1 //===- ARMBaseInstrInfo.cpp - ARM Instruction Information -----------*- C++ -*-===//
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 contains the Base ARM implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "ARMBaseInstrInfo.h"
16 #include "ARMAddressingModes.h"
17 #include "ARMGenInstrInfo.inc"
18 #include "ARMMachineFunctionInfo.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/CodeGen/LiveVariables.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineInstrBuilder.h"
23 #include "llvm/CodeGen/MachineJumpTableInfo.h"
24 #include "llvm/Target/TargetAsmInfo.h"
25 #include "llvm/Support/CommandLine.h"
26 #include "llvm/Support/ErrorHandling.h"
30 EnableARM3Addr("enable-arm-3-addr-conv", cl::Hidden,
31 cl::desc("Enable ARM 2-addr to 3-addr conv"));
33 ARMBaseInstrInfo::ARMBaseInstrInfo(const ARMSubtarget &STI)
34 : TargetInstrInfoImpl(ARMInsts, array_lengthof(ARMInsts)) {
38 ARMBaseInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
39 MachineBasicBlock::iterator &MBBI,
40 LiveVariables *LV) const {
44 MachineInstr *MI = MBBI;
45 MachineFunction &MF = *MI->getParent()->getParent();
46 unsigned TSFlags = MI->getDesc().TSFlags;
48 switch ((TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift) {
50 case ARMII::IndexModePre:
53 case ARMII::IndexModePost:
57 // Try splitting an indexed load/store to an un-indexed one plus an add/sub
59 unsigned MemOpc = getUnindexedOpcode(MI->getOpcode());
63 MachineInstr *UpdateMI = NULL;
64 MachineInstr *MemMI = NULL;
65 unsigned AddrMode = (TSFlags & ARMII::AddrModeMask);
66 const TargetInstrDesc &TID = MI->getDesc();
67 unsigned NumOps = TID.getNumOperands();
68 bool isLoad = !TID.mayStore();
69 const MachineOperand &WB = isLoad ? MI->getOperand(1) : MI->getOperand(0);
70 const MachineOperand &Base = MI->getOperand(2);
71 const MachineOperand &Offset = MI->getOperand(NumOps-3);
72 unsigned WBReg = WB.getReg();
73 unsigned BaseReg = Base.getReg();
74 unsigned OffReg = Offset.getReg();
75 unsigned OffImm = MI->getOperand(NumOps-2).getImm();
76 ARMCC::CondCodes Pred = (ARMCC::CondCodes)MI->getOperand(NumOps-1).getImm();
79 assert(false && "Unknown indexed op!");
81 case ARMII::AddrMode2: {
82 bool isSub = ARM_AM::getAM2Op(OffImm) == ARM_AM::sub;
83 unsigned Amt = ARM_AM::getAM2Offset(OffImm);
85 if (ARM_AM::getSOImmVal(Amt) == -1)
86 // Can't encode it in a so_imm operand. This transformation will
87 // add more than 1 instruction. Abandon!
89 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
90 get(isSub ? getOpcode(ARMII::SUBri) :
91 getOpcode(ARMII::ADDri)), WBReg)
92 .addReg(BaseReg).addImm(Amt)
93 .addImm(Pred).addReg(0).addReg(0);
94 } else if (Amt != 0) {
95 ARM_AM::ShiftOpc ShOpc = ARM_AM::getAM2ShiftOpc(OffImm);
96 unsigned SOOpc = ARM_AM::getSORegOpc(ShOpc, Amt);
97 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
98 get(isSub ? getOpcode(ARMII::SUBrs) :
99 getOpcode(ARMII::ADDrs)), WBReg)
100 .addReg(BaseReg).addReg(OffReg).addReg(0).addImm(SOOpc)
101 .addImm(Pred).addReg(0).addReg(0);
103 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
104 get(isSub ? getOpcode(ARMII::SUBrr) :
105 getOpcode(ARMII::ADDrr)), WBReg)
106 .addReg(BaseReg).addReg(OffReg)
107 .addImm(Pred).addReg(0).addReg(0);
110 case ARMII::AddrMode3 : {
111 bool isSub = ARM_AM::getAM3Op(OffImm) == ARM_AM::sub;
112 unsigned Amt = ARM_AM::getAM3Offset(OffImm);
114 // Immediate is 8-bits. It's guaranteed to fit in a so_imm operand.
115 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
116 get(isSub ? getOpcode(ARMII::SUBri) :
117 getOpcode(ARMII::ADDri)), WBReg)
118 .addReg(BaseReg).addImm(Amt)
119 .addImm(Pred).addReg(0).addReg(0);
121 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
122 get(isSub ? getOpcode(ARMII::SUBrr) :
123 getOpcode(ARMII::ADDrr)), WBReg)
124 .addReg(BaseReg).addReg(OffReg)
125 .addImm(Pred).addReg(0).addReg(0);
130 std::vector<MachineInstr*> NewMIs;
133 MemMI = BuildMI(MF, MI->getDebugLoc(),
134 get(MemOpc), MI->getOperand(0).getReg())
135 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
137 MemMI = BuildMI(MF, MI->getDebugLoc(),
138 get(MemOpc)).addReg(MI->getOperand(1).getReg())
139 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
140 NewMIs.push_back(MemMI);
141 NewMIs.push_back(UpdateMI);
144 MemMI = BuildMI(MF, MI->getDebugLoc(),
145 get(MemOpc), MI->getOperand(0).getReg())
146 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
148 MemMI = BuildMI(MF, MI->getDebugLoc(),
149 get(MemOpc)).addReg(MI->getOperand(1).getReg())
150 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
152 UpdateMI->getOperand(0).setIsDead();
153 NewMIs.push_back(UpdateMI);
154 NewMIs.push_back(MemMI);
157 // Transfer LiveVariables states, kill / dead info.
159 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
160 MachineOperand &MO = MI->getOperand(i);
161 if (MO.isReg() && MO.getReg() &&
162 TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
163 unsigned Reg = MO.getReg();
165 LiveVariables::VarInfo &VI = LV->getVarInfo(Reg);
167 MachineInstr *NewMI = (Reg == WBReg) ? UpdateMI : MemMI;
169 LV->addVirtualRegisterDead(Reg, NewMI);
171 if (MO.isUse() && MO.isKill()) {
172 for (unsigned j = 0; j < 2; ++j) {
173 // Look at the two new MI's in reverse order.
174 MachineInstr *NewMI = NewMIs[j];
175 if (!NewMI->readsRegister(Reg))
177 LV->addVirtualRegisterKilled(Reg, NewMI);
178 if (VI.removeKill(MI))
179 VI.Kills.push_back(NewMI);
187 MFI->insert(MBBI, NewMIs[1]);
188 MFI->insert(MBBI, NewMIs[0]);
194 ARMBaseInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
195 MachineBasicBlock *&FBB,
196 SmallVectorImpl<MachineOperand> &Cond,
197 bool AllowModify) const {
198 // If the block has no terminators, it just falls into the block after it.
199 MachineBasicBlock::iterator I = MBB.end();
200 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
203 // Get the last instruction in the block.
204 MachineInstr *LastInst = I;
206 // If there is only one terminator instruction, process it.
207 unsigned LastOpc = LastInst->getOpcode();
208 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
209 if (LastOpc == getOpcode(ARMII::B)) {
210 TBB = LastInst->getOperand(0).getMBB();
213 if (LastOpc == getOpcode(ARMII::Bcc)) {
214 // Block ends with fall-through condbranch.
215 TBB = LastInst->getOperand(0).getMBB();
216 Cond.push_back(LastInst->getOperand(1));
217 Cond.push_back(LastInst->getOperand(2));
220 return true; // Can't handle indirect branch.
223 // Get the instruction before it if it is a terminator.
224 MachineInstr *SecondLastInst = I;
226 // If there are three terminators, we don't know what sort of block this is.
227 if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
230 // If the block ends with ARMII::B and a ARMII::Bcc, handle it.
231 unsigned SecondLastOpc = SecondLastInst->getOpcode();
232 if ((SecondLastOpc == getOpcode(ARMII::Bcc)) &&
233 (LastOpc == getOpcode(ARMII::B))) {
234 TBB = SecondLastInst->getOperand(0).getMBB();
235 Cond.push_back(SecondLastInst->getOperand(1));
236 Cond.push_back(SecondLastInst->getOperand(2));
237 FBB = LastInst->getOperand(0).getMBB();
241 // If the block ends with two unconditional branches, handle it. The second
242 // one is not executed, so remove it.
243 if ((SecondLastOpc == getOpcode(ARMII::B)) &&
244 (LastOpc == getOpcode(ARMII::B))) {
245 TBB = SecondLastInst->getOperand(0).getMBB();
248 I->eraseFromParent();
252 // ...likewise if it ends with a branch table followed by an unconditional
253 // branch. The branch folder can create these, and we must get rid of them for
254 // correctness of Thumb constant islands.
255 if ((SecondLastOpc == ARM::BR_JTr ||
256 SecondLastOpc == ARM::BR_JTm ||
257 SecondLastOpc == ARM::BR_JTadd ||
258 SecondLastOpc == ARM::tBR_JTr ||
259 SecondLastOpc == ARM::t2BR_JT) &&
260 (LastOpc == getOpcode(ARMII::B))) {
263 I->eraseFromParent();
267 // Otherwise, can't handle this.
272 unsigned ARMBaseInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
273 int BOpc = getOpcode(ARMII::B);
274 int BccOpc = getOpcode(ARMII::Bcc);
276 MachineBasicBlock::iterator I = MBB.end();
277 if (I == MBB.begin()) return 0;
279 if (I->getOpcode() != BOpc && I->getOpcode() != BccOpc)
282 // Remove the branch.
283 I->eraseFromParent();
287 if (I == MBB.begin()) return 1;
289 if (I->getOpcode() != BccOpc)
292 // Remove the branch.
293 I->eraseFromParent();
298 ARMBaseInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
299 MachineBasicBlock *FBB,
300 const SmallVectorImpl<MachineOperand> &Cond) const {
301 // FIXME this should probably have a DebugLoc argument
302 DebugLoc dl = DebugLoc::getUnknownLoc();
303 int BOpc = getOpcode(ARMII::B);
304 int BccOpc = getOpcode(ARMII::Bcc);
306 // Shouldn't be a fall through.
307 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
308 assert((Cond.size() == 2 || Cond.size() == 0) &&
309 "ARM branch conditions have two components!");
312 if (Cond.empty()) // Unconditional branch?
313 BuildMI(&MBB, dl, get(BOpc)).addMBB(TBB);
315 BuildMI(&MBB, dl, get(BccOpc)).addMBB(TBB)
316 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
320 // Two-way conditional branch.
321 BuildMI(&MBB, dl, get(BccOpc)).addMBB(TBB)
322 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
323 BuildMI(&MBB, dl, get(BOpc)).addMBB(FBB);
327 bool ARMBaseInstrInfo::
328 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
329 ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm();
330 Cond[0].setImm(ARMCC::getOppositeCondition(CC));
334 bool ARMBaseInstrInfo::
335 PredicateInstruction(MachineInstr *MI,
336 const SmallVectorImpl<MachineOperand> &Pred) const {
337 unsigned Opc = MI->getOpcode();
338 if (Opc == getOpcode(ARMII::B)) {
339 MI->setDesc(get(getOpcode(ARMII::Bcc)));
340 MI->addOperand(MachineOperand::CreateImm(Pred[0].getImm()));
341 MI->addOperand(MachineOperand::CreateReg(Pred[1].getReg(), false));
345 int PIdx = MI->findFirstPredOperandIdx();
347 MachineOperand &PMO = MI->getOperand(PIdx);
348 PMO.setImm(Pred[0].getImm());
349 MI->getOperand(PIdx+1).setReg(Pred[1].getReg());
355 bool ARMBaseInstrInfo::
356 SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
357 const SmallVectorImpl<MachineOperand> &Pred2) const {
358 if (Pred1.size() > 2 || Pred2.size() > 2)
361 ARMCC::CondCodes CC1 = (ARMCC::CondCodes)Pred1[0].getImm();
362 ARMCC::CondCodes CC2 = (ARMCC::CondCodes)Pred2[0].getImm();
372 return CC2 == ARMCC::HI;
374 return CC2 == ARMCC::LO || CC2 == ARMCC::EQ;
376 return CC2 == ARMCC::GT;
378 return CC2 == ARMCC::LT;
382 bool ARMBaseInstrInfo::DefinesPredicate(MachineInstr *MI,
383 std::vector<MachineOperand> &Pred) const {
384 const TargetInstrDesc &TID = MI->getDesc();
385 if (!TID.getImplicitDefs() && !TID.hasOptionalDef())
389 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
390 const MachineOperand &MO = MI->getOperand(i);
391 if (MO.isReg() && MO.getReg() == ARM::CPSR) {
401 /// FIXME: Works around a gcc miscompilation with -fstrict-aliasing
402 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
403 unsigned JTI) DISABLE_INLINE;
404 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
406 return JT[JTI].MBBs.size();
409 /// GetInstSize - Return the size of the specified MachineInstr.
411 unsigned ARMBaseInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
412 const MachineBasicBlock &MBB = *MI->getParent();
413 const MachineFunction *MF = MBB.getParent();
414 const TargetAsmInfo *TAI = MF->getTarget().getTargetAsmInfo();
416 // Basic size info comes from the TSFlags field.
417 const TargetInstrDesc &TID = MI->getDesc();
418 unsigned TSFlags = TID.TSFlags;
420 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
422 // If this machine instr is an inline asm, measure it.
423 if (MI->getOpcode() == ARM::INLINEASM)
424 return TAI->getInlineAsmLength(MI->getOperand(0).getSymbolName());
427 switch (MI->getOpcode()) {
429 llvm_unreachable("Unknown or unset size field for instr!");
430 case TargetInstrInfo::IMPLICIT_DEF:
431 case TargetInstrInfo::DECLARE:
432 case TargetInstrInfo::DBG_LABEL:
433 case TargetInstrInfo::EH_LABEL:
438 case ARMII::Size8Bytes: return 8; // ARM instruction x 2.
439 case ARMII::Size4Bytes: return 4; // ARM / Thumb2 instruction.
440 case ARMII::Size2Bytes: return 2; // Thumb1 instruction.
441 case ARMII::SizeSpecial: {
442 bool IsThumb1JT = false;
443 switch (MI->getOpcode()) {
444 case ARM::CONSTPOOL_ENTRY:
445 // If this machine instr is a constant pool entry, its size is recorded as
447 return MI->getOperand(2).getImm();
448 case ARM::Int_eh_sjlj_setjmp:
457 // These are jumptable branches, i.e. a branch followed by an inlined
458 // jumptable. The size is 4 + 4 * number of entries.
459 unsigned NumOps = TID.getNumOperands();
460 MachineOperand JTOP =
461 MI->getOperand(NumOps - (TID.isPredicable() ? 3 : 2));
462 unsigned JTI = JTOP.getIndex();
463 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
464 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
465 assert(JTI < JT.size());
466 // Thumb instructions are 2 byte aligned, but JT entries are 4 byte
467 // 4 aligned. The assembler / linker may add 2 byte padding just before
468 // the JT entries. The size does not include this padding; the
469 // constant islands pass does separate bookkeeping for it.
470 // FIXME: If we know the size of the function is less than (1 << 16) *2
471 // bytes, we can use 16-bit entries instead. Then there won't be an
473 return getNumJTEntries(JT, JTI) * 4 + (IsThumb1JT ? 2 : 4);
476 // Otherwise, pseudo-instruction sizes are zero.
481 return 0; // Not reached
484 /// Return true if the instruction is a register to register move and
485 /// leave the source and dest operands in the passed parameters.
488 ARMBaseInstrInfo::isMoveInstr(const MachineInstr &MI,
489 unsigned &SrcReg, unsigned &DstReg,
490 unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
491 SrcSubIdx = DstSubIdx = 0; // No sub-registers.
493 unsigned oc = MI.getOpcode();
494 if (oc == ARM::FCPYS ||
498 SrcReg = MI.getOperand(1).getReg();
499 DstReg = MI.getOperand(0).getReg();
502 else if (oc == getOpcode(ARMII::MOVr)) {
503 assert(MI.getDesc().getNumOperands() >= 2 &&
504 MI.getOperand(0).isReg() &&
505 MI.getOperand(1).isReg() &&
506 "Invalid ARM MOV instruction");
507 SrcReg = MI.getOperand(1).getReg();
508 DstReg = MI.getOperand(0).getReg();
516 ARMBaseInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
517 int &FrameIndex) const {
518 unsigned oc = MI->getOpcode();
519 if (oc == getOpcode(ARMII::LDRrr)) {
520 if (MI->getOperand(1).isFI() &&
521 MI->getOperand(2).isReg() &&
522 MI->getOperand(3).isImm() &&
523 MI->getOperand(2).getReg() == 0 &&
524 MI->getOperand(3).getImm() == 0) {
525 FrameIndex = MI->getOperand(1).getIndex();
526 return MI->getOperand(0).getReg();
529 else if (oc == getOpcode(ARMII::LDRri)) {
530 if (MI->getOperand(1).isFI() &&
531 MI->getOperand(2).isImm() &&
532 MI->getOperand(2).getImm() == 0) {
533 FrameIndex = MI->getOperand(1).getIndex();
534 return MI->getOperand(0).getReg();
537 else if (oc == ARM::FLDD || oc == ARM::FLDS) {
538 if (MI->getOperand(1).isFI() &&
539 MI->getOperand(2).isImm() &&
540 MI->getOperand(2).getImm() == 0) {
541 FrameIndex = MI->getOperand(1).getIndex();
542 return MI->getOperand(0).getReg();
550 ARMBaseInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
551 int &FrameIndex) const {
552 unsigned oc = MI->getOpcode();
553 if (oc == getOpcode(ARMII::STRrr)) {
554 if (MI->getOperand(1).isFI() &&
555 MI->getOperand(2).isReg() &&
556 MI->getOperand(3).isImm() &&
557 MI->getOperand(2).getReg() == 0 &&
558 MI->getOperand(3).getImm() == 0) {
559 FrameIndex = MI->getOperand(1).getIndex();
560 return MI->getOperand(0).getReg();
563 else if (oc == getOpcode(ARMII::STRri)) {
564 if (MI->getOperand(1).isFI() &&
565 MI->getOperand(2).isImm() &&
566 MI->getOperand(2).getImm() == 0) {
567 FrameIndex = MI->getOperand(1).getIndex();
568 return MI->getOperand(0).getReg();
571 else if (oc == ARM::FSTD || oc == ARM::FSTS) {
572 if (MI->getOperand(1).isFI() &&
573 MI->getOperand(2).isImm() &&
574 MI->getOperand(2).getImm() == 0) {
575 FrameIndex = MI->getOperand(1).getIndex();
576 return MI->getOperand(0).getReg();
584 ARMBaseInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
585 MachineBasicBlock::iterator I,
586 unsigned DestReg, unsigned SrcReg,
587 const TargetRegisterClass *DestRC,
588 const TargetRegisterClass *SrcRC) const {
589 DebugLoc DL = DebugLoc::getUnknownLoc();
590 if (I != MBB.end()) DL = I->getDebugLoc();
592 if (DestRC != SrcRC) {
593 // Not yet supported!
597 if (DestRC == ARM::GPRRegisterClass)
598 AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(getOpcode(ARMII::MOVr)),
599 DestReg).addReg(SrcReg)));
600 else if (DestRC == ARM::SPRRegisterClass)
601 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FCPYS), DestReg)
603 else if (DestRC == ARM::DPRRegisterClass)
604 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FCPYD), DestReg)
606 else if (DestRC == ARM::QPRRegisterClass)
607 BuildMI(MBB, I, DL, get(ARM::VMOVQ), DestReg).addReg(SrcReg);
614 void ARMBaseInstrInfo::
615 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
616 unsigned SrcReg, bool isKill, int FI,
617 const TargetRegisterClass *RC) const {
618 DebugLoc DL = DebugLoc::getUnknownLoc();
619 if (I != MBB.end()) DL = I->getDebugLoc();
621 if (RC == ARM::GPRRegisterClass) {
622 AddDefaultPred(BuildMI(MBB, I, DL, get(getOpcode(ARMII::STRrr)))
623 .addReg(SrcReg, getKillRegState(isKill))
624 .addFrameIndex(FI).addReg(0).addImm(0));
625 } else if (RC == ARM::DPRRegisterClass) {
626 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FSTD))
627 .addReg(SrcReg, getKillRegState(isKill))
628 .addFrameIndex(FI).addImm(0));
630 assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
631 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FSTS))
632 .addReg(SrcReg, getKillRegState(isKill))
633 .addFrameIndex(FI).addImm(0));
637 void ARMBaseInstrInfo::
638 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
639 unsigned DestReg, int FI,
640 const TargetRegisterClass *RC) const {
641 DebugLoc DL = DebugLoc::getUnknownLoc();
642 if (I != MBB.end()) DL = I->getDebugLoc();
644 if (RC == ARM::GPRRegisterClass) {
645 AddDefaultPred(BuildMI(MBB, I, DL, get(getOpcode(ARMII::LDRrr)), DestReg)
646 .addFrameIndex(FI).addReg(0).addImm(0));
647 } else if (RC == ARM::DPRRegisterClass) {
648 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FLDD), DestReg)
649 .addFrameIndex(FI).addImm(0));
651 assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
652 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FLDS), DestReg)
653 .addFrameIndex(FI).addImm(0));
657 MachineInstr *ARMBaseInstrInfo::
658 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
659 const SmallVectorImpl<unsigned> &Ops, int FI) const {
660 if (Ops.size() != 1) return NULL;
662 unsigned OpNum = Ops[0];
663 unsigned Opc = MI->getOpcode();
664 MachineInstr *NewMI = NULL;
665 if (Opc == getOpcode(ARMII::MOVr)) {
666 // If it is updating CPSR, then it cannot be folded.
667 if (MI->getOperand(4).getReg() != ARM::CPSR) {
668 unsigned Pred = MI->getOperand(2).getImm();
669 unsigned PredReg = MI->getOperand(3).getReg();
670 if (OpNum == 0) { // move -> store
671 unsigned SrcReg = MI->getOperand(1).getReg();
672 bool isKill = MI->getOperand(1).isKill();
673 bool isUndef = MI->getOperand(1).isUndef();
674 NewMI = BuildMI(MF, MI->getDebugLoc(), get(getOpcode(ARMII::STRrr)))
675 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
676 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
677 } else { // move -> load
678 unsigned DstReg = MI->getOperand(0).getReg();
679 bool isDead = MI->getOperand(0).isDead();
680 bool isUndef = MI->getOperand(0).isUndef();
681 NewMI = BuildMI(MF, MI->getDebugLoc(), get(getOpcode(ARMII::LDRrr)))
684 getDeadRegState(isDead) |
685 getUndefRegState(isUndef))
686 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
690 else if (Opc == ARM::FCPYS) {
691 unsigned Pred = MI->getOperand(2).getImm();
692 unsigned PredReg = MI->getOperand(3).getReg();
693 if (OpNum == 0) { // move -> store
694 unsigned SrcReg = MI->getOperand(1).getReg();
695 bool isKill = MI->getOperand(1).isKill();
696 bool isUndef = MI->getOperand(1).isUndef();
697 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTS))
698 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
700 .addImm(0).addImm(Pred).addReg(PredReg);
701 } else { // move -> load
702 unsigned DstReg = MI->getOperand(0).getReg();
703 bool isDead = MI->getOperand(0).isDead();
704 bool isUndef = MI->getOperand(0).isUndef();
705 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDS))
708 getDeadRegState(isDead) |
709 getUndefRegState(isUndef))
710 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
713 else if (Opc == ARM::FCPYD) {
714 unsigned Pred = MI->getOperand(2).getImm();
715 unsigned PredReg = MI->getOperand(3).getReg();
716 if (OpNum == 0) { // move -> store
717 unsigned SrcReg = MI->getOperand(1).getReg();
718 bool isKill = MI->getOperand(1).isKill();
719 bool isUndef = MI->getOperand(1).isUndef();
720 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTD))
721 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
722 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
723 } else { // move -> load
724 unsigned DstReg = MI->getOperand(0).getReg();
725 bool isDead = MI->getOperand(0).isDead();
726 bool isUndef = MI->getOperand(0).isUndef();
727 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDD))
730 getDeadRegState(isDead) |
731 getUndefRegState(isUndef))
732 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
740 ARMBaseInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
742 const SmallVectorImpl<unsigned> &Ops,
743 MachineInstr* LoadMI) const {
748 ARMBaseInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
749 const SmallVectorImpl<unsigned> &Ops) const {
750 if (Ops.size() != 1) return false;
752 unsigned Opc = MI->getOpcode();
753 if (Opc == getOpcode(ARMII::MOVr)) {
754 // If it is updating CPSR, then it cannot be folded.
755 return MI->getOperand(4).getReg() != ARM::CPSR;
756 } else if (Opc == ARM::FCPYS || Opc == ARM::FCPYD) {
758 } else if (Opc == ARM::VMOVD || Opc == ARM::VMOVQ) {
759 return false; // FIXME