1 //===-- MipsastISel.cpp - Mips FastISel implementation
2 //---------------------===//
4 #include "MipsCCState.h"
5 #include "MipsInstrInfo.h"
6 #include "MipsISelLowering.h"
7 #include "MipsMachineFunction.h"
8 #include "MipsRegisterInfo.h"
9 #include "MipsSubtarget.h"
10 #include "MipsTargetMachine.h"
11 #include "llvm/Analysis/TargetLibraryInfo.h"
12 #include "llvm/CodeGen/FastISel.h"
13 #include "llvm/CodeGen/FunctionLoweringInfo.h"
14 #include "llvm/CodeGen/MachineInstrBuilder.h"
15 #include "llvm/CodeGen/MachineRegisterInfo.h"
16 #include "llvm/IR/GlobalAlias.h"
17 #include "llvm/IR/GlobalVariable.h"
18 #include "llvm/Target/TargetInstrInfo.h"
24 class MipsFastISel final : public FastISel {
26 // All possible address modes.
29 typedef enum { RegBase, FrameIndexBase } BaseKind;
40 const GlobalValue *GV;
43 // Innocuous defaults for our address.
44 Address() : Kind(RegBase), Offset(0), GV(0) { Base.Reg = 0; }
45 void setKind(BaseKind K) { Kind = K; }
46 BaseKind getKind() const { return Kind; }
47 bool isRegBase() const { return Kind == RegBase; }
48 bool isFIBase() const { return Kind == FrameIndexBase; }
49 void setReg(unsigned Reg) {
50 assert(isRegBase() && "Invalid base register access!");
53 unsigned getReg() const {
54 assert(isRegBase() && "Invalid base register access!");
57 void setFI(unsigned FI) {
58 assert(isFIBase() && "Invalid base frame index access!");
61 unsigned getFI() const {
62 assert(isFIBase() && "Invalid base frame index access!");
66 void setOffset(int64_t Offset_) { Offset = Offset_; }
67 int64_t getOffset() const { return Offset; }
68 void setGlobalValue(const GlobalValue *G) { GV = G; }
69 const GlobalValue *getGlobalValue() { return GV; }
72 /// Subtarget - Keep a pointer to the MipsSubtarget around so that we can
73 /// make the right decision when generating code for different targets.
74 const TargetMachine &TM;
75 const MipsSubtarget *Subtarget;
76 const TargetInstrInfo &TII;
77 const TargetLowering &TLI;
78 MipsFunctionInfo *MFI;
80 // Convenience variables to avoid some queries.
83 bool fastLowerCall(CallLoweringInfo &CLI) override;
86 bool UnsupportedFPMode; // To allow fast-isel to proceed and just not handle
87 // floating point but not reject doing fast-isel in other
91 // Selection routines.
92 bool selectLogicalOp(const Instruction *I);
93 bool selectLoad(const Instruction *I);
94 bool selectStore(const Instruction *I);
95 bool selectBranch(const Instruction *I);
96 bool selectCmp(const Instruction *I);
97 bool selectFPExt(const Instruction *I);
98 bool selectFPTrunc(const Instruction *I);
99 bool selectFPToInt(const Instruction *I, bool IsSigned);
100 bool selectRet(const Instruction *I);
101 bool selectTrunc(const Instruction *I);
102 bool selectIntExt(const Instruction *I);
103 bool selectShift(const Instruction *I);
105 // Utility helper routines.
106 bool isTypeLegal(Type *Ty, MVT &VT);
107 bool isTypeSupported(Type *Ty, MVT &VT);
108 bool isLoadTypeLegal(Type *Ty, MVT &VT);
109 bool computeAddress(const Value *Obj, Address &Addr);
110 bool computeCallAddress(const Value *V, Address &Addr);
111 void simplifyAddress(Address &Addr);
113 // Emit helper routines.
114 bool emitCmp(unsigned DestReg, const CmpInst *CI);
115 bool emitLoad(MVT VT, unsigned &ResultReg, Address &Addr,
116 unsigned Alignment = 0);
117 bool emitStore(MVT VT, unsigned SrcReg, Address Addr,
118 MachineMemOperand *MMO = nullptr);
119 bool emitStore(MVT VT, unsigned SrcReg, Address &Addr,
120 unsigned Alignment = 0);
121 unsigned emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT, bool isZExt);
122 bool emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT, unsigned DestReg,
125 bool emitIntZExt(MVT SrcVT, unsigned SrcReg, MVT DestVT, unsigned DestReg);
127 bool emitIntSExt(MVT SrcVT, unsigned SrcReg, MVT DestVT, unsigned DestReg);
128 bool emitIntSExt32r1(MVT SrcVT, unsigned SrcReg, MVT DestVT,
130 bool emitIntSExt32r2(MVT SrcVT, unsigned SrcReg, MVT DestVT,
133 unsigned getRegEnsuringSimpleIntegerWidening(const Value *, bool IsUnsigned);
135 unsigned emitLogicalOp(unsigned ISDOpc, MVT RetVT, const Value *LHS,
138 unsigned materializeFP(const ConstantFP *CFP, MVT VT);
139 unsigned materializeGV(const GlobalValue *GV, MVT VT);
140 unsigned materializeInt(const Constant *C, MVT VT);
141 unsigned materialize32BitInt(int64_t Imm, const TargetRegisterClass *RC);
143 MachineInstrBuilder emitInst(unsigned Opc) {
144 return BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc));
146 MachineInstrBuilder emitInst(unsigned Opc, unsigned DstReg) {
147 return BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc),
150 MachineInstrBuilder emitInstStore(unsigned Opc, unsigned SrcReg,
151 unsigned MemReg, int64_t MemOffset) {
152 return emitInst(Opc).addReg(SrcReg).addReg(MemReg).addImm(MemOffset);
154 MachineInstrBuilder emitInstLoad(unsigned Opc, unsigned DstReg,
155 unsigned MemReg, int64_t MemOffset) {
156 return emitInst(Opc, DstReg).addReg(MemReg).addImm(MemOffset);
158 // for some reason, this default is not generated by tablegen
159 // so we explicitly generate it here.
161 unsigned fastEmitInst_riir(uint64_t inst, const TargetRegisterClass *RC,
162 unsigned Op0, bool Op0IsKill, uint64_t imm1,
163 uint64_t imm2, unsigned Op3, bool Op3IsKill) {
167 // Call handling routines.
169 CCAssignFn *CCAssignFnForCall(CallingConv::ID CC) const;
170 bool processCallArgs(CallLoweringInfo &CLI, SmallVectorImpl<MVT> &ArgVTs,
172 bool finishCall(CallLoweringInfo &CLI, MVT RetVT, unsigned NumBytes);
175 // Backend specific FastISel code.
176 explicit MipsFastISel(FunctionLoweringInfo &funcInfo,
177 const TargetLibraryInfo *libInfo)
178 : FastISel(funcInfo, libInfo), TM(funcInfo.MF->getTarget()),
179 Subtarget(&funcInfo.MF->getSubtarget<MipsSubtarget>()),
180 TII(*Subtarget->getInstrInfo()), TLI(*Subtarget->getTargetLowering()) {
181 MFI = funcInfo.MF->getInfo<MipsFunctionInfo>();
182 Context = &funcInfo.Fn->getContext();
184 ((TM.getRelocationModel() == Reloc::PIC_) &&
185 ((Subtarget->hasMips32r2() || Subtarget->hasMips32()) &&
186 (static_cast<const MipsTargetMachine &>(TM).getABI().IsO32())));
187 UnsupportedFPMode = Subtarget->isFP64bit();
190 unsigned fastMaterializeAlloca(const AllocaInst *AI) override;
191 unsigned fastMaterializeConstant(const Constant *C) override;
192 bool fastSelectInstruction(const Instruction *I) override;
194 #include "MipsGenFastISel.inc"
196 } // end anonymous namespace.
198 static bool CC_Mips(unsigned ValNo, MVT ValVT, MVT LocVT,
199 CCValAssign::LocInfo LocInfo, ISD::ArgFlagsTy ArgFlags,
200 CCState &State) LLVM_ATTRIBUTE_UNUSED;
202 static bool CC_MipsO32_FP32(unsigned ValNo, MVT ValVT, MVT LocVT,
203 CCValAssign::LocInfo LocInfo,
204 ISD::ArgFlagsTy ArgFlags, CCState &State) {
205 llvm_unreachable("should not be called");
208 static bool CC_MipsO32_FP64(unsigned ValNo, MVT ValVT, MVT LocVT,
209 CCValAssign::LocInfo LocInfo,
210 ISD::ArgFlagsTy ArgFlags, CCState &State) {
211 llvm_unreachable("should not be called");
214 #include "MipsGenCallingConv.inc"
216 CCAssignFn *MipsFastISel::CCAssignFnForCall(CallingConv::ID CC) const {
220 unsigned MipsFastISel::emitLogicalOp(unsigned ISDOpc, MVT RetVT,
221 const Value *LHS, const Value *RHS) {
222 // Canonicalize immediates to the RHS first.
223 if (isa<ConstantInt>(LHS) && !isa<ConstantInt>(RHS))
227 if (ISDOpc == ISD::AND) {
229 } else if (ISDOpc == ISD::OR) {
231 } else if (ISDOpc == ISD::XOR) {
234 llvm_unreachable("unexpected opcode");
236 unsigned LHSReg = getRegForValue(LHS);
237 unsigned ResultReg = createResultReg(&Mips::GPR32RegClass);
245 if (const auto *C = dyn_cast<ConstantInt>(RHS))
246 RHSReg = materializeInt(C, MVT::i32);
248 RHSReg = getRegForValue(RHS);
253 emitInst(Opc, ResultReg).addReg(LHSReg).addReg(RHSReg);
257 unsigned MipsFastISel::fastMaterializeAlloca(const AllocaInst *AI) {
258 assert(TLI.getValueType(AI->getType(), true) == MVT::i32 &&
259 "Alloca should always return a pointer.");
261 DenseMap<const AllocaInst *, int>::iterator SI =
262 FuncInfo.StaticAllocaMap.find(AI);
264 if (SI != FuncInfo.StaticAllocaMap.end()) {
265 unsigned ResultReg = createResultReg(&Mips::GPR32RegClass);
266 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Mips::LEA_ADDiu),
268 .addFrameIndex(SI->second)
276 unsigned MipsFastISel::materializeInt(const Constant *C, MVT VT) {
277 if (VT != MVT::i32 && VT != MVT::i16 && VT != MVT::i8 && VT != MVT::i1)
279 const TargetRegisterClass *RC = &Mips::GPR32RegClass;
280 const ConstantInt *CI = cast<ConstantInt>(C);
282 if ((VT != MVT::i1) && CI->isNegative())
283 Imm = CI->getSExtValue();
285 Imm = CI->getZExtValue();
286 return materialize32BitInt(Imm, RC);
289 unsigned MipsFastISel::materialize32BitInt(int64_t Imm,
290 const TargetRegisterClass *RC) {
291 unsigned ResultReg = createResultReg(RC);
293 if (isInt<16>(Imm)) {
294 unsigned Opc = Mips::ADDiu;
295 emitInst(Opc, ResultReg).addReg(Mips::ZERO).addImm(Imm);
297 } else if (isUInt<16>(Imm)) {
298 emitInst(Mips::ORi, ResultReg).addReg(Mips::ZERO).addImm(Imm);
301 unsigned Lo = Imm & 0xFFFF;
302 unsigned Hi = (Imm >> 16) & 0xFFFF;
304 // Both Lo and Hi have nonzero bits.
305 unsigned TmpReg = createResultReg(RC);
306 emitInst(Mips::LUi, TmpReg).addImm(Hi);
307 emitInst(Mips::ORi, ResultReg).addReg(TmpReg).addImm(Lo);
309 emitInst(Mips::LUi, ResultReg).addImm(Hi);
314 unsigned MipsFastISel::materializeFP(const ConstantFP *CFP, MVT VT) {
315 if (UnsupportedFPMode)
317 int64_t Imm = CFP->getValueAPF().bitcastToAPInt().getZExtValue();
318 if (VT == MVT::f32) {
319 const TargetRegisterClass *RC = &Mips::FGR32RegClass;
320 unsigned DestReg = createResultReg(RC);
321 unsigned TempReg = materialize32BitInt(Imm, &Mips::GPR32RegClass);
322 emitInst(Mips::MTC1, DestReg).addReg(TempReg);
324 } else if (VT == MVT::f64) {
325 const TargetRegisterClass *RC = &Mips::AFGR64RegClass;
326 unsigned DestReg = createResultReg(RC);
327 unsigned TempReg1 = materialize32BitInt(Imm >> 32, &Mips::GPR32RegClass);
329 materialize32BitInt(Imm & 0xFFFFFFFF, &Mips::GPR32RegClass);
330 emitInst(Mips::BuildPairF64, DestReg).addReg(TempReg2).addReg(TempReg1);
336 unsigned MipsFastISel::materializeGV(const GlobalValue *GV, MVT VT) {
337 // For now 32-bit only.
340 const TargetRegisterClass *RC = &Mips::GPR32RegClass;
341 unsigned DestReg = createResultReg(RC);
342 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
343 bool IsThreadLocal = GVar && GVar->isThreadLocal();
344 // TLS not supported at this time.
347 emitInst(Mips::LW, DestReg)
348 .addReg(MFI->getGlobalBaseReg())
349 .addGlobalAddress(GV, 0, MipsII::MO_GOT);
350 if ((GV->hasInternalLinkage() ||
351 (GV->hasLocalLinkage() && !isa<Function>(GV)))) {
352 unsigned TempReg = createResultReg(RC);
353 emitInst(Mips::ADDiu, TempReg)
355 .addGlobalAddress(GV, 0, MipsII::MO_ABS_LO);
361 // Materialize a constant into a register, and return the register
362 // number (or zero if we failed to handle it).
363 unsigned MipsFastISel::fastMaterializeConstant(const Constant *C) {
364 EVT CEVT = TLI.getValueType(C->getType(), true);
366 // Only handle simple types.
367 if (!CEVT.isSimple())
369 MVT VT = CEVT.getSimpleVT();
371 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C))
372 return (UnsupportedFPMode) ? 0 : materializeFP(CFP, VT);
373 else if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
374 return materializeGV(GV, VT);
375 else if (isa<ConstantInt>(C))
376 return materializeInt(C, VT);
381 bool MipsFastISel::computeAddress(const Value *Obj, Address &Addr) {
383 const User *U = nullptr;
384 unsigned Opcode = Instruction::UserOp1;
385 if (const Instruction *I = dyn_cast<Instruction>(Obj)) {
386 // Don't walk into other basic blocks unless the object is an alloca from
387 // another block, otherwise it may not have a virtual register assigned.
388 if (FuncInfo.StaticAllocaMap.count(static_cast<const AllocaInst *>(Obj)) ||
389 FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
390 Opcode = I->getOpcode();
393 } else if (isa<ConstantExpr>(Obj))
398 case Instruction::BitCast: {
399 // Look through bitcasts.
400 return computeAddress(U->getOperand(0), Addr);
402 case Instruction::GetElementPtr: {
403 Address SavedAddr = Addr;
404 uint64_t TmpOffset = Addr.getOffset();
405 // Iterate through the GEP folding the constants into offsets where
407 gep_type_iterator GTI = gep_type_begin(U);
408 for (User::const_op_iterator i = U->op_begin() + 1, e = U->op_end(); i != e;
410 const Value *Op = *i;
411 if (StructType *STy = dyn_cast<StructType>(*GTI)) {
412 const StructLayout *SL = DL.getStructLayout(STy);
413 unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
414 TmpOffset += SL->getElementOffset(Idx);
416 uint64_t S = DL.getTypeAllocSize(GTI.getIndexedType());
418 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
419 // Constant-offset addressing.
420 TmpOffset += CI->getSExtValue() * S;
423 if (canFoldAddIntoGEP(U, Op)) {
424 // A compatible add with a constant operand. Fold the constant.
426 cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
427 TmpOffset += CI->getSExtValue() * S;
428 // Iterate on the other operand.
429 Op = cast<AddOperator>(Op)->getOperand(0);
433 goto unsupported_gep;
437 // Try to grab the base operand now.
438 Addr.setOffset(TmpOffset);
439 if (computeAddress(U->getOperand(0), Addr))
441 // We failed, restore everything and try the other options.
446 case Instruction::Alloca: {
447 const AllocaInst *AI = cast<AllocaInst>(Obj);
448 DenseMap<const AllocaInst *, int>::iterator SI =
449 FuncInfo.StaticAllocaMap.find(AI);
450 if (SI != FuncInfo.StaticAllocaMap.end()) {
451 Addr.setKind(Address::FrameIndexBase);
452 Addr.setFI(SI->second);
458 Addr.setReg(getRegForValue(Obj));
459 return Addr.getReg() != 0;
462 bool MipsFastISel::computeCallAddress(const Value *V, Address &Addr) {
463 const GlobalValue *GV = dyn_cast<GlobalValue>(V);
464 if (GV && isa<Function>(GV) && cast<Function>(GV)->isIntrinsic())
468 if (const GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
469 Addr.setGlobalValue(GV);
475 bool MipsFastISel::isTypeLegal(Type *Ty, MVT &VT) {
476 EVT evt = TLI.getValueType(Ty, true);
477 // Only handle simple types.
478 if (evt == MVT::Other || !evt.isSimple())
480 VT = evt.getSimpleVT();
482 // Handle all legal types, i.e. a register that will directly hold this
484 return TLI.isTypeLegal(VT);
487 bool MipsFastISel::isTypeSupported(Type *Ty, MVT &VT) {
488 if (Ty->isVectorTy())
491 if (isTypeLegal(Ty, VT))
494 // If this is a type than can be sign or zero-extended to a basic operation
495 // go ahead and accept it now.
496 if (VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16)
502 bool MipsFastISel::isLoadTypeLegal(Type *Ty, MVT &VT) {
503 if (isTypeLegal(Ty, VT))
505 // We will extend this in a later patch:
506 // If this is a type than can be sign or zero-extended to a basic operation
507 // go ahead and accept it now.
508 if (VT == MVT::i8 || VT == MVT::i16)
512 // Because of how EmitCmp is called with fast-isel, you can
513 // end up with redundant "andi" instructions after the sequences emitted below.
514 // We should try and solve this issue in the future.
516 bool MipsFastISel::emitCmp(unsigned ResultReg, const CmpInst *CI) {
517 const Value *Left = CI->getOperand(0), *Right = CI->getOperand(1);
518 bool IsUnsigned = CI->isUnsigned();
519 unsigned LeftReg = getRegEnsuringSimpleIntegerWidening(Left, IsUnsigned);
522 unsigned RightReg = getRegEnsuringSimpleIntegerWidening(Right, IsUnsigned);
525 CmpInst::Predicate P = CI->getPredicate();
530 case CmpInst::ICMP_EQ: {
531 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
532 emitInst(Mips::XOR, TempReg).addReg(LeftReg).addReg(RightReg);
533 emitInst(Mips::SLTiu, ResultReg).addReg(TempReg).addImm(1);
536 case CmpInst::ICMP_NE: {
537 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
538 emitInst(Mips::XOR, TempReg).addReg(LeftReg).addReg(RightReg);
539 emitInst(Mips::SLTu, ResultReg).addReg(Mips::ZERO).addReg(TempReg);
542 case CmpInst::ICMP_UGT: {
543 emitInst(Mips::SLTu, ResultReg).addReg(RightReg).addReg(LeftReg);
546 case CmpInst::ICMP_ULT: {
547 emitInst(Mips::SLTu, ResultReg).addReg(LeftReg).addReg(RightReg);
550 case CmpInst::ICMP_UGE: {
551 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
552 emitInst(Mips::SLTu, TempReg).addReg(LeftReg).addReg(RightReg);
553 emitInst(Mips::XORi, ResultReg).addReg(TempReg).addImm(1);
556 case CmpInst::ICMP_ULE: {
557 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
558 emitInst(Mips::SLTu, TempReg).addReg(RightReg).addReg(LeftReg);
559 emitInst(Mips::XORi, ResultReg).addReg(TempReg).addImm(1);
562 case CmpInst::ICMP_SGT: {
563 emitInst(Mips::SLT, ResultReg).addReg(RightReg).addReg(LeftReg);
566 case CmpInst::ICMP_SLT: {
567 emitInst(Mips::SLT, ResultReg).addReg(LeftReg).addReg(RightReg);
570 case CmpInst::ICMP_SGE: {
571 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
572 emitInst(Mips::SLT, TempReg).addReg(LeftReg).addReg(RightReg);
573 emitInst(Mips::XORi, ResultReg).addReg(TempReg).addImm(1);
576 case CmpInst::ICMP_SLE: {
577 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
578 emitInst(Mips::SLT, TempReg).addReg(RightReg).addReg(LeftReg);
579 emitInst(Mips::XORi, ResultReg).addReg(TempReg).addImm(1);
582 case CmpInst::FCMP_OEQ:
583 case CmpInst::FCMP_UNE:
584 case CmpInst::FCMP_OLT:
585 case CmpInst::FCMP_OLE:
586 case CmpInst::FCMP_OGT:
587 case CmpInst::FCMP_OGE: {
588 if (UnsupportedFPMode)
590 bool IsFloat = Left->getType()->isFloatTy();
591 bool IsDouble = Left->getType()->isDoubleTy();
592 if (!IsFloat && !IsDouble)
594 unsigned Opc, CondMovOpc;
596 case CmpInst::FCMP_OEQ:
597 Opc = IsFloat ? Mips::C_EQ_S : Mips::C_EQ_D32;
598 CondMovOpc = Mips::MOVT_I;
600 case CmpInst::FCMP_UNE:
601 Opc = IsFloat ? Mips::C_EQ_S : Mips::C_EQ_D32;
602 CondMovOpc = Mips::MOVF_I;
604 case CmpInst::FCMP_OLT:
605 Opc = IsFloat ? Mips::C_OLT_S : Mips::C_OLT_D32;
606 CondMovOpc = Mips::MOVT_I;
608 case CmpInst::FCMP_OLE:
609 Opc = IsFloat ? Mips::C_OLE_S : Mips::C_OLE_D32;
610 CondMovOpc = Mips::MOVT_I;
612 case CmpInst::FCMP_OGT:
613 Opc = IsFloat ? Mips::C_ULE_S : Mips::C_ULE_D32;
614 CondMovOpc = Mips::MOVF_I;
616 case CmpInst::FCMP_OGE:
617 Opc = IsFloat ? Mips::C_ULT_S : Mips::C_ULT_D32;
618 CondMovOpc = Mips::MOVF_I;
621 llvm_unreachable("Only switching of a subset of CCs.");
623 unsigned RegWithZero = createResultReg(&Mips::GPR32RegClass);
624 unsigned RegWithOne = createResultReg(&Mips::GPR32RegClass);
625 emitInst(Mips::ADDiu, RegWithZero).addReg(Mips::ZERO).addImm(0);
626 emitInst(Mips::ADDiu, RegWithOne).addReg(Mips::ZERO).addImm(1);
627 emitInst(Opc).addReg(LeftReg).addReg(RightReg).addReg(
628 Mips::FCC0, RegState::ImplicitDefine);
629 MachineInstrBuilder MI = emitInst(CondMovOpc, ResultReg)
632 .addReg(RegWithZero, RegState::Implicit);
633 MI->tieOperands(0, 3);
639 bool MipsFastISel::emitLoad(MVT VT, unsigned &ResultReg, Address &Addr,
640 unsigned Alignment) {
642 // more cases will be handled here in following patches.
645 switch (VT.SimpleTy) {
647 ResultReg = createResultReg(&Mips::GPR32RegClass);
652 ResultReg = createResultReg(&Mips::GPR32RegClass);
657 ResultReg = createResultReg(&Mips::GPR32RegClass);
662 if (UnsupportedFPMode)
664 ResultReg = createResultReg(&Mips::FGR32RegClass);
669 if (UnsupportedFPMode)
671 ResultReg = createResultReg(&Mips::AFGR64RegClass);
678 if (Addr.isRegBase()) {
679 simplifyAddress(Addr);
680 emitInstLoad(Opc, ResultReg, Addr.getReg(), Addr.getOffset());
683 if (Addr.isFIBase()) {
684 unsigned FI = Addr.getFI();
686 unsigned Offset = Addr.getOffset();
687 MachineFrameInfo &MFI = *MF->getFrameInfo();
688 MachineMemOperand *MMO = MF->getMachineMemOperand(
689 MachinePointerInfo::getFixedStack(FI), MachineMemOperand::MOLoad,
690 MFI.getObjectSize(FI), Align);
691 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc), ResultReg)
700 bool MipsFastISel::emitStore(MVT VT, unsigned SrcReg, Address &Addr,
701 unsigned Alignment) {
703 // more cases will be handled here in following patches.
706 switch (VT.SimpleTy) {
717 if (UnsupportedFPMode)
722 if (UnsupportedFPMode)
729 if (Addr.isRegBase()) {
730 simplifyAddress(Addr);
731 emitInstStore(Opc, SrcReg, Addr.getReg(), Addr.getOffset());
734 if (Addr.isFIBase()) {
735 unsigned FI = Addr.getFI();
737 unsigned Offset = Addr.getOffset();
738 MachineFrameInfo &MFI = *MF->getFrameInfo();
739 MachineMemOperand *MMO = MF->getMachineMemOperand(
740 MachinePointerInfo::getFixedStack(FI), MachineMemOperand::MOLoad,
741 MFI.getObjectSize(FI), Align);
742 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Opc))
752 bool MipsFastISel::selectLogicalOp(const Instruction *I) {
754 if (!isTypeSupported(I->getType(), VT))
758 switch (I->getOpcode()) {
760 llvm_unreachable("Unexpected instruction.");
761 case Instruction::And:
762 ResultReg = emitLogicalOp(ISD::AND, VT, I->getOperand(0), I->getOperand(1));
764 case Instruction::Or:
765 ResultReg = emitLogicalOp(ISD::OR, VT, I->getOperand(0), I->getOperand(1));
767 case Instruction::Xor:
768 ResultReg = emitLogicalOp(ISD::XOR, VT, I->getOperand(0), I->getOperand(1));
775 updateValueMap(I, ResultReg);
779 bool MipsFastISel::selectLoad(const Instruction *I) {
780 // Atomic loads need special handling.
781 if (cast<LoadInst>(I)->isAtomic())
784 // Verify we have a legal type before going any further.
786 if (!isLoadTypeLegal(I->getType(), VT))
789 // See if we can handle this address.
791 if (!computeAddress(I->getOperand(0), Addr))
795 if (!emitLoad(VT, ResultReg, Addr, cast<LoadInst>(I)->getAlignment()))
797 updateValueMap(I, ResultReg);
801 bool MipsFastISel::selectStore(const Instruction *I) {
802 Value *Op0 = I->getOperand(0);
805 // Atomic stores need special handling.
806 if (cast<StoreInst>(I)->isAtomic())
809 // Verify we have a legal type before going any further.
811 if (!isLoadTypeLegal(I->getOperand(0)->getType(), VT))
814 // Get the value to be stored into a register.
815 SrcReg = getRegForValue(Op0);
819 // See if we can handle this address.
821 if (!computeAddress(I->getOperand(1), Addr))
824 if (!emitStore(VT, SrcReg, Addr, cast<StoreInst>(I)->getAlignment()))
830 // This can cause a redundant sltiu to be generated.
831 // FIXME: try and eliminate this in a future patch.
833 bool MipsFastISel::selectBranch(const Instruction *I) {
834 const BranchInst *BI = cast<BranchInst>(I);
835 MachineBasicBlock *BrBB = FuncInfo.MBB;
837 // TBB is the basic block for the case where the comparison is true.
838 // FBB is the basic block for the case where the comparison is false.
839 // if (cond) goto TBB
843 MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
844 MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
846 // For now, just try the simplest case where it's fed by a compare.
847 if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
848 unsigned CondReg = createResultReg(&Mips::GPR32RegClass);
849 if (!emitCmp(CondReg, CI))
851 BuildMI(*BrBB, FuncInfo.InsertPt, DbgLoc, TII.get(Mips::BGTZ))
854 fastEmitBranch(FBB, DbgLoc);
855 FuncInfo.MBB->addSuccessor(TBB);
861 bool MipsFastISel::selectCmp(const Instruction *I) {
862 const CmpInst *CI = cast<CmpInst>(I);
863 unsigned ResultReg = createResultReg(&Mips::GPR32RegClass);
864 if (!emitCmp(ResultReg, CI))
866 updateValueMap(I, ResultReg);
870 // Attempt to fast-select a floating-point extend instruction.
871 bool MipsFastISel::selectFPExt(const Instruction *I) {
872 if (UnsupportedFPMode)
874 Value *Src = I->getOperand(0);
875 EVT SrcVT = TLI.getValueType(Src->getType(), true);
876 EVT DestVT = TLI.getValueType(I->getType(), true);
878 if (SrcVT != MVT::f32 || DestVT != MVT::f64)
882 getRegForValue(Src); // his must be a 32 bit floating point register class
883 // maybe we should handle this differently
887 unsigned DestReg = createResultReg(&Mips::AFGR64RegClass);
888 emitInst(Mips::CVT_D32_S, DestReg).addReg(SrcReg);
889 updateValueMap(I, DestReg);
893 // Attempt to fast-select a floating-point truncate instruction.
894 bool MipsFastISel::selectFPTrunc(const Instruction *I) {
895 if (UnsupportedFPMode)
897 Value *Src = I->getOperand(0);
898 EVT SrcVT = TLI.getValueType(Src->getType(), true);
899 EVT DestVT = TLI.getValueType(I->getType(), true);
901 if (SrcVT != MVT::f64 || DestVT != MVT::f32)
904 unsigned SrcReg = getRegForValue(Src);
908 unsigned DestReg = createResultReg(&Mips::FGR32RegClass);
912 emitInst(Mips::CVT_S_D32, DestReg).addReg(SrcReg);
913 updateValueMap(I, DestReg);
917 // Attempt to fast-select a floating-point-to-integer conversion.
918 bool MipsFastISel::selectFPToInt(const Instruction *I, bool IsSigned) {
919 if (UnsupportedFPMode)
923 return false; // We don't handle this case yet. There is no native
924 // instruction for this but it can be synthesized.
925 Type *DstTy = I->getType();
926 if (!isTypeLegal(DstTy, DstVT))
929 if (DstVT != MVT::i32)
932 Value *Src = I->getOperand(0);
933 Type *SrcTy = Src->getType();
934 if (!isTypeLegal(SrcTy, SrcVT))
937 if (SrcVT != MVT::f32 && SrcVT != MVT::f64)
940 unsigned SrcReg = getRegForValue(Src);
944 // Determine the opcode for the conversion, which takes place
945 // entirely within FPRs.
946 unsigned DestReg = createResultReg(&Mips::GPR32RegClass);
947 unsigned TempReg = createResultReg(&Mips::FGR32RegClass);
950 if (SrcVT == MVT::f32)
951 Opc = Mips::TRUNC_W_S;
953 Opc = Mips::TRUNC_W_D32;
955 // Generate the convert.
956 emitInst(Opc, TempReg).addReg(SrcReg);
958 emitInst(Mips::MFC1, DestReg).addReg(TempReg);
960 updateValueMap(I, DestReg);
964 bool MipsFastISel::processCallArgs(CallLoweringInfo &CLI,
965 SmallVectorImpl<MVT> &OutVTs,
966 unsigned &NumBytes) {
967 CallingConv::ID CC = CLI.CallConv;
968 SmallVector<CCValAssign, 16> ArgLocs;
969 CCState CCInfo(CC, false, *FuncInfo.MF, ArgLocs, *Context);
970 CCInfo.AnalyzeCallOperands(OutVTs, CLI.OutFlags, CCAssignFnForCall(CC));
971 // Get a count of how many bytes are to be pushed on the stack.
972 NumBytes = CCInfo.getNextStackOffset();
973 // This is the minimum argument area used for A0-A3.
977 emitInst(Mips::ADJCALLSTACKDOWN).addImm(16);
980 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
981 CCValAssign &VA = ArgLocs[i];
982 const Value *ArgVal = CLI.OutVals[VA.getValNo()];
983 MVT ArgVT = OutVTs[VA.getValNo()];
987 if (ArgVT == MVT::f32) {
988 VA.convertToReg(Mips::F12);
989 } else if (ArgVT == MVT::f64) {
990 VA.convertToReg(Mips::D6);
993 if ((firstMVT == MVT::f32) || (firstMVT == MVT::f64)) {
994 if (ArgVT == MVT::f32) {
995 VA.convertToReg(Mips::F14);
996 } else if (ArgVT == MVT::f64) {
997 VA.convertToReg(Mips::D7);
1001 if (((ArgVT == MVT::i32) || (ArgVT == MVT::f32)) && VA.isMemLoc()) {
1002 switch (VA.getLocMemOffset()) {
1004 VA.convertToReg(Mips::A0);
1007 VA.convertToReg(Mips::A1);
1010 VA.convertToReg(Mips::A2);
1013 VA.convertToReg(Mips::A3);
1019 unsigned ArgReg = getRegForValue(ArgVal);
1023 // Handle arg promotion: SExt, ZExt, AExt.
1024 switch (VA.getLocInfo()) {
1025 case CCValAssign::Full:
1027 case CCValAssign::AExt:
1028 case CCValAssign::SExt: {
1029 MVT DestVT = VA.getLocVT();
1031 ArgReg = emitIntExt(SrcVT, ArgReg, DestVT, /*isZExt=*/false);
1036 case CCValAssign::ZExt: {
1037 MVT DestVT = VA.getLocVT();
1039 ArgReg = emitIntExt(SrcVT, ArgReg, DestVT, /*isZExt=*/true);
1045 llvm_unreachable("Unknown arg promotion!");
1048 // Now copy/store arg to correct locations.
1049 if (VA.isRegLoc() && !VA.needsCustom()) {
1050 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1051 TII.get(TargetOpcode::COPY), VA.getLocReg()).addReg(ArgReg);
1052 CLI.OutRegs.push_back(VA.getLocReg());
1053 } else if (VA.needsCustom()) {
1054 llvm_unreachable("Mips does not use custom args.");
1058 // FIXME: This path will currently return false. It was copied
1059 // from the AArch64 port and should be essentially fine for Mips too.
1060 // The work to finish up this path will be done in a follow-on patch.
1062 assert(VA.isMemLoc() && "Assuming store on stack.");
1063 // Don't emit stores for undef values.
1064 if (isa<UndefValue>(ArgVal))
1067 // Need to store on the stack.
1068 // FIXME: This alignment is incorrect but this path is disabled
1069 // for now (will return false). We need to determine the right alignment
1070 // based on the normal alignment for the underlying machine type.
1072 unsigned ArgSize = RoundUpToAlignment(ArgVT.getSizeInBits(), 4);
1074 unsigned BEAlign = 0;
1075 if (ArgSize < 8 && !Subtarget->isLittle())
1076 BEAlign = 8 - ArgSize;
1079 Addr.setKind(Address::RegBase);
1080 Addr.setReg(Mips::SP);
1081 Addr.setOffset(VA.getLocMemOffset() + BEAlign);
1083 unsigned Alignment = DL.getABITypeAlignment(ArgVal->getType());
1084 MachineMemOperand *MMO = FuncInfo.MF->getMachineMemOperand(
1085 MachinePointerInfo::getStack(Addr.getOffset()),
1086 MachineMemOperand::MOStore, ArgVT.getStoreSize(), Alignment);
1088 // if (!emitStore(ArgVT, ArgReg, Addr, MMO))
1089 return false; // can't store on the stack yet.
1096 bool MipsFastISel::finishCall(CallLoweringInfo &CLI, MVT RetVT,
1097 unsigned NumBytes) {
1098 CallingConv::ID CC = CLI.CallConv;
1099 emitInst(Mips::ADJCALLSTACKUP).addImm(16);
1100 if (RetVT != MVT::isVoid) {
1101 SmallVector<CCValAssign, 16> RVLocs;
1102 CCState CCInfo(CC, false, *FuncInfo.MF, RVLocs, *Context);
1103 CCInfo.AnalyzeCallResult(RetVT, RetCC_Mips);
1105 // Only handle a single return value.
1106 if (RVLocs.size() != 1)
1108 // Copy all of the result registers out of their specified physreg.
1109 MVT CopyVT = RVLocs[0].getValVT();
1110 // Special handling for extended integers.
1111 if (RetVT == MVT::i1 || RetVT == MVT::i8 || RetVT == MVT::i16)
1114 unsigned ResultReg = createResultReg(TLI.getRegClassFor(CopyVT));
1117 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1118 TII.get(TargetOpcode::COPY),
1119 ResultReg).addReg(RVLocs[0].getLocReg());
1120 CLI.InRegs.push_back(RVLocs[0].getLocReg());
1122 CLI.ResultReg = ResultReg;
1123 CLI.NumResultRegs = 1;
1128 bool MipsFastISel::fastLowerCall(CallLoweringInfo &CLI) {
1129 CallingConv::ID CC = CLI.CallConv;
1130 bool IsTailCall = CLI.IsTailCall;
1131 bool IsVarArg = CLI.IsVarArg;
1132 const Value *Callee = CLI.Callee;
1133 // const char *SymName = CLI.SymName;
1135 // Allow SelectionDAG isel to handle tail calls.
1139 // Let SDISel handle vararg functions.
1143 // FIXME: Only handle *simple* calls for now.
1145 if (CLI.RetTy->isVoidTy())
1146 RetVT = MVT::isVoid;
1147 else if (!isTypeSupported(CLI.RetTy, RetVT))
1150 for (auto Flag : CLI.OutFlags)
1151 if (Flag.isInReg() || Flag.isSRet() || Flag.isNest() || Flag.isByVal())
1154 // Set up the argument vectors.
1155 SmallVector<MVT, 16> OutVTs;
1156 OutVTs.reserve(CLI.OutVals.size());
1158 for (auto *Val : CLI.OutVals) {
1160 if (!isTypeLegal(Val->getType(), VT) &&
1161 !(VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16))
1164 // We don't handle vector parameters yet.
1165 if (VT.isVector() || VT.getSizeInBits() > 64)
1168 OutVTs.push_back(VT);
1172 if (!computeCallAddress(Callee, Addr))
1175 // Handle the arguments now that we've gotten them.
1177 if (!processCallArgs(CLI, OutVTs, NumBytes))
1181 unsigned DestAddress = materializeGV(Addr.getGlobalValue(), MVT::i32);
1182 emitInst(TargetOpcode::COPY, Mips::T9).addReg(DestAddress);
1183 MachineInstrBuilder MIB =
1184 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc, TII.get(Mips::JALR),
1185 Mips::RA).addReg(Mips::T9);
1187 // Add implicit physical register uses to the call.
1188 for (auto Reg : CLI.OutRegs)
1189 MIB.addReg(Reg, RegState::Implicit);
1191 // Add a register mask with the call-preserved registers.
1192 // Proper defs for return values will be added by setPhysRegsDeadExcept().
1193 MIB.addRegMask(TRI.getCallPreservedMask(*FuncInfo.MF, CC));
1197 // Finish off the call including any return values.
1198 return finishCall(CLI, RetVT, NumBytes);
1201 bool MipsFastISel::selectRet(const Instruction *I) {
1202 const Function &F = *I->getParent()->getParent();
1203 const ReturnInst *Ret = cast<ReturnInst>(I);
1205 if (!FuncInfo.CanLowerReturn)
1208 // Build a list of return value registers.
1209 SmallVector<unsigned, 4> RetRegs;
1211 if (Ret->getNumOperands() > 0) {
1212 CallingConv::ID CC = F.getCallingConv();
1213 SmallVector<ISD::OutputArg, 4> Outs;
1214 GetReturnInfo(F.getReturnType(), F.getAttributes(), Outs, TLI);
1215 // Analyze operands of the call, assigning locations to each operand.
1216 SmallVector<CCValAssign, 16> ValLocs;
1217 MipsCCState CCInfo(CC, F.isVarArg(), *FuncInfo.MF, ValLocs,
1219 CCAssignFn *RetCC = RetCC_Mips;
1220 CCInfo.AnalyzeReturn(Outs, RetCC);
1222 // Only handle a single return value for now.
1223 if (ValLocs.size() != 1)
1226 CCValAssign &VA = ValLocs[0];
1227 const Value *RV = Ret->getOperand(0);
1229 // Don't bother handling odd stuff for now.
1230 if ((VA.getLocInfo() != CCValAssign::Full) &&
1231 (VA.getLocInfo() != CCValAssign::BCvt))
1234 // Only handle register returns for now.
1238 unsigned Reg = getRegForValue(RV);
1242 unsigned SrcReg = Reg + VA.getValNo();
1243 unsigned DestReg = VA.getLocReg();
1244 // Avoid a cross-class copy. This is very unlikely.
1245 if (!MRI.getRegClass(SrcReg)->contains(DestReg))
1248 EVT RVEVT = TLI.getValueType(RV->getType());
1249 if (!RVEVT.isSimple())
1252 if (RVEVT.isVector())
1255 MVT RVVT = RVEVT.getSimpleVT();
1256 if (RVVT == MVT::f128)
1259 MVT DestVT = VA.getValVT();
1260 // Special handling for extended integers.
1261 if (RVVT != DestVT) {
1262 if (RVVT != MVT::i1 && RVVT != MVT::i8 && RVVT != MVT::i16)
1265 if (Outs[0].Flags.isZExt() || Outs[0].Flags.isSExt()) {
1266 bool IsZExt = Outs[0].Flags.isZExt();
1267 SrcReg = emitIntExt(RVVT, SrcReg, DestVT, IsZExt);
1274 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DbgLoc,
1275 TII.get(TargetOpcode::COPY), DestReg).addReg(SrcReg);
1277 // Add register to return instruction.
1278 RetRegs.push_back(VA.getLocReg());
1280 MachineInstrBuilder MIB = emitInst(Mips::RetRA);
1281 for (unsigned i = 0, e = RetRegs.size(); i != e; ++i)
1282 MIB.addReg(RetRegs[i], RegState::Implicit);
1286 bool MipsFastISel::selectTrunc(const Instruction *I) {
1287 // The high bits for a type smaller than the register size are assumed to be
1289 Value *Op = I->getOperand(0);
1292 SrcVT = TLI.getValueType(Op->getType(), true);
1293 DestVT = TLI.getValueType(I->getType(), true);
1295 if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
1297 if (DestVT != MVT::i16 && DestVT != MVT::i8 && DestVT != MVT::i1)
1300 unsigned SrcReg = getRegForValue(Op);
1304 // Because the high bits are undefined, a truncate doesn't generate
1306 updateValueMap(I, SrcReg);
1309 bool MipsFastISel::selectIntExt(const Instruction *I) {
1310 Type *DestTy = I->getType();
1311 Value *Src = I->getOperand(0);
1312 Type *SrcTy = Src->getType();
1314 bool isZExt = isa<ZExtInst>(I);
1315 unsigned SrcReg = getRegForValue(Src);
1319 EVT SrcEVT, DestEVT;
1320 SrcEVT = TLI.getValueType(SrcTy, true);
1321 DestEVT = TLI.getValueType(DestTy, true);
1322 if (!SrcEVT.isSimple())
1324 if (!DestEVT.isSimple())
1327 MVT SrcVT = SrcEVT.getSimpleVT();
1328 MVT DestVT = DestEVT.getSimpleVT();
1329 unsigned ResultReg = createResultReg(&Mips::GPR32RegClass);
1331 if (!emitIntExt(SrcVT, SrcReg, DestVT, ResultReg, isZExt))
1333 updateValueMap(I, ResultReg);
1336 bool MipsFastISel::emitIntSExt32r1(MVT SrcVT, unsigned SrcReg, MVT DestVT,
1339 switch (SrcVT.SimpleTy) {
1349 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
1350 emitInst(Mips::SLL, TempReg).addReg(SrcReg).addImm(ShiftAmt);
1351 emitInst(Mips::SRA, DestReg).addReg(TempReg).addImm(ShiftAmt);
1355 bool MipsFastISel::emitIntSExt32r2(MVT SrcVT, unsigned SrcReg, MVT DestVT,
1357 switch (SrcVT.SimpleTy) {
1361 emitInst(Mips::SEB, DestReg).addReg(SrcReg);
1364 emitInst(Mips::SEH, DestReg).addReg(SrcReg);
1370 bool MipsFastISel::emitIntSExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
1372 if ((DestVT != MVT::i32) && (DestVT != MVT::i16))
1374 if (Subtarget->hasMips32r2())
1375 return emitIntSExt32r2(SrcVT, SrcReg, DestVT, DestReg);
1376 return emitIntSExt32r1(SrcVT, SrcReg, DestVT, DestReg);
1379 bool MipsFastISel::emitIntZExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
1381 switch (SrcVT.SimpleTy) {
1385 emitInst(Mips::ANDi, DestReg).addReg(SrcReg).addImm(1);
1388 emitInst(Mips::ANDi, DestReg).addReg(SrcReg).addImm(0xff);
1391 emitInst(Mips::ANDi, DestReg).addReg(SrcReg).addImm(0xffff);
1397 bool MipsFastISel::emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
1398 unsigned DestReg, bool IsZExt) {
1399 // FastISel does not have plumbing to deal with extensions where the SrcVT or
1400 // DestVT are odd things, so test to make sure that they are both types we can
1401 // handle (i1/i8/i16/i32 for SrcVT and i8/i16/i32/i64 for DestVT), otherwise
1402 // bail out to SelectionDAG.
1403 if (((DestVT != MVT::i8) && (DestVT != MVT::i16) && (DestVT != MVT::i32)) ||
1404 ((SrcVT != MVT::i1) && (SrcVT != MVT::i8) && (SrcVT != MVT::i16)))
1407 return emitIntZExt(SrcVT, SrcReg, DestVT, DestReg);
1408 return emitIntSExt(SrcVT, SrcReg, DestVT, DestReg);
1411 unsigned MipsFastISel::emitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
1413 unsigned DestReg = createResultReg(&Mips::GPR32RegClass);
1414 bool Success = emitIntExt(SrcVT, SrcReg, DestVT, DestReg, isZExt);
1415 return Success ? DestReg : 0;
1418 bool MipsFastISel::selectShift(const Instruction *I) {
1421 if (!isTypeSupported(I->getType(), RetVT))
1424 unsigned ResultReg = createResultReg(&Mips::GPR32RegClass);
1428 unsigned Opcode = I->getOpcode();
1429 const Value *Op0 = I->getOperand(0);
1430 unsigned Op0Reg = getRegForValue(Op0);
1434 // If AShr or LShr, then we need to make sure the operand0 is sign extended.
1435 if (Opcode == Instruction::AShr || Opcode == Instruction::LShr) {
1436 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
1440 MVT Op0MVT = TLI.getValueType(Op0->getType(), true).getSimpleVT();
1441 bool IsZExt = Opcode == Instruction::LShr;
1442 if (!emitIntExt(Op0MVT, Op0Reg, MVT::i32, TempReg, IsZExt))
1448 if (const auto *C = dyn_cast<ConstantInt>(I->getOperand(1))) {
1449 uint64_t ShiftVal = C->getZExtValue();
1453 llvm_unreachable("Unexpected instruction.");
1454 case Instruction::Shl:
1457 case Instruction::AShr:
1460 case Instruction::LShr:
1465 emitInst(Opcode, ResultReg).addReg(Op0Reg).addImm(ShiftVal);
1466 updateValueMap(I, ResultReg);
1470 unsigned Op1Reg = getRegForValue(I->getOperand(1));
1476 llvm_unreachable("Unexpected instruction.");
1477 case Instruction::Shl:
1478 Opcode = Mips::SLLV;
1480 case Instruction::AShr:
1481 Opcode = Mips::SRAV;
1483 case Instruction::LShr:
1484 Opcode = Mips::SRLV;
1488 emitInst(Opcode, ResultReg).addReg(Op0Reg).addReg(Op1Reg);
1489 updateValueMap(I, ResultReg);
1493 bool MipsFastISel::fastSelectInstruction(const Instruction *I) {
1494 if (!TargetSupported)
1496 switch (I->getOpcode()) {
1499 case Instruction::Load:
1500 return selectLoad(I);
1501 case Instruction::Store:
1502 return selectStore(I);
1503 case Instruction::Shl:
1504 case Instruction::LShr:
1505 case Instruction::AShr:
1506 return selectShift(I);
1507 case Instruction::And:
1508 case Instruction::Or:
1509 case Instruction::Xor:
1510 return selectLogicalOp(I);
1511 case Instruction::Br:
1512 return selectBranch(I);
1513 case Instruction::Ret:
1514 return selectRet(I);
1515 case Instruction::Trunc:
1516 return selectTrunc(I);
1517 case Instruction::ZExt:
1518 case Instruction::SExt:
1519 return selectIntExt(I);
1520 case Instruction::FPTrunc:
1521 return selectFPTrunc(I);
1522 case Instruction::FPExt:
1523 return selectFPExt(I);
1524 case Instruction::FPToSI:
1525 return selectFPToInt(I, /*isSigned*/ true);
1526 case Instruction::FPToUI:
1527 return selectFPToInt(I, /*isSigned*/ false);
1528 case Instruction::ICmp:
1529 case Instruction::FCmp:
1530 return selectCmp(I);
1535 unsigned MipsFastISel::getRegEnsuringSimpleIntegerWidening(const Value *V,
1537 unsigned VReg = getRegForValue(V);
1540 MVT VMVT = TLI.getValueType(V->getType(), true).getSimpleVT();
1541 if ((VMVT == MVT::i8) || (VMVT == MVT::i16)) {
1542 unsigned TempReg = createResultReg(&Mips::GPR32RegClass);
1543 if (!emitIntExt(VMVT, VReg, MVT::i32, TempReg, IsUnsigned))
1550 void MipsFastISel::simplifyAddress(Address &Addr) {
1551 if (!isInt<16>(Addr.getOffset())) {
1553 materialize32BitInt(Addr.getOffset(), &Mips::GPR32RegClass);
1554 unsigned DestReg = createResultReg(&Mips::GPR32RegClass);
1555 emitInst(Mips::ADDu, DestReg).addReg(TempReg).addReg(Addr.getReg());
1556 Addr.setReg(DestReg);
1562 FastISel *Mips::createFastISel(FunctionLoweringInfo &funcInfo,
1563 const TargetLibraryInfo *libInfo) {
1564 return new MipsFastISel(funcInfo, libInfo);