the
1971 // result from the load instruction directly.
1974 for (auto &Opnd : MI->uses()) {
1976 Reg = Opnd.getReg();
1980 MI->eraseFromParent();
1983 MI = MRI.getUniqueVRegDef(Reg);
1985 updateValueMap(IntExtVal, ResultReg);
1989 updateValueMap(I, ResultReg);
1993 bool AArch64FastISel::emitStore(MVT VT, unsigned SrcReg, Address Addr,
1994 MachineMemOperand *MMO) {
1995 if (!TLI.allowsMisalignedMemoryAccesses(VT))
1998 // Simplify this down to something we can handle.
1999 if (!simplifyAddress(Addr, VT))
2002 unsigned ScaleFactor = getImplicitScaleFactor(VT);
2004 llvm_unreachable("Unexpected value type.");
2006 // Negative offsets require unscaled, 9-bit, signed immediate offsets.
2007 // Otherwise, we try using scaled, 12-bit, unsigned immediate offsets.
2008 bool UseScaled = true;
2009 if ((Addr.getOffset() < 0) || (Addr.getOffset() & (ScaleFactor - 1))) {
2014 static const unsigned OpcTable[4][6] = {
2015 { AArch64::STURBBi, AArch64::STURHHi, AArch64::STURWi, AArch64::STURXi,
2016 AArch64::STURSi, AArch64::STURDi },
2017 { AArch64::STRBBui, AArch64::STRHHui, AArch64::STRWui, AArch64::STRXui,
2018 AArch64::STRSui, AArch64::STRDui },
2019 { AArch64::STRBBroX, AArch64::STRHHroX, AArch64::STRWroX, AArch64::STRXroX,
2020 AArch64::STRSroX, AArch64::STRDroX },
2021 { AArch64::STRBBroW, AArch64::STRHHroW, AArch64::STRWroW, AArch64::STRXroW,
2022 AArch64::STRSroW, AArch64::STRDroW }
2026 bool VTIsi1 = false;
2027 bool UseRegOffset = Addr.isRegBase() && !Addr.getOffset() && Addr.getReg() &&
2028 Addr.getOffsetReg();
2029 unsigned Idx = UseRegOffset ? 2 : UseScaled ? 1 : 0;
2030 if (Addr.getExtendType() == AArch64_AM::UXTW ||
2031 Addr.getExtendType() == AArch64_AM::SXTW)
2034 switch (VT.SimpleTy) {
2035 default: llvm_unreachable("Unexpected value type.");
2036 case MVT::i1: VTIsi1 = true;
2037 case MVT::i8: Opc = OpcTable[Idx][0]; break;
2038 case MVT::i16: Opc = OpcTable[Idx][1]; break;
2039 case MVT::i32: Opc = OpcTable[Idx][2]; break;
2040 case MVT::i64: Opc = OpcTable[Idx][3]; break;
2041 case MVT::f32: Opc = OpcTable[Idx][4]; break;
2042 case MVT::f64: Opc = OpcTable[Idx][5]; break;
2045 // Storing an i1 requires special handling.
2046 if (VTIsi1 && SrcReg != AArch64::WZR) {
2047 unsigned ANDReg = emitAnd_ri(MVT::i32, SrcReg, /*TODO:IsKill=*/false, 1);
2048 assert(ANDReg && "Unexpected AND instruction emission failure.");
2051 // Create the base instruction, then add the operands.
2052 const MCInstrDesc &II = TII.get(Opc);
2053 SrcReg = constrainOperandRegClass(II, SrcReg, II.getNumDefs());
2054 MachineInstrBuilder MIB =
2055 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II).addReg(SrcReg);
2056 addLoadStoreOperands(Addr, MIB, MachineMemOperand::MOStore, ScaleFactor, MMO);
2061 bool AArch64FastISel::selectStore(const Instruction *I) {
2063 const Value *Op0 = I->getOperand(0);
2064 // Verify we have a legal type before going any further. Currently, we handle
2065 // simple types that will directly fit in a register (i32/f32/i64/f64) or
2066 // those that can be sign or zero-extended to a basic operation (i1/i8/i16).
2067 if (!isTypeSupported(Op0->getType(), VT, /*IsVectorAllowed=*/true) ||
2068 cast<StoreInst>(I)->isAtomic())
2071 // Get the value to be stored into a register. Use the zero register directly
2072 // when possible to avoid an unnecessary copy and a wasted register.
2073 unsigned SrcReg = 0;
2074 if (const auto *CI = dyn_cast<ConstantInt>(Op0)) {
2076 SrcReg = (VT == MVT::i64) ? AArch64::XZR : AArch64::WZR;
2077 } else if (const auto *CF = dyn_cast<ConstantFP>(Op0)) {
2078 if (CF->isZero() && !CF->isNegative()) {
2079 VT = MVT::getIntegerVT(VT.getSizeInBits());
2080 SrcReg = (VT == MVT::i64) ? AArch64::XZR : AArch64::WZR;
2085 SrcReg = getRegForValue(Op0);
2090 // See if we can handle this address.
2092 if (!computeAddress(I->getOperand(1), Addr, I->getOperand(0)->getType()))
2095 if (!emitStore(VT, SrcReg, Addr, createMachineMemOperandFor(I)))
2100 static AArch64CC::CondCode getCompareCC(CmpInst::Predicate Pred) {
2102 case CmpInst::FCMP_ONE:
2103 case CmpInst::FCMP_UEQ:
2105 // AL is our "false" for now. The other two need more compares.
2106 return AArch64CC::AL;
2107 case CmpInst::ICMP_EQ:
2108 case CmpInst::FCMP_OEQ:
2109 return AArch64CC::EQ;
2110 case CmpInst::ICMP_SGT:
2111 case CmpInst::FCMP_OGT:
2112 return AArch64CC::GT;
2113 case CmpInst::ICMP_SGE:
2114 case CmpInst::FCMP_OGE:
2115 return AArch64CC::GE;
2116 case CmpInst::ICMP_UGT:
2117 case CmpInst::FCMP_UGT:
2118 return AArch64CC::HI;
2119 case CmpInst::FCMP_OLT:
2120 return AArch64CC::MI;
2121 case CmpInst::ICMP_ULE:
2122 case CmpInst::FCMP_OLE:
2123 return AArch64CC::LS;
2124 case CmpInst::FCMP_ORD:
2125 return AArch64CC::VC;
2126 case CmpInst::FCMP_UNO:
2127 return AArch64CC::VS;
2128 case CmpInst::FCMP_UGE:
2129 return AArch64CC::PL;
2130 case CmpInst::ICMP_SLT:
2131 case CmpInst::FCMP_ULT:
2132 return AArch64CC::LT;
2133 case CmpInst::ICMP_SLE:
2134 case CmpInst::FCMP_ULE:
2135 return AArch64CC::LE;
2136 case CmpInst::FCMP_UNE:
2137 case CmpInst::ICMP_NE:
2138 return AArch64CC::NE;
2139 case CmpInst::ICMP_UGE:
2140 return AArch64CC::HS;
2141 case CmpInst::ICMP_ULT:
2142 return AArch64CC::LO;
2146 /// \brief Try to emit a combined compare-and-branch instruction.
2147 bool AArch64FastISel::emitCompareAndBranch(const BranchInst *BI) {
2148 assert(isa<CmpInst>(BI->getCondition()) && "Expected cmp instruction");
2149 const CmpInst *CI = cast<CmpInst>(BI->getCondition());
2150 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
2152 const Value *LHS = CI->getOperand(0);
2153 const Value *RHS = CI->getOperand(1);
2156 if (!isTypeSupported(LHS->getType(), VT))
2159 unsigned BW = VT.getSizeInBits();
2163 MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
2164 MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
2166 // Try to take advantage of fallthrough opportunities.
2167 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
2168 std::swap(TBB, FBB);
2169 Predicate = CmpInst::getInversePredicate(Predicate);
2174 switch (Predicate) {
2177 case CmpInst::ICMP_EQ:
2178 case CmpInst::ICMP_NE:
2179 if (isa<Constant>(LHS) && cast<Constant>(LHS)->isNullValue())
2180 std::swap(LHS, RHS);
2182 if (!isa<Constant>(RHS) || !cast<Constant>(RHS)->isNullValue())
2185 if (const auto *AI = dyn_cast<BinaryOperator>(LHS))
2186 if (AI->getOpcode() == Instruction::And && isValueAvailable(AI)) {
2187 const Value *AndLHS = AI->getOperand(0);
2188 const Value *AndRHS = AI->getOperand(1);
2190 if (const auto *C = dyn_cast<ConstantInt>(AndLHS))
2191 if (C->getValue().isPowerOf2())
2192 std::swap(AndLHS, AndRHS);
2194 if (const auto *C = dyn_cast<ConstantInt>(AndRHS))
2195 if (C->getValue().isPowerOf2()) {
2196 TestBit = C->getValue().logBase2();
2204 IsCmpNE = Predicate == CmpInst::ICMP_NE;
2206 case CmpInst::ICMP_SLT:
2207 case CmpInst::ICMP_SGE:
2208 if (!isa<Constant>(RHS) || !cast<Constant>(RHS)->isNullValue())
2212 IsCmpNE = Predicate == CmpInst::ICMP_SLT;
2214 case CmpInst::ICMP_SGT:
2215 case CmpInst::ICMP_SLE:
2216 if (!isa<ConstantInt>(RHS))
2219 if (cast<ConstantInt>(RHS)->getValue() != APInt(BW, -1, true))
2223 IsCmpNE = Predicate == CmpInst::ICMP_SLE;
2227 static const unsigned OpcTable[2][2][2] = {
2228 { {AArch64::CBZW, AArch64::CBZX },
2229 {AArch64::CBNZW, AArch64::CBNZX} },
2230 { {AArch64::TBZW, AArch64::TBZX },
2231 {AArch64::TBNZW, AArch64::TBNZX} }
2234 bool IsBitTest = TestBit != -1;
2235 bool Is64Bit = BW == 64;
2236 if (TestBit < 32 && TestBit >= 0)
2239 unsigned Opc = OpcTable[IsBitTest][IsCmpNE][Is64Bit];
2240 const MCInstrDesc &II = TII.get(Opc);
2242 unsigned SrcReg = getRegForValue(LHS);
2245 bool SrcIsKill = hasTrivialKill(LHS);
2247 if (BW == 64 && !Is64Bit)
2248 SrcReg = fastEmitInst_extractsubreg(MVT::i32, SrcReg, SrcIsKill,
2251 if ((BW < 32) && !IsBitTest)
2252 SrcReg = emitIntExt(VT, SrcReg, MVT::i32, /*IsZExt=*/true);
2254 // Emit the combined compare and branch instruction.
2255 SrcReg = constrainOperandRegClass(II, SrcReg, II.getNumDefs());
2256 MachineInstrBuilder MIB =
2257 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
2258 .addReg(SrcReg, getKillRegState(SrcIsKill));
2260 MIB.addImm(TestBit);
2263 finishCondBranch(BI->getParent(), TBB, FBB);
2267 bool AArch64FastISel::selectBranch(const Instruction *I) {
2268 const BranchInst *BI = cast<BranchInst>(I);
2269 if (BI->isUnconditional()) {
2270 MachineBasicBlock *MSucc = FuncInfo.MBBMap[BI->getSuccessor(0)];
2271 fastEmitBranch(MSucc, BI->getDebugLoc());
2275 MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
2276 MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
2278 AArch64CC::CondCode CC = AArch64CC::NE;
2279 if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
2280 if (CI->hasOneUse() && isValueAvailable(CI)) {
2281 // Try to optimize or fold the cmp.
2282 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
2283 switch (Predicate) {
2286 case CmpInst::FCMP_FALSE:
2287 fastEmitBranch(FBB, DbgLoc);
2289 case CmpInst::FCMP_TRUE:
2290 fastEmitBranch(TBB, DbgLoc);
2294 // Try to emit a combined compare-and-branch first.
2295 if (emitCompareAndBranch(BI))
2298 // Try to take advantage of fallthrough opportunities.
2299 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
2300 std::swap(TBB, FBB);
2301 Predicate = CmpInst::getInversePredicate(Predicate);
2305 if (!emitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
2308 // FCMP_UEQ and FCMP_ONE cannot be checked with a single branch
2310 CC = getCompareCC(Predicate);
2311 AArch64CC::CondCode ExtraCC = AArch64CC::AL;
2312 switch (Predicate) {
2315 case CmpInst::FCMP_UEQ:
2316 ExtraCC = AArch64CC::EQ;
2319 case CmpInst::FCMP_ONE:
2320 ExtraCC = AArch64CC::MI;
2324 assert((CC != AArch64CC::AL) && "Unexpected condition code.");
2326 // Emit the extra branch for FCMP_UEQ and FCMP_ONE.
2327 if (ExtraCC != AArch64CC::AL) {
2328 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::Bcc))
2334 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::Bcc))
2338 finishCondBranch(BI->getParent(), TBB, FBB);
2341 } else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) {
2343 if (TI->hasOneUse() && isValueAvailable(TI) &&
2344 isTypeSupported(TI->getOperand(0)->getType(), SrcVT)) {
2345 unsigned CondReg = getRegForValue(TI->getOperand(0));
2348 bool CondIsKill = hasTrivialKill(TI->getOperand(0));
2350 // Issue an extract_subreg to get the lower 32-bits.
2351 if (SrcVT == MVT::i64) {
2352 CondReg = fastEmitInst_extractsubreg(MVT::i32, CondReg, CondIsKill,
2357 unsigned ANDReg = emitAnd_ri(MVT::i32, CondReg, CondIsKill, 1);
2358 assert(ANDReg && "Unexpected AND instruction emission failure.");
2359 emitICmp_ri(MVT::i32, ANDReg, /*IsKill=*/true, 0);
2361 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
2362 std::swap(TBB, FBB);
2365 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::Bcc))
2369 finishCondBranch(BI->getParent(), TBB, FBB);
2372 } else if (const auto *CI = dyn_cast<ConstantInt>(BI->getCondition())) {
2373 uint64_t Imm = CI->getZExtValue();
2374 MachineBasicBlock *Target = (Imm == 0) ? FBB : TBB;
2375 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::B))
2378 // Obtain the branch weight and add the target to the successor list.
2379 uint32_t BranchWeight = 0;
2381 BranchWeight = FuncInfo.BPI->getEdgeWeight(BI->getParent(),
2382 Target->getBasicBlock());
2383 FuncInfo.MBB->addSuccessor(Target, BranchWeight);
2385 } else if (foldXALUIntrinsic(CC, I, BI->getCondition())) {
2386 // Fake request the condition, otherwise the intrinsic might be completely
2388 unsigned CondReg = getRegForValue(BI->getCondition());
2393 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::Bcc))
2397 finishCondBranch(BI->getParent(), TBB, FBB);
2401 unsigned CondReg = getRegForValue(BI->getCondition());
2404 bool CondRegIsKill = hasTrivialKill(BI->getCondition());
2406 // We've been divorced from our compare! Our block was split, and
2407 // now our compare lives in a predecessor block. We musn't
2408 // re-compare here, as the children of the compare aren't guaranteed
2409 // live across the block boundary (we *could* check for this).
2410 // Regardless, the compare has been done in the predecessor block,
2411 // and it left a value for us in a virtual register. Ergo, we test
2412 // the one-bit value left in the virtual register.
2414 // FIXME: Optimize this with TBZW/TBZNW.
2415 unsigned ANDReg = emitAnd_ri(MVT::i32, CondReg, CondRegIsKill, 1);
2416 assert(ANDReg && "Unexpected AND instruction emission failure.");
2417 emitICmp_ri(MVT::i32, ANDReg, /*IsKill=*/true, 0);
2419 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
2420 std::swap(TBB, FBB);
2424 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::Bcc))
2428 finishCondBranch(BI->getParent(), TBB, FBB);
2432 bool AArch64FastISel::selectIndirectBr(const Instruction *I) {
2433 const IndirectBrInst *BI = cast<IndirectBrInst>(I);
2434 unsigned AddrReg = getRegForValue(BI->getOperand(0));
2438 // Emit the indirect branch.
2439 const MCInstrDesc &II = TII.get(AArch64::BR);
2440 AddrReg = constrainOperandRegClass(II, AddrReg, II.getNumDefs());
2441 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II).addReg(AddrReg);
2443 // Make sure the CFG is up-to-date.
2444 for (auto *Succ : BI->successors())
2445 FuncInfo.MBB->addSuccessor(FuncInfo.MBBMap[Succ]);
2450 bool AArch64FastISel::selectCmp(const Instruction *I) {
2451 const CmpInst *CI = cast<CmpInst>(I);
2453 // Try to optimize or fold the cmp.
2454 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
2455 unsigned ResultReg = 0;
2456 switch (Predicate) {
2459 case CmpInst::FCMP_FALSE:
2460 ResultReg = createResultReg(&AArch64::GPR32RegClass);
2461 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2462 TII.get(TargetOpcode::COPY), ResultReg)
2463 .addReg(AArch64::WZR, getKillRegState(true));
2465 case CmpInst::FCMP_TRUE:
2466 ResultReg = fastEmit_i(MVT::i32, MVT::i32, ISD::Constant, 1);
2471 updateValueMap(I, ResultReg);
2476 if (!emitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
2479 ResultReg = createResultReg(&AArch64::GPR32RegClass);
2481 // FCMP_UEQ and FCMP_ONE cannot be checked with a single instruction. These
2482 // condition codes are inverted, because they are used by CSINC.
2483 static unsigned CondCodeTable[2][2] = {
2484 { AArch64CC::NE, AArch64CC::VC },
2485 { AArch64CC::PL, AArch64CC::LE }
2487 unsigned *CondCodes = nullptr;
2488 switch (Predicate) {
2491 case CmpInst::FCMP_UEQ:
2492 CondCodes = &CondCodeTable[0][0];
2494 case CmpInst::FCMP_ONE:
2495 CondCodes = &CondCodeTable[1][0];
2500 unsigned TmpReg1 = createResultReg(&AArch64::GPR32RegClass);
2501 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::CSINCWr),
2503 .addReg(AArch64::WZR, getKillRegState(true))
2504 .addReg(AArch64::WZR, getKillRegState(true))
2505 .addImm(CondCodes[0]);
2506 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::CSINCWr),
2508 .addReg(TmpReg1, getKillRegState(true))
2509 .addReg(AArch64::WZR, getKillRegState(true))
2510 .addImm(CondCodes[1]);
2512 updateValueMap(I, ResultReg);
2516 // Now set a register based on the comparison.
2517 AArch64CC::CondCode CC = getCompareCC(Predicate);
2518 assert((CC != AArch64CC::AL) && "Unexpected condition code.");
2519 AArch64CC::CondCode invertedCC = getInvertedCondCode(CC);
2520 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::CSINCWr),
2522 .addReg(AArch64::WZR, getKillRegState(true))
2523 .addReg(AArch64::WZR, getKillRegState(true))
2524 .addImm(invertedCC);
2526 updateValueMap(I, ResultReg);
2530 /// \brief Optimize selects of i1 if one of the operands has a 'true' or 'false'
2532 bool AArch64FastISel::optimizeSelect(const SelectInst *SI) {
2533 if (!SI->getType()->isIntegerTy(1))
2536 const Value *Src1Val, *Src2Val;
2538 bool NeedExtraOp = false;
2539 if (auto *CI = dyn_cast<ConstantInt>(SI->getTrueValue())) {
2541 Src1Val = SI->getCondition();
2542 Src2Val = SI->getFalseValue();
2543 Opc = AArch64::ORRWrr;
2545 assert(CI->isZero());
2546 Src1Val = SI->getFalseValue();
2547 Src2Val = SI->getCondition();
2548 Opc = AArch64::BICWrr;
2550 } else if (auto *CI = dyn_cast<ConstantInt>(SI->getFalseValue())) {
2552 Src1Val = SI->getCondition();
2553 Src2Val = SI->getTrueValue();
2554 Opc = AArch64::ORRWrr;
2557 assert(CI->isZero());
2558 Src1Val = SI->getCondition();
2559 Src2Val = SI->getTrueValue();
2560 Opc = AArch64::ANDWrr;
2567 unsigned Src1Reg = getRegForValue(Src1Val);
2570 bool Src1IsKill = hasTrivialKill(Src1Val);
2572 unsigned Src2Reg = getRegForValue(Src2Val);
2575 bool Src2IsKill = hasTrivialKill(Src2Val);
2578 Src1Reg = emitLogicalOp_ri(ISD::XOR, MVT::i32, Src1Reg, Src1IsKill, 1);
2581 unsigned ResultReg = fastEmitInst_rr(Opc, &AArch64::GPR32RegClass, Src1Reg,
2582 Src1IsKill, Src2Reg, Src2IsKill);
2583 updateValueMap(SI, ResultReg);
2587 bool AArch64FastISel::selectSelect(const Instruction *I) {
2588 assert(isa<SelectInst>(I) && "Expected a select instruction.");
2590 if (!isTypeSupported(I->getType(), VT))
2594 const TargetRegisterClass *RC;
2595 switch (VT.SimpleTy) {
2602 Opc = AArch64::CSELWr;
2603 RC = &AArch64::GPR32RegClass;
2606 Opc = AArch64::CSELXr;
2607 RC = &AArch64::GPR64RegClass;
2610 Opc = AArch64::FCSELSrrr;
2611 RC = &AArch64::FPR32RegClass;
2614 Opc = AArch64::FCSELDrrr;
2615 RC = &AArch64::FPR64RegClass;
2619 const SelectInst *SI = cast<SelectInst>(I);
2620 const Value *Cond = SI->getCondition();
2621 AArch64CC::CondCode CC = AArch64CC::NE;
2622 AArch64CC::CondCode ExtraCC = AArch64CC::AL;
2624 if (optimizeSelect(SI))
2627 // Try to pickup the flags, so we don't have to emit another compare.
2628 if (foldXALUIntrinsic(CC, I, Cond)) {
2629 // Fake request the condition to force emission of the XALU intrinsic.
2630 unsigned CondReg = getRegForValue(Cond);
2633 } else if (isa<CmpInst>(Cond) && cast<CmpInst>(Cond)->hasOneUse() &&
2634 isValueAvailable(Cond)) {
2635 const auto *Cmp = cast<CmpInst>(Cond);
2636 // Try to optimize or fold the cmp.
2637 CmpInst::Predicate Predicate = optimizeCmpPredicate(Cmp);
2638 const Value *FoldSelect = nullptr;
2639 switch (Predicate) {
2642 case CmpInst::FCMP_FALSE:
2643 FoldSelect = SI->getFalseValue();
2645 case CmpInst::FCMP_TRUE:
2646 FoldSelect = SI->getTrueValue();
2651 unsigned SrcReg = getRegForValue(FoldSelect);
2654 unsigned UseReg = lookUpRegForValue(SI);
2656 MRI.clearKillFlags(UseReg);
2658 updateValueMap(I, SrcReg);
2663 if (!emitCmp(Cmp->getOperand(0), Cmp->getOperand(1), Cmp->isUnsigned()))
2666 // FCMP_UEQ and FCMP_ONE cannot be checked with a single select instruction.
2667 CC = getCompareCC(Predicate);
2668 switch (Predicate) {
2671 case CmpInst::FCMP_UEQ:
2672 ExtraCC = AArch64CC::EQ;
2675 case CmpInst::FCMP_ONE:
2676 ExtraCC = AArch64CC::MI;
2680 assert((CC != AArch64CC::AL) && "Unexpected condition code.");
2682 unsigned CondReg = getRegForValue(Cond);
2685 bool CondIsKill = hasTrivialKill(Cond);
2687 const MCInstrDesc &II = TII.get(AArch64::ANDSWri);
2688 CondReg = constrainOperandRegClass(II, CondReg, 1);
2690 // Emit a TST instruction (ANDS wzr, reg, #imm).
2691 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II,
2693 .addReg(CondReg, getKillRegState(CondIsKill))
2694 .addImm(AArch64_AM::encodeLogicalImmediate(1, 32));
2697 unsigned Src1Reg = getRegForValue(SI->getTrueValue());
2698 bool Src1IsKill = hasTrivialKill(SI->getTrueValue());
2700 unsigned Src2Reg = getRegForValue(SI->getFalseValue());
2701 bool Src2IsKill = hasTrivialKill(SI->getFalseValue());
2703 if (!Src1Reg || !Src2Reg)
2706 if (ExtraCC != AArch64CC::AL) {
2707 Src2Reg = fastEmitInst_rri(Opc, RC, Src1Reg, Src1IsKill, Src2Reg,
2708 Src2IsKill, ExtraCC);
2711 unsigned ResultReg = fastEmitInst_rri(Opc, RC, Src1Reg, Src1IsKill, Src2Reg,
2713 updateValueMap(I, ResultReg);
2717 bool AArch64FastISel::selectFPExt(const Instruction *I) {
2718 Value *V = I->getOperand(0);
2719 if (!I->getType()->isDoubleTy() || !V->getType()->isFloatTy())
2722 unsigned Op = getRegForValue(V);
2726 unsigned ResultReg = createResultReg(&AArch64::FPR64RegClass);
2727 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::FCVTDSr),
2728 ResultReg).addReg(Op);
2729 updateValueMap(I, ResultReg);
2733 bool AArch64FastISel::selectFPTrunc(const Instruction *I) {
2734 Value *V = I->getOperand(0);
2735 if (!I->getType()->isFloatTy() || !V->getType()->isDoubleTy())
2738 unsigned Op = getRegForValue(V);
2742 unsigned ResultReg = createResultReg(&AArch64::FPR32RegClass);
2743 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::FCVTSDr),
2744 ResultReg).addReg(Op);
2745 updateValueMap(I, ResultReg);
2749 // FPToUI and FPToSI
2750 bool AArch64FastISel::selectFPToInt(const Instruction *I, bool Signed) {
2752 if (!isTypeLegal(I->getType(), DestVT) || DestVT.isVector())
2755 unsigned SrcReg = getRegForValue(I->getOperand(0));
2759 EVT SrcVT = TLI.getValueType(DL, I->getOperand(0)->getType(), true);
2760 if (SrcVT == MVT::f128)
2764 if (SrcVT == MVT::f64) {
2766 Opc = (DestVT == MVT::i32) ? AArch64::FCVTZSUWDr : AArch64::FCVTZSUXDr;
2768 Opc = (DestVT == MVT::i32) ? AArch64::FCVTZUUWDr : AArch64::FCVTZUUXDr;
2771 Opc = (DestVT == MVT::i32) ? AArch64::FCVTZSUWSr : AArch64::FCVTZSUXSr;
2773 Opc = (DestVT == MVT::i32) ? AArch64::FCVTZUUWSr : AArch64::FCVTZUUXSr;
2775 unsigned ResultReg = createResultReg(
2776 DestVT == MVT::i32 ? &AArch64::GPR32RegClass : &AArch64::GPR64RegClass);
2777 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
2779 updateValueMap(I, ResultReg);
2783 bool AArch64FastISel::selectIntToFP(const Instruction *I, bool Signed) {
2785 if (!isTypeLegal(I->getType(), DestVT) || DestVT.isVector())
2787 assert ((DestVT == MVT::f32 || DestVT == MVT::f64) &&
2788 "Unexpected value type.");
2790 unsigned SrcReg = getRegForValue(I->getOperand(0));
2793 bool SrcIsKill = hasTrivialKill(I->getOperand(0));
2795 EVT SrcVT = TLI.getValueType(DL, I->getOperand(0)->getType(), true);
2797 // Handle sign-extension.
2798 if (SrcVT == MVT::i16 || SrcVT == MVT::i8 || SrcVT == MVT::i1) {
2800 emitIntExt(SrcVT.getSimpleVT(), SrcReg, MVT::i32, /*isZExt*/ !Signed);
2807 if (SrcVT == MVT::i64) {
2809 Opc = (DestVT == MVT::f32) ? AArch64::SCVTFUXSri : AArch64::SCVTFUXDri;
2811 Opc = (DestVT == MVT::f32) ? AArch64::UCVTFUXSri : AArch64::UCVTFUXDri;
2814 Opc = (DestVT == MVT::f32) ? AArch64::SCVTFUWSri : AArch64::SCVTFUWDri;
2816 Opc = (DestVT == MVT::f32) ? AArch64::UCVTFUWSri : AArch64::UCVTFUWDri;
2819 unsigned ResultReg = fastEmitInst_r(Opc, TLI.getRegClassFor(DestVT), SrcReg,
2821 updateValueMap(I, ResultReg);
2825 bool AArch64FastISel::fastLowerArguments() {
2826 if (!FuncInfo.CanLowerReturn)
2829 const Function *F = FuncInfo.Fn;
2833 CallingConv::ID CC = F->getCallingConv();
2834 if (CC != CallingConv::C)
2837 // Only handle simple cases of up to 8 GPR and FPR each.
2838 unsigned GPRCnt = 0;
2839 unsigned FPRCnt = 0;
2841 for (auto const &Arg : F->args()) {
2842 // The first argument is at index 1.
2844 if (F->getAttributes().hasAttribute(Idx, Attribute::ByVal) ||
2845 F->getAttributes().hasAttribute(Idx, Attribute::InReg) ||
2846 F->getAttributes().hasAttribute(Idx, Attribute::StructRet) ||
2847 F->getAttributes().hasAttribute(Idx, Attribute::Nest))
2850 Type *ArgTy = Arg.getType();
2851 if (ArgTy->isStructTy() || ArgTy->isArrayTy())
2854 EVT ArgVT = TLI.getValueType(DL, ArgTy);
2855 if (!ArgVT.isSimple())
2858 MVT VT = ArgVT.getSimpleVT().SimpleTy;
2859 if (VT.isFloatingPoint() && !Subtarget->hasFPARMv8())
2862 if (VT.isVector() &&
2863 (!Subtarget->hasNEON() || !Subtarget->isLittleEndian()))
2866 if (VT >= MVT::i1 && VT <= MVT::i64)
2868 else if ((VT >= MVT::f16 && VT <= MVT::f64) || VT.is64BitVector() ||
2869 VT.is128BitVector())
2874 if (GPRCnt > 8 || FPRCnt > 8)
2878 static const MCPhysReg Registers[6][8] = {
2879 { AArch64::W0, AArch64::W1, AArch64::W2, AArch64::W3, AArch64::W4,
2880 AArch64::W5, AArch64::W6, AArch64::W7 },
2881 { AArch64::X0, AArch64::X1, AArch64::X2, AArch64::X3, AArch64::X4,
2882 AArch64::X5, AArch64::X6, AArch64::X7 },
2883 { AArch64::H0, AArch64::H1, AArch64::H2, AArch64::H3, AArch64::H4,
2884 AArch64::H5, AArch64::H6, AArch64::H7 },
2885 { AArch64::S0, AArch64::S1, AArch64::S2, AArch64::S3, AArch64::S4,
2886 AArch64::S5, AArch64::S6, AArch64::S7 },
2887 { AArch64::D0, AArch64::D1, AArch64::D2, AArch64::D3, AArch64::D4,
2888 AArch64::D5, AArch64::D6, AArch64::D7 },
2889 { AArch64::Q0, AArch64::Q1, AArch64::Q2, AArch64::Q3, AArch64::Q4,
2890 AArch64::Q5, AArch64::Q6, AArch64::Q7 }
2893 unsigned GPRIdx = 0;
2894 unsigned FPRIdx = 0;
2895 for (auto const &Arg : F->args()) {
2896 MVT VT = TLI.getSimpleValueType(DL, Arg.getType());
2898 const TargetRegisterClass *RC;
2899 if (VT >= MVT::i1 && VT <= MVT::i32) {
2900 SrcReg = Registers[0][GPRIdx++];
2901 RC = &AArch64::GPR32RegClass;
2903 } else if (VT == MVT::i64) {
2904 SrcReg = Registers[1][GPRIdx++];
2905 RC = &AArch64::GPR64RegClass;
2906 } else if (VT == MVT::f16) {
2907 SrcReg = Registers[2][FPRIdx++];
2908 RC = &AArch64::FPR16RegClass;
2909 } else if (VT == MVT::f32) {
2910 SrcReg = Registers[3][FPRIdx++];
2911 RC = &AArch64::FPR32RegClass;
2912 } else if ((VT == MVT::f64) || VT.is64BitVector()) {
2913 SrcReg = Registers[4][FPRIdx++];
2914 RC = &AArch64::FPR64RegClass;
2915 } else if (VT.is128BitVector()) {
2916 SrcReg = Registers[5][FPRIdx++];
2917 RC = &AArch64::FPR128RegClass;
2919 llvm_unreachable("Unexpected value type.");
2921 unsigned DstReg = FuncInfo.MF->addLiveIn(SrcReg, RC);
2922 // FIXME: Unfortunately it's necessary to emit a copy from the livein copy.
2923 // Without this, EmitLiveInCopies may eliminate the livein if its only
2924 // use is a bitcast (which isn't turned into an instruction).
2925 unsigned ResultReg = createResultReg(RC);
2926 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2927 TII.get(TargetOpcode::COPY), ResultReg)
2928 .addReg(DstReg, getKillRegState(true));
2929 updateValueMap(&Arg, ResultReg);
2934 bool AArch64FastISel::processCallArgs(CallLoweringInfo &CLI,
2935 SmallVectorImpl<MVT> &OutVTs,
2936 unsigned &NumBytes) {
2937 CallingConv::ID CC = CLI.CallConv;
2938 SmallVector<CCValAssign, 16> ArgLocs;
2939 CCState CCInfo(CC, false, *FuncInfo.MF, ArgLocs, *Context);
2940 CCInfo.AnalyzeCallOperands(OutVTs, CLI.OutFlags, CCAssignFnForCall(CC));
2942 // Get a count of how many bytes are to be pushed on the stack.
2943 NumBytes = CCInfo.getNextStackOffset();
2945 // Issue CALLSEQ_START
2946 unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
2947 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackDown))
2950 // Process the args.
2951 for (CCValAssign &VA : ArgLocs) {
2952 const Value *ArgVal = CLI.OutVals[VA.getValNo()];
2953 MVT ArgVT = OutVTs[VA.getValNo()];
2955 unsigned ArgReg = getRegForValue(ArgVal);
2959 // Handle arg promotion: SExt, ZExt, AExt.
2960 switch (VA.getLocInfo()) {
2961 case CCValAssign::Full:
2963 case CCValAssign::SExt: {
2964 MVT DestVT = VA.getLocVT();
2966 ArgReg = emitIntExt(SrcVT, ArgReg, DestVT, /*isZExt=*/false);
2971 case CCValAssign::AExt:
2972 // Intentional fall-through.
2973 case CCValAssign::ZExt: {
2974 MVT DestVT = VA.getLocVT();
2976 ArgReg = emitIntExt(SrcVT, ArgReg, DestVT, /*isZExt=*/true);
2982 llvm_unreachable("Unknown arg promotion!");
2985 // Now copy/store arg to correct locations.
2986 if (VA.isRegLoc() && !VA.needsCustom()) {
2987 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2988 TII.get(TargetOpcode::COPY), VA.getLocReg()).addReg(ArgReg);
2989 CLI.OutRegs.push_back(VA.getLocReg());
2990 } else if (VA.needsCustom()) {
2991 // FIXME: Handle custom args.
2994 assert(VA.isMemLoc() && "Assuming store on stack.");
2996 // Don't emit stores for undef values.
2997 if (isa<UndefValue>(ArgVal))
3000 // Need to store on the stack.
3001 unsigned ArgSize = (ArgVT.getSizeInBits() + 7) / 8;
3003 unsigned BEAlign = 0;
3004 if (ArgSize < 8 && !Subtarget->isLittleEndian())
3005 BEAlign = 8 - ArgSize;
3008 Addr.setKind(Address::RegBase);
3009 Addr.setReg(AArch64::SP);
3010 Addr.setOffset(VA.getLocMemOffset() + BEAlign);
3012 unsigned Alignment = DL.getABITypeAlignment(ArgVal->getType());
3013 MachineMemOperand *MMO = FuncInfo.MF->getMachineMemOperand(
3014 MachinePointerInfo::getStack(*FuncInfo.MF, Addr.getOffset()),
3015 MachineMemOperand::MOStore, ArgVT.getStoreSize(), Alignment);
3017 if (!emitStore(ArgVT, ArgReg, Addr, MMO))
3024 bool AArch64FastISel::finishCall(CallLoweringInfo &CLI, MVT RetVT,
3025 unsigned NumBytes) {
3026 CallingConv::ID CC = CLI.CallConv;
3028 // Issue CALLSEQ_END
3029 unsigned AdjStackUp = TII.getCallFrameDestroyOpcode();
3030 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackUp))
3031 .addImm(NumBytes).addImm(0);
3033 // Now the return value.
3034 if (RetVT != MVT::isVoid) {
3035 SmallVector<CCValAssign, 16> RVLocs;
3036 CCState CCInfo(CC, false, *FuncInfo.MF, RVLocs, *Context);
3037 CCInfo.AnalyzeCallResult(RetVT, CCAssignFnForCall(CC));
3039 // Only handle a single return value.
3040 if (RVLocs.size() != 1)
3043 // Copy all of the result registers out of their specified physreg.
3044 MVT CopyVT = RVLocs[0].getValVT();
3046 // TODO: Handle big-endian results
3047 if (CopyVT.isVector() && !Subtarget->isLittleEndian())
3050 unsigned ResultReg = createResultReg(TLI.getRegClassFor(CopyVT));
3051 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3052 TII.get(TargetOpcode::COPY), ResultReg)
3053 .addReg(RVLocs[0].getLocReg());
3054 CLI.InRegs.push_back(RVLocs[0].getLocReg());
3056 CLI.ResultReg = ResultReg;
3057 CLI.NumResultRegs = 1;
3063 bool AArch64FastISel::fastLowerCall(CallLoweringInfo &CLI) {
3064 CallingConv::ID CC = CLI.CallConv;
3065 bool IsTailCall = CLI.IsTailCall;
3066 bool IsVarArg = CLI.IsVarArg;
3067 const Value *Callee = CLI.Callee;
3068 MCSymbol *Symbol = CLI.Symbol;
3070 if (!Callee && !Symbol)
3073 // Allow SelectionDAG isel to handle tail calls.
3077 CodeModel::Model CM = TM.getCodeModel();
3078 // Only support the small and large code model.
3079 if (CM != CodeModel::Small && CM != CodeModel::Large)
3082 // FIXME: Add large code model support for ELF.
3083 if (CM == CodeModel::Large && !Subtarget->isTargetMachO())
3086 // Let SDISel handle vararg functions.
3090 // FIXME: Only handle *simple* calls for now.
3092 if (CLI.RetTy->isVoidTy())
3093 RetVT = MVT::isVoid;
3094 else if (!isTypeLegal(CLI.RetTy, RetVT))
3097 for (auto Flag : CLI.OutFlags)
3098 if (Flag.isInReg() || Flag.isSRet() || Flag.isNest() || Flag.isByVal())
3101 // Set up the argument vectors.
3102 SmallVector<MVT, 16> OutVTs;
3103 OutVTs.reserve(CLI.OutVals.size());
3105 for (auto *Val : CLI.OutVals) {
3107 if (!isTypeLegal(Val->getType(), VT) &&
3108 !(VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16))
3111 // We don't handle vector parameters yet.
3112 if (VT.isVector() || VT.getSizeInBits() > 64)
3115 OutVTs.push_back(VT);
3119 if (Callee && !computeCallAddress(Callee, Addr))
3122 // Handle the arguments now that we've gotten them.
3124 if (!processCallArgs(CLI, OutVTs, NumBytes))
3128 MachineInstrBuilder MIB;
3129 if (CM == CodeModel::Small) {
3130 const MCInstrDesc &II = TII.get(Addr.getReg() ? AArch64::BLR : AArch64::BL);
3131 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II);
3133 MIB.addSym(Symbol, 0);
3134 else if (Addr.getGlobalValue())
3135 MIB.addGlobalAddress(Addr.getGlobalValue(), 0, 0);
3136 else if (Addr.getReg()) {
3137 unsigned Reg = constrainOperandRegClass(II, Addr.getReg(), 0);
3142 unsigned CallReg = 0;
3144 unsigned ADRPReg = createResultReg(&AArch64::GPR64commonRegClass);
3145 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
3147 .addSym(Symbol, AArch64II::MO_GOT | AArch64II::MO_PAGE);
3149 CallReg = createResultReg(&AArch64::GPR64RegClass);
3150 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3151 TII.get(AArch64::LDRXui), CallReg)
3154 AArch64II::MO_GOT | AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
3155 } else if (Addr.getGlobalValue())
3156 CallReg = materializeGV(Addr.getGlobalValue());
3157 else if (Addr.getReg())
3158 CallReg = Addr.getReg();
3163 const MCInstrDesc &II = TII.get(AArch64::BLR);
3164 CallReg = constrainOperandRegClass(II, CallReg, 0);
3165 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II).addReg(CallReg);
3168 // Add implicit physical register uses to the call.
3169 for (auto Reg : CLI.OutRegs)
3170 MIB.addReg(Reg, RegState::Implicit);
3172 // Add a register mask with the call-preserved registers.
3173 // Proper defs for return values will be added by setPhysRegsDeadExcept().
3174 MIB.addRegMask(TRI.getCallPreservedMask(*FuncInfo.MF, CC));
3178 // Finish off the call including any return values.
3179 return finishCall(CLI, RetVT, NumBytes);
3182 bool AArch64FastISel::isMemCpySmall(uint64_t Len, unsigned Alignment) {
3184 return Len / Alignment <= 4;
3189 bool AArch64FastISel::tryEmitSmallMemCpy(Address Dest, Address Src,
3190 uint64_t Len, unsigned Alignment) {
3191 // Make sure we don't bloat code by inlining very large memcpy's.
3192 if (!isMemCpySmall(Len, Alignment))
3195 int64_t UnscaledOffset = 0;
3196 Address OrigDest = Dest;
3197 Address OrigSrc = Src;
3201 if (!Alignment || Alignment >= 8) {
3212 // Bound based on alignment.
3213 if (Len >= 4 && Alignment == 4)
3215 else if (Len >= 2 && Alignment == 2)
3222 unsigned ResultReg = emitLoad(VT, VT, Src);
3226 if (!emitStore(VT, ResultReg, Dest))
3229 int64_t Size = VT.getSizeInBits() / 8;
3231 UnscaledOffset += Size;
3233 // We need to recompute the unscaled offset for each iteration.
3234 Dest.setOffset(OrigDest.getOffset() + UnscaledOffset);
3235 Src.setOffset(OrigSrc.getOffset() + UnscaledOffset);
3241 /// \brief Check if it is possible to fold the condition from the XALU intrinsic
3242 /// into the user. The condition code will only be updated on success.
3243 bool AArch64FastISel::foldXALUIntrinsic(AArch64CC::CondCode &CC,
3244 const Instruction *I,
3245 const Value *Cond) {
3246 if (!isa<ExtractValueInst>(Cond))
3249 const auto *EV = cast<ExtractValueInst>(Cond);
3250 if (!isa<IntrinsicInst>(EV->getAggregateOperand()))
3253 const auto *II = cast<IntrinsicInst>(EV->getAggregateOperand());
3255 const Function *Callee = II->getCalledFunction();
3257 cast<StructType>(Callee->getReturnType())->getTypeAtIndex(0U);
3258 if (!isTypeLegal(RetTy, RetVT))
3261 if (RetVT != MVT::i32 && RetVT != MVT::i64)
3264 const Value *LHS = II->getArgOperand(0);
3265 const Value *RHS = II->getArgOperand(1);
3267 // Canonicalize immediate to the RHS.
3268 if (isa<ConstantInt>(LHS) && !isa<ConstantInt>(RHS) &&
3269 isCommutativeIntrinsic(II))
3270 std::swap(LHS, RHS);
3272 // Simplify multiplies.
3273 Intrinsic::ID IID = II->getIntrinsicID();
3277 case Intrinsic::smul_with_overflow:
3278 if (const auto *C = dyn_cast<ConstantInt>(RHS))
3279 if (C->getValue() == 2)
3280 IID = Intrinsic::sadd_with_overflow;
3282 case Intrinsic::umul_with_overflow:
3283 if (const auto *C = dyn_cast<ConstantInt>(RHS))
3284 if (C->getValue() == 2)
3285 IID = Intrinsic::uadd_with_overflow;
3289 AArch64CC::CondCode TmpCC;
3293 case Intrinsic::sadd_with_overflow:
3294 case Intrinsic::ssub_with_overflow:
3295 TmpCC = AArch64CC::VS;
3297 case Intrinsic::uadd_with_overflow:
3298 TmpCC = AArch64CC::HS;
3300 case Intrinsic::usub_with_overflow:
3301 TmpCC = AArch64CC::LO;
3303 case Intrinsic::smul_with_overflow:
3304 case Intrinsic::umul_with_overflow:
3305 TmpCC = AArch64CC::NE;
3309 // Check if both instructions are in the same basic block.
3310 if (!isValueAvailable(II))
3313 // Make sure nothing is in the way
3314 BasicBlock::const_iterator Start(I);
3315 BasicBlock::const_iterator End(II);
3316 for (auto Itr = std::prev(Start); Itr != End; --Itr) {
3317 // We only expect extractvalue instructions between the intrinsic and the
3318 // instruction to be selected.
3319 if (!isa<ExtractValueInst>(Itr))
3322 // Check that the extractvalue operand comes from the intrinsic.
3323 const auto *EVI = cast<ExtractValueInst>(Itr);
3324 if (EVI->getAggregateOperand() != II)
3332 bool AArch64FastISel::fastLowerIntrinsicCall(const IntrinsicInst *II) {
3333 // FIXME: Handle more intrinsics.
3334 switch (II->getIntrinsicID()) {
3335 default: return false;
3336 case Intrinsic::frameaddress: {
3337 MachineFrameInfo *MFI = FuncInfo.MF->getFrameInfo();
3338 MFI->setFrameAddressIsTaken(true);
3340 const AArch64RegisterInfo *RegInfo =
3341 static_cast<const AArch64RegisterInfo *>(Subtarget->getRegisterInfo());
3342 unsigned FramePtr = RegInfo->getFrameRegister(*(FuncInfo.MF));
3343 unsigned SrcReg = MRI.createVirtualRegister(&AArch64::GPR64RegClass);
3344 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3345 TII.get(TargetOpcode::COPY), SrcReg).addReg(FramePtr);
3346 // Recursively load frame address
3352 unsigned Depth = cast<ConstantInt>(II->getOperand(0))->getZExtValue();
3354 DestReg = fastEmitInst_ri(AArch64::LDRXui, &AArch64::GPR64RegClass,
3355 SrcReg, /*IsKill=*/true, 0);
3356 assert(DestReg && "Unexpected LDR instruction emission failure.");
3360 updateValueMap(II, SrcReg);
3363 case Intrinsic::memcpy:
3364 case Intrinsic::memmove: {
3365 const auto *MTI = cast<MemTransferInst>(II);
3366 // Don't handle volatile.
3367 if (MTI->isVolatile())
3370 // Disable inlining for memmove before calls to ComputeAddress. Otherwise,
3371 // we would emit dead code because we don't currently handle memmoves.
3372 bool IsMemCpy = (II->getIntrinsicID() == Intrinsic::memcpy);
3373 if (isa<ConstantInt>(MTI->getLength()) && IsMemCpy) {
3374 // Small memcpy's are common enough that we want to do them without a call
3376 uint64_t Len = cast<ConstantInt>(MTI->getLength())->getZExtValue();
3377 unsigned Alignment = MTI->getAlignment();
3378 if (isMemCpySmall(Len, Alignment)) {
3380 if (!computeAddress(MTI->getRawDest(), Dest) ||
3381 !computeAddress(MTI->getRawSource(), Src))
3383 if (tryEmitSmallMemCpy(Dest, Src, Len, Alignment))
3388 if (!MTI->getLength()->getType()->isIntegerTy(64))
3391 if (MTI->getSourceAddressSpace() > 255 || MTI->getDestAddressSpace() > 255)
3392 // Fast instruction selection doesn't support the special
3396 const char *IntrMemName = isa<MemCpyInst>(II) ? "memcpy" : "memmove";
3397 return lowerCallTo(II, IntrMemName, II->getNumArgOperands() - 2);
3399 case Intrinsic::memset: {
3400 const MemSetInst *MSI = cast<MemSetInst>(II);
3401 // Don't handle volatile.
3402 if (MSI->isVolatile())
3405 if (!MSI->getLength()->getType()->isIntegerTy(64))
3408 if (MSI->getDestAddressSpace() > 255)
3409 // Fast instruction selection doesn't support the special
3413 return lowerCallTo(II, "memset", II->getNumArgOperands() - 2);
3415 case Intrinsic::sin:
3416 case Intrinsic::cos:
3417 case Intrinsic::pow: {
3419 if (!isTypeLegal(II->getType(), RetVT))
3422 if (RetVT != MVT::f32 && RetVT != MVT::f64)
3425 static const RTLIB::Libcall LibCallTable[3][2] = {
3426 { RTLIB::SIN_F32, RTLIB::SIN_F64 },
3427 { RTLIB::COS_F32, RTLIB::COS_F64 },
3428 { RTLIB::POW_F32, RTLIB::POW_F64 }
3431 bool Is64Bit = RetVT == MVT::f64;
3432 switch (II->getIntrinsicID()) {
3434 llvm_unreachable("Unexpected intrinsic.");
3435 case Intrinsic::sin:
3436 LC = LibCallTable[0][Is64Bit];
3438 case Intrinsic::cos:
3439 LC = LibCallTable[1][Is64Bit];
3441 case Intrinsic::pow:
3442 LC = LibCallTable[2][Is64Bit];
3447 Args.reserve(II->getNumArgOperands());
3449 // Populate the argument list.
3450 for (auto &Arg : II->arg_operands()) {
3453 Entry.Ty = Arg->getType();
3454 Args.push_back(Entry);
3457 CallLoweringInfo CLI;
3458 MCContext &Ctx = MF->getContext();
3459 CLI.setCallee(DL, Ctx, TLI.getLibcallCallingConv(LC), II->getType(),
3460 TLI.getLibcallName(LC), std::move(Args));
3461 if (!lowerCallTo(CLI))
3463 updateValueMap(II, CLI.ResultReg);
3466 case Intrinsic::fabs: {
3468 if (!isTypeLegal(II->getType(), VT))
3472 switch (VT.SimpleTy) {
3476 Opc = AArch64::FABSSr;
3479 Opc = AArch64::FABSDr;
3482 unsigned SrcReg = getRegForValue(II->getOperand(0));
3485 bool SrcRegIsKill = hasTrivialKill(II->getOperand(0));
3486 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
3487 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
3488 .addReg(SrcReg, getKillRegState(SrcRegIsKill));
3489 updateValueMap(II, ResultReg);
3492 case Intrinsic::trap: {
3493 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::BRK))
3497 case Intrinsic::sqrt: {
3498 Type *RetTy = II->getCalledFunction()->getReturnType();
3501 if (!isTypeLegal(RetTy, VT))
3504 unsigned Op0Reg = getRegForValue(II->getOperand(0));
3507 bool Op0IsKill = hasTrivialKill(II->getOperand(0));
3509 unsigned ResultReg = fastEmit_r(VT, VT, ISD::FSQRT, Op0Reg, Op0IsKill);
3513 updateValueMap(II, ResultReg);
3516 case Intrinsic::sadd_with_overflow:
3517 case Intrinsic::uadd_with_overflow:
3518 case Intrinsic::ssub_with_overflow:
3519 case Intrinsic::usub_with_overflow:
3520 case Intrinsic::smul_with_overflow:
3521 case Intrinsic::umul_with_overflow: {
3522 // This implements the basic lowering of the xalu with overflow intrinsics.
3523 const Function *Callee = II->getCalledFunction();
3524 auto *Ty = cast<StructType>(Callee->getReturnType());
3525 Type *RetTy = Ty->getTypeAtIndex(0U);
3528 if (!isTypeLegal(RetTy, VT))
3531 if (VT != MVT::i32 && VT != MVT::i64)
3534 const Value *LHS = II->getArgOperand(0);
3535 const Value *RHS = II->getArgOperand(1);
3536 // Canonicalize immediate to the RHS.
3537 if (isa<ConstantInt>(LHS) && !isa<ConstantInt>(RHS) &&
3538 isCommutativeIntrinsic(II))
3539 std::swap(LHS, RHS);
3541 // Simplify multiplies.
3542 Intrinsic::ID IID = II->getIntrinsicID();
3546 case Intrinsic::smul_with_overflow:
3547 if (const auto *C = dyn_cast<ConstantInt>(RHS))
3548 if (C->getValue() == 2) {
3549 IID = Intrinsic::sadd_with_overflow;
3553 case Intrinsic::umul_with_overflow:
3554 if (const auto *C = dyn_cast<ConstantInt>(RHS))
3555 if (C->getValue() == 2) {
3556 IID = Intrinsic::uadd_with_overflow;
3562 unsigned ResultReg1 = 0, ResultReg2 = 0, MulReg = 0;
3563 AArch64CC::CondCode CC = AArch64CC::Invalid;
3565 default: llvm_unreachable("Unexpected intrinsic!");
3566 case Intrinsic::sadd_with_overflow:
3567 ResultReg1 = emitAdd(VT, LHS, RHS, /*SetFlags=*/true);
3570 case Intrinsic::uadd_with_overflow:
3571 ResultReg1 = emitAdd(VT, LHS, RHS, /*SetFlags=*/true);
3574 case Intrinsic::ssub_with_overflow:
3575 ResultReg1 = emitSub(VT, LHS, RHS, /*SetFlags=*/true);
3578 case Intrinsic::usub_with_overflow:
3579 ResultReg1 = emitSub(VT, LHS, RHS, /*SetFlags=*/true);
3582 case Intrinsic::smul_with_overflow: {
3584 unsigned LHSReg = getRegForValue(LHS);
3587 bool LHSIsKill = hasTrivialKill(LHS);
3589 unsigned RHSReg = getRegForValue(RHS);
3592 bool RHSIsKill = hasTrivialKill(RHS);
3594 if (VT == MVT::i32) {
3595 MulReg = emitSMULL_rr(MVT::i64, LHSReg, LHSIsKill, RHSReg, RHSIsKill);
3596 unsigned ShiftReg = emitLSR_ri(MVT::i64, MVT::i64, MulReg,
3597 /*IsKill=*/false, 32);
3598 MulReg = fastEmitInst_extractsubreg(VT, MulReg, /*IsKill=*/true,
3600 ShiftReg = fastEmitInst_extractsubreg(VT, ShiftReg, /*IsKill=*/true,
3602 emitSubs_rs(VT, ShiftReg, /*IsKill=*/true, MulReg, /*IsKill=*/false,
3603 AArch64_AM::ASR, 31, /*WantResult=*/false);
3605 assert(VT == MVT::i64 && "Unexpected value type.");
3606 // LHSReg and RHSReg cannot be killed by this Mul, since they are
3607 // reused in the next instruction.
3608 MulReg = emitMul_rr(VT, LHSReg, /*IsKill=*/false, RHSReg,
3610 unsigned SMULHReg = fastEmit_rr(VT, VT, ISD::MULHS, LHSReg, LHSIsKill,
3612 emitSubs_rs(VT, SMULHReg, /*IsKill=*/true, MulReg, /*IsKill=*/false,
3613 AArch64_AM::ASR, 63, /*WantResult=*/false);
3617 case Intrinsic::umul_with_overflow: {
3619 unsigned LHSReg = getRegForValue(LHS);
3622 bool LHSIsKill = hasTrivialKill(LHS);
3624 unsigned RHSReg = getRegForValue(RHS);
3627 bool RHSIsKill = hasTrivialKill(RHS);
3629 if (VT == MVT::i32) {
3630 MulReg = emitUMULL_rr(MVT::i64, LHSReg, LHSIsKill, RHSReg, RHSIsKill);
3631 emitSubs_rs(MVT::i64, AArch64::XZR, /*IsKill=*/true, MulReg,
3632 /*IsKill=*/false, AArch64_AM::LSR, 32,
3633 /*WantResult=*/false);
3634 MulReg = fastEmitInst_extractsubreg(VT, MulReg, /*IsKill=*/true,
3637 assert(VT == MVT::i64 && "Unexpected value type.");
3638 // LHSReg and RHSReg cannot be killed by this Mul, since they are
3639 // reused in the next instruction.
3640 MulReg = emitMul_rr(VT, LHSReg, /*IsKill=*/false, RHSReg,
3642 unsigned UMULHReg = fastEmit_rr(VT, VT, ISD::MULHU, LHSReg, LHSIsKill,
3644 emitSubs_rr(VT, AArch64::XZR, /*IsKill=*/true, UMULHReg,
3645 /*IsKill=*/false, /*WantResult=*/false);
3652 ResultReg1 = createResultReg(TLI.getRegClassFor(VT));
3653 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3654 TII.get(TargetOpcode::COPY), ResultReg1).addReg(MulReg);
3657 ResultReg2 = fastEmitInst_rri(AArch64::CSINCWr, &AArch64::GPR32RegClass,
3658 AArch64::WZR, /*IsKill=*/true, AArch64::WZR,
3659 /*IsKill=*/true, getInvertedCondCode(CC));
3661 assert((ResultReg1 + 1) == ResultReg2 &&
3662 "Nonconsecutive result registers.");
3663 updateValueMap(II, ResultReg1, 2);
3670 bool AArch64FastISel::selectRet(const Instruction *I) {
3671 const ReturnInst *Ret = cast<ReturnInst>(I);
3672 const Function &F = *I->getParent()->getParent();
3674 if (!FuncInfo.CanLowerReturn)
3680 // Build a list of return value registers.
3681 SmallVector<unsigned, 4> RetRegs;
3683 if (Ret->getNumOperands() > 0) {
3684 CallingConv::ID CC = F.getCallingConv();
3685 SmallVector<ISD::OutputArg, 4> Outs;
3686 GetReturnInfo(F.getReturnType(), F.getAttributes(), Outs, TLI, DL);
3688 // Analyze operands of the call, assigning locations to each operand.
3689 SmallVector<CCValAssign, 16> ValLocs;
3690 CCState CCInfo(CC, F.isVarArg(), *FuncInfo.MF, ValLocs, I->getContext());
3691 CCAssignFn *RetCC = CC == CallingConv::WebKit_JS ? RetCC_AArch64_WebKit_JS
3692 : RetCC_AArch64_AAPCS;
3693 CCInfo.AnalyzeReturn(Outs, RetCC);
3695 // Only handle a single return value for now.
3696 if (ValLocs.size() != 1)
3699 CCValAssign &VA = ValLocs[0];
3700 const Value *RV = Ret->getOperand(0);
3702 // Don't bother handling odd stuff for now.
3703 if ((VA.getLocInfo() != CCValAssign::Full) &&
3704 (VA.getLocInfo() != CCValAssign::BCvt))
3707 // Only handle register returns for now.
3711 unsigned Reg = getRegForValue(RV);
3715 unsigned SrcReg = Reg + VA.getValNo();
3716 unsigned DestReg = VA.getLocReg();
3717 // Avoid a cross-class copy. This is very unlikely.
3718 if (!MRI.getRegClass(SrcReg)->contains(DestReg))
3721 EVT RVEVT = TLI.getValueType(DL, RV->getType());
3722 if (!RVEVT.isSimple())
3725 // Vectors (of > 1 lane) in big endian need tricky handling.
3726 if (RVEVT.isVector() && RVEVT.getVectorNumElements() > 1 &&
3727 !Subtarget->isLittleEndian())
3730 MVT RVVT = RVEVT.getSimpleVT();
3731 if (RVVT == MVT::f128)
3734 MVT DestVT = VA.getValVT();
3735 // Special handling for extended integers.
3736 if (RVVT != DestVT) {
3737 if (RVVT != MVT::i1 && RVVT != MVT::i8 && RVVT != MVT::i16)
3740 if (!Outs[0].Flags.isZExt() && !Outs[0].Flags.isSExt())
3743 bool IsZExt = Outs[0].Flags.isZExt();
3744 SrcReg = emitIntExt(RVVT, SrcReg, DestVT, IsZExt);
3750 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3751 TII.get(TargetOpcode::COPY), DestReg).addReg(SrcReg);
3753 // Add register to return instruction.
3754 RetRegs.push_back(VA.getLocReg());
3757 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3758 TII.get(AArch64::RET_ReallyLR));
3759 for (unsigned RetReg : RetRegs)
3760 MIB.addReg(RetReg, RegState::Implicit);
3764 bool AArch64FastISel::selectTrunc(const Instruction *I) {
3765 Type *DestTy = I->getType();
3766 Value *Op = I->getOperand(0);
3767 Type *SrcTy = Op->getType();
3769 EVT SrcEVT = TLI.getValueType(DL, SrcTy, true);
3770 EVT DestEVT = TLI.getValueType(DL, DestTy, true);
3771 if (!SrcEVT.isSimple())
3773 if (!DestEVT.isSimple())
3776 MVT SrcVT = SrcEVT.getSimpleVT();
3777 MVT DestVT = DestEVT.getSimpleVT();
3779 if (SrcVT != MVT::i64 && SrcVT != MVT::i32 && SrcVT != MVT::i16 &&
3782 if (DestVT != MVT::i32 && DestVT != MVT::i16 && DestVT != MVT::i8 &&
3786 unsigned SrcReg = getRegForValue(Op);
3789 bool SrcIsKill = hasTrivialKill(Op);
3791 // If we're truncating from i64 to a smaller non-legal type then generate an
3792 // AND. Otherwise, we know the high bits are undefined and a truncate only
3793 // generate a COPY. We cannot mark the source register also as result
3794 // register, because this can incorrectly transfer the kill flag onto the
3797 if (SrcVT == MVT::i64) {
3799 switch (DestVT.SimpleTy) {
3801 // Trunc i64 to i32 is handled by the target-independent fast-isel.
3813 // Issue an extract_subreg to get the lower 32-bits.
3814 unsigned Reg32 = fastEmitInst_extractsubreg(MVT::i32, SrcReg, SrcIsKill,
3816 // Create the AND instruction which performs the actual truncation.
3817 ResultReg = emitAnd_ri(MVT::i32, Reg32, /*IsKill=*/true, Mask);
3818 assert(ResultReg && "Unexpected AND instruction emission failure.");
3820 ResultReg = createResultReg(&AArch64::GPR32RegClass);
3821 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3822 TII.get(TargetOpcode::COPY), ResultReg)
3823 .addReg(SrcReg, getKillRegState(SrcIsKill));
3826 updateValueMap(I, ResultReg);
3830 unsigned AArch64FastISel::emiti1Ext(unsigned SrcReg, MVT DestVT, bool IsZExt) {
3831 assert((DestVT == MVT::i8 || DestVT == MVT::i16 || DestVT == MVT::i32 ||
3832 DestVT == MVT::i64) &&
3833 "Unexpected value type.");
3834 // Handle i8 and i16 as i32.
3835 if (DestVT == MVT::i8 || DestVT == MVT::i16)
3839 unsigned ResultReg = emitAnd_ri(MVT::i32, SrcReg, /*TODO:IsKill=*/false, 1);
3840 assert(ResultReg && "Unexpected AND instruction emission failure.");
3841 if (DestVT == MVT::i64) {
3842 // We're ZExt i1 to i64. The ANDWri Wd, Ws, #1 implicitly clears the
3843 // upper 32 bits. Emit a SUBREG_TO_REG to extend from Wd to Xd.
3844 unsigned Reg64 = MRI.createVirtualRegister(&AArch64::GPR64RegClass);
3845 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3846 TII.get(AArch64::SUBREG_TO_REG), Reg64)
3849 .addImm(AArch64::sub_32);
3854 if (DestVT == MVT::i64) {
3855 // FIXME: We're SExt i1 to i64.
3858 return fastEmitInst_rii(AArch64::SBFMWri, &AArch64::GPR32RegClass, SrcReg,
3859 /*TODO:IsKill=*/false, 0, 0);
3863 unsigned AArch64FastISel::emitMul_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
3864 unsigned Op1, bool Op1IsKill) {
3866 switch (RetVT.SimpleTy) {
3872 Opc = AArch64::MADDWrrr; ZReg = AArch64::WZR; break;
3874 Opc = AArch64::MADDXrrr; ZReg = AArch64::XZR; break;
3877 const TargetRegisterClass *RC =
3878 (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
3879 return fastEmitInst_rrr(Opc, RC, Op0, Op0IsKill, Op1, Op1IsKill,
3880 /*IsKill=*/ZReg, true);
3883 unsigned AArch64FastISel::emitSMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
3884 unsigned Op1, bool Op1IsKill) {
3885 if (RetVT != MVT::i64)
3888 return fastEmitInst_rrr(AArch64::SMADDLrrr, &AArch64::GPR64RegClass,
3889 Op0, Op0IsKill, Op1, Op1IsKill,
3890 AArch64::XZR, /*IsKill=*/true);
3893 unsigned AArch64FastISel::emitUMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
3894 unsigned Op1, bool Op1IsKill) {
3895 if (RetVT != MVT::i64)
3898 return fastEmitInst_rrr(AArch64::UMADDLrrr, &AArch64::GPR64RegClass,
3899 Op0, Op0IsKill, Op1, Op1IsKill,
3900 AArch64::XZR, /*IsKill=*/true);
3903 unsigned AArch64FastISel::emitLSL_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
3904 unsigned Op1Reg, bool Op1IsKill) {
3906 bool NeedTrunc = false;
3908 switch (RetVT.SimpleTy) {
3910 case MVT::i8: Opc = AArch64::LSLVWr; NeedTrunc = true; Mask = 0xff; break;
3911 case MVT::i16: Opc = AArch64::LSLVWr; NeedTrunc = true; Mask = 0xffff; break;
3912 case MVT::i32: Opc = AArch64::LSLVWr; break;
3913 case MVT::i64: Opc = AArch64::LSLVXr; break;
3916 const TargetRegisterClass *RC =
3917 (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
3919 Op1Reg = emitAnd_ri(MVT::i32, Op1Reg, Op1IsKill, Mask);
3922 unsigned ResultReg = fastEmitInst_rr(Opc, RC, Op0Reg, Op0IsKill, Op1Reg,
3925 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
3929 unsigned AArch64FastISel::emitLSL_ri(MVT RetVT, MVT SrcVT, unsigned Op0,
3930 bool Op0IsKill, uint64_t Shift,
3932 assert(RetVT.SimpleTy >= SrcVT.SimpleTy &&
3933 "Unexpected source/return type pair.");
3934 assert((SrcVT == MVT::i1 || SrcVT == MVT::i8 || SrcVT == MVT::i16 ||
3935 SrcVT == MVT::i32 || SrcVT == MVT::i64) &&
3936 "Unexpected source value type.");
3937 assert((RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32 ||
3938 RetVT == MVT::i64) && "Unexpected return value type.");
3940 bool Is64Bit = (RetVT == MVT::i64);
3941 unsigned RegSize = Is64Bit ? 64 : 32;
3942 unsigned DstBits = RetVT.getSizeInBits();
3943 unsigned SrcBits = SrcVT.getSizeInBits();
3944 const TargetRegisterClass *RC =
3945 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
3947 // Just emit a copy for "zero" shifts.
3949 if (RetVT == SrcVT) {
3950 unsigned ResultReg = createResultReg(RC);
3951 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3952 TII.get(TargetOpcode::COPY), ResultReg)
3953 .addReg(Op0, getKillRegState(Op0IsKill));
3956 return emitIntExt(SrcVT, Op0, RetVT, IsZExt);
3959 // Don't deal with undefined shifts.
3960 if (Shift >= DstBits)
3963 // For immediate shifts we can fold the zero-/sign-extension into the shift.
3964 // {S|U}BFM Wd, Wn, #r, #s
3965 // Wd<32+s-r,32-r> = Wn<s:0> when r > s
3967 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
3968 // %2 = shl i16 %1, 4
3969 // Wd<32+7-28,32-28> = Wn<7:0> <- clamp s to 7
3970 // 0b1111_1111_1111_1111__1111_1010_1010_0000 sext
3971 // 0b0000_0000_0000_0000__0000_0101_0101_0000 sext | zext
3972 // 0b0000_0000_0000_0000__0000_1010_1010_0000 zext
3974 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
3975 // %2 = shl i16 %1, 8
3976 // Wd<32+7-24,32-24> = Wn<7:0>
3977 // 0b1111_1111_1111_1111__1010_1010_0000_0000 sext
3978 // 0b0000_0000_0000_0000__0101_0101_0000_0000 sext | zext
3979 // 0b0000_0000_0000_0000__1010_1010_0000_0000 zext
3981 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
3982 // %2 = shl i16 %1, 12
3983 // Wd<32+3-20,32-20> = Wn<3:0>
3984 // 0b1111_1111_1111_1111__1010_0000_0000_0000 sext
3985 // 0b0000_0000_0000_0000__0101_0000_0000_0000 sext | zext
3986 // 0b0000_0000_0000_0000__1010_0000_0000_0000 zext
3988 unsigned ImmR = RegSize - Shift;
3989 // Limit the width to the length of the source type.
3990 unsigned ImmS = std::min<unsigned>(SrcBits - 1, DstBits - 1 - Shift);
3991 static const unsigned OpcTable[2][2] = {
3992 {AArch64::SBFMWri, AArch64::SBFMXri},
3993 {AArch64::UBFMWri, AArch64::UBFMXri}
3995 unsigned Opc = OpcTable[IsZExt][Is64Bit];
3996 if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) {
3997 unsigned TmpReg = MRI.createVirtualRegister(RC);
3998 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3999 TII.get(AArch64::SUBREG_TO_REG), TmpReg)
4001 .addReg(Op0, getKillRegState(Op0IsKill))
4002 .addImm(AArch64::sub_32);
4006 return fastEmitInst_rii(Opc, RC, Op0, Op0IsKill, ImmR, ImmS);
4009 unsigned AArch64FastISel::emitLSR_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
4010 unsigned Op1Reg, bool Op1IsKill) {
4012 bool NeedTrunc = false;
4014 switch (RetVT.SimpleTy) {
4016 case MVT::i8: Opc = AArch64::LSRVWr; NeedTrunc = true; Mask = 0xff; break;
4017 case MVT::i16: Opc = AArch64::LSRVWr; NeedTrunc = true; Mask = 0xffff; break;
4018 case MVT::i32: Opc = AArch64::LSRVWr; break;
4019 case MVT::i64: Opc = AArch64::LSRVXr; break;
4022 const TargetRegisterClass *RC =
4023 (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4025 Op0Reg = emitAnd_ri(MVT::i32, Op0Reg, Op0IsKill, Mask);
4026 Op1Reg = emitAnd_ri(MVT::i32, Op1Reg, Op1IsKill, Mask);
4027 Op0IsKill = Op1IsKill = true;
4029 unsigned ResultReg = fastEmitInst_rr(Opc, RC, Op0Reg, Op0IsKill, Op1Reg,
4032 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
4036 unsigned AArch64FastISel::emitLSR_ri(MVT RetVT, MVT SrcVT, unsigned Op0,
4037 bool Op0IsKill, uint64_t Shift,
4039 assert(RetVT.SimpleTy >= SrcVT.SimpleTy &&
4040 "Unexpected source/return type pair.");
4041 assert((SrcVT == MVT::i1 || SrcVT == MVT::i8 || SrcVT == MVT::i16 ||
4042 SrcVT == MVT::i32 || SrcVT == MVT::i64) &&
4043 "Unexpected source value type.");
4044 assert((RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32 ||
4045 RetVT == MVT::i64) && "Unexpected return value type.");
4047 bool Is64Bit = (RetVT == MVT::i64);
4048 unsigned RegSize = Is64Bit ? 64 : 32;
4049 unsigned DstBits = RetVT.getSizeInBits();
4050 unsigned SrcBits = SrcVT.getSizeInBits();
4051 const TargetRegisterClass *RC =
4052 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4054 // Just emit a copy for "zero" shifts.
4056 if (RetVT == SrcVT) {
4057 unsigned ResultReg = createResultReg(RC);
4058 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4059 TII.get(TargetOpcode::COPY), ResultReg)
4060 .addReg(Op0, getKillRegState(Op0IsKill));
4063 return emitIntExt(SrcVT, Op0, RetVT, IsZExt);
4066 // Don't deal with undefined shifts.
4067 if (Shift >= DstBits)
4070 // For immediate shifts we can fold the zero-/sign-extension into the shift.
4071 // {S|U}BFM Wd, Wn, #r, #s
4072 // Wd<s-r:0> = Wn<s:r> when r <= s
4074 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4075 // %2 = lshr i16 %1, 4
4076 // Wd<7-4:0> = Wn<7:4>
4077 // 0b0000_0000_0000_0000__0000_1111_1111_1010 sext
4078 // 0b0000_0000_0000_0000__0000_0000_0000_0101 sext | zext
4079 // 0b0000_0000_0000_0000__0000_0000_0000_1010 zext
4081 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4082 // %2 = lshr i16 %1, 8
4083 // Wd<7-7,0> = Wn<7:7>
4084 // 0b0000_0000_0000_0000__0000_0000_1111_1111 sext
4085 // 0b0000_0000_0000_0000__0000_0000_0000_0000 sext
4086 // 0b0000_0000_0000_0000__0000_0000_0000_0000 zext
4088 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4089 // %2 = lshr i16 %1, 12
4090 // Wd<7-7,0> = Wn<7:7> <- clamp r to 7
4091 // 0b0000_0000_0000_0000__0000_0000_0000_1111 sext
4092 // 0b0000_0000_0000_0000__0000_0000_0000_0000 sext
4093 // 0b0000_0000_0000_0000__0000_0000_0000_0000 zext
4095 if (Shift >= SrcBits && IsZExt)
4096 return materializeInt(ConstantInt::get(*Context, APInt(RegSize, 0)), RetVT);
4098 // It is not possible to fold a sign-extend into the LShr instruction. In this
4099 // case emit a sign-extend.
4101 Op0 = emitIntExt(SrcVT, Op0, RetVT, IsZExt);
4106 SrcBits = SrcVT.getSizeInBits();
4110 unsigned ImmR = std::min<unsigned>(SrcBits - 1, Shift);
4111 unsigned ImmS = SrcBits - 1;
4112 static const unsigned OpcTable[2][2] = {
4113 {AArch64::SBFMWri, AArch64::SBFMXri},
4114 {AArch64::UBFMWri, AArch64::UBFMXri}
4116 unsigned Opc = OpcTable[IsZExt][Is64Bit];
4117 if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) {
4118 unsigned TmpReg = MRI.createVirtualRegister(RC);
4119 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4120 TII.get(AArch64::SUBREG_TO_REG), TmpReg)
4122 .addReg(Op0, getKillRegState(Op0IsKill))
4123 .addImm(AArch64::sub_32);
4127 return fastEmitInst_rii(Opc, RC, Op0, Op0IsKill, ImmR, ImmS);
4130 unsigned AArch64FastISel::emitASR_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
4131 unsigned Op1Reg, bool Op1IsKill) {
4133 bool NeedTrunc = false;
4135 switch (RetVT.SimpleTy) {
4137 case MVT::i8: Opc = AArch64::ASRVWr; NeedTrunc = true; Mask = 0xff; break;
4138 case MVT::i16: Opc = AArch64::ASRVWr; NeedTrunc = true; Mask = 0xffff; break;
4139 case MVT::i32: Opc = AArch64::ASRVWr; break;
4140 case MVT::i64: Opc = AArch64::ASRVXr; break;
4143 const TargetRegisterClass *RC =
4144 (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4146 Op0Reg = emitIntExt(RetVT, Op0Reg, MVT::i32, /*IsZExt=*/false);
4147 Op1Reg = emitAnd_ri(MVT::i32, Op1Reg, Op1IsKill, Mask);
4148 Op0IsKill = Op1IsKill = true;
4150 unsigned ResultReg = fastEmitInst_rr(Opc, RC, Op0Reg, Op0IsKill, Op1Reg,
4153 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
4157 unsigned AArch64FastISel::emitASR_ri(MVT RetVT, MVT SrcVT, unsigned Op0,
4158 bool Op0IsKill, uint64_t Shift,
4160 assert(RetVT.SimpleTy >= SrcVT.SimpleTy &&
4161 "Unexpected source/return type pair.");
4162 assert((SrcVT == MVT::i1 || SrcVT == MVT::i8 || SrcVT == MVT::i16 ||
4163 SrcVT == MVT::i32 || SrcVT == MVT::i64) &&
4164 "Unexpected source value type.");
4165 assert((RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32 ||
4166 RetVT == MVT::i64) && "Unexpected return value type.");
4168 bool Is64Bit = (RetVT == MVT::i64);
4169 unsigned RegSize = Is64Bit ? 64 : 32;
4170 unsigned DstBits = RetVT.getSizeInBits();
4171 unsigned SrcBits = SrcVT.getSizeInBits();
4172 const TargetRegisterClass *RC =
4173 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4175 // Just emit a copy for "zero" shifts.
4177 if (RetVT == SrcVT) {
4178 unsigned ResultReg = createResultReg(RC);
4179 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4180 TII.get(TargetOpcode::COPY), ResultReg)
4181 .addReg(Op0, getKillRegState(Op0IsKill));
4184 return emitIntExt(SrcVT, Op0, RetVT, IsZExt);
4187 // Don't deal with undefined shifts.
4188 if (Shift >= DstBits)
4191 // For immediate shifts we can fold the zero-/sign-extension into the shift.
4192 // {S|U}BFM Wd, Wn, #r, #s
4193 // Wd<s-r:0> = Wn<s:r> when r <= s
4195 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4196 // %2 = ashr i16 %1, 4
4197 // Wd<7-4:0> = Wn<7:4>
4198 // 0b1111_1111_1111_1111__1111_1111_1111_1010 sext
4199 // 0b0000_0000_0000_0000__0000_0000_0000_0101 sext | zext
4200 // 0b0000_0000_0000_0000__0000_0000_0000_1010 zext
4202 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4203 // %2 = ashr i16 %1, 8
4204 // Wd<7-7,0> = Wn<7:7>
4205 // 0b1111_1111_1111_1111__1111_1111_1111_1111 sext
4206 // 0b0000_0000_0000_0000__0000_0000_0000_0000 sext
4207 // 0b0000_0000_0000_0000__0000_0000_0000_0000 zext
4209 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4210 // %2 = ashr i16 %1, 12
4211 // Wd<7-7,0> = Wn<7:7> <- clamp r to 7
4212 // 0b1111_1111_1111_1111__1111_1111_1111_1111 sext
4213 // 0b0000_0000_0000_0000__0000_0000_0000_0000 sext
4214 // 0b0000_0000_0000_0000__0000_0000_0000_0000 zext
4216 if (Shift >= SrcBits && IsZExt)
4217 return materializeInt(ConstantInt::get(*Context, APInt(RegSize, 0)), RetVT);
4219 unsigned ImmR = std::min<unsigned>(SrcBits - 1, Shift);
4220 unsigned ImmS = SrcBits - 1;
4221 static const unsigned OpcTable[2][2] = {
4222 {AArch64::SBFMWri, AArch64::SBFMXri},
4223 {AArch64::UBFMWri, AArch64::UBFMXri}
4225 unsigned Opc = OpcTable[IsZExt][Is64Bit];
4226 if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) {
4227 unsigned TmpReg = MRI.createVirtualRegister(RC);
4228 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4229 TII.get(AArch64::SUBREG_TO_REG), TmpReg)
4231 .addReg(Op0, getKillRegState(Op0IsKill))
4232 .addImm(AArch64::sub_32);
4236 return fastEmitInst_rii(Opc, RC, Op0, Op0IsKill, ImmR, ImmS);
4239 unsigned AArch64FastISel::emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
4241 assert(DestVT != MVT::i1 && "ZeroExt/SignExt an i1?");
4243 // FastISel does not have plumbing to deal with extensions where the SrcVT or
4244 // DestVT are odd things, so test to make sure that they are both types we can
4245 // handle (i1/i8/i16/i32 for SrcVT and i8/i16/i32/i64 for DestVT), otherwise
4246 // bail out to SelectionDAG.
4247 if (((DestVT != MVT::i8) && (DestVT != MVT::i16) &&
4248 (DestVT != MVT::i32) && (DestVT != MVT::i64)) ||
4249 ((SrcVT != MVT::i1) && (SrcVT != MVT::i8) &&
4250 (SrcVT != MVT::i16) && (SrcVT != MVT::i32)))
4256 switch (SrcVT.SimpleTy) {
4260 return emiti1Ext(SrcReg, DestVT, IsZExt);
4262 if (DestVT == MVT::i64)
4263 Opc = IsZExt ? AArch64::UBFMXri : AArch64::SBFMXri;
4265 Opc = IsZExt ? AArch64::UBFMWri : AArch64::SBFMWri;
4269 if (DestVT == MVT::i64)
4270 Opc = IsZExt ? AArch64::UBFMXri : AArch64::SBFMXri;
4272 Opc = IsZExt ? AArch64::UBFMWri : AArch64::SBFMWri;
4276 assert(DestVT == MVT::i64 && "IntExt i32 to i32?!?");
4277 Opc = IsZExt ? AArch64::UBFMXri : AArch64::SBFMXri;
4282 // Handle i8 and i16 as i32.
4283 if (DestVT == MVT::i8 || DestVT == MVT::i16)
4285 else if (DestVT == MVT::i64) {
4286 unsigned Src64 = MRI.createVirtualRegister(&AArch64::GPR64RegClass);
4287 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4288 TII.get(AArch64::SUBREG_TO_REG), Src64)
4291 .addImm(AArch64::sub_32);
4295 const TargetRegisterClass *RC =
4296 (DestVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4297 return fastEmitInst_rii(Opc, RC, SrcReg, /*TODO:IsKill=*/false, 0, Imm);
4300 static bool isZExtLoad(const MachineInstr *LI) {
4301 switch (LI->getOpcode()) {
4304 case AArch64::LDURBBi:
4305 case AArch64::LDURHHi:
4306 case AArch64::LDURWi:
4307 case AArch64::LDRBBui:
4308 case AArch64::LDRHHui:
4309 case AArch64::LDRWui:
4310 case AArch64::LDRBBroX:
4311 case AArch64::LDRHHroX:
4312 case AArch64::LDRWroX:
4313 case AArch64::LDRBBroW:
4314 case AArch64::LDRHHroW:
4315 case AArch64::LDRWroW:
4320 static bool isSExtLoad(const MachineInstr *LI) {
4321 switch (LI->getOpcode()) {
4324 case AArch64::LDURSBWi:
4325 case AArch64::LDURSHWi:
4326 case AArch64::LDURSBXi:
4327 case AArch64::LDURSHXi:
4328 case AArch64::LDURSWi:
4329 case AArch64::LDRSBWui:
4330 case AArch64::LDRSHWui:
4331 case AArch64::LDRSBXui:
4332 case AArch64::LDRSHXui:
4333 case AArch64::LDRSWui:
4334 case AArch64::LDRSBWroX:
4335 case AArch64::LDRSHWroX:
4336 case AArch64::LDRSBXroX:
4337 case AArch64::LDRSHXroX:
4338 case AArch64::LDRSWroX:
4339 case AArch64::LDRSBWroW:
4340 case AArch64::LDRSHWroW:
4341 case AArch64::LDRSBXroW:
4342 case AArch64::LDRSHXroW:
4343 case AArch64::LDRSWroW:
4348 bool AArch64FastISel::optimizeIntExtLoad(const Instruction *I, MVT RetVT,
4350 const auto *LI = dyn_cast<LoadInst>(I->getOperand(0));
4351 if (!LI || !LI->hasOneUse())
4354 // Check if the load instruction has already been selected.
4355 unsigned Reg = lookUpRegForValue(LI);
4359 MachineInstr *MI = MRI.getUniqueVRegDef(Reg);
4363 // Check if the correct load instruction has been emitted - SelectionDAG might
4364 // have emitted a zero-extending load, but we need a sign-extending load.
4365 bool IsZExt = isa<ZExtInst>(I);
4366 const auto *LoadMI = MI;
4367 if (LoadMI->getOpcode() == TargetOpcode::COPY &&
4368 LoadMI->getOperand(1).getSubReg() == AArch64::sub_32) {
4369 unsigned LoadReg = MI->getOperand(1).getReg();
4370 LoadMI = MRI.getUniqueVRegDef(LoadReg);
4371 assert(LoadMI && "Expected valid instruction");
4373 if (!(IsZExt && isZExtLoad(LoadMI)) && !(!IsZExt && isSExtLoad(LoadMI)))
4376 // Nothing to be done.
4377 if (RetVT != MVT::i64 || SrcVT > MVT::i32) {
4378 updateValueMap(I, Reg);
4383 unsigned Reg64 = createResultReg(&AArch64::GPR64RegClass);
4384 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4385 TII.get(AArch64::SUBREG_TO_REG), Reg64)
4387 .addReg(Reg, getKillRegState(true))
4388 .addImm(AArch64::sub_32);
4391 assert((MI->getOpcode() == TargetOpcode::COPY &&
4392 MI->getOperand(1).getSubReg() == AArch64::sub_32) &&
4393 "Expected copy instruction");
4394 Reg = MI->getOperand(1).getReg();
4395 MI->eraseFromParent();
4397 updateValueMap(I, Reg);
4401 bool AArch64FastISel::selectIntExt(const Instruction *I) {
4402 assert((isa<ZExtInst>(I) || isa<SExtInst>(I)) &&
4403 "Unexpected integer extend instruction.");
4406 if (!isTypeSupported(I->getType(), RetVT))
4409 if (!isTypeSupported(I->getOperand(0)->getType(), SrcVT))
4412 // Try to optimize already sign-/zero-extended values from load instructions.
4413 if (optimizeIntExtLoad(I, RetVT, SrcVT))
4416 unsigned SrcReg = getRegForValue(I->getOperand(0));
4419 bool SrcIsKill = hasTrivialKill(I->getOperand(0));
4421 // Try to optimize already sign-/zero-extended values from function arguments.
4422 bool IsZExt = isa<ZExtInst>(I);
4423 if (const auto *Arg = dyn_cast<Argument>(I->getOperand(0))) {
4424 if ((IsZExt && Arg->hasZExtAttr()) || (!IsZExt && Arg->hasSExtAttr())) {
4425 if (RetVT == MVT::i64 && SrcVT != MVT::i64) {
4426 unsigned ResultReg = createResultReg(&AArch64::GPR64RegClass);
4427 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4428 TII.get(AArch64::SUBREG_TO_REG), ResultReg)
4430 .addReg(SrcReg, getKillRegState(SrcIsKill))
4431 .addImm(AArch64::sub_32);
4434 // Conservatively clear all kill flags from all uses, because we are
4435 // replacing a sign-/zero-extend instruction at IR level with a nop at MI
4436 // level. The result of the instruction at IR level might have been
4437 // trivially dead, which is now not longer true.
4438 unsigned UseReg = lookUpRegForValue(I);
4440 MRI.clearKillFlags(UseReg);
4442 updateValueMap(I, SrcReg);
4447 unsigned ResultReg = emitIntExt(SrcVT, SrcReg, RetVT, IsZExt);
4451 updateValueMap(I, ResultReg);
4455 bool AArch64FastISel::selectRem(const Instruction *I, unsigned ISDOpcode) {
4456 EVT DestEVT = TLI.getValueType(DL, I->getType(), true);
4457 if (!DestEVT.isSimple())
4460 MVT DestVT = DestEVT.getSimpleVT();
4461 if (DestVT != MVT::i64 && DestVT != MVT::i32)
4465 bool Is64bit = (DestVT == MVT::i64);
4466 switch (ISDOpcode) {
4470 DivOpc = Is64bit ? AArch64::SDIVXr : AArch64::SDIVWr;
4473 DivOpc = Is64bit ? AArch64::UDIVXr : AArch64::UDIVWr;
4476 unsigned MSubOpc = Is64bit ? AArch64::MSUBXrrr : AArch64::MSUBWrrr;
4477 unsigned Src0Reg = getRegForValue(I->getOperand(0));
4480 bool Src0IsKill = hasTrivialKill(I->getOperand(0));
4482 unsigned Src1Reg = getRegForValue(I->getOperand(1));
4485 bool Src1IsKill = hasTrivialKill(I->getOperand(1));
4487 const TargetRegisterClass *RC =
4488 (DestVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4489 unsigned QuotReg = fastEmitInst_rr(DivOpc, RC, Src0Reg, /*IsKill=*/false,
4490 Src1Reg, /*IsKill=*/false);
4491 assert(QuotReg && "Unexpected DIV instruction emission failure.");
4492 // The remainder is computed as numerator - (quotient * denominator) using the
4493 // MSUB instruction.
4494 unsigned ResultReg = fastEmitInst_rrr(MSubOpc, RC, QuotReg, /*IsKill=*/true,
4495 Src1Reg, Src1IsKill, Src0Reg,
4497 updateValueMap(I, ResultReg);
4501 bool AArch64FastISel::selectMul(const Instruction *I) {
4503 if (!isTypeSupported(I->getType(), VT, /*IsVectorAllowed=*/true))
4507 return selectBinaryOp(I, ISD::MUL);
4509 const Value *Src0 = I->getOperand(0);
4510 const Value *Src1 = I->getOperand(1);
4511 if (const auto *C = dyn_cast<ConstantInt>(Src0))
4512 if (C->getValue().isPowerOf2())
4513 std::swap(Src0, Src1);
4515 // Try to simplify to a shift instruction.
4516 if (const auto *C = dyn_cast<ConstantInt>(Src1))
4517 if (C->getValue().isPowerOf2()) {
4518 uint64_t ShiftVal = C->getValue().logBase2();
4521 if (const auto *ZExt = dyn_cast<ZExtInst>(Src0)) {
4522 if (!isIntExtFree(ZExt)) {
4524 if (isValueAvailable(ZExt) && isTypeSupported(ZExt->getSrcTy(), VT)) {
4527 Src0 = ZExt->getOperand(0);
4530 } else if (const auto *SExt = dyn_cast<SExtInst>(Src0)) {
4531 if (!isIntExtFree(SExt)) {
4533 if (isValueAvailable(SExt) && isTypeSupported(SExt->getSrcTy(), VT)) {
4536 Src0 = SExt->getOperand(0);
4541 unsigned Src0Reg = getRegForValue(Src0);
4544 bool Src0IsKill = hasTrivialKill(Src0);
4546 unsigned ResultReg =
4547 emitLSL_ri(VT, SrcVT, Src0Reg, Src0IsKill, ShiftVal, IsZExt);
4550 updateValueMap(I, ResultReg);
4555 unsigned Src0Reg = getRegForValue(I->getOperand(0));
4558 bool Src0IsKill = hasTrivialKill(I->getOperand(0));
4560 unsigned Src1Reg = getRegForValue(I->getOperand(1));
4563 bool Src1IsKill = hasTrivialKill(I->getOperand(1));
4565 unsigned ResultReg = emitMul_rr(VT, Src0Reg, Src0IsKill, Src1Reg, Src1IsKill);
4570 updateValueMap(I, ResultReg);
4574 bool AArch64FastISel::selectShift(const Instruction *I) {
4576 if (!isTypeSupported(I->getType(), RetVT, /*IsVectorAllowed=*/true))
4579 if (RetVT.isVector())
4580 return selectOperator(I, I->getOpcode());
4582 if (const auto *C = dyn_cast<ConstantInt>(I->getOperand(1))) {
4583 unsigned ResultReg = 0;
4584 uint64_t ShiftVal = C->getZExtValue();
4586 bool IsZExt = I->getOpcode() != Instruction::AShr;
4587 const Value *Op0 = I->getOperand(0);
4588 if (const auto *ZExt = dyn_cast<ZExtInst>(Op0)) {
4589 if (!isIntExtFree(ZExt)) {
4591 if (isValueAvailable(ZExt) && isTypeSupported(ZExt->getSrcTy(), TmpVT)) {
4594 Op0 = ZExt->getOperand(0);
4597 } else if (const auto *SExt = dyn_cast<SExtInst>(Op0)) {
4598 if (!isIntExtFree(SExt)) {
4600 if (isValueAvailable(SExt) && isTypeSupported(SExt->getSrcTy(), TmpVT)) {
4603 Op0 = SExt->getOperand(0);
4608 unsigned Op0Reg = getRegForValue(Op0);
4611 bool Op0IsKill = hasTrivialKill(Op0);
4613 switch (I->getOpcode()) {
4614 default: llvm_unreachable("Unexpected instruction.");
4615 case Instruction::Shl:
4616 ResultReg = emitLSL_ri(RetVT, SrcVT, Op0Reg, Op0IsKill, ShiftVal, IsZExt);
4618 case Instruction::AShr:
4619 ResultReg = emitASR_ri(RetVT, SrcVT, Op0Reg, Op0IsKill, ShiftVal, IsZExt);
4621 case Instruction::LShr:
4622 ResultReg = emitLSR_ri(RetVT, SrcVT, Op0Reg, Op0IsKill, ShiftVal, IsZExt);
4628 updateValueMap(I, ResultReg);
4632 unsigned Op0Reg = getRegForValue(I->getOperand(0));
4635 bool Op0IsKill = hasTrivialKill(I->getOperand(0));
4637 unsigned Op1Reg = getRegForValue(I->getOperand(1));
4640 bool Op1IsKill = hasTrivialKill(I->getOperand(1));
4642 unsigned ResultReg = 0;
4643 switch (I->getOpcode()) {
4644 default: llvm_unreachable("Unexpected instruction.");
4645 case Instruction::Shl:
4646 ResultReg = emitLSL_rr(RetVT, Op0Reg, Op0IsKill, Op1Reg, Op1IsKill);
4648 case Instruction::AShr:
4649 ResultReg = emitASR_rr(RetVT, Op0Reg, Op0IsKill, Op1Reg, Op1IsKill);
4651 case Instruction::LShr:
4652 ResultReg = emitLSR_rr(RetVT, Op0Reg, Op0IsKill, Op1Reg, Op1IsKill);
4659 updateValueMap(I, ResultReg);
4663 bool AArch64FastISel::selectBitCast(const Instruction *I) {
4666 if (!isTypeLegal(I->getOperand(0)->getType(), SrcVT))
4668 if (!isTypeLegal(I->getType(), RetVT))
4672 if (RetVT == MVT::f32 && SrcVT == MVT::i32)
4673 Opc = AArch64::FMOVWSr;
4674 else if (RetVT == MVT::f64 && SrcVT == MVT::i64)
4675 Opc = AArch64::FMOVXDr;
4676 else if (RetVT == MVT::i32 && SrcVT == MVT::f32)
4677 Opc = AArch64::FMOVSWr;
4678 else if (RetVT == MVT::i64 && SrcVT == MVT::f64)
4679 Opc = AArch64::FMOVDXr;
4683 const TargetRegisterClass *RC = nullptr;
4684 switch (RetVT.SimpleTy) {
4685 default: llvm_unreachable("Unexpected value type.");
4686 case MVT::i32: RC = &AArch64::GPR32RegClass; break;
4687 case MVT::i64: RC = &AArch64::GPR64RegClass; break;
4688 case MVT::f32: RC = &AArch64::FPR32RegClass; break;
4689 case MVT::f64: RC = &AArch64::FPR64RegClass; break;
4691 unsigned Op0Reg = getRegForValue(I->getOperand(0));
4694 bool Op0IsKill = hasTrivialKill(I->getOperand(0));
4695 unsigned ResultReg = fastEmitInst_r(Opc, RC, Op0Reg, Op0IsKill);
4700 updateValueMap(I, ResultReg);
4704 bool AArch64FastISel::selectFRem(const Instruction *I) {
4706 if (!isTypeLegal(I->getType(), RetVT))
4710 switch (RetVT.SimpleTy) {
4714 LC = RTLIB::REM_F32;
4717 LC = RTLIB::REM_F64;
4722 Args.reserve(I->getNumOperands());
4724 // Populate the argument list.
4725 for (auto &Arg : I->operands()) {
4728 Entry.Ty = Arg->getType();
4729 Args.push_back(Entry);
4732 CallLoweringInfo CLI;
4733 MCContext &Ctx = MF->getContext();
4734 CLI.setCallee(DL, Ctx, TLI.getLibcallCallingConv(LC), I->getType(),
4735 TLI.getLibcallName(LC), std::move(Args));
4736 if (!lowerCallTo(CLI))
4738 updateValueMap(I, CLI.ResultReg);
4742 bool AArch64FastISel::selectSDiv(const Instruction *I) {
4744 if (!isTypeLegal(I->getType(), VT))
4747 if (!isa<ConstantInt>(I->getOperand(1)))
4748 return selectBinaryOp(I, ISD::SDIV);
4750 const APInt &C = cast<ConstantInt>(I->getOperand(1))->getValue();
4751 if ((VT != MVT::i32 && VT != MVT::i64) || !C ||
4752 !(C.isPowerOf2() || (-C).isPowerOf2()))
4753 return selectBinaryOp(I, ISD::SDIV);
4755 unsigned Lg2 = C.countTrailingZeros();
4756 unsigned Src0Reg = getRegForValue(I->getOperand(0));
4759 bool Src0IsKill = hasTrivialKill(I->getOperand(0));
4761 if (cast<BinaryOperator>(I)->isExact()) {
4762 unsigned ResultReg = emitASR_ri(VT, VT, Src0Reg, Src0IsKill, Lg2);
4765 updateValueMap(I, ResultReg);
4769 int64_t Pow2MinusOne = (1ULL << Lg2) - 1;
4770 unsigned AddReg = emitAdd_ri_(VT, Src0Reg, /*IsKill=*/false, Pow2MinusOne);
4774 // (Src0 < 0) ? Pow2 - 1 : 0;
4775 if (!emitICmp_ri(VT, Src0Reg, /*IsKill=*/false, 0))
4779 const TargetRegisterClass *RC;
4780 if (VT == MVT::i64) {
4781 SelectOpc = AArch64::CSELXr;
4782 RC = &AArch64::GPR64RegClass;
4784 SelectOpc = AArch64::CSELWr;
4785 RC = &AArch64::GPR32RegClass;
4787 unsigned SelectReg =
4788 fastEmitInst_rri(SelectOpc, RC, AddReg, /*IsKill=*/true, Src0Reg,
4789 Src0IsKill, AArch64CC::LT);
4793 // Divide by Pow2 --> ashr. If we're dividing by a negative value we must also
4794 // negate the result.
4795 unsigned ZeroReg = (VT == MVT::i64) ? AArch64::XZR : AArch64::WZR;
4798 ResultReg = emitAddSub_rs(/*UseAdd=*/false, VT, ZeroReg, /*IsKill=*/true,
4799 SelectReg, /*IsKill=*/true, AArch64_AM::ASR, Lg2);
4801 ResultReg = emitASR_ri(VT, VT, SelectReg, /*IsKill=*/true, Lg2);
4806 updateValueMap(I, ResultReg);
4810 /// This is mostly a copy of the existing FastISel getRegForGEPIndex code. We
4811 /// have to duplicate it for AArch64, because otherwise we would fail during the
4812 /// sign-extend emission.
4813 std::pair<unsigned, bool> AArch64FastISel::getRegForGEPIndex(const Value *Idx) {
4814 unsigned IdxN = getRegForValue(Idx);
4816 // Unhandled operand. Halt "fast" selection and bail.
4817 return std::pair<unsigned, bool>(0, false);
4819 bool IdxNIsKill = hasTrivialKill(Idx);
4821 // If the index is smaller or larger than intptr_t, truncate or extend it.
4822 MVT PtrVT = TLI.getPointerTy(DL);
4823 EVT IdxVT = EVT::getEVT(Idx->getType(), /*HandleUnknown=*/false);
4824 if (IdxVT.bitsLT(PtrVT)) {
4825 IdxN = emitIntExt(IdxVT.getSimpleVT(), IdxN, PtrVT, /*IsZExt=*/false);
4827 } else if (IdxVT.bitsGT(PtrVT))
4828 llvm_unreachable("AArch64 FastISel doesn't support types larger than i64");
4829 return std::pair<unsigned, bool>(IdxN, IdxNIsKill);
4832 /// This is mostly a copy of the existing FastISel GEP code, but we have to
4833 /// duplicate it for AArch64, because otherwise we would bail out even for
4834 /// simple cases. This is because the standard fastEmit functions don't cover
4835 /// MUL at all and ADD is lowered very inefficientily.
4836 bool AArch64FastISel::selectGetElementPtr(const Instruction *I) {
4837 unsigned N = getRegForValue(I->getOperand(0));
4840 bool NIsKill = hasTrivialKill(I->getOperand(0));
4842 // Keep a running tab of the total offset to coalesce multiple N = N + Offset
4843 // into a single N = N + TotalOffset.
4844 uint64_t TotalOffs = 0;
4845 Type *Ty = I->getOperand(0)->getType();
4846 MVT VT = TLI.getPointerTy(DL);
4847 for (auto OI = std::next(I->op_begin()), E = I->op_end(); OI != E; ++OI) {
4848 const Value *Idx = *OI;
4849 if (auto *StTy = dyn_cast<StructType>(Ty)) {
4850 unsigned Field = cast<ConstantInt>(Idx)->getZExtValue();
4853 TotalOffs += DL.getStructLayout(StTy)->getElementOffset(Field);
4854 Ty = StTy->getElementType(Field);
4856 Ty = cast<SequentialType>(Ty)->getElementType();
4857 // If this is a constant subscript, handle it quickly.
4858 if (const auto *CI = dyn_cast<ConstantInt>(Idx)) {
4863 DL.getTypeAllocSize(Ty) * cast<ConstantInt>(CI)->getSExtValue();
4867 N = emitAdd_ri_(VT, N, NIsKill, TotalOffs);
4874 // N = N + Idx * ElementSize;
4875 uint64_t ElementSize = DL.getTypeAllocSize(Ty);
4876 std::pair<unsigned, bool> Pair = getRegForGEPIndex(Idx);
4877 unsigned IdxN = Pair.first;
4878 bool IdxNIsKill = Pair.second;
4882 if (ElementSize != 1) {
4883 unsigned C = fastEmit_i(VT, VT, ISD::Constant, ElementSize);
4886 IdxN = emitMul_rr(VT, IdxN, IdxNIsKill, C, true);
4891 N = fastEmit_rr(VT, VT, ISD::ADD, N, NIsKill, IdxN, IdxNIsKill);
4897 N = emitAdd_ri_(VT, N, NIsKill, TotalOffs);
4901 updateValueMap(I, N);
4905 bool AArch64FastISel::fastSelectInstruction(const Instruction *I) {
4906 switch (I->getOpcode()) {
4909 case Instruction::Add:
4910 case Instruction::Sub:
4911 return selectAddSub(I);
4912 case Instruction::Mul:
4913 return selectMul(I);
4914 case Instruction::SDiv:
4915 return selectSDiv(I);
4916 case Instruction::SRem:
4917 if (!selectBinaryOp(I, ISD::SREM))
4918 return selectRem(I, ISD::SREM);
4920 case Instruction::URem:
4921 if (!selectBinaryOp(I, ISD::UREM))
4922 return selectRem(I, ISD::UREM);
4924 case Instruction::Shl:
4925 case Instruction::LShr:
4926 case Instruction::AShr:
4927 return selectShift(I);
4928 case Instruction::And:
4929 case Instruction::Or:
4930 case Instruction::Xor:
4931 return selectLogicalOp(I);
4932 case Instruction::Br:
4933 return selectBranch(I);
4934 case Instruction::IndirectBr:
4935 return selectIndirectBr(I);
4936 case Instruction::BitCast:
4937 if (!FastISel::selectBitCast(I))
4938 return selectBitCast(I);
4940 case Instruction::FPToSI:
4941 if (!selectCast(I, ISD::FP_TO_SINT))
4942 return selectFPToInt(I, /*Signed=*/true);
4944 case Instruction::FPToUI:
4945 return selectFPToInt(I, /*Signed=*/false);
4946 case Instruction::ZExt:
4947 case Instruction::SExt:
4948 return selectIntExt(I);
4949 case Instruction::Trunc:
4950 if (!selectCast(I, ISD::TRUNCATE))
4951 return selectTrunc(I);
4953 case Instruction::FPExt:
4954 return selectFPExt(I);
4955 case Instruction::FPTrunc:
4956 return selectFPTrunc(I);
4957 case Instruction::SIToFP:
4958 if (!selectCast(I, ISD::SINT_TO_FP))
4959 return selectIntToFP(I, /*Signed=*/true);
4961 case Instruction::UIToFP:
4962 return selectIntToFP(I, /*Signed=*/false);
4963 case Instruction::Load:
4964 return selectLoad(I);
4965 case Instruction::Store:
4966 return selectStore(I);
4967 case Instruction::FCmp:
4968 case Instruction::ICmp:
4969 return selectCmp(I);
4970 case Instruction::Select:
4971 return selectSelect(I);
4972 case Instruction::Ret:
4973 return selectRet(I);
4974 case Instruction::FRem:
4975 return selectFRem(I);
4976 case Instruction::GetElementPtr:
4977 return selectGetElementPtr(I);
4980 // fall-back to target-independent instruction selection.
4981 return selectOperator(I, I->getOpcode());
4982 // Silence warnings.
4983 (void)&CC_AArch64_DarwinPCS_VarArg;
4987 llvm::FastISel *AArch64::createFastISel(FunctionLoweringInfo &FuncInfo,
4988 const TargetLibraryInfo *LibInfo) {
4989 return new AArch64FastISel(FuncInfo, LibInfo);