1 //===- AArch6464FastISel.cpp - AArch64 FastISel implementation ------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file defines the AArch64-specific support for the FastISel class. Some
10 // of the target-specific code is generated by tablegen in the file
11 // AArch64GenFastISel.inc, which is #included here.
13 //===----------------------------------------------------------------------===//
16 #include "AArch64CallingConvention.h"
17 #include "AArch64RegisterInfo.h"
18 #include "AArch64Subtarget.h"
19 #include "MCTargetDesc/AArch64AddressingModes.h"
20 #include "Utils/AArch64BaseInfo.h"
21 #include "llvm/ADT/APFloat.h"
22 #include "llvm/ADT/APInt.h"
23 #include "llvm/ADT/DenseMap.h"
24 #include "llvm/ADT/SmallVector.h"
25 #include "llvm/Analysis/BranchProbabilityInfo.h"
26 #include "llvm/CodeGen/CallingConvLower.h"
27 #include "llvm/CodeGen/FastISel.h"
28 #include "llvm/CodeGen/FunctionLoweringInfo.h"
29 #include "llvm/CodeGen/ISDOpcodes.h"
30 #include "llvm/CodeGen/MachineBasicBlock.h"
31 #include "llvm/CodeGen/MachineConstantPool.h"
32 #include "llvm/CodeGen/MachineFrameInfo.h"
33 #include "llvm/CodeGen/MachineInstr.h"
34 #include "llvm/CodeGen/MachineInstrBuilder.h"
35 #include "llvm/CodeGen/MachineMemOperand.h"
36 #include "llvm/CodeGen/MachineRegisterInfo.h"
37 #include "llvm/CodeGen/RuntimeLibcalls.h"
38 #include "llvm/CodeGen/ValueTypes.h"
39 #include "llvm/IR/Argument.h"
40 #include "llvm/IR/Attributes.h"
41 #include "llvm/IR/BasicBlock.h"
42 #include "llvm/IR/CallingConv.h"
43 #include "llvm/IR/Constant.h"
44 #include "llvm/IR/Constants.h"
45 #include "llvm/IR/DataLayout.h"
46 #include "llvm/IR/DerivedTypes.h"
47 #include "llvm/IR/Function.h"
48 #include "llvm/IR/GetElementPtrTypeIterator.h"
49 #include "llvm/IR/GlobalValue.h"
50 #include "llvm/IR/InstrTypes.h"
51 #include "llvm/IR/Instruction.h"
52 #include "llvm/IR/Instructions.h"
53 #include "llvm/IR/IntrinsicInst.h"
54 #include "llvm/IR/Intrinsics.h"
55 #include "llvm/IR/Operator.h"
56 #include "llvm/IR/Type.h"
57 #include "llvm/IR/User.h"
58 #include "llvm/IR/Value.h"
59 #include "llvm/MC/MCInstrDesc.h"
60 #include "llvm/MC/MCRegisterInfo.h"
61 #include "llvm/MC/MCSymbol.h"
62 #include "llvm/Support/AtomicOrdering.h"
63 #include "llvm/Support/Casting.h"
64 #include "llvm/Support/CodeGen.h"
65 #include "llvm/Support/Compiler.h"
66 #include "llvm/Support/ErrorHandling.h"
67 #include "llvm/Support/MachineValueType.h"
68 #include "llvm/Support/MathExtras.h"
79 class AArch64FastISel final : public FastISel {
82 using BaseKind = enum {
88 BaseKind Kind = RegBase;
89 AArch64_AM::ShiftExtendType ExtType = AArch64_AM::InvalidShiftExtend;
94 unsigned OffsetReg = 0;
97 const GlobalValue *GV = nullptr;
100 Address() { Base.Reg = 0; }
102 void setKind(BaseKind K) { Kind = K; }
103 BaseKind getKind() const { return Kind; }
104 void setExtendType(AArch64_AM::ShiftExtendType E) { ExtType = E; }
105 AArch64_AM::ShiftExtendType getExtendType() const { return ExtType; }
106 bool isRegBase() const { return Kind == RegBase; }
107 bool isFIBase() const { return Kind == FrameIndexBase; }
109 void setReg(unsigned Reg) {
110 assert(isRegBase() && "Invalid base register access!");
114 unsigned getReg() const {
115 assert(isRegBase() && "Invalid base register access!");
119 void setOffsetReg(unsigned Reg) {
123 unsigned getOffsetReg() const {
127 void setFI(unsigned FI) {
128 assert(isFIBase() && "Invalid base frame index access!");
132 unsigned getFI() const {
133 assert(isFIBase() && "Invalid base frame index access!");
137 void setOffset(int64_t O) { Offset = O; }
138 int64_t getOffset() { return Offset; }
139 void setShift(unsigned S) { Shift = S; }
140 unsigned getShift() { return Shift; }
142 void setGlobalValue(const GlobalValue *G) { GV = G; }
143 const GlobalValue *getGlobalValue() { return GV; }
146 /// Subtarget - Keep a pointer to the AArch64Subtarget around so that we can
147 /// make the right decision when generating code for different targets.
148 const AArch64Subtarget *Subtarget;
149 LLVMContext *Context;
151 bool fastLowerArguments() override;
152 bool fastLowerCall(CallLoweringInfo &CLI) override;
153 bool fastLowerIntrinsicCall(const IntrinsicInst *II) override;
156 // Selection routines.
157 bool selectAddSub(const Instruction *I);
158 bool selectLogicalOp(const Instruction *I);
159 bool selectLoad(const Instruction *I);
160 bool selectStore(const Instruction *I);
161 bool selectBranch(const Instruction *I);
162 bool selectIndirectBr(const Instruction *I);
163 bool selectCmp(const Instruction *I);
164 bool selectSelect(const Instruction *I);
165 bool selectFPExt(const Instruction *I);
166 bool selectFPTrunc(const Instruction *I);
167 bool selectFPToInt(const Instruction *I, bool Signed);
168 bool selectIntToFP(const Instruction *I, bool Signed);
169 bool selectRem(const Instruction *I, unsigned ISDOpcode);
170 bool selectRet(const Instruction *I);
171 bool selectTrunc(const Instruction *I);
172 bool selectIntExt(const Instruction *I);
173 bool selectMul(const Instruction *I);
174 bool selectShift(const Instruction *I);
175 bool selectBitCast(const Instruction *I);
176 bool selectFRem(const Instruction *I);
177 bool selectSDiv(const Instruction *I);
178 bool selectGetElementPtr(const Instruction *I);
179 bool selectAtomicCmpXchg(const AtomicCmpXchgInst *I);
181 // Utility helper routines.
182 bool isTypeLegal(Type *Ty, MVT &VT);
183 bool isTypeSupported(Type *Ty, MVT &VT, bool IsVectorAllowed = false);
184 bool isValueAvailable(const Value *V) const;
185 bool computeAddress(const Value *Obj, Address &Addr, Type *Ty = nullptr);
186 bool computeCallAddress(const Value *V, Address &Addr);
187 bool simplifyAddress(Address &Addr, MVT VT);
188 void addLoadStoreOperands(Address &Addr, const MachineInstrBuilder &MIB,
189 MachineMemOperand::Flags Flags,
190 unsigned ScaleFactor, MachineMemOperand *MMO);
191 bool isMemCpySmall(uint64_t Len, unsigned Alignment);
192 bool tryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len,
194 bool foldXALUIntrinsic(AArch64CC::CondCode &CC, const Instruction *I,
196 bool optimizeIntExtLoad(const Instruction *I, MVT RetVT, MVT SrcVT);
197 bool optimizeSelect(const SelectInst *SI);
198 std::pair<unsigned, bool> getRegForGEPIndex(const Value *Idx);
200 // Emit helper routines.
201 unsigned emitAddSub(bool UseAdd, MVT RetVT, const Value *LHS,
202 const Value *RHS, bool SetFlags = false,
203 bool WantResult = true, bool IsZExt = false);
204 unsigned emitAddSub_rr(bool UseAdd, MVT RetVT, unsigned LHSReg,
205 bool LHSIsKill, unsigned RHSReg, bool RHSIsKill,
206 bool SetFlags = false, bool WantResult = true);
207 unsigned emitAddSub_ri(bool UseAdd, MVT RetVT, unsigned LHSReg,
208 bool LHSIsKill, uint64_t Imm, bool SetFlags = false,
209 bool WantResult = true);
210 unsigned emitAddSub_rs(bool UseAdd, MVT RetVT, unsigned LHSReg,
211 bool LHSIsKill, unsigned RHSReg, bool RHSIsKill,
212 AArch64_AM::ShiftExtendType ShiftType,
213 uint64_t ShiftImm, bool SetFlags = false,
214 bool WantResult = true);
215 unsigned emitAddSub_rx(bool UseAdd, MVT RetVT, unsigned LHSReg,
216 bool LHSIsKill, unsigned RHSReg, bool RHSIsKill,
217 AArch64_AM::ShiftExtendType ExtType,
218 uint64_t ShiftImm, bool SetFlags = false,
219 bool WantResult = true);
222 bool emitCompareAndBranch(const BranchInst *BI);
223 bool emitCmp(const Value *LHS, const Value *RHS, bool IsZExt);
224 bool emitICmp(MVT RetVT, const Value *LHS, const Value *RHS, bool IsZExt);
225 bool emitICmp_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill, uint64_t Imm);
226 bool emitFCmp(MVT RetVT, const Value *LHS, const Value *RHS);
227 unsigned emitLoad(MVT VT, MVT ResultVT, Address Addr, bool WantZExt = true,
228 MachineMemOperand *MMO = nullptr);
229 bool emitStore(MVT VT, unsigned SrcReg, Address Addr,
230 MachineMemOperand *MMO = nullptr);
231 bool emitStoreRelease(MVT VT, unsigned SrcReg, unsigned AddrReg,
232 MachineMemOperand *MMO = nullptr);
233 unsigned emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT, bool isZExt);
234 unsigned emiti1Ext(unsigned SrcReg, MVT DestVT, bool isZExt);
235 unsigned emitAdd(MVT RetVT, const Value *LHS, const Value *RHS,
236 bool SetFlags = false, bool WantResult = true,
237 bool IsZExt = false);
238 unsigned emitAdd_ri_(MVT VT, unsigned Op0, bool Op0IsKill, int64_t Imm);
239 unsigned emitSub(MVT RetVT, const Value *LHS, const Value *RHS,
240 bool SetFlags = false, bool WantResult = true,
241 bool IsZExt = false);
242 unsigned emitSubs_rr(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
243 unsigned RHSReg, bool RHSIsKill, bool WantResult = true);
244 unsigned emitSubs_rs(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
245 unsigned RHSReg, bool RHSIsKill,
246 AArch64_AM::ShiftExtendType ShiftType, uint64_t ShiftImm,
247 bool WantResult = true);
248 unsigned emitLogicalOp(unsigned ISDOpc, MVT RetVT, const Value *LHS,
250 unsigned emitLogicalOp_ri(unsigned ISDOpc, MVT RetVT, unsigned LHSReg,
251 bool LHSIsKill, uint64_t Imm);
252 unsigned emitLogicalOp_rs(unsigned ISDOpc, MVT RetVT, unsigned LHSReg,
253 bool LHSIsKill, unsigned RHSReg, bool RHSIsKill,
255 unsigned emitAnd_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill, uint64_t Imm);
256 unsigned emitMul_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
257 unsigned Op1, bool Op1IsKill);
258 unsigned emitSMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
259 unsigned Op1, bool Op1IsKill);
260 unsigned emitUMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
261 unsigned Op1, bool Op1IsKill);
262 unsigned emitLSL_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
263 unsigned Op1Reg, bool Op1IsKill);
264 unsigned emitLSL_ri(MVT RetVT, MVT SrcVT, unsigned Op0Reg, bool Op0IsKill,
265 uint64_t Imm, bool IsZExt = true);
266 unsigned emitLSR_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
267 unsigned Op1Reg, bool Op1IsKill);
268 unsigned emitLSR_ri(MVT RetVT, MVT SrcVT, unsigned Op0Reg, bool Op0IsKill,
269 uint64_t Imm, bool IsZExt = true);
270 unsigned emitASR_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
271 unsigned Op1Reg, bool Op1IsKill);
272 unsigned emitASR_ri(MVT RetVT, MVT SrcVT, unsigned Op0Reg, bool Op0IsKill,
273 uint64_t Imm, bool IsZExt = false);
275 unsigned materializeInt(const ConstantInt *CI, MVT VT);
276 unsigned materializeFP(const ConstantFP *CFP, MVT VT);
277 unsigned materializeGV(const GlobalValue *GV);
279 // Call handling routines.
281 CCAssignFn *CCAssignFnForCall(CallingConv::ID CC) const;
282 bool processCallArgs(CallLoweringInfo &CLI, SmallVectorImpl<MVT> &ArgVTs,
284 bool finishCall(CallLoweringInfo &CLI, MVT RetVT, unsigned NumBytes);
287 // Backend specific FastISel code.
288 unsigned fastMaterializeAlloca(const AllocaInst *AI) override;
289 unsigned fastMaterializeConstant(const Constant *C) override;
290 unsigned fastMaterializeFloatZero(const ConstantFP* CF) override;
292 explicit AArch64FastISel(FunctionLoweringInfo &FuncInfo,
293 const TargetLibraryInfo *LibInfo)
294 : FastISel(FuncInfo, LibInfo, /*SkipTargetIndependentISel=*/true) {
296 &static_cast<const AArch64Subtarget &>(FuncInfo.MF->getSubtarget());
297 Context = &FuncInfo.Fn->getContext();
300 bool fastSelectInstruction(const Instruction *I) override;
302 #include "AArch64GenFastISel.inc"
305 } // end anonymous namespace
307 /// Check if the sign-/zero-extend will be a noop.
308 static bool isIntExtFree(const Instruction *I) {
309 assert((isa<ZExtInst>(I) || isa<SExtInst>(I)) &&
310 "Unexpected integer extend instruction.");
311 assert(!I->getType()->isVectorTy() && I->getType()->isIntegerTy() &&
312 "Unexpected value type.");
313 bool IsZExt = isa<ZExtInst>(I);
315 if (const auto *LI = dyn_cast<LoadInst>(I->getOperand(0)))
319 if (const auto *Arg = dyn_cast<Argument>(I->getOperand(0)))
320 if ((IsZExt && Arg->hasZExtAttr()) || (!IsZExt && Arg->hasSExtAttr()))
326 /// Determine the implicit scale factor that is applied by a memory
327 /// operation for a given value type.
328 static unsigned getImplicitScaleFactor(MVT VT) {
329 switch (VT.SimpleTy) {
332 case MVT::i1: // fall-through
337 case MVT::i32: // fall-through
340 case MVT::i64: // fall-through
346 CCAssignFn *AArch64FastISel::CCAssignFnForCall(CallingConv::ID CC) const {
347 if (CC == CallingConv::WebKit_JS)
348 return CC_AArch64_WebKit_JS;
349 if (CC == CallingConv::GHC)
350 return CC_AArch64_GHC;
351 return Subtarget->isTargetDarwin() ? CC_AArch64_DarwinPCS : CC_AArch64_AAPCS;
354 unsigned AArch64FastISel::fastMaterializeAlloca(const AllocaInst *AI) {
355 assert(TLI.getValueType(DL, AI->getType(), true) == MVT::i64 &&
356 "Alloca should always return a pointer.");
358 // Don't handle dynamic allocas.
359 if (!FuncInfo.StaticAllocaMap.count(AI))
362 DenseMap<const AllocaInst *, int>::iterator SI =
363 FuncInfo.StaticAllocaMap.find(AI);
365 if (SI != FuncInfo.StaticAllocaMap.end()) {
366 unsigned ResultReg = createResultReg(&AArch64::GPR64spRegClass);
367 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADDXri),
369 .addFrameIndex(SI->second)
378 unsigned AArch64FastISel::materializeInt(const ConstantInt *CI, MVT VT) {
383 return fastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
385 // Create a copy from the zero register to materialize a "0" value.
386 const TargetRegisterClass *RC = (VT == MVT::i64) ? &AArch64::GPR64RegClass
387 : &AArch64::GPR32RegClass;
388 unsigned ZeroReg = (VT == MVT::i64) ? AArch64::XZR : AArch64::WZR;
389 unsigned ResultReg = createResultReg(RC);
390 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(TargetOpcode::COPY),
391 ResultReg).addReg(ZeroReg, getKillRegState(true));
395 unsigned AArch64FastISel::materializeFP(const ConstantFP *CFP, MVT VT) {
396 // Positive zero (+0.0) has to be materialized with a fmov from the zero
397 // register, because the immediate version of fmov cannot encode zero.
398 if (CFP->isNullValue())
399 return fastMaterializeFloatZero(CFP);
401 if (VT != MVT::f32 && VT != MVT::f64)
404 const APFloat Val = CFP->getValueAPF();
405 bool Is64Bit = (VT == MVT::f64);
406 // This checks to see if we can use FMOV instructions to materialize
407 // a constant, otherwise we have to materialize via the constant pool.
409 Is64Bit ? AArch64_AM::getFP64Imm(Val) : AArch64_AM::getFP32Imm(Val);
411 unsigned Opc = Is64Bit ? AArch64::FMOVDi : AArch64::FMOVSi;
412 return fastEmitInst_i(Opc, TLI.getRegClassFor(VT), Imm);
415 // For the MachO large code model materialize the FP constant in code.
416 if (Subtarget->isTargetMachO() && TM.getCodeModel() == CodeModel::Large) {
417 unsigned Opc1 = Is64Bit ? AArch64::MOVi64imm : AArch64::MOVi32imm;
418 const TargetRegisterClass *RC = Is64Bit ?
419 &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
421 unsigned TmpReg = createResultReg(RC);
422 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc1), TmpReg)
423 .addImm(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
425 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
426 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
427 TII.get(TargetOpcode::COPY), ResultReg)
428 .addReg(TmpReg, getKillRegState(true));
433 // Materialize via constant pool. MachineConstantPool wants an explicit
435 unsigned Align = DL.getPrefTypeAlignment(CFP->getType());
437 Align = DL.getTypeAllocSize(CFP->getType());
439 unsigned CPI = MCP.getConstantPoolIndex(cast<Constant>(CFP), Align);
440 unsigned ADRPReg = createResultReg(&AArch64::GPR64commonRegClass);
441 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
442 ADRPReg).addConstantPoolIndex(CPI, 0, AArch64II::MO_PAGE);
444 unsigned Opc = Is64Bit ? AArch64::LDRDui : AArch64::LDRSui;
445 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
446 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
448 .addConstantPoolIndex(CPI, 0, AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
452 unsigned AArch64FastISel::materializeGV(const GlobalValue *GV) {
453 // We can't handle thread-local variables quickly yet.
454 if (GV->isThreadLocal())
457 // MachO still uses GOT for large code-model accesses, but ELF requires
458 // movz/movk sequences, which FastISel doesn't handle yet.
459 if (!Subtarget->useSmallAddressing() && !Subtarget->isTargetMachO())
462 unsigned OpFlags = Subtarget->ClassifyGlobalReference(GV, TM);
464 EVT DestEVT = TLI.getValueType(DL, GV->getType(), true);
465 if (!DestEVT.isSimple())
468 unsigned ADRPReg = createResultReg(&AArch64::GPR64commonRegClass);
471 if (OpFlags & AArch64II::MO_GOT) {
473 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
475 .addGlobalAddress(GV, 0, AArch64II::MO_PAGE | OpFlags);
478 if (Subtarget->isTargetILP32()) {
479 ResultReg = createResultReg(&AArch64::GPR32RegClass);
480 LdrOpc = AArch64::LDRWui;
482 ResultReg = createResultReg(&AArch64::GPR64RegClass);
483 LdrOpc = AArch64::LDRXui;
485 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(LdrOpc),
488 .addGlobalAddress(GV, 0, AArch64II::MO_GOT | AArch64II::MO_PAGEOFF |
489 AArch64II::MO_NC | OpFlags);
490 if (!Subtarget->isTargetILP32())
493 // LDRWui produces a 32-bit register, but pointers in-register are 64-bits
494 // so we must extend the result on ILP32.
495 unsigned Result64 = createResultReg(&AArch64::GPR64RegClass);
496 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
497 TII.get(TargetOpcode::SUBREG_TO_REG))
500 .addReg(ResultReg, RegState::Kill)
501 .addImm(AArch64::sub_32);
505 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
507 .addGlobalAddress(GV, 0, AArch64II::MO_PAGE | OpFlags);
509 ResultReg = createResultReg(&AArch64::GPR64spRegClass);
510 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADDXri),
513 .addGlobalAddress(GV, 0,
514 AArch64II::MO_PAGEOFF | AArch64II::MO_NC | OpFlags)
520 unsigned AArch64FastISel::fastMaterializeConstant(const Constant *C) {
521 EVT CEVT = TLI.getValueType(DL, C->getType(), true);
523 // Only handle simple types.
524 if (!CEVT.isSimple())
526 MVT VT = CEVT.getSimpleVT();
527 // arm64_32 has 32-bit pointers held in 64-bit registers. Because of that,
528 // 'null' pointers need to have a somewhat special treatment.
529 if (const auto *CPN = dyn_cast<ConstantPointerNull>(C)) {
531 assert(CPN->getType()->getPointerAddressSpace() == 0 &&
532 "Unexpected address space");
533 assert(VT == MVT::i64 && "Expected 64-bit pointers");
534 return materializeInt(ConstantInt::get(Type::getInt64Ty(*Context), 0), VT);
537 if (const auto *CI = dyn_cast<ConstantInt>(C))
538 return materializeInt(CI, VT);
539 else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C))
540 return materializeFP(CFP, VT);
541 else if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
542 return materializeGV(GV);
547 unsigned AArch64FastISel::fastMaterializeFloatZero(const ConstantFP* CFP) {
548 assert(CFP->isNullValue() &&
549 "Floating-point constant is not a positive zero.");
551 if (!isTypeLegal(CFP->getType(), VT))
554 if (VT != MVT::f32 && VT != MVT::f64)
557 bool Is64Bit = (VT == MVT::f64);
558 unsigned ZReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
559 unsigned Opc = Is64Bit ? AArch64::FMOVXDr : AArch64::FMOVWSr;
560 return fastEmitInst_r(Opc, TLI.getRegClassFor(VT), ZReg, /*IsKill=*/true);
563 /// Check if the multiply is by a power-of-2 constant.
564 static bool isMulPowOf2(const Value *I) {
565 if (const auto *MI = dyn_cast<MulOperator>(I)) {
566 if (const auto *C = dyn_cast<ConstantInt>(MI->getOperand(0)))
567 if (C->getValue().isPowerOf2())
569 if (const auto *C = dyn_cast<ConstantInt>(MI->getOperand(1)))
570 if (C->getValue().isPowerOf2())
576 // Computes the address to get to an object.
577 bool AArch64FastISel::computeAddress(const Value *Obj, Address &Addr, Type *Ty)
579 const User *U = nullptr;
580 unsigned Opcode = Instruction::UserOp1;
581 if (const Instruction *I = dyn_cast<Instruction>(Obj)) {
582 // Don't walk into other basic blocks unless the object is an alloca from
583 // another block, otherwise it may not have a virtual register assigned.
584 if (FuncInfo.StaticAllocaMap.count(static_cast<const AllocaInst *>(Obj)) ||
585 FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
586 Opcode = I->getOpcode();
589 } else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(Obj)) {
590 Opcode = C->getOpcode();
594 if (auto *Ty = dyn_cast<PointerType>(Obj->getType()))
595 if (Ty->getAddressSpace() > 255)
596 // Fast instruction selection doesn't support the special
603 case Instruction::BitCast:
604 // Look through bitcasts.
605 return computeAddress(U->getOperand(0), Addr, Ty);
607 case Instruction::IntToPtr:
608 // Look past no-op inttoptrs.
609 if (TLI.getValueType(DL, U->getOperand(0)->getType()) ==
610 TLI.getPointerTy(DL))
611 return computeAddress(U->getOperand(0), Addr, Ty);
614 case Instruction::PtrToInt:
615 // Look past no-op ptrtoints.
616 if (TLI.getValueType(DL, U->getType()) == TLI.getPointerTy(DL))
617 return computeAddress(U->getOperand(0), Addr, Ty);
620 case Instruction::GetElementPtr: {
621 Address SavedAddr = Addr;
622 uint64_t TmpOffset = Addr.getOffset();
624 // Iterate through the GEP folding the constants into offsets where
626 for (gep_type_iterator GTI = gep_type_begin(U), E = gep_type_end(U);
628 const Value *Op = GTI.getOperand();
629 if (StructType *STy = GTI.getStructTypeOrNull()) {
630 const StructLayout *SL = DL.getStructLayout(STy);
631 unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
632 TmpOffset += SL->getElementOffset(Idx);
634 uint64_t S = DL.getTypeAllocSize(GTI.getIndexedType());
636 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
637 // Constant-offset addressing.
638 TmpOffset += CI->getSExtValue() * S;
641 if (canFoldAddIntoGEP(U, Op)) {
642 // A compatible add with a constant operand. Fold the constant.
644 cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
645 TmpOffset += CI->getSExtValue() * S;
646 // Iterate on the other operand.
647 Op = cast<AddOperator>(Op)->getOperand(0);
651 goto unsupported_gep;
656 // Try to grab the base operand now.
657 Addr.setOffset(TmpOffset);
658 if (computeAddress(U->getOperand(0), Addr, Ty))
661 // We failed, restore everything and try the other options.
667 case Instruction::Alloca: {
668 const AllocaInst *AI = cast<AllocaInst>(Obj);
669 DenseMap<const AllocaInst *, int>::iterator SI =
670 FuncInfo.StaticAllocaMap.find(AI);
671 if (SI != FuncInfo.StaticAllocaMap.end()) {
672 Addr.setKind(Address::FrameIndexBase);
673 Addr.setFI(SI->second);
678 case Instruction::Add: {
679 // Adds of constants are common and easy enough.
680 const Value *LHS = U->getOperand(0);
681 const Value *RHS = U->getOperand(1);
683 if (isa<ConstantInt>(LHS))
686 if (const ConstantInt *CI = dyn_cast<ConstantInt>(RHS)) {
687 Addr.setOffset(Addr.getOffset() + CI->getSExtValue());
688 return computeAddress(LHS, Addr, Ty);
691 Address Backup = Addr;
692 if (computeAddress(LHS, Addr, Ty) && computeAddress(RHS, Addr, Ty))
698 case Instruction::Sub: {
699 // Subs of constants are common and easy enough.
700 const Value *LHS = U->getOperand(0);
701 const Value *RHS = U->getOperand(1);
703 if (const ConstantInt *CI = dyn_cast<ConstantInt>(RHS)) {
704 Addr.setOffset(Addr.getOffset() - CI->getSExtValue());
705 return computeAddress(LHS, Addr, Ty);
709 case Instruction::Shl: {
710 if (Addr.getOffsetReg())
713 const auto *CI = dyn_cast<ConstantInt>(U->getOperand(1));
717 unsigned Val = CI->getZExtValue();
718 if (Val < 1 || Val > 3)
721 uint64_t NumBytes = 0;
722 if (Ty && Ty->isSized()) {
723 uint64_t NumBits = DL.getTypeSizeInBits(Ty);
724 NumBytes = NumBits / 8;
725 if (!isPowerOf2_64(NumBits))
729 if (NumBytes != (1ULL << Val))
733 Addr.setExtendType(AArch64_AM::LSL);
735 const Value *Src = U->getOperand(0);
736 if (const auto *I = dyn_cast<Instruction>(Src)) {
737 if (FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
738 // Fold the zext or sext when it won't become a noop.
739 if (const auto *ZE = dyn_cast<ZExtInst>(I)) {
740 if (!isIntExtFree(ZE) &&
741 ZE->getOperand(0)->getType()->isIntegerTy(32)) {
742 Addr.setExtendType(AArch64_AM::UXTW);
743 Src = ZE->getOperand(0);
745 } else if (const auto *SE = dyn_cast<SExtInst>(I)) {
746 if (!isIntExtFree(SE) &&
747 SE->getOperand(0)->getType()->isIntegerTy(32)) {
748 Addr.setExtendType(AArch64_AM::SXTW);
749 Src = SE->getOperand(0);
755 if (const auto *AI = dyn_cast<BinaryOperator>(Src))
756 if (AI->getOpcode() == Instruction::And) {
757 const Value *LHS = AI->getOperand(0);
758 const Value *RHS = AI->getOperand(1);
760 if (const auto *C = dyn_cast<ConstantInt>(LHS))
761 if (C->getValue() == 0xffffffff)
764 if (const auto *C = dyn_cast<ConstantInt>(RHS))
765 if (C->getValue() == 0xffffffff) {
766 Addr.setExtendType(AArch64_AM::UXTW);
767 unsigned Reg = getRegForValue(LHS);
770 bool RegIsKill = hasTrivialKill(LHS);
771 Reg = fastEmitInst_extractsubreg(MVT::i32, Reg, RegIsKill,
773 Addr.setOffsetReg(Reg);
778 unsigned Reg = getRegForValue(Src);
781 Addr.setOffsetReg(Reg);
784 case Instruction::Mul: {
785 if (Addr.getOffsetReg())
791 const Value *LHS = U->getOperand(0);
792 const Value *RHS = U->getOperand(1);
794 // Canonicalize power-of-2 value to the RHS.
795 if (const auto *C = dyn_cast<ConstantInt>(LHS))
796 if (C->getValue().isPowerOf2())
799 assert(isa<ConstantInt>(RHS) && "Expected an ConstantInt.");
800 const auto *C = cast<ConstantInt>(RHS);
801 unsigned Val = C->getValue().logBase2();
802 if (Val < 1 || Val > 3)
805 uint64_t NumBytes = 0;
806 if (Ty && Ty->isSized()) {
807 uint64_t NumBits = DL.getTypeSizeInBits(Ty);
808 NumBytes = NumBits / 8;
809 if (!isPowerOf2_64(NumBits))
813 if (NumBytes != (1ULL << Val))
817 Addr.setExtendType(AArch64_AM::LSL);
819 const Value *Src = LHS;
820 if (const auto *I = dyn_cast<Instruction>(Src)) {
821 if (FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
822 // Fold the zext or sext when it won't become a noop.
823 if (const auto *ZE = dyn_cast<ZExtInst>(I)) {
824 if (!isIntExtFree(ZE) &&
825 ZE->getOperand(0)->getType()->isIntegerTy(32)) {
826 Addr.setExtendType(AArch64_AM::UXTW);
827 Src = ZE->getOperand(0);
829 } else if (const auto *SE = dyn_cast<SExtInst>(I)) {
830 if (!isIntExtFree(SE) &&
831 SE->getOperand(0)->getType()->isIntegerTy(32)) {
832 Addr.setExtendType(AArch64_AM::SXTW);
833 Src = SE->getOperand(0);
839 unsigned Reg = getRegForValue(Src);
842 Addr.setOffsetReg(Reg);
845 case Instruction::And: {
846 if (Addr.getOffsetReg())
849 if (!Ty || DL.getTypeSizeInBits(Ty) != 8)
852 const Value *LHS = U->getOperand(0);
853 const Value *RHS = U->getOperand(1);
855 if (const auto *C = dyn_cast<ConstantInt>(LHS))
856 if (C->getValue() == 0xffffffff)
859 if (const auto *C = dyn_cast<ConstantInt>(RHS))
860 if (C->getValue() == 0xffffffff) {
862 Addr.setExtendType(AArch64_AM::LSL);
863 Addr.setExtendType(AArch64_AM::UXTW);
865 unsigned Reg = getRegForValue(LHS);
868 bool RegIsKill = hasTrivialKill(LHS);
869 Reg = fastEmitInst_extractsubreg(MVT::i32, Reg, RegIsKill,
871 Addr.setOffsetReg(Reg);
876 case Instruction::SExt:
877 case Instruction::ZExt: {
878 if (!Addr.getReg() || Addr.getOffsetReg())
881 const Value *Src = nullptr;
882 // Fold the zext or sext when it won't become a noop.
883 if (const auto *ZE = dyn_cast<ZExtInst>(U)) {
884 if (!isIntExtFree(ZE) && ZE->getOperand(0)->getType()->isIntegerTy(32)) {
885 Addr.setExtendType(AArch64_AM::UXTW);
886 Src = ZE->getOperand(0);
888 } else if (const auto *SE = dyn_cast<SExtInst>(U)) {
889 if (!isIntExtFree(SE) && SE->getOperand(0)->getType()->isIntegerTy(32)) {
890 Addr.setExtendType(AArch64_AM::SXTW);
891 Src = SE->getOperand(0);
899 unsigned Reg = getRegForValue(Src);
902 Addr.setOffsetReg(Reg);
907 if (Addr.isRegBase() && !Addr.getReg()) {
908 unsigned Reg = getRegForValue(Obj);
915 if (!Addr.getOffsetReg()) {
916 unsigned Reg = getRegForValue(Obj);
919 Addr.setOffsetReg(Reg);
926 bool AArch64FastISel::computeCallAddress(const Value *V, Address &Addr) {
927 const User *U = nullptr;
928 unsigned Opcode = Instruction::UserOp1;
931 if (const auto *I = dyn_cast<Instruction>(V)) {
932 Opcode = I->getOpcode();
934 InMBB = I->getParent() == FuncInfo.MBB->getBasicBlock();
935 } else if (const auto *C = dyn_cast<ConstantExpr>(V)) {
936 Opcode = C->getOpcode();
942 case Instruction::BitCast:
943 // Look past bitcasts if its operand is in the same BB.
945 return computeCallAddress(U->getOperand(0), Addr);
947 case Instruction::IntToPtr:
948 // Look past no-op inttoptrs if its operand is in the same BB.
950 TLI.getValueType(DL, U->getOperand(0)->getType()) ==
951 TLI.getPointerTy(DL))
952 return computeCallAddress(U->getOperand(0), Addr);
954 case Instruction::PtrToInt:
955 // Look past no-op ptrtoints if its operand is in the same BB.
956 if (InMBB && TLI.getValueType(DL, U->getType()) == TLI.getPointerTy(DL))
957 return computeCallAddress(U->getOperand(0), Addr);
961 if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
962 Addr.setGlobalValue(GV);
966 // If all else fails, try to materialize the value in a register.
967 if (!Addr.getGlobalValue()) {
968 Addr.setReg(getRegForValue(V));
969 return Addr.getReg() != 0;
975 bool AArch64FastISel::isTypeLegal(Type *Ty, MVT &VT) {
976 EVT evt = TLI.getValueType(DL, Ty, true);
978 if (Subtarget->isTargetILP32() && Ty->isPointerTy())
981 // Only handle simple types.
982 if (evt == MVT::Other || !evt.isSimple())
984 VT = evt.getSimpleVT();
986 // This is a legal type, but it's not something we handle in fast-isel.
990 // Handle all other legal types, i.e. a register that will directly hold this
992 return TLI.isTypeLegal(VT);
995 /// Determine if the value type is supported by FastISel.
997 /// FastISel for AArch64 can handle more value types than are legal. This adds
998 /// simple value type such as i1, i8, and i16.
999 bool AArch64FastISel::isTypeSupported(Type *Ty, MVT &VT, bool IsVectorAllowed) {
1000 if (Ty->isVectorTy() && !IsVectorAllowed)
1003 if (isTypeLegal(Ty, VT))
1006 // If this is a type than can be sign or zero-extended to a basic operation
1007 // go ahead and accept it now.
1008 if (VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16)
1014 bool AArch64FastISel::isValueAvailable(const Value *V) const {
1015 if (!isa<Instruction>(V))
1018 const auto *I = cast<Instruction>(V);
1019 return FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB;
1022 bool AArch64FastISel::simplifyAddress(Address &Addr, MVT VT) {
1023 if (Subtarget->isTargetILP32())
1026 unsigned ScaleFactor = getImplicitScaleFactor(VT);
1030 bool ImmediateOffsetNeedsLowering = false;
1031 bool RegisterOffsetNeedsLowering = false;
1032 int64_t Offset = Addr.getOffset();
1033 if (((Offset < 0) || (Offset & (ScaleFactor - 1))) && !isInt<9>(Offset))
1034 ImmediateOffsetNeedsLowering = true;
1035 else if (Offset > 0 && !(Offset & (ScaleFactor - 1)) &&
1036 !isUInt<12>(Offset / ScaleFactor))
1037 ImmediateOffsetNeedsLowering = true;
1039 // Cannot encode an offset register and an immediate offset in the same
1040 // instruction. Fold the immediate offset into the load/store instruction and
1041 // emit an additional add to take care of the offset register.
1042 if (!ImmediateOffsetNeedsLowering && Addr.getOffset() && Addr.getOffsetReg())
1043 RegisterOffsetNeedsLowering = true;
1045 // Cannot encode zero register as base.
1046 if (Addr.isRegBase() && Addr.getOffsetReg() && !Addr.getReg())
1047 RegisterOffsetNeedsLowering = true;
1049 // If this is a stack pointer and the offset needs to be simplified then put
1050 // the alloca address into a register, set the base type back to register and
1051 // continue. This should almost never happen.
1052 if ((ImmediateOffsetNeedsLowering || Addr.getOffsetReg()) && Addr.isFIBase())
1054 unsigned ResultReg = createResultReg(&AArch64::GPR64spRegClass);
1055 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADDXri),
1057 .addFrameIndex(Addr.getFI())
1060 Addr.setKind(Address::RegBase);
1061 Addr.setReg(ResultReg);
1064 if (RegisterOffsetNeedsLowering) {
1065 unsigned ResultReg = 0;
1066 if (Addr.getReg()) {
1067 if (Addr.getExtendType() == AArch64_AM::SXTW ||
1068 Addr.getExtendType() == AArch64_AM::UXTW )
1069 ResultReg = emitAddSub_rx(/*UseAdd=*/true, MVT::i64, Addr.getReg(),
1070 /*TODO:IsKill=*/false, Addr.getOffsetReg(),
1071 /*TODO:IsKill=*/false, Addr.getExtendType(),
1074 ResultReg = emitAddSub_rs(/*UseAdd=*/true, MVT::i64, Addr.getReg(),
1075 /*TODO:IsKill=*/false, Addr.getOffsetReg(),
1076 /*TODO:IsKill=*/false, AArch64_AM::LSL,
1079 if (Addr.getExtendType() == AArch64_AM::UXTW)
1080 ResultReg = emitLSL_ri(MVT::i64, MVT::i32, Addr.getOffsetReg(),
1081 /*Op0IsKill=*/false, Addr.getShift(),
1083 else if (Addr.getExtendType() == AArch64_AM::SXTW)
1084 ResultReg = emitLSL_ri(MVT::i64, MVT::i32, Addr.getOffsetReg(),
1085 /*Op0IsKill=*/false, Addr.getShift(),
1088 ResultReg = emitLSL_ri(MVT::i64, MVT::i64, Addr.getOffsetReg(),
1089 /*Op0IsKill=*/false, Addr.getShift());
1094 Addr.setReg(ResultReg);
1095 Addr.setOffsetReg(0);
1097 Addr.setExtendType(AArch64_AM::InvalidShiftExtend);
1100 // Since the offset is too large for the load/store instruction get the
1101 // reg+offset into a register.
1102 if (ImmediateOffsetNeedsLowering) {
1105 // Try to fold the immediate into the add instruction.
1106 ResultReg = emitAdd_ri_(MVT::i64, Addr.getReg(), /*IsKill=*/false, Offset);
1108 ResultReg = fastEmit_i(MVT::i64, MVT::i64, ISD::Constant, Offset);
1112 Addr.setReg(ResultReg);
1118 void AArch64FastISel::addLoadStoreOperands(Address &Addr,
1119 const MachineInstrBuilder &MIB,
1120 MachineMemOperand::Flags Flags,
1121 unsigned ScaleFactor,
1122 MachineMemOperand *MMO) {
1123 int64_t Offset = Addr.getOffset() / ScaleFactor;
1124 // Frame base works a bit differently. Handle it separately.
1125 if (Addr.isFIBase()) {
1126 int FI = Addr.getFI();
1127 // FIXME: We shouldn't be using getObjectSize/getObjectAlignment. The size
1128 // and alignment should be based on the VT.
1129 MMO = FuncInfo.MF->getMachineMemOperand(
1130 MachinePointerInfo::getFixedStack(*FuncInfo.MF, FI, Offset), Flags,
1131 MFI.getObjectSize(FI), MFI.getObjectAlignment(FI));
1132 // Now add the rest of the operands.
1133 MIB.addFrameIndex(FI).addImm(Offset);
1135 assert(Addr.isRegBase() && "Unexpected address kind.");
1136 const MCInstrDesc &II = MIB->getDesc();
1137 unsigned Idx = (Flags & MachineMemOperand::MOStore) ? 1 : 0;
1139 constrainOperandRegClass(II, Addr.getReg(), II.getNumDefs()+Idx));
1141 constrainOperandRegClass(II, Addr.getOffsetReg(), II.getNumDefs()+Idx+1));
1142 if (Addr.getOffsetReg()) {
1143 assert(Addr.getOffset() == 0 && "Unexpected offset");
1144 bool IsSigned = Addr.getExtendType() == AArch64_AM::SXTW ||
1145 Addr.getExtendType() == AArch64_AM::SXTX;
1146 MIB.addReg(Addr.getReg());
1147 MIB.addReg(Addr.getOffsetReg());
1148 MIB.addImm(IsSigned);
1149 MIB.addImm(Addr.getShift() != 0);
1151 MIB.addReg(Addr.getReg()).addImm(Offset);
1155 MIB.addMemOperand(MMO);
1158 unsigned AArch64FastISel::emitAddSub(bool UseAdd, MVT RetVT, const Value *LHS,
1159 const Value *RHS, bool SetFlags,
1160 bool WantResult, bool IsZExt) {
1161 AArch64_AM::ShiftExtendType ExtendType = AArch64_AM::InvalidShiftExtend;
1162 bool NeedExtend = false;
1163 switch (RetVT.SimpleTy) {
1171 ExtendType = IsZExt ? AArch64_AM::UXTB : AArch64_AM::SXTB;
1175 ExtendType = IsZExt ? AArch64_AM::UXTH : AArch64_AM::SXTH;
1177 case MVT::i32: // fall-through
1182 RetVT.SimpleTy = std::max(RetVT.SimpleTy, MVT::i32);
1184 // Canonicalize immediates to the RHS first.
1185 if (UseAdd && isa<Constant>(LHS) && !isa<Constant>(RHS))
1186 std::swap(LHS, RHS);
1188 // Canonicalize mul by power of 2 to the RHS.
1189 if (UseAdd && LHS->hasOneUse() && isValueAvailable(LHS))
1190 if (isMulPowOf2(LHS))
1191 std::swap(LHS, RHS);
1193 // Canonicalize shift immediate to the RHS.
1194 if (UseAdd && LHS->hasOneUse() && isValueAvailable(LHS))
1195 if (const auto *SI = dyn_cast<BinaryOperator>(LHS))
1196 if (isa<ConstantInt>(SI->getOperand(1)))
1197 if (SI->getOpcode() == Instruction::Shl ||
1198 SI->getOpcode() == Instruction::LShr ||
1199 SI->getOpcode() == Instruction::AShr )
1200 std::swap(LHS, RHS);
1202 unsigned LHSReg = getRegForValue(LHS);
1205 bool LHSIsKill = hasTrivialKill(LHS);
1208 LHSReg = emitIntExt(SrcVT, LHSReg, RetVT, IsZExt);
1210 unsigned ResultReg = 0;
1211 if (const auto *C = dyn_cast<ConstantInt>(RHS)) {
1212 uint64_t Imm = IsZExt ? C->getZExtValue() : C->getSExtValue();
1213 if (C->isNegative())
1214 ResultReg = emitAddSub_ri(!UseAdd, RetVT, LHSReg, LHSIsKill, -Imm,
1215 SetFlags, WantResult);
1217 ResultReg = emitAddSub_ri(UseAdd, RetVT, LHSReg, LHSIsKill, Imm, SetFlags,
1219 } else if (const auto *C = dyn_cast<Constant>(RHS))
1220 if (C->isNullValue())
1221 ResultReg = emitAddSub_ri(UseAdd, RetVT, LHSReg, LHSIsKill, 0, SetFlags,
1227 // Only extend the RHS within the instruction if there is a valid extend type.
1228 if (ExtendType != AArch64_AM::InvalidShiftExtend && RHS->hasOneUse() &&
1229 isValueAvailable(RHS)) {
1230 if (const auto *SI = dyn_cast<BinaryOperator>(RHS))
1231 if (const auto *C = dyn_cast<ConstantInt>(SI->getOperand(1)))
1232 if ((SI->getOpcode() == Instruction::Shl) && (C->getZExtValue() < 4)) {
1233 unsigned RHSReg = getRegForValue(SI->getOperand(0));
1236 bool RHSIsKill = hasTrivialKill(SI->getOperand(0));
1237 return emitAddSub_rx(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg,
1238 RHSIsKill, ExtendType, C->getZExtValue(),
1239 SetFlags, WantResult);
1241 unsigned RHSReg = getRegForValue(RHS);
1244 bool RHSIsKill = hasTrivialKill(RHS);
1245 return emitAddSub_rx(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg, RHSIsKill,
1246 ExtendType, 0, SetFlags, WantResult);
1249 // Check if the mul can be folded into the instruction.
1250 if (RHS->hasOneUse() && isValueAvailable(RHS)) {
1251 if (isMulPowOf2(RHS)) {
1252 const Value *MulLHS = cast<MulOperator>(RHS)->getOperand(0);
1253 const Value *MulRHS = cast<MulOperator>(RHS)->getOperand(1);
1255 if (const auto *C = dyn_cast<ConstantInt>(MulLHS))
1256 if (C->getValue().isPowerOf2())
1257 std::swap(MulLHS, MulRHS);
1259 assert(isa<ConstantInt>(MulRHS) && "Expected a ConstantInt.");
1260 uint64_t ShiftVal = cast<ConstantInt>(MulRHS)->getValue().logBase2();
1261 unsigned RHSReg = getRegForValue(MulLHS);
1264 bool RHSIsKill = hasTrivialKill(MulLHS);
1265 ResultReg = emitAddSub_rs(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg,
1266 RHSIsKill, AArch64_AM::LSL, ShiftVal, SetFlags,
1273 // Check if the shift can be folded into the instruction.
1274 if (RHS->hasOneUse() && isValueAvailable(RHS)) {
1275 if (const auto *SI = dyn_cast<BinaryOperator>(RHS)) {
1276 if (const auto *C = dyn_cast<ConstantInt>(SI->getOperand(1))) {
1277 AArch64_AM::ShiftExtendType ShiftType = AArch64_AM::InvalidShiftExtend;
1278 switch (SI->getOpcode()) {
1280 case Instruction::Shl: ShiftType = AArch64_AM::LSL; break;
1281 case Instruction::LShr: ShiftType = AArch64_AM::LSR; break;
1282 case Instruction::AShr: ShiftType = AArch64_AM::ASR; break;
1284 uint64_t ShiftVal = C->getZExtValue();
1285 if (ShiftType != AArch64_AM::InvalidShiftExtend) {
1286 unsigned RHSReg = getRegForValue(SI->getOperand(0));
1289 bool RHSIsKill = hasTrivialKill(SI->getOperand(0));
1290 ResultReg = emitAddSub_rs(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg,
1291 RHSIsKill, ShiftType, ShiftVal, SetFlags,
1300 unsigned RHSReg = getRegForValue(RHS);
1303 bool RHSIsKill = hasTrivialKill(RHS);
1306 RHSReg = emitIntExt(SrcVT, RHSReg, RetVT, IsZExt);
1308 return emitAddSub_rr(UseAdd, RetVT, LHSReg, LHSIsKill, RHSReg, RHSIsKill,
1309 SetFlags, WantResult);
1312 unsigned AArch64FastISel::emitAddSub_rr(bool UseAdd, MVT RetVT, unsigned LHSReg,
1313 bool LHSIsKill, unsigned RHSReg,
1314 bool RHSIsKill, bool SetFlags,
1316 assert(LHSReg && RHSReg && "Invalid register number.");
1318 if (LHSReg == AArch64::SP || LHSReg == AArch64::WSP ||
1319 RHSReg == AArch64::SP || RHSReg == AArch64::WSP)
1322 if (RetVT != MVT::i32 && RetVT != MVT::i64)
1325 static const unsigned OpcTable[2][2][2] = {
1326 { { AArch64::SUBWrr, AArch64::SUBXrr },
1327 { AArch64::ADDWrr, AArch64::ADDXrr } },
1328 { { AArch64::SUBSWrr, AArch64::SUBSXrr },
1329 { AArch64::ADDSWrr, AArch64::ADDSXrr } }
1331 bool Is64Bit = RetVT == MVT::i64;
1332 unsigned Opc = OpcTable[SetFlags][UseAdd][Is64Bit];
1333 const TargetRegisterClass *RC =
1334 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
1337 ResultReg = createResultReg(RC);
1339 ResultReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
1341 const MCInstrDesc &II = TII.get(Opc);
1342 LHSReg = constrainOperandRegClass(II, LHSReg, II.getNumDefs());
1343 RHSReg = constrainOperandRegClass(II, RHSReg, II.getNumDefs() + 1);
1344 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, ResultReg)
1345 .addReg(LHSReg, getKillRegState(LHSIsKill))
1346 .addReg(RHSReg, getKillRegState(RHSIsKill));
1350 unsigned AArch64FastISel::emitAddSub_ri(bool UseAdd, MVT RetVT, unsigned LHSReg,
1351 bool LHSIsKill, uint64_t Imm,
1352 bool SetFlags, bool WantResult) {
1353 assert(LHSReg && "Invalid register number.");
1355 if (RetVT != MVT::i32 && RetVT != MVT::i64)
1359 if (isUInt<12>(Imm))
1361 else if ((Imm & 0xfff000) == Imm) {
1367 static const unsigned OpcTable[2][2][2] = {
1368 { { AArch64::SUBWri, AArch64::SUBXri },
1369 { AArch64::ADDWri, AArch64::ADDXri } },
1370 { { AArch64::SUBSWri, AArch64::SUBSXri },
1371 { AArch64::ADDSWri, AArch64::ADDSXri } }
1373 bool Is64Bit = RetVT == MVT::i64;
1374 unsigned Opc = OpcTable[SetFlags][UseAdd][Is64Bit];
1375 const TargetRegisterClass *RC;
1377 RC = Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
1379 RC = Is64Bit ? &AArch64::GPR64spRegClass : &AArch64::GPR32spRegClass;
1382 ResultReg = createResultReg(RC);
1384 ResultReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
1386 const MCInstrDesc &II = TII.get(Opc);
1387 LHSReg = constrainOperandRegClass(II, LHSReg, II.getNumDefs());
1388 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, ResultReg)
1389 .addReg(LHSReg, getKillRegState(LHSIsKill))
1391 .addImm(getShifterImm(AArch64_AM::LSL, ShiftImm));
1395 unsigned AArch64FastISel::emitAddSub_rs(bool UseAdd, MVT RetVT, unsigned LHSReg,
1396 bool LHSIsKill, unsigned RHSReg,
1398 AArch64_AM::ShiftExtendType ShiftType,
1399 uint64_t ShiftImm, bool SetFlags,
1401 assert(LHSReg && RHSReg && "Invalid register number.");
1402 assert(LHSReg != AArch64::SP && LHSReg != AArch64::WSP &&
1403 RHSReg != AArch64::SP && RHSReg != AArch64::WSP);
1405 if (RetVT != MVT::i32 && RetVT != MVT::i64)
1408 // Don't deal with undefined shifts.
1409 if (ShiftImm >= RetVT.getSizeInBits())
1412 static const unsigned OpcTable[2][2][2] = {
1413 { { AArch64::SUBWrs, AArch64::SUBXrs },
1414 { AArch64::ADDWrs, AArch64::ADDXrs } },
1415 { { AArch64::SUBSWrs, AArch64::SUBSXrs },
1416 { AArch64::ADDSWrs, AArch64::ADDSXrs } }
1418 bool Is64Bit = RetVT == MVT::i64;
1419 unsigned Opc = OpcTable[SetFlags][UseAdd][Is64Bit];
1420 const TargetRegisterClass *RC =
1421 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
1424 ResultReg = createResultReg(RC);
1426 ResultReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
1428 const MCInstrDesc &II = TII.get(Opc);
1429 LHSReg = constrainOperandRegClass(II, LHSReg, II.getNumDefs());
1430 RHSReg = constrainOperandRegClass(II, RHSReg, II.getNumDefs() + 1);
1431 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, ResultReg)
1432 .addReg(LHSReg, getKillRegState(LHSIsKill))
1433 .addReg(RHSReg, getKillRegState(RHSIsKill))
1434 .addImm(getShifterImm(ShiftType, ShiftImm));
1438 unsigned AArch64FastISel::emitAddSub_rx(bool UseAdd, MVT RetVT, unsigned LHSReg,
1439 bool LHSIsKill, unsigned RHSReg,
1441 AArch64_AM::ShiftExtendType ExtType,
1442 uint64_t ShiftImm, bool SetFlags,
1444 assert(LHSReg && RHSReg && "Invalid register number.");
1445 assert(LHSReg != AArch64::XZR && LHSReg != AArch64::WZR &&
1446 RHSReg != AArch64::XZR && RHSReg != AArch64::WZR);
1448 if (RetVT != MVT::i32 && RetVT != MVT::i64)
1454 static const unsigned OpcTable[2][2][2] = {
1455 { { AArch64::SUBWrx, AArch64::SUBXrx },
1456 { AArch64::ADDWrx, AArch64::ADDXrx } },
1457 { { AArch64::SUBSWrx, AArch64::SUBSXrx },
1458 { AArch64::ADDSWrx, AArch64::ADDSXrx } }
1460 bool Is64Bit = RetVT == MVT::i64;
1461 unsigned Opc = OpcTable[SetFlags][UseAdd][Is64Bit];
1462 const TargetRegisterClass *RC = nullptr;
1464 RC = Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
1466 RC = Is64Bit ? &AArch64::GPR64spRegClass : &AArch64::GPR32spRegClass;
1469 ResultReg = createResultReg(RC);
1471 ResultReg = Is64Bit ? AArch64::XZR : AArch64::WZR;
1473 const MCInstrDesc &II = TII.get(Opc);
1474 LHSReg = constrainOperandRegClass(II, LHSReg, II.getNumDefs());
1475 RHSReg = constrainOperandRegClass(II, RHSReg, II.getNumDefs() + 1);
1476 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II, ResultReg)
1477 .addReg(LHSReg, getKillRegState(LHSIsKill))
1478 .addReg(RHSReg, getKillRegState(RHSIsKill))
1479 .addImm(getArithExtendImm(ExtType, ShiftImm));
1483 bool AArch64FastISel::emitCmp(const Value *LHS, const Value *RHS, bool IsZExt) {
1484 Type *Ty = LHS->getType();
1485 EVT EVT = TLI.getValueType(DL, Ty, true);
1486 if (!EVT.isSimple())
1488 MVT VT = EVT.getSimpleVT();
1490 switch (VT.SimpleTy) {
1498 return emitICmp(VT, LHS, RHS, IsZExt);
1501 return emitFCmp(VT, LHS, RHS);
1505 bool AArch64FastISel::emitICmp(MVT RetVT, const Value *LHS, const Value *RHS,
1507 return emitSub(RetVT, LHS, RHS, /*SetFlags=*/true, /*WantResult=*/false,
1511 bool AArch64FastISel::emitICmp_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
1513 return emitAddSub_ri(/*UseAdd=*/false, RetVT, LHSReg, LHSIsKill, Imm,
1514 /*SetFlags=*/true, /*WantResult=*/false) != 0;
1517 bool AArch64FastISel::emitFCmp(MVT RetVT, const Value *LHS, const Value *RHS) {
1518 if (RetVT != MVT::f32 && RetVT != MVT::f64)
1521 // Check to see if the 2nd operand is a constant that we can encode directly
1523 bool UseImm = false;
1524 if (const auto *CFP = dyn_cast<ConstantFP>(RHS))
1525 if (CFP->isZero() && !CFP->isNegative())
1528 unsigned LHSReg = getRegForValue(LHS);
1531 bool LHSIsKill = hasTrivialKill(LHS);
1534 unsigned Opc = (RetVT == MVT::f64) ? AArch64::FCMPDri : AArch64::FCMPSri;
1535 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
1536 .addReg(LHSReg, getKillRegState(LHSIsKill));
1540 unsigned RHSReg = getRegForValue(RHS);
1543 bool RHSIsKill = hasTrivialKill(RHS);
1545 unsigned Opc = (RetVT == MVT::f64) ? AArch64::FCMPDrr : AArch64::FCMPSrr;
1546 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
1547 .addReg(LHSReg, getKillRegState(LHSIsKill))
1548 .addReg(RHSReg, getKillRegState(RHSIsKill));
1552 unsigned AArch64FastISel::emitAdd(MVT RetVT, const Value *LHS, const Value *RHS,
1553 bool SetFlags, bool WantResult, bool IsZExt) {
1554 return emitAddSub(/*UseAdd=*/true, RetVT, LHS, RHS, SetFlags, WantResult,
1558 /// This method is a wrapper to simplify add emission.
1560 /// First try to emit an add with an immediate operand using emitAddSub_ri. If
1561 /// that fails, then try to materialize the immediate into a register and use
1562 /// emitAddSub_rr instead.
1563 unsigned AArch64FastISel::emitAdd_ri_(MVT VT, unsigned Op0, bool Op0IsKill,
1567 ResultReg = emitAddSub_ri(false, VT, Op0, Op0IsKill, -Imm);
1569 ResultReg = emitAddSub_ri(true, VT, Op0, Op0IsKill, Imm);
1574 unsigned CReg = fastEmit_i(VT, VT, ISD::Constant, Imm);
1578 ResultReg = emitAddSub_rr(true, VT, Op0, Op0IsKill, CReg, true);
1582 unsigned AArch64FastISel::emitSub(MVT RetVT, const Value *LHS, const Value *RHS,
1583 bool SetFlags, bool WantResult, bool IsZExt) {
1584 return emitAddSub(/*UseAdd=*/false, RetVT, LHS, RHS, SetFlags, WantResult,
1588 unsigned AArch64FastISel::emitSubs_rr(MVT RetVT, unsigned LHSReg,
1589 bool LHSIsKill, unsigned RHSReg,
1590 bool RHSIsKill, bool WantResult) {
1591 return emitAddSub_rr(/*UseAdd=*/false, RetVT, LHSReg, LHSIsKill, RHSReg,
1592 RHSIsKill, /*SetFlags=*/true, WantResult);
1595 unsigned AArch64FastISel::emitSubs_rs(MVT RetVT, unsigned LHSReg,
1596 bool LHSIsKill, unsigned RHSReg,
1598 AArch64_AM::ShiftExtendType ShiftType,
1599 uint64_t ShiftImm, bool WantResult) {
1600 return emitAddSub_rs(/*UseAdd=*/false, RetVT, LHSReg, LHSIsKill, RHSReg,
1601 RHSIsKill, ShiftType, ShiftImm, /*SetFlags=*/true,
1605 unsigned AArch64FastISel::emitLogicalOp(unsigned ISDOpc, MVT RetVT,
1606 const Value *LHS, const Value *RHS) {
1607 // Canonicalize immediates to the RHS first.
1608 if (isa<ConstantInt>(LHS) && !isa<ConstantInt>(RHS))
1609 std::swap(LHS, RHS);
1611 // Canonicalize mul by power-of-2 to the RHS.
1612 if (LHS->hasOneUse() && isValueAvailable(LHS))
1613 if (isMulPowOf2(LHS))
1614 std::swap(LHS, RHS);
1616 // Canonicalize shift immediate to the RHS.
1617 if (LHS->hasOneUse() && isValueAvailable(LHS))
1618 if (const auto *SI = dyn_cast<ShlOperator>(LHS))
1619 if (isa<ConstantInt>(SI->getOperand(1)))
1620 std::swap(LHS, RHS);
1622 unsigned LHSReg = getRegForValue(LHS);
1625 bool LHSIsKill = hasTrivialKill(LHS);
1627 unsigned ResultReg = 0;
1628 if (const auto *C = dyn_cast<ConstantInt>(RHS)) {
1629 uint64_t Imm = C->getZExtValue();
1630 ResultReg = emitLogicalOp_ri(ISDOpc, RetVT, LHSReg, LHSIsKill, Imm);
1635 // Check if the mul can be folded into the instruction.
1636 if (RHS->hasOneUse() && isValueAvailable(RHS)) {
1637 if (isMulPowOf2(RHS)) {
1638 const Value *MulLHS = cast<MulOperator>(RHS)->getOperand(0);
1639 const Value *MulRHS = cast<MulOperator>(RHS)->getOperand(1);
1641 if (const auto *C = dyn_cast<ConstantInt>(MulLHS))
1642 if (C->getValue().isPowerOf2())
1643 std::swap(MulLHS, MulRHS);
1645 assert(isa<ConstantInt>(MulRHS) && "Expected a ConstantInt.");
1646 uint64_t ShiftVal = cast<ConstantInt>(MulRHS)->getValue().logBase2();
1648 unsigned RHSReg = getRegForValue(MulLHS);
1651 bool RHSIsKill = hasTrivialKill(MulLHS);
1652 ResultReg = emitLogicalOp_rs(ISDOpc, RetVT, LHSReg, LHSIsKill, RHSReg,
1653 RHSIsKill, ShiftVal);
1659 // Check if the shift can be folded into the instruction.
1660 if (RHS->hasOneUse() && isValueAvailable(RHS)) {
1661 if (const auto *SI = dyn_cast<ShlOperator>(RHS))
1662 if (const auto *C = dyn_cast<ConstantInt>(SI->getOperand(1))) {
1663 uint64_t ShiftVal = C->getZExtValue();
1664 unsigned RHSReg = getRegForValue(SI->getOperand(0));
1667 bool RHSIsKill = hasTrivialKill(SI->getOperand(0));
1668 ResultReg = emitLogicalOp_rs(ISDOpc, RetVT, LHSReg, LHSIsKill, RHSReg,
1669 RHSIsKill, ShiftVal);
1675 unsigned RHSReg = getRegForValue(RHS);
1678 bool RHSIsKill = hasTrivialKill(RHS);
1680 MVT VT = std::max(MVT::i32, RetVT.SimpleTy);
1681 ResultReg = fastEmit_rr(VT, VT, ISDOpc, LHSReg, LHSIsKill, RHSReg, RHSIsKill);
1682 if (RetVT >= MVT::i8 && RetVT <= MVT::i16) {
1683 uint64_t Mask = (RetVT == MVT::i8) ? 0xff : 0xffff;
1684 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
1689 unsigned AArch64FastISel::emitLogicalOp_ri(unsigned ISDOpc, MVT RetVT,
1690 unsigned LHSReg, bool LHSIsKill,
1692 static_assert((ISD::AND + 1 == ISD::OR) && (ISD::AND + 2 == ISD::XOR),
1693 "ISD nodes are not consecutive!");
1694 static const unsigned OpcTable[3][2] = {
1695 { AArch64::ANDWri, AArch64::ANDXri },
1696 { AArch64::ORRWri, AArch64::ORRXri },
1697 { AArch64::EORWri, AArch64::EORXri }
1699 const TargetRegisterClass *RC;
1702 switch (RetVT.SimpleTy) {
1709 unsigned Idx = ISDOpc - ISD::AND;
1710 Opc = OpcTable[Idx][0];
1711 RC = &AArch64::GPR32spRegClass;
1716 Opc = OpcTable[ISDOpc - ISD::AND][1];
1717 RC = &AArch64::GPR64spRegClass;
1722 if (!AArch64_AM::isLogicalImmediate(Imm, RegSize))
1725 unsigned ResultReg =
1726 fastEmitInst_ri(Opc, RC, LHSReg, LHSIsKill,
1727 AArch64_AM::encodeLogicalImmediate(Imm, RegSize));
1728 if (RetVT >= MVT::i8 && RetVT <= MVT::i16 && ISDOpc != ISD::AND) {
1729 uint64_t Mask = (RetVT == MVT::i8) ? 0xff : 0xffff;
1730 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
1735 unsigned AArch64FastISel::emitLogicalOp_rs(unsigned ISDOpc, MVT RetVT,
1736 unsigned LHSReg, bool LHSIsKill,
1737 unsigned RHSReg, bool RHSIsKill,
1738 uint64_t ShiftImm) {
1739 static_assert((ISD::AND + 1 == ISD::OR) && (ISD::AND + 2 == ISD::XOR),
1740 "ISD nodes are not consecutive!");
1741 static const unsigned OpcTable[3][2] = {
1742 { AArch64::ANDWrs, AArch64::ANDXrs },
1743 { AArch64::ORRWrs, AArch64::ORRXrs },
1744 { AArch64::EORWrs, AArch64::EORXrs }
1747 // Don't deal with undefined shifts.
1748 if (ShiftImm >= RetVT.getSizeInBits())
1751 const TargetRegisterClass *RC;
1753 switch (RetVT.SimpleTy) {
1760 Opc = OpcTable[ISDOpc - ISD::AND][0];
1761 RC = &AArch64::GPR32RegClass;
1764 Opc = OpcTable[ISDOpc - ISD::AND][1];
1765 RC = &AArch64::GPR64RegClass;
1768 unsigned ResultReg =
1769 fastEmitInst_rri(Opc, RC, LHSReg, LHSIsKill, RHSReg, RHSIsKill,
1770 AArch64_AM::getShifterImm(AArch64_AM::LSL, ShiftImm));
1771 if (RetVT >= MVT::i8 && RetVT <= MVT::i16) {
1772 uint64_t Mask = (RetVT == MVT::i8) ? 0xff : 0xffff;
1773 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
1778 unsigned AArch64FastISel::emitAnd_ri(MVT RetVT, unsigned LHSReg, bool LHSIsKill,
1780 return emitLogicalOp_ri(ISD::AND, RetVT, LHSReg, LHSIsKill, Imm);
1783 unsigned AArch64FastISel::emitLoad(MVT VT, MVT RetVT, Address Addr,
1784 bool WantZExt, MachineMemOperand *MMO) {
1785 if (!TLI.allowsMisalignedMemoryAccesses(VT))
1788 // Simplify this down to something we can handle.
1789 if (!simplifyAddress(Addr, VT))
1792 unsigned ScaleFactor = getImplicitScaleFactor(VT);
1794 llvm_unreachable("Unexpected value type.");
1796 // Negative offsets require unscaled, 9-bit, signed immediate offsets.
1797 // Otherwise, we try using scaled, 12-bit, unsigned immediate offsets.
1798 bool UseScaled = true;
1799 if ((Addr.getOffset() < 0) || (Addr.getOffset() & (ScaleFactor - 1))) {
1804 static const unsigned GPOpcTable[2][8][4] = {
1806 { { AArch64::LDURSBWi, AArch64::LDURSHWi, AArch64::LDURWi,
1808 { AArch64::LDURSBXi, AArch64::LDURSHXi, AArch64::LDURSWi,
1810 { AArch64::LDRSBWui, AArch64::LDRSHWui, AArch64::LDRWui,
1812 { AArch64::LDRSBXui, AArch64::LDRSHXui, AArch64::LDRSWui,
1814 { AArch64::LDRSBWroX, AArch64::LDRSHWroX, AArch64::LDRWroX,
1816 { AArch64::LDRSBXroX, AArch64::LDRSHXroX, AArch64::LDRSWroX,
1818 { AArch64::LDRSBWroW, AArch64::LDRSHWroW, AArch64::LDRWroW,
1820 { AArch64::LDRSBXroW, AArch64::LDRSHXroW, AArch64::LDRSWroW,
1824 { { AArch64::LDURBBi, AArch64::LDURHHi, AArch64::LDURWi,
1826 { AArch64::LDURBBi, AArch64::LDURHHi, AArch64::LDURWi,
1828 { AArch64::LDRBBui, AArch64::LDRHHui, AArch64::LDRWui,
1830 { AArch64::LDRBBui, AArch64::LDRHHui, AArch64::LDRWui,
1832 { AArch64::LDRBBroX, AArch64::LDRHHroX, AArch64::LDRWroX,
1834 { AArch64::LDRBBroX, AArch64::LDRHHroX, AArch64::LDRWroX,
1836 { AArch64::LDRBBroW, AArch64::LDRHHroW, AArch64::LDRWroW,
1838 { AArch64::LDRBBroW, AArch64::LDRHHroW, AArch64::LDRWroW,
1843 static const unsigned FPOpcTable[4][2] = {
1844 { AArch64::LDURSi, AArch64::LDURDi },
1845 { AArch64::LDRSui, AArch64::LDRDui },
1846 { AArch64::LDRSroX, AArch64::LDRDroX },
1847 { AArch64::LDRSroW, AArch64::LDRDroW }
1851 const TargetRegisterClass *RC;
1852 bool UseRegOffset = Addr.isRegBase() && !Addr.getOffset() && Addr.getReg() &&
1853 Addr.getOffsetReg();
1854 unsigned Idx = UseRegOffset ? 2 : UseScaled ? 1 : 0;
1855 if (Addr.getExtendType() == AArch64_AM::UXTW ||
1856 Addr.getExtendType() == AArch64_AM::SXTW)
1859 bool IsRet64Bit = RetVT == MVT::i64;
1860 switch (VT.SimpleTy) {
1862 llvm_unreachable("Unexpected value type.");
1863 case MVT::i1: // Intentional fall-through.
1865 Opc = GPOpcTable[WantZExt][2 * Idx + IsRet64Bit][0];
1866 RC = (IsRet64Bit && !WantZExt) ?
1867 &AArch64::GPR64RegClass: &AArch64::GPR32RegClass;
1870 Opc = GPOpcTable[WantZExt][2 * Idx + IsRet64Bit][1];
1871 RC = (IsRet64Bit && !WantZExt) ?
1872 &AArch64::GPR64RegClass: &AArch64::GPR32RegClass;
1875 Opc = GPOpcTable[WantZExt][2 * Idx + IsRet64Bit][2];
1876 RC = (IsRet64Bit && !WantZExt) ?
1877 &AArch64::GPR64RegClass: &AArch64::GPR32RegClass;
1880 Opc = GPOpcTable[WantZExt][2 * Idx + IsRet64Bit][3];
1881 RC = &AArch64::GPR64RegClass;
1884 Opc = FPOpcTable[Idx][0];
1885 RC = &AArch64::FPR32RegClass;
1888 Opc = FPOpcTable[Idx][1];
1889 RC = &AArch64::FPR64RegClass;
1893 // Create the base instruction, then add the operands.
1894 unsigned ResultReg = createResultReg(RC);
1895 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1896 TII.get(Opc), ResultReg);
1897 addLoadStoreOperands(Addr, MIB, MachineMemOperand::MOLoad, ScaleFactor, MMO);
1899 // Loading an i1 requires special handling.
1900 if (VT == MVT::i1) {
1901 unsigned ANDReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, 1);
1902 assert(ANDReg && "Unexpected AND instruction emission failure.");
1906 // For zero-extending loads to 64bit we emit a 32bit load and then convert
1907 // the 32bit reg to a 64bit reg.
1908 if (WantZExt && RetVT == MVT::i64 && VT <= MVT::i32) {
1909 unsigned Reg64 = createResultReg(&AArch64::GPR64RegClass);
1910 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1911 TII.get(AArch64::SUBREG_TO_REG), Reg64)
1913 .addReg(ResultReg, getKillRegState(true))
1914 .addImm(AArch64::sub_32);
1920 bool AArch64FastISel::selectAddSub(const Instruction *I) {
1922 if (!isTypeSupported(I->getType(), VT, /*IsVectorAllowed=*/true))
1926 return selectOperator(I, I->getOpcode());
1929 switch (I->getOpcode()) {
1931 llvm_unreachable("Unexpected instruction.");
1932 case Instruction::Add:
1933 ResultReg = emitAdd(VT, I->getOperand(0), I->getOperand(1));
1935 case Instruction::Sub:
1936 ResultReg = emitSub(VT, I->getOperand(0), I->getOperand(1));
1942 updateValueMap(I, ResultReg);
1946 bool AArch64FastISel::selectLogicalOp(const Instruction *I) {
1948 if (!isTypeSupported(I->getType(), VT, /*IsVectorAllowed=*/true))
1952 return selectOperator(I, I->getOpcode());
1955 switch (I->getOpcode()) {
1957 llvm_unreachable("Unexpected instruction.");
1958 case Instruction::And:
1959 ResultReg = emitLogicalOp(ISD::AND, VT, I->getOperand(0), I->getOperand(1));
1961 case Instruction::Or:
1962 ResultReg = emitLogicalOp(ISD::OR, VT, I->getOperand(0), I->getOperand(1));
1964 case Instruction::Xor:
1965 ResultReg = emitLogicalOp(ISD::XOR, VT, I->getOperand(0), I->getOperand(1));
1971 updateValueMap(I, ResultReg);
1975 bool AArch64FastISel::selectLoad(const Instruction *I) {
1977 // Verify we have a legal type before going any further. Currently, we handle
1978 // simple types that will directly fit in a register (i32/f32/i64/f64) or
1979 // those that can be sign or zero-extended to a basic operation (i1/i8/i16).
1980 if (!isTypeSupported(I->getType(), VT, /*IsVectorAllowed=*/true) ||
1981 cast<LoadInst>(I)->isAtomic())
1984 const Value *SV = I->getOperand(0);
1985 if (TLI.supportSwiftError()) {
1986 // Swifterror values can come from either a function parameter with
1987 // swifterror attribute or an alloca with swifterror attribute.
1988 if (const Argument *Arg = dyn_cast<Argument>(SV)) {
1989 if (Arg->hasSwiftErrorAttr())
1993 if (const AllocaInst *Alloca = dyn_cast<AllocaInst>(SV)) {
1994 if (Alloca->isSwiftError())
1999 // See if we can handle this address.
2001 if (!computeAddress(I->getOperand(0), Addr, I->getType()))
2004 // Fold the following sign-/zero-extend into the load instruction.
2005 bool WantZExt = true;
2007 const Value *IntExtVal = nullptr;
2008 if (I->hasOneUse()) {
2009 if (const auto *ZE = dyn_cast<ZExtInst>(I->use_begin()->getUser())) {
2010 if (isTypeSupported(ZE->getType(), RetVT))
2014 } else if (const auto *SE = dyn_cast<SExtInst>(I->use_begin()->getUser())) {
2015 if (isTypeSupported(SE->getType(), RetVT))
2023 unsigned ResultReg =
2024 emitLoad(VT, RetVT, Addr, WantZExt, createMachineMemOperandFor(I));
2028 // There are a few different cases we have to handle, because the load or the
2029 // sign-/zero-extend might not be selected by FastISel if we fall-back to
2030 // SelectionDAG. There is also an ordering issue when both instructions are in
2031 // different basic blocks.
2032 // 1.) The load instruction is selected by FastISel, but the integer extend
2033 // not. This usually happens when the integer extend is in a different
2034 // basic block and SelectionDAG took over for that basic block.
2035 // 2.) The load instruction is selected before the integer extend. This only
2036 // happens when the integer extend is in a different basic block.
2037 // 3.) The load instruction is selected by SelectionDAG and the integer extend
2038 // by FastISel. This happens if there are instructions between the load
2039 // and the integer extend that couldn't be selected by FastISel.
2041 // The integer extend hasn't been emitted yet. FastISel or SelectionDAG
2042 // could select it. Emit a copy to subreg if necessary. FastISel will remove
2043 // it when it selects the integer extend.
2044 unsigned Reg = lookUpRegForValue(IntExtVal);
2045 auto *MI = MRI.getUniqueVRegDef(Reg);
2047 if (RetVT == MVT::i64 && VT <= MVT::i32) {
2049 // Delete the last emitted instruction from emitLoad (SUBREG_TO_REG).
2050 MachineBasicBlock::iterator I(std::prev(FuncInfo.InsertPt));
2051 ResultReg = std::prev(I)->getOperand(0).getReg();
2052 removeDeadCode(I, std::next(I));
2054 ResultReg = fastEmitInst_extractsubreg(MVT::i32, ResultReg,
2058 updateValueMap(I, ResultReg);
2062 // The integer extend has already been emitted - delete all the instructions
2063 // that have been emitted by the integer extend lowering code and use the
2064 // result from the load instruction directly.
2067 for (auto &Opnd : MI->uses()) {
2069 Reg = Opnd.getReg();
2073 MachineBasicBlock::iterator I(MI);
2074 removeDeadCode(I, std::next(I));
2077 MI = MRI.getUniqueVRegDef(Reg);
2079 updateValueMap(IntExtVal, ResultReg);
2083 updateValueMap(I, ResultReg);
2087 bool AArch64FastISel::emitStoreRelease(MVT VT, unsigned SrcReg,
2089 MachineMemOperand *MMO) {
2091 switch (VT.SimpleTy) {
2092 default: return false;
2093 case MVT::i8: Opc = AArch64::STLRB; break;
2094 case MVT::i16: Opc = AArch64::STLRH; break;
2095 case MVT::i32: Opc = AArch64::STLRW; break;
2096 case MVT::i64: Opc = AArch64::STLRX; break;
2099 const MCInstrDesc &II = TII.get(Opc);
2100 SrcReg = constrainOperandRegClass(II, SrcReg, 0);
2101 AddrReg = constrainOperandRegClass(II, AddrReg, 1);
2102 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II)
2105 .addMemOperand(MMO);
2109 bool AArch64FastISel::emitStore(MVT VT, unsigned SrcReg, Address Addr,
2110 MachineMemOperand *MMO) {
2111 if (!TLI.allowsMisalignedMemoryAccesses(VT))
2114 // Simplify this down to something we can handle.
2115 if (!simplifyAddress(Addr, VT))
2118 unsigned ScaleFactor = getImplicitScaleFactor(VT);
2120 llvm_unreachable("Unexpected value type.");
2122 // Negative offsets require unscaled, 9-bit, signed immediate offsets.
2123 // Otherwise, we try using scaled, 12-bit, unsigned immediate offsets.
2124 bool UseScaled = true;
2125 if ((Addr.getOffset() < 0) || (Addr.getOffset() & (ScaleFactor - 1))) {
2130 static const unsigned OpcTable[4][6] = {
2131 { AArch64::STURBBi, AArch64::STURHHi, AArch64::STURWi, AArch64::STURXi,
2132 AArch64::STURSi, AArch64::STURDi },
2133 { AArch64::STRBBui, AArch64::STRHHui, AArch64::STRWui, AArch64::STRXui,
2134 AArch64::STRSui, AArch64::STRDui },
2135 { AArch64::STRBBroX, AArch64::STRHHroX, AArch64::STRWroX, AArch64::STRXroX,
2136 AArch64::STRSroX, AArch64::STRDroX },
2137 { AArch64::STRBBroW, AArch64::STRHHroW, AArch64::STRWroW, AArch64::STRXroW,
2138 AArch64::STRSroW, AArch64::STRDroW }
2142 bool VTIsi1 = false;
2143 bool UseRegOffset = Addr.isRegBase() && !Addr.getOffset() && Addr.getReg() &&
2144 Addr.getOffsetReg();
2145 unsigned Idx = UseRegOffset ? 2 : UseScaled ? 1 : 0;
2146 if (Addr.getExtendType() == AArch64_AM::UXTW ||
2147 Addr.getExtendType() == AArch64_AM::SXTW)
2150 switch (VT.SimpleTy) {
2151 default: llvm_unreachable("Unexpected value type.");
2152 case MVT::i1: VTIsi1 = true; LLVM_FALLTHROUGH;
2153 case MVT::i8: Opc = OpcTable[Idx][0]; break;
2154 case MVT::i16: Opc = OpcTable[Idx][1]; break;
2155 case MVT::i32: Opc = OpcTable[Idx][2]; break;
2156 case MVT::i64: Opc = OpcTable[Idx][3]; break;
2157 case MVT::f32: Opc = OpcTable[Idx][4]; break;
2158 case MVT::f64: Opc = OpcTable[Idx][5]; break;
2161 // Storing an i1 requires special handling.
2162 if (VTIsi1 && SrcReg != AArch64::WZR) {
2163 unsigned ANDReg = emitAnd_ri(MVT::i32, SrcReg, /*TODO:IsKill=*/false, 1);
2164 assert(ANDReg && "Unexpected AND instruction emission failure.");
2167 // Create the base instruction, then add the operands.
2168 const MCInstrDesc &II = TII.get(Opc);
2169 SrcReg = constrainOperandRegClass(II, SrcReg, II.getNumDefs());
2170 MachineInstrBuilder MIB =
2171 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II).addReg(SrcReg);
2172 addLoadStoreOperands(Addr, MIB, MachineMemOperand::MOStore, ScaleFactor, MMO);
2177 bool AArch64FastISel::selectStore(const Instruction *I) {
2179 const Value *Op0 = I->getOperand(0);
2180 // Verify we have a legal type before going any further. Currently, we handle
2181 // simple types that will directly fit in a register (i32/f32/i64/f64) or
2182 // those that can be sign or zero-extended to a basic operation (i1/i8/i16).
2183 if (!isTypeSupported(Op0->getType(), VT, /*IsVectorAllowed=*/true))
2186 const Value *PtrV = I->getOperand(1);
2187 if (TLI.supportSwiftError()) {
2188 // Swifterror values can come from either a function parameter with
2189 // swifterror attribute or an alloca with swifterror attribute.
2190 if (const Argument *Arg = dyn_cast<Argument>(PtrV)) {
2191 if (Arg->hasSwiftErrorAttr())
2195 if (const AllocaInst *Alloca = dyn_cast<AllocaInst>(PtrV)) {
2196 if (Alloca->isSwiftError())
2201 // Get the value to be stored into a register. Use the zero register directly
2202 // when possible to avoid an unnecessary copy and a wasted register.
2203 unsigned SrcReg = 0;
2204 if (const auto *CI = dyn_cast<ConstantInt>(Op0)) {
2206 SrcReg = (VT == MVT::i64) ? AArch64::XZR : AArch64::WZR;
2207 } else if (const auto *CF = dyn_cast<ConstantFP>(Op0)) {
2208 if (CF->isZero() && !CF->isNegative()) {
2209 VT = MVT::getIntegerVT(VT.getSizeInBits());
2210 SrcReg = (VT == MVT::i64) ? AArch64::XZR : AArch64::WZR;
2215 SrcReg = getRegForValue(Op0);
2220 auto *SI = cast<StoreInst>(I);
2222 // Try to emit a STLR for seq_cst/release.
2223 if (SI->isAtomic()) {
2224 AtomicOrdering Ord = SI->getOrdering();
2225 // The non-atomic instructions are sufficient for relaxed stores.
2226 if (isReleaseOrStronger(Ord)) {
2227 // The STLR addressing mode only supports a base reg; pass that directly.
2228 unsigned AddrReg = getRegForValue(PtrV);
2229 return emitStoreRelease(VT, SrcReg, AddrReg,
2230 createMachineMemOperandFor(I));
2234 // See if we can handle this address.
2236 if (!computeAddress(PtrV, Addr, Op0->getType()))
2239 if (!emitStore(VT, SrcReg, Addr, createMachineMemOperandFor(I)))
2244 static AArch64CC::CondCode getCompareCC(CmpInst::Predicate Pred) {
2246 case CmpInst::FCMP_ONE:
2247 case CmpInst::FCMP_UEQ:
2249 // AL is our "false" for now. The other two need more compares.
2250 return AArch64CC::AL;
2251 case CmpInst::ICMP_EQ:
2252 case CmpInst::FCMP_OEQ:
2253 return AArch64CC::EQ;
2254 case CmpInst::ICMP_SGT:
2255 case CmpInst::FCMP_OGT:
2256 return AArch64CC::GT;
2257 case CmpInst::ICMP_SGE:
2258 case CmpInst::FCMP_OGE:
2259 return AArch64CC::GE;
2260 case CmpInst::ICMP_UGT:
2261 case CmpInst::FCMP_UGT:
2262 return AArch64CC::HI;
2263 case CmpInst::FCMP_OLT:
2264 return AArch64CC::MI;
2265 case CmpInst::ICMP_ULE:
2266 case CmpInst::FCMP_OLE:
2267 return AArch64CC::LS;
2268 case CmpInst::FCMP_ORD:
2269 return AArch64CC::VC;
2270 case CmpInst::FCMP_UNO:
2271 return AArch64CC::VS;
2272 case CmpInst::FCMP_UGE:
2273 return AArch64CC::PL;
2274 case CmpInst::ICMP_SLT:
2275 case CmpInst::FCMP_ULT:
2276 return AArch64CC::LT;
2277 case CmpInst::ICMP_SLE:
2278 case CmpInst::FCMP_ULE:
2279 return AArch64CC::LE;
2280 case CmpInst::FCMP_UNE:
2281 case CmpInst::ICMP_NE:
2282 return AArch64CC::NE;
2283 case CmpInst::ICMP_UGE:
2284 return AArch64CC::HS;
2285 case CmpInst::ICMP_ULT:
2286 return AArch64CC::LO;
2290 /// Try to emit a combined compare-and-branch instruction.
2291 bool AArch64FastISel::emitCompareAndBranch(const BranchInst *BI) {
2292 // Speculation tracking/SLH assumes that optimized TB(N)Z/CB(N)Z instructions
2293 // will not be produced, as they are conditional branch instructions that do
2295 if (FuncInfo.MF->getFunction().hasFnAttribute(
2296 Attribute::SpeculativeLoadHardening))
2299 assert(isa<CmpInst>(BI->getCondition()) && "Expected cmp instruction");
2300 const CmpInst *CI = cast<CmpInst>(BI->getCondition());
2301 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
2303 const Value *LHS = CI->getOperand(0);
2304 const Value *RHS = CI->getOperand(1);
2307 if (!isTypeSupported(LHS->getType(), VT))
2310 unsigned BW = VT.getSizeInBits();
2314 MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
2315 MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
2317 // Try to take advantage of fallthrough opportunities.
2318 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
2319 std::swap(TBB, FBB);
2320 Predicate = CmpInst::getInversePredicate(Predicate);
2325 switch (Predicate) {
2328 case CmpInst::ICMP_EQ:
2329 case CmpInst::ICMP_NE:
2330 if (isa<Constant>(LHS) && cast<Constant>(LHS)->isNullValue())
2331 std::swap(LHS, RHS);
2333 if (!isa<Constant>(RHS) || !cast<Constant>(RHS)->isNullValue())
2336 if (const auto *AI = dyn_cast<BinaryOperator>(LHS))
2337 if (AI->getOpcode() == Instruction::And && isValueAvailable(AI)) {
2338 const Value *AndLHS = AI->getOperand(0);
2339 const Value *AndRHS = AI->getOperand(1);
2341 if (const auto *C = dyn_cast<ConstantInt>(AndLHS))
2342 if (C->getValue().isPowerOf2())
2343 std::swap(AndLHS, AndRHS);
2345 if (const auto *C = dyn_cast<ConstantInt>(AndRHS))
2346 if (C->getValue().isPowerOf2()) {
2347 TestBit = C->getValue().logBase2();
2355 IsCmpNE = Predicate == CmpInst::ICMP_NE;
2357 case CmpInst::ICMP_SLT:
2358 case CmpInst::ICMP_SGE:
2359 if (!isa<Constant>(RHS) || !cast<Constant>(RHS)->isNullValue())
2363 IsCmpNE = Predicate == CmpInst::ICMP_SLT;
2365 case CmpInst::ICMP_SGT:
2366 case CmpInst::ICMP_SLE:
2367 if (!isa<ConstantInt>(RHS))
2370 if (cast<ConstantInt>(RHS)->getValue() != APInt(BW, -1, true))
2374 IsCmpNE = Predicate == CmpInst::ICMP_SLE;
2378 static const unsigned OpcTable[2][2][2] = {
2379 { {AArch64::CBZW, AArch64::CBZX },
2380 {AArch64::CBNZW, AArch64::CBNZX} },
2381 { {AArch64::TBZW, AArch64::TBZX },
2382 {AArch64::TBNZW, AArch64::TBNZX} }
2385 bool IsBitTest = TestBit != -1;
2386 bool Is64Bit = BW == 64;
2387 if (TestBit < 32 && TestBit >= 0)
2390 unsigned Opc = OpcTable[IsBitTest][IsCmpNE][Is64Bit];
2391 const MCInstrDesc &II = TII.get(Opc);
2393 unsigned SrcReg = getRegForValue(LHS);
2396 bool SrcIsKill = hasTrivialKill(LHS);
2398 if (BW == 64 && !Is64Bit)
2399 SrcReg = fastEmitInst_extractsubreg(MVT::i32, SrcReg, SrcIsKill,
2402 if ((BW < 32) && !IsBitTest)
2403 SrcReg = emitIntExt(VT, SrcReg, MVT::i32, /*isZExt=*/true);
2405 // Emit the combined compare and branch instruction.
2406 SrcReg = constrainOperandRegClass(II, SrcReg, II.getNumDefs());
2407 MachineInstrBuilder MIB =
2408 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
2409 .addReg(SrcReg, getKillRegState(SrcIsKill));
2411 MIB.addImm(TestBit);
2414 finishCondBranch(BI->getParent(), TBB, FBB);
2418 bool AArch64FastISel::selectBranch(const Instruction *I) {
2419 const BranchInst *BI = cast<BranchInst>(I);
2420 if (BI->isUnconditional()) {
2421 MachineBasicBlock *MSucc = FuncInfo.MBBMap[BI->getSuccessor(0)];
2422 fastEmitBranch(MSucc, BI->getDebugLoc());
2426 MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
2427 MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
2429 if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
2430 if (CI->hasOneUse() && isValueAvailable(CI)) {
2431 // Try to optimize or fold the cmp.
2432 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
2433 switch (Predicate) {
2436 case CmpInst::FCMP_FALSE:
2437 fastEmitBranch(FBB, DbgLoc);
2439 case CmpInst::FCMP_TRUE:
2440 fastEmitBranch(TBB, DbgLoc);
2444 // Try to emit a combined compare-and-branch first.
2445 if (emitCompareAndBranch(BI))
2448 // Try to take advantage of fallthrough opportunities.
2449 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
2450 std::swap(TBB, FBB);
2451 Predicate = CmpInst::getInversePredicate(Predicate);
2455 if (!emitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
2458 // FCMP_UEQ and FCMP_ONE cannot be checked with a single branch
2460 AArch64CC::CondCode CC = getCompareCC(Predicate);
2461 AArch64CC::CondCode ExtraCC = AArch64CC::AL;
2462 switch (Predicate) {
2465 case CmpInst::FCMP_UEQ:
2466 ExtraCC = AArch64CC::EQ;
2469 case CmpInst::FCMP_ONE:
2470 ExtraCC = AArch64CC::MI;
2474 assert((CC != AArch64CC::AL) && "Unexpected condition code.");
2476 // Emit the extra branch for FCMP_UEQ and FCMP_ONE.
2477 if (ExtraCC != AArch64CC::AL) {
2478 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::Bcc))
2484 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::Bcc))
2488 finishCondBranch(BI->getParent(), TBB, FBB);
2491 } else if (const auto *CI = dyn_cast<ConstantInt>(BI->getCondition())) {
2492 uint64_t Imm = CI->getZExtValue();
2493 MachineBasicBlock *Target = (Imm == 0) ? FBB : TBB;
2494 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::B))
2497 // Obtain the branch probability and add the target to the successor list.
2499 auto BranchProbability = FuncInfo.BPI->getEdgeProbability(
2500 BI->getParent(), Target->getBasicBlock());
2501 FuncInfo.MBB->addSuccessor(Target, BranchProbability);
2503 FuncInfo.MBB->addSuccessorWithoutProb(Target);
2506 AArch64CC::CondCode CC = AArch64CC::NE;
2507 if (foldXALUIntrinsic(CC, I, BI->getCondition())) {
2508 // Fake request the condition, otherwise the intrinsic might be completely
2510 unsigned CondReg = getRegForValue(BI->getCondition());
2515 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::Bcc))
2519 finishCondBranch(BI->getParent(), TBB, FBB);
2524 unsigned CondReg = getRegForValue(BI->getCondition());
2527 bool CondRegIsKill = hasTrivialKill(BI->getCondition());
2529 // i1 conditions come as i32 values, test the lowest bit with tb(n)z.
2530 unsigned Opcode = AArch64::TBNZW;
2531 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
2532 std::swap(TBB, FBB);
2533 Opcode = AArch64::TBZW;
2536 const MCInstrDesc &II = TII.get(Opcode);
2537 unsigned ConstrainedCondReg
2538 = constrainOperandRegClass(II, CondReg, II.getNumDefs());
2539 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II)
2540 .addReg(ConstrainedCondReg, getKillRegState(CondRegIsKill))
2544 finishCondBranch(BI->getParent(), TBB, FBB);
2548 bool AArch64FastISel::selectIndirectBr(const Instruction *I) {
2549 const IndirectBrInst *BI = cast<IndirectBrInst>(I);
2550 unsigned AddrReg = getRegForValue(BI->getOperand(0));
2554 // Emit the indirect branch.
2555 const MCInstrDesc &II = TII.get(AArch64::BR);
2556 AddrReg = constrainOperandRegClass(II, AddrReg, II.getNumDefs());
2557 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II).addReg(AddrReg);
2559 // Make sure the CFG is up-to-date.
2560 for (auto *Succ : BI->successors())
2561 FuncInfo.MBB->addSuccessor(FuncInfo.MBBMap[Succ]);
2566 bool AArch64FastISel::selectCmp(const Instruction *I) {
2567 const CmpInst *CI = cast<CmpInst>(I);
2569 // Vectors of i1 are weird: bail out.
2570 if (CI->getType()->isVectorTy())
2573 // Try to optimize or fold the cmp.
2574 CmpInst::Predicate Predicate = optimizeCmpPredicate(CI);
2575 unsigned ResultReg = 0;
2576 switch (Predicate) {
2579 case CmpInst::FCMP_FALSE:
2580 ResultReg = createResultReg(&AArch64::GPR32RegClass);
2581 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
2582 TII.get(TargetOpcode::COPY), ResultReg)
2583 .addReg(AArch64::WZR, getKillRegState(true));
2585 case CmpInst::FCMP_TRUE:
2586 ResultReg = fastEmit_i(MVT::i32, MVT::i32, ISD::Constant, 1);
2591 updateValueMap(I, ResultReg);
2596 if (!emitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
2599 ResultReg = createResultReg(&AArch64::GPR32RegClass);
2601 // FCMP_UEQ and FCMP_ONE cannot be checked with a single instruction. These
2602 // condition codes are inverted, because they are used by CSINC.
2603 static unsigned CondCodeTable[2][2] = {
2604 { AArch64CC::NE, AArch64CC::VC },
2605 { AArch64CC::PL, AArch64CC::LE }
2607 unsigned *CondCodes = nullptr;
2608 switch (Predicate) {
2611 case CmpInst::FCMP_UEQ:
2612 CondCodes = &CondCodeTable[0][0];
2614 case CmpInst::FCMP_ONE:
2615 CondCodes = &CondCodeTable[1][0];
2620 unsigned TmpReg1 = createResultReg(&AArch64::GPR32RegClass);
2621 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::CSINCWr),
2623 .addReg(AArch64::WZR, getKillRegState(true))
2624 .addReg(AArch64::WZR, getKillRegState(true))
2625 .addImm(CondCodes[0]);
2626 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::CSINCWr),
2628 .addReg(TmpReg1, getKillRegState(true))
2629 .addReg(AArch64::WZR, getKillRegState(true))
2630 .addImm(CondCodes[1]);
2632 updateValueMap(I, ResultReg);
2636 // Now set a register based on the comparison.
2637 AArch64CC::CondCode CC = getCompareCC(Predicate);
2638 assert((CC != AArch64CC::AL) && "Unexpected condition code.");
2639 AArch64CC::CondCode invertedCC = getInvertedCondCode(CC);
2640 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::CSINCWr),
2642 .addReg(AArch64::WZR, getKillRegState(true))
2643 .addReg(AArch64::WZR, getKillRegState(true))
2644 .addImm(invertedCC);
2646 updateValueMap(I, ResultReg);
2650 /// Optimize selects of i1 if one of the operands has a 'true' or 'false'
2652 bool AArch64FastISel::optimizeSelect(const SelectInst *SI) {
2653 if (!SI->getType()->isIntegerTy(1))
2656 const Value *Src1Val, *Src2Val;
2658 bool NeedExtraOp = false;
2659 if (auto *CI = dyn_cast<ConstantInt>(SI->getTrueValue())) {
2661 Src1Val = SI->getCondition();
2662 Src2Val = SI->getFalseValue();
2663 Opc = AArch64::ORRWrr;
2665 assert(CI->isZero());
2666 Src1Val = SI->getFalseValue();
2667 Src2Val = SI->getCondition();
2668 Opc = AArch64::BICWrr;
2670 } else if (auto *CI = dyn_cast<ConstantInt>(SI->getFalseValue())) {
2672 Src1Val = SI->getCondition();
2673 Src2Val = SI->getTrueValue();
2674 Opc = AArch64::ORRWrr;
2677 assert(CI->isZero());
2678 Src1Val = SI->getCondition();
2679 Src2Val = SI->getTrueValue();
2680 Opc = AArch64::ANDWrr;
2687 unsigned Src1Reg = getRegForValue(Src1Val);
2690 bool Src1IsKill = hasTrivialKill(Src1Val);
2692 unsigned Src2Reg = getRegForValue(Src2Val);
2695 bool Src2IsKill = hasTrivialKill(Src2Val);
2698 Src1Reg = emitLogicalOp_ri(ISD::XOR, MVT::i32, Src1Reg, Src1IsKill, 1);
2701 unsigned ResultReg = fastEmitInst_rr(Opc, &AArch64::GPR32RegClass, Src1Reg,
2702 Src1IsKill, Src2Reg, Src2IsKill);
2703 updateValueMap(SI, ResultReg);
2707 bool AArch64FastISel::selectSelect(const Instruction *I) {
2708 assert(isa<SelectInst>(I) && "Expected a select instruction.");
2710 if (!isTypeSupported(I->getType(), VT))
2714 const TargetRegisterClass *RC;
2715 switch (VT.SimpleTy) {
2722 Opc = AArch64::CSELWr;
2723 RC = &AArch64::GPR32RegClass;
2726 Opc = AArch64::CSELXr;
2727 RC = &AArch64::GPR64RegClass;
2730 Opc = AArch64::FCSELSrrr;
2731 RC = &AArch64::FPR32RegClass;
2734 Opc = AArch64::FCSELDrrr;
2735 RC = &AArch64::FPR64RegClass;
2739 const SelectInst *SI = cast<SelectInst>(I);
2740 const Value *Cond = SI->getCondition();
2741 AArch64CC::CondCode CC = AArch64CC::NE;
2742 AArch64CC::CondCode ExtraCC = AArch64CC::AL;
2744 if (optimizeSelect(SI))
2747 // Try to pickup the flags, so we don't have to emit another compare.
2748 if (foldXALUIntrinsic(CC, I, Cond)) {
2749 // Fake request the condition to force emission of the XALU intrinsic.
2750 unsigned CondReg = getRegForValue(Cond);
2753 } else if (isa<CmpInst>(Cond) && cast<CmpInst>(Cond)->hasOneUse() &&
2754 isValueAvailable(Cond)) {
2755 const auto *Cmp = cast<CmpInst>(Cond);
2756 // Try to optimize or fold the cmp.
2757 CmpInst::Predicate Predicate = optimizeCmpPredicate(Cmp);
2758 const Value *FoldSelect = nullptr;
2759 switch (Predicate) {
2762 case CmpInst::FCMP_FALSE:
2763 FoldSelect = SI->getFalseValue();
2765 case CmpInst::FCMP_TRUE:
2766 FoldSelect = SI->getTrueValue();
2771 unsigned SrcReg = getRegForValue(FoldSelect);
2774 unsigned UseReg = lookUpRegForValue(SI);
2776 MRI.clearKillFlags(UseReg);
2778 updateValueMap(I, SrcReg);
2783 if (!emitCmp(Cmp->getOperand(0), Cmp->getOperand(1), Cmp->isUnsigned()))
2786 // FCMP_UEQ and FCMP_ONE cannot be checked with a single select instruction.
2787 CC = getCompareCC(Predicate);
2788 switch (Predicate) {
2791 case CmpInst::FCMP_UEQ:
2792 ExtraCC = AArch64CC::EQ;
2795 case CmpInst::FCMP_ONE:
2796 ExtraCC = AArch64CC::MI;
2800 assert((CC != AArch64CC::AL) && "Unexpected condition code.");
2802 unsigned CondReg = getRegForValue(Cond);
2805 bool CondIsKill = hasTrivialKill(Cond);
2807 const MCInstrDesc &II = TII.get(AArch64::ANDSWri);
2808 CondReg = constrainOperandRegClass(II, CondReg, 1);
2810 // Emit a TST instruction (ANDS wzr, reg, #imm).
2811 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II,
2813 .addReg(CondReg, getKillRegState(CondIsKill))
2814 .addImm(AArch64_AM::encodeLogicalImmediate(1, 32));
2817 unsigned Src1Reg = getRegForValue(SI->getTrueValue());
2818 bool Src1IsKill = hasTrivialKill(SI->getTrueValue());
2820 unsigned Src2Reg = getRegForValue(SI->getFalseValue());
2821 bool Src2IsKill = hasTrivialKill(SI->getFalseValue());
2823 if (!Src1Reg || !Src2Reg)
2826 if (ExtraCC != AArch64CC::AL) {
2827 Src2Reg = fastEmitInst_rri(Opc, RC, Src1Reg, Src1IsKill, Src2Reg,
2828 Src2IsKill, ExtraCC);
2831 unsigned ResultReg = fastEmitInst_rri(Opc, RC, Src1Reg, Src1IsKill, Src2Reg,
2833 updateValueMap(I, ResultReg);
2837 bool AArch64FastISel::selectFPExt(const Instruction *I) {
2838 Value *V = I->getOperand(0);
2839 if (!I->getType()->isDoubleTy() || !V->getType()->isFloatTy())
2842 unsigned Op = getRegForValue(V);
2846 unsigned ResultReg = createResultReg(&AArch64::FPR64RegClass);
2847 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::FCVTDSr),
2848 ResultReg).addReg(Op);
2849 updateValueMap(I, ResultReg);
2853 bool AArch64FastISel::selectFPTrunc(const Instruction *I) {
2854 Value *V = I->getOperand(0);
2855 if (!I->getType()->isFloatTy() || !V->getType()->isDoubleTy())
2858 unsigned Op = getRegForValue(V);
2862 unsigned ResultReg = createResultReg(&AArch64::FPR32RegClass);
2863 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::FCVTSDr),
2864 ResultReg).addReg(Op);
2865 updateValueMap(I, ResultReg);
2869 // FPToUI and FPToSI
2870 bool AArch64FastISel::selectFPToInt(const Instruction *I, bool Signed) {
2872 if (!isTypeLegal(I->getType(), DestVT) || DestVT.isVector())
2875 unsigned SrcReg = getRegForValue(I->getOperand(0));
2879 EVT SrcVT = TLI.getValueType(DL, I->getOperand(0)->getType(), true);
2880 if (SrcVT == MVT::f128 || SrcVT == MVT::f16)
2884 if (SrcVT == MVT::f64) {
2886 Opc = (DestVT == MVT::i32) ? AArch64::FCVTZSUWDr : AArch64::FCVTZSUXDr;
2888 Opc = (DestVT == MVT::i32) ? AArch64::FCVTZUUWDr : AArch64::FCVTZUUXDr;
2891 Opc = (DestVT == MVT::i32) ? AArch64::FCVTZSUWSr : AArch64::FCVTZSUXSr;
2893 Opc = (DestVT == MVT::i32) ? AArch64::FCVTZUUWSr : AArch64::FCVTZUUXSr;
2895 unsigned ResultReg = createResultReg(
2896 DestVT == MVT::i32 ? &AArch64::GPR32RegClass : &AArch64::GPR64RegClass);
2897 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
2899 updateValueMap(I, ResultReg);
2903 bool AArch64FastISel::selectIntToFP(const Instruction *I, bool Signed) {
2905 if (!isTypeLegal(I->getType(), DestVT) || DestVT.isVector())
2907 // Let regular ISEL handle FP16
2908 if (DestVT == MVT::f16)
2911 assert((DestVT == MVT::f32 || DestVT == MVT::f64) &&
2912 "Unexpected value type.");
2914 unsigned SrcReg = getRegForValue(I->getOperand(0));
2917 bool SrcIsKill = hasTrivialKill(I->getOperand(0));
2919 EVT SrcVT = TLI.getValueType(DL, I->getOperand(0)->getType(), true);
2921 // Handle sign-extension.
2922 if (SrcVT == MVT::i16 || SrcVT == MVT::i8 || SrcVT == MVT::i1) {
2924 emitIntExt(SrcVT.getSimpleVT(), SrcReg, MVT::i32, /*isZExt*/ !Signed);
2931 if (SrcVT == MVT::i64) {
2933 Opc = (DestVT == MVT::f32) ? AArch64::SCVTFUXSri : AArch64::SCVTFUXDri;
2935 Opc = (DestVT == MVT::f32) ? AArch64::UCVTFUXSri : AArch64::UCVTFUXDri;
2938 Opc = (DestVT == MVT::f32) ? AArch64::SCVTFUWSri : AArch64::SCVTFUWDri;
2940 Opc = (DestVT == MVT::f32) ? AArch64::UCVTFUWSri : AArch64::UCVTFUWDri;
2943 unsigned ResultReg = fastEmitInst_r(Opc, TLI.getRegClassFor(DestVT), SrcReg,
2945 updateValueMap(I, ResultReg);
2949 bool AArch64FastISel::fastLowerArguments() {
2950 if (!FuncInfo.CanLowerReturn)
2953 const Function *F = FuncInfo.Fn;
2957 CallingConv::ID CC = F->getCallingConv();
2958 if (CC != CallingConv::C && CC != CallingConv::Swift)
2961 if (Subtarget->hasCustomCallingConv())
2964 // Only handle simple cases of up to 8 GPR and FPR each.
2965 unsigned GPRCnt = 0;
2966 unsigned FPRCnt = 0;
2967 for (auto const &Arg : F->args()) {
2968 if (Arg.hasAttribute(Attribute::ByVal) ||
2969 Arg.hasAttribute(Attribute::InReg) ||
2970 Arg.hasAttribute(Attribute::StructRet) ||
2971 Arg.hasAttribute(Attribute::SwiftSelf) ||
2972 Arg.hasAttribute(Attribute::SwiftError) ||
2973 Arg.hasAttribute(Attribute::Nest))
2976 Type *ArgTy = Arg.getType();
2977 if (ArgTy->isStructTy() || ArgTy->isArrayTy())
2980 EVT ArgVT = TLI.getValueType(DL, ArgTy);
2981 if (!ArgVT.isSimple())
2984 MVT VT = ArgVT.getSimpleVT().SimpleTy;
2985 if (VT.isFloatingPoint() && !Subtarget->hasFPARMv8())
2988 if (VT.isVector() &&
2989 (!Subtarget->hasNEON() || !Subtarget->isLittleEndian()))
2992 if (VT >= MVT::i1 && VT <= MVT::i64)
2994 else if ((VT >= MVT::f16 && VT <= MVT::f64) || VT.is64BitVector() ||
2995 VT.is128BitVector())
3000 if (GPRCnt > 8 || FPRCnt > 8)
3004 static const MCPhysReg Registers[6][8] = {
3005 { AArch64::W0, AArch64::W1, AArch64::W2, AArch64::W3, AArch64::W4,
3006 AArch64::W5, AArch64::W6, AArch64::W7 },
3007 { AArch64::X0, AArch64::X1, AArch64::X2, AArch64::X3, AArch64::X4,
3008 AArch64::X5, AArch64::X6, AArch64::X7 },
3009 { AArch64::H0, AArch64::H1, AArch64::H2, AArch64::H3, AArch64::H4,
3010 AArch64::H5, AArch64::H6, AArch64::H7 },
3011 { AArch64::S0, AArch64::S1, AArch64::S2, AArch64::S3, AArch64::S4,
3012 AArch64::S5, AArch64::S6, AArch64::S7 },
3013 { AArch64::D0, AArch64::D1, AArch64::D2, AArch64::D3, AArch64::D4,
3014 AArch64::D5, AArch64::D6, AArch64::D7 },
3015 { AArch64::Q0, AArch64::Q1, AArch64::Q2, AArch64::Q3, AArch64::Q4,
3016 AArch64::Q5, AArch64::Q6, AArch64::Q7 }
3019 unsigned GPRIdx = 0;
3020 unsigned FPRIdx = 0;
3021 for (auto const &Arg : F->args()) {
3022 MVT VT = TLI.getSimpleValueType(DL, Arg.getType());
3024 const TargetRegisterClass *RC;
3025 if (VT >= MVT::i1 && VT <= MVT::i32) {
3026 SrcReg = Registers[0][GPRIdx++];
3027 RC = &AArch64::GPR32RegClass;
3029 } else if (VT == MVT::i64) {
3030 SrcReg = Registers[1][GPRIdx++];
3031 RC = &AArch64::GPR64RegClass;
3032 } else if (VT == MVT::f16) {
3033 SrcReg = Registers[2][FPRIdx++];
3034 RC = &AArch64::FPR16RegClass;
3035 } else if (VT == MVT::f32) {
3036 SrcReg = Registers[3][FPRIdx++];
3037 RC = &AArch64::FPR32RegClass;
3038 } else if ((VT == MVT::f64) || VT.is64BitVector()) {
3039 SrcReg = Registers[4][FPRIdx++];
3040 RC = &AArch64::FPR64RegClass;
3041 } else if (VT.is128BitVector()) {
3042 SrcReg = Registers[5][FPRIdx++];
3043 RC = &AArch64::FPR128RegClass;
3045 llvm_unreachable("Unexpected value type.");
3047 unsigned DstReg = FuncInfo.MF->addLiveIn(SrcReg, RC);
3048 // FIXME: Unfortunately it's necessary to emit a copy from the livein copy.
3049 // Without this, EmitLiveInCopies may eliminate the livein if its only
3050 // use is a bitcast (which isn't turned into an instruction).
3051 unsigned ResultReg = createResultReg(RC);
3052 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3053 TII.get(TargetOpcode::COPY), ResultReg)
3054 .addReg(DstReg, getKillRegState(true));
3055 updateValueMap(&Arg, ResultReg);
3060 bool AArch64FastISel::processCallArgs(CallLoweringInfo &CLI,
3061 SmallVectorImpl<MVT> &OutVTs,
3062 unsigned &NumBytes) {
3063 CallingConv::ID CC = CLI.CallConv;
3064 SmallVector<CCValAssign, 16> ArgLocs;
3065 CCState CCInfo(CC, false, *FuncInfo.MF, ArgLocs, *Context);
3066 CCInfo.AnalyzeCallOperands(OutVTs, CLI.OutFlags, CCAssignFnForCall(CC));
3068 // Get a count of how many bytes are to be pushed on the stack.
3069 NumBytes = CCInfo.getNextStackOffset();
3071 // Issue CALLSEQ_START
3072 unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
3073 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackDown))
3074 .addImm(NumBytes).addImm(0);
3076 // Process the args.
3077 for (CCValAssign &VA : ArgLocs) {
3078 const Value *ArgVal = CLI.OutVals[VA.getValNo()];
3079 MVT ArgVT = OutVTs[VA.getValNo()];
3081 unsigned ArgReg = getRegForValue(ArgVal);
3085 // Handle arg promotion: SExt, ZExt, AExt.
3086 switch (VA.getLocInfo()) {
3087 case CCValAssign::Full:
3089 case CCValAssign::SExt: {
3090 MVT DestVT = VA.getLocVT();
3092 ArgReg = emitIntExt(SrcVT, ArgReg, DestVT, /*isZExt=*/false);
3097 case CCValAssign::AExt:
3098 // Intentional fall-through.
3099 case CCValAssign::ZExt: {
3100 MVT DestVT = VA.getLocVT();
3102 ArgReg = emitIntExt(SrcVT, ArgReg, DestVT, /*isZExt=*/true);
3108 llvm_unreachable("Unknown arg promotion!");
3111 // Now copy/store arg to correct locations.
3112 if (VA.isRegLoc() && !VA.needsCustom()) {
3113 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3114 TII.get(TargetOpcode::COPY), VA.getLocReg()).addReg(ArgReg);
3115 CLI.OutRegs.push_back(VA.getLocReg());
3116 } else if (VA.needsCustom()) {
3117 // FIXME: Handle custom args.
3120 assert(VA.isMemLoc() && "Assuming store on stack.");
3122 // Don't emit stores for undef values.
3123 if (isa<UndefValue>(ArgVal))
3126 // Need to store on the stack.
3127 unsigned ArgSize = (ArgVT.getSizeInBits() + 7) / 8;
3129 unsigned BEAlign = 0;
3130 if (ArgSize < 8 && !Subtarget->isLittleEndian())
3131 BEAlign = 8 - ArgSize;
3134 Addr.setKind(Address::RegBase);
3135 Addr.setReg(AArch64::SP);
3136 Addr.setOffset(VA.getLocMemOffset() + BEAlign);
3138 unsigned Alignment = DL.getABITypeAlignment(ArgVal->getType());
3139 MachineMemOperand *MMO = FuncInfo.MF->getMachineMemOperand(
3140 MachinePointerInfo::getStack(*FuncInfo.MF, Addr.getOffset()),
3141 MachineMemOperand::MOStore, ArgVT.getStoreSize(), Alignment);
3143 if (!emitStore(ArgVT, ArgReg, Addr, MMO))
3150 bool AArch64FastISel::finishCall(CallLoweringInfo &CLI, MVT RetVT,
3151 unsigned NumBytes) {
3152 CallingConv::ID CC = CLI.CallConv;
3154 // Issue CALLSEQ_END
3155 unsigned AdjStackUp = TII.getCallFrameDestroyOpcode();
3156 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AdjStackUp))
3157 .addImm(NumBytes).addImm(0);
3159 // Now the return value.
3160 if (RetVT != MVT::isVoid) {
3161 SmallVector<CCValAssign, 16> RVLocs;
3162 CCState CCInfo(CC, false, *FuncInfo.MF, RVLocs, *Context);
3163 CCInfo.AnalyzeCallResult(RetVT, CCAssignFnForCall(CC));
3165 // Only handle a single return value.
3166 if (RVLocs.size() != 1)
3169 // Copy all of the result registers out of their specified physreg.
3170 MVT CopyVT = RVLocs[0].getValVT();
3172 // TODO: Handle big-endian results
3173 if (CopyVT.isVector() && !Subtarget->isLittleEndian())
3176 unsigned ResultReg = createResultReg(TLI.getRegClassFor(CopyVT));
3177 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3178 TII.get(TargetOpcode::COPY), ResultReg)
3179 .addReg(RVLocs[0].getLocReg());
3180 CLI.InRegs.push_back(RVLocs[0].getLocReg());
3182 CLI.ResultReg = ResultReg;
3183 CLI.NumResultRegs = 1;
3189 bool AArch64FastISel::fastLowerCall(CallLoweringInfo &CLI) {
3190 CallingConv::ID CC = CLI.CallConv;
3191 bool IsTailCall = CLI.IsTailCall;
3192 bool IsVarArg = CLI.IsVarArg;
3193 const Value *Callee = CLI.Callee;
3194 MCSymbol *Symbol = CLI.Symbol;
3196 if (!Callee && !Symbol)
3199 // Allow SelectionDAG isel to handle tail calls.
3203 // FIXME: we could and should support this, but for now correctness at -O0 is
3205 if (Subtarget->isTargetILP32())
3208 CodeModel::Model CM = TM.getCodeModel();
3209 // Only support the small-addressing and large code models.
3210 if (CM != CodeModel::Large && !Subtarget->useSmallAddressing())
3213 // FIXME: Add large code model support for ELF.
3214 if (CM == CodeModel::Large && !Subtarget->isTargetMachO())
3217 // Let SDISel handle vararg functions.
3221 // FIXME: Only handle *simple* calls for now.
3223 if (CLI.RetTy->isVoidTy())
3224 RetVT = MVT::isVoid;
3225 else if (!isTypeLegal(CLI.RetTy, RetVT))
3228 for (auto Flag : CLI.OutFlags)
3229 if (Flag.isInReg() || Flag.isSRet() || Flag.isNest() || Flag.isByVal() ||
3230 Flag.isSwiftSelf() || Flag.isSwiftError())
3233 // Set up the argument vectors.
3234 SmallVector<MVT, 16> OutVTs;
3235 OutVTs.reserve(CLI.OutVals.size());
3237 for (auto *Val : CLI.OutVals) {
3239 if (!isTypeLegal(Val->getType(), VT) &&
3240 !(VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16))
3243 // We don't handle vector parameters yet.
3244 if (VT.isVector() || VT.getSizeInBits() > 64)
3247 OutVTs.push_back(VT);
3251 if (Callee && !computeCallAddress(Callee, Addr))
3254 // Handle the arguments now that we've gotten them.
3256 if (!processCallArgs(CLI, OutVTs, NumBytes))
3259 const AArch64RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3260 if (RegInfo->isAnyArgRegReserved(*MF))
3261 RegInfo->emitReservedArgRegCallError(*MF);
3264 MachineInstrBuilder MIB;
3265 if (Subtarget->useSmallAddressing()) {
3266 const MCInstrDesc &II = TII.get(Addr.getReg() ? AArch64::BLR : AArch64::BL);
3267 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II);
3269 MIB.addSym(Symbol, 0);
3270 else if (Addr.getGlobalValue())
3271 MIB.addGlobalAddress(Addr.getGlobalValue(), 0, 0);
3272 else if (Addr.getReg()) {
3273 unsigned Reg = constrainOperandRegClass(II, Addr.getReg(), 0);
3278 unsigned CallReg = 0;
3280 unsigned ADRPReg = createResultReg(&AArch64::GPR64commonRegClass);
3281 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::ADRP),
3283 .addSym(Symbol, AArch64II::MO_GOT | AArch64II::MO_PAGE);
3285 CallReg = createResultReg(&AArch64::GPR64RegClass);
3286 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3287 TII.get(AArch64::LDRXui), CallReg)
3290 AArch64II::MO_GOT | AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
3291 } else if (Addr.getGlobalValue())
3292 CallReg = materializeGV(Addr.getGlobalValue());
3293 else if (Addr.getReg())
3294 CallReg = Addr.getReg();
3299 const MCInstrDesc &II = TII.get(AArch64::BLR);
3300 CallReg = constrainOperandRegClass(II, CallReg, 0);
3301 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II).addReg(CallReg);
3304 // Add implicit physical register uses to the call.
3305 for (auto Reg : CLI.OutRegs)
3306 MIB.addReg(Reg, RegState::Implicit);
3308 // Add a register mask with the call-preserved registers.
3309 // Proper defs for return values will be added by setPhysRegsDeadExcept().
3310 MIB.addRegMask(TRI.getCallPreservedMask(*FuncInfo.MF, CC));
3314 // Finish off the call including any return values.
3315 return finishCall(CLI, RetVT, NumBytes);
3318 bool AArch64FastISel::isMemCpySmall(uint64_t Len, unsigned Alignment) {
3320 return Len / Alignment <= 4;
3325 bool AArch64FastISel::tryEmitSmallMemCpy(Address Dest, Address Src,
3326 uint64_t Len, unsigned Alignment) {
3327 // Make sure we don't bloat code by inlining very large memcpy's.
3328 if (!isMemCpySmall(Len, Alignment))
3331 int64_t UnscaledOffset = 0;
3332 Address OrigDest = Dest;
3333 Address OrigSrc = Src;
3337 if (!Alignment || Alignment >= 8) {
3348 // Bound based on alignment.
3349 if (Len >= 4 && Alignment == 4)
3351 else if (Len >= 2 && Alignment == 2)
3358 unsigned ResultReg = emitLoad(VT, VT, Src);
3362 if (!emitStore(VT, ResultReg, Dest))
3365 int64_t Size = VT.getSizeInBits() / 8;
3367 UnscaledOffset += Size;
3369 // We need to recompute the unscaled offset for each iteration.
3370 Dest.setOffset(OrigDest.getOffset() + UnscaledOffset);
3371 Src.setOffset(OrigSrc.getOffset() + UnscaledOffset);
3377 /// Check if it is possible to fold the condition from the XALU intrinsic
3378 /// into the user. The condition code will only be updated on success.
3379 bool AArch64FastISel::foldXALUIntrinsic(AArch64CC::CondCode &CC,
3380 const Instruction *I,
3381 const Value *Cond) {
3382 if (!isa<ExtractValueInst>(Cond))
3385 const auto *EV = cast<ExtractValueInst>(Cond);
3386 if (!isa<IntrinsicInst>(EV->getAggregateOperand()))
3389 const auto *II = cast<IntrinsicInst>(EV->getAggregateOperand());
3391 const Function *Callee = II->getCalledFunction();
3393 cast<StructType>(Callee->getReturnType())->getTypeAtIndex(0U);
3394 if (!isTypeLegal(RetTy, RetVT))
3397 if (RetVT != MVT::i32 && RetVT != MVT::i64)
3400 const Value *LHS = II->getArgOperand(0);
3401 const Value *RHS = II->getArgOperand(1);
3403 // Canonicalize immediate to the RHS.
3404 if (isa<ConstantInt>(LHS) && !isa<ConstantInt>(RHS) &&
3405 isCommutativeIntrinsic(II))
3406 std::swap(LHS, RHS);
3408 // Simplify multiplies.
3409 Intrinsic::ID IID = II->getIntrinsicID();
3413 case Intrinsic::smul_with_overflow:
3414 if (const auto *C = dyn_cast<ConstantInt>(RHS))
3415 if (C->getValue() == 2)
3416 IID = Intrinsic::sadd_with_overflow;
3418 case Intrinsic::umul_with_overflow:
3419 if (const auto *C = dyn_cast<ConstantInt>(RHS))
3420 if (C->getValue() == 2)
3421 IID = Intrinsic::uadd_with_overflow;
3425 AArch64CC::CondCode TmpCC;
3429 case Intrinsic::sadd_with_overflow:
3430 case Intrinsic::ssub_with_overflow:
3431 TmpCC = AArch64CC::VS;
3433 case Intrinsic::uadd_with_overflow:
3434 TmpCC = AArch64CC::HS;
3436 case Intrinsic::usub_with_overflow:
3437 TmpCC = AArch64CC::LO;
3439 case Intrinsic::smul_with_overflow:
3440 case Intrinsic::umul_with_overflow:
3441 TmpCC = AArch64CC::NE;
3445 // Check if both instructions are in the same basic block.
3446 if (!isValueAvailable(II))
3449 // Make sure nothing is in the way
3450 BasicBlock::const_iterator Start(I);
3451 BasicBlock::const_iterator End(II);
3452 for (auto Itr = std::prev(Start); Itr != End; --Itr) {
3453 // We only expect extractvalue instructions between the intrinsic and the
3454 // instruction to be selected.
3455 if (!isa<ExtractValueInst>(Itr))
3458 // Check that the extractvalue operand comes from the intrinsic.
3459 const auto *EVI = cast<ExtractValueInst>(Itr);
3460 if (EVI->getAggregateOperand() != II)
3468 bool AArch64FastISel::fastLowerIntrinsicCall(const IntrinsicInst *II) {
3469 // FIXME: Handle more intrinsics.
3470 switch (II->getIntrinsicID()) {
3471 default: return false;
3472 case Intrinsic::frameaddress: {
3473 MachineFrameInfo &MFI = FuncInfo.MF->getFrameInfo();
3474 MFI.setFrameAddressIsTaken(true);
3476 const AArch64RegisterInfo *RegInfo = Subtarget->getRegisterInfo();
3477 Register FramePtr = RegInfo->getFrameRegister(*(FuncInfo.MF));
3478 Register SrcReg = MRI.createVirtualRegister(&AArch64::GPR64RegClass);
3479 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3480 TII.get(TargetOpcode::COPY), SrcReg).addReg(FramePtr);
3481 // Recursively load frame address
3487 unsigned Depth = cast<ConstantInt>(II->getOperand(0))->getZExtValue();
3489 DestReg = fastEmitInst_ri(AArch64::LDRXui, &AArch64::GPR64RegClass,
3490 SrcReg, /*IsKill=*/true, 0);
3491 assert(DestReg && "Unexpected LDR instruction emission failure.");
3495 updateValueMap(II, SrcReg);
3498 case Intrinsic::sponentry: {
3499 MachineFrameInfo &MFI = FuncInfo.MF->getFrameInfo();
3501 // SP = FP + Fixed Object + 16
3502 int FI = MFI.CreateFixedObject(4, 0, false);
3503 unsigned ResultReg = createResultReg(&AArch64::GPR64spRegClass);
3504 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3505 TII.get(AArch64::ADDXri), ResultReg)
3510 updateValueMap(II, ResultReg);
3513 case Intrinsic::memcpy:
3514 case Intrinsic::memmove: {
3515 const auto *MTI = cast<MemTransferInst>(II);
3516 // Don't handle volatile.
3517 if (MTI->isVolatile())
3520 // Disable inlining for memmove before calls to ComputeAddress. Otherwise,
3521 // we would emit dead code because we don't currently handle memmoves.
3522 bool IsMemCpy = (II->getIntrinsicID() == Intrinsic::memcpy);
3523 if (isa<ConstantInt>(MTI->getLength()) && IsMemCpy) {
3524 // Small memcpy's are common enough that we want to do them without a call
3526 uint64_t Len = cast<ConstantInt>(MTI->getLength())->getZExtValue();
3527 unsigned Alignment = MinAlign(MTI->getDestAlignment(),
3528 MTI->getSourceAlignment());
3529 if (isMemCpySmall(Len, Alignment)) {
3531 if (!computeAddress(MTI->getRawDest(), Dest) ||
3532 !computeAddress(MTI->getRawSource(), Src))
3534 if (tryEmitSmallMemCpy(Dest, Src, Len, Alignment))
3539 if (!MTI->getLength()->getType()->isIntegerTy(64))
3542 if (MTI->getSourceAddressSpace() > 255 || MTI->getDestAddressSpace() > 255)
3543 // Fast instruction selection doesn't support the special
3547 const char *IntrMemName = isa<MemCpyInst>(II) ? "memcpy" : "memmove";
3548 return lowerCallTo(II, IntrMemName, II->getNumArgOperands() - 1);
3550 case Intrinsic::memset: {
3551 const MemSetInst *MSI = cast<MemSetInst>(II);
3552 // Don't handle volatile.
3553 if (MSI->isVolatile())
3556 if (!MSI->getLength()->getType()->isIntegerTy(64))
3559 if (MSI->getDestAddressSpace() > 255)
3560 // Fast instruction selection doesn't support the special
3564 return lowerCallTo(II, "memset", II->getNumArgOperands() - 1);
3566 case Intrinsic::sin:
3567 case Intrinsic::cos:
3568 case Intrinsic::pow: {
3570 if (!isTypeLegal(II->getType(), RetVT))
3573 if (RetVT != MVT::f32 && RetVT != MVT::f64)
3576 static const RTLIB::Libcall LibCallTable[3][2] = {
3577 { RTLIB::SIN_F32, RTLIB::SIN_F64 },
3578 { RTLIB::COS_F32, RTLIB::COS_F64 },
3579 { RTLIB::POW_F32, RTLIB::POW_F64 }
3582 bool Is64Bit = RetVT == MVT::f64;
3583 switch (II->getIntrinsicID()) {
3585 llvm_unreachable("Unexpected intrinsic.");
3586 case Intrinsic::sin:
3587 LC = LibCallTable[0][Is64Bit];
3589 case Intrinsic::cos:
3590 LC = LibCallTable[1][Is64Bit];
3592 case Intrinsic::pow:
3593 LC = LibCallTable[2][Is64Bit];
3598 Args.reserve(II->getNumArgOperands());
3600 // Populate the argument list.
3601 for (auto &Arg : II->arg_operands()) {
3604 Entry.Ty = Arg->getType();
3605 Args.push_back(Entry);
3608 CallLoweringInfo CLI;
3609 MCContext &Ctx = MF->getContext();
3610 CLI.setCallee(DL, Ctx, TLI.getLibcallCallingConv(LC), II->getType(),
3611 TLI.getLibcallName(LC), std::move(Args));
3612 if (!lowerCallTo(CLI))
3614 updateValueMap(II, CLI.ResultReg);
3617 case Intrinsic::fabs: {
3619 if (!isTypeLegal(II->getType(), VT))
3623 switch (VT.SimpleTy) {
3627 Opc = AArch64::FABSSr;
3630 Opc = AArch64::FABSDr;
3633 unsigned SrcReg = getRegForValue(II->getOperand(0));
3636 bool SrcRegIsKill = hasTrivialKill(II->getOperand(0));
3637 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
3638 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
3639 .addReg(SrcReg, getKillRegState(SrcRegIsKill));
3640 updateValueMap(II, ResultReg);
3643 case Intrinsic::trap:
3644 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::BRK))
3647 case Intrinsic::debugtrap: {
3648 if (Subtarget->isTargetWindows()) {
3649 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::BRK))
3656 case Intrinsic::sqrt: {
3657 Type *RetTy = II->getCalledFunction()->getReturnType();
3660 if (!isTypeLegal(RetTy, VT))
3663 unsigned Op0Reg = getRegForValue(II->getOperand(0));
3666 bool Op0IsKill = hasTrivialKill(II->getOperand(0));
3668 unsigned ResultReg = fastEmit_r(VT, VT, ISD::FSQRT, Op0Reg, Op0IsKill);
3672 updateValueMap(II, ResultReg);
3675 case Intrinsic::sadd_with_overflow:
3676 case Intrinsic::uadd_with_overflow:
3677 case Intrinsic::ssub_with_overflow:
3678 case Intrinsic::usub_with_overflow:
3679 case Intrinsic::smul_with_overflow:
3680 case Intrinsic::umul_with_overflow: {
3681 // This implements the basic lowering of the xalu with overflow intrinsics.
3682 const Function *Callee = II->getCalledFunction();
3683 auto *Ty = cast<StructType>(Callee->getReturnType());
3684 Type *RetTy = Ty->getTypeAtIndex(0U);
3687 if (!isTypeLegal(RetTy, VT))
3690 if (VT != MVT::i32 && VT != MVT::i64)
3693 const Value *LHS = II->getArgOperand(0);
3694 const Value *RHS = II->getArgOperand(1);
3695 // Canonicalize immediate to the RHS.
3696 if (isa<ConstantInt>(LHS) && !isa<ConstantInt>(RHS) &&
3697 isCommutativeIntrinsic(II))
3698 std::swap(LHS, RHS);
3700 // Simplify multiplies.
3701 Intrinsic::ID IID = II->getIntrinsicID();
3705 case Intrinsic::smul_with_overflow:
3706 if (const auto *C = dyn_cast<ConstantInt>(RHS))
3707 if (C->getValue() == 2) {
3708 IID = Intrinsic::sadd_with_overflow;
3712 case Intrinsic::umul_with_overflow:
3713 if (const auto *C = dyn_cast<ConstantInt>(RHS))
3714 if (C->getValue() == 2) {
3715 IID = Intrinsic::uadd_with_overflow;
3721 unsigned ResultReg1 = 0, ResultReg2 = 0, MulReg = 0;
3722 AArch64CC::CondCode CC = AArch64CC::Invalid;
3724 default: llvm_unreachable("Unexpected intrinsic!");
3725 case Intrinsic::sadd_with_overflow:
3726 ResultReg1 = emitAdd(VT, LHS, RHS, /*SetFlags=*/true);
3729 case Intrinsic::uadd_with_overflow:
3730 ResultReg1 = emitAdd(VT, LHS, RHS, /*SetFlags=*/true);
3733 case Intrinsic::ssub_with_overflow:
3734 ResultReg1 = emitSub(VT, LHS, RHS, /*SetFlags=*/true);
3737 case Intrinsic::usub_with_overflow:
3738 ResultReg1 = emitSub(VT, LHS, RHS, /*SetFlags=*/true);
3741 case Intrinsic::smul_with_overflow: {
3743 unsigned LHSReg = getRegForValue(LHS);
3746 bool LHSIsKill = hasTrivialKill(LHS);
3748 unsigned RHSReg = getRegForValue(RHS);
3751 bool RHSIsKill = hasTrivialKill(RHS);
3753 if (VT == MVT::i32) {
3754 MulReg = emitSMULL_rr(MVT::i64, LHSReg, LHSIsKill, RHSReg, RHSIsKill);
3755 unsigned ShiftReg = emitLSR_ri(MVT::i64, MVT::i64, MulReg,
3756 /*IsKill=*/false, 32);
3757 MulReg = fastEmitInst_extractsubreg(VT, MulReg, /*IsKill=*/true,
3759 ShiftReg = fastEmitInst_extractsubreg(VT, ShiftReg, /*IsKill=*/true,
3761 emitSubs_rs(VT, ShiftReg, /*IsKill=*/true, MulReg, /*IsKill=*/false,
3762 AArch64_AM::ASR, 31, /*WantResult=*/false);
3764 assert(VT == MVT::i64 && "Unexpected value type.");
3765 // LHSReg and RHSReg cannot be killed by this Mul, since they are
3766 // reused in the next instruction.
3767 MulReg = emitMul_rr(VT, LHSReg, /*IsKill=*/false, RHSReg,
3769 unsigned SMULHReg = fastEmit_rr(VT, VT, ISD::MULHS, LHSReg, LHSIsKill,
3771 emitSubs_rs(VT, SMULHReg, /*IsKill=*/true, MulReg, /*IsKill=*/false,
3772 AArch64_AM::ASR, 63, /*WantResult=*/false);
3776 case Intrinsic::umul_with_overflow: {
3778 unsigned LHSReg = getRegForValue(LHS);
3781 bool LHSIsKill = hasTrivialKill(LHS);
3783 unsigned RHSReg = getRegForValue(RHS);
3786 bool RHSIsKill = hasTrivialKill(RHS);
3788 if (VT == MVT::i32) {
3789 MulReg = emitUMULL_rr(MVT::i64, LHSReg, LHSIsKill, RHSReg, RHSIsKill);
3790 emitSubs_rs(MVT::i64, AArch64::XZR, /*IsKill=*/true, MulReg,
3791 /*IsKill=*/false, AArch64_AM::LSR, 32,
3792 /*WantResult=*/false);
3793 MulReg = fastEmitInst_extractsubreg(VT, MulReg, /*IsKill=*/true,
3796 assert(VT == MVT::i64 && "Unexpected value type.");
3797 // LHSReg and RHSReg cannot be killed by this Mul, since they are
3798 // reused in the next instruction.
3799 MulReg = emitMul_rr(VT, LHSReg, /*IsKill=*/false, RHSReg,
3801 unsigned UMULHReg = fastEmit_rr(VT, VT, ISD::MULHU, LHSReg, LHSIsKill,
3803 emitSubs_rr(VT, AArch64::XZR, /*IsKill=*/true, UMULHReg,
3804 /*IsKill=*/false, /*WantResult=*/false);
3811 ResultReg1 = createResultReg(TLI.getRegClassFor(VT));
3812 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3813 TII.get(TargetOpcode::COPY), ResultReg1).addReg(MulReg);
3819 ResultReg2 = fastEmitInst_rri(AArch64::CSINCWr, &AArch64::GPR32RegClass,
3820 AArch64::WZR, /*IsKill=*/true, AArch64::WZR,
3821 /*IsKill=*/true, getInvertedCondCode(CC));
3823 assert((ResultReg1 + 1) == ResultReg2 &&
3824 "Nonconsecutive result registers.");
3825 updateValueMap(II, ResultReg1, 2);
3832 bool AArch64FastISel::selectRet(const Instruction *I) {
3833 const ReturnInst *Ret = cast<ReturnInst>(I);
3834 const Function &F = *I->getParent()->getParent();
3836 if (!FuncInfo.CanLowerReturn)
3839 // FIXME: in principle it could. Mostly just a case of zero extending outgoing
3841 if (Subtarget->isTargetILP32())
3847 if (TLI.supportSwiftError() &&
3848 F.getAttributes().hasAttrSomewhere(Attribute::SwiftError))
3851 if (TLI.supportSplitCSR(FuncInfo.MF))
3854 // Build a list of return value registers.
3855 SmallVector<unsigned, 4> RetRegs;
3857 if (Ret->getNumOperands() > 0) {
3858 CallingConv::ID CC = F.getCallingConv();
3859 SmallVector<ISD::OutputArg, 4> Outs;
3860 GetReturnInfo(CC, F.getReturnType(), F.getAttributes(), Outs, TLI, DL);
3862 // Analyze operands of the call, assigning locations to each operand.
3863 SmallVector<CCValAssign, 16> ValLocs;
3864 CCState CCInfo(CC, F.isVarArg(), *FuncInfo.MF, ValLocs, I->getContext());
3865 CCAssignFn *RetCC = CC == CallingConv::WebKit_JS ? RetCC_AArch64_WebKit_JS
3866 : RetCC_AArch64_AAPCS;
3867 CCInfo.AnalyzeReturn(Outs, RetCC);
3869 // Only handle a single return value for now.
3870 if (ValLocs.size() != 1)
3873 CCValAssign &VA = ValLocs[0];
3874 const Value *RV = Ret->getOperand(0);
3876 // Don't bother handling odd stuff for now.
3877 if ((VA.getLocInfo() != CCValAssign::Full) &&
3878 (VA.getLocInfo() != CCValAssign::BCvt))
3881 // Only handle register returns for now.
3885 unsigned Reg = getRegForValue(RV);
3889 unsigned SrcReg = Reg + VA.getValNo();
3890 Register DestReg = VA.getLocReg();
3891 // Avoid a cross-class copy. This is very unlikely.
3892 if (!MRI.getRegClass(SrcReg)->contains(DestReg))
3895 EVT RVEVT = TLI.getValueType(DL, RV->getType());
3896 if (!RVEVT.isSimple())
3899 // Vectors (of > 1 lane) in big endian need tricky handling.
3900 if (RVEVT.isVector() && RVEVT.getVectorNumElements() > 1 &&
3901 !Subtarget->isLittleEndian())
3904 MVT RVVT = RVEVT.getSimpleVT();
3905 if (RVVT == MVT::f128)
3908 MVT DestVT = VA.getValVT();
3909 // Special handling for extended integers.
3910 if (RVVT != DestVT) {
3911 if (RVVT != MVT::i1 && RVVT != MVT::i8 && RVVT != MVT::i16)
3914 if (!Outs[0].Flags.isZExt() && !Outs[0].Flags.isSExt())
3917 bool IsZExt = Outs[0].Flags.isZExt();
3918 SrcReg = emitIntExt(RVVT, SrcReg, DestVT, IsZExt);
3924 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3925 TII.get(TargetOpcode::COPY), DestReg).addReg(SrcReg);
3927 // Add register to return instruction.
3928 RetRegs.push_back(VA.getLocReg());
3931 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3932 TII.get(AArch64::RET_ReallyLR));
3933 for (unsigned RetReg : RetRegs)
3934 MIB.addReg(RetReg, RegState::Implicit);
3938 bool AArch64FastISel::selectTrunc(const Instruction *I) {
3939 Type *DestTy = I->getType();
3940 Value *Op = I->getOperand(0);
3941 Type *SrcTy = Op->getType();
3943 EVT SrcEVT = TLI.getValueType(DL, SrcTy, true);
3944 EVT DestEVT = TLI.getValueType(DL, DestTy, true);
3945 if (!SrcEVT.isSimple())
3947 if (!DestEVT.isSimple())
3950 MVT SrcVT = SrcEVT.getSimpleVT();
3951 MVT DestVT = DestEVT.getSimpleVT();
3953 if (SrcVT != MVT::i64 && SrcVT != MVT::i32 && SrcVT != MVT::i16 &&
3956 if (DestVT != MVT::i32 && DestVT != MVT::i16 && DestVT != MVT::i8 &&
3960 unsigned SrcReg = getRegForValue(Op);
3963 bool SrcIsKill = hasTrivialKill(Op);
3965 // If we're truncating from i64 to a smaller non-legal type then generate an
3966 // AND. Otherwise, we know the high bits are undefined and a truncate only
3967 // generate a COPY. We cannot mark the source register also as result
3968 // register, because this can incorrectly transfer the kill flag onto the
3971 if (SrcVT == MVT::i64) {
3973 switch (DestVT.SimpleTy) {
3975 // Trunc i64 to i32 is handled by the target-independent fast-isel.
3987 // Issue an extract_subreg to get the lower 32-bits.
3988 unsigned Reg32 = fastEmitInst_extractsubreg(MVT::i32, SrcReg, SrcIsKill,
3990 // Create the AND instruction which performs the actual truncation.
3991 ResultReg = emitAnd_ri(MVT::i32, Reg32, /*IsKill=*/true, Mask);
3992 assert(ResultReg && "Unexpected AND instruction emission failure.");
3994 ResultReg = createResultReg(&AArch64::GPR32RegClass);
3995 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
3996 TII.get(TargetOpcode::COPY), ResultReg)
3997 .addReg(SrcReg, getKillRegState(SrcIsKill));
4000 updateValueMap(I, ResultReg);
4004 unsigned AArch64FastISel::emiti1Ext(unsigned SrcReg, MVT DestVT, bool IsZExt) {
4005 assert((DestVT == MVT::i8 || DestVT == MVT::i16 || DestVT == MVT::i32 ||
4006 DestVT == MVT::i64) &&
4007 "Unexpected value type.");
4008 // Handle i8 and i16 as i32.
4009 if (DestVT == MVT::i8 || DestVT == MVT::i16)
4013 unsigned ResultReg = emitAnd_ri(MVT::i32, SrcReg, /*TODO:IsKill=*/false, 1);
4014 assert(ResultReg && "Unexpected AND instruction emission failure.");
4015 if (DestVT == MVT::i64) {
4016 // We're ZExt i1 to i64. The ANDWri Wd, Ws, #1 implicitly clears the
4017 // upper 32 bits. Emit a SUBREG_TO_REG to extend from Wd to Xd.
4018 Register Reg64 = MRI.createVirtualRegister(&AArch64::GPR64RegClass);
4019 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4020 TII.get(AArch64::SUBREG_TO_REG), Reg64)
4023 .addImm(AArch64::sub_32);
4028 if (DestVT == MVT::i64) {
4029 // FIXME: We're SExt i1 to i64.
4032 return fastEmitInst_rii(AArch64::SBFMWri, &AArch64::GPR32RegClass, SrcReg,
4033 /*TODO:IsKill=*/false, 0, 0);
4037 unsigned AArch64FastISel::emitMul_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
4038 unsigned Op1, bool Op1IsKill) {
4040 switch (RetVT.SimpleTy) {
4046 Opc = AArch64::MADDWrrr; ZReg = AArch64::WZR; break;
4048 Opc = AArch64::MADDXrrr; ZReg = AArch64::XZR; break;
4051 const TargetRegisterClass *RC =
4052 (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4053 return fastEmitInst_rrr(Opc, RC, Op0, Op0IsKill, Op1, Op1IsKill,
4054 /*IsKill=*/ZReg, true);
4057 unsigned AArch64FastISel::emitSMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
4058 unsigned Op1, bool Op1IsKill) {
4059 if (RetVT != MVT::i64)
4062 return fastEmitInst_rrr(AArch64::SMADDLrrr, &AArch64::GPR64RegClass,
4063 Op0, Op0IsKill, Op1, Op1IsKill,
4064 AArch64::XZR, /*IsKill=*/true);
4067 unsigned AArch64FastISel::emitUMULL_rr(MVT RetVT, unsigned Op0, bool Op0IsKill,
4068 unsigned Op1, bool Op1IsKill) {
4069 if (RetVT != MVT::i64)
4072 return fastEmitInst_rrr(AArch64::UMADDLrrr, &AArch64::GPR64RegClass,
4073 Op0, Op0IsKill, Op1, Op1IsKill,
4074 AArch64::XZR, /*IsKill=*/true);
4077 unsigned AArch64FastISel::emitLSL_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
4078 unsigned Op1Reg, bool Op1IsKill) {
4080 bool NeedTrunc = false;
4082 switch (RetVT.SimpleTy) {
4084 case MVT::i8: Opc = AArch64::LSLVWr; NeedTrunc = true; Mask = 0xff; break;
4085 case MVT::i16: Opc = AArch64::LSLVWr; NeedTrunc = true; Mask = 0xffff; break;
4086 case MVT::i32: Opc = AArch64::LSLVWr; break;
4087 case MVT::i64: Opc = AArch64::LSLVXr; break;
4090 const TargetRegisterClass *RC =
4091 (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4093 Op1Reg = emitAnd_ri(MVT::i32, Op1Reg, Op1IsKill, Mask);
4096 unsigned ResultReg = fastEmitInst_rr(Opc, RC, Op0Reg, Op0IsKill, Op1Reg,
4099 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
4103 unsigned AArch64FastISel::emitLSL_ri(MVT RetVT, MVT SrcVT, unsigned Op0,
4104 bool Op0IsKill, uint64_t Shift,
4106 assert(RetVT.SimpleTy >= SrcVT.SimpleTy &&
4107 "Unexpected source/return type pair.");
4108 assert((SrcVT == MVT::i1 || SrcVT == MVT::i8 || SrcVT == MVT::i16 ||
4109 SrcVT == MVT::i32 || SrcVT == MVT::i64) &&
4110 "Unexpected source value type.");
4111 assert((RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32 ||
4112 RetVT == MVT::i64) && "Unexpected return value type.");
4114 bool Is64Bit = (RetVT == MVT::i64);
4115 unsigned RegSize = Is64Bit ? 64 : 32;
4116 unsigned DstBits = RetVT.getSizeInBits();
4117 unsigned SrcBits = SrcVT.getSizeInBits();
4118 const TargetRegisterClass *RC =
4119 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4121 // Just emit a copy for "zero" shifts.
4123 if (RetVT == SrcVT) {
4124 unsigned ResultReg = createResultReg(RC);
4125 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4126 TII.get(TargetOpcode::COPY), ResultReg)
4127 .addReg(Op0, getKillRegState(Op0IsKill));
4130 return emitIntExt(SrcVT, Op0, RetVT, IsZExt);
4133 // Don't deal with undefined shifts.
4134 if (Shift >= DstBits)
4137 // For immediate shifts we can fold the zero-/sign-extension into the shift.
4138 // {S|U}BFM Wd, Wn, #r, #s
4139 // Wd<32+s-r,32-r> = Wn<s:0> when r > s
4141 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4142 // %2 = shl i16 %1, 4
4143 // Wd<32+7-28,32-28> = Wn<7:0> <- clamp s to 7
4144 // 0b1111_1111_1111_1111__1111_1010_1010_0000 sext
4145 // 0b0000_0000_0000_0000__0000_0101_0101_0000 sext | zext
4146 // 0b0000_0000_0000_0000__0000_1010_1010_0000 zext
4148 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4149 // %2 = shl i16 %1, 8
4150 // Wd<32+7-24,32-24> = Wn<7:0>
4151 // 0b1111_1111_1111_1111__1010_1010_0000_0000 sext
4152 // 0b0000_0000_0000_0000__0101_0101_0000_0000 sext | zext
4153 // 0b0000_0000_0000_0000__1010_1010_0000_0000 zext
4155 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4156 // %2 = shl i16 %1, 12
4157 // Wd<32+3-20,32-20> = Wn<3:0>
4158 // 0b1111_1111_1111_1111__1010_0000_0000_0000 sext
4159 // 0b0000_0000_0000_0000__0101_0000_0000_0000 sext | zext
4160 // 0b0000_0000_0000_0000__1010_0000_0000_0000 zext
4162 unsigned ImmR = RegSize - Shift;
4163 // Limit the width to the length of the source type.
4164 unsigned ImmS = std::min<unsigned>(SrcBits - 1, DstBits - 1 - Shift);
4165 static const unsigned OpcTable[2][2] = {
4166 {AArch64::SBFMWri, AArch64::SBFMXri},
4167 {AArch64::UBFMWri, AArch64::UBFMXri}
4169 unsigned Opc = OpcTable[IsZExt][Is64Bit];
4170 if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) {
4171 Register TmpReg = MRI.createVirtualRegister(RC);
4172 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4173 TII.get(AArch64::SUBREG_TO_REG), TmpReg)
4175 .addReg(Op0, getKillRegState(Op0IsKill))
4176 .addImm(AArch64::sub_32);
4180 return fastEmitInst_rii(Opc, RC, Op0, Op0IsKill, ImmR, ImmS);
4183 unsigned AArch64FastISel::emitLSR_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
4184 unsigned Op1Reg, bool Op1IsKill) {
4186 bool NeedTrunc = false;
4188 switch (RetVT.SimpleTy) {
4190 case MVT::i8: Opc = AArch64::LSRVWr; NeedTrunc = true; Mask = 0xff; break;
4191 case MVT::i16: Opc = AArch64::LSRVWr; NeedTrunc = true; Mask = 0xffff; break;
4192 case MVT::i32: Opc = AArch64::LSRVWr; break;
4193 case MVT::i64: Opc = AArch64::LSRVXr; break;
4196 const TargetRegisterClass *RC =
4197 (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4199 Op0Reg = emitAnd_ri(MVT::i32, Op0Reg, Op0IsKill, Mask);
4200 Op1Reg = emitAnd_ri(MVT::i32, Op1Reg, Op1IsKill, Mask);
4201 Op0IsKill = Op1IsKill = true;
4203 unsigned ResultReg = fastEmitInst_rr(Opc, RC, Op0Reg, Op0IsKill, Op1Reg,
4206 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
4210 unsigned AArch64FastISel::emitLSR_ri(MVT RetVT, MVT SrcVT, unsigned Op0,
4211 bool Op0IsKill, uint64_t Shift,
4213 assert(RetVT.SimpleTy >= SrcVT.SimpleTy &&
4214 "Unexpected source/return type pair.");
4215 assert((SrcVT == MVT::i1 || SrcVT == MVT::i8 || SrcVT == MVT::i16 ||
4216 SrcVT == MVT::i32 || SrcVT == MVT::i64) &&
4217 "Unexpected source value type.");
4218 assert((RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32 ||
4219 RetVT == MVT::i64) && "Unexpected return value type.");
4221 bool Is64Bit = (RetVT == MVT::i64);
4222 unsigned RegSize = Is64Bit ? 64 : 32;
4223 unsigned DstBits = RetVT.getSizeInBits();
4224 unsigned SrcBits = SrcVT.getSizeInBits();
4225 const TargetRegisterClass *RC =
4226 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4228 // Just emit a copy for "zero" shifts.
4230 if (RetVT == SrcVT) {
4231 unsigned ResultReg = createResultReg(RC);
4232 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4233 TII.get(TargetOpcode::COPY), ResultReg)
4234 .addReg(Op0, getKillRegState(Op0IsKill));
4237 return emitIntExt(SrcVT, Op0, RetVT, IsZExt);
4240 // Don't deal with undefined shifts.
4241 if (Shift >= DstBits)
4244 // For immediate shifts we can fold the zero-/sign-extension into the shift.
4245 // {S|U}BFM Wd, Wn, #r, #s
4246 // Wd<s-r:0> = Wn<s:r> when r <= s
4248 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4249 // %2 = lshr i16 %1, 4
4250 // Wd<7-4:0> = Wn<7:4>
4251 // 0b0000_0000_0000_0000__0000_1111_1111_1010 sext
4252 // 0b0000_0000_0000_0000__0000_0000_0000_0101 sext | zext
4253 // 0b0000_0000_0000_0000__0000_0000_0000_1010 zext
4255 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4256 // %2 = lshr i16 %1, 8
4257 // Wd<7-7,0> = Wn<7:7>
4258 // 0b0000_0000_0000_0000__0000_0000_1111_1111 sext
4259 // 0b0000_0000_0000_0000__0000_0000_0000_0000 sext
4260 // 0b0000_0000_0000_0000__0000_0000_0000_0000 zext
4262 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4263 // %2 = lshr i16 %1, 12
4264 // Wd<7-7,0> = Wn<7:7> <- clamp r to 7
4265 // 0b0000_0000_0000_0000__0000_0000_0000_1111 sext
4266 // 0b0000_0000_0000_0000__0000_0000_0000_0000 sext
4267 // 0b0000_0000_0000_0000__0000_0000_0000_0000 zext
4269 if (Shift >= SrcBits && IsZExt)
4270 return materializeInt(ConstantInt::get(*Context, APInt(RegSize, 0)), RetVT);
4272 // It is not possible to fold a sign-extend into the LShr instruction. In this
4273 // case emit a sign-extend.
4275 Op0 = emitIntExt(SrcVT, Op0, RetVT, IsZExt);
4280 SrcBits = SrcVT.getSizeInBits();
4284 unsigned ImmR = std::min<unsigned>(SrcBits - 1, Shift);
4285 unsigned ImmS = SrcBits - 1;
4286 static const unsigned OpcTable[2][2] = {
4287 {AArch64::SBFMWri, AArch64::SBFMXri},
4288 {AArch64::UBFMWri, AArch64::UBFMXri}
4290 unsigned Opc = OpcTable[IsZExt][Is64Bit];
4291 if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) {
4292 Register TmpReg = MRI.createVirtualRegister(RC);
4293 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4294 TII.get(AArch64::SUBREG_TO_REG), TmpReg)
4296 .addReg(Op0, getKillRegState(Op0IsKill))
4297 .addImm(AArch64::sub_32);
4301 return fastEmitInst_rii(Opc, RC, Op0, Op0IsKill, ImmR, ImmS);
4304 unsigned AArch64FastISel::emitASR_rr(MVT RetVT, unsigned Op0Reg, bool Op0IsKill,
4305 unsigned Op1Reg, bool Op1IsKill) {
4307 bool NeedTrunc = false;
4309 switch (RetVT.SimpleTy) {
4311 case MVT::i8: Opc = AArch64::ASRVWr; NeedTrunc = true; Mask = 0xff; break;
4312 case MVT::i16: Opc = AArch64::ASRVWr; NeedTrunc = true; Mask = 0xffff; break;
4313 case MVT::i32: Opc = AArch64::ASRVWr; break;
4314 case MVT::i64: Opc = AArch64::ASRVXr; break;
4317 const TargetRegisterClass *RC =
4318 (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4320 Op0Reg = emitIntExt(RetVT, Op0Reg, MVT::i32, /*isZExt=*/false);
4321 Op1Reg = emitAnd_ri(MVT::i32, Op1Reg, Op1IsKill, Mask);
4322 Op0IsKill = Op1IsKill = true;
4324 unsigned ResultReg = fastEmitInst_rr(Opc, RC, Op0Reg, Op0IsKill, Op1Reg,
4327 ResultReg = emitAnd_ri(MVT::i32, ResultReg, /*IsKill=*/true, Mask);
4331 unsigned AArch64FastISel::emitASR_ri(MVT RetVT, MVT SrcVT, unsigned Op0,
4332 bool Op0IsKill, uint64_t Shift,
4334 assert(RetVT.SimpleTy >= SrcVT.SimpleTy &&
4335 "Unexpected source/return type pair.");
4336 assert((SrcVT == MVT::i1 || SrcVT == MVT::i8 || SrcVT == MVT::i16 ||
4337 SrcVT == MVT::i32 || SrcVT == MVT::i64) &&
4338 "Unexpected source value type.");
4339 assert((RetVT == MVT::i8 || RetVT == MVT::i16 || RetVT == MVT::i32 ||
4340 RetVT == MVT::i64) && "Unexpected return value type.");
4342 bool Is64Bit = (RetVT == MVT::i64);
4343 unsigned RegSize = Is64Bit ? 64 : 32;
4344 unsigned DstBits = RetVT.getSizeInBits();
4345 unsigned SrcBits = SrcVT.getSizeInBits();
4346 const TargetRegisterClass *RC =
4347 Is64Bit ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4349 // Just emit a copy for "zero" shifts.
4351 if (RetVT == SrcVT) {
4352 unsigned ResultReg = createResultReg(RC);
4353 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4354 TII.get(TargetOpcode::COPY), ResultReg)
4355 .addReg(Op0, getKillRegState(Op0IsKill));
4358 return emitIntExt(SrcVT, Op0, RetVT, IsZExt);
4361 // Don't deal with undefined shifts.
4362 if (Shift >= DstBits)
4365 // For immediate shifts we can fold the zero-/sign-extension into the shift.
4366 // {S|U}BFM Wd, Wn, #r, #s
4367 // Wd<s-r:0> = Wn<s:r> when r <= s
4369 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4370 // %2 = ashr i16 %1, 4
4371 // Wd<7-4:0> = Wn<7:4>
4372 // 0b1111_1111_1111_1111__1111_1111_1111_1010 sext
4373 // 0b0000_0000_0000_0000__0000_0000_0000_0101 sext | zext
4374 // 0b0000_0000_0000_0000__0000_0000_0000_1010 zext
4376 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4377 // %2 = ashr i16 %1, 8
4378 // Wd<7-7,0> = Wn<7:7>
4379 // 0b1111_1111_1111_1111__1111_1111_1111_1111 sext
4380 // 0b0000_0000_0000_0000__0000_0000_0000_0000 sext
4381 // 0b0000_0000_0000_0000__0000_0000_0000_0000 zext
4383 // %1 = {s|z}ext i8 {0b1010_1010|0b0101_0101} to i16
4384 // %2 = ashr i16 %1, 12
4385 // Wd<7-7,0> = Wn<7:7> <- clamp r to 7
4386 // 0b1111_1111_1111_1111__1111_1111_1111_1111 sext
4387 // 0b0000_0000_0000_0000__0000_0000_0000_0000 sext
4388 // 0b0000_0000_0000_0000__0000_0000_0000_0000 zext
4390 if (Shift >= SrcBits && IsZExt)
4391 return materializeInt(ConstantInt::get(*Context, APInt(RegSize, 0)), RetVT);
4393 unsigned ImmR = std::min<unsigned>(SrcBits - 1, Shift);
4394 unsigned ImmS = SrcBits - 1;
4395 static const unsigned OpcTable[2][2] = {
4396 {AArch64::SBFMWri, AArch64::SBFMXri},
4397 {AArch64::UBFMWri, AArch64::UBFMXri}
4399 unsigned Opc = OpcTable[IsZExt][Is64Bit];
4400 if (SrcVT.SimpleTy <= MVT::i32 && RetVT == MVT::i64) {
4401 Register TmpReg = MRI.createVirtualRegister(RC);
4402 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4403 TII.get(AArch64::SUBREG_TO_REG), TmpReg)
4405 .addReg(Op0, getKillRegState(Op0IsKill))
4406 .addImm(AArch64::sub_32);
4410 return fastEmitInst_rii(Opc, RC, Op0, Op0IsKill, ImmR, ImmS);
4413 unsigned AArch64FastISel::emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
4415 assert(DestVT != MVT::i1 && "ZeroExt/SignExt an i1?");
4417 // FastISel does not have plumbing to deal with extensions where the SrcVT or
4418 // DestVT are odd things, so test to make sure that they are both types we can
4419 // handle (i1/i8/i16/i32 for SrcVT and i8/i16/i32/i64 for DestVT), otherwise
4420 // bail out to SelectionDAG.
4421 if (((DestVT != MVT::i8) && (DestVT != MVT::i16) &&
4422 (DestVT != MVT::i32) && (DestVT != MVT::i64)) ||
4423 ((SrcVT != MVT::i1) && (SrcVT != MVT::i8) &&
4424 (SrcVT != MVT::i16) && (SrcVT != MVT::i32)))
4430 switch (SrcVT.SimpleTy) {
4434 return emiti1Ext(SrcReg, DestVT, IsZExt);
4436 if (DestVT == MVT::i64)
4437 Opc = IsZExt ? AArch64::UBFMXri : AArch64::SBFMXri;
4439 Opc = IsZExt ? AArch64::UBFMWri : AArch64::SBFMWri;
4443 if (DestVT == MVT::i64)
4444 Opc = IsZExt ? AArch64::UBFMXri : AArch64::SBFMXri;
4446 Opc = IsZExt ? AArch64::UBFMWri : AArch64::SBFMWri;
4450 assert(DestVT == MVT::i64 && "IntExt i32 to i32?!?");
4451 Opc = IsZExt ? AArch64::UBFMXri : AArch64::SBFMXri;
4456 // Handle i8 and i16 as i32.
4457 if (DestVT == MVT::i8 || DestVT == MVT::i16)
4459 else if (DestVT == MVT::i64) {
4460 Register Src64 = MRI.createVirtualRegister(&AArch64::GPR64RegClass);
4461 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4462 TII.get(AArch64::SUBREG_TO_REG), Src64)
4465 .addImm(AArch64::sub_32);
4469 const TargetRegisterClass *RC =
4470 (DestVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4471 return fastEmitInst_rii(Opc, RC, SrcReg, /*TODO:IsKill=*/false, 0, Imm);
4474 static bool isZExtLoad(const MachineInstr *LI) {
4475 switch (LI->getOpcode()) {
4478 case AArch64::LDURBBi:
4479 case AArch64::LDURHHi:
4480 case AArch64::LDURWi:
4481 case AArch64::LDRBBui:
4482 case AArch64::LDRHHui:
4483 case AArch64::LDRWui:
4484 case AArch64::LDRBBroX:
4485 case AArch64::LDRHHroX:
4486 case AArch64::LDRWroX:
4487 case AArch64::LDRBBroW:
4488 case AArch64::LDRHHroW:
4489 case AArch64::LDRWroW:
4494 static bool isSExtLoad(const MachineInstr *LI) {
4495 switch (LI->getOpcode()) {
4498 case AArch64::LDURSBWi:
4499 case AArch64::LDURSHWi:
4500 case AArch64::LDURSBXi:
4501 case AArch64::LDURSHXi:
4502 case AArch64::LDURSWi:
4503 case AArch64::LDRSBWui:
4504 case AArch64::LDRSHWui:
4505 case AArch64::LDRSBXui:
4506 case AArch64::LDRSHXui:
4507 case AArch64::LDRSWui:
4508 case AArch64::LDRSBWroX:
4509 case AArch64::LDRSHWroX:
4510 case AArch64::LDRSBXroX:
4511 case AArch64::LDRSHXroX:
4512 case AArch64::LDRSWroX:
4513 case AArch64::LDRSBWroW:
4514 case AArch64::LDRSHWroW:
4515 case AArch64::LDRSBXroW:
4516 case AArch64::LDRSHXroW:
4517 case AArch64::LDRSWroW:
4522 bool AArch64FastISel::optimizeIntExtLoad(const Instruction *I, MVT RetVT,
4524 const auto *LI = dyn_cast<LoadInst>(I->getOperand(0));
4525 if (!LI || !LI->hasOneUse())
4528 // Check if the load instruction has already been selected.
4529 unsigned Reg = lookUpRegForValue(LI);
4533 MachineInstr *MI = MRI.getUniqueVRegDef(Reg);
4537 // Check if the correct load instruction has been emitted - SelectionDAG might
4538 // have emitted a zero-extending load, but we need a sign-extending load.
4539 bool IsZExt = isa<ZExtInst>(I);
4540 const auto *LoadMI = MI;
4541 if (LoadMI->getOpcode() == TargetOpcode::COPY &&
4542 LoadMI->getOperand(1).getSubReg() == AArch64::sub_32) {
4543 Register LoadReg = MI->getOperand(1).getReg();
4544 LoadMI = MRI.getUniqueVRegDef(LoadReg);
4545 assert(LoadMI && "Expected valid instruction");
4547 if (!(IsZExt && isZExtLoad(LoadMI)) && !(!IsZExt && isSExtLoad(LoadMI)))
4550 // Nothing to be done.
4551 if (RetVT != MVT::i64 || SrcVT > MVT::i32) {
4552 updateValueMap(I, Reg);
4557 unsigned Reg64 = createResultReg(&AArch64::GPR64RegClass);
4558 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4559 TII.get(AArch64::SUBREG_TO_REG), Reg64)
4561 .addReg(Reg, getKillRegState(true))
4562 .addImm(AArch64::sub_32);
4565 assert((MI->getOpcode() == TargetOpcode::COPY &&
4566 MI->getOperand(1).getSubReg() == AArch64::sub_32) &&
4567 "Expected copy instruction");
4568 Reg = MI->getOperand(1).getReg();
4569 MachineBasicBlock::iterator I(MI);
4570 removeDeadCode(I, std::next(I));
4572 updateValueMap(I, Reg);
4576 bool AArch64FastISel::selectIntExt(const Instruction *I) {
4577 assert((isa<ZExtInst>(I) || isa<SExtInst>(I)) &&
4578 "Unexpected integer extend instruction.");
4581 if (!isTypeSupported(I->getType(), RetVT))
4584 if (!isTypeSupported(I->getOperand(0)->getType(), SrcVT))
4587 // Try to optimize already sign-/zero-extended values from load instructions.
4588 if (optimizeIntExtLoad(I, RetVT, SrcVT))
4591 unsigned SrcReg = getRegForValue(I->getOperand(0));
4594 bool SrcIsKill = hasTrivialKill(I->getOperand(0));
4596 // Try to optimize already sign-/zero-extended values from function arguments.
4597 bool IsZExt = isa<ZExtInst>(I);
4598 if (const auto *Arg = dyn_cast<Argument>(I->getOperand(0))) {
4599 if ((IsZExt && Arg->hasZExtAttr()) || (!IsZExt && Arg->hasSExtAttr())) {
4600 if (RetVT == MVT::i64 && SrcVT != MVT::i64) {
4601 unsigned ResultReg = createResultReg(&AArch64::GPR64RegClass);
4602 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
4603 TII.get(AArch64::SUBREG_TO_REG), ResultReg)
4605 .addReg(SrcReg, getKillRegState(SrcIsKill))
4606 .addImm(AArch64::sub_32);
4609 // Conservatively clear all kill flags from all uses, because we are
4610 // replacing a sign-/zero-extend instruction at IR level with a nop at MI
4611 // level. The result of the instruction at IR level might have been
4612 // trivially dead, which is now not longer true.
4613 unsigned UseReg = lookUpRegForValue(I);
4615 MRI.clearKillFlags(UseReg);
4617 updateValueMap(I, SrcReg);
4622 unsigned ResultReg = emitIntExt(SrcVT, SrcReg, RetVT, IsZExt);
4626 updateValueMap(I, ResultReg);
4630 bool AArch64FastISel::selectRem(const Instruction *I, unsigned ISDOpcode) {
4631 EVT DestEVT = TLI.getValueType(DL, I->getType(), true);
4632 if (!DestEVT.isSimple())
4635 MVT DestVT = DestEVT.getSimpleVT();
4636 if (DestVT != MVT::i64 && DestVT != MVT::i32)
4640 bool Is64bit = (DestVT == MVT::i64);
4641 switch (ISDOpcode) {
4645 DivOpc = Is64bit ? AArch64::SDIVXr : AArch64::SDIVWr;
4648 DivOpc = Is64bit ? AArch64::UDIVXr : AArch64::UDIVWr;
4651 unsigned MSubOpc = Is64bit ? AArch64::MSUBXrrr : AArch64::MSUBWrrr;
4652 unsigned Src0Reg = getRegForValue(I->getOperand(0));
4655 bool Src0IsKill = hasTrivialKill(I->getOperand(0));
4657 unsigned Src1Reg = getRegForValue(I->getOperand(1));
4660 bool Src1IsKill = hasTrivialKill(I->getOperand(1));
4662 const TargetRegisterClass *RC =
4663 (DestVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
4664 unsigned QuotReg = fastEmitInst_rr(DivOpc, RC, Src0Reg, /*IsKill=*/false,
4665 Src1Reg, /*IsKill=*/false);
4666 assert(QuotReg && "Unexpected DIV instruction emission failure.");
4667 // The remainder is computed as numerator - (quotient * denominator) using the
4668 // MSUB instruction.
4669 unsigned ResultReg = fastEmitInst_rrr(MSubOpc, RC, QuotReg, /*IsKill=*/true,
4670 Src1Reg, Src1IsKill, Src0Reg,
4672 updateValueMap(I, ResultReg);
4676 bool AArch64FastISel::selectMul(const Instruction *I) {
4678 if (!isTypeSupported(I->getType(), VT, /*IsVectorAllowed=*/true))
4682 return selectBinaryOp(I, ISD::MUL);
4684 const Value *Src0 = I->getOperand(0);
4685 const Value *Src1 = I->getOperand(1);
4686 if (const auto *C = dyn_cast<ConstantInt>(Src0))
4687 if (C->getValue().isPowerOf2())
4688 std::swap(Src0, Src1);
4690 // Try to simplify to a shift instruction.
4691 if (const auto *C = dyn_cast<ConstantInt>(Src1))
4692 if (C->getValue().isPowerOf2()) {
4693 uint64_t ShiftVal = C->getValue().logBase2();
4696 if (const auto *ZExt = dyn_cast<ZExtInst>(Src0)) {
4697 if (!isIntExtFree(ZExt)) {
4699 if (isValueAvailable(ZExt) && isTypeSupported(ZExt->getSrcTy(), VT)) {
4702 Src0 = ZExt->getOperand(0);
4705 } else if (const auto *SExt = dyn_cast<SExtInst>(Src0)) {
4706 if (!isIntExtFree(SExt)) {
4708 if (isValueAvailable(SExt) && isTypeSupported(SExt->getSrcTy(), VT)) {
4711 Src0 = SExt->getOperand(0);
4716 unsigned Src0Reg = getRegForValue(Src0);
4719 bool Src0IsKill = hasTrivialKill(Src0);
4721 unsigned ResultReg =
4722 emitLSL_ri(VT, SrcVT, Src0Reg, Src0IsKill, ShiftVal, IsZExt);
4725 updateValueMap(I, ResultReg);
4730 unsigned Src0Reg = getRegForValue(I->getOperand(0));
4733 bool Src0IsKill = hasTrivialKill(I->getOperand(0));
4735 unsigned Src1Reg = getRegForValue(I->getOperand(1));
4738 bool Src1IsKill = hasTrivialKill(I->getOperand(1));
4740 unsigned ResultReg = emitMul_rr(VT, Src0Reg, Src0IsKill, Src1Reg, Src1IsKill);
4745 updateValueMap(I, ResultReg);
4749 bool AArch64FastISel::selectShift(const Instruction *I) {
4751 if (!isTypeSupported(I->getType(), RetVT, /*IsVectorAllowed=*/true))
4754 if (RetVT.isVector())
4755 return selectOperator(I, I->getOpcode());
4757 if (const auto *C = dyn_cast<ConstantInt>(I->getOperand(1))) {
4758 unsigned ResultReg = 0;
4759 uint64_t ShiftVal = C->getZExtValue();
4761 bool IsZExt = I->getOpcode() != Instruction::AShr;
4762 const Value *Op0 = I->getOperand(0);
4763 if (const auto *ZExt = dyn_cast<ZExtInst>(Op0)) {
4764 if (!isIntExtFree(ZExt)) {
4766 if (isValueAvailable(ZExt) && isTypeSupported(ZExt->getSrcTy(), TmpVT)) {
4769 Op0 = ZExt->getOperand(0);
4772 } else if (const auto *SExt = dyn_cast<SExtInst>(Op0)) {
4773 if (!isIntExtFree(SExt)) {
4775 if (isValueAvailable(SExt) && isTypeSupported(SExt->getSrcTy(), TmpVT)) {
4778 Op0 = SExt->getOperand(0);
4783 unsigned Op0Reg = getRegForValue(Op0);
4786 bool Op0IsKill = hasTrivialKill(Op0);
4788 switch (I->getOpcode()) {
4789 default: llvm_unreachable("Unexpected instruction.");
4790 case Instruction::Shl:
4791 ResultReg = emitLSL_ri(RetVT, SrcVT, Op0Reg, Op0IsKill, ShiftVal, IsZExt);
4793 case Instruction::AShr:
4794 ResultReg = emitASR_ri(RetVT, SrcVT, Op0Reg, Op0IsKill, ShiftVal, IsZExt);
4796 case Instruction::LShr:
4797 ResultReg = emitLSR_ri(RetVT, SrcVT, Op0Reg, Op0IsKill, ShiftVal, IsZExt);
4803 updateValueMap(I, ResultReg);
4807 unsigned Op0Reg = getRegForValue(I->getOperand(0));
4810 bool Op0IsKill = hasTrivialKill(I->getOperand(0));
4812 unsigned Op1Reg = getRegForValue(I->getOperand(1));
4815 bool Op1IsKill = hasTrivialKill(I->getOperand(1));
4817 unsigned ResultReg = 0;
4818 switch (I->getOpcode()) {
4819 default: llvm_unreachable("Unexpected instruction.");
4820 case Instruction::Shl:
4821 ResultReg = emitLSL_rr(RetVT, Op0Reg, Op0IsKill, Op1Reg, Op1IsKill);
4823 case Instruction::AShr:
4824 ResultReg = emitASR_rr(RetVT, Op0Reg, Op0IsKill, Op1Reg, Op1IsKill);
4826 case Instruction::LShr:
4827 ResultReg = emitLSR_rr(RetVT, Op0Reg, Op0IsKill, Op1Reg, Op1IsKill);
4834 updateValueMap(I, ResultReg);
4838 bool AArch64FastISel::selectBitCast(const Instruction *I) {
4841 if (!isTypeLegal(I->getOperand(0)->getType(), SrcVT))
4843 if (!isTypeLegal(I->getType(), RetVT))
4847 if (RetVT == MVT::f32 && SrcVT == MVT::i32)
4848 Opc = AArch64::FMOVWSr;
4849 else if (RetVT == MVT::f64 && SrcVT == MVT::i64)
4850 Opc = AArch64::FMOVXDr;
4851 else if (RetVT == MVT::i32 && SrcVT == MVT::f32)
4852 Opc = AArch64::FMOVSWr;
4853 else if (RetVT == MVT::i64 && SrcVT == MVT::f64)
4854 Opc = AArch64::FMOVDXr;
4858 const TargetRegisterClass *RC = nullptr;
4859 switch (RetVT.SimpleTy) {
4860 default: llvm_unreachable("Unexpected value type.");
4861 case MVT::i32: RC = &AArch64::GPR32RegClass; break;
4862 case MVT::i64: RC = &AArch64::GPR64RegClass; break;
4863 case MVT::f32: RC = &AArch64::FPR32RegClass; break;
4864 case MVT::f64: RC = &AArch64::FPR64RegClass; break;
4866 unsigned Op0Reg = getRegForValue(I->getOperand(0));
4869 bool Op0IsKill = hasTrivialKill(I->getOperand(0));
4870 unsigned ResultReg = fastEmitInst_r(Opc, RC, Op0Reg, Op0IsKill);
4875 updateValueMap(I, ResultReg);
4879 bool AArch64FastISel::selectFRem(const Instruction *I) {
4881 if (!isTypeLegal(I->getType(), RetVT))
4885 switch (RetVT.SimpleTy) {
4889 LC = RTLIB::REM_F32;
4892 LC = RTLIB::REM_F64;
4897 Args.reserve(I->getNumOperands());
4899 // Populate the argument list.
4900 for (auto &Arg : I->operands()) {
4903 Entry.Ty = Arg->getType();
4904 Args.push_back(Entry);
4907 CallLoweringInfo CLI;
4908 MCContext &Ctx = MF->getContext();
4909 CLI.setCallee(DL, Ctx, TLI.getLibcallCallingConv(LC), I->getType(),
4910 TLI.getLibcallName(LC), std::move(Args));
4911 if (!lowerCallTo(CLI))
4913 updateValueMap(I, CLI.ResultReg);
4917 bool AArch64FastISel::selectSDiv(const Instruction *I) {
4919 if (!isTypeLegal(I->getType(), VT))
4922 if (!isa<ConstantInt>(I->getOperand(1)))
4923 return selectBinaryOp(I, ISD::SDIV);
4925 const APInt &C = cast<ConstantInt>(I->getOperand(1))->getValue();
4926 if ((VT != MVT::i32 && VT != MVT::i64) || !C ||
4927 !(C.isPowerOf2() || (-C).isPowerOf2()))
4928 return selectBinaryOp(I, ISD::SDIV);
4930 unsigned Lg2 = C.countTrailingZeros();
4931 unsigned Src0Reg = getRegForValue(I->getOperand(0));
4934 bool Src0IsKill = hasTrivialKill(I->getOperand(0));
4936 if (cast<BinaryOperator>(I)->isExact()) {
4937 unsigned ResultReg = emitASR_ri(VT, VT, Src0Reg, Src0IsKill, Lg2);
4940 updateValueMap(I, ResultReg);
4944 int64_t Pow2MinusOne = (1ULL << Lg2) - 1;
4945 unsigned AddReg = emitAdd_ri_(VT, Src0Reg, /*IsKill=*/false, Pow2MinusOne);
4949 // (Src0 < 0) ? Pow2 - 1 : 0;
4950 if (!emitICmp_ri(VT, Src0Reg, /*IsKill=*/false, 0))
4954 const TargetRegisterClass *RC;
4955 if (VT == MVT::i64) {
4956 SelectOpc = AArch64::CSELXr;
4957 RC = &AArch64::GPR64RegClass;
4959 SelectOpc = AArch64::CSELWr;
4960 RC = &AArch64::GPR32RegClass;
4962 unsigned SelectReg =
4963 fastEmitInst_rri(SelectOpc, RC, AddReg, /*IsKill=*/true, Src0Reg,
4964 Src0IsKill, AArch64CC::LT);
4968 // Divide by Pow2 --> ashr. If we're dividing by a negative value we must also
4969 // negate the result.
4970 unsigned ZeroReg = (VT == MVT::i64) ? AArch64::XZR : AArch64::WZR;
4973 ResultReg = emitAddSub_rs(/*UseAdd=*/false, VT, ZeroReg, /*IsKill=*/true,
4974 SelectReg, /*IsKill=*/true, AArch64_AM::ASR, Lg2);
4976 ResultReg = emitASR_ri(VT, VT, SelectReg, /*IsKill=*/true, Lg2);
4981 updateValueMap(I, ResultReg);
4985 /// This is mostly a copy of the existing FastISel getRegForGEPIndex code. We
4986 /// have to duplicate it for AArch64, because otherwise we would fail during the
4987 /// sign-extend emission.
4988 std::pair<unsigned, bool> AArch64FastISel::getRegForGEPIndex(const Value *Idx) {
4989 unsigned IdxN = getRegForValue(Idx);
4991 // Unhandled operand. Halt "fast" selection and bail.
4992 return std::pair<unsigned, bool>(0, false);
4994 bool IdxNIsKill = hasTrivialKill(Idx);
4996 // If the index is smaller or larger than intptr_t, truncate or extend it.
4997 MVT PtrVT = TLI.getPointerTy(DL);
4998 EVT IdxVT = EVT::getEVT(Idx->getType(), /*HandleUnknown=*/false);
4999 if (IdxVT.bitsLT(PtrVT)) {
5000 IdxN = emitIntExt(IdxVT.getSimpleVT(), IdxN, PtrVT, /*isZExt=*/false);
5002 } else if (IdxVT.bitsGT(PtrVT))
5003 llvm_unreachable("AArch64 FastISel doesn't support types larger than i64");
5004 return std::pair<unsigned, bool>(IdxN, IdxNIsKill);
5007 /// This is mostly a copy of the existing FastISel GEP code, but we have to
5008 /// duplicate it for AArch64, because otherwise we would bail out even for
5009 /// simple cases. This is because the standard fastEmit functions don't cover
5010 /// MUL at all and ADD is lowered very inefficientily.
5011 bool AArch64FastISel::selectGetElementPtr(const Instruction *I) {
5012 unsigned N = getRegForValue(I->getOperand(0));
5015 bool NIsKill = hasTrivialKill(I->getOperand(0));
5017 // Keep a running tab of the total offset to coalesce multiple N = N + Offset
5018 // into a single N = N + TotalOffset.
5019 uint64_t TotalOffs = 0;
5020 MVT VT = TLI.getPointerTy(DL);
5021 for (gep_type_iterator GTI = gep_type_begin(I), E = gep_type_end(I);
5023 const Value *Idx = GTI.getOperand();
5024 if (auto *StTy = GTI.getStructTypeOrNull()) {
5025 unsigned Field = cast<ConstantInt>(Idx)->getZExtValue();
5028 TotalOffs += DL.getStructLayout(StTy)->getElementOffset(Field);
5030 Type *Ty = GTI.getIndexedType();
5032 // If this is a constant subscript, handle it quickly.
5033 if (const auto *CI = dyn_cast<ConstantInt>(Idx)) {
5038 DL.getTypeAllocSize(Ty) * cast<ConstantInt>(CI)->getSExtValue();
5042 N = emitAdd_ri_(VT, N, NIsKill, TotalOffs);
5049 // N = N + Idx * ElementSize;
5050 uint64_t ElementSize = DL.getTypeAllocSize(Ty);
5051 std::pair<unsigned, bool> Pair = getRegForGEPIndex(Idx);
5052 unsigned IdxN = Pair.first;
5053 bool IdxNIsKill = Pair.second;
5057 if (ElementSize != 1) {
5058 unsigned C = fastEmit_i(VT, VT, ISD::Constant, ElementSize);
5061 IdxN = emitMul_rr(VT, IdxN, IdxNIsKill, C, true);
5066 N = fastEmit_rr(VT, VT, ISD::ADD, N, NIsKill, IdxN, IdxNIsKill);
5072 N = emitAdd_ri_(VT, N, NIsKill, TotalOffs);
5076 updateValueMap(I, N);
5080 bool AArch64FastISel::selectAtomicCmpXchg(const AtomicCmpXchgInst *I) {
5081 assert(TM.getOptLevel() == CodeGenOpt::None &&
5082 "cmpxchg survived AtomicExpand at optlevel > -O0");
5084 auto *RetPairTy = cast<StructType>(I->getType());
5085 Type *RetTy = RetPairTy->getTypeAtIndex(0U);
5086 assert(RetPairTy->getTypeAtIndex(1U)->isIntegerTy(1) &&
5087 "cmpxchg has a non-i1 status result");
5090 if (!isTypeLegal(RetTy, VT))
5093 const TargetRegisterClass *ResRC;
5094 unsigned Opc, CmpOpc;
5095 // This only supports i32/i64, because i8/i16 aren't legal, and the generic
5096 // extractvalue selection doesn't support that.
5097 if (VT == MVT::i32) {
5098 Opc = AArch64::CMP_SWAP_32;
5099 CmpOpc = AArch64::SUBSWrs;
5100 ResRC = &AArch64::GPR32RegClass;
5101 } else if (VT == MVT::i64) {
5102 Opc = AArch64::CMP_SWAP_64;
5103 CmpOpc = AArch64::SUBSXrs;
5104 ResRC = &AArch64::GPR64RegClass;
5109 const MCInstrDesc &II = TII.get(Opc);
5111 const unsigned AddrReg = constrainOperandRegClass(
5112 II, getRegForValue(I->getPointerOperand()), II.getNumDefs());
5113 const unsigned DesiredReg = constrainOperandRegClass(
5114 II, getRegForValue(I->getCompareOperand()), II.getNumDefs() + 1);
5115 const unsigned NewReg = constrainOperandRegClass(
5116 II, getRegForValue(I->getNewValOperand()), II.getNumDefs() + 2);
5118 const unsigned ResultReg1 = createResultReg(ResRC);
5119 const unsigned ResultReg2 = createResultReg(&AArch64::GPR32RegClass);
5120 const unsigned ScratchReg = createResultReg(&AArch64::GPR32RegClass);
5122 // FIXME: MachineMemOperand doesn't support cmpxchg yet.
5123 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, II)
5130 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(CmpOpc))
5131 .addDef(VT == MVT::i32 ? AArch64::WZR : AArch64::XZR)
5136 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(AArch64::CSINCWr))
5138 .addUse(AArch64::WZR)
5139 .addUse(AArch64::WZR)
5140 .addImm(AArch64CC::NE);
5142 assert((ResultReg1 + 1) == ResultReg2 && "Nonconsecutive result registers.");
5143 updateValueMap(I, ResultReg1, 2);
5147 bool AArch64FastISel::fastSelectInstruction(const Instruction *I) {
5148 switch (I->getOpcode()) {
5151 case Instruction::Add:
5152 case Instruction::Sub:
5153 return selectAddSub(I);
5154 case Instruction::Mul:
5155 return selectMul(I);
5156 case Instruction::SDiv:
5157 return selectSDiv(I);
5158 case Instruction::SRem:
5159 if (!selectBinaryOp(I, ISD::SREM))
5160 return selectRem(I, ISD::SREM);
5162 case Instruction::URem:
5163 if (!selectBinaryOp(I, ISD::UREM))
5164 return selectRem(I, ISD::UREM);
5166 case Instruction::Shl:
5167 case Instruction::LShr:
5168 case Instruction::AShr:
5169 return selectShift(I);
5170 case Instruction::And:
5171 case Instruction::Or:
5172 case Instruction::Xor:
5173 return selectLogicalOp(I);
5174 case Instruction::Br:
5175 return selectBranch(I);
5176 case Instruction::IndirectBr:
5177 return selectIndirectBr(I);
5178 case Instruction::BitCast:
5179 if (!FastISel::selectBitCast(I))
5180 return selectBitCast(I);
5182 case Instruction::FPToSI:
5183 if (!selectCast(I, ISD::FP_TO_SINT))
5184 return selectFPToInt(I, /*Signed=*/true);
5186 case Instruction::FPToUI:
5187 return selectFPToInt(I, /*Signed=*/false);
5188 case Instruction::ZExt:
5189 case Instruction::SExt:
5190 return selectIntExt(I);
5191 case Instruction::Trunc:
5192 if (!selectCast(I, ISD::TRUNCATE))
5193 return selectTrunc(I);
5195 case Instruction::FPExt:
5196 return selectFPExt(I);
5197 case Instruction::FPTrunc:
5198 return selectFPTrunc(I);
5199 case Instruction::SIToFP:
5200 if (!selectCast(I, ISD::SINT_TO_FP))
5201 return selectIntToFP(I, /*Signed=*/true);
5203 case Instruction::UIToFP:
5204 return selectIntToFP(I, /*Signed=*/false);
5205 case Instruction::Load:
5206 return selectLoad(I);
5207 case Instruction::Store:
5208 return selectStore(I);
5209 case Instruction::FCmp:
5210 case Instruction::ICmp:
5211 return selectCmp(I);
5212 case Instruction::Select:
5213 return selectSelect(I);
5214 case Instruction::Ret:
5215 return selectRet(I);
5216 case Instruction::FRem:
5217 return selectFRem(I);
5218 case Instruction::GetElementPtr:
5219 return selectGetElementPtr(I);
5220 case Instruction::AtomicCmpXchg:
5221 return selectAtomicCmpXchg(cast<AtomicCmpXchgInst>(I));
5224 // fall-back to target-independent instruction selection.
5225 return selectOperator(I, I->getOpcode());
5230 FastISel *AArch64::createFastISel(FunctionLoweringInfo &FuncInfo,
5231 const TargetLibraryInfo *LibInfo) {
5232 return new AArch64FastISel(FuncInfo, LibInfo);
5235 } // end namespace llvm