1 //===-- ARMFastISel.cpp - ARM FastISel implementation ---------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the ARM-specific support for the FastISel class. Some
11 // of the target-specific code is generated by tablegen in the file
12 // ARMGenFastISel.inc, which is #included here.
14 //===----------------------------------------------------------------------===//
17 #include "ARMBaseInstrInfo.h"
18 #include "ARMCallingConv.h"
19 #include "ARMConstantPoolValue.h"
20 #include "ARMSubtarget.h"
21 #include "ARMTargetMachine.h"
22 #include "MCTargetDesc/ARMAddressingModes.h"
23 #include "llvm/ADT/STLExtras.h"
24 #include "llvm/CodeGen/Analysis.h"
25 #include "llvm/CodeGen/FastISel.h"
26 #include "llvm/CodeGen/FunctionLoweringInfo.h"
27 #include "llvm/CodeGen/MachineConstantPool.h"
28 #include "llvm/CodeGen/MachineFrameInfo.h"
29 #include "llvm/CodeGen/MachineInstrBuilder.h"
30 #include "llvm/CodeGen/MachineMemOperand.h"
31 #include "llvm/CodeGen/MachineModuleInfo.h"
32 #include "llvm/CodeGen/MachineRegisterInfo.h"
33 #include "llvm/IR/CallingConv.h"
34 #include "llvm/IR/DataLayout.h"
35 #include "llvm/IR/DerivedTypes.h"
36 #include "llvm/IR/GlobalVariable.h"
37 #include "llvm/IR/Instructions.h"
38 #include "llvm/IR/IntrinsicInst.h"
39 #include "llvm/IR/Module.h"
40 #include "llvm/IR/Operator.h"
41 #include "llvm/Support/CallSite.h"
42 #include "llvm/Support/CommandLine.h"
43 #include "llvm/Support/ErrorHandling.h"
44 #include "llvm/Support/GetElementPtrTypeIterator.h"
45 #include "llvm/Target/TargetInstrInfo.h"
46 #include "llvm/Target/TargetLowering.h"
47 #include "llvm/Target/TargetMachine.h"
48 #include "llvm/Target/TargetOptions.h"
51 extern cl::opt<bool> EnableARMLongCalls;
55 // All possible address modes, plus some.
56 typedef struct Address {
69 // Innocuous defaults for our address.
71 : BaseType(RegBase), Offset(0) {
76 class ARMFastISel : public FastISel {
78 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
79 /// make the right decision when generating code for different targets.
80 const ARMSubtarget *Subtarget;
81 const TargetMachine &TM;
82 const TargetInstrInfo &TII;
83 const TargetLowering &TLI;
86 // Convenience variables to avoid some queries.
91 explicit ARMFastISel(FunctionLoweringInfo &funcInfo,
92 const TargetLibraryInfo *libInfo)
93 : FastISel(funcInfo, libInfo),
94 TM(funcInfo.MF->getTarget()),
95 TII(*TM.getInstrInfo()),
96 TLI(*TM.getTargetLowering()) {
97 Subtarget = &TM.getSubtarget<ARMSubtarget>();
98 AFI = funcInfo.MF->getInfo<ARMFunctionInfo>();
99 isThumb2 = AFI->isThumbFunction();
100 Context = &funcInfo.Fn->getContext();
103 // Code from FastISel.cpp.
105 unsigned FastEmitInst_(unsigned MachineInstOpcode,
106 const TargetRegisterClass *RC);
107 unsigned FastEmitInst_r(unsigned MachineInstOpcode,
108 const TargetRegisterClass *RC,
109 unsigned Op0, bool Op0IsKill);
110 unsigned FastEmitInst_rr(unsigned MachineInstOpcode,
111 const TargetRegisterClass *RC,
112 unsigned Op0, bool Op0IsKill,
113 unsigned Op1, bool Op1IsKill);
114 unsigned FastEmitInst_rrr(unsigned MachineInstOpcode,
115 const TargetRegisterClass *RC,
116 unsigned Op0, bool Op0IsKill,
117 unsigned Op1, bool Op1IsKill,
118 unsigned Op2, bool Op2IsKill);
119 unsigned FastEmitInst_ri(unsigned MachineInstOpcode,
120 const TargetRegisterClass *RC,
121 unsigned Op0, bool Op0IsKill,
123 unsigned FastEmitInst_rf(unsigned MachineInstOpcode,
124 const TargetRegisterClass *RC,
125 unsigned Op0, bool Op0IsKill,
126 const ConstantFP *FPImm);
127 unsigned FastEmitInst_rri(unsigned MachineInstOpcode,
128 const TargetRegisterClass *RC,
129 unsigned Op0, bool Op0IsKill,
130 unsigned Op1, bool Op1IsKill,
132 unsigned FastEmitInst_i(unsigned MachineInstOpcode,
133 const TargetRegisterClass *RC,
135 unsigned FastEmitInst_ii(unsigned MachineInstOpcode,
136 const TargetRegisterClass *RC,
137 uint64_t Imm1, uint64_t Imm2);
139 unsigned FastEmitInst_extractsubreg(MVT RetVT,
140 unsigned Op0, bool Op0IsKill,
143 // Backend specific FastISel code.
145 virtual bool TargetSelectInstruction(const Instruction *I);
146 virtual unsigned TargetMaterializeConstant(const Constant *C);
147 virtual unsigned TargetMaterializeAlloca(const AllocaInst *AI);
148 virtual bool tryToFoldLoadIntoMI(MachineInstr *MI, unsigned OpNo,
150 virtual bool FastLowerArguments();
152 #include "ARMGenFastISel.inc"
154 // Instruction selection routines.
156 bool SelectLoad(const Instruction *I);
157 bool SelectStore(const Instruction *I);
158 bool SelectBranch(const Instruction *I);
159 bool SelectIndirectBr(const Instruction *I);
160 bool SelectCmp(const Instruction *I);
161 bool SelectFPExt(const Instruction *I);
162 bool SelectFPTrunc(const Instruction *I);
163 bool SelectBinaryIntOp(const Instruction *I, unsigned ISDOpcode);
164 bool SelectBinaryFPOp(const Instruction *I, unsigned ISDOpcode);
165 bool SelectIToFP(const Instruction *I, bool isSigned);
166 bool SelectFPToI(const Instruction *I, bool isSigned);
167 bool SelectDiv(const Instruction *I, bool isSigned);
168 bool SelectRem(const Instruction *I, bool isSigned);
169 bool SelectCall(const Instruction *I, const char *IntrMemName);
170 bool SelectIntrinsicCall(const IntrinsicInst &I);
171 bool SelectSelect(const Instruction *I);
172 bool SelectRet(const Instruction *I);
173 bool SelectTrunc(const Instruction *I);
174 bool SelectIntExt(const Instruction *I);
175 bool SelectShift(const Instruction *I, ARM_AM::ShiftOpc ShiftTy);
179 unsigned constrainOperandRegClass(const MCInstrDesc &II, unsigned OpNum,
181 bool isTypeLegal(Type *Ty, MVT &VT);
182 bool isLoadTypeLegal(Type *Ty, MVT &VT);
183 bool ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
185 bool ARMEmitLoad(MVT VT, unsigned &ResultReg, Address &Addr,
186 unsigned Alignment = 0, bool isZExt = true,
187 bool allocReg = true);
188 bool ARMEmitStore(MVT VT, unsigned SrcReg, Address &Addr,
189 unsigned Alignment = 0);
190 bool ARMComputeAddress(const Value *Obj, Address &Addr);
191 void ARMSimplifyAddress(Address &Addr, MVT VT, bool useAM3);
192 bool ARMIsMemCpySmall(uint64_t Len);
193 bool ARMTryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len,
195 unsigned ARMEmitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT, bool isZExt);
196 unsigned ARMMaterializeFP(const ConstantFP *CFP, MVT VT);
197 unsigned ARMMaterializeInt(const Constant *C, MVT VT);
198 unsigned ARMMaterializeGV(const GlobalValue *GV, MVT VT);
199 unsigned ARMMoveToFPReg(MVT VT, unsigned SrcReg);
200 unsigned ARMMoveToIntReg(MVT VT, unsigned SrcReg);
201 unsigned ARMSelectCallOp(bool UseReg);
202 unsigned ARMLowerPICELF(const GlobalValue *GV, unsigned Align, MVT VT);
204 // Call handling routines.
206 CCAssignFn *CCAssignFnForCall(CallingConv::ID CC,
209 bool ProcessCallArgs(SmallVectorImpl<Value*> &Args,
210 SmallVectorImpl<unsigned> &ArgRegs,
211 SmallVectorImpl<MVT> &ArgVTs,
212 SmallVectorImpl<ISD::ArgFlagsTy> &ArgFlags,
213 SmallVectorImpl<unsigned> &RegArgs,
217 unsigned getLibcallReg(const Twine &Name);
218 bool FinishCall(MVT RetVT, SmallVectorImpl<unsigned> &UsedRegs,
219 const Instruction *I, CallingConv::ID CC,
220 unsigned &NumBytes, bool isVarArg);
221 bool ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call);
223 // OptionalDef handling routines.
225 bool isARMNEONPred(const MachineInstr *MI);
226 bool DefinesOptionalPredicate(MachineInstr *MI, bool *CPSR);
227 const MachineInstrBuilder &AddOptionalDefs(const MachineInstrBuilder &MIB);
228 void AddLoadStoreOperands(MVT VT, Address &Addr,
229 const MachineInstrBuilder &MIB,
230 unsigned Flags, bool useAM3);
233 } // end anonymous namespace
235 #include "ARMGenCallingConv.inc"
237 // DefinesOptionalPredicate - This is different from DefinesPredicate in that
238 // we don't care about implicit defs here, just places we'll need to add a
239 // default CCReg argument. Sets CPSR if we're setting CPSR instead of CCR.
240 bool ARMFastISel::DefinesOptionalPredicate(MachineInstr *MI, bool *CPSR) {
241 if (!MI->hasOptionalDef())
244 // Look to see if our OptionalDef is defining CPSR or CCR.
245 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
246 const MachineOperand &MO = MI->getOperand(i);
247 if (!MO.isReg() || !MO.isDef()) continue;
248 if (MO.getReg() == ARM::CPSR)
254 bool ARMFastISel::isARMNEONPred(const MachineInstr *MI) {
255 const MCInstrDesc &MCID = MI->getDesc();
257 // If we're a thumb2 or not NEON function we were handled via isPredicable.
258 if ((MCID.TSFlags & ARMII::DomainMask) != ARMII::DomainNEON ||
259 AFI->isThumb2Function())
262 for (unsigned i = 0, e = MCID.getNumOperands(); i != e; ++i)
263 if (MCID.OpInfo[i].isPredicate())
269 // If the machine is predicable go ahead and add the predicate operands, if
270 // it needs default CC operands add those.
271 // TODO: If we want to support thumb1 then we'll need to deal with optional
272 // CPSR defs that need to be added before the remaining operands. See s_cc_out
273 // for descriptions why.
274 const MachineInstrBuilder &
275 ARMFastISel::AddOptionalDefs(const MachineInstrBuilder &MIB) {
276 MachineInstr *MI = &*MIB;
278 // Do we use a predicate? or...
279 // Are we NEON in ARM mode and have a predicate operand? If so, I know
280 // we're not predicable but add it anyways.
281 if (TII.isPredicable(MI) || isARMNEONPred(MI))
284 // Do we optionally set a predicate? Preds is size > 0 iff the predicate
285 // defines CPSR. All other OptionalDefines in ARM are the CCR register.
287 if (DefinesOptionalPredicate(MI, &CPSR)) {
296 unsigned ARMFastISel::constrainOperandRegClass(const MCInstrDesc &II,
297 unsigned Op, unsigned OpNum) {
298 if (TargetRegisterInfo::isVirtualRegister(Op)) {
299 const TargetRegisterClass *RegClass =
300 TII.getRegClass(II, OpNum, &TRI, *FuncInfo.MF);
301 if (!MRI.constrainRegClass(Op, RegClass)) {
302 // If it's not legal to COPY between the register classes, something
303 // has gone very wrong before we got here.
304 unsigned NewOp = createResultReg(RegClass);
305 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
306 TII.get(TargetOpcode::COPY), NewOp).addReg(Op));
313 unsigned ARMFastISel::FastEmitInst_(unsigned MachineInstOpcode,
314 const TargetRegisterClass* RC) {
315 unsigned ResultReg = createResultReg(RC);
316 const MCInstrDesc &II = TII.get(MachineInstOpcode);
318 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg));
322 unsigned ARMFastISel::FastEmitInst_r(unsigned MachineInstOpcode,
323 const TargetRegisterClass *RC,
324 unsigned Op0, bool Op0IsKill) {
325 unsigned ResultReg = createResultReg(RC);
326 const MCInstrDesc &II = TII.get(MachineInstOpcode);
328 // Make sure the input operand is sufficiently constrained to be legal
329 // for this instruction.
330 Op0 = constrainOperandRegClass(II, Op0, 1);
331 if (II.getNumDefs() >= 1) {
332 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
333 .addReg(Op0, Op0IsKill * RegState::Kill));
335 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
336 .addReg(Op0, Op0IsKill * RegState::Kill));
337 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
338 TII.get(TargetOpcode::COPY), ResultReg)
339 .addReg(II.ImplicitDefs[0]));
344 unsigned ARMFastISel::FastEmitInst_rr(unsigned MachineInstOpcode,
345 const TargetRegisterClass *RC,
346 unsigned Op0, bool Op0IsKill,
347 unsigned Op1, bool Op1IsKill) {
348 unsigned ResultReg = createResultReg(RC);
349 const MCInstrDesc &II = TII.get(MachineInstOpcode);
351 // Make sure the input operands are sufficiently constrained to be legal
352 // for this instruction.
353 Op0 = constrainOperandRegClass(II, Op0, 1);
354 Op1 = constrainOperandRegClass(II, Op1, 2);
356 if (II.getNumDefs() >= 1) {
357 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
358 .addReg(Op0, Op0IsKill * RegState::Kill)
359 .addReg(Op1, Op1IsKill * RegState::Kill));
361 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
362 .addReg(Op0, Op0IsKill * RegState::Kill)
363 .addReg(Op1, Op1IsKill * RegState::Kill));
364 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
365 TII.get(TargetOpcode::COPY), ResultReg)
366 .addReg(II.ImplicitDefs[0]));
371 unsigned ARMFastISel::FastEmitInst_rrr(unsigned MachineInstOpcode,
372 const TargetRegisterClass *RC,
373 unsigned Op0, bool Op0IsKill,
374 unsigned Op1, bool Op1IsKill,
375 unsigned Op2, bool Op2IsKill) {
376 unsigned ResultReg = createResultReg(RC);
377 const MCInstrDesc &II = TII.get(MachineInstOpcode);
379 // Make sure the input operands are sufficiently constrained to be legal
380 // for this instruction.
381 Op0 = constrainOperandRegClass(II, Op0, 1);
382 Op1 = constrainOperandRegClass(II, Op1, 2);
383 Op2 = constrainOperandRegClass(II, Op1, 3);
385 if (II.getNumDefs() >= 1) {
386 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
387 .addReg(Op0, Op0IsKill * RegState::Kill)
388 .addReg(Op1, Op1IsKill * RegState::Kill)
389 .addReg(Op2, Op2IsKill * RegState::Kill));
391 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
392 .addReg(Op0, Op0IsKill * RegState::Kill)
393 .addReg(Op1, Op1IsKill * RegState::Kill)
394 .addReg(Op2, Op2IsKill * RegState::Kill));
395 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
396 TII.get(TargetOpcode::COPY), ResultReg)
397 .addReg(II.ImplicitDefs[0]));
402 unsigned ARMFastISel::FastEmitInst_ri(unsigned MachineInstOpcode,
403 const TargetRegisterClass *RC,
404 unsigned Op0, bool Op0IsKill,
406 unsigned ResultReg = createResultReg(RC);
407 const MCInstrDesc &II = TII.get(MachineInstOpcode);
409 // Make sure the input operand is sufficiently constrained to be legal
410 // for this instruction.
411 Op0 = constrainOperandRegClass(II, Op0, 1);
412 if (II.getNumDefs() >= 1) {
413 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
414 .addReg(Op0, Op0IsKill * RegState::Kill)
417 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
418 .addReg(Op0, Op0IsKill * RegState::Kill)
420 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
421 TII.get(TargetOpcode::COPY), ResultReg)
422 .addReg(II.ImplicitDefs[0]));
427 unsigned ARMFastISel::FastEmitInst_rf(unsigned MachineInstOpcode,
428 const TargetRegisterClass *RC,
429 unsigned Op0, bool Op0IsKill,
430 const ConstantFP *FPImm) {
431 unsigned ResultReg = createResultReg(RC);
432 const MCInstrDesc &II = TII.get(MachineInstOpcode);
434 // Make sure the input operand is sufficiently constrained to be legal
435 // for this instruction.
436 Op0 = constrainOperandRegClass(II, Op0, 1);
437 if (II.getNumDefs() >= 1) {
438 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
439 .addReg(Op0, Op0IsKill * RegState::Kill)
442 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
443 .addReg(Op0, Op0IsKill * RegState::Kill)
445 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
446 TII.get(TargetOpcode::COPY), ResultReg)
447 .addReg(II.ImplicitDefs[0]));
452 unsigned ARMFastISel::FastEmitInst_rri(unsigned MachineInstOpcode,
453 const TargetRegisterClass *RC,
454 unsigned Op0, bool Op0IsKill,
455 unsigned Op1, bool Op1IsKill,
457 unsigned ResultReg = createResultReg(RC);
458 const MCInstrDesc &II = TII.get(MachineInstOpcode);
460 // Make sure the input operands are sufficiently constrained to be legal
461 // for this instruction.
462 Op0 = constrainOperandRegClass(II, Op0, 1);
463 Op1 = constrainOperandRegClass(II, Op1, 2);
464 if (II.getNumDefs() >= 1) {
465 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
466 .addReg(Op0, Op0IsKill * RegState::Kill)
467 .addReg(Op1, Op1IsKill * RegState::Kill)
470 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
471 .addReg(Op0, Op0IsKill * RegState::Kill)
472 .addReg(Op1, Op1IsKill * RegState::Kill)
474 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
475 TII.get(TargetOpcode::COPY), ResultReg)
476 .addReg(II.ImplicitDefs[0]));
481 unsigned ARMFastISel::FastEmitInst_i(unsigned MachineInstOpcode,
482 const TargetRegisterClass *RC,
484 unsigned ResultReg = createResultReg(RC);
485 const MCInstrDesc &II = TII.get(MachineInstOpcode);
487 if (II.getNumDefs() >= 1) {
488 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
491 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
493 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
494 TII.get(TargetOpcode::COPY), ResultReg)
495 .addReg(II.ImplicitDefs[0]));
500 unsigned ARMFastISel::FastEmitInst_ii(unsigned MachineInstOpcode,
501 const TargetRegisterClass *RC,
502 uint64_t Imm1, uint64_t Imm2) {
503 unsigned ResultReg = createResultReg(RC);
504 const MCInstrDesc &II = TII.get(MachineInstOpcode);
506 if (II.getNumDefs() >= 1) {
507 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
508 .addImm(Imm1).addImm(Imm2));
510 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
511 .addImm(Imm1).addImm(Imm2));
512 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
513 TII.get(TargetOpcode::COPY),
515 .addReg(II.ImplicitDefs[0]));
520 unsigned ARMFastISel::FastEmitInst_extractsubreg(MVT RetVT,
521 unsigned Op0, bool Op0IsKill,
523 unsigned ResultReg = createResultReg(TLI.getRegClassFor(RetVT));
524 assert(TargetRegisterInfo::isVirtualRegister(Op0) &&
525 "Cannot yet extract from physregs");
527 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
528 DL, TII.get(TargetOpcode::COPY), ResultReg)
529 .addReg(Op0, getKillRegState(Op0IsKill), Idx));
533 // TODO: Don't worry about 64-bit now, but when this is fixed remove the
534 // checks from the various callers.
535 unsigned ARMFastISel::ARMMoveToFPReg(MVT VT, unsigned SrcReg) {
536 if (VT == MVT::f64) return 0;
538 unsigned MoveReg = createResultReg(TLI.getRegClassFor(VT));
539 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
540 TII.get(ARM::VMOVSR), MoveReg)
545 unsigned ARMFastISel::ARMMoveToIntReg(MVT VT, unsigned SrcReg) {
546 if (VT == MVT::i64) return 0;
548 unsigned MoveReg = createResultReg(TLI.getRegClassFor(VT));
549 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
550 TII.get(ARM::VMOVRS), MoveReg)
555 // For double width floating point we need to materialize two constants
556 // (the high and the low) into integer registers then use a move to get
557 // the combined constant into an FP reg.
558 unsigned ARMFastISel::ARMMaterializeFP(const ConstantFP *CFP, MVT VT) {
559 const APFloat Val = CFP->getValueAPF();
560 bool is64bit = VT == MVT::f64;
562 // This checks to see if we can use VFP3 instructions to materialize
563 // a constant, otherwise we have to go through the constant pool.
564 if (TLI.isFPImmLegal(Val, VT)) {
568 Imm = ARM_AM::getFP64Imm(Val);
571 Imm = ARM_AM::getFP32Imm(Val);
574 unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
575 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
581 // Require VFP2 for loading fp constants.
582 if (!Subtarget->hasVFP2()) return false;
584 // MachineConstantPool wants an explicit alignment.
585 unsigned Align = TD.getPrefTypeAlignment(CFP->getType());
587 // TODO: Figure out if this is correct.
588 Align = TD.getTypeAllocSize(CFP->getType());
590 unsigned Idx = MCP.getConstantPoolIndex(cast<Constant>(CFP), Align);
591 unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
592 unsigned Opc = is64bit ? ARM::VLDRD : ARM::VLDRS;
594 // The extra reg is for addrmode5.
595 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
597 .addConstantPoolIndex(Idx)
602 unsigned ARMFastISel::ARMMaterializeInt(const Constant *C, MVT VT) {
604 if (VT != MVT::i32 && VT != MVT::i16 && VT != MVT::i8 && VT != MVT::i1)
607 // If we can do this in a single instruction without a constant pool entry
609 const ConstantInt *CI = cast<ConstantInt>(C);
610 if (Subtarget->hasV6T2Ops() && isUInt<16>(CI->getZExtValue())) {
611 unsigned Opc = isThumb2 ? ARM::t2MOVi16 : ARM::MOVi16;
612 const TargetRegisterClass *RC = isThumb2 ? &ARM::rGPRRegClass :
614 unsigned ImmReg = createResultReg(RC);
615 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
616 TII.get(Opc), ImmReg)
617 .addImm(CI->getZExtValue()));
621 // Use MVN to emit negative constants.
622 if (VT == MVT::i32 && Subtarget->hasV6T2Ops() && CI->isNegative()) {
623 unsigned Imm = (unsigned)~(CI->getSExtValue());
624 bool UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
625 (ARM_AM::getSOImmVal(Imm) != -1);
627 unsigned Opc = isThumb2 ? ARM::t2MVNi : ARM::MVNi;
628 unsigned ImmReg = createResultReg(TLI.getRegClassFor(MVT::i32));
629 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
630 TII.get(Opc), ImmReg)
636 // Load from constant pool. For now 32-bit only.
640 unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
642 // MachineConstantPool wants an explicit alignment.
643 unsigned Align = TD.getPrefTypeAlignment(C->getType());
645 // TODO: Figure out if this is correct.
646 Align = TD.getTypeAllocSize(C->getType());
648 unsigned Idx = MCP.getConstantPoolIndex(C, Align);
651 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
652 TII.get(ARM::t2LDRpci), DestReg)
653 .addConstantPoolIndex(Idx));
655 // The extra immediate is for addrmode2.
656 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
657 TII.get(ARM::LDRcp), DestReg)
658 .addConstantPoolIndex(Idx)
664 unsigned ARMFastISel::ARMMaterializeGV(const GlobalValue *GV, MVT VT) {
665 // For now 32-bit only.
666 if (VT != MVT::i32) return 0;
668 Reloc::Model RelocM = TM.getRelocationModel();
669 bool IsIndirect = Subtarget->GVIsIndirectSymbol(GV, RelocM);
670 const TargetRegisterClass *RC = isThumb2 ?
671 (const TargetRegisterClass*)&ARM::rGPRRegClass :
672 (const TargetRegisterClass*)&ARM::GPRRegClass;
673 unsigned DestReg = createResultReg(RC);
675 // FastISel TLS support on non-Darwin is broken, punt to SelectionDAG.
676 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
677 bool IsThreadLocal = GVar && GVar->isThreadLocal();
678 if (!Subtarget->isTargetDarwin() && IsThreadLocal) return 0;
680 // Use movw+movt when possible, it avoids constant pool entries.
681 // Darwin targets don't support movt with Reloc::Static, see
682 // ARMTargetLowering::LowerGlobalAddressDarwin. Other targets only support
683 // static movt relocations.
684 if (Subtarget->useMovt() &&
685 Subtarget->isTargetDarwin() == (RelocM != Reloc::Static)) {
689 Opc = isThumb2 ? ARM::t2MOV_ga_pcrel : ARM::MOV_ga_pcrel;
691 case Reloc::DynamicNoPIC:
692 Opc = isThumb2 ? ARM::t2MOV_ga_dyn : ARM::MOV_ga_dyn;
695 Opc = isThumb2 ? ARM::t2MOVi32imm : ARM::MOVi32imm;
698 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
699 DestReg).addGlobalAddress(GV));
701 // MachineConstantPool wants an explicit alignment.
702 unsigned Align = TD.getPrefTypeAlignment(GV->getType());
704 // TODO: Figure out if this is correct.
705 Align = TD.getTypeAllocSize(GV->getType());
708 if (Subtarget->isTargetELF() && RelocM == Reloc::PIC_)
709 return ARMLowerPICELF(GV, Align, VT);
712 unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 :
713 (Subtarget->isThumb() ? 4 : 8);
714 unsigned Id = AFI->createPICLabelUId();
715 ARMConstantPoolValue *CPV = ARMConstantPoolConstant::Create(GV, Id,
718 unsigned Idx = MCP.getConstantPoolIndex(CPV, Align);
721 MachineInstrBuilder MIB;
723 unsigned Opc = (RelocM!=Reloc::PIC_) ? ARM::t2LDRpci : ARM::t2LDRpci_pic;
724 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc), DestReg)
725 .addConstantPoolIndex(Idx);
726 if (RelocM == Reloc::PIC_)
728 AddOptionalDefs(MIB);
730 // The extra immediate is for addrmode2.
731 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(ARM::LDRcp),
733 .addConstantPoolIndex(Idx)
735 AddOptionalDefs(MIB);
737 if (RelocM == Reloc::PIC_) {
738 unsigned Opc = IsIndirect ? ARM::PICLDR : ARM::PICADD;
739 unsigned NewDestReg = createResultReg(TLI.getRegClassFor(VT));
741 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
742 DL, TII.get(Opc), NewDestReg)
745 AddOptionalDefs(MIB);
752 MachineInstrBuilder MIB;
753 unsigned NewDestReg = createResultReg(TLI.getRegClassFor(VT));
755 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
756 TII.get(ARM::t2LDRi12), NewDestReg)
760 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(ARM::LDRi12),
764 DestReg = NewDestReg;
765 AddOptionalDefs(MIB);
771 unsigned ARMFastISel::TargetMaterializeConstant(const Constant *C) {
772 EVT CEVT = TLI.getValueType(C->getType(), true);
774 // Only handle simple types.
775 if (!CEVT.isSimple()) return 0;
776 MVT VT = CEVT.getSimpleVT();
778 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C))
779 return ARMMaterializeFP(CFP, VT);
780 else if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
781 return ARMMaterializeGV(GV, VT);
782 else if (isa<ConstantInt>(C))
783 return ARMMaterializeInt(C, VT);
788 // TODO: unsigned ARMFastISel::TargetMaterializeFloatZero(const ConstantFP *CF);
790 unsigned ARMFastISel::TargetMaterializeAlloca(const AllocaInst *AI) {
791 // Don't handle dynamic allocas.
792 if (!FuncInfo.StaticAllocaMap.count(AI)) return 0;
795 if (!isLoadTypeLegal(AI->getType(), VT)) return 0;
797 DenseMap<const AllocaInst*, int>::iterator SI =
798 FuncInfo.StaticAllocaMap.find(AI);
800 // This will get lowered later into the correct offsets and registers
801 // via rewriteXFrameIndex.
802 if (SI != FuncInfo.StaticAllocaMap.end()) {
803 const TargetRegisterClass* RC = TLI.getRegClassFor(VT);
804 unsigned ResultReg = createResultReg(RC);
805 unsigned Opc = isThumb2 ? ARM::t2ADDri : ARM::ADDri;
806 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
807 TII.get(Opc), ResultReg)
808 .addFrameIndex(SI->second)
816 bool ARMFastISel::isTypeLegal(Type *Ty, MVT &VT) {
817 EVT evt = TLI.getValueType(Ty, true);
819 // Only handle simple types.
820 if (evt == MVT::Other || !evt.isSimple()) return false;
821 VT = evt.getSimpleVT();
823 // Handle all legal types, i.e. a register that will directly hold this
825 return TLI.isTypeLegal(VT);
828 bool ARMFastISel::isLoadTypeLegal(Type *Ty, MVT &VT) {
829 if (isTypeLegal(Ty, VT)) return true;
831 // If this is a type than can be sign or zero-extended to a basic operation
832 // go ahead and accept it now.
833 if (VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16)
839 // Computes the address to get to an object.
840 bool ARMFastISel::ARMComputeAddress(const Value *Obj, Address &Addr) {
841 // Some boilerplate from the X86 FastISel.
842 const User *U = NULL;
843 unsigned Opcode = Instruction::UserOp1;
844 if (const Instruction *I = dyn_cast<Instruction>(Obj)) {
845 // Don't walk into other basic blocks unless the object is an alloca from
846 // another block, otherwise it may not have a virtual register assigned.
847 if (FuncInfo.StaticAllocaMap.count(static_cast<const AllocaInst *>(Obj)) ||
848 FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
849 Opcode = I->getOpcode();
852 } else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(Obj)) {
853 Opcode = C->getOpcode();
857 if (PointerType *Ty = dyn_cast<PointerType>(Obj->getType()))
858 if (Ty->getAddressSpace() > 255)
859 // Fast instruction selection doesn't support the special
866 case Instruction::BitCast:
867 // Look through bitcasts.
868 return ARMComputeAddress(U->getOperand(0), Addr);
869 case Instruction::IntToPtr:
870 // Look past no-op inttoptrs.
871 if (TLI.getValueType(U->getOperand(0)->getType()) == TLI.getPointerTy())
872 return ARMComputeAddress(U->getOperand(0), Addr);
874 case Instruction::PtrToInt:
875 // Look past no-op ptrtoints.
876 if (TLI.getValueType(U->getType()) == TLI.getPointerTy())
877 return ARMComputeAddress(U->getOperand(0), Addr);
879 case Instruction::GetElementPtr: {
880 Address SavedAddr = Addr;
881 int TmpOffset = Addr.Offset;
883 // Iterate through the GEP folding the constants into offsets where
885 gep_type_iterator GTI = gep_type_begin(U);
886 for (User::const_op_iterator i = U->op_begin() + 1, e = U->op_end();
887 i != e; ++i, ++GTI) {
888 const Value *Op = *i;
889 if (StructType *STy = dyn_cast<StructType>(*GTI)) {
890 const StructLayout *SL = TD.getStructLayout(STy);
891 unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
892 TmpOffset += SL->getElementOffset(Idx);
894 uint64_t S = TD.getTypeAllocSize(GTI.getIndexedType());
896 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
897 // Constant-offset addressing.
898 TmpOffset += CI->getSExtValue() * S;
901 if (isa<AddOperator>(Op) &&
902 (!isa<Instruction>(Op) ||
903 FuncInfo.MBBMap[cast<Instruction>(Op)->getParent()]
905 isa<ConstantInt>(cast<AddOperator>(Op)->getOperand(1))) {
906 // An add (in the same block) with a constant operand. Fold the
909 cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
910 TmpOffset += CI->getSExtValue() * S;
911 // Iterate on the other operand.
912 Op = cast<AddOperator>(Op)->getOperand(0);
916 goto unsupported_gep;
921 // Try to grab the base operand now.
922 Addr.Offset = TmpOffset;
923 if (ARMComputeAddress(U->getOperand(0), Addr)) return true;
925 // We failed, restore everything and try the other options.
931 case Instruction::Alloca: {
932 const AllocaInst *AI = cast<AllocaInst>(Obj);
933 DenseMap<const AllocaInst*, int>::iterator SI =
934 FuncInfo.StaticAllocaMap.find(AI);
935 if (SI != FuncInfo.StaticAllocaMap.end()) {
936 Addr.BaseType = Address::FrameIndexBase;
937 Addr.Base.FI = SI->second;
944 // Try to get this in a register if nothing else has worked.
945 if (Addr.Base.Reg == 0) Addr.Base.Reg = getRegForValue(Obj);
946 return Addr.Base.Reg != 0;
949 void ARMFastISel::ARMSimplifyAddress(Address &Addr, MVT VT, bool useAM3) {
950 bool needsLowering = false;
951 switch (VT.SimpleTy) {
952 default: llvm_unreachable("Unhandled load/store type!");
958 // Integer loads/stores handle 12-bit offsets.
959 needsLowering = ((Addr.Offset & 0xfff) != Addr.Offset);
960 // Handle negative offsets.
961 if (needsLowering && isThumb2)
962 needsLowering = !(Subtarget->hasV6T2Ops() && Addr.Offset < 0 &&
965 // ARM halfword load/stores and signed byte loads use +/-imm8 offsets.
966 needsLowering = (Addr.Offset > 255 || Addr.Offset < -255);
971 // Floating point operands handle 8-bit offsets.
972 needsLowering = ((Addr.Offset & 0xff) != Addr.Offset);
976 // If this is a stack pointer and the offset needs to be simplified then
977 // put the alloca address into a register, set the base type back to
978 // register and continue. This should almost never happen.
979 if (needsLowering && Addr.BaseType == Address::FrameIndexBase) {
980 const TargetRegisterClass *RC = isThumb2 ?
981 (const TargetRegisterClass*)&ARM::tGPRRegClass :
982 (const TargetRegisterClass*)&ARM::GPRRegClass;
983 unsigned ResultReg = createResultReg(RC);
984 unsigned Opc = isThumb2 ? ARM::t2ADDri : ARM::ADDri;
985 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
986 TII.get(Opc), ResultReg)
987 .addFrameIndex(Addr.Base.FI)
989 Addr.Base.Reg = ResultReg;
990 Addr.BaseType = Address::RegBase;
993 // Since the offset is too large for the load/store instruction
994 // get the reg+offset into a register.
996 Addr.Base.Reg = FastEmit_ri_(MVT::i32, ISD::ADD, Addr.Base.Reg,
997 /*Op0IsKill*/false, Addr.Offset, MVT::i32);
1002 void ARMFastISel::AddLoadStoreOperands(MVT VT, Address &Addr,
1003 const MachineInstrBuilder &MIB,
1004 unsigned Flags, bool useAM3) {
1005 // addrmode5 output depends on the selection dag addressing dividing the
1006 // offset by 4 that it then later multiplies. Do this here as well.
1007 if (VT.SimpleTy == MVT::f32 || VT.SimpleTy == MVT::f64)
1010 // Frame base works a bit differently. Handle it separately.
1011 if (Addr.BaseType == Address::FrameIndexBase) {
1012 int FI = Addr.Base.FI;
1013 int Offset = Addr.Offset;
1014 MachineMemOperand *MMO =
1015 FuncInfo.MF->getMachineMemOperand(
1016 MachinePointerInfo::getFixedStack(FI, Offset),
1018 MFI.getObjectSize(FI),
1019 MFI.getObjectAlignment(FI));
1020 // Now add the rest of the operands.
1021 MIB.addFrameIndex(FI);
1023 // ARM halfword load/stores and signed byte loads need an additional
1026 signed Imm = (Addr.Offset < 0) ? (0x100 | -Addr.Offset) : Addr.Offset;
1030 MIB.addImm(Addr.Offset);
1032 MIB.addMemOperand(MMO);
1034 // Now add the rest of the operands.
1035 MIB.addReg(Addr.Base.Reg);
1037 // ARM halfword load/stores and signed byte loads need an additional
1040 signed Imm = (Addr.Offset < 0) ? (0x100 | -Addr.Offset) : Addr.Offset;
1044 MIB.addImm(Addr.Offset);
1047 AddOptionalDefs(MIB);
1050 bool ARMFastISel::ARMEmitLoad(MVT VT, unsigned &ResultReg, Address &Addr,
1051 unsigned Alignment, bool isZExt, bool allocReg) {
1053 bool useAM3 = false;
1054 bool needVMOV = false;
1055 const TargetRegisterClass *RC;
1056 switch (VT.SimpleTy) {
1057 // This is mostly going to be Neon/vector support.
1058 default: return false;
1062 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1063 Opc = isZExt ? ARM::t2LDRBi8 : ARM::t2LDRSBi8;
1065 Opc = isZExt ? ARM::t2LDRBi12 : ARM::t2LDRSBi12;
1074 RC = isThumb2 ? &ARM::rGPRRegClass : &ARM::GPRnopcRegClass;
1077 if (Alignment && Alignment < 2 && !Subtarget->allowsUnalignedMem())
1081 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1082 Opc = isZExt ? ARM::t2LDRHi8 : ARM::t2LDRSHi8;
1084 Opc = isZExt ? ARM::t2LDRHi12 : ARM::t2LDRSHi12;
1086 Opc = isZExt ? ARM::LDRH : ARM::LDRSH;
1089 RC = isThumb2 ? &ARM::rGPRRegClass : &ARM::GPRnopcRegClass;
1092 if (Alignment && Alignment < 4 && !Subtarget->allowsUnalignedMem())
1096 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1099 Opc = ARM::t2LDRi12;
1103 RC = isThumb2 ? &ARM::rGPRRegClass : &ARM::GPRnopcRegClass;
1106 if (!Subtarget->hasVFP2()) return false;
1107 // Unaligned loads need special handling. Floats require word-alignment.
1108 if (Alignment && Alignment < 4) {
1111 Opc = isThumb2 ? ARM::t2LDRi12 : ARM::LDRi12;
1112 RC = isThumb2 ? &ARM::rGPRRegClass : &ARM::GPRnopcRegClass;
1115 RC = TLI.getRegClassFor(VT);
1119 if (!Subtarget->hasVFP2()) return false;
1120 // FIXME: Unaligned loads need special handling. Doublewords require
1122 if (Alignment && Alignment < 4)
1126 RC = TLI.getRegClassFor(VT);
1129 // Simplify this down to something we can handle.
1130 ARMSimplifyAddress(Addr, VT, useAM3);
1132 // Create the base instruction, then add the operands.
1134 ResultReg = createResultReg(RC);
1135 assert (ResultReg > 255 && "Expected an allocated virtual register.");
1136 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1137 TII.get(Opc), ResultReg);
1138 AddLoadStoreOperands(VT, Addr, MIB, MachineMemOperand::MOLoad, useAM3);
1140 // If we had an unaligned load of a float we've converted it to an regular
1141 // load. Now we must move from the GRP to the FP register.
1143 unsigned MoveReg = createResultReg(TLI.getRegClassFor(MVT::f32));
1144 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1145 TII.get(ARM::VMOVSR), MoveReg)
1146 .addReg(ResultReg));
1147 ResultReg = MoveReg;
1152 bool ARMFastISel::SelectLoad(const Instruction *I) {
1153 // Atomic loads need special handling.
1154 if (cast<LoadInst>(I)->isAtomic())
1157 // Verify we have a legal type before going any further.
1159 if (!isLoadTypeLegal(I->getType(), VT))
1162 // See if we can handle this address.
1164 if (!ARMComputeAddress(I->getOperand(0), Addr)) return false;
1167 if (!ARMEmitLoad(VT, ResultReg, Addr, cast<LoadInst>(I)->getAlignment()))
1169 UpdateValueMap(I, ResultReg);
1173 bool ARMFastISel::ARMEmitStore(MVT VT, unsigned SrcReg, Address &Addr,
1174 unsigned Alignment) {
1176 bool useAM3 = false;
1177 switch (VT.SimpleTy) {
1178 // This is mostly going to be Neon/vector support.
1179 default: return false;
1181 unsigned Res = createResultReg(isThumb2 ?
1182 (const TargetRegisterClass*)&ARM::tGPRRegClass :
1183 (const TargetRegisterClass*)&ARM::GPRRegClass);
1184 unsigned Opc = isThumb2 ? ARM::t2ANDri : ARM::ANDri;
1185 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1187 .addReg(SrcReg).addImm(1));
1189 } // Fallthrough here.
1192 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1193 StrOpc = ARM::t2STRBi8;
1195 StrOpc = ARM::t2STRBi12;
1197 StrOpc = ARM::STRBi12;
1201 if (Alignment && Alignment < 2 && !Subtarget->allowsUnalignedMem())
1205 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1206 StrOpc = ARM::t2STRHi8;
1208 StrOpc = ARM::t2STRHi12;
1215 if (Alignment && Alignment < 4 && !Subtarget->allowsUnalignedMem())
1219 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1220 StrOpc = ARM::t2STRi8;
1222 StrOpc = ARM::t2STRi12;
1224 StrOpc = ARM::STRi12;
1228 if (!Subtarget->hasVFP2()) return false;
1229 // Unaligned stores need special handling. Floats require word-alignment.
1230 if (Alignment && Alignment < 4) {
1231 unsigned MoveReg = createResultReg(TLI.getRegClassFor(MVT::i32));
1232 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1233 TII.get(ARM::VMOVRS), MoveReg)
1237 StrOpc = isThumb2 ? ARM::t2STRi12 : ARM::STRi12;
1239 StrOpc = ARM::VSTRS;
1243 if (!Subtarget->hasVFP2()) return false;
1244 // FIXME: Unaligned stores need special handling. Doublewords require
1246 if (Alignment && Alignment < 4)
1249 StrOpc = ARM::VSTRD;
1252 // Simplify this down to something we can handle.
1253 ARMSimplifyAddress(Addr, VT, useAM3);
1255 // Create the base instruction, then add the operands.
1256 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1259 AddLoadStoreOperands(VT, Addr, MIB, MachineMemOperand::MOStore, useAM3);
1263 bool ARMFastISel::SelectStore(const Instruction *I) {
1264 Value *Op0 = I->getOperand(0);
1265 unsigned SrcReg = 0;
1267 // Atomic stores need special handling.
1268 if (cast<StoreInst>(I)->isAtomic())
1271 // Verify we have a legal type before going any further.
1273 if (!isLoadTypeLegal(I->getOperand(0)->getType(), VT))
1276 // Get the value to be stored into a register.
1277 SrcReg = getRegForValue(Op0);
1278 if (SrcReg == 0) return false;
1280 // See if we can handle this address.
1282 if (!ARMComputeAddress(I->getOperand(1), Addr))
1285 if (!ARMEmitStore(VT, SrcReg, Addr, cast<StoreInst>(I)->getAlignment()))
1290 static ARMCC::CondCodes getComparePred(CmpInst::Predicate Pred) {
1292 // Needs two compares...
1293 case CmpInst::FCMP_ONE:
1294 case CmpInst::FCMP_UEQ:
1296 // AL is our "false" for now. The other two need more compares.
1298 case CmpInst::ICMP_EQ:
1299 case CmpInst::FCMP_OEQ:
1301 case CmpInst::ICMP_SGT:
1302 case CmpInst::FCMP_OGT:
1304 case CmpInst::ICMP_SGE:
1305 case CmpInst::FCMP_OGE:
1307 case CmpInst::ICMP_UGT:
1308 case CmpInst::FCMP_UGT:
1310 case CmpInst::FCMP_OLT:
1312 case CmpInst::ICMP_ULE:
1313 case CmpInst::FCMP_OLE:
1315 case CmpInst::FCMP_ORD:
1317 case CmpInst::FCMP_UNO:
1319 case CmpInst::FCMP_UGE:
1321 case CmpInst::ICMP_SLT:
1322 case CmpInst::FCMP_ULT:
1324 case CmpInst::ICMP_SLE:
1325 case CmpInst::FCMP_ULE:
1327 case CmpInst::FCMP_UNE:
1328 case CmpInst::ICMP_NE:
1330 case CmpInst::ICMP_UGE:
1332 case CmpInst::ICMP_ULT:
1337 bool ARMFastISel::SelectBranch(const Instruction *I) {
1338 const BranchInst *BI = cast<BranchInst>(I);
1339 MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
1340 MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
1342 // Simple branch support.
1344 // If we can, avoid recomputing the compare - redoing it could lead to wonky
1346 if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
1347 if (CI->hasOneUse() && (CI->getParent() == I->getParent())) {
1349 // Get the compare predicate.
1350 // Try to take advantage of fallthrough opportunities.
1351 CmpInst::Predicate Predicate = CI->getPredicate();
1352 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
1353 std::swap(TBB, FBB);
1354 Predicate = CmpInst::getInversePredicate(Predicate);
1357 ARMCC::CondCodes ARMPred = getComparePred(Predicate);
1359 // We may not handle every CC for now.
1360 if (ARMPred == ARMCC::AL) return false;
1362 // Emit the compare.
1363 if (!ARMEmitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
1366 unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
1367 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
1368 .addMBB(TBB).addImm(ARMPred).addReg(ARM::CPSR);
1369 FastEmitBranch(FBB, DL);
1370 FuncInfo.MBB->addSuccessor(TBB);
1373 } else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) {
1375 if (TI->hasOneUse() && TI->getParent() == I->getParent() &&
1376 (isLoadTypeLegal(TI->getOperand(0)->getType(), SourceVT))) {
1377 unsigned TstOpc = isThumb2 ? ARM::t2TSTri : ARM::TSTri;
1378 unsigned OpReg = getRegForValue(TI->getOperand(0));
1379 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1381 .addReg(OpReg).addImm(1));
1383 unsigned CCMode = ARMCC::NE;
1384 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
1385 std::swap(TBB, FBB);
1389 unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
1390 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
1391 .addMBB(TBB).addImm(CCMode).addReg(ARM::CPSR);
1393 FastEmitBranch(FBB, DL);
1394 FuncInfo.MBB->addSuccessor(TBB);
1397 } else if (const ConstantInt *CI =
1398 dyn_cast<ConstantInt>(BI->getCondition())) {
1399 uint64_t Imm = CI->getZExtValue();
1400 MachineBasicBlock *Target = (Imm == 0) ? FBB : TBB;
1401 FastEmitBranch(Target, DL);
1405 unsigned CmpReg = getRegForValue(BI->getCondition());
1406 if (CmpReg == 0) return false;
1408 // We've been divorced from our compare! Our block was split, and
1409 // now our compare lives in a predecessor block. We musn't
1410 // re-compare here, as the children of the compare aren't guaranteed
1411 // live across the block boundary (we *could* check for this).
1412 // Regardless, the compare has been done in the predecessor block,
1413 // and it left a value for us in a virtual register. Ergo, we test
1414 // the one-bit value left in the virtual register.
1415 unsigned TstOpc = isThumb2 ? ARM::t2TSTri : ARM::TSTri;
1416 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TstOpc))
1417 .addReg(CmpReg).addImm(1));
1419 unsigned CCMode = ARMCC::NE;
1420 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
1421 std::swap(TBB, FBB);
1425 unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
1426 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
1427 .addMBB(TBB).addImm(CCMode).addReg(ARM::CPSR);
1428 FastEmitBranch(FBB, DL);
1429 FuncInfo.MBB->addSuccessor(TBB);
1433 bool ARMFastISel::SelectIndirectBr(const Instruction *I) {
1434 unsigned AddrReg = getRegForValue(I->getOperand(0));
1435 if (AddrReg == 0) return false;
1437 unsigned Opc = isThumb2 ? ARM::tBRIND : ARM::BX;
1438 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc))
1441 const IndirectBrInst *IB = cast<IndirectBrInst>(I);
1442 for (unsigned i = 0, e = IB->getNumSuccessors(); i != e; ++i)
1443 FuncInfo.MBB->addSuccessor(FuncInfo.MBBMap[IB->getSuccessor(i)]);
1448 bool ARMFastISel::ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
1450 Type *Ty = Src1Value->getType();
1451 EVT SrcEVT = TLI.getValueType(Ty, true);
1452 if (!SrcEVT.isSimple()) return false;
1453 MVT SrcVT = SrcEVT.getSimpleVT();
1455 bool isFloat = (Ty->isFloatTy() || Ty->isDoubleTy());
1456 if (isFloat && !Subtarget->hasVFP2())
1459 // Check to see if the 2nd operand is a constant that we can encode directly
1462 bool UseImm = false;
1463 bool isNegativeImm = false;
1464 // FIXME: At -O0 we don't have anything that canonicalizes operand order.
1465 // Thus, Src1Value may be a ConstantInt, but we're missing it.
1466 if (const ConstantInt *ConstInt = dyn_cast<ConstantInt>(Src2Value)) {
1467 if (SrcVT == MVT::i32 || SrcVT == MVT::i16 || SrcVT == MVT::i8 ||
1469 const APInt &CIVal = ConstInt->getValue();
1470 Imm = (isZExt) ? (int)CIVal.getZExtValue() : (int)CIVal.getSExtValue();
1471 // For INT_MIN/LONG_MIN (i.e., 0x80000000) we need to use a cmp, rather
1472 // then a cmn, because there is no way to represent 2147483648 as a
1473 // signed 32-bit int.
1474 if (Imm < 0 && Imm != (int)0x80000000) {
1475 isNegativeImm = true;
1478 UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
1479 (ARM_AM::getSOImmVal(Imm) != -1);
1481 } else if (const ConstantFP *ConstFP = dyn_cast<ConstantFP>(Src2Value)) {
1482 if (SrcVT == MVT::f32 || SrcVT == MVT::f64)
1483 if (ConstFP->isZero() && !ConstFP->isNegative())
1489 bool needsExt = false;
1490 switch (SrcVT.SimpleTy) {
1491 default: return false;
1492 // TODO: Verify compares.
1495 CmpOpc = UseImm ? ARM::VCMPEZS : ARM::VCMPES;
1499 CmpOpc = UseImm ? ARM::VCMPEZD : ARM::VCMPED;
1505 // Intentional fall-through.
1509 CmpOpc = ARM::t2CMPrr;
1511 CmpOpc = isNegativeImm ? ARM::t2CMNri : ARM::t2CMPri;
1514 CmpOpc = ARM::CMPrr;
1516 CmpOpc = isNegativeImm ? ARM::CMNri : ARM::CMPri;
1521 unsigned SrcReg1 = getRegForValue(Src1Value);
1522 if (SrcReg1 == 0) return false;
1524 unsigned SrcReg2 = 0;
1526 SrcReg2 = getRegForValue(Src2Value);
1527 if (SrcReg2 == 0) return false;
1530 // We have i1, i8, or i16, we need to either zero extend or sign extend.
1532 SrcReg1 = ARMEmitIntExt(SrcVT, SrcReg1, MVT::i32, isZExt);
1533 if (SrcReg1 == 0) return false;
1535 SrcReg2 = ARMEmitIntExt(SrcVT, SrcReg2, MVT::i32, isZExt);
1536 if (SrcReg2 == 0) return false;
1541 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1543 .addReg(SrcReg1).addReg(SrcReg2));
1545 MachineInstrBuilder MIB;
1546 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
1549 // Only add immediate for icmp as the immediate for fcmp is an implicit 0.0.
1552 AddOptionalDefs(MIB);
1555 // For floating point we need to move the result to a comparison register
1556 // that we can then use for branches.
1557 if (Ty->isFloatTy() || Ty->isDoubleTy())
1558 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1559 TII.get(ARM::FMSTAT)));
1563 bool ARMFastISel::SelectCmp(const Instruction *I) {
1564 const CmpInst *CI = cast<CmpInst>(I);
1566 // Get the compare predicate.
1567 ARMCC::CondCodes ARMPred = getComparePred(CI->getPredicate());
1569 // We may not handle every CC for now.
1570 if (ARMPred == ARMCC::AL) return false;
1572 // Emit the compare.
1573 if (!ARMEmitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
1576 // Now set a register based on the comparison. Explicitly set the predicates
1578 unsigned MovCCOpc = isThumb2 ? ARM::t2MOVCCi : ARM::MOVCCi;
1579 const TargetRegisterClass *RC = isThumb2 ?
1580 (const TargetRegisterClass*)&ARM::rGPRRegClass :
1581 (const TargetRegisterClass*)&ARM::GPRRegClass;
1582 unsigned DestReg = createResultReg(RC);
1583 Constant *Zero = ConstantInt::get(Type::getInt32Ty(*Context), 0);
1584 unsigned ZeroReg = TargetMaterializeConstant(Zero);
1585 // ARMEmitCmp emits a FMSTAT when necessary, so it's always safe to use CPSR.
1586 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), DestReg)
1587 .addReg(ZeroReg).addImm(1)
1588 .addImm(ARMPred).addReg(ARM::CPSR);
1590 UpdateValueMap(I, DestReg);
1594 bool ARMFastISel::SelectFPExt(const Instruction *I) {
1595 // Make sure we have VFP and that we're extending float to double.
1596 if (!Subtarget->hasVFP2()) return false;
1598 Value *V = I->getOperand(0);
1599 if (!I->getType()->isDoubleTy() ||
1600 !V->getType()->isFloatTy()) return false;
1602 unsigned Op = getRegForValue(V);
1603 if (Op == 0) return false;
1605 unsigned Result = createResultReg(&ARM::DPRRegClass);
1606 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1607 TII.get(ARM::VCVTDS), Result)
1609 UpdateValueMap(I, Result);
1613 bool ARMFastISel::SelectFPTrunc(const Instruction *I) {
1614 // Make sure we have VFP and that we're truncating double to float.
1615 if (!Subtarget->hasVFP2()) return false;
1617 Value *V = I->getOperand(0);
1618 if (!(I->getType()->isFloatTy() &&
1619 V->getType()->isDoubleTy())) return false;
1621 unsigned Op = getRegForValue(V);
1622 if (Op == 0) return false;
1624 unsigned Result = createResultReg(&ARM::SPRRegClass);
1625 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1626 TII.get(ARM::VCVTSD), Result)
1628 UpdateValueMap(I, Result);
1632 bool ARMFastISel::SelectIToFP(const Instruction *I, bool isSigned) {
1633 // Make sure we have VFP.
1634 if (!Subtarget->hasVFP2()) return false;
1637 Type *Ty = I->getType();
1638 if (!isTypeLegal(Ty, DstVT))
1641 Value *Src = I->getOperand(0);
1642 EVT SrcEVT = TLI.getValueType(Src->getType(), true);
1643 if (!SrcEVT.isSimple())
1645 MVT SrcVT = SrcEVT.getSimpleVT();
1646 if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
1649 unsigned SrcReg = getRegForValue(Src);
1650 if (SrcReg == 0) return false;
1652 // Handle sign-extension.
1653 if (SrcVT == MVT::i16 || SrcVT == MVT::i8) {
1654 SrcReg = ARMEmitIntExt(SrcVT, SrcReg, MVT::i32,
1655 /*isZExt*/!isSigned);
1656 if (SrcReg == 0) return false;
1659 // The conversion routine works on fp-reg to fp-reg and the operand above
1660 // was an integer, move it to the fp registers if possible.
1661 unsigned FP = ARMMoveToFPReg(MVT::f32, SrcReg);
1662 if (FP == 0) return false;
1665 if (Ty->isFloatTy()) Opc = isSigned ? ARM::VSITOS : ARM::VUITOS;
1666 else if (Ty->isDoubleTy()) Opc = isSigned ? ARM::VSITOD : ARM::VUITOD;
1669 unsigned ResultReg = createResultReg(TLI.getRegClassFor(DstVT));
1670 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
1673 UpdateValueMap(I, ResultReg);
1677 bool ARMFastISel::SelectFPToI(const Instruction *I, bool isSigned) {
1678 // Make sure we have VFP.
1679 if (!Subtarget->hasVFP2()) return false;
1682 Type *RetTy = I->getType();
1683 if (!isTypeLegal(RetTy, DstVT))
1686 unsigned Op = getRegForValue(I->getOperand(0));
1687 if (Op == 0) return false;
1690 Type *OpTy = I->getOperand(0)->getType();
1691 if (OpTy->isFloatTy()) Opc = isSigned ? ARM::VTOSIZS : ARM::VTOUIZS;
1692 else if (OpTy->isDoubleTy()) Opc = isSigned ? ARM::VTOSIZD : ARM::VTOUIZD;
1695 // f64->s32/u32 or f32->s32/u32 both need an intermediate f32 reg.
1696 unsigned ResultReg = createResultReg(TLI.getRegClassFor(MVT::f32));
1697 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
1701 // This result needs to be in an integer register, but the conversion only
1702 // takes place in fp-regs.
1703 unsigned IntReg = ARMMoveToIntReg(DstVT, ResultReg);
1704 if (IntReg == 0) return false;
1706 UpdateValueMap(I, IntReg);
1710 bool ARMFastISel::SelectSelect(const Instruction *I) {
1712 if (!isTypeLegal(I->getType(), VT))
1715 // Things need to be register sized for register moves.
1716 if (VT != MVT::i32) return false;
1718 unsigned CondReg = getRegForValue(I->getOperand(0));
1719 if (CondReg == 0) return false;
1720 unsigned Op1Reg = getRegForValue(I->getOperand(1));
1721 if (Op1Reg == 0) return false;
1723 // Check to see if we can use an immediate in the conditional move.
1725 bool UseImm = false;
1726 bool isNegativeImm = false;
1727 if (const ConstantInt *ConstInt = dyn_cast<ConstantInt>(I->getOperand(2))) {
1728 assert (VT == MVT::i32 && "Expecting an i32.");
1729 Imm = (int)ConstInt->getValue().getZExtValue();
1731 isNegativeImm = true;
1734 UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
1735 (ARM_AM::getSOImmVal(Imm) != -1);
1738 unsigned Op2Reg = 0;
1740 Op2Reg = getRegForValue(I->getOperand(2));
1741 if (Op2Reg == 0) return false;
1744 unsigned CmpOpc = isThumb2 ? ARM::t2CMPri : ARM::CMPri;
1745 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
1746 .addReg(CondReg).addImm(0));
1749 const TargetRegisterClass *RC;
1751 RC = isThumb2 ? &ARM::tGPRRegClass : &ARM::GPRRegClass;
1752 MovCCOpc = isThumb2 ? ARM::t2MOVCCr : ARM::MOVCCr;
1754 RC = isThumb2 ? &ARM::rGPRRegClass : &ARM::GPRRegClass;
1756 MovCCOpc = isThumb2 ? ARM::t2MOVCCi : ARM::MOVCCi;
1758 MovCCOpc = isThumb2 ? ARM::t2MVNCCi : ARM::MVNCCi;
1760 unsigned ResultReg = createResultReg(RC);
1762 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), ResultReg)
1763 .addReg(Op2Reg).addReg(Op1Reg).addImm(ARMCC::NE).addReg(ARM::CPSR);
1765 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), ResultReg)
1766 .addReg(Op1Reg).addImm(Imm).addImm(ARMCC::EQ).addReg(ARM::CPSR);
1767 UpdateValueMap(I, ResultReg);
1771 bool ARMFastISel::SelectDiv(const Instruction *I, bool isSigned) {
1773 Type *Ty = I->getType();
1774 if (!isTypeLegal(Ty, VT))
1777 // If we have integer div support we should have selected this automagically.
1778 // In case we have a real miss go ahead and return false and we'll pick
1780 if (Subtarget->hasDivide()) return false;
1782 // Otherwise emit a libcall.
1783 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1785 LC = isSigned ? RTLIB::SDIV_I8 : RTLIB::UDIV_I8;
1786 else if (VT == MVT::i16)
1787 LC = isSigned ? RTLIB::SDIV_I16 : RTLIB::UDIV_I16;
1788 else if (VT == MVT::i32)
1789 LC = isSigned ? RTLIB::SDIV_I32 : RTLIB::UDIV_I32;
1790 else if (VT == MVT::i64)
1791 LC = isSigned ? RTLIB::SDIV_I64 : RTLIB::UDIV_I64;
1792 else if (VT == MVT::i128)
1793 LC = isSigned ? RTLIB::SDIV_I128 : RTLIB::UDIV_I128;
1794 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SDIV!");
1796 return ARMEmitLibcall(I, LC);
1799 bool ARMFastISel::SelectRem(const Instruction *I, bool isSigned) {
1801 Type *Ty = I->getType();
1802 if (!isTypeLegal(Ty, VT))
1805 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1807 LC = isSigned ? RTLIB::SREM_I8 : RTLIB::UREM_I8;
1808 else if (VT == MVT::i16)
1809 LC = isSigned ? RTLIB::SREM_I16 : RTLIB::UREM_I16;
1810 else if (VT == MVT::i32)
1811 LC = isSigned ? RTLIB::SREM_I32 : RTLIB::UREM_I32;
1812 else if (VT == MVT::i64)
1813 LC = isSigned ? RTLIB::SREM_I64 : RTLIB::UREM_I64;
1814 else if (VT == MVT::i128)
1815 LC = isSigned ? RTLIB::SREM_I128 : RTLIB::UREM_I128;
1816 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SREM!");
1818 return ARMEmitLibcall(I, LC);
1821 bool ARMFastISel::SelectBinaryIntOp(const Instruction *I, unsigned ISDOpcode) {
1822 EVT DestVT = TLI.getValueType(I->getType(), true);
1824 // We can get here in the case when we have a binary operation on a non-legal
1825 // type and the target independent selector doesn't know how to handle it.
1826 if (DestVT != MVT::i16 && DestVT != MVT::i8 && DestVT != MVT::i1)
1830 switch (ISDOpcode) {
1831 default: return false;
1833 Opc = isThumb2 ? ARM::t2ADDrr : ARM::ADDrr;
1836 Opc = isThumb2 ? ARM::t2ORRrr : ARM::ORRrr;
1839 Opc = isThumb2 ? ARM::t2SUBrr : ARM::SUBrr;
1843 unsigned SrcReg1 = getRegForValue(I->getOperand(0));
1844 if (SrcReg1 == 0) return false;
1846 // TODO: Often the 2nd operand is an immediate, which can be encoded directly
1847 // in the instruction, rather then materializing the value in a register.
1848 unsigned SrcReg2 = getRegForValue(I->getOperand(1));
1849 if (SrcReg2 == 0) return false;
1851 unsigned ResultReg = createResultReg(&ARM::GPRnopcRegClass);
1852 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1853 TII.get(Opc), ResultReg)
1854 .addReg(SrcReg1).addReg(SrcReg2));
1855 UpdateValueMap(I, ResultReg);
1859 bool ARMFastISel::SelectBinaryFPOp(const Instruction *I, unsigned ISDOpcode) {
1860 EVT FPVT = TLI.getValueType(I->getType(), true);
1861 if (!FPVT.isSimple()) return false;
1862 MVT VT = FPVT.getSimpleVT();
1864 // We can get here in the case when we want to use NEON for our fp
1865 // operations, but can't figure out how to. Just use the vfp instructions
1867 // FIXME: It'd be nice to use NEON instructions.
1868 Type *Ty = I->getType();
1869 bool isFloat = (Ty->isDoubleTy() || Ty->isFloatTy());
1870 if (isFloat && !Subtarget->hasVFP2())
1874 bool is64bit = VT == MVT::f64 || VT == MVT::i64;
1875 switch (ISDOpcode) {
1876 default: return false;
1878 Opc = is64bit ? ARM::VADDD : ARM::VADDS;
1881 Opc = is64bit ? ARM::VSUBD : ARM::VSUBS;
1884 Opc = is64bit ? ARM::VMULD : ARM::VMULS;
1887 unsigned Op1 = getRegForValue(I->getOperand(0));
1888 if (Op1 == 0) return false;
1890 unsigned Op2 = getRegForValue(I->getOperand(1));
1891 if (Op2 == 0) return false;
1893 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT.SimpleTy));
1894 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1895 TII.get(Opc), ResultReg)
1896 .addReg(Op1).addReg(Op2));
1897 UpdateValueMap(I, ResultReg);
1901 // Call Handling Code
1903 // This is largely taken directly from CCAssignFnForNode
1904 // TODO: We may not support all of this.
1905 CCAssignFn *ARMFastISel::CCAssignFnForCall(CallingConv::ID CC,
1910 llvm_unreachable("Unsupported calling convention");
1911 case CallingConv::Fast:
1912 if (Subtarget->hasVFP2() && !isVarArg) {
1913 if (!Subtarget->isAAPCS_ABI())
1914 return (Return ? RetFastCC_ARM_APCS : FastCC_ARM_APCS);
1915 // For AAPCS ABI targets, just use VFP variant of the calling convention.
1916 return (Return ? RetCC_ARM_AAPCS_VFP : CC_ARM_AAPCS_VFP);
1919 case CallingConv::C:
1920 // Use target triple & subtarget features to do actual dispatch.
1921 if (Subtarget->isAAPCS_ABI()) {
1922 if (Subtarget->hasVFP2() &&
1923 TM.Options.FloatABIType == FloatABI::Hard && !isVarArg)
1924 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
1926 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
1928 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
1929 case CallingConv::ARM_AAPCS_VFP:
1931 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
1932 // Fall through to soft float variant, variadic functions don't
1933 // use hard floating point ABI.
1934 case CallingConv::ARM_AAPCS:
1935 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
1936 case CallingConv::ARM_APCS:
1937 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
1938 case CallingConv::GHC:
1940 llvm_unreachable("Can't return in GHC call convention");
1942 return CC_ARM_APCS_GHC;
1946 bool ARMFastISel::ProcessCallArgs(SmallVectorImpl<Value*> &Args,
1947 SmallVectorImpl<unsigned> &ArgRegs,
1948 SmallVectorImpl<MVT> &ArgVTs,
1949 SmallVectorImpl<ISD::ArgFlagsTy> &ArgFlags,
1950 SmallVectorImpl<unsigned> &RegArgs,
1954 SmallVector<CCValAssign, 16> ArgLocs;
1955 CCState CCInfo(CC, isVarArg, *FuncInfo.MF, TM, ArgLocs, *Context);
1956 CCInfo.AnalyzeCallOperands(ArgVTs, ArgFlags,
1957 CCAssignFnForCall(CC, false, isVarArg));
1959 // Check that we can handle all of the arguments. If we can't, then bail out
1960 // now before we add code to the MBB.
1961 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1962 CCValAssign &VA = ArgLocs[i];
1963 MVT ArgVT = ArgVTs[VA.getValNo()];
1965 // We don't handle NEON/vector parameters yet.
1966 if (ArgVT.isVector() || ArgVT.getSizeInBits() > 64)
1969 // Now copy/store arg to correct locations.
1970 if (VA.isRegLoc() && !VA.needsCustom()) {
1972 } else if (VA.needsCustom()) {
1973 // TODO: We need custom lowering for vector (v2f64) args.
1974 if (VA.getLocVT() != MVT::f64 ||
1975 // TODO: Only handle register args for now.
1976 !VA.isRegLoc() || !ArgLocs[++i].isRegLoc())
1979 switch (ArgVT.SimpleTy) {
1988 if (!Subtarget->hasVFP2())
1992 if (!Subtarget->hasVFP2())
1999 // At the point, we are able to handle the call's arguments in fast isel.
2001 // Get a count of how many bytes are to be pushed on the stack.
2002 NumBytes = CCInfo.getNextStackOffset();
2004 // Issue CALLSEQ_START
2005 unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
2006 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2007 TII.get(AdjStackDown))
2010 // Process the args.
2011 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
2012 CCValAssign &VA = ArgLocs[i];
2013 unsigned Arg = ArgRegs[VA.getValNo()];
2014 MVT ArgVT = ArgVTs[VA.getValNo()];
2016 assert((!ArgVT.isVector() && ArgVT.getSizeInBits() <= 64) &&
2017 "We don't handle NEON/vector parameters yet.");
2019 // Handle arg promotion, etc.
2020 switch (VA.getLocInfo()) {
2021 case CCValAssign::Full: break;
2022 case CCValAssign::SExt: {
2023 MVT DestVT = VA.getLocVT();
2024 Arg = ARMEmitIntExt(ArgVT, Arg, DestVT, /*isZExt*/false);
2025 assert (Arg != 0 && "Failed to emit a sext");
2029 case CCValAssign::AExt:
2030 // Intentional fall-through. Handle AExt and ZExt.
2031 case CCValAssign::ZExt: {
2032 MVT DestVT = VA.getLocVT();
2033 Arg = ARMEmitIntExt(ArgVT, Arg, DestVT, /*isZExt*/true);
2034 assert (Arg != 0 && "Failed to emit a zext");
2038 case CCValAssign::BCvt: {
2039 unsigned BC = FastEmit_r(ArgVT, VA.getLocVT(), ISD::BITCAST, Arg,
2040 /*TODO: Kill=*/false);
2041 assert(BC != 0 && "Failed to emit a bitcast!");
2043 ArgVT = VA.getLocVT();
2046 default: llvm_unreachable("Unknown arg promotion!");
2049 // Now copy/store arg to correct locations.
2050 if (VA.isRegLoc() && !VA.needsCustom()) {
2051 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
2054 RegArgs.push_back(VA.getLocReg());
2055 } else if (VA.needsCustom()) {
2056 // TODO: We need custom lowering for vector (v2f64) args.
2057 assert(VA.getLocVT() == MVT::f64 &&
2058 "Custom lowering for v2f64 args not available");
2060 CCValAssign &NextVA = ArgLocs[++i];
2062 assert(VA.isRegLoc() && NextVA.isRegLoc() &&
2063 "We only handle register args!");
2065 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2066 TII.get(ARM::VMOVRRD), VA.getLocReg())
2067 .addReg(NextVA.getLocReg(), RegState::Define)
2069 RegArgs.push_back(VA.getLocReg());
2070 RegArgs.push_back(NextVA.getLocReg());
2072 assert(VA.isMemLoc());
2073 // Need to store on the stack.
2075 Addr.BaseType = Address::RegBase;
2076 Addr.Base.Reg = ARM::SP;
2077 Addr.Offset = VA.getLocMemOffset();
2079 bool EmitRet = ARMEmitStore(ArgVT, Arg, Addr); (void)EmitRet;
2080 assert(EmitRet && "Could not emit a store for argument!");
2087 bool ARMFastISel::FinishCall(MVT RetVT, SmallVectorImpl<unsigned> &UsedRegs,
2088 const Instruction *I, CallingConv::ID CC,
2089 unsigned &NumBytes, bool isVarArg) {
2090 // Issue CALLSEQ_END
2091 unsigned AdjStackUp = TII.getCallFrameDestroyOpcode();
2092 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2093 TII.get(AdjStackUp))
2094 .addImm(NumBytes).addImm(0));
2096 // Now the return value.
2097 if (RetVT != MVT::isVoid) {
2098 SmallVector<CCValAssign, 16> RVLocs;
2099 CCState CCInfo(CC, isVarArg, *FuncInfo.MF, TM, RVLocs, *Context);
2100 CCInfo.AnalyzeCallResult(RetVT, CCAssignFnForCall(CC, true, isVarArg));
2102 // Copy all of the result registers out of their specified physreg.
2103 if (RVLocs.size() == 2 && RetVT == MVT::f64) {
2104 // For this move we copy into two registers and then move into the
2105 // double fp reg we want.
2106 MVT DestVT = RVLocs[0].getValVT();
2107 const TargetRegisterClass* DstRC = TLI.getRegClassFor(DestVT);
2108 unsigned ResultReg = createResultReg(DstRC);
2109 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2110 TII.get(ARM::VMOVDRR), ResultReg)
2111 .addReg(RVLocs[0].getLocReg())
2112 .addReg(RVLocs[1].getLocReg()));
2114 UsedRegs.push_back(RVLocs[0].getLocReg());
2115 UsedRegs.push_back(RVLocs[1].getLocReg());
2117 // Finally update the result.
2118 UpdateValueMap(I, ResultReg);
2120 assert(RVLocs.size() == 1 &&"Can't handle non-double multi-reg retvals!");
2121 MVT CopyVT = RVLocs[0].getValVT();
2123 // Special handling for extended integers.
2124 if (RetVT == MVT::i1 || RetVT == MVT::i8 || RetVT == MVT::i16)
2127 const TargetRegisterClass* DstRC = TLI.getRegClassFor(CopyVT);
2129 unsigned ResultReg = createResultReg(DstRC);
2130 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
2131 ResultReg).addReg(RVLocs[0].getLocReg());
2132 UsedRegs.push_back(RVLocs[0].getLocReg());
2134 // Finally update the result.
2135 UpdateValueMap(I, ResultReg);
2142 bool ARMFastISel::SelectRet(const Instruction *I) {
2143 const ReturnInst *Ret = cast<ReturnInst>(I);
2144 const Function &F = *I->getParent()->getParent();
2146 if (!FuncInfo.CanLowerReturn)
2149 // Build a list of return value registers.
2150 SmallVector<unsigned, 4> RetRegs;
2152 CallingConv::ID CC = F.getCallingConv();
2153 if (Ret->getNumOperands() > 0) {
2154 SmallVector<ISD::OutputArg, 4> Outs;
2155 GetReturnInfo(F.getReturnType(), F.getAttributes(), Outs, TLI);
2157 // Analyze operands of the call, assigning locations to each operand.
2158 SmallVector<CCValAssign, 16> ValLocs;
2159 CCState CCInfo(CC, F.isVarArg(), *FuncInfo.MF, TM, ValLocs,I->getContext());
2160 CCInfo.AnalyzeReturn(Outs, CCAssignFnForCall(CC, true /* is Ret */,
2163 const Value *RV = Ret->getOperand(0);
2164 unsigned Reg = getRegForValue(RV);
2168 // Only handle a single return value for now.
2169 if (ValLocs.size() != 1)
2172 CCValAssign &VA = ValLocs[0];
2174 // Don't bother handling odd stuff for now.
2175 if (VA.getLocInfo() != CCValAssign::Full)
2177 // Only handle register returns for now.
2181 unsigned SrcReg = Reg + VA.getValNo();
2182 EVT RVEVT = TLI.getValueType(RV->getType());
2183 if (!RVEVT.isSimple()) return false;
2184 MVT RVVT = RVEVT.getSimpleVT();
2185 MVT DestVT = VA.getValVT();
2186 // Special handling for extended integers.
2187 if (RVVT != DestVT) {
2188 if (RVVT != MVT::i1 && RVVT != MVT::i8 && RVVT != MVT::i16)
2191 assert(DestVT == MVT::i32 && "ARM should always ext to i32");
2193 // Perform extension if flagged as either zext or sext. Otherwise, do
2195 if (Outs[0].Flags.isZExt() || Outs[0].Flags.isSExt()) {
2196 SrcReg = ARMEmitIntExt(RVVT, SrcReg, DestVT, Outs[0].Flags.isZExt());
2197 if (SrcReg == 0) return false;
2202 unsigned DstReg = VA.getLocReg();
2203 const TargetRegisterClass* SrcRC = MRI.getRegClass(SrcReg);
2204 // Avoid a cross-class copy. This is very unlikely.
2205 if (!SrcRC->contains(DstReg))
2207 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
2208 DstReg).addReg(SrcReg);
2210 // Add register to return instruction.
2211 RetRegs.push_back(VA.getLocReg());
2214 unsigned RetOpc = isThumb2 ? ARM::tBX_RET : ARM::BX_RET;
2215 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2217 AddOptionalDefs(MIB);
2218 for (unsigned i = 0, e = RetRegs.size(); i != e; ++i)
2219 MIB.addReg(RetRegs[i], RegState::Implicit);
2223 unsigned ARMFastISel::ARMSelectCallOp(bool UseReg) {
2225 return isThumb2 ? ARM::tBLXr : ARM::BLX;
2227 return isThumb2 ? ARM::tBL : ARM::BL;
2230 unsigned ARMFastISel::getLibcallReg(const Twine &Name) {
2231 // Manually compute the global's type to avoid building it when unnecessary.
2232 Type *GVTy = Type::getInt32PtrTy(*Context, /*AS=*/0);
2233 EVT LCREVT = TLI.getValueType(GVTy);
2234 if (!LCREVT.isSimple()) return 0;
2236 GlobalValue *GV = new GlobalVariable(Type::getInt32Ty(*Context), false,
2237 GlobalValue::ExternalLinkage, 0, Name);
2238 assert(GV->getType() == GVTy && "We miscomputed the type for the global!");
2239 return ARMMaterializeGV(GV, LCREVT.getSimpleVT());
2242 // A quick function that will emit a call for a named libcall in F with the
2243 // vector of passed arguments for the Instruction in I. We can assume that we
2244 // can emit a call for any libcall we can produce. This is an abridged version
2245 // of the full call infrastructure since we won't need to worry about things
2246 // like computed function pointers or strange arguments at call sites.
2247 // TODO: Try to unify this and the normal call bits for ARM, then try to unify
2249 bool ARMFastISel::ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call) {
2250 CallingConv::ID CC = TLI.getLibcallCallingConv(Call);
2252 // Handle *simple* calls for now.
2253 Type *RetTy = I->getType();
2255 if (RetTy->isVoidTy())
2256 RetVT = MVT::isVoid;
2257 else if (!isTypeLegal(RetTy, RetVT))
2260 // Can't handle non-double multi-reg retvals.
2261 if (RetVT != MVT::isVoid && RetVT != MVT::i32) {
2262 SmallVector<CCValAssign, 16> RVLocs;
2263 CCState CCInfo(CC, false, *FuncInfo.MF, TM, RVLocs, *Context);
2264 CCInfo.AnalyzeCallResult(RetVT, CCAssignFnForCall(CC, true, false));
2265 if (RVLocs.size() >= 2 && RetVT != MVT::f64)
2269 // Set up the argument vectors.
2270 SmallVector<Value*, 8> Args;
2271 SmallVector<unsigned, 8> ArgRegs;
2272 SmallVector<MVT, 8> ArgVTs;
2273 SmallVector<ISD::ArgFlagsTy, 8> ArgFlags;
2274 Args.reserve(I->getNumOperands());
2275 ArgRegs.reserve(I->getNumOperands());
2276 ArgVTs.reserve(I->getNumOperands());
2277 ArgFlags.reserve(I->getNumOperands());
2278 for (unsigned i = 0; i < I->getNumOperands(); ++i) {
2279 Value *Op = I->getOperand(i);
2280 unsigned Arg = getRegForValue(Op);
2281 if (Arg == 0) return false;
2283 Type *ArgTy = Op->getType();
2285 if (!isTypeLegal(ArgTy, ArgVT)) return false;
2287 ISD::ArgFlagsTy Flags;
2288 unsigned OriginalAlignment = TD.getABITypeAlignment(ArgTy);
2289 Flags.setOrigAlign(OriginalAlignment);
2292 ArgRegs.push_back(Arg);
2293 ArgVTs.push_back(ArgVT);
2294 ArgFlags.push_back(Flags);
2297 // Handle the arguments now that we've gotten them.
2298 SmallVector<unsigned, 4> RegArgs;
2300 if (!ProcessCallArgs(Args, ArgRegs, ArgVTs, ArgFlags,
2301 RegArgs, CC, NumBytes, false))
2304 unsigned CalleeReg = 0;
2305 if (EnableARMLongCalls) {
2306 CalleeReg = getLibcallReg(TLI.getLibcallName(Call));
2307 if (CalleeReg == 0) return false;
2311 unsigned CallOpc = ARMSelectCallOp(EnableARMLongCalls);
2312 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
2313 DL, TII.get(CallOpc));
2314 // BL / BLX don't take a predicate, but tBL / tBLX do.
2316 AddDefaultPred(MIB);
2317 if (EnableARMLongCalls)
2318 MIB.addReg(CalleeReg);
2320 MIB.addExternalSymbol(TLI.getLibcallName(Call));
2322 // Add implicit physical register uses to the call.
2323 for (unsigned i = 0, e = RegArgs.size(); i != e; ++i)
2324 MIB.addReg(RegArgs[i], RegState::Implicit);
2326 // Add a register mask with the call-preserved registers.
2327 // Proper defs for return values will be added by setPhysRegsDeadExcept().
2328 MIB.addRegMask(TRI.getCallPreservedMask(CC));
2330 // Finish off the call including any return values.
2331 SmallVector<unsigned, 4> UsedRegs;
2332 if (!FinishCall(RetVT, UsedRegs, I, CC, NumBytes, false)) return false;
2334 // Set all unused physreg defs as dead.
2335 static_cast<MachineInstr *>(MIB)->setPhysRegsDeadExcept(UsedRegs, TRI);
2340 bool ARMFastISel::SelectCall(const Instruction *I,
2341 const char *IntrMemName = 0) {
2342 const CallInst *CI = cast<CallInst>(I);
2343 const Value *Callee = CI->getCalledValue();
2345 // Can't handle inline asm.
2346 if (isa<InlineAsm>(Callee)) return false;
2348 // Allow SelectionDAG isel to handle tail calls.
2349 if (CI->isTailCall()) return false;
2351 // Check the calling convention.
2352 ImmutableCallSite CS(CI);
2353 CallingConv::ID CC = CS.getCallingConv();
2355 // TODO: Avoid some calling conventions?
2357 PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
2358 FunctionType *FTy = cast<FunctionType>(PT->getElementType());
2359 bool isVarArg = FTy->isVarArg();
2361 // Handle *simple* calls for now.
2362 Type *RetTy = I->getType();
2364 if (RetTy->isVoidTy())
2365 RetVT = MVT::isVoid;
2366 else if (!isTypeLegal(RetTy, RetVT) && RetVT != MVT::i16 &&
2367 RetVT != MVT::i8 && RetVT != MVT::i1)
2370 // Can't handle non-double multi-reg retvals.
2371 if (RetVT != MVT::isVoid && RetVT != MVT::i1 && RetVT != MVT::i8 &&
2372 RetVT != MVT::i16 && RetVT != MVT::i32) {
2373 SmallVector<CCValAssign, 16> RVLocs;
2374 CCState CCInfo(CC, isVarArg, *FuncInfo.MF, TM, RVLocs, *Context);
2375 CCInfo.AnalyzeCallResult(RetVT, CCAssignFnForCall(CC, true, isVarArg));
2376 if (RVLocs.size() >= 2 && RetVT != MVT::f64)
2380 // Set up the argument vectors.
2381 SmallVector<Value*, 8> Args;
2382 SmallVector<unsigned, 8> ArgRegs;
2383 SmallVector<MVT, 8> ArgVTs;
2384 SmallVector<ISD::ArgFlagsTy, 8> ArgFlags;
2385 unsigned arg_size = CS.arg_size();
2386 Args.reserve(arg_size);
2387 ArgRegs.reserve(arg_size);
2388 ArgVTs.reserve(arg_size);
2389 ArgFlags.reserve(arg_size);
2390 for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
2392 // If we're lowering a memory intrinsic instead of a regular call, skip the
2393 // last two arguments, which shouldn't be passed to the underlying function.
2394 if (IntrMemName && e-i <= 2)
2397 ISD::ArgFlagsTy Flags;
2398 unsigned AttrInd = i - CS.arg_begin() + 1;
2399 if (CS.paramHasAttr(AttrInd, Attribute::SExt))
2401 if (CS.paramHasAttr(AttrInd, Attribute::ZExt))
2404 // FIXME: Only handle *easy* calls for now.
2405 if (CS.paramHasAttr(AttrInd, Attribute::InReg) ||
2406 CS.paramHasAttr(AttrInd, Attribute::StructRet) ||
2407 CS.paramHasAttr(AttrInd, Attribute::Nest) ||
2408 CS.paramHasAttr(AttrInd, Attribute::ByVal))
2411 Type *ArgTy = (*i)->getType();
2413 if (!isTypeLegal(ArgTy, ArgVT) && ArgVT != MVT::i16 && ArgVT != MVT::i8 &&
2417 unsigned Arg = getRegForValue(*i);
2421 unsigned OriginalAlignment = TD.getABITypeAlignment(ArgTy);
2422 Flags.setOrigAlign(OriginalAlignment);
2425 ArgRegs.push_back(Arg);
2426 ArgVTs.push_back(ArgVT);
2427 ArgFlags.push_back(Flags);
2430 // Handle the arguments now that we've gotten them.
2431 SmallVector<unsigned, 4> RegArgs;
2433 if (!ProcessCallArgs(Args, ArgRegs, ArgVTs, ArgFlags,
2434 RegArgs, CC, NumBytes, isVarArg))
2437 bool UseReg = false;
2438 const GlobalValue *GV = dyn_cast<GlobalValue>(Callee);
2439 if (!GV || EnableARMLongCalls) UseReg = true;
2441 unsigned CalleeReg = 0;
2444 CalleeReg = getLibcallReg(IntrMemName);
2446 CalleeReg = getRegForValue(Callee);
2448 if (CalleeReg == 0) return false;
2452 unsigned CallOpc = ARMSelectCallOp(UseReg);
2453 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
2454 DL, TII.get(CallOpc));
2456 // ARM calls don't take a predicate, but tBL / tBLX do.
2458 AddDefaultPred(MIB);
2460 MIB.addReg(CalleeReg);
2461 else if (!IntrMemName)
2462 MIB.addGlobalAddress(GV, 0, 0);
2464 MIB.addExternalSymbol(IntrMemName, 0);
2466 // Add implicit physical register uses to the call.
2467 for (unsigned i = 0, e = RegArgs.size(); i != e; ++i)
2468 MIB.addReg(RegArgs[i], RegState::Implicit);
2470 // Add a register mask with the call-preserved registers.
2471 // Proper defs for return values will be added by setPhysRegsDeadExcept().
2472 MIB.addRegMask(TRI.getCallPreservedMask(CC));
2474 // Finish off the call including any return values.
2475 SmallVector<unsigned, 4> UsedRegs;
2476 if (!FinishCall(RetVT, UsedRegs, I, CC, NumBytes, isVarArg))
2479 // Set all unused physreg defs as dead.
2480 static_cast<MachineInstr *>(MIB)->setPhysRegsDeadExcept(UsedRegs, TRI);
2485 bool ARMFastISel::ARMIsMemCpySmall(uint64_t Len) {
2489 bool ARMFastISel::ARMTryEmitSmallMemCpy(Address Dest, Address Src,
2490 uint64_t Len, unsigned Alignment) {
2491 // Make sure we don't bloat code by inlining very large memcpy's.
2492 if (!ARMIsMemCpySmall(Len))
2497 if (!Alignment || Alignment >= 4) {
2503 assert (Len == 1 && "Expected a length of 1!");
2507 // Bound based on alignment.
2508 if (Len >= 2 && Alignment == 2)
2517 RV = ARMEmitLoad(VT, ResultReg, Src);
2518 assert (RV == true && "Should be able to handle this load.");
2519 RV = ARMEmitStore(VT, ResultReg, Dest);
2520 assert (RV == true && "Should be able to handle this store.");
2523 unsigned Size = VT.getSizeInBits()/8;
2525 Dest.Offset += Size;
2532 bool ARMFastISel::SelectIntrinsicCall(const IntrinsicInst &I) {
2533 // FIXME: Handle more intrinsics.
2534 switch (I.getIntrinsicID()) {
2535 default: return false;
2536 case Intrinsic::frameaddress: {
2537 MachineFrameInfo *MFI = FuncInfo.MF->getFrameInfo();
2538 MFI->setFrameAddressIsTaken(true);
2541 const TargetRegisterClass *RC;
2543 LdrOpc = ARM::t2LDRi12;
2544 RC = (const TargetRegisterClass*)&ARM::tGPRRegClass;
2546 LdrOpc = ARM::LDRi12;
2547 RC = (const TargetRegisterClass*)&ARM::GPRRegClass;
2550 const ARMBaseRegisterInfo *RegInfo =
2551 static_cast<const ARMBaseRegisterInfo*>(TM.getRegisterInfo());
2552 unsigned FramePtr = RegInfo->getFrameRegister(*(FuncInfo.MF));
2553 unsigned SrcReg = FramePtr;
2555 // Recursively load frame address
2561 unsigned Depth = cast<ConstantInt>(I.getOperand(0))->getZExtValue();
2563 DestReg = createResultReg(RC);
2564 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2565 TII.get(LdrOpc), DestReg)
2566 .addReg(SrcReg).addImm(0));
2569 UpdateValueMap(&I, SrcReg);
2572 case Intrinsic::memcpy:
2573 case Intrinsic::memmove: {
2574 const MemTransferInst &MTI = cast<MemTransferInst>(I);
2575 // Don't handle volatile.
2576 if (MTI.isVolatile())
2579 // Disable inlining for memmove before calls to ComputeAddress. Otherwise,
2580 // we would emit dead code because we don't currently handle memmoves.
2581 bool isMemCpy = (I.getIntrinsicID() == Intrinsic::memcpy);
2582 if (isa<ConstantInt>(MTI.getLength()) && isMemCpy) {
2583 // Small memcpy's are common enough that we want to do them without a call
2585 uint64_t Len = cast<ConstantInt>(MTI.getLength())->getZExtValue();
2586 if (ARMIsMemCpySmall(Len)) {
2588 if (!ARMComputeAddress(MTI.getRawDest(), Dest) ||
2589 !ARMComputeAddress(MTI.getRawSource(), Src))
2591 unsigned Alignment = MTI.getAlignment();
2592 if (ARMTryEmitSmallMemCpy(Dest, Src, Len, Alignment))
2597 if (!MTI.getLength()->getType()->isIntegerTy(32))
2600 if (MTI.getSourceAddressSpace() > 255 || MTI.getDestAddressSpace() > 255)
2603 const char *IntrMemName = isa<MemCpyInst>(I) ? "memcpy" : "memmove";
2604 return SelectCall(&I, IntrMemName);
2606 case Intrinsic::memset: {
2607 const MemSetInst &MSI = cast<MemSetInst>(I);
2608 // Don't handle volatile.
2609 if (MSI.isVolatile())
2612 if (!MSI.getLength()->getType()->isIntegerTy(32))
2615 if (MSI.getDestAddressSpace() > 255)
2618 return SelectCall(&I, "memset");
2620 case Intrinsic::trap: {
2621 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(
2622 Subtarget->useNaClTrap() ? ARM::TRAPNaCl : ARM::TRAP));
2628 bool ARMFastISel::SelectTrunc(const Instruction *I) {
2629 // The high bits for a type smaller than the register size are assumed to be
2631 Value *Op = I->getOperand(0);
2634 SrcVT = TLI.getValueType(Op->getType(), true);
2635 DestVT = TLI.getValueType(I->getType(), true);
2637 if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
2639 if (DestVT != MVT::i16 && DestVT != MVT::i8 && DestVT != MVT::i1)
2642 unsigned SrcReg = getRegForValue(Op);
2643 if (!SrcReg) return false;
2645 // Because the high bits are undefined, a truncate doesn't generate
2647 UpdateValueMap(I, SrcReg);
2651 unsigned ARMFastISel::ARMEmitIntExt(MVT SrcVT, unsigned SrcReg, MVT DestVT,
2653 if (DestVT != MVT::i32 && DestVT != MVT::i16 && DestVT != MVT::i8)
2655 if (SrcVT != MVT::i16 && SrcVT != MVT::i8 && SrcVT != MVT::i1)
2658 // Table of which combinations can be emitted as a single instruction,
2659 // and which will require two.
2660 static const uint8_t isSingleInstrTbl[3][2][2][2] = {
2662 // !hasV6Ops hasV6Ops !hasV6Ops hasV6Ops
2663 // ext: s z s z s z s z
2664 /* 1 */ { { { 0, 1 }, { 0, 1 } }, { { 0, 0 }, { 0, 1 } } },
2665 /* 8 */ { { { 0, 1 }, { 1, 1 } }, { { 0, 0 }, { 1, 1 } } },
2666 /* 16 */ { { { 0, 0 }, { 1, 1 } }, { { 0, 0 }, { 1, 1 } } }
2669 // Target registers for:
2670 // - For ARM can never be PC.
2671 // - For 16-bit Thumb are restricted to lower 8 registers.
2672 // - For 32-bit Thumb are restricted to non-SP and non-PC.
2673 static const TargetRegisterClass *RCTbl[2][2] = {
2674 // Instructions: Two Single
2675 /* ARM */ { &ARM::GPRnopcRegClass, &ARM::GPRnopcRegClass },
2676 /* Thumb */ { &ARM::tGPRRegClass, &ARM::rGPRRegClass }
2679 // Table governing the instruction(s) to be emitted.
2680 static const struct InstructionTable {
2682 uint32_t hasS : 1; // Some instructions have an S bit, always set it to 0.
2683 uint32_t Shift : 7; // For shift operand addressing mode, used by MOVsi.
2684 uint32_t Imm : 8; // All instructions have either a shift or a mask.
2685 } IT[2][2][3][2] = {
2686 { // Two instructions (first is left shift, second is in this table).
2687 { // ARM Opc S Shift Imm
2688 /* 1 bit sext */ { { ARM::MOVsi , 1, ARM_AM::asr , 31 },
2689 /* 1 bit zext */ { ARM::MOVsi , 1, ARM_AM::lsr , 31 } },
2690 /* 8 bit sext */ { { ARM::MOVsi , 1, ARM_AM::asr , 24 },
2691 /* 8 bit zext */ { ARM::MOVsi , 1, ARM_AM::lsr , 24 } },
2692 /* 16 bit sext */ { { ARM::MOVsi , 1, ARM_AM::asr , 16 },
2693 /* 16 bit zext */ { ARM::MOVsi , 1, ARM_AM::lsr , 16 } }
2695 { // Thumb Opc S Shift Imm
2696 /* 1 bit sext */ { { ARM::tASRri , 0, ARM_AM::no_shift, 31 },
2697 /* 1 bit zext */ { ARM::tLSRri , 0, ARM_AM::no_shift, 31 } },
2698 /* 8 bit sext */ { { ARM::tASRri , 0, ARM_AM::no_shift, 24 },
2699 /* 8 bit zext */ { ARM::tLSRri , 0, ARM_AM::no_shift, 24 } },
2700 /* 16 bit sext */ { { ARM::tASRri , 0, ARM_AM::no_shift, 16 },
2701 /* 16 bit zext */ { ARM::tLSRri , 0, ARM_AM::no_shift, 16 } }
2704 { // Single instruction.
2705 { // ARM Opc S Shift Imm
2706 /* 1 bit sext */ { { ARM::KILL , 0, ARM_AM::no_shift, 0 },
2707 /* 1 bit zext */ { ARM::ANDri , 1, ARM_AM::no_shift, 1 } },
2708 /* 8 bit sext */ { { ARM::SXTB , 0, ARM_AM::no_shift, 0 },
2709 /* 8 bit zext */ { ARM::ANDri , 1, ARM_AM::no_shift, 255 } },
2710 /* 16 bit sext */ { { ARM::SXTH , 0, ARM_AM::no_shift, 0 },
2711 /* 16 bit zext */ { ARM::UXTH , 0, ARM_AM::no_shift, 0 } }
2713 { // Thumb Opc S Shift Imm
2714 /* 1 bit sext */ { { ARM::KILL , 0, ARM_AM::no_shift, 0 },
2715 /* 1 bit zext */ { ARM::t2ANDri, 1, ARM_AM::no_shift, 1 } },
2716 /* 8 bit sext */ { { ARM::t2SXTB , 0, ARM_AM::no_shift, 0 },
2717 /* 8 bit zext */ { ARM::t2ANDri, 1, ARM_AM::no_shift, 255 } },
2718 /* 16 bit sext */ { { ARM::t2SXTH , 0, ARM_AM::no_shift, 0 },
2719 /* 16 bit zext */ { ARM::t2UXTH , 0, ARM_AM::no_shift, 0 } }
2724 unsigned SrcBits = SrcVT.getSizeInBits();
2725 unsigned DestBits = DestVT.getSizeInBits();
2727 assert((SrcBits < DestBits) && "can only extend to larger types");
2728 assert((DestBits == 32 || DestBits == 16 || DestBits == 8) &&
2729 "other sizes unimplemented");
2730 assert((SrcBits == 16 || SrcBits == 8 || SrcBits == 1) &&
2731 "other sizes unimplemented");
2733 bool hasV6Ops = Subtarget->hasV6Ops();
2734 unsigned Bitness = SrcBits / 8; // {1,8,16}=>{0,1,2}
2735 assert((Bitness < 3) && "sanity-check table bounds");
2737 bool isSingleInstr = isSingleInstrTbl[Bitness][isThumb2][hasV6Ops][isZExt];
2738 const TargetRegisterClass *RC = RCTbl[isThumb2][isSingleInstr];
2739 const InstructionTable *ITP = &IT[isSingleInstr][isThumb2][Bitness][isZExt];
2740 unsigned Opc = ITP->Opc;
2741 assert(ARM::KILL != Opc && "Invalid table entry");
2742 unsigned hasS = ITP->hasS;
2743 ARM_AM::ShiftOpc Shift = (ARM_AM::ShiftOpc) ITP->Shift;
2744 assert(((Shift == ARM_AM::no_shift) == (Opc != ARM::MOVsi)) &&
2745 "only MOVsi has shift operand addressing mode");
2746 unsigned Imm = ITP->Imm;
2748 // 16-bit Thumb instructions always set CPSR (unless they're in an IT block).
2749 bool setsCPSR = &ARM::tGPRRegClass == RC;
2750 unsigned LSLOpc = isThumb2 ? ARM::tLSLri : ARM::MOVsi;
2752 // MOVsi encodes shift and immediate in shift operand addressing mode.
2753 // The following condition has the same value when emitting two
2754 // instruction sequences: both are shifts.
2755 bool ImmIsSO = (Shift != ARM_AM::no_shift);
2757 // Either one or two instructions are emitted.
2758 // They're always of the form:
2760 // CPSR is set only by 16-bit Thumb instructions.
2761 // Predicate, if any, is AL.
2762 // S bit, if available, is always 0.
2763 // When two are emitted the first's result will feed as the second's input,
2764 // that value is then dead.
2765 unsigned NumInstrsEmitted = isSingleInstr ? 1 : 2;
2766 for (unsigned Instr = 0; Instr != NumInstrsEmitted; ++Instr) {
2767 ResultReg = createResultReg(RC);
2768 bool isLsl = (0 == Instr) && !isSingleInstr;
2769 unsigned Opcode = isLsl ? LSLOpc : Opc;
2770 ARM_AM::ShiftOpc ShiftAM = isLsl ? ARM_AM::lsl : Shift;
2771 unsigned ImmEnc = ImmIsSO ? ARM_AM::getSORegOpc(ShiftAM, Imm) : Imm;
2772 bool isKill = 1 == Instr;
2773 MachineInstrBuilder MIB = BuildMI(
2774 *FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opcode), ResultReg);
2776 MIB.addReg(ARM::CPSR, RegState::Define);
2777 SrcReg = constrainOperandRegClass(TII.get(Opcode), SrcReg, 1 + setsCPSR);
2778 AddDefaultPred(MIB.addReg(SrcReg, isKill * RegState::Kill).addImm(ImmEnc));
2781 // Second instruction consumes the first's result.
2788 bool ARMFastISel::SelectIntExt(const Instruction *I) {
2789 // On ARM, in general, integer casts don't involve legal types; this code
2790 // handles promotable integers.
2791 Type *DestTy = I->getType();
2792 Value *Src = I->getOperand(0);
2793 Type *SrcTy = Src->getType();
2795 bool isZExt = isa<ZExtInst>(I);
2796 unsigned SrcReg = getRegForValue(Src);
2797 if (!SrcReg) return false;
2799 EVT SrcEVT, DestEVT;
2800 SrcEVT = TLI.getValueType(SrcTy, true);
2801 DestEVT = TLI.getValueType(DestTy, true);
2802 if (!SrcEVT.isSimple()) return false;
2803 if (!DestEVT.isSimple()) return false;
2805 MVT SrcVT = SrcEVT.getSimpleVT();
2806 MVT DestVT = DestEVT.getSimpleVT();
2807 unsigned ResultReg = ARMEmitIntExt(SrcVT, SrcReg, DestVT, isZExt);
2808 if (ResultReg == 0) return false;
2809 UpdateValueMap(I, ResultReg);
2813 bool ARMFastISel::SelectShift(const Instruction *I,
2814 ARM_AM::ShiftOpc ShiftTy) {
2815 // We handle thumb2 mode by target independent selector
2816 // or SelectionDAG ISel.
2820 // Only handle i32 now.
2821 EVT DestVT = TLI.getValueType(I->getType(), true);
2822 if (DestVT != MVT::i32)
2825 unsigned Opc = ARM::MOVsr;
2827 Value *Src2Value = I->getOperand(1);
2828 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Src2Value)) {
2829 ShiftImm = CI->getZExtValue();
2831 // Fall back to selection DAG isel if the shift amount
2832 // is zero or greater than the width of the value type.
2833 if (ShiftImm == 0 || ShiftImm >=32)
2839 Value *Src1Value = I->getOperand(0);
2840 unsigned Reg1 = getRegForValue(Src1Value);
2841 if (Reg1 == 0) return false;
2844 if (Opc == ARM::MOVsr) {
2845 Reg2 = getRegForValue(Src2Value);
2846 if (Reg2 == 0) return false;
2849 unsigned ResultReg = createResultReg(&ARM::GPRnopcRegClass);
2850 if(ResultReg == 0) return false;
2852 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2853 TII.get(Opc), ResultReg)
2856 if (Opc == ARM::MOVsi)
2857 MIB.addImm(ARM_AM::getSORegOpc(ShiftTy, ShiftImm));
2858 else if (Opc == ARM::MOVsr) {
2860 MIB.addImm(ARM_AM::getSORegOpc(ShiftTy, 0));
2863 AddOptionalDefs(MIB);
2864 UpdateValueMap(I, ResultReg);
2868 // TODO: SoftFP support.
2869 bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
2871 switch (I->getOpcode()) {
2872 case Instruction::Load:
2873 return SelectLoad(I);
2874 case Instruction::Store:
2875 return SelectStore(I);
2876 case Instruction::Br:
2877 return SelectBranch(I);
2878 case Instruction::IndirectBr:
2879 return SelectIndirectBr(I);
2880 case Instruction::ICmp:
2881 case Instruction::FCmp:
2882 return SelectCmp(I);
2883 case Instruction::FPExt:
2884 return SelectFPExt(I);
2885 case Instruction::FPTrunc:
2886 return SelectFPTrunc(I);
2887 case Instruction::SIToFP:
2888 return SelectIToFP(I, /*isSigned*/ true);
2889 case Instruction::UIToFP:
2890 return SelectIToFP(I, /*isSigned*/ false);
2891 case Instruction::FPToSI:
2892 return SelectFPToI(I, /*isSigned*/ true);
2893 case Instruction::FPToUI:
2894 return SelectFPToI(I, /*isSigned*/ false);
2895 case Instruction::Add:
2896 return SelectBinaryIntOp(I, ISD::ADD);
2897 case Instruction::Or:
2898 return SelectBinaryIntOp(I, ISD::OR);
2899 case Instruction::Sub:
2900 return SelectBinaryIntOp(I, ISD::SUB);
2901 case Instruction::FAdd:
2902 return SelectBinaryFPOp(I, ISD::FADD);
2903 case Instruction::FSub:
2904 return SelectBinaryFPOp(I, ISD::FSUB);
2905 case Instruction::FMul:
2906 return SelectBinaryFPOp(I, ISD::FMUL);
2907 case Instruction::SDiv:
2908 return SelectDiv(I, /*isSigned*/ true);
2909 case Instruction::UDiv:
2910 return SelectDiv(I, /*isSigned*/ false);
2911 case Instruction::SRem:
2912 return SelectRem(I, /*isSigned*/ true);
2913 case Instruction::URem:
2914 return SelectRem(I, /*isSigned*/ false);
2915 case Instruction::Call:
2916 if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(I))
2917 return SelectIntrinsicCall(*II);
2918 return SelectCall(I);
2919 case Instruction::Select:
2920 return SelectSelect(I);
2921 case Instruction::Ret:
2922 return SelectRet(I);
2923 case Instruction::Trunc:
2924 return SelectTrunc(I);
2925 case Instruction::ZExt:
2926 case Instruction::SExt:
2927 return SelectIntExt(I);
2928 case Instruction::Shl:
2929 return SelectShift(I, ARM_AM::lsl);
2930 case Instruction::LShr:
2931 return SelectShift(I, ARM_AM::lsr);
2932 case Instruction::AShr:
2933 return SelectShift(I, ARM_AM::asr);
2940 // This table describes sign- and zero-extend instructions which can be
2941 // folded into a preceding load. All of these extends have an immediate
2942 // (sometimes a mask and sometimes a shift) that's applied after
2944 const struct FoldableLoadExtendsStruct {
2945 uint16_t Opc[2]; // ARM, Thumb.
2946 uint8_t ExpectedImm;
2948 uint8_t ExpectedVT : 7;
2949 } FoldableLoadExtends[] = {
2950 { { ARM::SXTH, ARM::t2SXTH }, 0, 0, MVT::i16 },
2951 { { ARM::UXTH, ARM::t2UXTH }, 0, 1, MVT::i16 },
2952 { { ARM::ANDri, ARM::t2ANDri }, 255, 1, MVT::i8 },
2953 { { ARM::SXTB, ARM::t2SXTB }, 0, 0, MVT::i8 },
2954 { { ARM::UXTB, ARM::t2UXTB }, 0, 1, MVT::i8 }
2958 /// \brief The specified machine instr operand is a vreg, and that
2959 /// vreg is being provided by the specified load instruction. If possible,
2960 /// try to fold the load as an operand to the instruction, returning true if
2962 bool ARMFastISel::tryToFoldLoadIntoMI(MachineInstr *MI, unsigned OpNo,
2963 const LoadInst *LI) {
2964 // Verify we have a legal type before going any further.
2966 if (!isLoadTypeLegal(LI->getType(), VT))
2969 // Combine load followed by zero- or sign-extend.
2970 // ldrb r1, [r0] ldrb r1, [r0]
2972 // mov r3, r2 mov r3, r1
2973 if (MI->getNumOperands() < 3 || !MI->getOperand(2).isImm())
2975 const uint64_t Imm = MI->getOperand(2).getImm();
2979 for (unsigned i = 0, e = array_lengthof(FoldableLoadExtends);
2981 if (FoldableLoadExtends[i].Opc[isThumb2] == MI->getOpcode() &&
2982 (uint64_t)FoldableLoadExtends[i].ExpectedImm == Imm &&
2983 MVT((MVT::SimpleValueType)FoldableLoadExtends[i].ExpectedVT) == VT) {
2985 isZExt = FoldableLoadExtends[i].isZExt;
2988 if (!Found) return false;
2990 // See if we can handle this address.
2992 if (!ARMComputeAddress(LI->getOperand(0), Addr)) return false;
2994 unsigned ResultReg = MI->getOperand(0).getReg();
2995 if (!ARMEmitLoad(VT, ResultReg, Addr, LI->getAlignment(), isZExt, false))
2997 MI->eraseFromParent();
3001 unsigned ARMFastISel::ARMLowerPICELF(const GlobalValue *GV,
3002 unsigned Align, MVT VT) {
3003 bool UseGOTOFF = GV->hasLocalLinkage() || GV->hasHiddenVisibility();
3004 ARMConstantPoolConstant *CPV =
3005 ARMConstantPoolConstant::Create(GV, UseGOTOFF ? ARMCP::GOTOFF : ARMCP::GOT);
3006 unsigned Idx = MCP.getConstantPoolIndex(CPV, Align);
3009 unsigned DestReg1 = createResultReg(TLI.getRegClassFor(VT));
3012 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
3013 TII.get(ARM::t2LDRpci), DestReg1)
3014 .addConstantPoolIndex(Idx));
3015 Opc = UseGOTOFF ? ARM::t2ADDrr : ARM::t2LDRs;
3017 // The extra immediate is for addrmode2.
3018 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
3019 DL, TII.get(ARM::LDRcp), DestReg1)
3020 .addConstantPoolIndex(Idx).addImm(0));
3021 Opc = UseGOTOFF ? ARM::ADDrr : ARM::LDRrs;
3024 unsigned GlobalBaseReg = AFI->getGlobalBaseReg();
3025 if (GlobalBaseReg == 0) {
3026 GlobalBaseReg = MRI.createVirtualRegister(TLI.getRegClassFor(VT));
3027 AFI->setGlobalBaseReg(GlobalBaseReg);
3030 unsigned DestReg2 = createResultReg(TLI.getRegClassFor(VT));
3031 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
3032 DL, TII.get(Opc), DestReg2)
3034 .addReg(GlobalBaseReg);
3037 AddOptionalDefs(MIB);
3042 bool ARMFastISel::FastLowerArguments() {
3043 if (!FuncInfo.CanLowerReturn)
3046 const Function *F = FuncInfo.Fn;
3050 CallingConv::ID CC = F->getCallingConv();
3054 case CallingConv::Fast:
3055 case CallingConv::C:
3056 case CallingConv::ARM_AAPCS_VFP:
3057 case CallingConv::ARM_AAPCS:
3058 case CallingConv::ARM_APCS:
3062 // Only handle simple cases. i.e. Up to 4 i8/i16/i32 scalar arguments
3063 // which are passed in r0 - r3.
3065 for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
3066 I != E; ++I, ++Idx) {
3070 if (F->getAttributes().hasAttribute(Idx, Attribute::InReg) ||
3071 F->getAttributes().hasAttribute(Idx, Attribute::StructRet) ||
3072 F->getAttributes().hasAttribute(Idx, Attribute::ByVal))
3075 Type *ArgTy = I->getType();
3076 if (ArgTy->isStructTy() || ArgTy->isArrayTy() || ArgTy->isVectorTy())
3079 EVT ArgVT = TLI.getValueType(ArgTy);
3080 if (!ArgVT.isSimple()) return false;
3081 switch (ArgVT.getSimpleVT().SimpleTy) {
3092 static const uint16_t GPRArgRegs[] = {
3093 ARM::R0, ARM::R1, ARM::R2, ARM::R3
3096 const TargetRegisterClass *RC = &ARM::rGPRRegClass;
3098 for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
3099 I != E; ++I, ++Idx) {
3100 unsigned SrcReg = GPRArgRegs[Idx];
3101 unsigned DstReg = FuncInfo.MF->addLiveIn(SrcReg, RC);
3102 // FIXME: Unfortunately it's necessary to emit a copy from the livein copy.
3103 // Without this, EmitLiveInCopies may eliminate the livein if its only
3104 // use is a bitcast (which isn't turned into an instruction).
3105 unsigned ResultReg = createResultReg(RC);
3106 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
3107 ResultReg).addReg(DstReg, getKillRegState(true));
3108 UpdateValueMap(I, ResultReg);
3115 FastISel *ARM::createFastISel(FunctionLoweringInfo &funcInfo,
3116 const TargetLibraryInfo *libInfo) {
3117 const TargetMachine &TM = funcInfo.MF->getTarget();
3119 const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
3120 // Thumb2 support on iOS; ARM support on iOS, Linux and NaCl.
3121 bool UseFastISel = false;
3122 UseFastISel |= Subtarget->isTargetIOS() && !Subtarget->isThumb1Only();
3123 UseFastISel |= Subtarget->isTargetLinux() && !Subtarget->isThumb();
3124 UseFastISel |= Subtarget->isTargetNaCl() && !Subtarget->isThumb();
3127 // iOS always has a FP for backtracking, force other targets
3128 // to keep their FP when doing FastISel. The emitted code is
3129 // currently superior, and in cases like test-suite's lencod
3130 // FastISel isn't quite correct when FP is eliminated.
3131 TM.Options.NoFramePointerElim = true;
3132 return new ARMFastISel(funcInfo, libInfo);