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 "ARMConstantPoolValue.h"
18 #include "ARMGenInstrInfo.inc"
19 #include "ARMMachineFunctionInfo.h"
20 #include "ARMRegisterInfo.h"
21 #include "llvm/Constants.h"
22 #include "llvm/Function.h"
23 #include "llvm/GlobalValue.h"
24 #include "llvm/ADT/STLExtras.h"
25 #include "llvm/CodeGen/LiveVariables.h"
26 #include "llvm/CodeGen/MachineConstantPool.h"
27 #include "llvm/CodeGen/MachineFrameInfo.h"
28 #include "llvm/CodeGen/MachineInstrBuilder.h"
29 #include "llvm/CodeGen/MachineJumpTableInfo.h"
30 #include "llvm/CodeGen/MachineMemOperand.h"
31 #include "llvm/CodeGen/MachineRegisterInfo.h"
32 #include "llvm/CodeGen/PseudoSourceValue.h"
33 #include "llvm/MC/MCAsmInfo.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Support/ErrorHandling.h"
40 EnableARM3Addr("enable-arm-3-addr-conv", cl::Hidden,
41 cl::desc("Enable ARM 2-addr to 3-addr conv"));
43 ARMBaseInstrInfo::ARMBaseInstrInfo(const ARMSubtarget& STI)
44 : TargetInstrInfoImpl(ARMInsts, array_lengthof(ARMInsts)),
49 ARMBaseInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
50 MachineBasicBlock::iterator &MBBI,
51 LiveVariables *LV) const {
52 // FIXME: Thumb2 support.
57 MachineInstr *MI = MBBI;
58 MachineFunction &MF = *MI->getParent()->getParent();
59 uint64_t TSFlags = MI->getDesc().TSFlags;
61 switch ((TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift) {
63 case ARMII::IndexModePre:
66 case ARMII::IndexModePost:
70 // Try splitting an indexed load/store to an un-indexed one plus an add/sub
72 unsigned MemOpc = getUnindexedOpcode(MI->getOpcode());
76 MachineInstr *UpdateMI = NULL;
77 MachineInstr *MemMI = NULL;
78 unsigned AddrMode = (TSFlags & ARMII::AddrModeMask);
79 const TargetInstrDesc &TID = MI->getDesc();
80 unsigned NumOps = TID.getNumOperands();
81 bool isLoad = !TID.mayStore();
82 const MachineOperand &WB = isLoad ? MI->getOperand(1) : MI->getOperand(0);
83 const MachineOperand &Base = MI->getOperand(2);
84 const MachineOperand &Offset = MI->getOperand(NumOps-3);
85 unsigned WBReg = WB.getReg();
86 unsigned BaseReg = Base.getReg();
87 unsigned OffReg = Offset.getReg();
88 unsigned OffImm = MI->getOperand(NumOps-2).getImm();
89 ARMCC::CondCodes Pred = (ARMCC::CondCodes)MI->getOperand(NumOps-1).getImm();
92 assert(false && "Unknown indexed op!");
94 case ARMII::AddrMode2: {
95 bool isSub = ARM_AM::getAM2Op(OffImm) == ARM_AM::sub;
96 unsigned Amt = ARM_AM::getAM2Offset(OffImm);
98 if (ARM_AM::getSOImmVal(Amt) == -1)
99 // Can't encode it in a so_imm operand. This transformation will
100 // add more than 1 instruction. Abandon!
102 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
103 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
104 .addReg(BaseReg).addImm(Amt)
105 .addImm(Pred).addReg(0).addReg(0);
106 } else if (Amt != 0) {
107 ARM_AM::ShiftOpc ShOpc = ARM_AM::getAM2ShiftOpc(OffImm);
108 unsigned SOOpc = ARM_AM::getSORegOpc(ShOpc, Amt);
109 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
110 get(isSub ? ARM::SUBrs : ARM::ADDrs), WBReg)
111 .addReg(BaseReg).addReg(OffReg).addReg(0).addImm(SOOpc)
112 .addImm(Pred).addReg(0).addReg(0);
114 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
115 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
116 .addReg(BaseReg).addReg(OffReg)
117 .addImm(Pred).addReg(0).addReg(0);
120 case ARMII::AddrMode3 : {
121 bool isSub = ARM_AM::getAM3Op(OffImm) == ARM_AM::sub;
122 unsigned Amt = ARM_AM::getAM3Offset(OffImm);
124 // Immediate is 8-bits. It's guaranteed to fit in a so_imm operand.
125 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
126 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
127 .addReg(BaseReg).addImm(Amt)
128 .addImm(Pred).addReg(0).addReg(0);
130 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
131 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
132 .addReg(BaseReg).addReg(OffReg)
133 .addImm(Pred).addReg(0).addReg(0);
138 std::vector<MachineInstr*> NewMIs;
141 MemMI = BuildMI(MF, MI->getDebugLoc(),
142 get(MemOpc), MI->getOperand(0).getReg())
143 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
145 MemMI = BuildMI(MF, MI->getDebugLoc(),
146 get(MemOpc)).addReg(MI->getOperand(1).getReg())
147 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
148 NewMIs.push_back(MemMI);
149 NewMIs.push_back(UpdateMI);
152 MemMI = BuildMI(MF, MI->getDebugLoc(),
153 get(MemOpc), MI->getOperand(0).getReg())
154 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
156 MemMI = BuildMI(MF, MI->getDebugLoc(),
157 get(MemOpc)).addReg(MI->getOperand(1).getReg())
158 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
160 UpdateMI->getOperand(0).setIsDead();
161 NewMIs.push_back(UpdateMI);
162 NewMIs.push_back(MemMI);
165 // Transfer LiveVariables states, kill / dead info.
167 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
168 MachineOperand &MO = MI->getOperand(i);
169 if (MO.isReg() && MO.getReg() &&
170 TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
171 unsigned Reg = MO.getReg();
173 LiveVariables::VarInfo &VI = LV->getVarInfo(Reg);
175 MachineInstr *NewMI = (Reg == WBReg) ? UpdateMI : MemMI;
177 LV->addVirtualRegisterDead(Reg, NewMI);
179 if (MO.isUse() && MO.isKill()) {
180 for (unsigned j = 0; j < 2; ++j) {
181 // Look at the two new MI's in reverse order.
182 MachineInstr *NewMI = NewMIs[j];
183 if (!NewMI->readsRegister(Reg))
185 LV->addVirtualRegisterKilled(Reg, NewMI);
186 if (VI.removeKill(MI))
187 VI.Kills.push_back(NewMI);
195 MFI->insert(MBBI, NewMIs[1]);
196 MFI->insert(MBBI, NewMIs[0]);
201 ARMBaseInstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
202 MachineBasicBlock::iterator MI,
203 const std::vector<CalleeSavedInfo> &CSI,
204 const TargetRegisterInfo *TRI) const {
209 if (MI != MBB.end()) DL = MI->getDebugLoc();
211 for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
212 unsigned Reg = CSI[i].getReg();
215 // Add the callee-saved register as live-in unless it's LR and
216 // @llvm.returnaddress is called. If LR is returned for @llvm.returnaddress
217 // then it's already added to the function and entry block live-in sets.
218 if (Reg == ARM::LR) {
219 MachineFunction &MF = *MBB.getParent();
220 if (MF.getFrameInfo()->isReturnAddressTaken() &&
221 MF.getRegInfo().isLiveIn(Reg))
228 // Insert the spill to the stack frame. The register is killed at the spill
230 const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
231 storeRegToStackSlot(MBB, MI, Reg, isKill,
232 CSI[i].getFrameIdx(), RC, TRI);
239 ARMBaseInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
240 MachineBasicBlock *&FBB,
241 SmallVectorImpl<MachineOperand> &Cond,
242 bool AllowModify) const {
243 // If the block has no terminators, it just falls into the block after it.
244 MachineBasicBlock::iterator I = MBB.end();
245 if (I == MBB.begin())
248 while (I->isDebugValue()) {
249 if (I == MBB.begin())
253 if (!isUnpredicatedTerminator(I))
256 // Get the last instruction in the block.
257 MachineInstr *LastInst = I;
259 // If there is only one terminator instruction, process it.
260 unsigned LastOpc = LastInst->getOpcode();
261 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
262 if (isUncondBranchOpcode(LastOpc)) {
263 TBB = LastInst->getOperand(0).getMBB();
266 if (isCondBranchOpcode(LastOpc)) {
267 // Block ends with fall-through condbranch.
268 TBB = LastInst->getOperand(0).getMBB();
269 Cond.push_back(LastInst->getOperand(1));
270 Cond.push_back(LastInst->getOperand(2));
273 return true; // Can't handle indirect branch.
276 // Get the instruction before it if it is a terminator.
277 MachineInstr *SecondLastInst = I;
279 // If there are three terminators, we don't know what sort of block this is.
280 if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
283 // If the block ends with a B and a Bcc, handle it.
284 unsigned SecondLastOpc = SecondLastInst->getOpcode();
285 if (isCondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
286 TBB = SecondLastInst->getOperand(0).getMBB();
287 Cond.push_back(SecondLastInst->getOperand(1));
288 Cond.push_back(SecondLastInst->getOperand(2));
289 FBB = LastInst->getOperand(0).getMBB();
293 // If the block ends with two unconditional branches, handle it. The second
294 // one is not executed, so remove it.
295 if (isUncondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
296 TBB = SecondLastInst->getOperand(0).getMBB();
299 I->eraseFromParent();
303 // ...likewise if it ends with a branch table followed by an unconditional
304 // branch. The branch folder can create these, and we must get rid of them for
305 // correctness of Thumb constant islands.
306 if ((isJumpTableBranchOpcode(SecondLastOpc) ||
307 isIndirectBranchOpcode(SecondLastOpc)) &&
308 isUncondBranchOpcode(LastOpc)) {
311 I->eraseFromParent();
315 // Otherwise, can't handle this.
320 unsigned ARMBaseInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
321 MachineBasicBlock::iterator I = MBB.end();
322 if (I == MBB.begin()) return 0;
324 while (I->isDebugValue()) {
325 if (I == MBB.begin())
329 if (!isUncondBranchOpcode(I->getOpcode()) &&
330 !isCondBranchOpcode(I->getOpcode()))
333 // Remove the branch.
334 I->eraseFromParent();
338 if (I == MBB.begin()) return 1;
340 if (!isCondBranchOpcode(I->getOpcode()))
343 // Remove the branch.
344 I->eraseFromParent();
349 ARMBaseInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
350 MachineBasicBlock *FBB,
351 const SmallVectorImpl<MachineOperand> &Cond) const {
352 // FIXME this should probably have a DebugLoc argument
355 ARMFunctionInfo *AFI = MBB.getParent()->getInfo<ARMFunctionInfo>();
356 int BOpc = !AFI->isThumbFunction()
357 ? ARM::B : (AFI->isThumb2Function() ? ARM::t2B : ARM::tB);
358 int BccOpc = !AFI->isThumbFunction()
359 ? ARM::Bcc : (AFI->isThumb2Function() ? ARM::t2Bcc : ARM::tBcc);
361 // Shouldn't be a fall through.
362 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
363 assert((Cond.size() == 2 || Cond.size() == 0) &&
364 "ARM branch conditions have two components!");
367 if (Cond.empty()) // Unconditional branch?
368 BuildMI(&MBB, dl, get(BOpc)).addMBB(TBB);
370 BuildMI(&MBB, dl, get(BccOpc)).addMBB(TBB)
371 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
375 // Two-way conditional branch.
376 BuildMI(&MBB, dl, get(BccOpc)).addMBB(TBB)
377 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
378 BuildMI(&MBB, dl, get(BOpc)).addMBB(FBB);
382 bool ARMBaseInstrInfo::
383 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
384 ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm();
385 Cond[0].setImm(ARMCC::getOppositeCondition(CC));
389 bool ARMBaseInstrInfo::
390 PredicateInstruction(MachineInstr *MI,
391 const SmallVectorImpl<MachineOperand> &Pred) const {
392 unsigned Opc = MI->getOpcode();
393 if (isUncondBranchOpcode(Opc)) {
394 MI->setDesc(get(getMatchingCondBranchOpcode(Opc)));
395 MI->addOperand(MachineOperand::CreateImm(Pred[0].getImm()));
396 MI->addOperand(MachineOperand::CreateReg(Pred[1].getReg(), false));
400 int PIdx = MI->findFirstPredOperandIdx();
402 MachineOperand &PMO = MI->getOperand(PIdx);
403 PMO.setImm(Pred[0].getImm());
404 MI->getOperand(PIdx+1).setReg(Pred[1].getReg());
410 bool ARMBaseInstrInfo::
411 SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
412 const SmallVectorImpl<MachineOperand> &Pred2) const {
413 if (Pred1.size() > 2 || Pred2.size() > 2)
416 ARMCC::CondCodes CC1 = (ARMCC::CondCodes)Pred1[0].getImm();
417 ARMCC::CondCodes CC2 = (ARMCC::CondCodes)Pred2[0].getImm();
427 return CC2 == ARMCC::HI;
429 return CC2 == ARMCC::LO || CC2 == ARMCC::EQ;
431 return CC2 == ARMCC::GT;
433 return CC2 == ARMCC::LT;
437 bool ARMBaseInstrInfo::DefinesPredicate(MachineInstr *MI,
438 std::vector<MachineOperand> &Pred) const {
439 // FIXME: This confuses implicit_def with optional CPSR def.
440 const TargetInstrDesc &TID = MI->getDesc();
441 if (!TID.getImplicitDefs() && !TID.hasOptionalDef())
445 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
446 const MachineOperand &MO = MI->getOperand(i);
447 if (MO.isReg() && MO.getReg() == ARM::CPSR) {
456 /// isPredicable - Return true if the specified instruction can be predicated.
457 /// By default, this returns true for every instruction with a
458 /// PredicateOperand.
459 bool ARMBaseInstrInfo::isPredicable(MachineInstr *MI) const {
460 const TargetInstrDesc &TID = MI->getDesc();
461 if (!TID.isPredicable())
464 if ((TID.TSFlags & ARMII::DomainMask) == ARMII::DomainNEON) {
465 ARMFunctionInfo *AFI =
466 MI->getParent()->getParent()->getInfo<ARMFunctionInfo>();
467 return AFI->isThumb2Function();
472 /// FIXME: Works around a gcc miscompilation with -fstrict-aliasing.
474 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
476 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
478 assert(JTI < JT.size());
479 return JT[JTI].MBBs.size();
482 /// GetInstSize - Return the size of the specified MachineInstr.
484 unsigned ARMBaseInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
485 const MachineBasicBlock &MBB = *MI->getParent();
486 const MachineFunction *MF = MBB.getParent();
487 const MCAsmInfo *MAI = MF->getTarget().getMCAsmInfo();
489 // Basic size info comes from the TSFlags field.
490 const TargetInstrDesc &TID = MI->getDesc();
491 uint64_t TSFlags = TID.TSFlags;
493 unsigned Opc = MI->getOpcode();
494 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
496 // If this machine instr is an inline asm, measure it.
497 if (MI->getOpcode() == ARM::INLINEASM)
498 return getInlineAsmLength(MI->getOperand(0).getSymbolName(), *MAI);
503 llvm_unreachable("Unknown or unset size field for instr!");
504 case TargetOpcode::IMPLICIT_DEF:
505 case TargetOpcode::KILL:
506 case TargetOpcode::DBG_LABEL:
507 case TargetOpcode::EH_LABEL:
508 case TargetOpcode::DBG_VALUE:
513 case ARMII::Size8Bytes: return 8; // ARM instruction x 2.
514 case ARMII::Size4Bytes: return 4; // ARM / Thumb2 instruction.
515 case ARMII::Size2Bytes: return 2; // Thumb1 instruction.
516 case ARMII::SizeSpecial: {
518 case ARM::CONSTPOOL_ENTRY:
519 // If this machine instr is a constant pool entry, its size is recorded as
521 return MI->getOperand(2).getImm();
522 case ARM::Int_eh_sjlj_longjmp:
524 case ARM::tInt_eh_sjlj_longjmp:
526 case ARM::Int_eh_sjlj_setjmp:
527 case ARM::Int_eh_sjlj_setjmp_nofp:
529 case ARM::tInt_eh_sjlj_setjmp:
530 case ARM::t2Int_eh_sjlj_setjmp:
531 case ARM::t2Int_eh_sjlj_setjmp_nofp:
540 // These are jumptable branches, i.e. a branch followed by an inlined
541 // jumptable. The size is 4 + 4 * number of entries. For TBB, each
542 // entry is one byte; TBH two byte each.
543 unsigned EntrySize = (Opc == ARM::t2TBB)
544 ? 1 : ((Opc == ARM::t2TBH) ? 2 : 4);
545 unsigned NumOps = TID.getNumOperands();
546 MachineOperand JTOP =
547 MI->getOperand(NumOps - (TID.isPredicable() ? 3 : 2));
548 unsigned JTI = JTOP.getIndex();
549 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
551 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
552 assert(JTI < JT.size());
553 // Thumb instructions are 2 byte aligned, but JT entries are 4 byte
554 // 4 aligned. The assembler / linker may add 2 byte padding just before
555 // the JT entries. The size does not include this padding; the
556 // constant islands pass does separate bookkeeping for it.
557 // FIXME: If we know the size of the function is less than (1 << 16) *2
558 // bytes, we can use 16-bit entries instead. Then there won't be an
560 unsigned InstSize = (Opc == ARM::tBR_JTr || Opc == ARM::t2BR_JT) ? 2 : 4;
561 unsigned NumEntries = getNumJTEntries(JT, JTI);
562 if (Opc == ARM::t2TBB && (NumEntries & 1))
563 // Make sure the instruction that follows TBB is 2-byte aligned.
564 // FIXME: Constant island pass should insert an "ALIGN" instruction
567 return NumEntries * EntrySize + InstSize;
570 // Otherwise, pseudo-instruction sizes are zero.
575 return 0; // Not reached
578 /// Return true if the instruction is a register to register move and
579 /// leave the source and dest operands in the passed parameters.
582 ARMBaseInstrInfo::isMoveInstr(const MachineInstr &MI,
583 unsigned &SrcReg, unsigned &DstReg,
584 unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
585 switch (MI.getOpcode()) {
592 SrcReg = MI.getOperand(1).getReg();
593 DstReg = MI.getOperand(0).getReg();
594 SrcSubIdx = MI.getOperand(1).getSubReg();
595 DstSubIdx = MI.getOperand(0).getSubReg();
600 case ARM::tMOVgpr2tgpr:
601 case ARM::tMOVtgpr2gpr:
602 case ARM::tMOVgpr2gpr:
604 assert(MI.getDesc().getNumOperands() >= 2 &&
605 MI.getOperand(0).isReg() &&
606 MI.getOperand(1).isReg() &&
607 "Invalid ARM MOV instruction");
608 SrcReg = MI.getOperand(1).getReg();
609 DstReg = MI.getOperand(0).getReg();
610 SrcSubIdx = MI.getOperand(1).getSubReg();
611 DstSubIdx = MI.getOperand(0).getSubReg();
620 ARMBaseInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
621 int &FrameIndex) const {
622 switch (MI->getOpcode()) {
625 case ARM::t2LDRs: // FIXME: don't use t2LDRs to access frame.
626 if (MI->getOperand(1).isFI() &&
627 MI->getOperand(2).isReg() &&
628 MI->getOperand(3).isImm() &&
629 MI->getOperand(2).getReg() == 0 &&
630 MI->getOperand(3).getImm() == 0) {
631 FrameIndex = MI->getOperand(1).getIndex();
632 return MI->getOperand(0).getReg();
637 if (MI->getOperand(1).isFI() &&
638 MI->getOperand(2).isImm() &&
639 MI->getOperand(2).getImm() == 0) {
640 FrameIndex = MI->getOperand(1).getIndex();
641 return MI->getOperand(0).getReg();
646 if (MI->getOperand(1).isFI() &&
647 MI->getOperand(2).isImm() &&
648 MI->getOperand(2).getImm() == 0) {
649 FrameIndex = MI->getOperand(1).getIndex();
650 return MI->getOperand(0).getReg();
659 ARMBaseInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
660 int &FrameIndex) const {
661 switch (MI->getOpcode()) {
664 case ARM::t2STRs: // FIXME: don't use t2STRs to access frame.
665 if (MI->getOperand(1).isFI() &&
666 MI->getOperand(2).isReg() &&
667 MI->getOperand(3).isImm() &&
668 MI->getOperand(2).getReg() == 0 &&
669 MI->getOperand(3).getImm() == 0) {
670 FrameIndex = MI->getOperand(1).getIndex();
671 return MI->getOperand(0).getReg();
676 if (MI->getOperand(1).isFI() &&
677 MI->getOperand(2).isImm() &&
678 MI->getOperand(2).getImm() == 0) {
679 FrameIndex = MI->getOperand(1).getIndex();
680 return MI->getOperand(0).getReg();
685 if (MI->getOperand(1).isFI() &&
686 MI->getOperand(2).isImm() &&
687 MI->getOperand(2).getImm() == 0) {
688 FrameIndex = MI->getOperand(1).getIndex();
689 return MI->getOperand(0).getReg();
698 ARMBaseInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
699 MachineBasicBlock::iterator I,
700 unsigned DestReg, unsigned SrcReg,
701 const TargetRegisterClass *DestRC,
702 const TargetRegisterClass *SrcRC,
704 // tGPR is used sometimes in ARM instructions that need to avoid using
705 // certain registers. Just treat it as GPR here.
706 if (DestRC == ARM::tGPRRegisterClass)
707 DestRC = ARM::GPRRegisterClass;
708 if (SrcRC == ARM::tGPRRegisterClass)
709 SrcRC = ARM::GPRRegisterClass;
711 // Allow DPR / DPR_VFP2 / DPR_8 cross-class copies.
712 if (DestRC == ARM::DPR_8RegisterClass)
713 DestRC = ARM::DPR_VFP2RegisterClass;
714 if (SrcRC == ARM::DPR_8RegisterClass)
715 SrcRC = ARM::DPR_VFP2RegisterClass;
717 // Allow QPR / QPR_VFP2 / QPR_8 cross-class copies.
718 if (DestRC == ARM::QPR_VFP2RegisterClass ||
719 DestRC == ARM::QPR_8RegisterClass)
720 DestRC = ARM::QPRRegisterClass;
721 if (SrcRC == ARM::QPR_VFP2RegisterClass ||
722 SrcRC == ARM::QPR_8RegisterClass)
723 SrcRC = ARM::QPRRegisterClass;
725 // Allow QQPR / QQPR_VFP2 cross-class copies.
726 if (DestRC == ARM::QQPR_VFP2RegisterClass)
727 DestRC = ARM::QQPRRegisterClass;
728 if (SrcRC == ARM::QQPR_VFP2RegisterClass)
729 SrcRC = ARM::QQPRRegisterClass;
731 // Disallow copies of unequal sizes.
732 if (DestRC != SrcRC && DestRC->getSize() != SrcRC->getSize())
735 if (DestRC == ARM::GPRRegisterClass) {
736 if (SrcRC == ARM::SPRRegisterClass)
737 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VMOVRS), DestReg)
740 AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::MOVr),
741 DestReg).addReg(SrcReg)));
745 if (DestRC == ARM::SPRRegisterClass)
746 Opc = (SrcRC == ARM::GPRRegisterClass ? ARM::VMOVSR : ARM::VMOVS);
747 else if (DestRC == ARM::DPRRegisterClass)
749 else if (DestRC == ARM::DPR_VFP2RegisterClass ||
750 SrcRC == ARM::DPR_VFP2RegisterClass)
751 // Always use neon reg-reg move if source or dest is NEON-only regclass.
752 Opc = ARM::VMOVDneon;
753 else if (DestRC == ARM::QPRRegisterClass)
755 else if (DestRC == ARM::QQPRRegisterClass)
757 else if (DestRC == ARM::QQQQPRRegisterClass)
762 MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(Opc), DestReg);
764 if (Opc != ARM::VMOVQQ && Opc != ARM::VMOVQQQQ)
772 MachineInstrBuilder &AddDReg(MachineInstrBuilder &MIB,
773 unsigned Reg, unsigned SubIdx, unsigned State,
774 const TargetRegisterInfo *TRI) {
776 return MIB.addReg(Reg, State);
778 if (TargetRegisterInfo::isPhysicalRegister(Reg))
779 return MIB.addReg(TRI->getSubReg(Reg, SubIdx), State);
780 return MIB.addReg(Reg, State, SubIdx);
783 void ARMBaseInstrInfo::
784 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
785 unsigned SrcReg, bool isKill, int FI,
786 const TargetRegisterClass *RC,
787 const TargetRegisterInfo *TRI) const {
789 if (I != MBB.end()) DL = I->getDebugLoc();
790 MachineFunction &MF = *MBB.getParent();
791 MachineFrameInfo &MFI = *MF.getFrameInfo();
792 unsigned Align = MFI.getObjectAlignment(FI);
794 MachineMemOperand *MMO =
795 MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
796 MachineMemOperand::MOStore, 0,
797 MFI.getObjectSize(FI),
800 // tGPR is used sometimes in ARM instructions that need to avoid using
801 // certain registers. Just treat it as GPR here.
802 if (RC == ARM::tGPRRegisterClass)
803 RC = ARM::GPRRegisterClass;
805 if (RC == ARM::GPRRegisterClass) {
806 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::STR))
807 .addReg(SrcReg, getKillRegState(isKill))
808 .addFrameIndex(FI).addReg(0).addImm(0).addMemOperand(MMO));
809 } else if (RC == ARM::SPRRegisterClass) {
810 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTRS))
811 .addReg(SrcReg, getKillRegState(isKill))
812 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
813 } else if (RC == ARM::DPRRegisterClass ||
814 RC == ARM::DPR_VFP2RegisterClass ||
815 RC == ARM::DPR_8RegisterClass) {
816 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTRD))
817 .addReg(SrcReg, getKillRegState(isKill))
818 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
819 } else if (RC == ARM::QPRRegisterClass ||
820 RC == ARM::QPR_VFP2RegisterClass ||
821 RC == ARM::QPR_8RegisterClass) {
822 // FIXME: Neon instructions should support predicates
823 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
824 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VST1q))
825 .addFrameIndex(FI).addImm(128)
826 .addReg(SrcReg, getKillRegState(isKill))
827 .addMemOperand(MMO));
829 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMQ))
830 .addReg(SrcReg, getKillRegState(isKill))
832 .addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4))
833 .addMemOperand(MMO));
835 } else if (RC == ARM::QQPRRegisterClass || RC == ARM::QQPR_VFP2RegisterClass){
836 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
837 // FIXME: It's possible to only store part of the QQ register if the
838 // spilled def has a sub-register index.
839 MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(ARM::VST2q32))
840 .addFrameIndex(FI).addImm(128);
841 MIB = AddDReg(MIB, SrcReg, ARM::dsub_0, getKillRegState(isKill), TRI);
842 MIB = AddDReg(MIB, SrcReg, ARM::dsub_1, 0, TRI);
843 MIB = AddDReg(MIB, SrcReg, ARM::dsub_2, 0, TRI);
844 MIB = AddDReg(MIB, SrcReg, ARM::dsub_3, 0, TRI);
845 AddDefaultPred(MIB.addMemOperand(MMO));
847 MachineInstrBuilder MIB =
848 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMD))
850 .addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4)))
852 MIB = AddDReg(MIB, SrcReg, ARM::dsub_0, getKillRegState(isKill), TRI);
853 MIB = AddDReg(MIB, SrcReg, ARM::dsub_1, 0, TRI);
854 MIB = AddDReg(MIB, SrcReg, ARM::dsub_2, 0, TRI);
855 AddDReg(MIB, SrcReg, ARM::dsub_3, 0, TRI);
858 assert(RC == ARM::QQQQPRRegisterClass && "Unknown regclass!");
859 MachineInstrBuilder MIB =
860 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMD))
862 .addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4)))
864 MIB = AddDReg(MIB, SrcReg, ARM::dsub_0, getKillRegState(isKill), TRI);
865 MIB = AddDReg(MIB, SrcReg, ARM::dsub_1, 0, TRI);
866 MIB = AddDReg(MIB, SrcReg, ARM::dsub_2, 0, TRI);
867 MIB = AddDReg(MIB, SrcReg, ARM::dsub_3, 0, TRI);
868 MIB = AddDReg(MIB, SrcReg, ARM::dsub_4, 0, TRI);
869 MIB = AddDReg(MIB, SrcReg, ARM::dsub_5, 0, TRI);
870 MIB = AddDReg(MIB, SrcReg, ARM::dsub_6, 0, TRI);
871 AddDReg(MIB, SrcReg, ARM::dsub_7, 0, TRI);
875 void ARMBaseInstrInfo::
876 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
877 unsigned DestReg, int FI,
878 const TargetRegisterClass *RC,
879 const TargetRegisterInfo *TRI) const {
881 if (I != MBB.end()) DL = I->getDebugLoc();
882 MachineFunction &MF = *MBB.getParent();
883 MachineFrameInfo &MFI = *MF.getFrameInfo();
884 unsigned Align = MFI.getObjectAlignment(FI);
885 MachineMemOperand *MMO =
886 MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
887 MachineMemOperand::MOLoad, 0,
888 MFI.getObjectSize(FI),
891 // tGPR is used sometimes in ARM instructions that need to avoid using
892 // certain registers. Just treat it as GPR here.
893 if (RC == ARM::tGPRRegisterClass)
894 RC = ARM::GPRRegisterClass;
896 if (RC == ARM::GPRRegisterClass) {
897 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::LDR), DestReg)
898 .addFrameIndex(FI).addReg(0).addImm(0).addMemOperand(MMO));
899 } else if (RC == ARM::SPRRegisterClass) {
900 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDRS), DestReg)
901 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
902 } else if (RC == ARM::DPRRegisterClass ||
903 RC == ARM::DPR_VFP2RegisterClass ||
904 RC == ARM::DPR_8RegisterClass) {
905 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDRD), DestReg)
906 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
907 } else if (RC == ARM::QPRRegisterClass ||
908 RC == ARM::QPR_VFP2RegisterClass ||
909 RC == ARM::QPR_8RegisterClass) {
910 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
911 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLD1q), DestReg)
912 .addFrameIndex(FI).addImm(128)
913 .addMemOperand(MMO));
915 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMQ), DestReg)
917 .addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4))
918 .addMemOperand(MMO));
920 } else if (RC == ARM::QQPRRegisterClass || RC == ARM::QQPR_VFP2RegisterClass){
921 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
922 MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(ARM::VLD2q32));
923 MIB = AddDReg(MIB, DestReg, ARM::dsub_0, RegState::Define, TRI);
924 MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::Define, TRI);
925 MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::Define, TRI);
926 MIB = AddDReg(MIB, DestReg, ARM::dsub_3, RegState::Define, TRI);
927 AddDefaultPred(MIB.addFrameIndex(FI).addImm(128).addMemOperand(MMO));
929 MachineInstrBuilder MIB =
930 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMD))
932 .addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4)))
934 MIB = AddDReg(MIB, DestReg, ARM::dsub_0, RegState::Define, TRI);
935 MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::Define, TRI);
936 MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::Define, TRI);
937 AddDReg(MIB, DestReg, ARM::dsub_3, RegState::Define, TRI);
940 assert(RC == ARM::QQQQPRRegisterClass && "Unknown regclass!");
941 MachineInstrBuilder MIB =
942 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMD))
944 .addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4)))
946 MIB = AddDReg(MIB, DestReg, ARM::dsub_0, RegState::Define, TRI);
947 MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::Define, TRI);
948 MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::Define, TRI);
949 MIB = AddDReg(MIB, DestReg, ARM::dsub_3, RegState::Define, TRI);
950 MIB = AddDReg(MIB, DestReg, ARM::dsub_4, RegState::Define, TRI);
951 MIB = AddDReg(MIB, DestReg, ARM::dsub_5, RegState::Define, TRI);
952 MIB = AddDReg(MIB, DestReg, ARM::dsub_6, RegState::Define, TRI);
953 AddDReg(MIB, DestReg, ARM::dsub_7, RegState::Define, TRI);
958 ARMBaseInstrInfo::emitFrameIndexDebugValue(MachineFunction &MF,
959 int FrameIx, uint64_t Offset,
962 MachineInstrBuilder MIB = BuildMI(MF, DL, get(ARM::DBG_VALUE))
963 .addFrameIndex(FrameIx).addImm(0).addImm(Offset).addMetadata(MDPtr);
967 MachineInstr *ARMBaseInstrInfo::
968 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
969 const SmallVectorImpl<unsigned> &Ops, int FI) const {
970 if (Ops.size() != 1) return NULL;
972 unsigned OpNum = Ops[0];
973 unsigned Opc = MI->getOpcode();
974 MachineInstr *NewMI = NULL;
975 if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) {
976 // If it is updating CPSR, then it cannot be folded.
977 if (MI->getOperand(4).getReg() == ARM::CPSR && !MI->getOperand(4).isDead())
979 unsigned Pred = MI->getOperand(2).getImm();
980 unsigned PredReg = MI->getOperand(3).getReg();
981 if (OpNum == 0) { // move -> store
982 unsigned SrcReg = MI->getOperand(1).getReg();
983 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
984 bool isKill = MI->getOperand(1).isKill();
985 bool isUndef = MI->getOperand(1).isUndef();
986 if (Opc == ARM::MOVr)
987 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::STR))
989 getKillRegState(isKill) | getUndefRegState(isUndef),
991 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
993 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2STRi12))
995 getKillRegState(isKill) | getUndefRegState(isUndef),
997 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
998 } else { // move -> load
999 unsigned DstReg = MI->getOperand(0).getReg();
1000 unsigned DstSubReg = MI->getOperand(0).getSubReg();
1001 bool isDead = MI->getOperand(0).isDead();
1002 bool isUndef = MI->getOperand(0).isUndef();
1003 if (Opc == ARM::MOVr)
1004 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::LDR))
1007 getDeadRegState(isDead) |
1008 getUndefRegState(isUndef), DstSubReg)
1009 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
1011 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2LDRi12))
1014 getDeadRegState(isDead) |
1015 getUndefRegState(isUndef), DstSubReg)
1016 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
1018 } else if (Opc == ARM::tMOVgpr2gpr ||
1019 Opc == ARM::tMOVtgpr2gpr ||
1020 Opc == ARM::tMOVgpr2tgpr) {
1021 if (OpNum == 0) { // move -> store
1022 unsigned SrcReg = MI->getOperand(1).getReg();
1023 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
1024 bool isKill = MI->getOperand(1).isKill();
1025 bool isUndef = MI->getOperand(1).isUndef();
1026 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2STRi12))
1028 getKillRegState(isKill) | getUndefRegState(isUndef),
1030 .addFrameIndex(FI).addImm(0).addImm(ARMCC::AL).addReg(0);
1031 } else { // move -> load
1032 unsigned DstReg = MI->getOperand(0).getReg();
1033 unsigned DstSubReg = MI->getOperand(0).getSubReg();
1034 bool isDead = MI->getOperand(0).isDead();
1035 bool isUndef = MI->getOperand(0).isUndef();
1036 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2LDRi12))
1039 getDeadRegState(isDead) |
1040 getUndefRegState(isUndef),
1042 .addFrameIndex(FI).addImm(0).addImm(ARMCC::AL).addReg(0);
1044 } else if (Opc == ARM::VMOVS) {
1045 unsigned Pred = MI->getOperand(2).getImm();
1046 unsigned PredReg = MI->getOperand(3).getReg();
1047 if (OpNum == 0) { // move -> store
1048 unsigned SrcReg = MI->getOperand(1).getReg();
1049 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
1050 bool isKill = MI->getOperand(1).isKill();
1051 bool isUndef = MI->getOperand(1).isUndef();
1052 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::VSTRS))
1053 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef),
1056 .addImm(0).addImm(Pred).addReg(PredReg);
1057 } else { // move -> load
1058 unsigned DstReg = MI->getOperand(0).getReg();
1059 unsigned DstSubReg = MI->getOperand(0).getSubReg();
1060 bool isDead = MI->getOperand(0).isDead();
1061 bool isUndef = MI->getOperand(0).isUndef();
1062 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::VLDRS))
1065 getDeadRegState(isDead) |
1066 getUndefRegState(isUndef),
1068 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
1070 } else if (Opc == ARM::VMOVD || Opc == ARM::VMOVDneon) {
1071 unsigned Pred = MI->getOperand(2).getImm();
1072 unsigned PredReg = MI->getOperand(3).getReg();
1073 if (OpNum == 0) { // move -> store
1074 unsigned SrcReg = MI->getOperand(1).getReg();
1075 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
1076 bool isKill = MI->getOperand(1).isKill();
1077 bool isUndef = MI->getOperand(1).isUndef();
1078 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::VSTRD))
1080 getKillRegState(isKill) | getUndefRegState(isUndef),
1082 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
1083 } else { // move -> load
1084 unsigned DstReg = MI->getOperand(0).getReg();
1085 unsigned DstSubReg = MI->getOperand(0).getSubReg();
1086 bool isDead = MI->getOperand(0).isDead();
1087 bool isUndef = MI->getOperand(0).isUndef();
1088 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::VLDRD))
1091 getDeadRegState(isDead) |
1092 getUndefRegState(isUndef),
1094 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
1096 } else if (Opc == ARM::VMOVQ) {
1097 MachineFrameInfo &MFI = *MF.getFrameInfo();
1098 unsigned Pred = MI->getOperand(2).getImm();
1099 unsigned PredReg = MI->getOperand(3).getReg();
1100 if (OpNum == 0) { // move -> store
1101 unsigned SrcReg = MI->getOperand(1).getReg();
1102 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
1103 bool isKill = MI->getOperand(1).isKill();
1104 bool isUndef = MI->getOperand(1).isUndef();
1105 if (MFI.getObjectAlignment(FI) >= 16 &&
1106 getRegisterInfo().canRealignStack(MF)) {
1107 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::VST1q))
1108 .addFrameIndex(FI).addImm(128)
1110 getKillRegState(isKill) | getUndefRegState(isUndef),
1112 .addImm(Pred).addReg(PredReg);
1114 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::VSTMQ))
1116 getKillRegState(isKill) | getUndefRegState(isUndef),
1118 .addFrameIndex(FI).addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4))
1119 .addImm(Pred).addReg(PredReg);
1121 } else { // move -> load
1122 unsigned DstReg = MI->getOperand(0).getReg();
1123 unsigned DstSubReg = MI->getOperand(0).getSubReg();
1124 bool isDead = MI->getOperand(0).isDead();
1125 bool isUndef = MI->getOperand(0).isUndef();
1126 if (MFI.getObjectAlignment(FI) >= 16 &&
1127 getRegisterInfo().canRealignStack(MF)) {
1128 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::VLD1q))
1131 getDeadRegState(isDead) |
1132 getUndefRegState(isUndef),
1134 .addFrameIndex(FI).addImm(128).addImm(Pred).addReg(PredReg);
1136 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::VLDMQ))
1139 getDeadRegState(isDead) |
1140 getUndefRegState(isUndef),
1142 .addFrameIndex(FI).addImm(ARM_AM::getAM5Opc(ARM_AM::ia, 4))
1143 .addImm(Pred).addReg(PredReg);
1152 ARMBaseInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
1154 const SmallVectorImpl<unsigned> &Ops,
1155 MachineInstr* LoadMI) const {
1161 ARMBaseInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
1162 const SmallVectorImpl<unsigned> &Ops) const {
1163 if (Ops.size() != 1) return false;
1165 unsigned Opc = MI->getOpcode();
1166 if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) {
1167 // If it is updating CPSR, then it cannot be folded.
1168 return MI->getOperand(4).getReg() != ARM::CPSR ||
1169 MI->getOperand(4).isDead();
1170 } else if (Opc == ARM::tMOVgpr2gpr ||
1171 Opc == ARM::tMOVtgpr2gpr ||
1172 Opc == ARM::tMOVgpr2tgpr) {
1174 } else if (Opc == ARM::VMOVS || Opc == ARM::VMOVD ||
1175 Opc == ARM::VMOVDneon || Opc == ARM::VMOVQ) {
1179 // FIXME: VMOVQQ and VMOVQQQQ?
1184 /// Create a copy of a const pool value. Update CPI to the new index and return
1186 static unsigned duplicateCPV(MachineFunction &MF, unsigned &CPI) {
1187 MachineConstantPool *MCP = MF.getConstantPool();
1188 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1190 const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPI];
1191 assert(MCPE.isMachineConstantPoolEntry() &&
1192 "Expecting a machine constantpool entry!");
1193 ARMConstantPoolValue *ACPV =
1194 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
1196 unsigned PCLabelId = AFI->createConstPoolEntryUId();
1197 ARMConstantPoolValue *NewCPV = 0;
1198 if (ACPV->isGlobalValue())
1199 NewCPV = new ARMConstantPoolValue(ACPV->getGV(), PCLabelId,
1201 else if (ACPV->isExtSymbol())
1202 NewCPV = new ARMConstantPoolValue(MF.getFunction()->getContext(),
1203 ACPV->getSymbol(), PCLabelId, 4);
1204 else if (ACPV->isBlockAddress())
1205 NewCPV = new ARMConstantPoolValue(ACPV->getBlockAddress(), PCLabelId,
1206 ARMCP::CPBlockAddress, 4);
1208 llvm_unreachable("Unexpected ARM constantpool value type!!");
1209 CPI = MCP->getConstantPoolIndex(NewCPV, MCPE.getAlignment());
1213 void ARMBaseInstrInfo::
1214 reMaterialize(MachineBasicBlock &MBB,
1215 MachineBasicBlock::iterator I,
1216 unsigned DestReg, unsigned SubIdx,
1217 const MachineInstr *Orig,
1218 const TargetRegisterInfo &TRI) const {
1219 unsigned Opcode = Orig->getOpcode();
1222 MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
1223 MI->substituteRegister(Orig->getOperand(0).getReg(), DestReg, SubIdx, TRI);
1227 case ARM::tLDRpci_pic:
1228 case ARM::t2LDRpci_pic: {
1229 MachineFunction &MF = *MBB.getParent();
1230 unsigned CPI = Orig->getOperand(1).getIndex();
1231 unsigned PCLabelId = duplicateCPV(MF, CPI);
1232 MachineInstrBuilder MIB = BuildMI(MBB, I, Orig->getDebugLoc(), get(Opcode),
1234 .addConstantPoolIndex(CPI).addImm(PCLabelId);
1235 (*MIB).setMemRefs(Orig->memoperands_begin(), Orig->memoperands_end());
1242 ARMBaseInstrInfo::duplicate(MachineInstr *Orig, MachineFunction &MF) const {
1243 MachineInstr *MI = TargetInstrInfoImpl::duplicate(Orig, MF);
1244 switch(Orig->getOpcode()) {
1245 case ARM::tLDRpci_pic:
1246 case ARM::t2LDRpci_pic: {
1247 unsigned CPI = Orig->getOperand(1).getIndex();
1248 unsigned PCLabelId = duplicateCPV(MF, CPI);
1249 Orig->getOperand(1).setIndex(CPI);
1250 Orig->getOperand(2).setImm(PCLabelId);
1257 bool ARMBaseInstrInfo::produceSameValue(const MachineInstr *MI0,
1258 const MachineInstr *MI1) const {
1259 int Opcode = MI0->getOpcode();
1260 if (Opcode == ARM::t2LDRpci ||
1261 Opcode == ARM::t2LDRpci_pic ||
1262 Opcode == ARM::tLDRpci ||
1263 Opcode == ARM::tLDRpci_pic) {
1264 if (MI1->getOpcode() != Opcode)
1266 if (MI0->getNumOperands() != MI1->getNumOperands())
1269 const MachineOperand &MO0 = MI0->getOperand(1);
1270 const MachineOperand &MO1 = MI1->getOperand(1);
1271 if (MO0.getOffset() != MO1.getOffset())
1274 const MachineFunction *MF = MI0->getParent()->getParent();
1275 const MachineConstantPool *MCP = MF->getConstantPool();
1276 int CPI0 = MO0.getIndex();
1277 int CPI1 = MO1.getIndex();
1278 const MachineConstantPoolEntry &MCPE0 = MCP->getConstants()[CPI0];
1279 const MachineConstantPoolEntry &MCPE1 = MCP->getConstants()[CPI1];
1280 ARMConstantPoolValue *ACPV0 =
1281 static_cast<ARMConstantPoolValue*>(MCPE0.Val.MachineCPVal);
1282 ARMConstantPoolValue *ACPV1 =
1283 static_cast<ARMConstantPoolValue*>(MCPE1.Val.MachineCPVal);
1284 return ACPV0->hasSameValue(ACPV1);
1287 return MI0->isIdenticalTo(MI1, MachineInstr::IgnoreVRegDefs);
1290 /// getInstrPredicate - If instruction is predicated, returns its predicate
1291 /// condition, otherwise returns AL. It also returns the condition code
1292 /// register by reference.
1294 llvm::getInstrPredicate(const MachineInstr *MI, unsigned &PredReg) {
1295 int PIdx = MI->findFirstPredOperandIdx();
1301 PredReg = MI->getOperand(PIdx+1).getReg();
1302 return (ARMCC::CondCodes)MI->getOperand(PIdx).getImm();
1306 int llvm::getMatchingCondBranchOpcode(int Opc) {
1309 else if (Opc == ARM::tB)
1311 else if (Opc == ARM::t2B)
1314 llvm_unreachable("Unknown unconditional branch opcode!");
1319 void llvm::emitARMRegPlusImmediate(MachineBasicBlock &MBB,
1320 MachineBasicBlock::iterator &MBBI, DebugLoc dl,
1321 unsigned DestReg, unsigned BaseReg, int NumBytes,
1322 ARMCC::CondCodes Pred, unsigned PredReg,
1323 const ARMBaseInstrInfo &TII) {
1324 bool isSub = NumBytes < 0;
1325 if (isSub) NumBytes = -NumBytes;
1328 unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
1329 unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
1330 assert(ThisVal && "Didn't extract field correctly");
1332 // We will handle these bits from offset, clear them.
1333 NumBytes &= ~ThisVal;
1335 assert(ARM_AM::getSOImmVal(ThisVal) != -1 && "Bit extraction didn't work?");
1337 // Build the new ADD / SUB.
1338 unsigned Opc = isSub ? ARM::SUBri : ARM::ADDri;
1339 BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
1340 .addReg(BaseReg, RegState::Kill).addImm(ThisVal)
1341 .addImm((unsigned)Pred).addReg(PredReg).addReg(0);
1346 bool llvm::rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
1347 unsigned FrameReg, int &Offset,
1348 const ARMBaseInstrInfo &TII) {
1349 unsigned Opcode = MI.getOpcode();
1350 const TargetInstrDesc &Desc = MI.getDesc();
1351 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
1354 // Memory operands in inline assembly always use AddrMode2.
1355 if (Opcode == ARM::INLINEASM)
1356 AddrMode = ARMII::AddrMode2;
1358 if (Opcode == ARM::ADDri) {
1359 Offset += MI.getOperand(FrameRegIdx+1).getImm();
1361 // Turn it into a move.
1362 MI.setDesc(TII.get(ARM::MOVr));
1363 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1364 MI.RemoveOperand(FrameRegIdx+1);
1367 } else if (Offset < 0) {
1370 MI.setDesc(TII.get(ARM::SUBri));
1373 // Common case: small offset, fits into instruction.
1374 if (ARM_AM::getSOImmVal(Offset) != -1) {
1375 // Replace the FrameIndex with sp / fp
1376 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1377 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset);
1382 // Otherwise, pull as much of the immedidate into this ADDri/SUBri
1384 unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
1385 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
1387 // We will handle these bits from offset, clear them.
1388 Offset &= ~ThisImmVal;
1390 // Get the properly encoded SOImmVal field.
1391 assert(ARM_AM::getSOImmVal(ThisImmVal) != -1 &&
1392 "Bit extraction didn't work?");
1393 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(ThisImmVal);
1395 unsigned ImmIdx = 0;
1397 unsigned NumBits = 0;
1400 case ARMII::AddrMode2: {
1401 ImmIdx = FrameRegIdx+2;
1402 InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
1403 if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1408 case ARMII::AddrMode3: {
1409 ImmIdx = FrameRegIdx+2;
1410 InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
1411 if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1416 case ARMII::AddrMode4:
1417 case ARMII::AddrMode6:
1418 // Can't fold any offset even if it's zero.
1420 case ARMII::AddrMode5: {
1421 ImmIdx = FrameRegIdx+1;
1422 InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
1423 if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1430 llvm_unreachable("Unsupported addressing mode!");
1434 Offset += InstrOffs * Scale;
1435 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
1441 // Attempt to fold address comp. if opcode has offset bits
1443 // Common case: small offset, fits into instruction.
1444 MachineOperand &ImmOp = MI.getOperand(ImmIdx);
1445 int ImmedOffset = Offset / Scale;
1446 unsigned Mask = (1 << NumBits) - 1;
1447 if ((unsigned)Offset <= Mask * Scale) {
1448 // Replace the FrameIndex with sp
1449 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1451 ImmedOffset |= 1 << NumBits;
1452 ImmOp.ChangeToImmediate(ImmedOffset);
1457 // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
1458 ImmedOffset = ImmedOffset & Mask;
1460 ImmedOffset |= 1 << NumBits;
1461 ImmOp.ChangeToImmediate(ImmedOffset);
1462 Offset &= ~(Mask*Scale);
1466 Offset = (isSub) ? -Offset : Offset;