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 "ARMRegisterInfo.h"
20 #include "ARMTargetMachine.h"
21 #include "ARMSubtarget.h"
22 #include "ARMConstantPoolValue.h"
23 #include "MCTargetDesc/ARMAddressingModes.h"
24 #include "llvm/CallingConv.h"
25 #include "llvm/DerivedTypes.h"
26 #include "llvm/GlobalVariable.h"
27 #include "llvm/Instructions.h"
28 #include "llvm/IntrinsicInst.h"
29 #include "llvm/Module.h"
30 #include "llvm/Operator.h"
31 #include "llvm/CodeGen/Analysis.h"
32 #include "llvm/CodeGen/FastISel.h"
33 #include "llvm/CodeGen/FunctionLoweringInfo.h"
34 #include "llvm/CodeGen/MachineInstrBuilder.h"
35 #include "llvm/CodeGen/MachineModuleInfo.h"
36 #include "llvm/CodeGen/MachineConstantPool.h"
37 #include "llvm/CodeGen/MachineFrameInfo.h"
38 #include "llvm/CodeGen/MachineMemOperand.h"
39 #include "llvm/CodeGen/MachineRegisterInfo.h"
40 #include "llvm/Support/CallSite.h"
41 #include "llvm/Support/CommandLine.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/GetElementPtrTypeIterator.h"
44 #include "llvm/Target/TargetData.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"
52 DisableARMFastISel("disable-arm-fast-isel",
53 cl::desc("Turn off experimental ARM fast-isel support"),
54 cl::init(false), cl::Hidden);
56 extern cl::opt<bool> EnableARMLongCalls;
60 // All possible address modes, plus some.
61 typedef struct Address {
74 // Innocuous defaults for our address.
76 : BaseType(RegBase), Offset(0) {
81 class ARMFastISel : public FastISel {
83 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
84 /// make the right decision when generating code for different targets.
85 const ARMSubtarget *Subtarget;
86 const TargetMachine &TM;
87 const TargetInstrInfo &TII;
88 const TargetLowering &TLI;
91 // Convenience variables to avoid some queries.
96 explicit ARMFastISel(FunctionLoweringInfo &funcInfo)
98 TM(funcInfo.MF->getTarget()),
99 TII(*TM.getInstrInfo()),
100 TLI(*TM.getTargetLowering()) {
101 Subtarget = &TM.getSubtarget<ARMSubtarget>();
102 AFI = funcInfo.MF->getInfo<ARMFunctionInfo>();
103 isThumb2 = AFI->isThumbFunction();
104 Context = &funcInfo.Fn->getContext();
107 // Code from FastISel.cpp.
108 virtual unsigned FastEmitInst_(unsigned MachineInstOpcode,
109 const TargetRegisterClass *RC);
110 virtual unsigned FastEmitInst_r(unsigned MachineInstOpcode,
111 const TargetRegisterClass *RC,
112 unsigned Op0, bool Op0IsKill);
113 virtual unsigned FastEmitInst_rr(unsigned MachineInstOpcode,
114 const TargetRegisterClass *RC,
115 unsigned Op0, bool Op0IsKill,
116 unsigned Op1, bool Op1IsKill);
117 virtual unsigned FastEmitInst_rrr(unsigned MachineInstOpcode,
118 const TargetRegisterClass *RC,
119 unsigned Op0, bool Op0IsKill,
120 unsigned Op1, bool Op1IsKill,
121 unsigned Op2, bool Op2IsKill);
122 virtual unsigned FastEmitInst_ri(unsigned MachineInstOpcode,
123 const TargetRegisterClass *RC,
124 unsigned Op0, bool Op0IsKill,
126 virtual unsigned FastEmitInst_rf(unsigned MachineInstOpcode,
127 const TargetRegisterClass *RC,
128 unsigned Op0, bool Op0IsKill,
129 const ConstantFP *FPImm);
130 virtual unsigned FastEmitInst_rri(unsigned MachineInstOpcode,
131 const TargetRegisterClass *RC,
132 unsigned Op0, bool Op0IsKill,
133 unsigned Op1, bool Op1IsKill,
135 virtual unsigned FastEmitInst_i(unsigned MachineInstOpcode,
136 const TargetRegisterClass *RC,
138 virtual unsigned FastEmitInst_ii(unsigned MachineInstOpcode,
139 const TargetRegisterClass *RC,
140 uint64_t Imm1, uint64_t Imm2);
142 virtual unsigned FastEmitInst_extractsubreg(MVT RetVT,
143 unsigned Op0, bool Op0IsKill,
146 // Backend specific FastISel code.
147 virtual bool TargetSelectInstruction(const Instruction *I);
148 virtual unsigned TargetMaterializeConstant(const Constant *C);
149 virtual unsigned TargetMaterializeAlloca(const AllocaInst *AI);
150 virtual bool TryToFoldLoad(MachineInstr *MI, unsigned OpNo,
153 #include "ARMGenFastISel.inc"
155 // Instruction selection routines.
157 bool SelectLoad(const Instruction *I);
158 bool SelectStore(const Instruction *I);
159 bool SelectBranch(const Instruction *I);
160 bool SelectCmp(const Instruction *I);
161 bool SelectFPExt(const Instruction *I);
162 bool SelectFPTrunc(const Instruction *I);
163 bool SelectBinaryOp(const Instruction *I, unsigned ISDOpcode);
164 bool SelectSIToFP(const Instruction *I);
165 bool SelectFPToSI(const Instruction *I);
166 bool SelectSDiv(const Instruction *I);
167 bool SelectSRem(const Instruction *I);
168 bool SelectCall(const Instruction *I, const char *IntrMemName);
169 bool SelectIntrinsicCall(const IntrinsicInst &I);
170 bool SelectSelect(const Instruction *I);
171 bool SelectRet(const Instruction *I);
172 bool SelectTrunc(const Instruction *I);
173 bool SelectIntExt(const Instruction *I);
177 bool isTypeLegal(Type *Ty, MVT &VT);
178 bool isLoadTypeLegal(Type *Ty, MVT &VT);
179 bool ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
181 bool ARMEmitLoad(EVT VT, unsigned &ResultReg, Address &Addr,
182 unsigned Alignment = 0, bool isZExt = true,
183 bool allocReg = true);
185 bool ARMEmitStore(EVT VT, unsigned SrcReg, Address &Addr,
186 unsigned Alignment = 0);
187 bool ARMComputeAddress(const Value *Obj, Address &Addr);
188 void ARMSimplifyAddress(Address &Addr, EVT VT, bool useAM3);
189 bool ARMIsMemCpySmall(uint64_t Len);
190 bool ARMTryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len);
191 unsigned ARMEmitIntExt(EVT SrcVT, unsigned SrcReg, EVT DestVT, bool isZExt);
192 unsigned ARMMaterializeFP(const ConstantFP *CFP, EVT VT);
193 unsigned ARMMaterializeInt(const Constant *C, EVT VT);
194 unsigned ARMMaterializeGV(const GlobalValue *GV, EVT VT);
195 unsigned ARMMoveToFPReg(EVT VT, unsigned SrcReg);
196 unsigned ARMMoveToIntReg(EVT VT, unsigned SrcReg);
197 unsigned ARMSelectCallOp(const GlobalValue *GV);
199 // Call handling routines.
201 CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool Return);
202 bool ProcessCallArgs(SmallVectorImpl<Value*> &Args,
203 SmallVectorImpl<unsigned> &ArgRegs,
204 SmallVectorImpl<MVT> &ArgVTs,
205 SmallVectorImpl<ISD::ArgFlagsTy> &ArgFlags,
206 SmallVectorImpl<unsigned> &RegArgs,
209 bool FinishCall(MVT RetVT, SmallVectorImpl<unsigned> &UsedRegs,
210 const Instruction *I, CallingConv::ID CC,
212 bool ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call);
214 // OptionalDef handling routines.
216 bool isARMNEONPred(const MachineInstr *MI);
217 bool DefinesOptionalPredicate(MachineInstr *MI, bool *CPSR);
218 const MachineInstrBuilder &AddOptionalDefs(const MachineInstrBuilder &MIB);
219 void AddLoadStoreOperands(EVT VT, Address &Addr,
220 const MachineInstrBuilder &MIB,
221 unsigned Flags, bool useAM3);
224 } // end anonymous namespace
226 #include "ARMGenCallingConv.inc"
228 // DefinesOptionalPredicate - This is different from DefinesPredicate in that
229 // we don't care about implicit defs here, just places we'll need to add a
230 // default CCReg argument. Sets CPSR if we're setting CPSR instead of CCR.
231 bool ARMFastISel::DefinesOptionalPredicate(MachineInstr *MI, bool *CPSR) {
232 if (!MI->hasOptionalDef())
235 // Look to see if our OptionalDef is defining CPSR or CCR.
236 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
237 const MachineOperand &MO = MI->getOperand(i);
238 if (!MO.isReg() || !MO.isDef()) continue;
239 if (MO.getReg() == ARM::CPSR)
245 bool ARMFastISel::isARMNEONPred(const MachineInstr *MI) {
246 const MCInstrDesc &MCID = MI->getDesc();
248 // If we're a thumb2 or not NEON function we were handled via isPredicable.
249 if ((MCID.TSFlags & ARMII::DomainMask) != ARMII::DomainNEON ||
250 AFI->isThumb2Function())
253 for (unsigned i = 0, e = MCID.getNumOperands(); i != e; ++i)
254 if (MCID.OpInfo[i].isPredicate())
260 // If the machine is predicable go ahead and add the predicate operands, if
261 // it needs default CC operands add those.
262 // TODO: If we want to support thumb1 then we'll need to deal with optional
263 // CPSR defs that need to be added before the remaining operands. See s_cc_out
264 // for descriptions why.
265 const MachineInstrBuilder &
266 ARMFastISel::AddOptionalDefs(const MachineInstrBuilder &MIB) {
267 MachineInstr *MI = &*MIB;
269 // Do we use a predicate? or...
270 // Are we NEON in ARM mode and have a predicate operand? If so, I know
271 // we're not predicable but add it anyways.
272 if (TII.isPredicable(MI) || isARMNEONPred(MI))
275 // Do we optionally set a predicate? Preds is size > 0 iff the predicate
276 // defines CPSR. All other OptionalDefines in ARM are the CCR register.
278 if (DefinesOptionalPredicate(MI, &CPSR)) {
287 unsigned ARMFastISel::FastEmitInst_(unsigned MachineInstOpcode,
288 const TargetRegisterClass* RC) {
289 unsigned ResultReg = createResultReg(RC);
290 const MCInstrDesc &II = TII.get(MachineInstOpcode);
292 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg));
296 unsigned ARMFastISel::FastEmitInst_r(unsigned MachineInstOpcode,
297 const TargetRegisterClass *RC,
298 unsigned Op0, bool Op0IsKill) {
299 unsigned ResultReg = createResultReg(RC);
300 const MCInstrDesc &II = TII.get(MachineInstOpcode);
302 if (II.getNumDefs() >= 1)
303 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
304 .addReg(Op0, Op0IsKill * RegState::Kill));
306 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
307 .addReg(Op0, Op0IsKill * RegState::Kill));
308 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
309 TII.get(TargetOpcode::COPY), ResultReg)
310 .addReg(II.ImplicitDefs[0]));
315 unsigned ARMFastISel::FastEmitInst_rr(unsigned MachineInstOpcode,
316 const TargetRegisterClass *RC,
317 unsigned Op0, bool Op0IsKill,
318 unsigned Op1, bool Op1IsKill) {
319 unsigned ResultReg = createResultReg(RC);
320 const MCInstrDesc &II = TII.get(MachineInstOpcode);
322 if (II.getNumDefs() >= 1)
323 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
324 .addReg(Op0, Op0IsKill * RegState::Kill)
325 .addReg(Op1, Op1IsKill * RegState::Kill));
327 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
328 .addReg(Op0, Op0IsKill * RegState::Kill)
329 .addReg(Op1, Op1IsKill * RegState::Kill));
330 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
331 TII.get(TargetOpcode::COPY), ResultReg)
332 .addReg(II.ImplicitDefs[0]));
337 unsigned ARMFastISel::FastEmitInst_rrr(unsigned MachineInstOpcode,
338 const TargetRegisterClass *RC,
339 unsigned Op0, bool Op0IsKill,
340 unsigned Op1, bool Op1IsKill,
341 unsigned Op2, bool Op2IsKill) {
342 unsigned ResultReg = createResultReg(RC);
343 const MCInstrDesc &II = TII.get(MachineInstOpcode);
345 if (II.getNumDefs() >= 1)
346 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
347 .addReg(Op0, Op0IsKill * RegState::Kill)
348 .addReg(Op1, Op1IsKill * RegState::Kill)
349 .addReg(Op2, Op2IsKill * RegState::Kill));
351 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
352 .addReg(Op0, Op0IsKill * RegState::Kill)
353 .addReg(Op1, Op1IsKill * RegState::Kill)
354 .addReg(Op2, Op2IsKill * RegState::Kill));
355 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
356 TII.get(TargetOpcode::COPY), ResultReg)
357 .addReg(II.ImplicitDefs[0]));
362 unsigned ARMFastISel::FastEmitInst_ri(unsigned MachineInstOpcode,
363 const TargetRegisterClass *RC,
364 unsigned Op0, bool Op0IsKill,
366 unsigned ResultReg = createResultReg(RC);
367 const MCInstrDesc &II = TII.get(MachineInstOpcode);
369 if (II.getNumDefs() >= 1)
370 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
371 .addReg(Op0, Op0IsKill * RegState::Kill)
374 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
375 .addReg(Op0, Op0IsKill * RegState::Kill)
377 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
378 TII.get(TargetOpcode::COPY), ResultReg)
379 .addReg(II.ImplicitDefs[0]));
384 unsigned ARMFastISel::FastEmitInst_rf(unsigned MachineInstOpcode,
385 const TargetRegisterClass *RC,
386 unsigned Op0, bool Op0IsKill,
387 const ConstantFP *FPImm) {
388 unsigned ResultReg = createResultReg(RC);
389 const MCInstrDesc &II = TII.get(MachineInstOpcode);
391 if (II.getNumDefs() >= 1)
392 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
393 .addReg(Op0, Op0IsKill * RegState::Kill)
396 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
397 .addReg(Op0, Op0IsKill * RegState::Kill)
399 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
400 TII.get(TargetOpcode::COPY), ResultReg)
401 .addReg(II.ImplicitDefs[0]));
406 unsigned ARMFastISel::FastEmitInst_rri(unsigned MachineInstOpcode,
407 const TargetRegisterClass *RC,
408 unsigned Op0, bool Op0IsKill,
409 unsigned Op1, bool Op1IsKill,
411 unsigned ResultReg = createResultReg(RC);
412 const MCInstrDesc &II = TII.get(MachineInstOpcode);
414 if (II.getNumDefs() >= 1)
415 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
416 .addReg(Op0, Op0IsKill * RegState::Kill)
417 .addReg(Op1, Op1IsKill * RegState::Kill)
420 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
421 .addReg(Op0, Op0IsKill * RegState::Kill)
422 .addReg(Op1, Op1IsKill * RegState::Kill)
424 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
425 TII.get(TargetOpcode::COPY), ResultReg)
426 .addReg(II.ImplicitDefs[0]));
431 unsigned ARMFastISel::FastEmitInst_i(unsigned MachineInstOpcode,
432 const TargetRegisterClass *RC,
434 unsigned ResultReg = createResultReg(RC);
435 const MCInstrDesc &II = TII.get(MachineInstOpcode);
437 if (II.getNumDefs() >= 1)
438 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
441 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
443 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
444 TII.get(TargetOpcode::COPY), ResultReg)
445 .addReg(II.ImplicitDefs[0]));
450 unsigned ARMFastISel::FastEmitInst_ii(unsigned MachineInstOpcode,
451 const TargetRegisterClass *RC,
452 uint64_t Imm1, uint64_t Imm2) {
453 unsigned ResultReg = createResultReg(RC);
454 const MCInstrDesc &II = TII.get(MachineInstOpcode);
456 if (II.getNumDefs() >= 1)
457 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II, ResultReg)
458 .addImm(Imm1).addImm(Imm2));
460 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, II)
461 .addImm(Imm1).addImm(Imm2));
462 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
463 TII.get(TargetOpcode::COPY),
465 .addReg(II.ImplicitDefs[0]));
470 unsigned ARMFastISel::FastEmitInst_extractsubreg(MVT RetVT,
471 unsigned Op0, bool Op0IsKill,
473 unsigned ResultReg = createResultReg(TLI.getRegClassFor(RetVT));
474 assert(TargetRegisterInfo::isVirtualRegister(Op0) &&
475 "Cannot yet extract from physregs");
476 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt,
477 DL, TII.get(TargetOpcode::COPY), ResultReg)
478 .addReg(Op0, getKillRegState(Op0IsKill), Idx));
482 // TODO: Don't worry about 64-bit now, but when this is fixed remove the
483 // checks from the various callers.
484 unsigned ARMFastISel::ARMMoveToFPReg(EVT VT, unsigned SrcReg) {
485 if (VT == MVT::f64) return 0;
487 unsigned MoveReg = createResultReg(TLI.getRegClassFor(VT));
488 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
489 TII.get(ARM::VMOVRS), MoveReg)
494 unsigned ARMFastISel::ARMMoveToIntReg(EVT VT, unsigned SrcReg) {
495 if (VT == MVT::i64) return 0;
497 unsigned MoveReg = createResultReg(TLI.getRegClassFor(VT));
498 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
499 TII.get(ARM::VMOVSR), MoveReg)
504 // For double width floating point we need to materialize two constants
505 // (the high and the low) into integer registers then use a move to get
506 // the combined constant into an FP reg.
507 unsigned ARMFastISel::ARMMaterializeFP(const ConstantFP *CFP, EVT VT) {
508 const APFloat Val = CFP->getValueAPF();
509 bool is64bit = VT == MVT::f64;
511 // This checks to see if we can use VFP3 instructions to materialize
512 // a constant, otherwise we have to go through the constant pool.
513 if (TLI.isFPImmLegal(Val, VT)) {
517 Imm = ARM_AM::getFP64Imm(Val);
520 Imm = ARM_AM::getFP32Imm(Val);
523 unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
524 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
530 // Require VFP2 for loading fp constants.
531 if (!Subtarget->hasVFP2()) return false;
533 // MachineConstantPool wants an explicit alignment.
534 unsigned Align = TD.getPrefTypeAlignment(CFP->getType());
536 // TODO: Figure out if this is correct.
537 Align = TD.getTypeAllocSize(CFP->getType());
539 unsigned Idx = MCP.getConstantPoolIndex(cast<Constant>(CFP), Align);
540 unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
541 unsigned Opc = is64bit ? ARM::VLDRD : ARM::VLDRS;
543 // The extra reg is for addrmode5.
544 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
546 .addConstantPoolIndex(Idx)
551 unsigned ARMFastISel::ARMMaterializeInt(const Constant *C, EVT VT) {
553 if (VT != MVT::i32 && VT != MVT::i16 && VT != MVT::i8 && VT != MVT::i1)
556 // If we can do this in a single instruction without a constant pool entry
558 const ConstantInt *CI = cast<ConstantInt>(C);
559 if (Subtarget->hasV6T2Ops() && isUInt<16>(CI->getZExtValue())) {
560 unsigned Opc = isThumb2 ? ARM::t2MOVi16 : ARM::MOVi16;
561 unsigned ImmReg = createResultReg(TLI.getRegClassFor(MVT::i32));
562 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
563 TII.get(Opc), ImmReg)
564 .addImm(CI->getZExtValue()));
568 // Use MVN to emit negative constants.
569 if (VT == MVT::i32 && Subtarget->hasV6T2Ops() && CI->isNegative()) {
570 unsigned Imm = (unsigned)~(CI->getSExtValue());
571 bool UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
572 (ARM_AM::getSOImmVal(Imm) != -1);
574 unsigned Opc = isThumb2 ? ARM::t2MVNi : ARM::MVNi;
575 unsigned ImmReg = createResultReg(TLI.getRegClassFor(MVT::i32));
576 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
577 TII.get(Opc), ImmReg)
583 // Load from constant pool. For now 32-bit only.
587 unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
589 // MachineConstantPool wants an explicit alignment.
590 unsigned Align = TD.getPrefTypeAlignment(C->getType());
592 // TODO: Figure out if this is correct.
593 Align = TD.getTypeAllocSize(C->getType());
595 unsigned Idx = MCP.getConstantPoolIndex(C, Align);
598 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
599 TII.get(ARM::t2LDRpci), DestReg)
600 .addConstantPoolIndex(Idx));
602 // The extra immediate is for addrmode2.
603 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
604 TII.get(ARM::LDRcp), DestReg)
605 .addConstantPoolIndex(Idx)
611 unsigned ARMFastISel::ARMMaterializeGV(const GlobalValue *GV, EVT VT) {
612 // For now 32-bit only.
613 if (VT != MVT::i32) return 0;
615 Reloc::Model RelocM = TM.getRelocationModel();
617 // TODO: Need more magic for ARM PIC.
618 if (!isThumb2 && (RelocM == Reloc::PIC_)) return 0;
620 unsigned DestReg = createResultReg(TLI.getRegClassFor(VT));
622 // Use movw+movt when possible, it avoids constant pool entries.
623 // Darwin targets don't support movt with Reloc::Static, see
624 // ARMTargetLowering::LowerGlobalAddressDarwin. Other targets only support
625 // static movt relocations.
626 if (Subtarget->useMovt() &&
627 Subtarget->isTargetDarwin() == (RelocM != Reloc::Static)) {
631 Opc = isThumb2 ? ARM::t2MOV_ga_pcrel : ARM::MOV_ga_pcrel;
633 case Reloc::DynamicNoPIC:
634 Opc = isThumb2 ? ARM::t2MOV_ga_dyn : ARM::MOV_ga_dyn;
637 Opc = isThumb2 ? ARM::t2MOVi32imm : ARM::MOVi32imm;
640 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
641 DestReg).addGlobalAddress(GV));
643 // MachineConstantPool wants an explicit alignment.
644 unsigned Align = TD.getPrefTypeAlignment(GV->getType());
646 // TODO: Figure out if this is correct.
647 Align = TD.getTypeAllocSize(GV->getType());
651 unsigned PCAdj = (RelocM != Reloc::PIC_) ? 0 :
652 (Subtarget->isThumb() ? 4 : 8);
653 unsigned Id = AFI->createPICLabelUId();
654 ARMConstantPoolValue *CPV = ARMConstantPoolConstant::Create(GV, Id,
657 unsigned Idx = MCP.getConstantPoolIndex(CPV, Align);
660 MachineInstrBuilder MIB;
662 unsigned Opc = (RelocM!=Reloc::PIC_) ? ARM::t2LDRpci : ARM::t2LDRpci_pic;
663 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc), DestReg)
664 .addConstantPoolIndex(Idx);
665 if (RelocM == Reloc::PIC_)
668 // The extra immediate is for addrmode2.
669 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(ARM::LDRcp),
671 .addConstantPoolIndex(Idx)
674 AddOptionalDefs(MIB);
677 if (Subtarget->GVIsIndirectSymbol(GV, RelocM)) {
678 MachineInstrBuilder MIB;
679 unsigned NewDestReg = createResultReg(TLI.getRegClassFor(VT));
681 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
682 TII.get(ARM::t2LDRi12), NewDestReg)
686 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(ARM::LDRi12),
690 DestReg = NewDestReg;
691 AddOptionalDefs(MIB);
697 unsigned ARMFastISel::TargetMaterializeConstant(const Constant *C) {
698 EVT VT = TLI.getValueType(C->getType(), true);
700 // Only handle simple types.
701 if (!VT.isSimple()) return 0;
703 if (const ConstantFP *CFP = dyn_cast<ConstantFP>(C))
704 return ARMMaterializeFP(CFP, VT);
705 else if (const GlobalValue *GV = dyn_cast<GlobalValue>(C))
706 return ARMMaterializeGV(GV, VT);
707 else if (isa<ConstantInt>(C))
708 return ARMMaterializeInt(C, VT);
713 // TODO: unsigned ARMFastISel::TargetMaterializeFloatZero(const ConstantFP *CF);
715 unsigned ARMFastISel::TargetMaterializeAlloca(const AllocaInst *AI) {
716 // Don't handle dynamic allocas.
717 if (!FuncInfo.StaticAllocaMap.count(AI)) return 0;
720 if (!isLoadTypeLegal(AI->getType(), VT)) return false;
722 DenseMap<const AllocaInst*, int>::iterator SI =
723 FuncInfo.StaticAllocaMap.find(AI);
725 // This will get lowered later into the correct offsets and registers
726 // via rewriteXFrameIndex.
727 if (SI != FuncInfo.StaticAllocaMap.end()) {
728 TargetRegisterClass* RC = TLI.getRegClassFor(VT);
729 unsigned ResultReg = createResultReg(RC);
730 unsigned Opc = isThumb2 ? ARM::t2ADDri : ARM::ADDri;
731 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
732 TII.get(Opc), ResultReg)
733 .addFrameIndex(SI->second)
741 bool ARMFastISel::isTypeLegal(Type *Ty, MVT &VT) {
742 EVT evt = TLI.getValueType(Ty, true);
744 // Only handle simple types.
745 if (evt == MVT::Other || !evt.isSimple()) return false;
746 VT = evt.getSimpleVT();
748 // Handle all legal types, i.e. a register that will directly hold this
750 return TLI.isTypeLegal(VT);
753 bool ARMFastISel::isLoadTypeLegal(Type *Ty, MVT &VT) {
754 if (isTypeLegal(Ty, VT)) return true;
756 // If this is a type than can be sign or zero-extended to a basic operation
757 // go ahead and accept it now.
758 if (VT == MVT::i1 || VT == MVT::i8 || VT == MVT::i16)
764 // Computes the address to get to an object.
765 bool ARMFastISel::ARMComputeAddress(const Value *Obj, Address &Addr) {
766 // Some boilerplate from the X86 FastISel.
767 const User *U = NULL;
768 unsigned Opcode = Instruction::UserOp1;
769 if (const Instruction *I = dyn_cast<Instruction>(Obj)) {
770 // Don't walk into other basic blocks unless the object is an alloca from
771 // another block, otherwise it may not have a virtual register assigned.
772 if (FuncInfo.StaticAllocaMap.count(static_cast<const AllocaInst *>(Obj)) ||
773 FuncInfo.MBBMap[I->getParent()] == FuncInfo.MBB) {
774 Opcode = I->getOpcode();
777 } else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(Obj)) {
778 Opcode = C->getOpcode();
782 if (PointerType *Ty = dyn_cast<PointerType>(Obj->getType()))
783 if (Ty->getAddressSpace() > 255)
784 // Fast instruction selection doesn't support the special
791 case Instruction::BitCast: {
792 // Look through bitcasts.
793 return ARMComputeAddress(U->getOperand(0), Addr);
795 case Instruction::IntToPtr: {
796 // Look past no-op inttoptrs.
797 if (TLI.getValueType(U->getOperand(0)->getType()) == TLI.getPointerTy())
798 return ARMComputeAddress(U->getOperand(0), Addr);
801 case Instruction::PtrToInt: {
802 // Look past no-op ptrtoints.
803 if (TLI.getValueType(U->getType()) == TLI.getPointerTy())
804 return ARMComputeAddress(U->getOperand(0), Addr);
807 case Instruction::GetElementPtr: {
808 Address SavedAddr = Addr;
809 int TmpOffset = Addr.Offset;
811 // Iterate through the GEP folding the constants into offsets where
813 gep_type_iterator GTI = gep_type_begin(U);
814 for (User::const_op_iterator i = U->op_begin() + 1, e = U->op_end();
815 i != e; ++i, ++GTI) {
816 const Value *Op = *i;
817 if (StructType *STy = dyn_cast<StructType>(*GTI)) {
818 const StructLayout *SL = TD.getStructLayout(STy);
819 unsigned Idx = cast<ConstantInt>(Op)->getZExtValue();
820 TmpOffset += SL->getElementOffset(Idx);
822 uint64_t S = TD.getTypeAllocSize(GTI.getIndexedType());
824 if (const ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
825 // Constant-offset addressing.
826 TmpOffset += CI->getSExtValue() * S;
829 if (isa<AddOperator>(Op) &&
830 (!isa<Instruction>(Op) ||
831 FuncInfo.MBBMap[cast<Instruction>(Op)->getParent()]
833 isa<ConstantInt>(cast<AddOperator>(Op)->getOperand(1))) {
834 // An add (in the same block) with a constant operand. Fold the
837 cast<ConstantInt>(cast<AddOperator>(Op)->getOperand(1));
838 TmpOffset += CI->getSExtValue() * S;
839 // Iterate on the other operand.
840 Op = cast<AddOperator>(Op)->getOperand(0);
844 goto unsupported_gep;
849 // Try to grab the base operand now.
850 Addr.Offset = TmpOffset;
851 if (ARMComputeAddress(U->getOperand(0), Addr)) return true;
853 // We failed, restore everything and try the other options.
859 case Instruction::Alloca: {
860 const AllocaInst *AI = cast<AllocaInst>(Obj);
861 DenseMap<const AllocaInst*, int>::iterator SI =
862 FuncInfo.StaticAllocaMap.find(AI);
863 if (SI != FuncInfo.StaticAllocaMap.end()) {
864 Addr.BaseType = Address::FrameIndexBase;
865 Addr.Base.FI = SI->second;
872 // Try to get this in a register if nothing else has worked.
873 if (Addr.Base.Reg == 0) Addr.Base.Reg = getRegForValue(Obj);
874 return Addr.Base.Reg != 0;
877 void ARMFastISel::ARMSimplifyAddress(Address &Addr, EVT VT, bool useAM3) {
879 assert(VT.isSimple() && "Non-simple types are invalid here!");
881 bool needsLowering = false;
882 switch (VT.getSimpleVT().SimpleTy) {
884 assert(false && "Unhandled load/store type!");
891 // Integer loads/stores handle 12-bit offsets.
892 needsLowering = ((Addr.Offset & 0xfff) != Addr.Offset);
893 // Handle negative offsets.
894 if (needsLowering && isThumb2)
895 needsLowering = !(Subtarget->hasV6T2Ops() && Addr.Offset < 0 &&
898 // ARM halfword load/stores and signed byte loads use +/-imm8 offsets.
899 needsLowering = (Addr.Offset > 255 || Addr.Offset < -255);
904 // Floating point operands handle 8-bit offsets.
905 needsLowering = ((Addr.Offset & 0xff) != Addr.Offset);
909 // If this is a stack pointer and the offset needs to be simplified then
910 // put the alloca address into a register, set the base type back to
911 // register and continue. This should almost never happen.
912 if (needsLowering && Addr.BaseType == Address::FrameIndexBase) {
913 TargetRegisterClass *RC = isThumb2 ? ARM::tGPRRegisterClass :
914 ARM::GPRRegisterClass;
915 unsigned ResultReg = createResultReg(RC);
916 unsigned Opc = isThumb2 ? ARM::t2ADDri : ARM::ADDri;
917 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
918 TII.get(Opc), ResultReg)
919 .addFrameIndex(Addr.Base.FI)
921 Addr.Base.Reg = ResultReg;
922 Addr.BaseType = Address::RegBase;
925 // Since the offset is too large for the load/store instruction
926 // get the reg+offset into a register.
928 Addr.Base.Reg = FastEmit_ri_(MVT::i32, ISD::ADD, Addr.Base.Reg,
929 /*Op0IsKill*/false, Addr.Offset, MVT::i32);
934 void ARMFastISel::AddLoadStoreOperands(EVT VT, Address &Addr,
935 const MachineInstrBuilder &MIB,
936 unsigned Flags, bool useAM3) {
937 // addrmode5 output depends on the selection dag addressing dividing the
938 // offset by 4 that it then later multiplies. Do this here as well.
939 if (VT.getSimpleVT().SimpleTy == MVT::f32 ||
940 VT.getSimpleVT().SimpleTy == MVT::f64)
943 // Frame base works a bit differently. Handle it separately.
944 if (Addr.BaseType == Address::FrameIndexBase) {
945 int FI = Addr.Base.FI;
946 int Offset = Addr.Offset;
947 MachineMemOperand *MMO =
948 FuncInfo.MF->getMachineMemOperand(
949 MachinePointerInfo::getFixedStack(FI, Offset),
951 MFI.getObjectSize(FI),
952 MFI.getObjectAlignment(FI));
953 // Now add the rest of the operands.
954 MIB.addFrameIndex(FI);
956 // ARM halfword load/stores and signed byte loads need an additional
959 signed Imm = (Addr.Offset < 0) ? (0x100 | -Addr.Offset) : Addr.Offset;
963 MIB.addImm(Addr.Offset);
965 MIB.addMemOperand(MMO);
967 // Now add the rest of the operands.
968 MIB.addReg(Addr.Base.Reg);
970 // ARM halfword load/stores and signed byte loads need an additional
973 signed Imm = (Addr.Offset < 0) ? (0x100 | -Addr.Offset) : Addr.Offset;
977 MIB.addImm(Addr.Offset);
980 AddOptionalDefs(MIB);
983 bool ARMFastISel::ARMEmitLoad(EVT VT, unsigned &ResultReg, Address &Addr,
984 unsigned Alignment, bool isZExt, bool allocReg) {
985 assert(VT.isSimple() && "Non-simple types are invalid here!");
988 bool needVMOV = false;
989 TargetRegisterClass *RC;
990 switch (VT.getSimpleVT().SimpleTy) {
991 // This is mostly going to be Neon/vector support.
992 default: return false;
996 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
997 Opc = isZExt ? ARM::t2LDRBi8 : ARM::t2LDRSBi8;
999 Opc = isZExt ? ARM::t2LDRBi12 : ARM::t2LDRSBi12;
1008 RC = ARM::GPRRegisterClass;
1012 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1013 Opc = isZExt ? ARM::t2LDRHi8 : ARM::t2LDRSHi8;
1015 Opc = isZExt ? ARM::t2LDRHi12 : ARM::t2LDRSHi12;
1017 Opc = isZExt ? ARM::LDRH : ARM::LDRSH;
1020 RC = ARM::GPRRegisterClass;
1024 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1027 Opc = ARM::t2LDRi12;
1031 RC = ARM::GPRRegisterClass;
1034 if (!Subtarget->hasVFP2()) return false;
1035 // Unaligned loads need special handling. Floats require word-alignment.
1036 if (Alignment && Alignment < 4) {
1039 Opc = isThumb2 ? ARM::t2LDRi12 : ARM::LDRi12;
1040 RC = ARM::GPRRegisterClass;
1043 RC = TLI.getRegClassFor(VT);
1047 if (!Subtarget->hasVFP2()) return false;
1048 // FIXME: Unaligned loads need special handling. Doublewords require
1050 if (Alignment && Alignment < 4)
1054 RC = TLI.getRegClassFor(VT);
1057 // Simplify this down to something we can handle.
1058 ARMSimplifyAddress(Addr, VT, useAM3);
1060 // Create the base instruction, then add the operands.
1062 ResultReg = createResultReg(RC);
1063 assert (ResultReg > 255 && "Expected an allocated virtual register.");
1064 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1065 TII.get(Opc), ResultReg);
1066 AddLoadStoreOperands(VT, Addr, MIB, MachineMemOperand::MOLoad, useAM3);
1068 // If we had an unaligned load of a float we've converted it to an regular
1069 // load. Now we must move from the GRP to the FP register.
1071 unsigned MoveReg = createResultReg(TLI.getRegClassFor(MVT::f32));
1072 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1073 TII.get(ARM::VMOVSR), MoveReg)
1074 .addReg(ResultReg));
1075 ResultReg = MoveReg;
1080 bool ARMFastISel::SelectLoad(const Instruction *I) {
1081 // Atomic loads need special handling.
1082 if (cast<LoadInst>(I)->isAtomic())
1085 // Verify we have a legal type before going any further.
1087 if (!isLoadTypeLegal(I->getType(), VT))
1090 // See if we can handle this address.
1092 if (!ARMComputeAddress(I->getOperand(0), Addr)) return false;
1095 if (!ARMEmitLoad(VT, ResultReg, Addr, cast<LoadInst>(I)->getAlignment()))
1097 UpdateValueMap(I, ResultReg);
1101 bool ARMFastISel::ARMEmitStore(EVT VT, unsigned SrcReg, Address &Addr,
1102 unsigned Alignment) {
1104 bool useAM3 = false;
1105 switch (VT.getSimpleVT().SimpleTy) {
1106 // This is mostly going to be Neon/vector support.
1107 default: return false;
1109 unsigned Res = createResultReg(isThumb2 ? ARM::tGPRRegisterClass :
1110 ARM::GPRRegisterClass);
1111 unsigned Opc = isThumb2 ? ARM::t2ANDri : ARM::ANDri;
1112 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1114 .addReg(SrcReg).addImm(1));
1116 } // Fallthrough here.
1119 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1120 StrOpc = ARM::t2STRBi8;
1122 StrOpc = ARM::t2STRBi12;
1124 StrOpc = ARM::STRBi12;
1129 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1130 StrOpc = ARM::t2STRHi8;
1132 StrOpc = ARM::t2STRHi12;
1140 if (Addr.Offset < 0 && Addr.Offset > -256 && Subtarget->hasV6T2Ops())
1141 StrOpc = ARM::t2STRi8;
1143 StrOpc = ARM::t2STRi12;
1145 StrOpc = ARM::STRi12;
1149 if (!Subtarget->hasVFP2()) return false;
1150 // Unaligned stores need special handling. Floats require word-alignment.
1151 if (Alignment && Alignment < 4) {
1152 unsigned MoveReg = createResultReg(TLI.getRegClassFor(MVT::i32));
1153 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1154 TII.get(ARM::VMOVRS), MoveReg)
1158 StrOpc = isThumb2 ? ARM::t2STRi12 : ARM::STRi12;
1160 StrOpc = ARM::VSTRS;
1164 if (!Subtarget->hasVFP2()) return false;
1165 // FIXME: Unaligned stores need special handling. Doublewords require
1167 if (Alignment && Alignment < 4)
1170 StrOpc = ARM::VSTRD;
1173 // Simplify this down to something we can handle.
1174 ARMSimplifyAddress(Addr, VT, useAM3);
1176 // Create the base instruction, then add the operands.
1177 MachineInstrBuilder MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1180 AddLoadStoreOperands(VT, Addr, MIB, MachineMemOperand::MOStore, useAM3);
1184 bool ARMFastISel::SelectStore(const Instruction *I) {
1185 Value *Op0 = I->getOperand(0);
1186 unsigned SrcReg = 0;
1188 // Atomic stores need special handling.
1189 if (cast<StoreInst>(I)->isAtomic())
1192 // Verify we have a legal type before going any further.
1194 if (!isLoadTypeLegal(I->getOperand(0)->getType(), VT))
1197 // Get the value to be stored into a register.
1198 SrcReg = getRegForValue(Op0);
1199 if (SrcReg == 0) return false;
1201 // See if we can handle this address.
1203 if (!ARMComputeAddress(I->getOperand(1), Addr))
1206 if (!ARMEmitStore(VT, SrcReg, Addr, cast<StoreInst>(I)->getAlignment()))
1211 static ARMCC::CondCodes getComparePred(CmpInst::Predicate Pred) {
1213 // Needs two compares...
1214 case CmpInst::FCMP_ONE:
1215 case CmpInst::FCMP_UEQ:
1217 // AL is our "false" for now. The other two need more compares.
1219 case CmpInst::ICMP_EQ:
1220 case CmpInst::FCMP_OEQ:
1222 case CmpInst::ICMP_SGT:
1223 case CmpInst::FCMP_OGT:
1225 case CmpInst::ICMP_SGE:
1226 case CmpInst::FCMP_OGE:
1228 case CmpInst::ICMP_UGT:
1229 case CmpInst::FCMP_UGT:
1231 case CmpInst::FCMP_OLT:
1233 case CmpInst::ICMP_ULE:
1234 case CmpInst::FCMP_OLE:
1236 case CmpInst::FCMP_ORD:
1238 case CmpInst::FCMP_UNO:
1240 case CmpInst::FCMP_UGE:
1242 case CmpInst::ICMP_SLT:
1243 case CmpInst::FCMP_ULT:
1245 case CmpInst::ICMP_SLE:
1246 case CmpInst::FCMP_ULE:
1248 case CmpInst::FCMP_UNE:
1249 case CmpInst::ICMP_NE:
1251 case CmpInst::ICMP_UGE:
1253 case CmpInst::ICMP_ULT:
1258 bool ARMFastISel::SelectBranch(const Instruction *I) {
1259 const BranchInst *BI = cast<BranchInst>(I);
1260 MachineBasicBlock *TBB = FuncInfo.MBBMap[BI->getSuccessor(0)];
1261 MachineBasicBlock *FBB = FuncInfo.MBBMap[BI->getSuccessor(1)];
1263 // Simple branch support.
1265 // If we can, avoid recomputing the compare - redoing it could lead to wonky
1267 if (const CmpInst *CI = dyn_cast<CmpInst>(BI->getCondition())) {
1268 if (CI->hasOneUse() && (CI->getParent() == I->getParent())) {
1270 // Get the compare predicate.
1271 // Try to take advantage of fallthrough opportunities.
1272 CmpInst::Predicate Predicate = CI->getPredicate();
1273 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
1274 std::swap(TBB, FBB);
1275 Predicate = CmpInst::getInversePredicate(Predicate);
1278 ARMCC::CondCodes ARMPred = getComparePred(Predicate);
1280 // We may not handle every CC for now.
1281 if (ARMPred == ARMCC::AL) return false;
1283 // Emit the compare.
1284 if (!ARMEmitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
1287 unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
1288 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
1289 .addMBB(TBB).addImm(ARMPred).addReg(ARM::CPSR);
1290 FastEmitBranch(FBB, DL);
1291 FuncInfo.MBB->addSuccessor(TBB);
1294 } else if (TruncInst *TI = dyn_cast<TruncInst>(BI->getCondition())) {
1296 if (TI->hasOneUse() && TI->getParent() == I->getParent() &&
1297 (isLoadTypeLegal(TI->getOperand(0)->getType(), SourceVT))) {
1298 unsigned TstOpc = isThumb2 ? ARM::t2TSTri : ARM::TSTri;
1299 unsigned OpReg = getRegForValue(TI->getOperand(0));
1300 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1302 .addReg(OpReg).addImm(1));
1304 unsigned CCMode = ARMCC::NE;
1305 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
1306 std::swap(TBB, FBB);
1310 unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
1311 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
1312 .addMBB(TBB).addImm(CCMode).addReg(ARM::CPSR);
1314 FastEmitBranch(FBB, DL);
1315 FuncInfo.MBB->addSuccessor(TBB);
1318 } else if (const ConstantInt *CI =
1319 dyn_cast<ConstantInt>(BI->getCondition())) {
1320 uint64_t Imm = CI->getZExtValue();
1321 MachineBasicBlock *Target = (Imm == 0) ? FBB : TBB;
1322 FastEmitBranch(Target, DL);
1326 unsigned CmpReg = getRegForValue(BI->getCondition());
1327 if (CmpReg == 0) return false;
1329 // We've been divorced from our compare! Our block was split, and
1330 // now our compare lives in a predecessor block. We musn't
1331 // re-compare here, as the children of the compare aren't guaranteed
1332 // live across the block boundary (we *could* check for this).
1333 // Regardless, the compare has been done in the predecessor block,
1334 // and it left a value for us in a virtual register. Ergo, we test
1335 // the one-bit value left in the virtual register.
1336 unsigned TstOpc = isThumb2 ? ARM::t2TSTri : ARM::TSTri;
1337 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TstOpc))
1338 .addReg(CmpReg).addImm(1));
1340 unsigned CCMode = ARMCC::NE;
1341 if (FuncInfo.MBB->isLayoutSuccessor(TBB)) {
1342 std::swap(TBB, FBB);
1346 unsigned BrOpc = isThumb2 ? ARM::t2Bcc : ARM::Bcc;
1347 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(BrOpc))
1348 .addMBB(TBB).addImm(CCMode).addReg(ARM::CPSR);
1349 FastEmitBranch(FBB, DL);
1350 FuncInfo.MBB->addSuccessor(TBB);
1354 bool ARMFastISel::ARMEmitCmp(const Value *Src1Value, const Value *Src2Value,
1356 Type *Ty = Src1Value->getType();
1357 EVT SrcVT = TLI.getValueType(Ty, true);
1358 if (!SrcVT.isSimple()) return false;
1360 bool isFloat = (Ty->isFloatTy() || Ty->isDoubleTy());
1361 if (isFloat && !Subtarget->hasVFP2())
1364 // Check to see if the 2nd operand is a constant that we can encode directly
1367 bool UseImm = false;
1368 bool isNegativeImm = false;
1369 // FIXME: At -O0 we don't have anything that canonicalizes operand order.
1370 // Thus, Src1Value may be a ConstantInt, but we're missing it.
1371 if (const ConstantInt *ConstInt = dyn_cast<ConstantInt>(Src2Value)) {
1372 if (SrcVT == MVT::i32 || SrcVT == MVT::i16 || SrcVT == MVT::i8 ||
1374 const APInt &CIVal = ConstInt->getValue();
1375 Imm = (isZExt) ? (int)CIVal.getZExtValue() : (int)CIVal.getSExtValue();
1377 isNegativeImm = true;
1380 UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
1381 (ARM_AM::getSOImmVal(Imm) != -1);
1383 } else if (const ConstantFP *ConstFP = dyn_cast<ConstantFP>(Src2Value)) {
1384 if (SrcVT == MVT::f32 || SrcVT == MVT::f64)
1385 if (ConstFP->isZero() && !ConstFP->isNegative())
1391 bool needsExt = false;
1392 switch (SrcVT.getSimpleVT().SimpleTy) {
1393 default: return false;
1394 // TODO: Verify compares.
1397 CmpOpc = UseImm ? ARM::VCMPEZS : ARM::VCMPES;
1401 CmpOpc = UseImm ? ARM::VCMPEZD : ARM::VCMPED;
1407 // Intentional fall-through.
1411 CmpOpc = ARM::t2CMPrr;
1413 CmpOpc = isNegativeImm ? ARM::t2CMNzri : ARM::t2CMPri;
1416 CmpOpc = ARM::CMPrr;
1418 CmpOpc = isNegativeImm ? ARM::CMNzri : ARM::CMPri;
1423 unsigned SrcReg1 = getRegForValue(Src1Value);
1424 if (SrcReg1 == 0) return false;
1426 unsigned SrcReg2 = 0;
1428 SrcReg2 = getRegForValue(Src2Value);
1429 if (SrcReg2 == 0) return false;
1432 // We have i1, i8, or i16, we need to either zero extend or sign extend.
1435 ResultReg = ARMEmitIntExt(SrcVT, SrcReg1, MVT::i32, isZExt);
1436 if (ResultReg == 0) return false;
1437 SrcReg1 = ResultReg;
1439 ResultReg = ARMEmitIntExt(SrcVT, SrcReg2, MVT::i32, isZExt);
1440 if (ResultReg == 0) return false;
1441 SrcReg2 = ResultReg;
1446 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1448 .addReg(SrcReg1).addReg(SrcReg2));
1450 MachineInstrBuilder MIB;
1451 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
1454 // Only add immediate for icmp as the immediate for fcmp is an implicit 0.0.
1457 AddOptionalDefs(MIB);
1460 // For floating point we need to move the result to a comparison register
1461 // that we can then use for branches.
1462 if (Ty->isFloatTy() || Ty->isDoubleTy())
1463 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1464 TII.get(ARM::FMSTAT)));
1468 bool ARMFastISel::SelectCmp(const Instruction *I) {
1469 const CmpInst *CI = cast<CmpInst>(I);
1470 Type *Ty = CI->getOperand(0)->getType();
1472 // Get the compare predicate.
1473 ARMCC::CondCodes ARMPred = getComparePred(CI->getPredicate());
1475 // We may not handle every CC for now.
1476 if (ARMPred == ARMCC::AL) return false;
1478 // Emit the compare.
1479 if (!ARMEmitCmp(CI->getOperand(0), CI->getOperand(1), CI->isUnsigned()))
1482 // Now set a register based on the comparison. Explicitly set the predicates
1484 unsigned MovCCOpc = isThumb2 ? ARM::t2MOVCCi : ARM::MOVCCi;
1485 TargetRegisterClass *RC = isThumb2 ? ARM::rGPRRegisterClass
1486 : ARM::GPRRegisterClass;
1487 unsigned DestReg = createResultReg(RC);
1488 Constant *Zero = ConstantInt::get(Type::getInt32Ty(*Context), 0);
1489 unsigned ZeroReg = TargetMaterializeConstant(Zero);
1490 bool isFloat = (Ty->isFloatTy() || Ty->isDoubleTy());
1491 unsigned CondReg = isFloat ? ARM::FPSCR : ARM::CPSR;
1492 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), DestReg)
1493 .addReg(ZeroReg).addImm(1)
1494 .addImm(ARMPred).addReg(CondReg);
1496 UpdateValueMap(I, DestReg);
1500 bool ARMFastISel::SelectFPExt(const Instruction *I) {
1501 // Make sure we have VFP and that we're extending float to double.
1502 if (!Subtarget->hasVFP2()) return false;
1504 Value *V = I->getOperand(0);
1505 if (!I->getType()->isDoubleTy() ||
1506 !V->getType()->isFloatTy()) return false;
1508 unsigned Op = getRegForValue(V);
1509 if (Op == 0) return false;
1511 unsigned Result = createResultReg(ARM::DPRRegisterClass);
1512 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1513 TII.get(ARM::VCVTDS), Result)
1515 UpdateValueMap(I, Result);
1519 bool ARMFastISel::SelectFPTrunc(const Instruction *I) {
1520 // Make sure we have VFP and that we're truncating double to float.
1521 if (!Subtarget->hasVFP2()) return false;
1523 Value *V = I->getOperand(0);
1524 if (!(I->getType()->isFloatTy() &&
1525 V->getType()->isDoubleTy())) return false;
1527 unsigned Op = getRegForValue(V);
1528 if (Op == 0) return false;
1530 unsigned Result = createResultReg(ARM::SPRRegisterClass);
1531 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1532 TII.get(ARM::VCVTSD), Result)
1534 UpdateValueMap(I, Result);
1538 bool ARMFastISel::SelectSIToFP(const Instruction *I) {
1539 // Make sure we have VFP.
1540 if (!Subtarget->hasVFP2()) return false;
1543 Type *Ty = I->getType();
1544 if (!isTypeLegal(Ty, DstVT))
1547 Value *Src = I->getOperand(0);
1548 EVT SrcVT = TLI.getValueType(Src->getType(), true);
1549 if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
1552 unsigned SrcReg = getRegForValue(Src);
1553 if (SrcReg == 0) return false;
1555 // Handle sign-extension.
1556 if (SrcVT == MVT::i16 || SrcVT == MVT::i8) {
1557 EVT DestVT = MVT::i32;
1558 unsigned ResultReg = ARMEmitIntExt(SrcVT, SrcReg, DestVT, /*isZExt*/ false);
1559 if (ResultReg == 0) return false;
1563 // The conversion routine works on fp-reg to fp-reg and the operand above
1564 // was an integer, move it to the fp registers if possible.
1565 unsigned FP = ARMMoveToFPReg(MVT::f32, SrcReg);
1566 if (FP == 0) return false;
1569 if (Ty->isFloatTy()) Opc = ARM::VSITOS;
1570 else if (Ty->isDoubleTy()) Opc = ARM::VSITOD;
1573 unsigned ResultReg = createResultReg(TLI.getRegClassFor(DstVT));
1574 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
1577 UpdateValueMap(I, ResultReg);
1581 bool ARMFastISel::SelectFPToSI(const Instruction *I) {
1582 // Make sure we have VFP.
1583 if (!Subtarget->hasVFP2()) return false;
1586 Type *RetTy = I->getType();
1587 if (!isTypeLegal(RetTy, DstVT))
1590 unsigned Op = getRegForValue(I->getOperand(0));
1591 if (Op == 0) return false;
1594 Type *OpTy = I->getOperand(0)->getType();
1595 if (OpTy->isFloatTy()) Opc = ARM::VTOSIZS;
1596 else if (OpTy->isDoubleTy()) Opc = ARM::VTOSIZD;
1599 // f64->s32 or f32->s32 both need an intermediate f32 reg.
1600 unsigned ResultReg = createResultReg(TLI.getRegClassFor(MVT::f32));
1601 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc),
1605 // This result needs to be in an integer register, but the conversion only
1606 // takes place in fp-regs.
1607 unsigned IntReg = ARMMoveToIntReg(DstVT, ResultReg);
1608 if (IntReg == 0) return false;
1610 UpdateValueMap(I, IntReg);
1614 bool ARMFastISel::SelectSelect(const Instruction *I) {
1616 if (!isTypeLegal(I->getType(), VT))
1619 // Things need to be register sized for register moves.
1620 if (VT != MVT::i32) return false;
1621 const TargetRegisterClass *RC = TLI.getRegClassFor(VT);
1623 unsigned CondReg = getRegForValue(I->getOperand(0));
1624 if (CondReg == 0) return false;
1625 unsigned Op1Reg = getRegForValue(I->getOperand(1));
1626 if (Op1Reg == 0) return false;
1628 // Check to see if we can use an immediate in the conditional move.
1630 bool UseImm = false;
1631 bool isNegativeImm = false;
1632 if (const ConstantInt *ConstInt = dyn_cast<ConstantInt>(I->getOperand(2))) {
1633 assert (VT == MVT::i32 && "Expecting an i32.");
1634 Imm = (int)ConstInt->getValue().getZExtValue();
1636 isNegativeImm = true;
1639 UseImm = isThumb2 ? (ARM_AM::getT2SOImmVal(Imm) != -1) :
1640 (ARM_AM::getSOImmVal(Imm) != -1);
1643 unsigned Op2Reg = 0;
1645 Op2Reg = getRegForValue(I->getOperand(2));
1646 if (Op2Reg == 0) return false;
1649 unsigned CmpOpc = isThumb2 ? ARM::t2CMPri : ARM::CMPri;
1650 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(CmpOpc))
1651 .addReg(CondReg).addImm(0));
1655 MovCCOpc = isThumb2 ? ARM::t2MOVCCr : ARM::MOVCCr;
1657 if (!isNegativeImm) {
1658 MovCCOpc = isThumb2 ? ARM::t2MOVCCi : ARM::MOVCCi;
1660 MovCCOpc = isThumb2 ? ARM::t2MVNCCi : ARM::MVNCCi;
1663 unsigned ResultReg = createResultReg(RC);
1665 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), ResultReg)
1666 .addReg(Op2Reg).addReg(Op1Reg).addImm(ARMCC::NE).addReg(ARM::CPSR);
1668 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(MovCCOpc), ResultReg)
1669 .addReg(Op1Reg).addImm(Imm).addImm(ARMCC::EQ).addReg(ARM::CPSR);
1670 UpdateValueMap(I, ResultReg);
1674 bool ARMFastISel::SelectSDiv(const Instruction *I) {
1676 Type *Ty = I->getType();
1677 if (!isTypeLegal(Ty, VT))
1680 // If we have integer div support we should have selected this automagically.
1681 // In case we have a real miss go ahead and return false and we'll pick
1683 if (Subtarget->hasDivide()) return false;
1685 // Otherwise emit a libcall.
1686 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1688 LC = RTLIB::SDIV_I8;
1689 else if (VT == MVT::i16)
1690 LC = RTLIB::SDIV_I16;
1691 else if (VT == MVT::i32)
1692 LC = RTLIB::SDIV_I32;
1693 else if (VT == MVT::i64)
1694 LC = RTLIB::SDIV_I64;
1695 else if (VT == MVT::i128)
1696 LC = RTLIB::SDIV_I128;
1697 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SDIV!");
1699 return ARMEmitLibcall(I, LC);
1702 bool ARMFastISel::SelectSRem(const Instruction *I) {
1704 Type *Ty = I->getType();
1705 if (!isTypeLegal(Ty, VT))
1708 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1710 LC = RTLIB::SREM_I8;
1711 else if (VT == MVT::i16)
1712 LC = RTLIB::SREM_I16;
1713 else if (VT == MVT::i32)
1714 LC = RTLIB::SREM_I32;
1715 else if (VT == MVT::i64)
1716 LC = RTLIB::SREM_I64;
1717 else if (VT == MVT::i128)
1718 LC = RTLIB::SREM_I128;
1719 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SREM!");
1721 return ARMEmitLibcall(I, LC);
1724 bool ARMFastISel::SelectBinaryOp(const Instruction *I, unsigned ISDOpcode) {
1725 EVT VT = TLI.getValueType(I->getType(), true);
1727 // We can get here in the case when we want to use NEON for our fp
1728 // operations, but can't figure out how to. Just use the vfp instructions
1730 // FIXME: It'd be nice to use NEON instructions.
1731 Type *Ty = I->getType();
1732 bool isFloat = (Ty->isDoubleTy() || Ty->isFloatTy());
1733 if (isFloat && !Subtarget->hasVFP2())
1737 bool is64bit = VT == MVT::f64 || VT == MVT::i64;
1738 switch (ISDOpcode) {
1739 default: return false;
1741 Opc = is64bit ? ARM::VADDD : ARM::VADDS;
1744 Opc = is64bit ? ARM::VSUBD : ARM::VSUBS;
1747 Opc = is64bit ? ARM::VMULD : ARM::VMULS;
1750 unsigned Op1 = getRegForValue(I->getOperand(0));
1751 if (Op1 == 0) return false;
1753 unsigned Op2 = getRegForValue(I->getOperand(1));
1754 if (Op2 == 0) return false;
1756 unsigned ResultReg = createResultReg(TLI.getRegClassFor(VT));
1757 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1758 TII.get(Opc), ResultReg)
1759 .addReg(Op1).addReg(Op2));
1760 UpdateValueMap(I, ResultReg);
1764 // Call Handling Code
1766 // This is largely taken directly from CCAssignFnForNode - we don't support
1767 // varargs in FastISel so that part has been removed.
1768 // TODO: We may not support all of this.
1769 CCAssignFn *ARMFastISel::CCAssignFnForCall(CallingConv::ID CC, bool Return) {
1772 llvm_unreachable("Unsupported calling convention");
1773 case CallingConv::Fast:
1774 // Ignore fastcc. Silence compiler warnings.
1775 (void)RetFastCC_ARM_APCS;
1776 (void)FastCC_ARM_APCS;
1778 case CallingConv::C:
1779 // Use target triple & subtarget features to do actual dispatch.
1780 if (Subtarget->isAAPCS_ABI()) {
1781 if (Subtarget->hasVFP2() &&
1782 TM.Options.FloatABIType == FloatABI::Hard)
1783 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
1785 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
1787 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
1788 case CallingConv::ARM_AAPCS_VFP:
1789 return (Return ? RetCC_ARM_AAPCS_VFP: CC_ARM_AAPCS_VFP);
1790 case CallingConv::ARM_AAPCS:
1791 return (Return ? RetCC_ARM_AAPCS: CC_ARM_AAPCS);
1792 case CallingConv::ARM_APCS:
1793 return (Return ? RetCC_ARM_APCS: CC_ARM_APCS);
1797 bool ARMFastISel::ProcessCallArgs(SmallVectorImpl<Value*> &Args,
1798 SmallVectorImpl<unsigned> &ArgRegs,
1799 SmallVectorImpl<MVT> &ArgVTs,
1800 SmallVectorImpl<ISD::ArgFlagsTy> &ArgFlags,
1801 SmallVectorImpl<unsigned> &RegArgs,
1803 unsigned &NumBytes) {
1804 SmallVector<CCValAssign, 16> ArgLocs;
1805 CCState CCInfo(CC, false, *FuncInfo.MF, TM, ArgLocs, *Context);
1806 CCInfo.AnalyzeCallOperands(ArgVTs, ArgFlags, CCAssignFnForCall(CC, false));
1808 // Get a count of how many bytes are to be pushed on the stack.
1809 NumBytes = CCInfo.getNextStackOffset();
1811 // Issue CALLSEQ_START
1812 unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
1813 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1814 TII.get(AdjStackDown))
1817 // Process the args.
1818 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1819 CCValAssign &VA = ArgLocs[i];
1820 unsigned Arg = ArgRegs[VA.getValNo()];
1821 MVT ArgVT = ArgVTs[VA.getValNo()];
1823 // We don't handle NEON/vector parameters yet.
1824 if (ArgVT.isVector() || ArgVT.getSizeInBits() > 64)
1827 // Handle arg promotion, etc.
1828 switch (VA.getLocInfo()) {
1829 case CCValAssign::Full: break;
1830 case CCValAssign::SExt: {
1831 MVT DestVT = VA.getLocVT();
1832 unsigned ResultReg = ARMEmitIntExt(ArgVT, Arg, DestVT,
1834 assert (ResultReg != 0 && "Failed to emit a sext");
1839 case CCValAssign::AExt:
1840 // Intentional fall-through. Handle AExt and ZExt.
1841 case CCValAssign::ZExt: {
1842 MVT DestVT = VA.getLocVT();
1843 unsigned ResultReg = ARMEmitIntExt(ArgVT, Arg, DestVT,
1845 assert (ResultReg != 0 && "Failed to emit a sext");
1850 case CCValAssign::BCvt: {
1851 unsigned BC = FastEmit_r(ArgVT, VA.getLocVT(), ISD::BITCAST, Arg,
1852 /*TODO: Kill=*/false);
1853 assert(BC != 0 && "Failed to emit a bitcast!");
1855 ArgVT = VA.getLocVT();
1858 default: llvm_unreachable("Unknown arg promotion!");
1861 // Now copy/store arg to correct locations.
1862 if (VA.isRegLoc() && !VA.needsCustom()) {
1863 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
1866 RegArgs.push_back(VA.getLocReg());
1867 } else if (VA.needsCustom()) {
1868 // TODO: We need custom lowering for vector (v2f64) args.
1869 if (VA.getLocVT() != MVT::f64) return false;
1871 CCValAssign &NextVA = ArgLocs[++i];
1873 // TODO: Only handle register args for now.
1874 if(!(VA.isRegLoc() && NextVA.isRegLoc())) return false;
1876 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1877 TII.get(ARM::VMOVRRD), VA.getLocReg())
1878 .addReg(NextVA.getLocReg(), RegState::Define)
1880 RegArgs.push_back(VA.getLocReg());
1881 RegArgs.push_back(NextVA.getLocReg());
1883 assert(VA.isMemLoc());
1884 // Need to store on the stack.
1886 Addr.BaseType = Address::RegBase;
1887 Addr.Base.Reg = ARM::SP;
1888 Addr.Offset = VA.getLocMemOffset();
1890 if (!ARMEmitStore(ArgVT, Arg, Addr)) return false;
1896 bool ARMFastISel::FinishCall(MVT RetVT, SmallVectorImpl<unsigned> &UsedRegs,
1897 const Instruction *I, CallingConv::ID CC,
1898 unsigned &NumBytes) {
1899 // Issue CALLSEQ_END
1900 unsigned AdjStackUp = TII.getCallFrameDestroyOpcode();
1901 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1902 TII.get(AdjStackUp))
1903 .addImm(NumBytes).addImm(0));
1905 // Now the return value.
1906 if (RetVT != MVT::isVoid) {
1907 SmallVector<CCValAssign, 16> RVLocs;
1908 CCState CCInfo(CC, false, *FuncInfo.MF, TM, RVLocs, *Context);
1909 CCInfo.AnalyzeCallResult(RetVT, CCAssignFnForCall(CC, true));
1911 // Copy all of the result registers out of their specified physreg.
1912 if (RVLocs.size() == 2 && RetVT == MVT::f64) {
1913 // For this move we copy into two registers and then move into the
1914 // double fp reg we want.
1915 EVT DestVT = RVLocs[0].getValVT();
1916 TargetRegisterClass* DstRC = TLI.getRegClassFor(DestVT);
1917 unsigned ResultReg = createResultReg(DstRC);
1918 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
1919 TII.get(ARM::VMOVDRR), ResultReg)
1920 .addReg(RVLocs[0].getLocReg())
1921 .addReg(RVLocs[1].getLocReg()));
1923 UsedRegs.push_back(RVLocs[0].getLocReg());
1924 UsedRegs.push_back(RVLocs[1].getLocReg());
1926 // Finally update the result.
1927 UpdateValueMap(I, ResultReg);
1929 assert(RVLocs.size() == 1 &&"Can't handle non-double multi-reg retvals!");
1930 EVT CopyVT = RVLocs[0].getValVT();
1932 // Special handling for extended integers.
1933 if (RetVT == MVT::i1 || RetVT == MVT::i8 || RetVT == MVT::i16)
1936 TargetRegisterClass* DstRC = TLI.getRegClassFor(CopyVT);
1938 unsigned ResultReg = createResultReg(DstRC);
1939 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
1940 ResultReg).addReg(RVLocs[0].getLocReg());
1941 UsedRegs.push_back(RVLocs[0].getLocReg());
1943 // Finally update the result.
1944 UpdateValueMap(I, ResultReg);
1951 bool ARMFastISel::SelectRet(const Instruction *I) {
1952 const ReturnInst *Ret = cast<ReturnInst>(I);
1953 const Function &F = *I->getParent()->getParent();
1955 if (!FuncInfo.CanLowerReturn)
1961 CallingConv::ID CC = F.getCallingConv();
1962 if (Ret->getNumOperands() > 0) {
1963 SmallVector<ISD::OutputArg, 4> Outs;
1964 GetReturnInfo(F.getReturnType(), F.getAttributes().getRetAttributes(),
1967 // Analyze operands of the call, assigning locations to each operand.
1968 SmallVector<CCValAssign, 16> ValLocs;
1969 CCState CCInfo(CC, F.isVarArg(), *FuncInfo.MF, TM, ValLocs,I->getContext());
1970 CCInfo.AnalyzeReturn(Outs, CCAssignFnForCall(CC, true /* is Ret */));
1972 const Value *RV = Ret->getOperand(0);
1973 unsigned Reg = getRegForValue(RV);
1977 // Only handle a single return value for now.
1978 if (ValLocs.size() != 1)
1981 CCValAssign &VA = ValLocs[0];
1983 // Don't bother handling odd stuff for now.
1984 if (VA.getLocInfo() != CCValAssign::Full)
1986 // Only handle register returns for now.
1990 unsigned SrcReg = Reg + VA.getValNo();
1991 EVT RVVT = TLI.getValueType(RV->getType());
1992 EVT DestVT = VA.getValVT();
1993 // Special handling for extended integers.
1994 if (RVVT != DestVT) {
1995 if (RVVT != MVT::i1 && RVVT != MVT::i8 && RVVT != MVT::i16)
1998 if (!Outs[0].Flags.isZExt() && !Outs[0].Flags.isSExt())
2001 assert(DestVT == MVT::i32 && "ARM should always ext to i32");
2003 bool isZExt = Outs[0].Flags.isZExt();
2004 unsigned ResultReg = ARMEmitIntExt(RVVT, SrcReg, DestVT, isZExt);
2005 if (ResultReg == 0) return false;
2010 unsigned DstReg = VA.getLocReg();
2011 const TargetRegisterClass* SrcRC = MRI.getRegClass(SrcReg);
2012 // Avoid a cross-class copy. This is very unlikely.
2013 if (!SrcRC->contains(DstReg))
2015 BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(TargetOpcode::COPY),
2016 DstReg).addReg(SrcReg);
2018 // Mark the register as live out of the function.
2019 MRI.addLiveOut(VA.getLocReg());
2022 unsigned RetOpc = isThumb2 ? ARM::tBX_RET : ARM::BX_RET;
2023 AddOptionalDefs(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2028 unsigned ARMFastISel::ARMSelectCallOp(const GlobalValue *GV) {
2030 // iOS needs the r9 versions of the opcodes.
2031 bool isiOS = Subtarget->isTargetIOS();
2033 return isiOS ? ARM::tBLr9 : ARM::tBL;
2035 return isiOS ? ARM::BLr9 : ARM::BL;
2039 // A quick function that will emit a call for a named libcall in F with the
2040 // vector of passed arguments for the Instruction in I. We can assume that we
2041 // can emit a call for any libcall we can produce. This is an abridged version
2042 // of the full call infrastructure since we won't need to worry about things
2043 // like computed function pointers or strange arguments at call sites.
2044 // TODO: Try to unify this and the normal call bits for ARM, then try to unify
2046 bool ARMFastISel::ARMEmitLibcall(const Instruction *I, RTLIB::Libcall Call) {
2047 CallingConv::ID CC = TLI.getLibcallCallingConv(Call);
2049 // Handle *simple* calls for now.
2050 Type *RetTy = I->getType();
2052 if (RetTy->isVoidTy())
2053 RetVT = MVT::isVoid;
2054 else if (!isTypeLegal(RetTy, RetVT))
2057 // TODO: For now if we have long calls specified we don't handle the call.
2058 if (EnableARMLongCalls) return false;
2060 // Set up the argument vectors.
2061 SmallVector<Value*, 8> Args;
2062 SmallVector<unsigned, 8> ArgRegs;
2063 SmallVector<MVT, 8> ArgVTs;
2064 SmallVector<ISD::ArgFlagsTy, 8> ArgFlags;
2065 Args.reserve(I->getNumOperands());
2066 ArgRegs.reserve(I->getNumOperands());
2067 ArgVTs.reserve(I->getNumOperands());
2068 ArgFlags.reserve(I->getNumOperands());
2069 for (unsigned i = 0; i < I->getNumOperands(); ++i) {
2070 Value *Op = I->getOperand(i);
2071 unsigned Arg = getRegForValue(Op);
2072 if (Arg == 0) return false;
2074 Type *ArgTy = Op->getType();
2076 if (!isTypeLegal(ArgTy, ArgVT)) return false;
2078 ISD::ArgFlagsTy Flags;
2079 unsigned OriginalAlignment = TD.getABITypeAlignment(ArgTy);
2080 Flags.setOrigAlign(OriginalAlignment);
2083 ArgRegs.push_back(Arg);
2084 ArgVTs.push_back(ArgVT);
2085 ArgFlags.push_back(Flags);
2088 // Handle the arguments now that we've gotten them.
2089 SmallVector<unsigned, 4> RegArgs;
2091 if (!ProcessCallArgs(Args, ArgRegs, ArgVTs, ArgFlags, RegArgs, CC, NumBytes))
2094 // Issue the call, BLr9 for iOS, BL otherwise.
2095 // TODO: Turn this into the table of arm call ops.
2096 MachineInstrBuilder MIB;
2097 unsigned CallOpc = ARMSelectCallOp(NULL);
2099 // Explicitly adding the predicate here.
2100 MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2102 .addExternalSymbol(TLI.getLibcallName(Call));
2104 // Explicitly adding the predicate here.
2105 MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2107 .addExternalSymbol(TLI.getLibcallName(Call)));
2109 // Add implicit physical register uses to the call.
2110 for (unsigned i = 0, e = RegArgs.size(); i != e; ++i)
2111 MIB.addReg(RegArgs[i]);
2113 // Finish off the call including any return values.
2114 SmallVector<unsigned, 4> UsedRegs;
2115 if (!FinishCall(RetVT, UsedRegs, I, CC, NumBytes)) return false;
2117 // Set all unused physreg defs as dead.
2118 static_cast<MachineInstr *>(MIB)->setPhysRegsDeadExcept(UsedRegs, TRI);
2123 bool ARMFastISel::SelectCall(const Instruction *I,
2124 const char *IntrMemName = 0) {
2125 const CallInst *CI = cast<CallInst>(I);
2126 const Value *Callee = CI->getCalledValue();
2128 // Can't handle inline asm.
2129 if (isa<InlineAsm>(Callee)) return false;
2131 // Only handle global variable Callees.
2132 const GlobalValue *GV = dyn_cast<GlobalValue>(Callee);
2136 // Check the calling convention.
2137 ImmutableCallSite CS(CI);
2138 CallingConv::ID CC = CS.getCallingConv();
2140 // TODO: Avoid some calling conventions?
2142 // Let SDISel handle vararg functions.
2143 PointerType *PT = cast<PointerType>(CS.getCalledValue()->getType());
2144 FunctionType *FTy = cast<FunctionType>(PT->getElementType());
2145 if (FTy->isVarArg())
2148 // Handle *simple* calls for now.
2149 Type *RetTy = I->getType();
2151 if (RetTy->isVoidTy())
2152 RetVT = MVT::isVoid;
2153 else if (!isTypeLegal(RetTy, RetVT) && RetVT != MVT::i16 &&
2154 RetVT != MVT::i8 && RetVT != MVT::i1)
2157 // TODO: For now if we have long calls specified we don't handle the call.
2158 if (EnableARMLongCalls) return false;
2160 // Set up the argument vectors.
2161 SmallVector<Value*, 8> Args;
2162 SmallVector<unsigned, 8> ArgRegs;
2163 SmallVector<MVT, 8> ArgVTs;
2164 SmallVector<ISD::ArgFlagsTy, 8> ArgFlags;
2165 Args.reserve(CS.arg_size());
2166 ArgRegs.reserve(CS.arg_size());
2167 ArgVTs.reserve(CS.arg_size());
2168 ArgFlags.reserve(CS.arg_size());
2169 for (ImmutableCallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
2171 // If we're lowering a memory intrinsic instead of a regular call, skip the
2172 // last two arguments, which shouldn't be passed to the underlying function.
2173 if (IntrMemName && e-i <= 2)
2176 ISD::ArgFlagsTy Flags;
2177 unsigned AttrInd = i - CS.arg_begin() + 1;
2178 if (CS.paramHasAttr(AttrInd, Attribute::SExt))
2180 if (CS.paramHasAttr(AttrInd, Attribute::ZExt))
2183 // FIXME: Only handle *easy* calls for now.
2184 if (CS.paramHasAttr(AttrInd, Attribute::InReg) ||
2185 CS.paramHasAttr(AttrInd, Attribute::StructRet) ||
2186 CS.paramHasAttr(AttrInd, Attribute::Nest) ||
2187 CS.paramHasAttr(AttrInd, Attribute::ByVal))
2190 Type *ArgTy = (*i)->getType();
2192 if (!isTypeLegal(ArgTy, ArgVT) && ArgVT != MVT::i16 && ArgVT != MVT::i8 &&
2196 unsigned Arg = getRegForValue(*i);
2200 unsigned OriginalAlignment = TD.getABITypeAlignment(ArgTy);
2201 Flags.setOrigAlign(OriginalAlignment);
2204 ArgRegs.push_back(Arg);
2205 ArgVTs.push_back(ArgVT);
2206 ArgFlags.push_back(Flags);
2209 // Handle the arguments now that we've gotten them.
2210 SmallVector<unsigned, 4> RegArgs;
2212 if (!ProcessCallArgs(Args, ArgRegs, ArgVTs, ArgFlags, RegArgs, CC, NumBytes))
2215 // Issue the call, BLr9 for iOS, BL otherwise.
2216 // TODO: Turn this into the table of arm call ops.
2217 MachineInstrBuilder MIB;
2218 unsigned CallOpc = ARMSelectCallOp(GV);
2219 // Explicitly adding the predicate here.
2221 // Explicitly adding the predicate here.
2222 MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2225 MIB.addGlobalAddress(GV, 0, 0);
2227 MIB.addExternalSymbol(IntrMemName, 0);
2230 // Explicitly adding the predicate here.
2231 MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2233 .addGlobalAddress(GV, 0, 0));
2235 MIB = AddDefaultPred(BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL,
2237 .addExternalSymbol(IntrMemName, 0));
2240 // Add implicit physical register uses to the call.
2241 for (unsigned i = 0, e = RegArgs.size(); i != e; ++i)
2242 MIB.addReg(RegArgs[i]);
2244 // Finish off the call including any return values.
2245 SmallVector<unsigned, 4> UsedRegs;
2246 if (!FinishCall(RetVT, UsedRegs, I, CC, NumBytes)) return false;
2248 // Set all unused physreg defs as dead.
2249 static_cast<MachineInstr *>(MIB)->setPhysRegsDeadExcept(UsedRegs, TRI);
2254 bool ARMFastISel::ARMIsMemCpySmall(uint64_t Len) {
2258 bool ARMFastISel::ARMTryEmitSmallMemCpy(Address Dest, Address Src, uint64_t Len) {
2259 // Make sure we don't bloat code by inlining very large memcpy's.
2260 if (!ARMIsMemCpySmall(Len))
2263 // We don't care about alignment here since we just emit integer accesses.
2277 RV = ARMEmitLoad(VT, ResultReg, Src);
2278 assert (RV == true && "Should be able to handle this load.");
2279 RV = ARMEmitStore(VT, ResultReg, Dest);
2280 assert (RV == true && "Should be able to handle this store.");
2282 unsigned Size = VT.getSizeInBits()/8;
2284 Dest.Offset += Size;
2291 bool ARMFastISel::SelectIntrinsicCall(const IntrinsicInst &I) {
2292 // FIXME: Handle more intrinsics.
2293 switch (I.getIntrinsicID()) {
2294 default: return false;
2295 case Intrinsic::memcpy:
2296 case Intrinsic::memmove: {
2297 const MemTransferInst &MTI = cast<MemTransferInst>(I);
2298 // Don't handle volatile.
2299 if (MTI.isVolatile())
2302 // Disable inlining for memmove before calls to ComputeAddress. Otherwise,
2303 // we would emit dead code because we don't currently handle memmoves.
2304 bool isMemCpy = (I.getIntrinsicID() == Intrinsic::memcpy);
2305 if (isa<ConstantInt>(MTI.getLength()) && isMemCpy) {
2306 // Small memcpy's are common enough that we want to do them without a call
2308 uint64_t Len = cast<ConstantInt>(MTI.getLength())->getZExtValue();
2309 if (ARMIsMemCpySmall(Len)) {
2311 if (!ARMComputeAddress(MTI.getRawDest(), Dest) ||
2312 !ARMComputeAddress(MTI.getRawSource(), Src))
2314 if (ARMTryEmitSmallMemCpy(Dest, Src, Len))
2319 if (!MTI.getLength()->getType()->isIntegerTy(32))
2322 if (MTI.getSourceAddressSpace() > 255 || MTI.getDestAddressSpace() > 255)
2325 const char *IntrMemName = isa<MemCpyInst>(I) ? "memcpy" : "memmove";
2326 return SelectCall(&I, IntrMemName);
2328 case Intrinsic::memset: {
2329 const MemSetInst &MSI = cast<MemSetInst>(I);
2330 // Don't handle volatile.
2331 if (MSI.isVolatile())
2334 if (!MSI.getLength()->getType()->isIntegerTy(32))
2337 if (MSI.getDestAddressSpace() > 255)
2340 return SelectCall(&I, "memset");
2346 bool ARMFastISel::SelectTrunc(const Instruction *I) {
2347 // The high bits for a type smaller than the register size are assumed to be
2349 Value *Op = I->getOperand(0);
2352 SrcVT = TLI.getValueType(Op->getType(), true);
2353 DestVT = TLI.getValueType(I->getType(), true);
2355 if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
2357 if (DestVT != MVT::i16 && DestVT != MVT::i8 && DestVT != MVT::i1)
2360 unsigned SrcReg = getRegForValue(Op);
2361 if (!SrcReg) return false;
2363 // Because the high bits are undefined, a truncate doesn't generate
2365 UpdateValueMap(I, SrcReg);
2369 unsigned ARMFastISel::ARMEmitIntExt(EVT SrcVT, unsigned SrcReg, EVT DestVT,
2371 if (DestVT != MVT::i32 && DestVT != MVT::i16 && DestVT != MVT::i8)
2375 bool isBoolZext = false;
2376 if (!SrcVT.isSimple()) return 0;
2377 switch (SrcVT.getSimpleVT().SimpleTy) {
2380 if (!Subtarget->hasV6Ops()) return 0;
2382 Opc = isThumb2 ? ARM::t2UXTH : ARM::UXTH;
2384 Opc = isThumb2 ? ARM::t2SXTH : ARM::SXTH;
2387 if (!Subtarget->hasV6Ops()) return 0;
2389 Opc = isThumb2 ? ARM::t2UXTB : ARM::UXTB;
2391 Opc = isThumb2 ? ARM::t2SXTB : ARM::SXTB;
2395 Opc = isThumb2 ? ARM::t2ANDri : ARM::ANDri;
2402 unsigned ResultReg = createResultReg(TLI.getRegClassFor(MVT::i32));
2403 MachineInstrBuilder MIB;
2404 MIB = BuildMI(*FuncInfo.MBB, FuncInfo.InsertPt, DL, TII.get(Opc), ResultReg)
2410 AddOptionalDefs(MIB);
2414 bool ARMFastISel::SelectIntExt(const Instruction *I) {
2415 // On ARM, in general, integer casts don't involve legal types; this code
2416 // handles promotable integers.
2417 Type *DestTy = I->getType();
2418 Value *Src = I->getOperand(0);
2419 Type *SrcTy = Src->getType();
2422 SrcVT = TLI.getValueType(SrcTy, true);
2423 DestVT = TLI.getValueType(DestTy, true);
2425 bool isZExt = isa<ZExtInst>(I);
2426 unsigned SrcReg = getRegForValue(Src);
2427 if (!SrcReg) return false;
2429 unsigned ResultReg = ARMEmitIntExt(SrcVT, SrcReg, DestVT, isZExt);
2430 if (ResultReg == 0) return false;
2431 UpdateValueMap(I, ResultReg);
2435 // TODO: SoftFP support.
2436 bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
2438 switch (I->getOpcode()) {
2439 case Instruction::Load:
2440 return SelectLoad(I);
2441 case Instruction::Store:
2442 return SelectStore(I);
2443 case Instruction::Br:
2444 return SelectBranch(I);
2445 case Instruction::ICmp:
2446 case Instruction::FCmp:
2447 return SelectCmp(I);
2448 case Instruction::FPExt:
2449 return SelectFPExt(I);
2450 case Instruction::FPTrunc:
2451 return SelectFPTrunc(I);
2452 case Instruction::SIToFP:
2453 return SelectSIToFP(I);
2454 case Instruction::FPToSI:
2455 return SelectFPToSI(I);
2456 case Instruction::FAdd:
2457 return SelectBinaryOp(I, ISD::FADD);
2458 case Instruction::FSub:
2459 return SelectBinaryOp(I, ISD::FSUB);
2460 case Instruction::FMul:
2461 return SelectBinaryOp(I, ISD::FMUL);
2462 case Instruction::SDiv:
2463 return SelectSDiv(I);
2464 case Instruction::SRem:
2465 return SelectSRem(I);
2466 case Instruction::Call:
2467 if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(I))
2468 return SelectIntrinsicCall(*II);
2469 return SelectCall(I);
2470 case Instruction::Select:
2471 return SelectSelect(I);
2472 case Instruction::Ret:
2473 return SelectRet(I);
2474 case Instruction::Trunc:
2475 return SelectTrunc(I);
2476 case Instruction::ZExt:
2477 case Instruction::SExt:
2478 return SelectIntExt(I);
2484 /// TryToFoldLoad - The specified machine instr operand is a vreg, and that
2485 /// vreg is being provided by the specified load instruction. If possible,
2486 /// try to fold the load as an operand to the instruction, returning true if
2488 bool ARMFastISel::TryToFoldLoad(MachineInstr *MI, unsigned OpNo,
2489 const LoadInst *LI) {
2490 // Verify we have a legal type before going any further.
2492 if (!isLoadTypeLegal(LI->getType(), VT))
2495 // Combine load followed by zero- or sign-extend.
2496 // ldrb r1, [r0] ldrb r1, [r0]
2498 // mov r3, r2 mov r3, r1
2500 switch(MI->getOpcode()) {
2501 default: return false;
2519 // See if we can handle this address.
2521 if (!ARMComputeAddress(LI->getOperand(0), Addr)) return false;
2523 unsigned ResultReg = MI->getOperand(0).getReg();
2524 if (!ARMEmitLoad(VT, ResultReg, Addr, LI->getAlignment(), isZExt, false))
2526 MI->eraseFromParent();
2531 llvm::FastISel *ARM::createFastISel(FunctionLoweringInfo &funcInfo) {
2532 // Completely untested on non-iOS.
2533 const TargetMachine &TM = funcInfo.MF->getTarget();
2535 // Darwin and thumb1 only for now.
2536 const ARMSubtarget *Subtarget = &TM.getSubtarget<ARMSubtarget>();
2537 if (Subtarget->isTargetIOS() && !Subtarget->isThumb1Only() &&
2538 !DisableARMFastISel)
2539 return new ARMFastISel(funcInfo);