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/PseudoSourceValue.h"
32 #include "llvm/MC/MCAsmInfo.h"
33 #include "llvm/Support/CommandLine.h"
34 #include "llvm/Support/Debug.h"
35 #include "llvm/Support/ErrorHandling.h"
39 EnableARM3Addr("enable-arm-3-addr-conv", cl::Hidden,
40 cl::desc("Enable ARM 2-addr to 3-addr conv"));
42 ARMBaseInstrInfo::ARMBaseInstrInfo(const ARMSubtarget& STI)
43 : TargetInstrInfoImpl(ARMInsts, array_lengthof(ARMInsts)),
48 ARMBaseInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
49 MachineBasicBlock::iterator &MBBI,
50 LiveVariables *LV) const {
51 // FIXME: Thumb2 support.
56 MachineInstr *MI = MBBI;
57 MachineFunction &MF = *MI->getParent()->getParent();
58 unsigned TSFlags = MI->getDesc().TSFlags;
60 switch ((TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift) {
62 case ARMII::IndexModePre:
65 case ARMII::IndexModePost:
69 // Try splitting an indexed load/store to an un-indexed one plus an add/sub
71 unsigned MemOpc = getUnindexedOpcode(MI->getOpcode());
75 MachineInstr *UpdateMI = NULL;
76 MachineInstr *MemMI = NULL;
77 unsigned AddrMode = (TSFlags & ARMII::AddrModeMask);
78 const TargetInstrDesc &TID = MI->getDesc();
79 unsigned NumOps = TID.getNumOperands();
80 bool isLoad = !TID.mayStore();
81 const MachineOperand &WB = isLoad ? MI->getOperand(1) : MI->getOperand(0);
82 const MachineOperand &Base = MI->getOperand(2);
83 const MachineOperand &Offset = MI->getOperand(NumOps-3);
84 unsigned WBReg = WB.getReg();
85 unsigned BaseReg = Base.getReg();
86 unsigned OffReg = Offset.getReg();
87 unsigned OffImm = MI->getOperand(NumOps-2).getImm();
88 ARMCC::CondCodes Pred = (ARMCC::CondCodes)MI->getOperand(NumOps-1).getImm();
91 assert(false && "Unknown indexed op!");
93 case ARMII::AddrMode2: {
94 bool isSub = ARM_AM::getAM2Op(OffImm) == ARM_AM::sub;
95 unsigned Amt = ARM_AM::getAM2Offset(OffImm);
97 if (ARM_AM::getSOImmVal(Amt) == -1)
98 // Can't encode it in a so_imm operand. This transformation will
99 // add more than 1 instruction. Abandon!
101 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
102 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
103 .addReg(BaseReg).addImm(Amt)
104 .addImm(Pred).addReg(0).addReg(0);
105 } else if (Amt != 0) {
106 ARM_AM::ShiftOpc ShOpc = ARM_AM::getAM2ShiftOpc(OffImm);
107 unsigned SOOpc = ARM_AM::getSORegOpc(ShOpc, Amt);
108 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
109 get(isSub ? ARM::SUBrs : ARM::ADDrs), WBReg)
110 .addReg(BaseReg).addReg(OffReg).addReg(0).addImm(SOOpc)
111 .addImm(Pred).addReg(0).addReg(0);
113 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
114 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
115 .addReg(BaseReg).addReg(OffReg)
116 .addImm(Pred).addReg(0).addReg(0);
119 case ARMII::AddrMode3 : {
120 bool isSub = ARM_AM::getAM3Op(OffImm) == ARM_AM::sub;
121 unsigned Amt = ARM_AM::getAM3Offset(OffImm);
123 // Immediate is 8-bits. It's guaranteed to fit in a so_imm operand.
124 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
125 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
126 .addReg(BaseReg).addImm(Amt)
127 .addImm(Pred).addReg(0).addReg(0);
129 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
130 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
131 .addReg(BaseReg).addReg(OffReg)
132 .addImm(Pred).addReg(0).addReg(0);
137 std::vector<MachineInstr*> NewMIs;
140 MemMI = BuildMI(MF, MI->getDebugLoc(),
141 get(MemOpc), MI->getOperand(0).getReg())
142 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
144 MemMI = BuildMI(MF, MI->getDebugLoc(),
145 get(MemOpc)).addReg(MI->getOperand(1).getReg())
146 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
147 NewMIs.push_back(MemMI);
148 NewMIs.push_back(UpdateMI);
151 MemMI = BuildMI(MF, MI->getDebugLoc(),
152 get(MemOpc), MI->getOperand(0).getReg())
153 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
155 MemMI = BuildMI(MF, MI->getDebugLoc(),
156 get(MemOpc)).addReg(MI->getOperand(1).getReg())
157 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
159 UpdateMI->getOperand(0).setIsDead();
160 NewMIs.push_back(UpdateMI);
161 NewMIs.push_back(MemMI);
164 // Transfer LiveVariables states, kill / dead info.
166 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
167 MachineOperand &MO = MI->getOperand(i);
168 if (MO.isReg() && MO.getReg() &&
169 TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
170 unsigned Reg = MO.getReg();
172 LiveVariables::VarInfo &VI = LV->getVarInfo(Reg);
174 MachineInstr *NewMI = (Reg == WBReg) ? UpdateMI : MemMI;
176 LV->addVirtualRegisterDead(Reg, NewMI);
178 if (MO.isUse() && MO.isKill()) {
179 for (unsigned j = 0; j < 2; ++j) {
180 // Look at the two new MI's in reverse order.
181 MachineInstr *NewMI = NewMIs[j];
182 if (!NewMI->readsRegister(Reg))
184 LV->addVirtualRegisterKilled(Reg, NewMI);
185 if (VI.removeKill(MI))
186 VI.Kills.push_back(NewMI);
194 MFI->insert(MBBI, NewMIs[1]);
195 MFI->insert(MBBI, NewMIs[0]);
201 ARMBaseInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
202 MachineBasicBlock *&FBB,
203 SmallVectorImpl<MachineOperand> &Cond,
204 bool AllowModify) const {
205 // If the block has no terminators, it just falls into the block after it.
206 MachineBasicBlock::iterator I = MBB.end();
207 if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
210 // Get the last instruction in the block.
211 MachineInstr *LastInst = I;
213 // If there is only one terminator instruction, process it.
214 unsigned LastOpc = LastInst->getOpcode();
215 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
216 if (isUncondBranchOpcode(LastOpc)) {
217 TBB = LastInst->getOperand(0).getMBB();
220 if (isCondBranchOpcode(LastOpc)) {
221 // Block ends with fall-through condbranch.
222 TBB = LastInst->getOperand(0).getMBB();
223 Cond.push_back(LastInst->getOperand(1));
224 Cond.push_back(LastInst->getOperand(2));
227 return true; // Can't handle indirect branch.
230 // Get the instruction before it if it is a terminator.
231 MachineInstr *SecondLastInst = I;
233 // If there are three terminators, we don't know what sort of block this is.
234 if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
237 // If the block ends with a B and a Bcc, handle it.
238 unsigned SecondLastOpc = SecondLastInst->getOpcode();
239 if (isCondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
240 TBB = SecondLastInst->getOperand(0).getMBB();
241 Cond.push_back(SecondLastInst->getOperand(1));
242 Cond.push_back(SecondLastInst->getOperand(2));
243 FBB = LastInst->getOperand(0).getMBB();
247 // If the block ends with two unconditional branches, handle it. The second
248 // one is not executed, so remove it.
249 if (isUncondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
250 TBB = SecondLastInst->getOperand(0).getMBB();
253 I->eraseFromParent();
257 // ...likewise if it ends with a branch table followed by an unconditional
258 // branch. The branch folder can create these, and we must get rid of them for
259 // correctness of Thumb constant islands.
260 if ((isJumpTableBranchOpcode(SecondLastOpc) ||
261 isIndirectBranchOpcode(SecondLastOpc)) &&
262 isUncondBranchOpcode(LastOpc)) {
265 I->eraseFromParent();
269 // Otherwise, can't handle this.
274 unsigned ARMBaseInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
275 MachineBasicBlock::iterator I = MBB.end();
276 if (I == MBB.begin()) return 0;
278 if (!isUncondBranchOpcode(I->getOpcode()) &&
279 !isCondBranchOpcode(I->getOpcode()))
282 // Remove the branch.
283 I->eraseFromParent();
287 if (I == MBB.begin()) return 1;
289 if (!isCondBranchOpcode(I->getOpcode()))
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();
304 ARMFunctionInfo *AFI = MBB.getParent()->getInfo<ARMFunctionInfo>();
305 int BOpc = !AFI->isThumbFunction()
306 ? ARM::B : (AFI->isThumb2Function() ? ARM::t2B : ARM::tB);
307 int BccOpc = !AFI->isThumbFunction()
308 ? ARM::Bcc : (AFI->isThumb2Function() ? ARM::t2Bcc : ARM::tBcc);
310 // Shouldn't be a fall through.
311 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
312 assert((Cond.size() == 2 || Cond.size() == 0) &&
313 "ARM branch conditions have two components!");
316 if (Cond.empty()) // Unconditional branch?
317 BuildMI(&MBB, dl, get(BOpc)).addMBB(TBB);
319 BuildMI(&MBB, dl, get(BccOpc)).addMBB(TBB)
320 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
324 // Two-way conditional branch.
325 BuildMI(&MBB, dl, get(BccOpc)).addMBB(TBB)
326 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
327 BuildMI(&MBB, dl, get(BOpc)).addMBB(FBB);
331 bool ARMBaseInstrInfo::
332 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
333 ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm();
334 Cond[0].setImm(ARMCC::getOppositeCondition(CC));
338 bool ARMBaseInstrInfo::
339 PredicateInstruction(MachineInstr *MI,
340 const SmallVectorImpl<MachineOperand> &Pred) const {
341 unsigned Opc = MI->getOpcode();
342 if (isUncondBranchOpcode(Opc)) {
343 MI->setDesc(get(getMatchingCondBranchOpcode(Opc)));
344 MI->addOperand(MachineOperand::CreateImm(Pred[0].getImm()));
345 MI->addOperand(MachineOperand::CreateReg(Pred[1].getReg(), false));
349 int PIdx = MI->findFirstPredOperandIdx();
351 MachineOperand &PMO = MI->getOperand(PIdx);
352 PMO.setImm(Pred[0].getImm());
353 MI->getOperand(PIdx+1).setReg(Pred[1].getReg());
359 bool ARMBaseInstrInfo::
360 SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
361 const SmallVectorImpl<MachineOperand> &Pred2) const {
362 if (Pred1.size() > 2 || Pred2.size() > 2)
365 ARMCC::CondCodes CC1 = (ARMCC::CondCodes)Pred1[0].getImm();
366 ARMCC::CondCodes CC2 = (ARMCC::CondCodes)Pred2[0].getImm();
376 return CC2 == ARMCC::HI;
378 return CC2 == ARMCC::LO || CC2 == ARMCC::EQ;
380 return CC2 == ARMCC::GT;
382 return CC2 == ARMCC::LT;
386 bool ARMBaseInstrInfo::DefinesPredicate(MachineInstr *MI,
387 std::vector<MachineOperand> &Pred) const {
388 // FIXME: This confuses implicit_def with optional CPSR def.
389 const TargetInstrDesc &TID = MI->getDesc();
390 if (!TID.getImplicitDefs() && !TID.hasOptionalDef())
394 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
395 const MachineOperand &MO = MI->getOperand(i);
396 if (MO.isReg() && MO.getReg() == ARM::CPSR) {
406 /// FIXME: Works around a gcc miscompilation with -fstrict-aliasing
407 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
408 unsigned JTI) DISABLE_INLINE;
409 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
411 return JT[JTI].MBBs.size();
414 /// GetInstSize - Return the size of the specified MachineInstr.
416 unsigned ARMBaseInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
417 const MachineBasicBlock &MBB = *MI->getParent();
418 const MachineFunction *MF = MBB.getParent();
419 const MCAsmInfo *MAI = MF->getTarget().getMCAsmInfo();
421 // Basic size info comes from the TSFlags field.
422 const TargetInstrDesc &TID = MI->getDesc();
423 unsigned TSFlags = TID.TSFlags;
425 unsigned Opc = MI->getOpcode();
426 switch ((TSFlags & ARMII::SizeMask) >> ARMII::SizeShift) {
428 // If this machine instr is an inline asm, measure it.
429 if (MI->getOpcode() == ARM::INLINEASM)
430 return getInlineAsmLength(MI->getOperand(0).getSymbolName(), *MAI);
435 llvm_unreachable("Unknown or unset size field for instr!");
436 case TargetInstrInfo::IMPLICIT_DEF:
437 case TargetInstrInfo::KILL:
438 case TargetInstrInfo::DBG_LABEL:
439 case TargetInstrInfo::EH_LABEL:
444 case ARMII::Size8Bytes: return 8; // ARM instruction x 2.
445 case ARMII::Size4Bytes: return 4; // ARM / Thumb2 instruction.
446 case ARMII::Size2Bytes: return 2; // Thumb1 instruction.
447 case ARMII::SizeSpecial: {
449 case ARM::CONSTPOOL_ENTRY:
450 // If this machine instr is a constant pool entry, its size is recorded as
452 return MI->getOperand(2).getImm();
453 case ARM::Int_eh_sjlj_setjmp:
455 case ARM::t2Int_eh_sjlj_setjmp:
464 // These are jumptable branches, i.e. a branch followed by an inlined
465 // jumptable. The size is 4 + 4 * number of entries. For TBB, each
466 // entry is one byte; TBH two byte each.
467 unsigned EntrySize = (Opc == ARM::t2TBB)
468 ? 1 : ((Opc == ARM::t2TBH) ? 2 : 4);
469 unsigned NumOps = TID.getNumOperands();
470 MachineOperand JTOP =
471 MI->getOperand(NumOps - (TID.isPredicable() ? 3 : 2));
472 unsigned JTI = JTOP.getIndex();
473 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
474 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
475 assert(JTI < JT.size());
476 // Thumb instructions are 2 byte aligned, but JT entries are 4 byte
477 // 4 aligned. The assembler / linker may add 2 byte padding just before
478 // the JT entries. The size does not include this padding; the
479 // constant islands pass does separate bookkeeping for it.
480 // FIXME: If we know the size of the function is less than (1 << 16) *2
481 // bytes, we can use 16-bit entries instead. Then there won't be an
483 unsigned InstSize = (Opc == ARM::tBR_JTr || Opc == ARM::t2BR_JT) ? 2 : 4;
484 unsigned NumEntries = getNumJTEntries(JT, JTI);
485 if (Opc == ARM::t2TBB && (NumEntries & 1))
486 // Make sure the instruction that follows TBB is 2-byte aligned.
487 // FIXME: Constant island pass should insert an "ALIGN" instruction
490 return NumEntries * EntrySize + InstSize;
493 // Otherwise, pseudo-instruction sizes are zero.
498 return 0; // Not reached
501 /// Return true if the instruction is a register to register move and
502 /// leave the source and dest operands in the passed parameters.
505 ARMBaseInstrInfo::isMoveInstr(const MachineInstr &MI,
506 unsigned &SrcReg, unsigned &DstReg,
507 unsigned& SrcSubIdx, unsigned& DstSubIdx) const {
508 SrcSubIdx = DstSubIdx = 0; // No sub-registers.
510 switch (MI.getOpcode()) {
516 SrcReg = MI.getOperand(1).getReg();
517 DstReg = MI.getOperand(0).getReg();
522 case ARM::tMOVgpr2tgpr:
523 case ARM::tMOVtgpr2gpr:
524 case ARM::tMOVgpr2gpr:
526 assert(MI.getDesc().getNumOperands() >= 2 &&
527 MI.getOperand(0).isReg() &&
528 MI.getOperand(1).isReg() &&
529 "Invalid ARM MOV instruction");
530 SrcReg = MI.getOperand(1).getReg();
531 DstReg = MI.getOperand(0).getReg();
540 ARMBaseInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
541 int &FrameIndex) const {
542 switch (MI->getOpcode()) {
545 case ARM::t2LDRs: // FIXME: don't use t2LDRs to access frame.
546 if (MI->getOperand(1).isFI() &&
547 MI->getOperand(2).isReg() &&
548 MI->getOperand(3).isImm() &&
549 MI->getOperand(2).getReg() == 0 &&
550 MI->getOperand(3).getImm() == 0) {
551 FrameIndex = MI->getOperand(1).getIndex();
552 return MI->getOperand(0).getReg();
557 if (MI->getOperand(1).isFI() &&
558 MI->getOperand(2).isImm() &&
559 MI->getOperand(2).getImm() == 0) {
560 FrameIndex = MI->getOperand(1).getIndex();
561 return MI->getOperand(0).getReg();
566 if (MI->getOperand(1).isFI() &&
567 MI->getOperand(2).isImm() &&
568 MI->getOperand(2).getImm() == 0) {
569 FrameIndex = MI->getOperand(1).getIndex();
570 return MI->getOperand(0).getReg();
579 ARMBaseInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
580 int &FrameIndex) const {
581 switch (MI->getOpcode()) {
584 case ARM::t2STRs: // FIXME: don't use t2STRs to access frame.
585 if (MI->getOperand(1).isFI() &&
586 MI->getOperand(2).isReg() &&
587 MI->getOperand(3).isImm() &&
588 MI->getOperand(2).getReg() == 0 &&
589 MI->getOperand(3).getImm() == 0) {
590 FrameIndex = MI->getOperand(1).getIndex();
591 return MI->getOperand(0).getReg();
596 if (MI->getOperand(1).isFI() &&
597 MI->getOperand(2).isImm() &&
598 MI->getOperand(2).getImm() == 0) {
599 FrameIndex = MI->getOperand(1).getIndex();
600 return MI->getOperand(0).getReg();
605 if (MI->getOperand(1).isFI() &&
606 MI->getOperand(2).isImm() &&
607 MI->getOperand(2).getImm() == 0) {
608 FrameIndex = MI->getOperand(1).getIndex();
609 return MI->getOperand(0).getReg();
618 ARMBaseInstrInfo::copyRegToReg(MachineBasicBlock &MBB,
619 MachineBasicBlock::iterator I,
620 unsigned DestReg, unsigned SrcReg,
621 const TargetRegisterClass *DestRC,
622 const TargetRegisterClass *SrcRC) const {
623 DebugLoc DL = DebugLoc::getUnknownLoc();
624 if (I != MBB.end()) DL = I->getDebugLoc();
626 if (DestRC != SrcRC) {
627 if (DestRC->getSize() != SrcRC->getSize())
630 // Allow DPR / DPR_VFP2 / DPR_8 cross-class copies.
631 // Allow QPR / QPR_VFP2 / QPR_8 cross-class copies.
632 if (DestRC->getSize() != 8 && DestRC->getSize() != 16)
636 if (DestRC == ARM::GPRRegisterClass) {
637 AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::MOVr),
638 DestReg).addReg(SrcReg)));
639 } else if (DestRC == ARM::SPRRegisterClass) {
640 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FCPYS), DestReg)
642 } else if (DestRC == ARM::DPRRegisterClass) {
643 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FCPYD), DestReg)
645 } else if (DestRC == ARM::DPR_VFP2RegisterClass ||
646 DestRC == ARM::DPR_8RegisterClass ||
647 SrcRC == ARM::DPR_VFP2RegisterClass ||
648 SrcRC == ARM::DPR_8RegisterClass) {
649 // Always use neon reg-reg move if source or dest is NEON-only regclass.
650 BuildMI(MBB, I, DL, get(ARM::VMOVD), DestReg).addReg(SrcReg);
651 } else if (DestRC == ARM::QPRRegisterClass ||
652 DestRC == ARM::QPR_VFP2RegisterClass ||
653 DestRC == ARM::QPR_8RegisterClass) {
654 BuildMI(MBB, I, DL, get(ARM::VMOVQ), DestReg).addReg(SrcReg);
662 void ARMBaseInstrInfo::
663 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
664 unsigned SrcReg, bool isKill, int FI,
665 const TargetRegisterClass *RC) const {
666 DebugLoc DL = DebugLoc::getUnknownLoc();
667 if (I != MBB.end()) DL = I->getDebugLoc();
668 MachineFunction &MF = *MBB.getParent();
669 MachineFrameInfo &MFI = *MF.getFrameInfo();
671 MachineMemOperand *MMO =
672 MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
673 MachineMemOperand::MOStore, 0,
674 MFI.getObjectSize(FI),
675 MFI.getObjectAlignment(FI));
677 if (RC == ARM::GPRRegisterClass) {
678 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::STR))
679 .addReg(SrcReg, getKillRegState(isKill))
680 .addFrameIndex(FI).addReg(0).addImm(0).addMemOperand(MMO));
681 } else if (RC == ARM::DPRRegisterClass ||
682 RC == ARM::DPR_VFP2RegisterClass ||
683 RC == ARM::DPR_8RegisterClass) {
684 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FSTD))
685 .addReg(SrcReg, getKillRegState(isKill))
686 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
687 } else if (RC == ARM::SPRRegisterClass) {
688 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FSTS))
689 .addReg(SrcReg, getKillRegState(isKill))
690 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
692 assert((RC == ARM::QPRRegisterClass ||
693 RC == ARM::QPR_VFP2RegisterClass) && "Unknown regclass!");
694 // FIXME: Neon instructions should support predicates
695 BuildMI(MBB, I, DL, get(ARM::VSTRQ)).addReg(SrcReg, getKillRegState(isKill))
696 .addFrameIndex(FI).addImm(0).addMemOperand(MMO);
700 void ARMBaseInstrInfo::
701 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
702 unsigned DestReg, int FI,
703 const TargetRegisterClass *RC) const {
704 DebugLoc DL = DebugLoc::getUnknownLoc();
705 if (I != MBB.end()) DL = I->getDebugLoc();
706 MachineFunction &MF = *MBB.getParent();
707 MachineFrameInfo &MFI = *MF.getFrameInfo();
709 MachineMemOperand *MMO =
710 MF.getMachineMemOperand(PseudoSourceValue::getFixedStack(FI),
711 MachineMemOperand::MOLoad, 0,
712 MFI.getObjectSize(FI),
713 MFI.getObjectAlignment(FI));
715 if (RC == ARM::GPRRegisterClass) {
716 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::LDR), DestReg)
717 .addFrameIndex(FI).addReg(0).addImm(0).addMemOperand(MMO));
718 } else if (RC == ARM::DPRRegisterClass ||
719 RC == ARM::DPR_VFP2RegisterClass ||
720 RC == ARM::DPR_8RegisterClass) {
721 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FLDD), DestReg)
722 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
723 } else if (RC == ARM::SPRRegisterClass) {
724 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::FLDS), DestReg)
725 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
727 assert((RC == ARM::QPRRegisterClass ||
728 RC == ARM::QPR_VFP2RegisterClass ||
729 RC == ARM::QPR_8RegisterClass) && "Unknown regclass!");
730 // FIXME: Neon instructions should support predicates
731 BuildMI(MBB, I, DL, get(ARM::VLDRQ), DestReg).addFrameIndex(FI).addImm(0).
736 MachineInstr *ARMBaseInstrInfo::
737 foldMemoryOperandImpl(MachineFunction &MF, MachineInstr *MI,
738 const SmallVectorImpl<unsigned> &Ops, int FI) const {
739 if (Ops.size() != 1) return NULL;
741 unsigned OpNum = Ops[0];
742 unsigned Opc = MI->getOpcode();
743 MachineInstr *NewMI = NULL;
744 if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) {
745 // If it is updating CPSR, then it cannot be folded.
746 if (MI->getOperand(4).getReg() == ARM::CPSR && !MI->getOperand(4).isDead())
748 unsigned Pred = MI->getOperand(2).getImm();
749 unsigned PredReg = MI->getOperand(3).getReg();
750 if (OpNum == 0) { // move -> store
751 unsigned SrcReg = MI->getOperand(1).getReg();
752 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
753 bool isKill = MI->getOperand(1).isKill();
754 bool isUndef = MI->getOperand(1).isUndef();
755 if (Opc == ARM::MOVr)
756 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::STR))
758 getKillRegState(isKill) | getUndefRegState(isUndef),
760 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
762 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2STRi12))
764 getKillRegState(isKill) | getUndefRegState(isUndef),
766 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
767 } else { // move -> load
768 unsigned DstReg = MI->getOperand(0).getReg();
769 unsigned DstSubReg = MI->getOperand(0).getSubReg();
770 bool isDead = MI->getOperand(0).isDead();
771 bool isUndef = MI->getOperand(0).isUndef();
772 if (Opc == ARM::MOVr)
773 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::LDR))
776 getDeadRegState(isDead) |
777 getUndefRegState(isUndef), DstSubReg)
778 .addFrameIndex(FI).addReg(0).addImm(0).addImm(Pred).addReg(PredReg);
780 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2LDRi12))
783 getDeadRegState(isDead) |
784 getUndefRegState(isUndef), DstSubReg)
785 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
787 } else if (Opc == ARM::tMOVgpr2gpr ||
788 Opc == ARM::tMOVtgpr2gpr ||
789 Opc == ARM::tMOVgpr2tgpr) {
790 if (OpNum == 0) { // move -> store
791 unsigned SrcReg = MI->getOperand(1).getReg();
792 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
793 bool isKill = MI->getOperand(1).isKill();
794 bool isUndef = MI->getOperand(1).isUndef();
795 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2STRi12))
797 getKillRegState(isKill) | getUndefRegState(isUndef),
799 .addFrameIndex(FI).addImm(0).addImm(ARMCC::AL).addReg(0);
800 } else { // move -> load
801 unsigned DstReg = MI->getOperand(0).getReg();
802 unsigned DstSubReg = MI->getOperand(0).getSubReg();
803 bool isDead = MI->getOperand(0).isDead();
804 bool isUndef = MI->getOperand(0).isUndef();
805 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::t2LDRi12))
808 getDeadRegState(isDead) |
809 getUndefRegState(isUndef),
811 .addFrameIndex(FI).addImm(0).addImm(ARMCC::AL).addReg(0);
813 } else if (Opc == ARM::FCPYS) {
814 unsigned Pred = MI->getOperand(2).getImm();
815 unsigned PredReg = MI->getOperand(3).getReg();
816 if (OpNum == 0) { // move -> store
817 unsigned SrcReg = MI->getOperand(1).getReg();
818 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
819 bool isKill = MI->getOperand(1).isKill();
820 bool isUndef = MI->getOperand(1).isUndef();
821 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTS))
822 .addReg(SrcReg, getKillRegState(isKill) | getUndefRegState(isUndef),
825 .addImm(0).addImm(Pred).addReg(PredReg);
826 } else { // move -> load
827 unsigned DstReg = MI->getOperand(0).getReg();
828 unsigned DstSubReg = MI->getOperand(0).getSubReg();
829 bool isDead = MI->getOperand(0).isDead();
830 bool isUndef = MI->getOperand(0).isUndef();
831 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDS))
834 getDeadRegState(isDead) |
835 getUndefRegState(isUndef),
837 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
840 else if (Opc == ARM::FCPYD) {
841 unsigned Pred = MI->getOperand(2).getImm();
842 unsigned PredReg = MI->getOperand(3).getReg();
843 if (OpNum == 0) { // move -> store
844 unsigned SrcReg = MI->getOperand(1).getReg();
845 unsigned SrcSubReg = MI->getOperand(1).getSubReg();
846 bool isKill = MI->getOperand(1).isKill();
847 bool isUndef = MI->getOperand(1).isUndef();
848 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FSTD))
850 getKillRegState(isKill) | getUndefRegState(isUndef),
852 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
853 } else { // move -> load
854 unsigned DstReg = MI->getOperand(0).getReg();
855 unsigned DstSubReg = MI->getOperand(0).getSubReg();
856 bool isDead = MI->getOperand(0).isDead();
857 bool isUndef = MI->getOperand(0).isUndef();
858 NewMI = BuildMI(MF, MI->getDebugLoc(), get(ARM::FLDD))
861 getDeadRegState(isDead) |
862 getUndefRegState(isUndef),
864 .addFrameIndex(FI).addImm(0).addImm(Pred).addReg(PredReg);
872 ARMBaseInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
874 const SmallVectorImpl<unsigned> &Ops,
875 MachineInstr* LoadMI) const {
881 ARMBaseInstrInfo::canFoldMemoryOperand(const MachineInstr *MI,
882 const SmallVectorImpl<unsigned> &Ops) const {
883 if (Ops.size() != 1) return false;
885 unsigned Opc = MI->getOpcode();
886 if (Opc == ARM::MOVr || Opc == ARM::t2MOVr) {
887 // If it is updating CPSR, then it cannot be folded.
888 return MI->getOperand(4).getReg() != ARM::CPSR ||
889 MI->getOperand(4).isDead();
890 } else if (Opc == ARM::tMOVgpr2gpr ||
891 Opc == ARM::tMOVtgpr2gpr ||
892 Opc == ARM::tMOVgpr2tgpr) {
894 } else if (Opc == ARM::FCPYS || Opc == ARM::FCPYD) {
896 } else if (Opc == ARM::VMOVD || Opc == ARM::VMOVQ) {
897 return false; // FIXME
903 void ARMBaseInstrInfo::
904 reMaterialize(MachineBasicBlock &MBB,
905 MachineBasicBlock::iterator I,
906 unsigned DestReg, unsigned SubIdx,
907 const MachineInstr *Orig) const {
908 DebugLoc dl = Orig->getDebugLoc();
909 unsigned Opcode = Orig->getOpcode();
912 MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
913 MI->getOperand(0).setReg(DestReg);
917 case ARM::tLDRpci_pic:
918 case ARM::t2LDRpci_pic: {
919 MachineFunction &MF = *MBB.getParent();
920 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
921 MachineConstantPool *MCP = MF.getConstantPool();
922 unsigned CPI = Orig->getOperand(1).getIndex();
923 const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPI];
924 assert(MCPE.isMachineConstantPoolEntry() &&
925 "Expecting a machine constantpool entry!");
926 ARMConstantPoolValue *ACPV =
927 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
928 unsigned PCLabelId = AFI->createConstPoolEntryUId();
929 ARMConstantPoolValue *NewCPV = 0;
930 if (ACPV->isGlobalValue())
931 NewCPV = new ARMConstantPoolValue(ACPV->getGV(), PCLabelId,
933 else if (ACPV->isExtSymbol())
934 NewCPV = new ARMConstantPoolValue(MF.getFunction()->getContext(),
935 ACPV->getSymbol(), PCLabelId, 4);
936 else if (ACPV->isBlockAddress())
937 NewCPV = new ARMConstantPoolValue(ACPV->getBlockAddress(), PCLabelId,
938 ARMCP::CPBlockAddress, 4);
940 llvm_unreachable("Unexpected ARM constantpool value type!!");
941 CPI = MCP->getConstantPoolIndex(NewCPV, MCPE.getAlignment());
942 MachineInstrBuilder MIB = BuildMI(MBB, I, Orig->getDebugLoc(), get(Opcode),
944 .addConstantPoolIndex(CPI).addImm(PCLabelId);
945 (*MIB).setMemRefs(Orig->memoperands_begin(), Orig->memoperands_end());
950 MachineInstr *NewMI = prior(I);
951 NewMI->getOperand(0).setSubReg(SubIdx);
954 bool ARMBaseInstrInfo::isIdentical(const MachineInstr *MI0,
955 const MachineInstr *MI1,
956 const MachineRegisterInfo *MRI) const {
957 int Opcode = MI0->getOpcode();
958 if (Opcode == ARM::t2LDRpci_pic || Opcode == ARM::tLDRpci_pic) {
959 if (MI1->getOpcode() != Opcode)
961 if (MI0->getNumOperands() != MI1->getNumOperands())
964 const MachineOperand &MO0 = MI0->getOperand(1);
965 const MachineOperand &MO1 = MI1->getOperand(1);
966 if (MO0.getOffset() != MO1.getOffset())
969 const MachineFunction *MF = MI0->getParent()->getParent();
970 const MachineConstantPool *MCP = MF->getConstantPool();
971 int CPI0 = MO0.getIndex();
972 int CPI1 = MO1.getIndex();
973 const MachineConstantPoolEntry &MCPE0 = MCP->getConstants()[CPI0];
974 const MachineConstantPoolEntry &MCPE1 = MCP->getConstants()[CPI1];
975 ARMConstantPoolValue *ACPV0 =
976 static_cast<ARMConstantPoolValue*>(MCPE0.Val.MachineCPVal);
977 ARMConstantPoolValue *ACPV1 =
978 static_cast<ARMConstantPoolValue*>(MCPE1.Val.MachineCPVal);
979 return ACPV0->hasSameValue(ACPV1);
982 return TargetInstrInfoImpl::isIdentical(MI0, MI1, MRI);
985 /// getInstrPredicate - If instruction is predicated, returns its predicate
986 /// condition, otherwise returns AL. It also returns the condition code
987 /// register by reference.
989 llvm::getInstrPredicate(const MachineInstr *MI, unsigned &PredReg) {
990 int PIdx = MI->findFirstPredOperandIdx();
996 PredReg = MI->getOperand(PIdx+1).getReg();
997 return (ARMCC::CondCodes)MI->getOperand(PIdx).getImm();
1001 int llvm::getMatchingCondBranchOpcode(int Opc) {
1004 else if (Opc == ARM::tB)
1006 else if (Opc == ARM::t2B)
1009 llvm_unreachable("Unknown unconditional branch opcode!");
1014 void llvm::emitARMRegPlusImmediate(MachineBasicBlock &MBB,
1015 MachineBasicBlock::iterator &MBBI, DebugLoc dl,
1016 unsigned DestReg, unsigned BaseReg, int NumBytes,
1017 ARMCC::CondCodes Pred, unsigned PredReg,
1018 const ARMBaseInstrInfo &TII) {
1019 bool isSub = NumBytes < 0;
1020 if (isSub) NumBytes = -NumBytes;
1023 unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
1024 unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
1025 assert(ThisVal && "Didn't extract field correctly");
1027 // We will handle these bits from offset, clear them.
1028 NumBytes &= ~ThisVal;
1030 assert(ARM_AM::getSOImmVal(ThisVal) != -1 && "Bit extraction didn't work?");
1032 // Build the new ADD / SUB.
1033 unsigned Opc = isSub ? ARM::SUBri : ARM::ADDri;
1034 BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
1035 .addReg(BaseReg, RegState::Kill).addImm(ThisVal)
1036 .addImm((unsigned)Pred).addReg(PredReg).addReg(0);
1041 bool llvm::rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
1042 unsigned FrameReg, int &Offset,
1043 const ARMBaseInstrInfo &TII) {
1044 unsigned Opcode = MI.getOpcode();
1045 const TargetInstrDesc &Desc = MI.getDesc();
1046 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
1049 // Memory operands in inline assembly always use AddrMode2.
1050 if (Opcode == ARM::INLINEASM)
1051 AddrMode = ARMII::AddrMode2;
1053 if (Opcode == ARM::ADDri) {
1054 Offset += MI.getOperand(FrameRegIdx+1).getImm();
1056 // Turn it into a move.
1057 MI.setDesc(TII.get(ARM::MOVr));
1058 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1059 MI.RemoveOperand(FrameRegIdx+1);
1062 } else if (Offset < 0) {
1065 MI.setDesc(TII.get(ARM::SUBri));
1068 // Common case: small offset, fits into instruction.
1069 if (ARM_AM::getSOImmVal(Offset) != -1) {
1070 // Replace the FrameIndex with sp / fp
1071 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1072 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset);
1077 // Otherwise, pull as much of the immedidate into this ADDri/SUBri
1079 unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
1080 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
1082 // We will handle these bits from offset, clear them.
1083 Offset &= ~ThisImmVal;
1085 // Get the properly encoded SOImmVal field.
1086 assert(ARM_AM::getSOImmVal(ThisImmVal) != -1 &&
1087 "Bit extraction didn't work?");
1088 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(ThisImmVal);
1090 unsigned ImmIdx = 0;
1092 unsigned NumBits = 0;
1095 case ARMII::AddrMode2: {
1096 ImmIdx = FrameRegIdx+2;
1097 InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
1098 if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1103 case ARMII::AddrMode3: {
1104 ImmIdx = FrameRegIdx+2;
1105 InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
1106 if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1111 case ARMII::AddrMode4:
1112 // Can't fold any offset even if it's zero.
1114 case ARMII::AddrMode5: {
1115 ImmIdx = FrameRegIdx+1;
1116 InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
1117 if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1124 llvm_unreachable("Unsupported addressing mode!");
1128 Offset += InstrOffs * Scale;
1129 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
1135 // Attempt to fold address comp. if opcode has offset bits
1137 // Common case: small offset, fits into instruction.
1138 MachineOperand &ImmOp = MI.getOperand(ImmIdx);
1139 int ImmedOffset = Offset / Scale;
1140 unsigned Mask = (1 << NumBits) - 1;
1141 if ((unsigned)Offset <= Mask * Scale) {
1142 // Replace the FrameIndex with sp
1143 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1145 ImmedOffset |= 1 << NumBits;
1146 ImmOp.ChangeToImmediate(ImmedOffset);
1151 // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
1152 ImmedOffset = ImmedOffset & Mask;
1154 ImmedOffset |= 1 << NumBits;
1155 ImmOp.ChangeToImmediate(ImmedOffset);
1156 Offset &= ~(Mask*Scale);
1160 Offset = (isSub) ? -Offset : Offset;