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()
34 : TargetInstrInfoImpl(ARMInsts, array_lengthof(ARMInsts)) {
38 ARMBaseInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
39 MachineBasicBlock::iterator &MBBI,
40 LiveVariables *LV) const {
41 // FIXME: Thumb2 support.
46 MachineInstr *MI = MBBI;
47 MachineFunction &MF = *MI->getParent()->getParent();
48 unsigned TSFlags = MI->getDesc().TSFlags;
50 switch ((TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift) {
52 case ARMII::IndexModePre:
55 case ARMII::IndexModePost:
59 // Try splitting an indexed load/store to an un-indexed one plus an add/sub
61 unsigned MemOpc = getUnindexedOpcode(MI->getOpcode());
65 MachineInstr *UpdateMI = NULL;
66 MachineInstr *MemMI = NULL;
67 unsigned AddrMode = (TSFlags & ARMII::AddrModeMask);
68 const TargetInstrDesc &TID = MI->getDesc();
69 unsigned NumOps = TID.getNumOperands();
70 bool isLoad = !TID.mayStore();
71 const MachineOperand &WB = isLoad ? MI->getOperand(1) : MI->getOperand(0);
72 const MachineOperand &Base = MI->getOperand(2);
73 const MachineOperand &Offset = MI->getOperand(NumOps-3);
74 unsigned WBReg = WB.getReg();
75 unsigned BaseReg = Base.getReg();
76 unsigned OffReg = Offset.getReg();
77 unsigned OffImm = MI->getOperand(NumOps-2).getImm();
78 ARMCC::CondCodes Pred = (ARMCC::CondCodes)MI->getOperand(NumOps-1).getImm();
81 assert(false && "Unknown indexed op!");
83 case ARMII::AddrMode2: {
84 bool isSub = ARM_AM::getAM2Op(OffImm) == ARM_AM::sub;
85 unsigned Amt = ARM_AM::getAM2Offset(OffImm);
87 if (ARM_AM::getSOImmVal(Amt) == -1)
88 // Can't encode it in a so_imm operand. This transformation will
89 // add more than 1 instruction. Abandon!
91 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
92 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
93 .addReg(BaseReg).addImm(Amt)
94 .addImm(Pred).addReg(0).addReg(0);
95 } else if (Amt != 0) {
96 ARM_AM::ShiftOpc ShOpc = ARM_AM::getAM2ShiftOpc(OffImm);
97 unsigned SOOpc = ARM_AM::getSORegOpc(ShOpc, Amt);
98 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
99 get(isSub ? ARM::SUBrs : ARM::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 ? ARM::SUBrr : ARM::ADDrr), WBReg)
105 .addReg(BaseReg).addReg(OffReg)
106 .addImm(Pred).addReg(0).addReg(0);
109 case ARMII::AddrMode3 : {
110 bool isSub = ARM_AM::getAM3Op(OffImm) == ARM_AM::sub;
111 unsigned Amt = ARM_AM::getAM3Offset(OffImm);
113 // Immediate is 8-bits. It's guaranteed to fit in a so_imm operand.
114 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
115 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
116 .addReg(BaseReg).addImm(Amt)
117 .addImm(Pred).addReg(0).addReg(0);
119 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
120 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
121 .addReg(BaseReg).addReg(OffReg)
122 .addImm(Pred).addReg(0).addReg(0);
127 std::vector<MachineInstr*> NewMIs;
130 MemMI = BuildMI(MF, MI->getDebugLoc(),
131 get(MemOpc), MI->getOperand(0).getReg())
132 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
134 MemMI = BuildMI(MF, MI->getDebugLoc(),
135 get(MemOpc)).addReg(MI->getOperand(1).getReg())
136 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
137 NewMIs.push_back(MemMI);
138 NewMIs.push_back(UpdateMI);
141 MemMI = BuildMI(MF, MI->getDebugLoc(),
142 get(MemOpc), MI->getOperand(0).getReg())
143 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
145 MemMI = BuildMI(MF, MI->getDebugLoc(),
146 get(MemOpc)).addReg(MI->getOperand(1).getReg())
147 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
149 UpdateMI->getOperand(0).setIsDead();
150 NewMIs.push_back(UpdateMI);
151 NewMIs.push_back(MemMI);
154 // Transfer LiveVariables states, kill / dead info.
156 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
157 MachineOperand &MO = MI->getOperand(i);
158 if (MO.isReg() && MO.getReg() &&
159 TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
160 unsigned Reg = MO.getReg();
162 LiveVariables::VarInfo &VI = LV->getVarInfo(Reg);
164 MachineInstr *NewMI = (Reg == WBReg) ? UpdateMI : MemMI;
166 LV->addVirtualRegisterDead(Reg, NewMI);
168 if (MO.isUse() && MO.isKill()) {
169 for (unsigned j = 0; j < 2; ++j) {
170 // Look at the two new MI's in reverse order.
171 MachineInstr *NewMI = NewMIs[j];
172 if (!NewMI->readsRegister(Reg))
174 LV->addVirtualRegisterKilled(Reg, NewMI);
175 if (VI.removeKill(MI))
176 VI.Kills.push_back(NewMI);
184 MFI->insert(MBBI, NewMIs[1]);
185 MFI->insert(MBBI, NewMIs[0]);
191 ARMBaseInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
192 MachineBasicBlock *&FBB,
193 SmallVectorImpl<MachineOperand> &Cond,
194 bool AllowModify) const {
195 // If the block has no terminators, it just falls into the block after it.
196 MachineBasicBlock::iterator I = MBB.end();
197 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
200 // Get the last instruction in the block.
201 MachineInstr *LastInst = I;
203 // If there is only one terminator instruction, process it.
204 unsigned LastOpc = LastInst->getOpcode();
205 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
206 if (isUncondBranchOpcode(LastOpc)) {
207 TBB = LastInst->getOperand(0).getMBB();
210 if (isCondBranchOpcode(LastOpc)) {
211 // Block ends with fall-through condbranch.
212 TBB = LastInst->getOperand(0).getMBB();
213 Cond.push_back(LastInst->getOperand(1));
214 Cond.push_back(LastInst->getOperand(2));
217 return true; // Can't handle indirect branch.
220 // Get the instruction before it if it is a terminator.
221 MachineInstr *SecondLastInst = I;
223 // If there are three terminators, we don't know what sort of block this is.
224 if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
227 // If the block ends with a B and a Bcc, handle it.
228 unsigned SecondLastOpc = SecondLastInst->getOpcode();
229 if (isCondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
230 TBB = SecondLastInst->getOperand(0).getMBB();
231 Cond.push_back(SecondLastInst->getOperand(1));
232 Cond.push_back(SecondLastInst->getOperand(2));
233 FBB = LastInst->getOperand(0).getMBB();
237 // If the block ends with two unconditional branches, handle it. The second
238 // one is not executed, so remove it.
239 if (isUncondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
240 TBB = SecondLastInst->getOperand(0).getMBB();
243 I->eraseFromParent();
247 // ...likewise if it ends with a branch table followed by an unconditional
248 // branch. The branch folder can create these, and we must get rid of them for
249 // correctness of Thumb constant islands.
250 if (isJumpTableBranchOpcode(SecondLastOpc) &&
251 isUncondBranchOpcode(LastOpc)) {
254 I->eraseFromParent();
258 // Otherwise, can't handle this.
263 unsigned ARMBaseInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
264 MachineBasicBlock::iterator I = MBB.end();
265 if (I == MBB.begin()) return 0;
267 if (!isUncondBranchOpcode(I->getOpcode()) &&
268 !isCondBranchOpcode(I->getOpcode()))
271 // Remove the branch.
272 I->eraseFromParent();
276 if (I == MBB.begin()) return 1;
278 if (!isCondBranchOpcode(I->getOpcode()))
281 // Remove the branch.
282 I->eraseFromParent();
287 ARMBaseInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
288 MachineBasicBlock *FBB,
289 const SmallVectorImpl<MachineOperand> &Cond) const {
290 // FIXME this should probably have a DebugLoc argument
291 DebugLoc dl = DebugLoc::getUnknownLoc();
293 ARMFunctionInfo *AFI = MBB.getParent()->getInfo<ARMFunctionInfo>();
294 int BOpc = !AFI->isThumbFunction()
295 ? ARM::B : (AFI->isThumb2Function() ? ARM::t2B : ARM::tB);
296 int BccOpc = !AFI->isThumbFunction()
297 ? ARM::Bcc : (AFI->isThumb2Function() ? ARM::t2Bcc : ARM::tBcc);
299 // Shouldn't be a fall through.
300 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
301 assert((Cond.size() == 2 || Cond.size() == 0) &&
302 "ARM branch conditions have two components!");
305 if (Cond.empty()) // Unconditional branch?
306 BuildMI(&MBB, dl, get(BOpc)).addMBB(TBB);
308 BuildMI(&MBB, dl, get(BccOpc)).addMBB(TBB)
309 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
313 // Two-way conditional branch.
314 BuildMI(&MBB, dl, get(BccOpc)).addMBB(TBB)
315 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
316 BuildMI(&MBB, dl, get(BOpc)).addMBB(FBB);
320 bool ARMBaseInstrInfo::
321 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
322 ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm();
323 Cond[0].setImm(ARMCC::getOppositeCondition(CC));
327 bool ARMBaseInstrInfo::
328 PredicateInstruction(MachineInstr *MI,
329 const SmallVectorImpl<MachineOperand> &Pred) const {
330 unsigned Opc = MI->getOpcode();
331 if (isUncondBranchOpcode(Opc)) {
332 MI->setDesc(get(getMatchingCondBranchOpcode(Opc)));
333 MI->addOperand(MachineOperand::CreateImm(Pred[0].getImm()));
334 MI->addOperand(MachineOperand::CreateReg(Pred[1].getReg(), false));
338 int PIdx = MI->findFirstPredOperandIdx();
340 MachineOperand &PMO = MI->getOperand(PIdx);
341 PMO.setImm(Pred[0].getImm());
342 MI->getOperand(PIdx+1).setReg(Pred[1].getReg());
348 bool ARMBaseInstrInfo::
349 SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
350 const SmallVectorImpl<MachineOperand> &Pred2) const {
351 if (Pred1.size() > 2 || Pred2.size() > 2)
354 ARMCC::CondCodes CC1 = (ARMCC::CondCodes)Pred1[0].getImm();
355 ARMCC::CondCodes CC2 = (ARMCC::CondCodes)Pred2[0].getImm();
365 return CC2 == ARMCC::HI;
367 return CC2 == ARMCC::LO || CC2 == ARMCC::EQ;
369 return CC2 == ARMCC::GT;
371 return CC2 == ARMCC::LT;
375 bool ARMBaseInstrInfo::DefinesPredicate(MachineInstr *MI,
376 std::vector<MachineOperand> &Pred) const {
377 const TargetInstrDesc &TID = MI->getDesc();
378 if (!TID.getImplicitDefs() && !TID.hasOptionalDef())
382 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
383 const MachineOperand &MO = MI->getOperand(i);
384 if (MO.isReg() && MO.getReg() == ARM::CPSR) {
394 /// FIXME: Works around a gcc miscompilation with -fstrict-aliasing
395 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
396 unsigned JTI) DISABLE_INLINE;
397 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
399 return JT[JTI].MBBs.size();
402 /// GetInstSize - Return the size of the specified MachineInstr.
404 unsigned ARMBaseInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
405 const MachineBasicBlock &MBB = *MI->getParent();
406 const MachineFunction *MF = MBB.getParent();
407 const TargetAsmInfo *TAI = MF->getTarget().getTargetAsmInfo();
409 // Basic size info comes from the TSFlags field.
410 const TargetInstrDesc &TID = MI->getDesc();
411 unsigned TSFlags = TID.TSFlags;
413 unsigned Opc = MI->getOpcode();
414 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
416 // If this machine instr is an inline asm, measure it.
417 if (MI->getOpcode() == ARM::INLINEASM)
418 return getInlineAsmLength(MI->getOperand(0).getSymbolName(), *TAI);
423 llvm_unreachable("Unknown or unset size field for instr!");
424 case TargetInstrInfo::IMPLICIT_DEF:
425 case TargetInstrInfo::DECLARE:
426 case TargetInstrInfo::DBG_LABEL:
427 case TargetInstrInfo::EH_LABEL:
432 case ARMII::Size8Bytes: return 8; // ARM instruction x 2.
433 case ARMII::Size4Bytes: return 4; // ARM / Thumb2 instruction.
434 case ARMII::Size2Bytes: return 2; // Thumb1 instruction.
435 case ARMII::SizeSpecial: {
437 case ARM::CONSTPOOL_ENTRY:
438 // If this machine instr is a constant pool entry, its size is recorded as
440 return MI->getOperand(2).getImm();
441 case ARM::Int_eh_sjlj_setjmp:
450 // These are jumptable branches, i.e. a branch followed by an inlined
451 // jumptable. The size is 4 + 4 * number of entries. For TBB, each
452 // entry is one byte; TBH two byte each.
453 unsigned EntrySize = (Opc == ARM::t2TBB)
454 ? 1 : ((Opc == ARM::t2TBH) ? 2 : 4);
455 unsigned NumOps = TID.getNumOperands();
456 MachineOperand JTOP =
457 MI->getOperand(NumOps - (TID.isPredicable() ? 3 : 2));
458 unsigned JTI = JTOP.getIndex();
459 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
460 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
461 assert(JTI < JT.size());
462 // Thumb instructions are 2 byte aligned, but JT entries are 4 byte
463 // 4 aligned. The assembler / linker may add 2 byte padding just before
464 // the JT entries. The size does not include this padding; the
465 // constant islands pass does separate bookkeeping for it.
466 // FIXME: If we know the size of the function is less than (1 << 16) *2
467 // bytes, we can use 16-bit entries instead. Then there won't be an
469 unsigned InstSize = (Opc == ARM::tBR_JTr || Opc == ARM::t2BR_JT) ? 2 : 4;
470 unsigned NumEntries = getNumJTEntries(JT, JTI);
471 if (Opc == ARM::t2TBB && (NumEntries & 1))
472 // Make sure the instruction that follows TBB is 2-byte aligned.
473 // FIXME: Constant island pass should insert an "ALIGN" instruction
476 return NumEntries * EntrySize + InstSize;
479 // Otherwise, pseudo-instruction sizes are zero.
484 return 0; // Not reached
487 /// Return true if the instruction is a register to register move and
488 /// leave the source and dest operands in the passed parameters.
491 ARMBaseInstrInfo::isMoveInstr(const MachineInstr &MI,
492 unsigned &SrcReg, unsigned &DstReg,
493 unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
494 SrcSubIdx = DstSubIdx = 0; // No sub-registers.
496 switch (MI.getOpcode()) {
502 SrcReg = MI.getOperand(1).getReg();
503 DstReg = MI.getOperand(0).getReg();
508 case ARM::tMOVgpr2tgpr:
509 case ARM::tMOVtgpr2gpr:
510 case ARM::tMOVgpr2gpr:
512 assert(MI.getDesc().getNumOperands() >= 2 &&
513 MI.getOperand(0).isReg() &&
514 MI.getOperand(1).isReg() &&
515 "Invalid ARM MOV instruction");
516 SrcReg = MI.getOperand(1).getReg();
517 DstReg = MI.getOperand(0).getReg();
526 ARMBaseInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
527 int &FrameIndex) const {
528 switch (MI->getOpcode()) {
531 case ARM::t2LDRs: // FIXME: don't use t2LDRs to access frame.
532 if (MI->getOperand(1).isFI() &&
533 MI->getOperand(2).isReg() &&
534 MI->getOperand(3).isImm() &&
535 MI->getOperand(2).getReg() == 0 &&
536 MI->getOperand(3).getImm() == 0) {
537 FrameIndex = MI->getOperand(1).getIndex();
538 return MI->getOperand(0).getReg();
543 if (MI->getOperand(1).isFI() &&
544 MI->getOperand(2).isImm() &&
545 MI->getOperand(2).getImm() == 0) {
546 FrameIndex = MI->getOperand(1).getIndex();
547 return MI->getOperand(0).getReg();
552 if (MI->getOperand(1).isFI() &&
553 MI->getOperand(2).isImm() &&
554 MI->getOperand(2).getImm() == 0) {
555 FrameIndex = MI->getOperand(1).getIndex();
556 return MI->getOperand(0).getReg();
565 ARMBaseInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
566 int &FrameIndex) const {
567 switch (MI->getOpcode()) {
570 case ARM::t2STRs: // FIXME: don't use t2STRs to access frame.
571 if (MI->getOperand(1).isFI() &&
572 MI->getOperand(2).isReg() &&
573 MI->getOperand(3).isImm() &&
574 MI->getOperand(2).getReg() == 0 &&
575 MI->getOperand(3).getImm() == 0) {
576 FrameIndex = MI->getOperand(1).getIndex();
577 return MI->getOperand(0).getReg();
582 if (MI->getOperand(1).isFI() &&
583 MI->getOperand(2).isImm() &&
584 MI->getOperand(2).getImm() == 0) {
585 FrameIndex = MI->getOperand(1).getIndex();
586 return MI->getOperand(0).getReg();
591 if (MI->getOperand(1).isFI() &&
592 MI->getOperand(2).isImm() &&
593 MI->getOperand(2).getImm() == 0) {
594 FrameIndex = MI->getOperand(1).getIndex();
595 return MI->getOperand(0).getReg();
604 ARMBaseInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
605 MachineBasicBlock::iterator I,
606 unsigned DestReg, unsigned SrcReg,
607 const TargetRegisterClass *DestRC,
608 const TargetRegisterClass *SrcRC) const {
609 DebugLoc DL = DebugLoc::getUnknownLoc();
610 if (I != MBB.end()) DL = I->getDebugLoc();
612 if (DestRC != SrcRC) {
613 if (((DestRC == ARM::DPRRegisterClass) &&
614 (SrcRC == ARM::DPR_VFP2RegisterClass)) ||
615 ((SrcRC == ARM::DPRRegisterClass) &&
616 (DestRC == ARM::DPR_VFP2RegisterClass))) {
617 // Allow copy between DPR and DPR_VFP2.
623 if (DestRC == ARM::GPRRegisterClass) {
624 AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::MOVr),
625 DestReg).addReg(SrcReg)));
626 } else if (DestRC == ARM::SPRRegisterClass) {
627 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FCPYS), DestReg)
629 } else if ((DestRC == ARM::DPRRegisterClass) ||
630 (DestRC == ARM::DPR_VFP2RegisterClass)) {
631 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FCPYD), DestReg)
633 } else if (DestRC == ARM::QPRRegisterClass) {
634 BuildMI(MBB, I, DL, get(ARM::VMOVQ), DestReg).addReg(SrcReg);
642 void ARMBaseInstrInfo::
643 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
644 unsigned SrcReg, bool isKill, int FI,
645 const TargetRegisterClass *RC) const {
646 DebugLoc DL = DebugLoc::getUnknownLoc();
647 if (I != MBB.end()) DL = I->getDebugLoc();
649 if (RC == ARM::GPRRegisterClass) {
650 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::STR))
651 .addReg(SrcReg, getKillRegState(isKill))
652 .addFrameIndex(FI).addReg(0).addImm(0));
653 } else if (RC == ARM::DPRRegisterClass || RC == ARM::DPR_VFP2RegisterClass) {
654 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FSTD))
655 .addReg(SrcReg, getKillRegState(isKill))
656 .addFrameIndex(FI).addImm(0));
658 assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
659 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FSTS))
660 .addReg(SrcReg, getKillRegState(isKill))
661 .addFrameIndex(FI).addImm(0));
665 void ARMBaseInstrInfo::
666 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
667 unsigned DestReg, int FI,
668 const TargetRegisterClass *RC) const {
669 DebugLoc DL = DebugLoc::getUnknownLoc();
670 if (I != MBB.end()) DL = I->getDebugLoc();
672 if (RC == ARM::GPRRegisterClass) {
673 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::LDR), DestReg)
674 .addFrameIndex(FI).addReg(0).addImm(0));
675 } else if (RC == ARM::DPRRegisterClass || RC == ARM::DPR_VFP2RegisterClass) {
676 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FLDD), DestReg)
677 .addFrameIndex(FI).addImm(0));
679 assert(RC == ARM::SPRRegisterClass && "Unknown regclass!");
680 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FLDS), DestReg)
681 .addFrameIndex(FI).addImm(0));
685 MachineInstr *ARMBaseInstrInfo::
686 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
687 const SmallVectorImpl<unsigned> &Ops, int FI) const {
688 if (Ops.size() != 1) return NULL;
690 unsigned OpNum = Ops[0];
691 unsigned Opc = MI->getOpcode();
692 MachineInstr *NewMI = NULL;
693 if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) { // FIXME: tMOVgpr2gpr etc.?
694 // If it is updating CPSR, then it cannot be folded.
695 if (MI->getOperand(4).getReg() != ARM::CPSR || MI->getOperand(4).isDead()) {
696 unsigned Pred = MI->getOperand(2).getImm();
697 unsigned PredReg = MI->getOperand(3).getReg();
698 if (OpNum == 0) { // move -> store
699 unsigned SrcReg = MI->getOperand(1).getReg();
700 bool isKill = MI->getOperand(1).isKill();
701 bool isUndef = MI->getOperand(1).isUndef();
702 if (Opc == ARM::MOVr)
703 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::STR))
704 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
705 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
707 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2STRi12))
708 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
709 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
710 } else { // move -> load
711 unsigned DstReg = MI->getOperand(0).getReg();
712 bool isDead = MI->getOperand(0).isDead();
713 bool isUndef = MI->getOperand(0).isUndef();
714 if (Opc == ARM::MOVr)
715 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::LDR))
718 getDeadRegState(isDead) |
719 getUndefRegState(isUndef))
720 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
722 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2LDRi12))
725 getDeadRegState(isDead) |
726 getUndefRegState(isUndef))
727 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
731 else if (Opc == ARM::FCPYS) {
732 unsigned Pred = MI->getOperand(2).getImm();
733 unsigned PredReg = MI->getOperand(3).getReg();
734 if (OpNum == 0) { // move -> store
735 unsigned SrcReg = MI->getOperand(1).getReg();
736 bool isKill = MI->getOperand(1).isKill();
737 bool isUndef = MI->getOperand(1).isUndef();
738 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTS))
739 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
741 .addImm(0).addImm(Pred).addReg(PredReg);
742 } else { // move -> load
743 unsigned DstReg = MI->getOperand(0).getReg();
744 bool isDead = MI->getOperand(0).isDead();
745 bool isUndef = MI->getOperand(0).isUndef();
746 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDS))
749 getDeadRegState(isDead) |
750 getUndefRegState(isUndef))
751 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
754 else if (Opc == ARM::FCPYD) {
755 unsigned Pred = MI->getOperand(2).getImm();
756 unsigned PredReg = MI->getOperand(3).getReg();
757 if (OpNum == 0) { // move -> store
758 unsigned SrcReg = MI->getOperand(1).getReg();
759 bool isKill = MI->getOperand(1).isKill();
760 bool isUndef = MI->getOperand(1).isUndef();
761 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTD))
762 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef))
763 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
764 } else { // move -> load
765 unsigned DstReg = MI->getOperand(0).getReg();
766 bool isDead = MI->getOperand(0).isDead();
767 bool isUndef = MI->getOperand(0).isUndef();
768 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDD))
771 getDeadRegState(isDead) |
772 getUndefRegState(isUndef))
773 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
781 ARMBaseInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
783 const SmallVectorImpl<unsigned> &Ops,
784 MachineInstr* LoadMI) const {
790 ARMBaseInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
791 const SmallVectorImpl<unsigned> &Ops) const {
792 if (Ops.size() != 1) return false;
794 unsigned Opc = MI->getOpcode();
795 if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) {
796 // If it is updating CPSR, then it cannot be folded.
797 return MI->getOperand(4).getReg() != ARM::CPSR ||MI->getOperand(4).isDead();
798 } else if (Opc == ARM::FCPYS || Opc == ARM::FCPYD) {
800 } else if (Opc == ARM::VMOVD || Opc == ARM::VMOVQ) {
801 return false; // FIXME
807 int llvm::getMatchingCondBranchOpcode(int Opc) {
810 else if (Opc == ARM::tB)
812 else if (Opc == ARM::t2B)
815 llvm_unreachable("Unknown unconditional branch opcode!");
820 void llvm::emitARMRegPlusImmediate(MachineBasicBlock &MBB,
821 MachineBasicBlock::iterator &MBBI, DebugLoc dl,
822 unsigned DestReg, unsigned BaseReg, int NumBytes,
823 ARMCC::CondCodes Pred, unsigned PredReg,
824 const ARMBaseInstrInfo &TII) {
825 bool isSub = NumBytes < 0;
826 if (isSub) NumBytes = -NumBytes;
829 unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
830 unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
831 assert(ThisVal && "Didn't extract field correctly");
833 // We will handle these bits from offset, clear them.
834 NumBytes &= ~ThisVal;
836 assert(ARM_AM::getSOImmVal(ThisVal) != -1 && "Bit extraction didn't work?");
838 // Build the new ADD / SUB.
839 unsigned Opc = isSub ? ARM::SUBri : ARM::ADDri;
840 BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
841 .addReg(BaseReg, RegState::Kill).addImm(ThisVal)
842 .addImm((unsigned)Pred).addReg(PredReg).addReg(0);
847 int llvm::rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
848 unsigned FrameReg, int Offset,
849 const ARMBaseInstrInfo &TII) {
850 unsigned Opcode = MI.getOpcode();
851 const TargetInstrDesc &Desc = MI.getDesc();
852 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
855 // Memory operands in inline assembly always use AddrMode2.
856 if (Opcode == ARM::INLINEASM)
857 AddrMode = ARMII::AddrMode2;
859 if (Opcode == ARM::ADDri) {
860 Offset += MI.getOperand(FrameRegIdx+1).getImm();
862 // Turn it into a move.
863 MI.setDesc(TII.get(ARM::MOVr));
864 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
865 MI.RemoveOperand(FrameRegIdx+1);
867 } else if (Offset < 0) {
870 MI.setDesc(TII.get(ARM::SUBri));
873 // Common case: small offset, fits into instruction.
874 if (ARM_AM::getSOImmVal(Offset) != -1) {
875 // Replace the FrameIndex with sp / fp
876 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
877 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset);
881 // Otherwise, pull as much of the immedidate into this ADDri/SUBri
883 unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
884 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
886 // We will handle these bits from offset, clear them.
887 Offset &= ~ThisImmVal;
889 // Get the properly encoded SOImmVal field.
890 assert(ARM_AM::getSOImmVal(ThisImmVal) != -1 &&
891 "Bit extraction didn't work?");
892 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(ThisImmVal);
896 unsigned NumBits = 0;
899 case ARMII::AddrMode2: {
900 ImmIdx = FrameRegIdx+2;
901 InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
902 if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
907 case ARMII::AddrMode3: {
908 ImmIdx = FrameRegIdx+2;
909 InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
910 if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
915 case ARMII::AddrMode5: {
916 ImmIdx = FrameRegIdx+1;
917 InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
918 if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
925 llvm_unreachable("Unsupported addressing mode!");
929 Offset += InstrOffs * Scale;
930 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
936 // Attempt to fold address comp. if opcode has offset bits
938 // Common case: small offset, fits into instruction.
939 MachineOperand &ImmOp = MI.getOperand(ImmIdx);
940 int ImmedOffset = Offset / Scale;
941 unsigned Mask = (1 << NumBits) - 1;
942 if ((unsigned)Offset <= Mask * Scale) {
943 // Replace the FrameIndex with sp
944 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
946 ImmedOffset |= 1 << NumBits;
947 ImmOp.ChangeToImmediate(ImmedOffset);
951 // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
952 ImmedOffset = ImmedOffset & Mask;
954 ImmedOffset |= 1 << NumBits;
955 ImmOp.ChangeToImmediate(ImmedOffset);
956 Offset &= ~(Mask*Scale);
960 return (isSub) ? -Offset : Offset;