1 //===-- ARMBaseInstrInfo.cpp - ARM Instruction Information ----------------===//
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 "ARMBaseRegisterInfo.h"
17 #include "ARMConstantPoolValue.h"
18 #include "ARMHazardRecognizer.h"
19 #include "ARMMachineFunctionInfo.h"
20 #include "MCTargetDesc/ARMAddressingModes.h"
21 #include "llvm/Constants.h"
22 #include "llvm/Function.h"
23 #include "llvm/GlobalValue.h"
24 #include "llvm/CodeGen/LiveVariables.h"
25 #include "llvm/CodeGen/MachineConstantPool.h"
26 #include "llvm/CodeGen/MachineFrameInfo.h"
27 #include "llvm/CodeGen/MachineInstrBuilder.h"
28 #include "llvm/CodeGen/MachineJumpTableInfo.h"
29 #include "llvm/CodeGen/MachineMemOperand.h"
30 #include "llvm/CodeGen/MachineRegisterInfo.h"
31 #include "llvm/CodeGen/SelectionDAGNodes.h"
32 #include "llvm/MC/MCAsmInfo.h"
33 #include "llvm/Support/BranchProbability.h"
34 #include "llvm/Support/CommandLine.h"
35 #include "llvm/Support/Debug.h"
36 #include "llvm/Support/ErrorHandling.h"
37 #include "llvm/ADT/STLExtras.h"
39 #define GET_INSTRINFO_CTOR
40 #include "ARMGenInstrInfo.inc"
45 EnableARM3Addr("enable-arm-3-addr-conv", cl::Hidden,
46 cl::desc("Enable ARM 2-addr to 3-addr conv"));
49 WidenVMOVS("widen-vmovs", cl::Hidden, cl::init(true),
50 cl::desc("Widen ARM vmovs to vmovd when possible"));
52 static cl::opt<unsigned>
53 SwiftPartialUpdateClearance("swift-partial-update-clearance",
54 cl::Hidden, cl::init(12),
55 cl::desc("Clearance before partial register updates"));
57 /// ARM_MLxEntry - Record information about MLA / MLS instructions.
59 uint16_t MLxOpc; // MLA / MLS opcode
60 uint16_t MulOpc; // Expanded multiplication opcode
61 uint16_t AddSubOpc; // Expanded add / sub opcode
62 bool NegAcc; // True if the acc is negated before the add / sub.
63 bool HasLane; // True if instruction has an extra "lane" operand.
66 static const ARM_MLxEntry ARM_MLxTable[] = {
67 // MLxOpc, MulOpc, AddSubOpc, NegAcc, HasLane
69 { ARM::VMLAS, ARM::VMULS, ARM::VADDS, false, false },
70 { ARM::VMLSS, ARM::VMULS, ARM::VSUBS, false, false },
71 { ARM::VMLAD, ARM::VMULD, ARM::VADDD, false, false },
72 { ARM::VMLSD, ARM::VMULD, ARM::VSUBD, false, false },
73 { ARM::VNMLAS, ARM::VNMULS, ARM::VSUBS, true, false },
74 { ARM::VNMLSS, ARM::VMULS, ARM::VSUBS, true, false },
75 { ARM::VNMLAD, ARM::VNMULD, ARM::VSUBD, true, false },
76 { ARM::VNMLSD, ARM::VMULD, ARM::VSUBD, true, false },
79 { ARM::VMLAfd, ARM::VMULfd, ARM::VADDfd, false, false },
80 { ARM::VMLSfd, ARM::VMULfd, ARM::VSUBfd, false, false },
81 { ARM::VMLAfq, ARM::VMULfq, ARM::VADDfq, false, false },
82 { ARM::VMLSfq, ARM::VMULfq, ARM::VSUBfq, false, false },
83 { ARM::VMLAslfd, ARM::VMULslfd, ARM::VADDfd, false, true },
84 { ARM::VMLSslfd, ARM::VMULslfd, ARM::VSUBfd, false, true },
85 { ARM::VMLAslfq, ARM::VMULslfq, ARM::VADDfq, false, true },
86 { ARM::VMLSslfq, ARM::VMULslfq, ARM::VSUBfq, false, true },
89 ARMBaseInstrInfo::ARMBaseInstrInfo(const ARMSubtarget& STI)
90 : ARMGenInstrInfo(ARM::ADJCALLSTACKDOWN, ARM::ADJCALLSTACKUP),
92 for (unsigned i = 0, e = array_lengthof(ARM_MLxTable); i != e; ++i) {
93 if (!MLxEntryMap.insert(std::make_pair(ARM_MLxTable[i].MLxOpc, i)).second)
94 assert(false && "Duplicated entries?");
95 MLxHazardOpcodes.insert(ARM_MLxTable[i].AddSubOpc);
96 MLxHazardOpcodes.insert(ARM_MLxTable[i].MulOpc);
100 // Use a ScoreboardHazardRecognizer for prepass ARM scheduling. TargetInstrImpl
101 // currently defaults to no prepass hazard recognizer.
102 ScheduleHazardRecognizer *ARMBaseInstrInfo::
103 CreateTargetHazardRecognizer(const TargetMachine *TM,
104 const ScheduleDAG *DAG) const {
105 if (usePreRAHazardRecognizer()) {
106 const InstrItineraryData *II = TM->getInstrItineraryData();
107 return new ScoreboardHazardRecognizer(II, DAG, "pre-RA-sched");
109 return TargetInstrInfoImpl::CreateTargetHazardRecognizer(TM, DAG);
112 ScheduleHazardRecognizer *ARMBaseInstrInfo::
113 CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II,
114 const ScheduleDAG *DAG) const {
115 if (Subtarget.isThumb2() || Subtarget.hasVFP2())
116 return (ScheduleHazardRecognizer *)
117 new ARMHazardRecognizer(II, *this, getRegisterInfo(), Subtarget, DAG);
118 return TargetInstrInfoImpl::CreateTargetPostRAHazardRecognizer(II, DAG);
122 ARMBaseInstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
123 MachineBasicBlock::iterator &MBBI,
124 LiveVariables *LV) const {
125 // FIXME: Thumb2 support.
130 MachineInstr *MI = MBBI;
131 MachineFunction &MF = *MI->getParent()->getParent();
132 uint64_t TSFlags = MI->getDesc().TSFlags;
134 switch ((TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift) {
135 default: return NULL;
136 case ARMII::IndexModePre:
139 case ARMII::IndexModePost:
143 // Try splitting an indexed load/store to an un-indexed one plus an add/sub
145 unsigned MemOpc = getUnindexedOpcode(MI->getOpcode());
149 MachineInstr *UpdateMI = NULL;
150 MachineInstr *MemMI = NULL;
151 unsigned AddrMode = (TSFlags & ARMII::AddrModeMask);
152 const MCInstrDesc &MCID = MI->getDesc();
153 unsigned NumOps = MCID.getNumOperands();
154 bool isLoad = !MI->mayStore();
155 const MachineOperand &WB = isLoad ? MI->getOperand(1) : MI->getOperand(0);
156 const MachineOperand &Base = MI->getOperand(2);
157 const MachineOperand &Offset = MI->getOperand(NumOps-3);
158 unsigned WBReg = WB.getReg();
159 unsigned BaseReg = Base.getReg();
160 unsigned OffReg = Offset.getReg();
161 unsigned OffImm = MI->getOperand(NumOps-2).getImm();
162 ARMCC::CondCodes Pred = (ARMCC::CondCodes)MI->getOperand(NumOps-1).getImm();
164 default: llvm_unreachable("Unknown indexed op!");
165 case ARMII::AddrMode2: {
166 bool isSub = ARM_AM::getAM2Op(OffImm) == ARM_AM::sub;
167 unsigned Amt = ARM_AM::getAM2Offset(OffImm);
169 if (ARM_AM::getSOImmVal(Amt) == -1)
170 // Can't encode it in a so_imm operand. This transformation will
171 // add more than 1 instruction. Abandon!
173 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
174 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
175 .addReg(BaseReg).addImm(Amt)
176 .addImm(Pred).addReg(0).addReg(0);
177 } else if (Amt != 0) {
178 ARM_AM::ShiftOpc ShOpc = ARM_AM::getAM2ShiftOpc(OffImm);
179 unsigned SOOpc = ARM_AM::getSORegOpc(ShOpc, Amt);
180 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
181 get(isSub ? ARM::SUBrsi : ARM::ADDrsi), WBReg)
182 .addReg(BaseReg).addReg(OffReg).addReg(0).addImm(SOOpc)
183 .addImm(Pred).addReg(0).addReg(0);
185 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
186 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
187 .addReg(BaseReg).addReg(OffReg)
188 .addImm(Pred).addReg(0).addReg(0);
191 case ARMII::AddrMode3 : {
192 bool isSub = ARM_AM::getAM3Op(OffImm) == ARM_AM::sub;
193 unsigned Amt = ARM_AM::getAM3Offset(OffImm);
195 // Immediate is 8-bits. It's guaranteed to fit in a so_imm operand.
196 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
197 get(isSub ? ARM::SUBri : ARM::ADDri), WBReg)
198 .addReg(BaseReg).addImm(Amt)
199 .addImm(Pred).addReg(0).addReg(0);
201 UpdateMI = BuildMI(MF, MI->getDebugLoc(),
202 get(isSub ? ARM::SUBrr : ARM::ADDrr), WBReg)
203 .addReg(BaseReg).addReg(OffReg)
204 .addImm(Pred).addReg(0).addReg(0);
209 std::vector<MachineInstr*> NewMIs;
212 MemMI = BuildMI(MF, MI->getDebugLoc(),
213 get(MemOpc), MI->getOperand(0).getReg())
214 .addReg(WBReg).addImm(0).addImm(Pred);
216 MemMI = BuildMI(MF, MI->getDebugLoc(),
217 get(MemOpc)).addReg(MI->getOperand(1).getReg())
218 .addReg(WBReg).addReg(0).addImm(0).addImm(Pred);
219 NewMIs.push_back(MemMI);
220 NewMIs.push_back(UpdateMI);
223 MemMI = BuildMI(MF, MI->getDebugLoc(),
224 get(MemOpc), MI->getOperand(0).getReg())
225 .addReg(BaseReg).addImm(0).addImm(Pred);
227 MemMI = BuildMI(MF, MI->getDebugLoc(),
228 get(MemOpc)).addReg(MI->getOperand(1).getReg())
229 .addReg(BaseReg).addReg(0).addImm(0).addImm(Pred);
231 UpdateMI->getOperand(0).setIsDead();
232 NewMIs.push_back(UpdateMI);
233 NewMIs.push_back(MemMI);
236 // Transfer LiveVariables states, kill / dead info.
238 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
239 MachineOperand &MO = MI->getOperand(i);
240 if (MO.isReg() && TargetRegisterInfo::isVirtualRegister(MO.getReg())) {
241 unsigned Reg = MO.getReg();
243 LiveVariables::VarInfo &VI = LV->getVarInfo(Reg);
245 MachineInstr *NewMI = (Reg == WBReg) ? UpdateMI : MemMI;
247 LV->addVirtualRegisterDead(Reg, NewMI);
249 if (MO.isUse() && MO.isKill()) {
250 for (unsigned j = 0; j < 2; ++j) {
251 // Look at the two new MI's in reverse order.
252 MachineInstr *NewMI = NewMIs[j];
253 if (!NewMI->readsRegister(Reg))
255 LV->addVirtualRegisterKilled(Reg, NewMI);
256 if (VI.removeKill(MI))
257 VI.Kills.push_back(NewMI);
265 MFI->insert(MBBI, NewMIs[1]);
266 MFI->insert(MBBI, NewMIs[0]);
272 ARMBaseInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
273 MachineBasicBlock *&FBB,
274 SmallVectorImpl<MachineOperand> &Cond,
275 bool AllowModify) const {
276 // If the block has no terminators, it just falls into the block after it.
277 MachineBasicBlock::iterator I = MBB.end();
278 if (I == MBB.begin())
281 while (I->isDebugValue()) {
282 if (I == MBB.begin())
286 if (!isUnpredicatedTerminator(I))
289 // Get the last instruction in the block.
290 MachineInstr *LastInst = I;
292 // If there is only one terminator instruction, process it.
293 unsigned LastOpc = LastInst->getOpcode();
294 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
295 if (isUncondBranchOpcode(LastOpc)) {
296 TBB = LastInst->getOperand(0).getMBB();
299 if (isCondBranchOpcode(LastOpc)) {
300 // Block ends with fall-through condbranch.
301 TBB = LastInst->getOperand(0).getMBB();
302 Cond.push_back(LastInst->getOperand(1));
303 Cond.push_back(LastInst->getOperand(2));
306 return true; // Can't handle indirect branch.
309 // Get the instruction before it if it is a terminator.
310 MachineInstr *SecondLastInst = I;
311 unsigned SecondLastOpc = SecondLastInst->getOpcode();
313 // If AllowModify is true and the block ends with two or more unconditional
314 // branches, delete all but the first unconditional branch.
315 if (AllowModify && isUncondBranchOpcode(LastOpc)) {
316 while (isUncondBranchOpcode(SecondLastOpc)) {
317 LastInst->eraseFromParent();
318 LastInst = SecondLastInst;
319 LastOpc = LastInst->getOpcode();
320 if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
321 // Return now the only terminator is an unconditional branch.
322 TBB = LastInst->getOperand(0).getMBB();
326 SecondLastOpc = SecondLastInst->getOpcode();
331 // If there are three terminators, we don't know what sort of block this is.
332 if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
335 // If the block ends with a B and a Bcc, handle it.
336 if (isCondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
337 TBB = SecondLastInst->getOperand(0).getMBB();
338 Cond.push_back(SecondLastInst->getOperand(1));
339 Cond.push_back(SecondLastInst->getOperand(2));
340 FBB = LastInst->getOperand(0).getMBB();
344 // If the block ends with two unconditional branches, handle it. The second
345 // one is not executed, so remove it.
346 if (isUncondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
347 TBB = SecondLastInst->getOperand(0).getMBB();
350 I->eraseFromParent();
354 // ...likewise if it ends with a branch table followed by an unconditional
355 // branch. The branch folder can create these, and we must get rid of them for
356 // correctness of Thumb constant islands.
357 if ((isJumpTableBranchOpcode(SecondLastOpc) ||
358 isIndirectBranchOpcode(SecondLastOpc)) &&
359 isUncondBranchOpcode(LastOpc)) {
362 I->eraseFromParent();
366 // Otherwise, can't handle this.
371 unsigned ARMBaseInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
372 MachineBasicBlock::iterator I = MBB.end();
373 if (I == MBB.begin()) return 0;
375 while (I->isDebugValue()) {
376 if (I == MBB.begin())
380 if (!isUncondBranchOpcode(I->getOpcode()) &&
381 !isCondBranchOpcode(I->getOpcode()))
384 // Remove the branch.
385 I->eraseFromParent();
389 if (I == MBB.begin()) return 1;
391 if (!isCondBranchOpcode(I->getOpcode()))
394 // Remove the branch.
395 I->eraseFromParent();
400 ARMBaseInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
401 MachineBasicBlock *FBB,
402 const SmallVectorImpl<MachineOperand> &Cond,
404 ARMFunctionInfo *AFI = MBB.getParent()->getInfo<ARMFunctionInfo>();
405 int BOpc = !AFI->isThumbFunction()
406 ? ARM::B : (AFI->isThumb2Function() ? ARM::t2B : ARM::tB);
407 int BccOpc = !AFI->isThumbFunction()
408 ? ARM::Bcc : (AFI->isThumb2Function() ? ARM::t2Bcc : ARM::tBcc);
409 bool isThumb = AFI->isThumbFunction() || AFI->isThumb2Function();
411 // Shouldn't be a fall through.
412 assert(TBB && "InsertBranch must not be told to insert a fallthrough");
413 assert((Cond.size() == 2 || Cond.size() == 0) &&
414 "ARM branch conditions have two components!");
417 if (Cond.empty()) { // Unconditional branch?
419 BuildMI(&MBB, DL, get(BOpc)).addMBB(TBB).addImm(ARMCC::AL).addReg(0);
421 BuildMI(&MBB, DL, get(BOpc)).addMBB(TBB);
423 BuildMI(&MBB, DL, get(BccOpc)).addMBB(TBB)
424 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
428 // Two-way conditional branch.
429 BuildMI(&MBB, DL, get(BccOpc)).addMBB(TBB)
430 .addImm(Cond[0].getImm()).addReg(Cond[1].getReg());
432 BuildMI(&MBB, DL, get(BOpc)).addMBB(FBB).addImm(ARMCC::AL).addReg(0);
434 BuildMI(&MBB, DL, get(BOpc)).addMBB(FBB);
438 bool ARMBaseInstrInfo::
439 ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
440 ARMCC::CondCodes CC = (ARMCC::CondCodes)(int)Cond[0].getImm();
441 Cond[0].setImm(ARMCC::getOppositeCondition(CC));
445 bool ARMBaseInstrInfo::isPredicated(const MachineInstr *MI) const {
446 if (MI->isBundle()) {
447 MachineBasicBlock::const_instr_iterator I = MI;
448 MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
449 while (++I != E && I->isInsideBundle()) {
450 int PIdx = I->findFirstPredOperandIdx();
451 if (PIdx != -1 && I->getOperand(PIdx).getImm() != ARMCC::AL)
457 int PIdx = MI->findFirstPredOperandIdx();
458 return PIdx != -1 && MI->getOperand(PIdx).getImm() != ARMCC::AL;
461 bool ARMBaseInstrInfo::
462 PredicateInstruction(MachineInstr *MI,
463 const SmallVectorImpl<MachineOperand> &Pred) const {
464 unsigned Opc = MI->getOpcode();
465 if (isUncondBranchOpcode(Opc)) {
466 MI->setDesc(get(getMatchingCondBranchOpcode(Opc)));
467 MI->addOperand(MachineOperand::CreateImm(Pred[0].getImm()));
468 MI->addOperand(MachineOperand::CreateReg(Pred[1].getReg(), false));
472 int PIdx = MI->findFirstPredOperandIdx();
474 MachineOperand &PMO = MI->getOperand(PIdx);
475 PMO.setImm(Pred[0].getImm());
476 MI->getOperand(PIdx+1).setReg(Pred[1].getReg());
482 bool ARMBaseInstrInfo::
483 SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
484 const SmallVectorImpl<MachineOperand> &Pred2) const {
485 if (Pred1.size() > 2 || Pred2.size() > 2)
488 ARMCC::CondCodes CC1 = (ARMCC::CondCodes)Pred1[0].getImm();
489 ARMCC::CondCodes CC2 = (ARMCC::CondCodes)Pred2[0].getImm();
499 return CC2 == ARMCC::HI;
501 return CC2 == ARMCC::LO || CC2 == ARMCC::EQ;
503 return CC2 == ARMCC::GT;
505 return CC2 == ARMCC::LT;
509 bool ARMBaseInstrInfo::DefinesPredicate(MachineInstr *MI,
510 std::vector<MachineOperand> &Pred) const {
512 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
513 const MachineOperand &MO = MI->getOperand(i);
514 if ((MO.isRegMask() && MO.clobbersPhysReg(ARM::CPSR)) ||
515 (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)) {
524 /// isPredicable - Return true if the specified instruction can be predicated.
525 /// By default, this returns true for every instruction with a
526 /// PredicateOperand.
527 bool ARMBaseInstrInfo::isPredicable(MachineInstr *MI) const {
528 if (!MI->isPredicable())
531 if ((MI->getDesc().TSFlags & ARMII::DomainMask) == ARMII::DomainNEON) {
532 ARMFunctionInfo *AFI =
533 MI->getParent()->getParent()->getInfo<ARMFunctionInfo>();
534 return AFI->isThumb2Function();
539 /// FIXME: Works around a gcc miscompilation with -fstrict-aliasing.
540 LLVM_ATTRIBUTE_NOINLINE
541 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
543 static unsigned getNumJTEntries(const std::vector<MachineJumpTableEntry> &JT,
545 assert(JTI < JT.size());
546 return JT[JTI].MBBs.size();
549 /// GetInstSize - Return the size of the specified MachineInstr.
551 unsigned ARMBaseInstrInfo::GetInstSizeInBytes(const MachineInstr *MI) const {
552 const MachineBasicBlock &MBB = *MI->getParent();
553 const MachineFunction *MF = MBB.getParent();
554 const MCAsmInfo *MAI = MF->getTarget().getMCAsmInfo();
556 const MCInstrDesc &MCID = MI->getDesc();
558 return MCID.getSize();
560 // If this machine instr is an inline asm, measure it.
561 if (MI->getOpcode() == ARM::INLINEASM)
562 return getInlineAsmLength(MI->getOperand(0).getSymbolName(), *MAI);
565 unsigned Opc = MI->getOpcode();
567 case TargetOpcode::IMPLICIT_DEF:
568 case TargetOpcode::KILL:
569 case TargetOpcode::PROLOG_LABEL:
570 case TargetOpcode::EH_LABEL:
571 case TargetOpcode::DBG_VALUE:
573 case TargetOpcode::BUNDLE:
574 return getInstBundleLength(MI);
575 case ARM::MOVi16_ga_pcrel:
576 case ARM::MOVTi16_ga_pcrel:
577 case ARM::t2MOVi16_ga_pcrel:
578 case ARM::t2MOVTi16_ga_pcrel:
581 case ARM::t2MOVi32imm:
583 case ARM::CONSTPOOL_ENTRY:
584 // If this machine instr is a constant pool entry, its size is recorded as
586 return MI->getOperand(2).getImm();
587 case ARM::Int_eh_sjlj_longjmp:
589 case ARM::tInt_eh_sjlj_longjmp:
591 case ARM::Int_eh_sjlj_setjmp:
592 case ARM::Int_eh_sjlj_setjmp_nofp:
594 case ARM::tInt_eh_sjlj_setjmp:
595 case ARM::t2Int_eh_sjlj_setjmp:
596 case ARM::t2Int_eh_sjlj_setjmp_nofp:
604 case ARM::t2TBH_JT: {
605 // These are jumptable branches, i.e. a branch followed by an inlined
606 // jumptable. The size is 4 + 4 * number of entries. For TBB, each
607 // entry is one byte; TBH two byte each.
608 unsigned EntrySize = (Opc == ARM::t2TBB_JT)
609 ? 1 : ((Opc == ARM::t2TBH_JT) ? 2 : 4);
610 unsigned NumOps = MCID.getNumOperands();
611 MachineOperand JTOP =
612 MI->getOperand(NumOps - (MI->isPredicable() ? 3 : 2));
613 unsigned JTI = JTOP.getIndex();
614 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo();
616 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables();
617 assert(JTI < JT.size());
618 // Thumb instructions are 2 byte aligned, but JT entries are 4 byte
619 // 4 aligned. The assembler / linker may add 2 byte padding just before
620 // the JT entries. The size does not include this padding; the
621 // constant islands pass does separate bookkeeping for it.
622 // FIXME: If we know the size of the function is less than (1 << 16) *2
623 // bytes, we can use 16-bit entries instead. Then there won't be an
625 unsigned InstSize = (Opc == ARM::tBR_JTr || Opc == ARM::t2BR_JT) ? 2 : 4;
626 unsigned NumEntries = getNumJTEntries(JT, JTI);
627 if (Opc == ARM::t2TBB_JT && (NumEntries & 1))
628 // Make sure the instruction that follows TBB is 2-byte aligned.
629 // FIXME: Constant island pass should insert an "ALIGN" instruction
632 return NumEntries * EntrySize + InstSize;
635 // Otherwise, pseudo-instruction sizes are zero.
640 unsigned ARMBaseInstrInfo::getInstBundleLength(const MachineInstr *MI) const {
642 MachineBasicBlock::const_instr_iterator I = MI;
643 MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
644 while (++I != E && I->isInsideBundle()) {
645 assert(!I->isBundle() && "No nested bundle!");
646 Size += GetInstSizeInBytes(&*I);
651 void ARMBaseInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
652 MachineBasicBlock::iterator I, DebugLoc DL,
653 unsigned DestReg, unsigned SrcReg,
654 bool KillSrc) const {
655 bool GPRDest = ARM::GPRRegClass.contains(DestReg);
656 bool GPRSrc = ARM::GPRRegClass.contains(SrcReg);
658 if (GPRDest && GPRSrc) {
659 AddDefaultCC(AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::MOVr), DestReg)
660 .addReg(SrcReg, getKillRegState(KillSrc))));
664 bool SPRDest = ARM::SPRRegClass.contains(DestReg);
665 bool SPRSrc = ARM::SPRRegClass.contains(SrcReg);
668 if (SPRDest && SPRSrc)
670 else if (GPRDest && SPRSrc)
672 else if (SPRDest && GPRSrc)
674 else if (ARM::DPRRegClass.contains(DestReg, SrcReg))
676 else if (ARM::QPRRegClass.contains(DestReg, SrcReg))
680 MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(Opc), DestReg);
681 MIB.addReg(SrcReg, getKillRegState(KillSrc));
682 if (Opc == ARM::VORRq)
683 MIB.addReg(SrcReg, getKillRegState(KillSrc));
688 // Handle register classes that require multiple instructions.
689 unsigned BeginIdx = 0;
690 unsigned SubRegs = 0;
693 // Use VORRq when possible.
694 if (ARM::QQPRRegClass.contains(DestReg, SrcReg))
695 Opc = ARM::VORRq, BeginIdx = ARM::qsub_0, SubRegs = 2;
696 else if (ARM::QQQQPRRegClass.contains(DestReg, SrcReg))
697 Opc = ARM::VORRq, BeginIdx = ARM::qsub_0, SubRegs = 4;
698 // Fall back to VMOVD.
699 else if (ARM::DPairRegClass.contains(DestReg, SrcReg))
700 Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 2;
701 else if (ARM::DTripleRegClass.contains(DestReg, SrcReg))
702 Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 3;
703 else if (ARM::DQuadRegClass.contains(DestReg, SrcReg))
704 Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 4;
705 else if (ARM::GPRPairRegClass.contains(DestReg, SrcReg))
706 Opc = ARM::MOVr, BeginIdx = ARM::gsub_0, SubRegs = 2;
708 else if (ARM::DPairSpcRegClass.contains(DestReg, SrcReg))
709 Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 2, Spacing = 2;
710 else if (ARM::DTripleSpcRegClass.contains(DestReg, SrcReg))
711 Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 3, Spacing = 2;
712 else if (ARM::DQuadSpcRegClass.contains(DestReg, SrcReg))
713 Opc = ARM::VMOVD, BeginIdx = ARM::dsub_0, SubRegs = 4, Spacing = 2;
715 assert(Opc && "Impossible reg-to-reg copy");
717 const TargetRegisterInfo *TRI = &getRegisterInfo();
718 MachineInstrBuilder Mov;
720 // Copy register tuples backward when the first Dest reg overlaps with SrcReg.
721 if (TRI->regsOverlap(SrcReg, TRI->getSubReg(DestReg, BeginIdx))) {
722 BeginIdx = BeginIdx + ((SubRegs-1)*Spacing);
726 SmallSet<unsigned, 4> DstRegs;
728 for (unsigned i = 0; i != SubRegs; ++i) {
729 unsigned Dst = TRI->getSubReg(DestReg, BeginIdx + i*Spacing);
730 unsigned Src = TRI->getSubReg(SrcReg, BeginIdx + i*Spacing);
731 assert(Dst && Src && "Bad sub-register");
733 assert(!DstRegs.count(Src) && "destructive vector copy");
736 Mov = BuildMI(MBB, I, I->getDebugLoc(), get(Opc), Dst)
738 // VORR takes two source operands.
739 if (Opc == ARM::VORRq)
741 Mov = AddDefaultPred(Mov);
743 // Add implicit super-register defs and kills to the last instruction.
744 Mov->addRegisterDefined(DestReg, TRI);
746 Mov->addRegisterKilled(SrcReg, TRI);
750 MachineInstrBuilder &AddDReg(MachineInstrBuilder &MIB,
751 unsigned Reg, unsigned SubIdx, unsigned State,
752 const TargetRegisterInfo *TRI) {
754 return MIB.addReg(Reg, State);
756 if (TargetRegisterInfo::isPhysicalRegister(Reg))
757 return MIB.addReg(TRI->getSubReg(Reg, SubIdx), State);
758 return MIB.addReg(Reg, State, SubIdx);
761 void ARMBaseInstrInfo::
762 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
763 unsigned SrcReg, bool isKill, int FI,
764 const TargetRegisterClass *RC,
765 const TargetRegisterInfo *TRI) const {
767 if (I != MBB.end()) DL = I->getDebugLoc();
768 MachineFunction &MF = *MBB.getParent();
769 MachineFrameInfo &MFI = *MF.getFrameInfo();
770 unsigned Align = MFI.getObjectAlignment(FI);
772 MachineMemOperand *MMO =
773 MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
774 MachineMemOperand::MOStore,
775 MFI.getObjectSize(FI),
778 switch (RC->getSize()) {
780 if (ARM::GPRRegClass.hasSubClassEq(RC)) {
781 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::STRi12))
782 .addReg(SrcReg, getKillRegState(isKill))
783 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
784 } else if (ARM::SPRRegClass.hasSubClassEq(RC)) {
785 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTRS))
786 .addReg(SrcReg, getKillRegState(isKill))
787 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
789 llvm_unreachable("Unknown reg class!");
792 if (ARM::DPRRegClass.hasSubClassEq(RC)) {
793 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTRD))
794 .addReg(SrcReg, getKillRegState(isKill))
795 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
796 } else if (ARM::GPRPairRegClass.hasSubClassEq(RC)) {
797 MachineInstrBuilder MIB =
798 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::STMIA))
801 MIB = AddDReg(MIB, SrcReg, ARM::gsub_0, getKillRegState(isKill), TRI);
802 AddDReg(MIB, SrcReg, ARM::gsub_1, 0, TRI);
804 llvm_unreachable("Unknown reg class!");
807 if (ARM::DPairRegClass.hasSubClassEq(RC)) {
808 // Use aligned spills if the stack can be realigned.
809 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
810 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VST1q64))
811 .addFrameIndex(FI).addImm(16)
812 .addReg(SrcReg, getKillRegState(isKill))
813 .addMemOperand(MMO));
815 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMQIA))
816 .addReg(SrcReg, getKillRegState(isKill))
818 .addMemOperand(MMO));
821 llvm_unreachable("Unknown reg class!");
824 if (ARM::DTripleRegClass.hasSubClassEq(RC)) {
825 // Use aligned spills if the stack can be realigned.
826 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
827 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VST1d64TPseudo))
828 .addFrameIndex(FI).addImm(16)
829 .addReg(SrcReg, getKillRegState(isKill))
830 .addMemOperand(MMO));
832 MachineInstrBuilder MIB =
833 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMDIA))
836 MIB = AddDReg(MIB, SrcReg, ARM::dsub_0, getKillRegState(isKill), TRI);
837 MIB = AddDReg(MIB, SrcReg, ARM::dsub_1, 0, TRI);
838 AddDReg(MIB, SrcReg, ARM::dsub_2, 0, TRI);
841 llvm_unreachable("Unknown reg class!");
844 if (ARM::QQPRRegClass.hasSubClassEq(RC) || ARM::DQuadRegClass.hasSubClassEq(RC)) {
845 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
846 // FIXME: It's possible to only store part of the QQ register if the
847 // spilled def has a sub-register index.
848 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VST1d64QPseudo))
849 .addFrameIndex(FI).addImm(16)
850 .addReg(SrcReg, getKillRegState(isKill))
851 .addMemOperand(MMO));
853 MachineInstrBuilder MIB =
854 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMDIA))
857 MIB = AddDReg(MIB, SrcReg, ARM::dsub_0, getKillRegState(isKill), TRI);
858 MIB = AddDReg(MIB, SrcReg, ARM::dsub_1, 0, TRI);
859 MIB = AddDReg(MIB, SrcReg, ARM::dsub_2, 0, TRI);
860 AddDReg(MIB, SrcReg, ARM::dsub_3, 0, TRI);
863 llvm_unreachable("Unknown reg class!");
866 if (ARM::QQQQPRRegClass.hasSubClassEq(RC)) {
867 MachineInstrBuilder MIB =
868 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VSTMDIA))
871 MIB = AddDReg(MIB, SrcReg, ARM::dsub_0, getKillRegState(isKill), TRI);
872 MIB = AddDReg(MIB, SrcReg, ARM::dsub_1, 0, TRI);
873 MIB = AddDReg(MIB, SrcReg, ARM::dsub_2, 0, TRI);
874 MIB = AddDReg(MIB, SrcReg, ARM::dsub_3, 0, TRI);
875 MIB = AddDReg(MIB, SrcReg, ARM::dsub_4, 0, TRI);
876 MIB = AddDReg(MIB, SrcReg, ARM::dsub_5, 0, TRI);
877 MIB = AddDReg(MIB, SrcReg, ARM::dsub_6, 0, TRI);
878 AddDReg(MIB, SrcReg, ARM::dsub_7, 0, TRI);
880 llvm_unreachable("Unknown reg class!");
883 llvm_unreachable("Unknown reg class!");
888 ARMBaseInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
889 int &FrameIndex) const {
890 switch (MI->getOpcode()) {
893 case ARM::t2STRs: // FIXME: don't use t2STRs to access frame.
894 if (MI->getOperand(1).isFI() &&
895 MI->getOperand(2).isReg() &&
896 MI->getOperand(3).isImm() &&
897 MI->getOperand(2).getReg() == 0 &&
898 MI->getOperand(3).getImm() == 0) {
899 FrameIndex = MI->getOperand(1).getIndex();
900 return MI->getOperand(0).getReg();
908 if (MI->getOperand(1).isFI() &&
909 MI->getOperand(2).isImm() &&
910 MI->getOperand(2).getImm() == 0) {
911 FrameIndex = MI->getOperand(1).getIndex();
912 return MI->getOperand(0).getReg();
916 case ARM::VST1d64TPseudo:
917 case ARM::VST1d64QPseudo:
918 if (MI->getOperand(0).isFI() &&
919 MI->getOperand(2).getSubReg() == 0) {
920 FrameIndex = MI->getOperand(0).getIndex();
921 return MI->getOperand(2).getReg();
925 if (MI->getOperand(1).isFI() &&
926 MI->getOperand(0).getSubReg() == 0) {
927 FrameIndex = MI->getOperand(1).getIndex();
928 return MI->getOperand(0).getReg();
936 unsigned ARMBaseInstrInfo::isStoreToStackSlotPostFE(const MachineInstr *MI,
937 int &FrameIndex) const {
938 const MachineMemOperand *Dummy;
939 return MI->mayStore() && hasStoreToStackSlot(MI, Dummy, FrameIndex);
942 void ARMBaseInstrInfo::
943 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
944 unsigned DestReg, int FI,
945 const TargetRegisterClass *RC,
946 const TargetRegisterInfo *TRI) const {
948 if (I != MBB.end()) DL = I->getDebugLoc();
949 MachineFunction &MF = *MBB.getParent();
950 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
951 MachineFrameInfo &MFI = *MF.getFrameInfo();
952 unsigned Align = MFI.getObjectAlignment(FI);
953 MachineMemOperand *MMO =
954 MF.getMachineMemOperand(
955 MachinePointerInfo::getFixedStack(FI),
956 MachineMemOperand::MOLoad,
957 MFI.getObjectSize(FI),
960 switch (RC->getSize()) {
962 if (ARM::GPRRegClass.hasSubClassEq(RC)) {
963 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::LDRi12), DestReg)
964 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
966 } else if (ARM::SPRRegClass.hasSubClassEq(RC)) {
967 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDRS), DestReg)
968 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
970 llvm_unreachable("Unknown reg class!");
973 if (ARM::DPRRegClass.hasSubClassEq(RC)) {
974 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDRD), DestReg)
975 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
976 } else if (ARM::GPRPairRegClass.hasSubClassEq(RC)) {
977 unsigned LdmOpc = AFI->isThumbFunction() ? ARM::t2LDMIA : ARM::LDMIA;
978 MachineInstrBuilder MIB =
979 AddDefaultPred(BuildMI(MBB, I, DL, get(LdmOpc))
980 .addFrameIndex(FI).addImm(0).addMemOperand(MMO));
981 MIB = AddDReg(MIB, DestReg, ARM::gsub_0, RegState::DefineNoRead, TRI);
982 MIB = AddDReg(MIB, DestReg, ARM::gsub_1, RegState::DefineNoRead, TRI);
983 if (TargetRegisterInfo::isPhysicalRegister(DestReg))
984 MIB.addReg(DestReg, RegState::ImplicitDefine);
986 llvm_unreachable("Unknown reg class!");
989 if (ARM::DPairRegClass.hasSubClassEq(RC)) {
990 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
991 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLD1q64), DestReg)
992 .addFrameIndex(FI).addImm(16)
993 .addMemOperand(MMO));
995 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMQIA), DestReg)
997 .addMemOperand(MMO));
1000 llvm_unreachable("Unknown reg class!");
1003 if (ARM::DTripleRegClass.hasSubClassEq(RC)) {
1004 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
1005 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLD1d64TPseudo), DestReg)
1006 .addFrameIndex(FI).addImm(16)
1007 .addMemOperand(MMO));
1009 MachineInstrBuilder MIB =
1010 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMDIA))
1012 .addMemOperand(MMO));
1013 MIB = AddDReg(MIB, DestReg, ARM::dsub_0, RegState::DefineNoRead, TRI);
1014 MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::DefineNoRead, TRI);
1015 MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::DefineNoRead, TRI);
1016 if (TargetRegisterInfo::isPhysicalRegister(DestReg))
1017 MIB.addReg(DestReg, RegState::ImplicitDefine);
1020 llvm_unreachable("Unknown reg class!");
1023 if (ARM::QQPRRegClass.hasSubClassEq(RC) || ARM::DQuadRegClass.hasSubClassEq(RC)) {
1024 if (Align >= 16 && getRegisterInfo().canRealignStack(MF)) {
1025 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLD1d64QPseudo), DestReg)
1026 .addFrameIndex(FI).addImm(16)
1027 .addMemOperand(MMO));
1029 MachineInstrBuilder MIB =
1030 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMDIA))
1032 .addMemOperand(MMO);
1033 MIB = AddDReg(MIB, DestReg, ARM::dsub_0, RegState::DefineNoRead, TRI);
1034 MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::DefineNoRead, TRI);
1035 MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::DefineNoRead, TRI);
1036 MIB = AddDReg(MIB, DestReg, ARM::dsub_3, RegState::DefineNoRead, TRI);
1037 if (TargetRegisterInfo::isPhysicalRegister(DestReg))
1038 MIB.addReg(DestReg, RegState::ImplicitDefine);
1041 llvm_unreachable("Unknown reg class!");
1044 if (ARM::QQQQPRRegClass.hasSubClassEq(RC)) {
1045 MachineInstrBuilder MIB =
1046 AddDefaultPred(BuildMI(MBB, I, DL, get(ARM::VLDMDIA))
1048 .addMemOperand(MMO);
1049 MIB = AddDReg(MIB, DestReg, ARM::dsub_0, RegState::DefineNoRead, TRI);
1050 MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::DefineNoRead, TRI);
1051 MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::DefineNoRead, TRI);
1052 MIB = AddDReg(MIB, DestReg, ARM::dsub_3, RegState::DefineNoRead, TRI);
1053 MIB = AddDReg(MIB, DestReg, ARM::dsub_4, RegState::DefineNoRead, TRI);
1054 MIB = AddDReg(MIB, DestReg, ARM::dsub_5, RegState::DefineNoRead, TRI);
1055 MIB = AddDReg(MIB, DestReg, ARM::dsub_6, RegState::DefineNoRead, TRI);
1056 MIB = AddDReg(MIB, DestReg, ARM::dsub_7, RegState::DefineNoRead, TRI);
1057 if (TargetRegisterInfo::isPhysicalRegister(DestReg))
1058 MIB.addReg(DestReg, RegState::ImplicitDefine);
1060 llvm_unreachable("Unknown reg class!");
1063 llvm_unreachable("Unknown regclass!");
1068 ARMBaseInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
1069 int &FrameIndex) const {
1070 switch (MI->getOpcode()) {
1073 case ARM::t2LDRs: // FIXME: don't use t2LDRs to access frame.
1074 if (MI->getOperand(1).isFI() &&
1075 MI->getOperand(2).isReg() &&
1076 MI->getOperand(3).isImm() &&
1077 MI->getOperand(2).getReg() == 0 &&
1078 MI->getOperand(3).getImm() == 0) {
1079 FrameIndex = MI->getOperand(1).getIndex();
1080 return MI->getOperand(0).getReg();
1088 if (MI->getOperand(1).isFI() &&
1089 MI->getOperand(2).isImm() &&
1090 MI->getOperand(2).getImm() == 0) {
1091 FrameIndex = MI->getOperand(1).getIndex();
1092 return MI->getOperand(0).getReg();
1096 case ARM::VLD1d64TPseudo:
1097 case ARM::VLD1d64QPseudo:
1098 if (MI->getOperand(1).isFI() &&
1099 MI->getOperand(0).getSubReg() == 0) {
1100 FrameIndex = MI->getOperand(1).getIndex();
1101 return MI->getOperand(0).getReg();
1105 if (MI->getOperand(1).isFI() &&
1106 MI->getOperand(0).getSubReg() == 0) {
1107 FrameIndex = MI->getOperand(1).getIndex();
1108 return MI->getOperand(0).getReg();
1116 unsigned ARMBaseInstrInfo::isLoadFromStackSlotPostFE(const MachineInstr *MI,
1117 int &FrameIndex) const {
1118 const MachineMemOperand *Dummy;
1119 return MI->mayLoad() && hasLoadFromStackSlot(MI, Dummy, FrameIndex);
1122 bool ARMBaseInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const{
1123 // This hook gets to expand COPY instructions before they become
1124 // copyPhysReg() calls. Look for VMOVS instructions that can legally be
1125 // widened to VMOVD. We prefer the VMOVD when possible because it may be
1126 // changed into a VORR that can go down the NEON pipeline.
1127 if (!WidenVMOVS || !MI->isCopy())
1130 // Look for a copy between even S-registers. That is where we keep floats
1131 // when using NEON v2f32 instructions for f32 arithmetic.
1132 unsigned DstRegS = MI->getOperand(0).getReg();
1133 unsigned SrcRegS = MI->getOperand(1).getReg();
1134 if (!ARM::SPRRegClass.contains(DstRegS, SrcRegS))
1137 const TargetRegisterInfo *TRI = &getRegisterInfo();
1138 unsigned DstRegD = TRI->getMatchingSuperReg(DstRegS, ARM::ssub_0,
1140 unsigned SrcRegD = TRI->getMatchingSuperReg(SrcRegS, ARM::ssub_0,
1142 if (!DstRegD || !SrcRegD)
1145 // We want to widen this into a DstRegD = VMOVD SrcRegD copy. This is only
1146 // legal if the COPY already defines the full DstRegD, and it isn't a
1147 // sub-register insertion.
1148 if (!MI->definesRegister(DstRegD, TRI) || MI->readsRegister(DstRegD, TRI))
1151 // A dead copy shouldn't show up here, but reject it just in case.
1152 if (MI->getOperand(0).isDead())
1155 // All clear, widen the COPY.
1156 DEBUG(dbgs() << "widening: " << *MI);
1158 // Get rid of the old <imp-def> of DstRegD. Leave it if it defines a Q-reg
1159 // or some other super-register.
1160 int ImpDefIdx = MI->findRegisterDefOperandIdx(DstRegD);
1161 if (ImpDefIdx != -1)
1162 MI->RemoveOperand(ImpDefIdx);
1164 // Change the opcode and operands.
1165 MI->setDesc(get(ARM::VMOVD));
1166 MI->getOperand(0).setReg(DstRegD);
1167 MI->getOperand(1).setReg(SrcRegD);
1168 AddDefaultPred(MachineInstrBuilder(MI));
1170 // We are now reading SrcRegD instead of SrcRegS. This may upset the
1171 // register scavenger and machine verifier, so we need to indicate that we
1172 // are reading an undefined value from SrcRegD, but a proper value from
1174 MI->getOperand(1).setIsUndef();
1175 MachineInstrBuilder(MI).addReg(SrcRegS, RegState::Implicit);
1177 // SrcRegD may actually contain an unrelated value in the ssub_1
1178 // sub-register. Don't kill it. Only kill the ssub_0 sub-register.
1179 if (MI->getOperand(1).isKill()) {
1180 MI->getOperand(1).setIsKill(false);
1181 MI->addRegisterKilled(SrcRegS, TRI, true);
1184 DEBUG(dbgs() << "replaced by: " << *MI);
1189 ARMBaseInstrInfo::emitFrameIndexDebugValue(MachineFunction &MF,
1190 int FrameIx, uint64_t Offset,
1191 const MDNode *MDPtr,
1192 DebugLoc DL) const {
1193 MachineInstrBuilder MIB = BuildMI(MF, DL, get(ARM::DBG_VALUE))
1194 .addFrameIndex(FrameIx).addImm(0).addImm(Offset).addMetadata(MDPtr);
1198 /// Create a copy of a const pool value. Update CPI to the new index and return
1200 static unsigned duplicateCPV(MachineFunction &MF, unsigned &CPI) {
1201 MachineConstantPool *MCP = MF.getConstantPool();
1202 ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
1204 const MachineConstantPoolEntry &MCPE = MCP->getConstants()[CPI];
1205 assert(MCPE.isMachineConstantPoolEntry() &&
1206 "Expecting a machine constantpool entry!");
1207 ARMConstantPoolValue *ACPV =
1208 static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
1210 unsigned PCLabelId = AFI->createPICLabelUId();
1211 ARMConstantPoolValue *NewCPV = 0;
1212 // FIXME: The below assumes PIC relocation model and that the function
1213 // is Thumb mode (t1 or t2). PCAdjustment would be 8 for ARM mode PIC, and
1214 // zero for non-PIC in ARM or Thumb. The callers are all of thumb LDR
1215 // instructions, so that's probably OK, but is PIC always correct when
1217 if (ACPV->isGlobalValue())
1218 NewCPV = ARMConstantPoolConstant::
1219 Create(cast<ARMConstantPoolConstant>(ACPV)->getGV(), PCLabelId,
1221 else if (ACPV->isExtSymbol())
1222 NewCPV = ARMConstantPoolSymbol::
1223 Create(MF.getFunction()->getContext(),
1224 cast<ARMConstantPoolSymbol>(ACPV)->getSymbol(), PCLabelId, 4);
1225 else if (ACPV->isBlockAddress())
1226 NewCPV = ARMConstantPoolConstant::
1227 Create(cast<ARMConstantPoolConstant>(ACPV)->getBlockAddress(), PCLabelId,
1228 ARMCP::CPBlockAddress, 4);
1229 else if (ACPV->isLSDA())
1230 NewCPV = ARMConstantPoolConstant::Create(MF.getFunction(), PCLabelId,
1232 else if (ACPV->isMachineBasicBlock())
1233 NewCPV = ARMConstantPoolMBB::
1234 Create(MF.getFunction()->getContext(),
1235 cast<ARMConstantPoolMBB>(ACPV)->getMBB(), PCLabelId, 4);
1237 llvm_unreachable("Unexpected ARM constantpool value type!!");
1238 CPI = MCP->getConstantPoolIndex(NewCPV, MCPE.getAlignment());
1242 void ARMBaseInstrInfo::
1243 reMaterialize(MachineBasicBlock &MBB,
1244 MachineBasicBlock::iterator I,
1245 unsigned DestReg, unsigned SubIdx,
1246 const MachineInstr *Orig,
1247 const TargetRegisterInfo &TRI) const {
1248 unsigned Opcode = Orig->getOpcode();
1251 MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
1252 MI->substituteRegister(Orig->getOperand(0).getReg(), DestReg, SubIdx, TRI);
1256 case ARM::tLDRpci_pic:
1257 case ARM::t2LDRpci_pic: {
1258 MachineFunction &MF = *MBB.getParent();
1259 unsigned CPI = Orig->getOperand(1).getIndex();
1260 unsigned PCLabelId = duplicateCPV(MF, CPI);
1261 MachineInstrBuilder MIB = BuildMI(MBB, I, Orig->getDebugLoc(), get(Opcode),
1263 .addConstantPoolIndex(CPI).addImm(PCLabelId);
1264 MIB->setMemRefs(Orig->memoperands_begin(), Orig->memoperands_end());
1271 ARMBaseInstrInfo::duplicate(MachineInstr *Orig, MachineFunction &MF) const {
1272 MachineInstr *MI = TargetInstrInfoImpl::duplicate(Orig, MF);
1273 switch(Orig->getOpcode()) {
1274 case ARM::tLDRpci_pic:
1275 case ARM::t2LDRpci_pic: {
1276 unsigned CPI = Orig->getOperand(1).getIndex();
1277 unsigned PCLabelId = duplicateCPV(MF, CPI);
1278 Orig->getOperand(1).setIndex(CPI);
1279 Orig->getOperand(2).setImm(PCLabelId);
1286 bool ARMBaseInstrInfo::produceSameValue(const MachineInstr *MI0,
1287 const MachineInstr *MI1,
1288 const MachineRegisterInfo *MRI) const {
1289 int Opcode = MI0->getOpcode();
1290 if (Opcode == ARM::t2LDRpci ||
1291 Opcode == ARM::t2LDRpci_pic ||
1292 Opcode == ARM::tLDRpci ||
1293 Opcode == ARM::tLDRpci_pic ||
1294 Opcode == ARM::MOV_ga_dyn ||
1295 Opcode == ARM::MOV_ga_pcrel ||
1296 Opcode == ARM::MOV_ga_pcrel_ldr ||
1297 Opcode == ARM::t2MOV_ga_dyn ||
1298 Opcode == ARM::t2MOV_ga_pcrel) {
1299 if (MI1->getOpcode() != Opcode)
1301 if (MI0->getNumOperands() != MI1->getNumOperands())
1304 const MachineOperand &MO0 = MI0->getOperand(1);
1305 const MachineOperand &MO1 = MI1->getOperand(1);
1306 if (MO0.getOffset() != MO1.getOffset())
1309 if (Opcode == ARM::MOV_ga_dyn ||
1310 Opcode == ARM::MOV_ga_pcrel ||
1311 Opcode == ARM::MOV_ga_pcrel_ldr ||
1312 Opcode == ARM::t2MOV_ga_dyn ||
1313 Opcode == ARM::t2MOV_ga_pcrel)
1314 // Ignore the PC labels.
1315 return MO0.getGlobal() == MO1.getGlobal();
1317 const MachineFunction *MF = MI0->getParent()->getParent();
1318 const MachineConstantPool *MCP = MF->getConstantPool();
1319 int CPI0 = MO0.getIndex();
1320 int CPI1 = MO1.getIndex();
1321 const MachineConstantPoolEntry &MCPE0 = MCP->getConstants()[CPI0];
1322 const MachineConstantPoolEntry &MCPE1 = MCP->getConstants()[CPI1];
1323 bool isARMCP0 = MCPE0.isMachineConstantPoolEntry();
1324 bool isARMCP1 = MCPE1.isMachineConstantPoolEntry();
1325 if (isARMCP0 && isARMCP1) {
1326 ARMConstantPoolValue *ACPV0 =
1327 static_cast<ARMConstantPoolValue*>(MCPE0.Val.MachineCPVal);
1328 ARMConstantPoolValue *ACPV1 =
1329 static_cast<ARMConstantPoolValue*>(MCPE1.Val.MachineCPVal);
1330 return ACPV0->hasSameValue(ACPV1);
1331 } else if (!isARMCP0 && !isARMCP1) {
1332 return MCPE0.Val.ConstVal == MCPE1.Val.ConstVal;
1335 } else if (Opcode == ARM::PICLDR) {
1336 if (MI1->getOpcode() != Opcode)
1338 if (MI0->getNumOperands() != MI1->getNumOperands())
1341 unsigned Addr0 = MI0->getOperand(1).getReg();
1342 unsigned Addr1 = MI1->getOperand(1).getReg();
1343 if (Addr0 != Addr1) {
1345 !TargetRegisterInfo::isVirtualRegister(Addr0) ||
1346 !TargetRegisterInfo::isVirtualRegister(Addr1))
1349 // This assumes SSA form.
1350 MachineInstr *Def0 = MRI->getVRegDef(Addr0);
1351 MachineInstr *Def1 = MRI->getVRegDef(Addr1);
1352 // Check if the loaded value, e.g. a constantpool of a global address, are
1354 if (!produceSameValue(Def0, Def1, MRI))
1358 for (unsigned i = 3, e = MI0->getNumOperands(); i != e; ++i) {
1359 // %vreg12<def> = PICLDR %vreg11, 0, pred:14, pred:%noreg
1360 const MachineOperand &MO0 = MI0->getOperand(i);
1361 const MachineOperand &MO1 = MI1->getOperand(i);
1362 if (!MO0.isIdenticalTo(MO1))
1368 return MI0->isIdenticalTo(MI1, MachineInstr::IgnoreVRegDefs);
1371 /// areLoadsFromSameBasePtr - This is used by the pre-regalloc scheduler to
1372 /// determine if two loads are loading from the same base address. It should
1373 /// only return true if the base pointers are the same and the only differences
1374 /// between the two addresses is the offset. It also returns the offsets by
1376 bool ARMBaseInstrInfo::areLoadsFromSameBasePtr(SDNode *Load1, SDNode *Load2,
1378 int64_t &Offset2) const {
1379 // Don't worry about Thumb: just ARM and Thumb2.
1380 if (Subtarget.isThumb1Only()) return false;
1382 if (!Load1->isMachineOpcode() || !Load2->isMachineOpcode())
1385 switch (Load1->getMachineOpcode()) {
1398 case ARM::t2LDRSHi8:
1400 case ARM::t2LDRSHi12:
1404 switch (Load2->getMachineOpcode()) {
1416 case ARM::t2LDRSHi8:
1418 case ARM::t2LDRSHi12:
1422 // Check if base addresses and chain operands match.
1423 if (Load1->getOperand(0) != Load2->getOperand(0) ||
1424 Load1->getOperand(4) != Load2->getOperand(4))
1427 // Index should be Reg0.
1428 if (Load1->getOperand(3) != Load2->getOperand(3))
1431 // Determine the offsets.
1432 if (isa<ConstantSDNode>(Load1->getOperand(1)) &&
1433 isa<ConstantSDNode>(Load2->getOperand(1))) {
1434 Offset1 = cast<ConstantSDNode>(Load1->getOperand(1))->getSExtValue();
1435 Offset2 = cast<ConstantSDNode>(Load2->getOperand(1))->getSExtValue();
1442 /// shouldScheduleLoadsNear - This is a used by the pre-regalloc scheduler to
1443 /// determine (in conjunction with areLoadsFromSameBasePtr) if two loads should
1444 /// be scheduled togther. On some targets if two loads are loading from
1445 /// addresses in the same cache line, it's better if they are scheduled
1446 /// together. This function takes two integers that represent the load offsets
1447 /// from the common base address. It returns true if it decides it's desirable
1448 /// to schedule the two loads together. "NumLoads" is the number of loads that
1449 /// have already been scheduled after Load1.
1450 bool ARMBaseInstrInfo::shouldScheduleLoadsNear(SDNode *Load1, SDNode *Load2,
1451 int64_t Offset1, int64_t Offset2,
1452 unsigned NumLoads) const {
1453 // Don't worry about Thumb: just ARM and Thumb2.
1454 if (Subtarget.isThumb1Only()) return false;
1456 assert(Offset2 > Offset1);
1458 if ((Offset2 - Offset1) / 8 > 64)
1461 if (Load1->getMachineOpcode() != Load2->getMachineOpcode())
1462 return false; // FIXME: overly conservative?
1464 // Four loads in a row should be sufficient.
1471 bool ARMBaseInstrInfo::isSchedulingBoundary(const MachineInstr *MI,
1472 const MachineBasicBlock *MBB,
1473 const MachineFunction &MF) const {
1474 // Debug info is never a scheduling boundary. It's necessary to be explicit
1475 // due to the special treatment of IT instructions below, otherwise a
1476 // dbg_value followed by an IT will result in the IT instruction being
1477 // considered a scheduling hazard, which is wrong. It should be the actual
1478 // instruction preceding the dbg_value instruction(s), just like it is
1479 // when debug info is not present.
1480 if (MI->isDebugValue())
1483 // Terminators and labels can't be scheduled around.
1484 if (MI->isTerminator() || MI->isLabel())
1487 // Treat the start of the IT block as a scheduling boundary, but schedule
1488 // t2IT along with all instructions following it.
1489 // FIXME: This is a big hammer. But the alternative is to add all potential
1490 // true and anti dependencies to IT block instructions as implicit operands
1491 // to the t2IT instruction. The added compile time and complexity does not
1493 MachineBasicBlock::const_iterator I = MI;
1494 // Make sure to skip any dbg_value instructions
1495 while (++I != MBB->end() && I->isDebugValue())
1497 if (I != MBB->end() && I->getOpcode() == ARM::t2IT)
1500 // Don't attempt to schedule around any instruction that defines
1501 // a stack-oriented pointer, as it's unlikely to be profitable. This
1502 // saves compile time, because it doesn't require every single
1503 // stack slot reference to depend on the instruction that does the
1505 // Calls don't actually change the stack pointer, even if they have imp-defs.
1506 // No ARM calling conventions change the stack pointer. (X86 calling
1507 // conventions sometimes do).
1508 if (!MI->isCall() && MI->definesRegister(ARM::SP))
1514 bool ARMBaseInstrInfo::
1515 isProfitableToIfCvt(MachineBasicBlock &MBB,
1516 unsigned NumCycles, unsigned ExtraPredCycles,
1517 const BranchProbability &Probability) const {
1521 // Attempt to estimate the relative costs of predication versus branching.
1522 unsigned UnpredCost = Probability.getNumerator() * NumCycles;
1523 UnpredCost /= Probability.getDenominator();
1524 UnpredCost += 1; // The branch itself
1525 UnpredCost += Subtarget.getMispredictionPenalty() / 10;
1527 return (NumCycles + ExtraPredCycles) <= UnpredCost;
1530 bool ARMBaseInstrInfo::
1531 isProfitableToIfCvt(MachineBasicBlock &TMBB,
1532 unsigned TCycles, unsigned TExtra,
1533 MachineBasicBlock &FMBB,
1534 unsigned FCycles, unsigned FExtra,
1535 const BranchProbability &Probability) const {
1536 if (!TCycles || !FCycles)
1539 // Attempt to estimate the relative costs of predication versus branching.
1540 unsigned TUnpredCost = Probability.getNumerator() * TCycles;
1541 TUnpredCost /= Probability.getDenominator();
1543 uint32_t Comp = Probability.getDenominator() - Probability.getNumerator();
1544 unsigned FUnpredCost = Comp * FCycles;
1545 FUnpredCost /= Probability.getDenominator();
1547 unsigned UnpredCost = TUnpredCost + FUnpredCost;
1548 UnpredCost += 1; // The branch itself
1549 UnpredCost += Subtarget.getMispredictionPenalty() / 10;
1551 return (TCycles + FCycles + TExtra + FExtra) <= UnpredCost;
1555 ARMBaseInstrInfo::isProfitableToUnpredicate(MachineBasicBlock &TMBB,
1556 MachineBasicBlock &FMBB) const {
1557 // Reduce false anti-dependencies to let Swift's out-of-order execution
1558 // engine do its thing.
1559 return Subtarget.isSwift();
1562 /// getInstrPredicate - If instruction is predicated, returns its predicate
1563 /// condition, otherwise returns AL. It also returns the condition code
1564 /// register by reference.
1566 llvm::getInstrPredicate(const MachineInstr *MI, unsigned &PredReg) {
1567 int PIdx = MI->findFirstPredOperandIdx();
1573 PredReg = MI->getOperand(PIdx+1).getReg();
1574 return (ARMCC::CondCodes)MI->getOperand(PIdx).getImm();
1578 int llvm::getMatchingCondBranchOpcode(int Opc) {
1583 if (Opc == ARM::t2B)
1586 llvm_unreachable("Unknown unconditional branch opcode!");
1589 /// commuteInstruction - Handle commutable instructions.
1591 ARMBaseInstrInfo::commuteInstruction(MachineInstr *MI, bool NewMI) const {
1592 switch (MI->getOpcode()) {
1594 case ARM::t2MOVCCr: {
1595 // MOVCC can be commuted by inverting the condition.
1596 unsigned PredReg = 0;
1597 ARMCC::CondCodes CC = getInstrPredicate(MI, PredReg);
1598 // MOVCC AL can't be inverted. Shouldn't happen.
1599 if (CC == ARMCC::AL || PredReg != ARM::CPSR)
1601 MI = TargetInstrInfoImpl::commuteInstruction(MI, NewMI);
1604 // After swapping the MOVCC operands, also invert the condition.
1605 MI->getOperand(MI->findFirstPredOperandIdx())
1606 .setImm(ARMCC::getOppositeCondition(CC));
1610 return TargetInstrInfoImpl::commuteInstruction(MI, NewMI);
1613 /// Identify instructions that can be folded into a MOVCC instruction, and
1614 /// return the defining instruction.
1615 static MachineInstr *canFoldIntoMOVCC(unsigned Reg,
1616 const MachineRegisterInfo &MRI,
1617 const TargetInstrInfo *TII) {
1618 if (!TargetRegisterInfo::isVirtualRegister(Reg))
1620 if (!MRI.hasOneNonDBGUse(Reg))
1622 MachineInstr *MI = MRI.getVRegDef(Reg);
1625 // MI is folded into the MOVCC by predicating it.
1626 if (!MI->isPredicable())
1628 // Check if MI has any non-dead defs or physreg uses. This also detects
1629 // predicated instructions which will be reading CPSR.
1630 for (unsigned i = 1, e = MI->getNumOperands(); i != e; ++i) {
1631 const MachineOperand &MO = MI->getOperand(i);
1632 // Reject frame index operands, PEI can't handle the predicated pseudos.
1633 if (MO.isFI() || MO.isCPI() || MO.isJTI())
1637 // MI can't have any tied operands, that would conflict with predication.
1640 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
1642 if (MO.isDef() && !MO.isDead())
1645 bool DontMoveAcrossStores = true;
1646 if (!MI->isSafeToMove(TII, /* AliasAnalysis = */ 0, DontMoveAcrossStores))
1651 bool ARMBaseInstrInfo::analyzeSelect(const MachineInstr *MI,
1652 SmallVectorImpl<MachineOperand> &Cond,
1653 unsigned &TrueOp, unsigned &FalseOp,
1654 bool &Optimizable) const {
1655 assert((MI->getOpcode() == ARM::MOVCCr || MI->getOpcode() == ARM::t2MOVCCr) &&
1656 "Unknown select instruction");
1661 // 3: Condition code.
1665 Cond.push_back(MI->getOperand(3));
1666 Cond.push_back(MI->getOperand(4));
1667 // We can always fold a def.
1672 MachineInstr *ARMBaseInstrInfo::optimizeSelect(MachineInstr *MI,
1673 bool PreferFalse) const {
1674 assert((MI->getOpcode() == ARM::MOVCCr || MI->getOpcode() == ARM::t2MOVCCr) &&
1675 "Unknown select instruction");
1676 const MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo();
1677 MachineInstr *DefMI = canFoldIntoMOVCC(MI->getOperand(2).getReg(), MRI, this);
1678 bool Invert = !DefMI;
1680 DefMI = canFoldIntoMOVCC(MI->getOperand(1).getReg(), MRI, this);
1684 // Create a new predicated version of DefMI.
1685 // Rfalse is the first use.
1686 MachineInstrBuilder NewMI = BuildMI(*MI->getParent(), MI, MI->getDebugLoc(),
1688 MI->getOperand(0).getReg());
1690 // Copy all the DefMI operands, excluding its (null) predicate.
1691 const MCInstrDesc &DefDesc = DefMI->getDesc();
1692 for (unsigned i = 1, e = DefDesc.getNumOperands();
1693 i != e && !DefDesc.OpInfo[i].isPredicate(); ++i)
1694 NewMI.addOperand(DefMI->getOperand(i));
1696 unsigned CondCode = MI->getOperand(3).getImm();
1698 NewMI.addImm(ARMCC::getOppositeCondition(ARMCC::CondCodes(CondCode)));
1700 NewMI.addImm(CondCode);
1701 NewMI.addOperand(MI->getOperand(4));
1703 // DefMI is not the -S version that sets CPSR, so add an optional %noreg.
1704 if (NewMI->hasOptionalDef())
1705 AddDefaultCC(NewMI);
1707 // The output register value when the predicate is false is an implicit
1708 // register operand tied to the first def.
1709 // The tie makes the register allocator ensure the FalseReg is allocated the
1710 // same register as operand 0.
1711 MachineOperand FalseReg = MI->getOperand(Invert ? 2 : 1);
1712 FalseReg.setImplicit();
1713 NewMI->addOperand(FalseReg);
1714 NewMI->tieOperands(0, NewMI->getNumOperands() - 1);
1716 // The caller will erase MI, but not DefMI.
1717 DefMI->eraseFromParent();
1721 /// Map pseudo instructions that imply an 'S' bit onto real opcodes. Whether the
1722 /// instruction is encoded with an 'S' bit is determined by the optional CPSR
1725 /// This will go away once we can teach tblgen how to set the optional CPSR def
1727 struct AddSubFlagsOpcodePair {
1729 uint16_t MachineOpc;
1732 static const AddSubFlagsOpcodePair AddSubFlagsOpcodeMap[] = {
1733 {ARM::ADDSri, ARM::ADDri},
1734 {ARM::ADDSrr, ARM::ADDrr},
1735 {ARM::ADDSrsi, ARM::ADDrsi},
1736 {ARM::ADDSrsr, ARM::ADDrsr},
1738 {ARM::SUBSri, ARM::SUBri},
1739 {ARM::SUBSrr, ARM::SUBrr},
1740 {ARM::SUBSrsi, ARM::SUBrsi},
1741 {ARM::SUBSrsr, ARM::SUBrsr},
1743 {ARM::RSBSri, ARM::RSBri},
1744 {ARM::RSBSrsi, ARM::RSBrsi},
1745 {ARM::RSBSrsr, ARM::RSBrsr},
1747 {ARM::t2ADDSri, ARM::t2ADDri},
1748 {ARM::t2ADDSrr, ARM::t2ADDrr},
1749 {ARM::t2ADDSrs, ARM::t2ADDrs},
1751 {ARM::t2SUBSri, ARM::t2SUBri},
1752 {ARM::t2SUBSrr, ARM::t2SUBrr},
1753 {ARM::t2SUBSrs, ARM::t2SUBrs},
1755 {ARM::t2RSBSri, ARM::t2RSBri},
1756 {ARM::t2RSBSrs, ARM::t2RSBrs},
1759 unsigned llvm::convertAddSubFlagsOpcode(unsigned OldOpc) {
1760 for (unsigned i = 0, e = array_lengthof(AddSubFlagsOpcodeMap); i != e; ++i)
1761 if (OldOpc == AddSubFlagsOpcodeMap[i].PseudoOpc)
1762 return AddSubFlagsOpcodeMap[i].MachineOpc;
1766 void llvm::emitARMRegPlusImmediate(MachineBasicBlock &MBB,
1767 MachineBasicBlock::iterator &MBBI, DebugLoc dl,
1768 unsigned DestReg, unsigned BaseReg, int NumBytes,
1769 ARMCC::CondCodes Pred, unsigned PredReg,
1770 const ARMBaseInstrInfo &TII, unsigned MIFlags) {
1771 bool isSub = NumBytes < 0;
1772 if (isSub) NumBytes = -NumBytes;
1775 unsigned RotAmt = ARM_AM::getSOImmValRotate(NumBytes);
1776 unsigned ThisVal = NumBytes & ARM_AM::rotr32(0xFF, RotAmt);
1777 assert(ThisVal && "Didn't extract field correctly");
1779 // We will handle these bits from offset, clear them.
1780 NumBytes &= ~ThisVal;
1782 assert(ARM_AM::getSOImmVal(ThisVal) != -1 && "Bit extraction didn't work?");
1784 // Build the new ADD / SUB.
1785 unsigned Opc = isSub ? ARM::SUBri : ARM::ADDri;
1786 BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
1787 .addReg(BaseReg, RegState::Kill).addImm(ThisVal)
1788 .addImm((unsigned)Pred).addReg(PredReg).addReg(0)
1789 .setMIFlags(MIFlags);
1794 bool llvm::rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
1795 unsigned FrameReg, int &Offset,
1796 const ARMBaseInstrInfo &TII) {
1797 unsigned Opcode = MI.getOpcode();
1798 const MCInstrDesc &Desc = MI.getDesc();
1799 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
1802 // Memory operands in inline assembly always use AddrMode2.
1803 if (Opcode == ARM::INLINEASM)
1804 AddrMode = ARMII::AddrMode2;
1806 if (Opcode == ARM::ADDri) {
1807 Offset += MI.getOperand(FrameRegIdx+1).getImm();
1809 // Turn it into a move.
1810 MI.setDesc(TII.get(ARM::MOVr));
1811 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1812 MI.RemoveOperand(FrameRegIdx+1);
1815 } else if (Offset < 0) {
1818 MI.setDesc(TII.get(ARM::SUBri));
1821 // Common case: small offset, fits into instruction.
1822 if (ARM_AM::getSOImmVal(Offset) != -1) {
1823 // Replace the FrameIndex with sp / fp
1824 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1825 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset);
1830 // Otherwise, pull as much of the immedidate into this ADDri/SUBri
1832 unsigned RotAmt = ARM_AM::getSOImmValRotate(Offset);
1833 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xFF, RotAmt);
1835 // We will handle these bits from offset, clear them.
1836 Offset &= ~ThisImmVal;
1838 // Get the properly encoded SOImmVal field.
1839 assert(ARM_AM::getSOImmVal(ThisImmVal) != -1 &&
1840 "Bit extraction didn't work?");
1841 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(ThisImmVal);
1843 unsigned ImmIdx = 0;
1845 unsigned NumBits = 0;
1848 case ARMII::AddrMode_i12: {
1849 ImmIdx = FrameRegIdx + 1;
1850 InstrOffs = MI.getOperand(ImmIdx).getImm();
1854 case ARMII::AddrMode2: {
1855 ImmIdx = FrameRegIdx+2;
1856 InstrOffs = ARM_AM::getAM2Offset(MI.getOperand(ImmIdx).getImm());
1857 if (ARM_AM::getAM2Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1862 case ARMII::AddrMode3: {
1863 ImmIdx = FrameRegIdx+2;
1864 InstrOffs = ARM_AM::getAM3Offset(MI.getOperand(ImmIdx).getImm());
1865 if (ARM_AM::getAM3Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1870 case ARMII::AddrMode4:
1871 case ARMII::AddrMode6:
1872 // Can't fold any offset even if it's zero.
1874 case ARMII::AddrMode5: {
1875 ImmIdx = FrameRegIdx+1;
1876 InstrOffs = ARM_AM::getAM5Offset(MI.getOperand(ImmIdx).getImm());
1877 if (ARM_AM::getAM5Op(MI.getOperand(ImmIdx).getImm()) == ARM_AM::sub)
1884 llvm_unreachable("Unsupported addressing mode!");
1887 Offset += InstrOffs * Scale;
1888 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
1894 // Attempt to fold address comp. if opcode has offset bits
1896 // Common case: small offset, fits into instruction.
1897 MachineOperand &ImmOp = MI.getOperand(ImmIdx);
1898 int ImmedOffset = Offset / Scale;
1899 unsigned Mask = (1 << NumBits) - 1;
1900 if ((unsigned)Offset <= Mask * Scale) {
1901 // Replace the FrameIndex with sp
1902 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
1903 // FIXME: When addrmode2 goes away, this will simplify (like the
1904 // T2 version), as the LDR.i12 versions don't need the encoding
1905 // tricks for the offset value.
1907 if (AddrMode == ARMII::AddrMode_i12)
1908 ImmedOffset = -ImmedOffset;
1910 ImmedOffset |= 1 << NumBits;
1912 ImmOp.ChangeToImmediate(ImmedOffset);
1917 // Otherwise, it didn't fit. Pull in what we can to simplify the immed.
1918 ImmedOffset = ImmedOffset & Mask;
1920 if (AddrMode == ARMII::AddrMode_i12)
1921 ImmedOffset = -ImmedOffset;
1923 ImmedOffset |= 1 << NumBits;
1925 ImmOp.ChangeToImmediate(ImmedOffset);
1926 Offset &= ~(Mask*Scale);
1930 Offset = (isSub) ? -Offset : Offset;
1934 /// analyzeCompare - For a comparison instruction, return the source registers
1935 /// in SrcReg and SrcReg2 if having two register operands, and the value it
1936 /// compares against in CmpValue. Return true if the comparison instruction
1937 /// can be analyzed.
1938 bool ARMBaseInstrInfo::
1939 analyzeCompare(const MachineInstr *MI, unsigned &SrcReg, unsigned &SrcReg2,
1940 int &CmpMask, int &CmpValue) const {
1941 switch (MI->getOpcode()) {
1945 SrcReg = MI->getOperand(0).getReg();
1948 CmpValue = MI->getOperand(1).getImm();
1952 SrcReg = MI->getOperand(0).getReg();
1953 SrcReg2 = MI->getOperand(1).getReg();
1959 SrcReg = MI->getOperand(0).getReg();
1961 CmpMask = MI->getOperand(1).getImm();
1969 /// isSuitableForMask - Identify a suitable 'and' instruction that
1970 /// operates on the given source register and applies the same mask
1971 /// as a 'tst' instruction. Provide a limited look-through for copies.
1972 /// When successful, MI will hold the found instruction.
1973 static bool isSuitableForMask(MachineInstr *&MI, unsigned SrcReg,
1974 int CmpMask, bool CommonUse) {
1975 switch (MI->getOpcode()) {
1978 if (CmpMask != MI->getOperand(2).getImm())
1980 if (SrcReg == MI->getOperand(CommonUse ? 1 : 0).getReg())
1984 // Walk down one instruction which is potentially an 'and'.
1985 const MachineInstr &Copy = *MI;
1986 MachineBasicBlock::iterator AND(
1987 llvm::next(MachineBasicBlock::iterator(MI)));
1988 if (AND == MI->getParent()->end()) return false;
1990 return isSuitableForMask(MI, Copy.getOperand(0).getReg(),
1998 /// getSwappedCondition - assume the flags are set by MI(a,b), return
1999 /// the condition code if we modify the instructions such that flags are
2001 inline static ARMCC::CondCodes getSwappedCondition(ARMCC::CondCodes CC) {
2003 default: return ARMCC::AL;
2004 case ARMCC::EQ: return ARMCC::EQ;
2005 case ARMCC::NE: return ARMCC::NE;
2006 case ARMCC::HS: return ARMCC::LS;
2007 case ARMCC::LO: return ARMCC::HI;
2008 case ARMCC::HI: return ARMCC::LO;
2009 case ARMCC::LS: return ARMCC::HS;
2010 case ARMCC::GE: return ARMCC::LE;
2011 case ARMCC::LT: return ARMCC::GT;
2012 case ARMCC::GT: return ARMCC::LT;
2013 case ARMCC::LE: return ARMCC::GE;
2017 /// isRedundantFlagInstr - check whether the first instruction, whose only
2018 /// purpose is to update flags, can be made redundant.
2019 /// CMPrr can be made redundant by SUBrr if the operands are the same.
2020 /// CMPri can be made redundant by SUBri if the operands are the same.
2021 /// This function can be extended later on.
2022 inline static bool isRedundantFlagInstr(MachineInstr *CmpI, unsigned SrcReg,
2023 unsigned SrcReg2, int ImmValue,
2025 if ((CmpI->getOpcode() == ARM::CMPrr ||
2026 CmpI->getOpcode() == ARM::t2CMPrr) &&
2027 (OI->getOpcode() == ARM::SUBrr ||
2028 OI->getOpcode() == ARM::t2SUBrr) &&
2029 ((OI->getOperand(1).getReg() == SrcReg &&
2030 OI->getOperand(2).getReg() == SrcReg2) ||
2031 (OI->getOperand(1).getReg() == SrcReg2 &&
2032 OI->getOperand(2).getReg() == SrcReg)))
2035 if ((CmpI->getOpcode() == ARM::CMPri ||
2036 CmpI->getOpcode() == ARM::t2CMPri) &&
2037 (OI->getOpcode() == ARM::SUBri ||
2038 OI->getOpcode() == ARM::t2SUBri) &&
2039 OI->getOperand(1).getReg() == SrcReg &&
2040 OI->getOperand(2).getImm() == ImmValue)
2045 /// optimizeCompareInstr - Convert the instruction supplying the argument to the
2046 /// comparison into one that sets the zero bit in the flags register;
2047 /// Remove a redundant Compare instruction if an earlier instruction can set the
2048 /// flags in the same way as Compare.
2049 /// E.g. SUBrr(r1,r2) and CMPrr(r1,r2). We also handle the case where two
2050 /// operands are swapped: SUBrr(r1,r2) and CMPrr(r2,r1), by updating the
2051 /// condition code of instructions which use the flags.
2052 bool ARMBaseInstrInfo::
2053 optimizeCompareInstr(MachineInstr *CmpInstr, unsigned SrcReg, unsigned SrcReg2,
2054 int CmpMask, int CmpValue,
2055 const MachineRegisterInfo *MRI) const {
2056 // Get the unique definition of SrcReg.
2057 MachineInstr *MI = MRI->getUniqueVRegDef(SrcReg);
2058 if (!MI) return false;
2060 // Masked compares sometimes use the same register as the corresponding 'and'.
2061 if (CmpMask != ~0) {
2062 if (!isSuitableForMask(MI, SrcReg, CmpMask, false) || isPredicated(MI)) {
2064 for (MachineRegisterInfo::use_iterator UI = MRI->use_begin(SrcReg),
2065 UE = MRI->use_end(); UI != UE; ++UI) {
2066 if (UI->getParent() != CmpInstr->getParent()) continue;
2067 MachineInstr *PotentialAND = &*UI;
2068 if (!isSuitableForMask(PotentialAND, SrcReg, CmpMask, true) ||
2069 isPredicated(PotentialAND))
2074 if (!MI) return false;
2078 // Get ready to iterate backward from CmpInstr.
2079 MachineBasicBlock::iterator I = CmpInstr, E = MI,
2080 B = CmpInstr->getParent()->begin();
2082 // Early exit if CmpInstr is at the beginning of the BB.
2083 if (I == B) return false;
2085 // There are two possible candidates which can be changed to set CPSR:
2086 // One is MI, the other is a SUB instruction.
2087 // For CMPrr(r1,r2), we are looking for SUB(r1,r2) or SUB(r2,r1).
2088 // For CMPri(r1, CmpValue), we are looking for SUBri(r1, CmpValue).
2089 MachineInstr *Sub = NULL;
2091 // MI is not a candidate for CMPrr.
2093 else if (MI->getParent() != CmpInstr->getParent() || CmpValue != 0) {
2094 // Conservatively refuse to convert an instruction which isn't in the same
2095 // BB as the comparison.
2096 // For CMPri, we need to check Sub, thus we can't return here.
2097 if (CmpInstr->getOpcode() == ARM::CMPri ||
2098 CmpInstr->getOpcode() == ARM::t2CMPri)
2104 // Check that CPSR isn't set between the comparison instruction and the one we
2105 // want to change. At the same time, search for Sub.
2106 const TargetRegisterInfo *TRI = &getRegisterInfo();
2108 for (; I != E; --I) {
2109 const MachineInstr &Instr = *I;
2111 if (Instr.modifiesRegister(ARM::CPSR, TRI) ||
2112 Instr.readsRegister(ARM::CPSR, TRI))
2113 // This instruction modifies or uses CPSR after the one we want to
2114 // change. We can't do this transformation.
2117 // Check whether CmpInstr can be made redundant by the current instruction.
2118 if (isRedundantFlagInstr(CmpInstr, SrcReg, SrcReg2, CmpValue, &*I)) {
2124 // The 'and' is below the comparison instruction.
2128 // Return false if no candidates exist.
2132 // The single candidate is called MI.
2135 // We can't use a predicated instruction - it doesn't always write the flags.
2136 if (isPredicated(MI))
2139 switch (MI->getOpcode()) {
2173 case ARM::t2EORri: {
2174 // Scan forward for the use of CPSR
2175 // When checking against MI: if it's a conditional code requires
2176 // checking of V bit, then this is not safe to do.
2177 // It is safe to remove CmpInstr if CPSR is redefined or killed.
2178 // If we are done with the basic block, we need to check whether CPSR is
2180 SmallVector<std::pair<MachineOperand*, ARMCC::CondCodes>, 4>
2182 bool isSafe = false;
2184 E = CmpInstr->getParent()->end();
2185 while (!isSafe && ++I != E) {
2186 const MachineInstr &Instr = *I;
2187 for (unsigned IO = 0, EO = Instr.getNumOperands();
2188 !isSafe && IO != EO; ++IO) {
2189 const MachineOperand &MO = Instr.getOperand(IO);
2190 if (MO.isRegMask() && MO.clobbersPhysReg(ARM::CPSR)) {
2194 if (!MO.isReg() || MO.getReg() != ARM::CPSR)
2200 // Condition code is after the operand before CPSR.
2201 ARMCC::CondCodes CC = (ARMCC::CondCodes)Instr.getOperand(IO-1).getImm();
2203 ARMCC::CondCodes NewCC = getSwappedCondition(CC);
2204 if (NewCC == ARMCC::AL)
2206 // If we have SUB(r1, r2) and CMP(r2, r1), the condition code based
2207 // on CMP needs to be updated to be based on SUB.
2208 // Push the condition code operands to OperandsToUpdate.
2209 // If it is safe to remove CmpInstr, the condition code of these
2210 // operands will be modified.
2211 if (SrcReg2 != 0 && Sub->getOperand(1).getReg() == SrcReg2 &&
2212 Sub->getOperand(2).getReg() == SrcReg)
2213 OperandsToUpdate.push_back(std::make_pair(&((*I).getOperand(IO-1)),
2219 // CPSR can be used multiple times, we should continue.
2232 // If CPSR is not killed nor re-defined, we should check whether it is
2233 // live-out. If it is live-out, do not optimize.
2235 MachineBasicBlock *MBB = CmpInstr->getParent();
2236 for (MachineBasicBlock::succ_iterator SI = MBB->succ_begin(),
2237 SE = MBB->succ_end(); SI != SE; ++SI)
2238 if ((*SI)->isLiveIn(ARM::CPSR))
2242 // Toggle the optional operand to CPSR.
2243 MI->getOperand(5).setReg(ARM::CPSR);
2244 MI->getOperand(5).setIsDef(true);
2245 assert(!isPredicated(MI) && "Can't use flags from predicated instruction");
2246 CmpInstr->eraseFromParent();
2248 // Modify the condition code of operands in OperandsToUpdate.
2249 // Since we have SUB(r1, r2) and CMP(r2, r1), the condition code needs to
2250 // be changed from r2 > r1 to r1 < r2, from r2 < r1 to r1 > r2, etc.
2251 for (unsigned i = 0, e = OperandsToUpdate.size(); i < e; i++)
2252 OperandsToUpdate[i].first->setImm(OperandsToUpdate[i].second);
2260 bool ARMBaseInstrInfo::FoldImmediate(MachineInstr *UseMI,
2261 MachineInstr *DefMI, unsigned Reg,
2262 MachineRegisterInfo *MRI) const {
2263 // Fold large immediates into add, sub, or, xor.
2264 unsigned DefOpc = DefMI->getOpcode();
2265 if (DefOpc != ARM::t2MOVi32imm && DefOpc != ARM::MOVi32imm)
2267 if (!DefMI->getOperand(1).isImm())
2268 // Could be t2MOVi32imm <ga:xx>
2271 if (!MRI->hasOneNonDBGUse(Reg))
2274 const MCInstrDesc &DefMCID = DefMI->getDesc();
2275 if (DefMCID.hasOptionalDef()) {
2276 unsigned NumOps = DefMCID.getNumOperands();
2277 const MachineOperand &MO = DefMI->getOperand(NumOps-1);
2278 if (MO.getReg() == ARM::CPSR && !MO.isDead())
2279 // If DefMI defines CPSR and it is not dead, it's obviously not safe
2284 const MCInstrDesc &UseMCID = UseMI->getDesc();
2285 if (UseMCID.hasOptionalDef()) {
2286 unsigned NumOps = UseMCID.getNumOperands();
2287 if (UseMI->getOperand(NumOps-1).getReg() == ARM::CPSR)
2288 // If the instruction sets the flag, do not attempt this optimization
2289 // since it may change the semantics of the code.
2293 unsigned UseOpc = UseMI->getOpcode();
2294 unsigned NewUseOpc = 0;
2295 uint32_t ImmVal = (uint32_t)DefMI->getOperand(1).getImm();
2296 uint32_t SOImmValV1 = 0, SOImmValV2 = 0;
2297 bool Commute = false;
2299 default: return false;
2307 case ARM::t2EORrr: {
2308 Commute = UseMI->getOperand(2).getReg() != Reg;
2315 NewUseOpc = ARM::SUBri;
2321 if (!ARM_AM::isSOImmTwoPartVal(ImmVal))
2323 SOImmValV1 = (uint32_t)ARM_AM::getSOImmTwoPartFirst(ImmVal);
2324 SOImmValV2 = (uint32_t)ARM_AM::getSOImmTwoPartSecond(ImmVal);
2327 case ARM::ADDrr: NewUseOpc = ARM::ADDri; break;
2328 case ARM::ORRrr: NewUseOpc = ARM::ORRri; break;
2329 case ARM::EORrr: NewUseOpc = ARM::EORri; break;
2333 case ARM::t2SUBrr: {
2337 NewUseOpc = ARM::t2SUBri;
2342 case ARM::t2EORrr: {
2343 if (!ARM_AM::isT2SOImmTwoPartVal(ImmVal))
2345 SOImmValV1 = (uint32_t)ARM_AM::getT2SOImmTwoPartFirst(ImmVal);
2346 SOImmValV2 = (uint32_t)ARM_AM::getT2SOImmTwoPartSecond(ImmVal);
2349 case ARM::t2ADDrr: NewUseOpc = ARM::t2ADDri; break;
2350 case ARM::t2ORRrr: NewUseOpc = ARM::t2ORRri; break;
2351 case ARM::t2EORrr: NewUseOpc = ARM::t2EORri; break;
2359 unsigned OpIdx = Commute ? 2 : 1;
2360 unsigned Reg1 = UseMI->getOperand(OpIdx).getReg();
2361 bool isKill = UseMI->getOperand(OpIdx).isKill();
2362 unsigned NewReg = MRI->createVirtualRegister(MRI->getRegClass(Reg));
2363 AddDefaultCC(AddDefaultPred(BuildMI(*UseMI->getParent(),
2364 UseMI, UseMI->getDebugLoc(),
2365 get(NewUseOpc), NewReg)
2366 .addReg(Reg1, getKillRegState(isKill))
2367 .addImm(SOImmValV1)));
2368 UseMI->setDesc(get(NewUseOpc));
2369 UseMI->getOperand(1).setReg(NewReg);
2370 UseMI->getOperand(1).setIsKill();
2371 UseMI->getOperand(2).ChangeToImmediate(SOImmValV2);
2372 DefMI->eraseFromParent();
2376 static unsigned getNumMicroOpsSwiftLdSt(const InstrItineraryData *ItinData,
2377 const MachineInstr *MI) {
2378 switch (MI->getOpcode()) {
2380 const MCInstrDesc &Desc = MI->getDesc();
2381 int UOps = ItinData->getNumMicroOps(Desc.getSchedClass());
2382 assert(UOps >= 0 && "bad # UOps");
2390 unsigned ShOpVal = MI->getOperand(3).getImm();
2391 bool isSub = ARM_AM::getAM2Op(ShOpVal) == ARM_AM::sub;
2392 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
2395 ((ShImm == 1 || ShImm == 2 || ShImm == 3) &&
2396 ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl)))
2403 if (!MI->getOperand(2).getReg())
2406 unsigned ShOpVal = MI->getOperand(3).getImm();
2407 bool isSub = ARM_AM::getAM2Op(ShOpVal) == ARM_AM::sub;
2408 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
2411 ((ShImm == 1 || ShImm == 2 || ShImm == 3) &&
2412 ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl)))
2419 return (ARM_AM::getAM3Op(MI->getOperand(3).getImm()) == ARM_AM::sub) ? 3:2;
2421 case ARM::LDRSB_POST:
2422 case ARM::LDRSH_POST: {
2423 unsigned Rt = MI->getOperand(0).getReg();
2424 unsigned Rm = MI->getOperand(3).getReg();
2425 return (Rt == Rm) ? 4 : 3;
2428 case ARM::LDR_PRE_REG:
2429 case ARM::LDRB_PRE_REG: {
2430 unsigned Rt = MI->getOperand(0).getReg();
2431 unsigned Rm = MI->getOperand(3).getReg();
2434 unsigned ShOpVal = MI->getOperand(4).getImm();
2435 bool isSub = ARM_AM::getAM2Op(ShOpVal) == ARM_AM::sub;
2436 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
2439 ((ShImm == 1 || ShImm == 2 || ShImm == 3) &&
2440 ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl)))
2445 case ARM::STR_PRE_REG:
2446 case ARM::STRB_PRE_REG: {
2447 unsigned ShOpVal = MI->getOperand(4).getImm();
2448 bool isSub = ARM_AM::getAM2Op(ShOpVal) == ARM_AM::sub;
2449 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
2452 ((ShImm == 1 || ShImm == 2 || ShImm == 3) &&
2453 ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl)))
2459 case ARM::STRH_PRE: {
2460 unsigned Rt = MI->getOperand(0).getReg();
2461 unsigned Rm = MI->getOperand(3).getReg();
2466 return (ARM_AM::getAM3Op(MI->getOperand(4).getImm()) == ARM_AM::sub)
2470 case ARM::LDR_POST_REG:
2471 case ARM::LDRB_POST_REG:
2472 case ARM::LDRH_POST: {
2473 unsigned Rt = MI->getOperand(0).getReg();
2474 unsigned Rm = MI->getOperand(3).getReg();
2475 return (Rt == Rm) ? 3 : 2;
2478 case ARM::LDR_PRE_IMM:
2479 case ARM::LDRB_PRE_IMM:
2480 case ARM::LDR_POST_IMM:
2481 case ARM::LDRB_POST_IMM:
2482 case ARM::STRB_POST_IMM:
2483 case ARM::STRB_POST_REG:
2484 case ARM::STRB_PRE_IMM:
2485 case ARM::STRH_POST:
2486 case ARM::STR_POST_IMM:
2487 case ARM::STR_POST_REG:
2488 case ARM::STR_PRE_IMM:
2491 case ARM::LDRSB_PRE:
2492 case ARM::LDRSH_PRE: {
2493 unsigned Rm = MI->getOperand(3).getReg();
2496 unsigned Rt = MI->getOperand(0).getReg();
2499 unsigned ShOpVal = MI->getOperand(4).getImm();
2500 bool isSub = ARM_AM::getAM2Op(ShOpVal) == ARM_AM::sub;
2501 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
2504 ((ShImm == 1 || ShImm == 2 || ShImm == 3) &&
2505 ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl)))
2511 unsigned Rt = MI->getOperand(0).getReg();
2512 unsigned Rn = MI->getOperand(2).getReg();
2513 unsigned Rm = MI->getOperand(3).getReg();
2515 return (ARM_AM::getAM3Op(MI->getOperand(4).getImm()) == ARM_AM::sub) ?4:3;
2516 return (Rt == Rn) ? 3 : 2;
2520 unsigned Rm = MI->getOperand(3).getReg();
2522 return (ARM_AM::getAM3Op(MI->getOperand(4).getImm()) == ARM_AM::sub) ?4:3;
2526 case ARM::LDRD_POST:
2527 case ARM::t2LDRD_POST:
2530 case ARM::STRD_POST:
2531 case ARM::t2STRD_POST:
2534 case ARM::LDRD_PRE: {
2535 unsigned Rt = MI->getOperand(0).getReg();
2536 unsigned Rn = MI->getOperand(3).getReg();
2537 unsigned Rm = MI->getOperand(4).getReg();
2539 return (ARM_AM::getAM3Op(MI->getOperand(5).getImm()) == ARM_AM::sub) ?5:4;
2540 return (Rt == Rn) ? 4 : 3;
2543 case ARM::t2LDRD_PRE: {
2544 unsigned Rt = MI->getOperand(0).getReg();
2545 unsigned Rn = MI->getOperand(3).getReg();
2546 return (Rt == Rn) ? 4 : 3;
2549 case ARM::STRD_PRE: {
2550 unsigned Rm = MI->getOperand(4).getReg();
2552 return (ARM_AM::getAM3Op(MI->getOperand(5).getImm()) == ARM_AM::sub) ?5:4;
2556 case ARM::t2STRD_PRE:
2559 case ARM::t2LDR_POST:
2560 case ARM::t2LDRB_POST:
2561 case ARM::t2LDRB_PRE:
2562 case ARM::t2LDRSBi12:
2563 case ARM::t2LDRSBi8:
2564 case ARM::t2LDRSBpci:
2566 case ARM::t2LDRH_POST:
2567 case ARM::t2LDRH_PRE:
2569 case ARM::t2LDRSB_POST:
2570 case ARM::t2LDRSB_PRE:
2571 case ARM::t2LDRSH_POST:
2572 case ARM::t2LDRSH_PRE:
2573 case ARM::t2LDRSHi12:
2574 case ARM::t2LDRSHi8:
2575 case ARM::t2LDRSHpci:
2579 case ARM::t2LDRDi8: {
2580 unsigned Rt = MI->getOperand(0).getReg();
2581 unsigned Rn = MI->getOperand(2).getReg();
2582 return (Rt == Rn) ? 3 : 2;
2585 case ARM::t2STRB_POST:
2586 case ARM::t2STRB_PRE:
2589 case ARM::t2STRH_POST:
2590 case ARM::t2STRH_PRE:
2592 case ARM::t2STR_POST:
2593 case ARM::t2STR_PRE:
2599 // Return the number of 32-bit words loaded by LDM or stored by STM. If this
2600 // can't be easily determined return 0 (missing MachineMemOperand).
2602 // FIXME: The current MachineInstr design does not support relying on machine
2603 // mem operands to determine the width of a memory access. Instead, we expect
2604 // the target to provide this information based on the instruction opcode and
2605 // operands. However, using MachineMemOperand is a the best solution now for
2608 // 1) getNumMicroOps tries to infer LDM memory width from the total number of MI
2609 // operands. This is much more dangerous than using the MachineMemOperand
2610 // sizes because CodeGen passes can insert/remove optional machine operands. In
2611 // fact, it's totally incorrect for preRA passes and appears to be wrong for
2612 // postRA passes as well.
2614 // 2) getNumLDMAddresses is only used by the scheduling machine model and any
2615 // machine model that calls this should handle the unknown (zero size) case.
2617 // Long term, we should require a target hook that verifies MachineMemOperand
2618 // sizes during MC lowering. That target hook should be local to MC lowering
2619 // because we can't ensure that it is aware of other MI forms. Doing this will
2620 // ensure that MachineMemOperands are correctly propagated through all passes.
2621 unsigned ARMBaseInstrInfo::getNumLDMAddresses(const MachineInstr *MI) const {
2623 for (MachineInstr::mmo_iterator I = MI->memoperands_begin(),
2624 E = MI->memoperands_end(); I != E; ++I) {
2625 Size += (*I)->getSize();
2631 ARMBaseInstrInfo::getNumMicroOps(const InstrItineraryData *ItinData,
2632 const MachineInstr *MI) const {
2633 if (!ItinData || ItinData->isEmpty())
2636 const MCInstrDesc &Desc = MI->getDesc();
2637 unsigned Class = Desc.getSchedClass();
2638 int ItinUOps = ItinData->getNumMicroOps(Class);
2639 if (ItinUOps >= 0) {
2640 if (Subtarget.isSwift() && (Desc.mayLoad() || Desc.mayStore()))
2641 return getNumMicroOpsSwiftLdSt(ItinData, MI);
2646 unsigned Opc = MI->getOpcode();
2649 llvm_unreachable("Unexpected multi-uops instruction!");
2654 // The number of uOps for load / store multiple are determined by the number
2657 // On Cortex-A8, each pair of register loads / stores can be scheduled on the
2658 // same cycle. The scheduling for the first load / store must be done
2659 // separately by assuming the address is not 64-bit aligned.
2661 // On Cortex-A9, the formula is simply (#reg / 2) + (#reg % 2). If the address
2662 // is not 64-bit aligned, then AGU would take an extra cycle. For VFP / NEON
2663 // load / store multiple, the formula is (#reg / 2) + (#reg % 2) + 1.
2665 case ARM::VLDMDIA_UPD:
2666 case ARM::VLDMDDB_UPD:
2668 case ARM::VLDMSIA_UPD:
2669 case ARM::VLDMSDB_UPD:
2671 case ARM::VSTMDIA_UPD:
2672 case ARM::VSTMDDB_UPD:
2674 case ARM::VSTMSIA_UPD:
2675 case ARM::VSTMSDB_UPD: {
2676 unsigned NumRegs = MI->getNumOperands() - Desc.getNumOperands();
2677 return (NumRegs / 2) + (NumRegs % 2) + 1;
2680 case ARM::LDMIA_RET:
2685 case ARM::LDMIA_UPD:
2686 case ARM::LDMDA_UPD:
2687 case ARM::LDMDB_UPD:
2688 case ARM::LDMIB_UPD:
2693 case ARM::STMIA_UPD:
2694 case ARM::STMDA_UPD:
2695 case ARM::STMDB_UPD:
2696 case ARM::STMIB_UPD:
2698 case ARM::tLDMIA_UPD:
2699 case ARM::tSTMIA_UPD:
2703 case ARM::t2LDMIA_RET:
2706 case ARM::t2LDMIA_UPD:
2707 case ARM::t2LDMDB_UPD:
2710 case ARM::t2STMIA_UPD:
2711 case ARM::t2STMDB_UPD: {
2712 unsigned NumRegs = MI->getNumOperands() - Desc.getNumOperands() + 1;
2713 if (Subtarget.isSwift()) {
2715 int UOps = 1 + NumRegs; // One for address computation, one for each ld / st.
2718 case ARM::VLDMDIA_UPD:
2719 case ARM::VLDMDDB_UPD:
2720 case ARM::VLDMSIA_UPD:
2721 case ARM::VLDMSDB_UPD:
2722 case ARM::VSTMDIA_UPD:
2723 case ARM::VSTMDDB_UPD:
2724 case ARM::VSTMSIA_UPD:
2725 case ARM::VSTMSDB_UPD:
2726 case ARM::LDMIA_UPD:
2727 case ARM::LDMDA_UPD:
2728 case ARM::LDMDB_UPD:
2729 case ARM::LDMIB_UPD:
2730 case ARM::STMIA_UPD:
2731 case ARM::STMDA_UPD:
2732 case ARM::STMDB_UPD:
2733 case ARM::STMIB_UPD:
2734 case ARM::tLDMIA_UPD:
2735 case ARM::tSTMIA_UPD:
2736 case ARM::t2LDMIA_UPD:
2737 case ARM::t2LDMDB_UPD:
2738 case ARM::t2STMIA_UPD:
2739 case ARM::t2STMDB_UPD:
2740 ++UOps; // One for base register writeback.
2742 case ARM::LDMIA_RET:
2744 case ARM::t2LDMIA_RET:
2745 UOps += 2; // One for base reg wb, one for write to pc.
2749 } else if (Subtarget.isCortexA8()) {
2752 // 4 registers would be issued: 2, 2.
2753 // 5 registers would be issued: 2, 2, 1.
2754 int A8UOps = (NumRegs / 2);
2758 } else if (Subtarget.isLikeA9() || Subtarget.isSwift()) {
2759 int A9UOps = (NumRegs / 2);
2760 // If there are odd number of registers or if it's not 64-bit aligned,
2761 // then it takes an extra AGU (Address Generation Unit) cycle.
2762 if ((NumRegs % 2) ||
2763 !MI->hasOneMemOperand() ||
2764 (*MI->memoperands_begin())->getAlignment() < 8)
2768 // Assume the worst.
2776 ARMBaseInstrInfo::getVLDMDefCycle(const InstrItineraryData *ItinData,
2777 const MCInstrDesc &DefMCID,
2779 unsigned DefIdx, unsigned DefAlign) const {
2780 int RegNo = (int)(DefIdx+1) - DefMCID.getNumOperands() + 1;
2782 // Def is the address writeback.
2783 return ItinData->getOperandCycle(DefClass, DefIdx);
2786 if (Subtarget.isCortexA8()) {
2787 // (regno / 2) + (regno % 2) + 1
2788 DefCycle = RegNo / 2 + 1;
2791 } else if (Subtarget.isLikeA9() || Subtarget.isSwift()) {
2793 bool isSLoad = false;
2795 switch (DefMCID.getOpcode()) {
2798 case ARM::VLDMSIA_UPD:
2799 case ARM::VLDMSDB_UPD:
2804 // If there are odd number of 'S' registers or if it's not 64-bit aligned,
2805 // then it takes an extra cycle.
2806 if ((isSLoad && (RegNo % 2)) || DefAlign < 8)
2809 // Assume the worst.
2810 DefCycle = RegNo + 2;
2817 ARMBaseInstrInfo::getLDMDefCycle(const InstrItineraryData *ItinData,
2818 const MCInstrDesc &DefMCID,
2820 unsigned DefIdx, unsigned DefAlign) const {
2821 int RegNo = (int)(DefIdx+1) - DefMCID.getNumOperands() + 1;
2823 // Def is the address writeback.
2824 return ItinData->getOperandCycle(DefClass, DefIdx);
2827 if (Subtarget.isCortexA8()) {
2828 // 4 registers would be issued: 1, 2, 1.
2829 // 5 registers would be issued: 1, 2, 2.
2830 DefCycle = RegNo / 2;
2833 // Result latency is issue cycle + 2: E2.
2835 } else if (Subtarget.isLikeA9() || Subtarget.isSwift()) {
2836 DefCycle = (RegNo / 2);
2837 // If there are odd number of registers or if it's not 64-bit aligned,
2838 // then it takes an extra AGU (Address Generation Unit) cycle.
2839 if ((RegNo % 2) || DefAlign < 8)
2841 // Result latency is AGU cycles + 2.
2844 // Assume the worst.
2845 DefCycle = RegNo + 2;
2852 ARMBaseInstrInfo::getVSTMUseCycle(const InstrItineraryData *ItinData,
2853 const MCInstrDesc &UseMCID,
2855 unsigned UseIdx, unsigned UseAlign) const {
2856 int RegNo = (int)(UseIdx+1) - UseMCID.getNumOperands() + 1;
2858 return ItinData->getOperandCycle(UseClass, UseIdx);
2861 if (Subtarget.isCortexA8()) {
2862 // (regno / 2) + (regno % 2) + 1
2863 UseCycle = RegNo / 2 + 1;
2866 } else if (Subtarget.isLikeA9() || Subtarget.isSwift()) {
2868 bool isSStore = false;
2870 switch (UseMCID.getOpcode()) {
2873 case ARM::VSTMSIA_UPD:
2874 case ARM::VSTMSDB_UPD:
2879 // If there are odd number of 'S' registers or if it's not 64-bit aligned,
2880 // then it takes an extra cycle.
2881 if ((isSStore && (RegNo % 2)) || UseAlign < 8)
2884 // Assume the worst.
2885 UseCycle = RegNo + 2;
2892 ARMBaseInstrInfo::getSTMUseCycle(const InstrItineraryData *ItinData,
2893 const MCInstrDesc &UseMCID,
2895 unsigned UseIdx, unsigned UseAlign) const {
2896 int RegNo = (int)(UseIdx+1) - UseMCID.getNumOperands() + 1;
2898 return ItinData->getOperandCycle(UseClass, UseIdx);
2901 if (Subtarget.isCortexA8()) {
2902 UseCycle = RegNo / 2;
2907 } else if (Subtarget.isLikeA9() || Subtarget.isSwift()) {
2908 UseCycle = (RegNo / 2);
2909 // If there are odd number of registers or if it's not 64-bit aligned,
2910 // then it takes an extra AGU (Address Generation Unit) cycle.
2911 if ((RegNo % 2) || UseAlign < 8)
2914 // Assume the worst.
2921 ARMBaseInstrInfo::getOperandLatency(const InstrItineraryData *ItinData,
2922 const MCInstrDesc &DefMCID,
2923 unsigned DefIdx, unsigned DefAlign,
2924 const MCInstrDesc &UseMCID,
2925 unsigned UseIdx, unsigned UseAlign) const {
2926 unsigned DefClass = DefMCID.getSchedClass();
2927 unsigned UseClass = UseMCID.getSchedClass();
2929 if (DefIdx < DefMCID.getNumDefs() && UseIdx < UseMCID.getNumOperands())
2930 return ItinData->getOperandLatency(DefClass, DefIdx, UseClass, UseIdx);
2932 // This may be a def / use of a variable_ops instruction, the operand
2933 // latency might be determinable dynamically. Let the target try to
2936 bool LdmBypass = false;
2937 switch (DefMCID.getOpcode()) {
2939 DefCycle = ItinData->getOperandCycle(DefClass, DefIdx);
2943 case ARM::VLDMDIA_UPD:
2944 case ARM::VLDMDDB_UPD:
2946 case ARM::VLDMSIA_UPD:
2947 case ARM::VLDMSDB_UPD:
2948 DefCycle = getVLDMDefCycle(ItinData, DefMCID, DefClass, DefIdx, DefAlign);
2951 case ARM::LDMIA_RET:
2956 case ARM::LDMIA_UPD:
2957 case ARM::LDMDA_UPD:
2958 case ARM::LDMDB_UPD:
2959 case ARM::LDMIB_UPD:
2961 case ARM::tLDMIA_UPD:
2963 case ARM::t2LDMIA_RET:
2966 case ARM::t2LDMIA_UPD:
2967 case ARM::t2LDMDB_UPD:
2969 DefCycle = getLDMDefCycle(ItinData, DefMCID, DefClass, DefIdx, DefAlign);
2974 // We can't seem to determine the result latency of the def, assume it's 2.
2978 switch (UseMCID.getOpcode()) {
2980 UseCycle = ItinData->getOperandCycle(UseClass, UseIdx);
2984 case ARM::VSTMDIA_UPD:
2985 case ARM::VSTMDDB_UPD:
2987 case ARM::VSTMSIA_UPD:
2988 case ARM::VSTMSDB_UPD:
2989 UseCycle = getVSTMUseCycle(ItinData, UseMCID, UseClass, UseIdx, UseAlign);
2996 case ARM::STMIA_UPD:
2997 case ARM::STMDA_UPD:
2998 case ARM::STMDB_UPD:
2999 case ARM::STMIB_UPD:
3000 case ARM::tSTMIA_UPD:
3005 case ARM::t2STMIA_UPD:
3006 case ARM::t2STMDB_UPD:
3007 UseCycle = getSTMUseCycle(ItinData, UseMCID, UseClass, UseIdx, UseAlign);
3012 // Assume it's read in the first stage.
3015 UseCycle = DefCycle - UseCycle + 1;
3018 // It's a variable_ops instruction so we can't use DefIdx here. Just use
3019 // first def operand.
3020 if (ItinData->hasPipelineForwarding(DefClass, DefMCID.getNumOperands()-1,
3023 } else if (ItinData->hasPipelineForwarding(DefClass, DefIdx,
3024 UseClass, UseIdx)) {
3032 static const MachineInstr *getBundledDefMI(const TargetRegisterInfo *TRI,
3033 const MachineInstr *MI, unsigned Reg,
3034 unsigned &DefIdx, unsigned &Dist) {
3037 MachineBasicBlock::const_iterator I = MI; ++I;
3038 MachineBasicBlock::const_instr_iterator II =
3039 llvm::prior(I.getInstrIterator());
3040 assert(II->isInsideBundle() && "Empty bundle?");
3043 while (II->isInsideBundle()) {
3044 Idx = II->findRegisterDefOperandIdx(Reg, false, true, TRI);
3051 assert(Idx != -1 && "Cannot find bundled definition!");
3056 static const MachineInstr *getBundledUseMI(const TargetRegisterInfo *TRI,
3057 const MachineInstr *MI, unsigned Reg,
3058 unsigned &UseIdx, unsigned &Dist) {
3061 MachineBasicBlock::const_instr_iterator II = MI; ++II;
3062 assert(II->isInsideBundle() && "Empty bundle?");
3063 MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
3065 // FIXME: This doesn't properly handle multiple uses.
3067 while (II != E && II->isInsideBundle()) {
3068 Idx = II->findRegisterUseOperandIdx(Reg, false, TRI);
3071 if (II->getOpcode() != ARM::t2IT)
3085 /// Return the number of cycles to add to (or subtract from) the static
3086 /// itinerary based on the def opcode and alignment. The caller will ensure that
3087 /// adjusted latency is at least one cycle.
3088 static int adjustDefLatency(const ARMSubtarget &Subtarget,
3089 const MachineInstr *DefMI,
3090 const MCInstrDesc *DefMCID, unsigned DefAlign) {
3092 if (Subtarget.isCortexA8() || Subtarget.isLikeA9()) {
3093 // FIXME: Shifter op hack: no shift (i.e. [r +/- r]) or [r + r << 2]
3094 // variants are one cycle cheaper.
3095 switch (DefMCID->getOpcode()) {
3099 unsigned ShOpVal = DefMI->getOperand(3).getImm();
3100 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
3102 (ShImm == 2 && ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl))
3109 case ARM::t2LDRSHs: {
3110 // Thumb2 mode: lsl only.
3111 unsigned ShAmt = DefMI->getOperand(3).getImm();
3112 if (ShAmt == 0 || ShAmt == 2)
3117 } else if (Subtarget.isSwift()) {
3118 // FIXME: Properly handle all of the latency adjustments for address
3120 switch (DefMCID->getOpcode()) {
3124 unsigned ShOpVal = DefMI->getOperand(3).getImm();
3125 bool isSub = ARM_AM::getAM2Op(ShOpVal) == ARM_AM::sub;
3126 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
3129 ((ShImm == 1 || ShImm == 2 || ShImm == 3) &&
3130 ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl)))
3133 ShImm == 1 && ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsr)
3140 case ARM::t2LDRSHs: {
3141 // Thumb2 mode: lsl only.
3142 unsigned ShAmt = DefMI->getOperand(3).getImm();
3143 if (ShAmt == 0 || ShAmt == 1 || ShAmt == 2 || ShAmt == 3)
3150 if (DefAlign < 8 && Subtarget.isLikeA9()) {
3151 switch (DefMCID->getOpcode()) {
3157 case ARM::VLD1q8wb_fixed:
3158 case ARM::VLD1q16wb_fixed:
3159 case ARM::VLD1q32wb_fixed:
3160 case ARM::VLD1q64wb_fixed:
3161 case ARM::VLD1q8wb_register:
3162 case ARM::VLD1q16wb_register:
3163 case ARM::VLD1q32wb_register:
3164 case ARM::VLD1q64wb_register:
3171 case ARM::VLD2d8wb_fixed:
3172 case ARM::VLD2d16wb_fixed:
3173 case ARM::VLD2d32wb_fixed:
3174 case ARM::VLD2q8wb_fixed:
3175 case ARM::VLD2q16wb_fixed:
3176 case ARM::VLD2q32wb_fixed:
3177 case ARM::VLD2d8wb_register:
3178 case ARM::VLD2d16wb_register:
3179 case ARM::VLD2d32wb_register:
3180 case ARM::VLD2q8wb_register:
3181 case ARM::VLD2q16wb_register:
3182 case ARM::VLD2q32wb_register:
3187 case ARM::VLD3d8_UPD:
3188 case ARM::VLD3d16_UPD:
3189 case ARM::VLD3d32_UPD:
3190 case ARM::VLD1d64Twb_fixed:
3191 case ARM::VLD1d64Twb_register:
3192 case ARM::VLD3q8_UPD:
3193 case ARM::VLD3q16_UPD:
3194 case ARM::VLD3q32_UPD:
3199 case ARM::VLD4d8_UPD:
3200 case ARM::VLD4d16_UPD:
3201 case ARM::VLD4d32_UPD:
3202 case ARM::VLD1d64Qwb_fixed:
3203 case ARM::VLD1d64Qwb_register:
3204 case ARM::VLD4q8_UPD:
3205 case ARM::VLD4q16_UPD:
3206 case ARM::VLD4q32_UPD:
3207 case ARM::VLD1DUPq8:
3208 case ARM::VLD1DUPq16:
3209 case ARM::VLD1DUPq32:
3210 case ARM::VLD1DUPq8wb_fixed:
3211 case ARM::VLD1DUPq16wb_fixed:
3212 case ARM::VLD1DUPq32wb_fixed:
3213 case ARM::VLD1DUPq8wb_register:
3214 case ARM::VLD1DUPq16wb_register:
3215 case ARM::VLD1DUPq32wb_register:
3216 case ARM::VLD2DUPd8:
3217 case ARM::VLD2DUPd16:
3218 case ARM::VLD2DUPd32:
3219 case ARM::VLD2DUPd8wb_fixed:
3220 case ARM::VLD2DUPd16wb_fixed:
3221 case ARM::VLD2DUPd32wb_fixed:
3222 case ARM::VLD2DUPd8wb_register:
3223 case ARM::VLD2DUPd16wb_register:
3224 case ARM::VLD2DUPd32wb_register:
3225 case ARM::VLD4DUPd8:
3226 case ARM::VLD4DUPd16:
3227 case ARM::VLD4DUPd32:
3228 case ARM::VLD4DUPd8_UPD:
3229 case ARM::VLD4DUPd16_UPD:
3230 case ARM::VLD4DUPd32_UPD:
3232 case ARM::VLD1LNd16:
3233 case ARM::VLD1LNd32:
3234 case ARM::VLD1LNd8_UPD:
3235 case ARM::VLD1LNd16_UPD:
3236 case ARM::VLD1LNd32_UPD:
3238 case ARM::VLD2LNd16:
3239 case ARM::VLD2LNd32:
3240 case ARM::VLD2LNq16:
3241 case ARM::VLD2LNq32:
3242 case ARM::VLD2LNd8_UPD:
3243 case ARM::VLD2LNd16_UPD:
3244 case ARM::VLD2LNd32_UPD:
3245 case ARM::VLD2LNq16_UPD:
3246 case ARM::VLD2LNq32_UPD:
3248 case ARM::VLD4LNd16:
3249 case ARM::VLD4LNd32:
3250 case ARM::VLD4LNq16:
3251 case ARM::VLD4LNq32:
3252 case ARM::VLD4LNd8_UPD:
3253 case ARM::VLD4LNd16_UPD:
3254 case ARM::VLD4LNd32_UPD:
3255 case ARM::VLD4LNq16_UPD:
3256 case ARM::VLD4LNq32_UPD:
3257 // If the address is not 64-bit aligned, the latencies of these
3258 // instructions increases by one.
3269 ARMBaseInstrInfo::getOperandLatency(const InstrItineraryData *ItinData,
3270 const MachineInstr *DefMI, unsigned DefIdx,
3271 const MachineInstr *UseMI,
3272 unsigned UseIdx) const {
3273 // No operand latency. The caller may fall back to getInstrLatency.
3274 if (!ItinData || ItinData->isEmpty())
3277 const MachineOperand &DefMO = DefMI->getOperand(DefIdx);
3278 unsigned Reg = DefMO.getReg();
3279 const MCInstrDesc *DefMCID = &DefMI->getDesc();
3280 const MCInstrDesc *UseMCID = &UseMI->getDesc();
3282 unsigned DefAdj = 0;
3283 if (DefMI->isBundle()) {
3284 DefMI = getBundledDefMI(&getRegisterInfo(), DefMI, Reg, DefIdx, DefAdj);
3285 DefMCID = &DefMI->getDesc();
3287 if (DefMI->isCopyLike() || DefMI->isInsertSubreg() ||
3288 DefMI->isRegSequence() || DefMI->isImplicitDef()) {
3292 unsigned UseAdj = 0;
3293 if (UseMI->isBundle()) {
3295 const MachineInstr *NewUseMI = getBundledUseMI(&getRegisterInfo(), UseMI,
3296 Reg, NewUseIdx, UseAdj);
3302 UseMCID = &UseMI->getDesc();
3305 if (Reg == ARM::CPSR) {
3306 if (DefMI->getOpcode() == ARM::FMSTAT) {
3307 // fpscr -> cpsr stalls over 20 cycles on A8 (and earlier?)
3308 return Subtarget.isLikeA9() ? 1 : 20;
3311 // CPSR set and branch can be paired in the same cycle.
3312 if (UseMI->isBranch())
3315 // Otherwise it takes the instruction latency (generally one).
3316 unsigned Latency = getInstrLatency(ItinData, DefMI);
3318 // For Thumb2 and -Os, prefer scheduling CPSR setting instruction close to
3319 // its uses. Instructions which are otherwise scheduled between them may
3320 // incur a code size penalty (not able to use the CPSR setting 16-bit
3322 if (Latency > 0 && Subtarget.isThumb2()) {
3323 const MachineFunction *MF = DefMI->getParent()->getParent();
3324 if (MF->getFunction()->getFnAttributes().
3325 hasAttribute(Attributes::OptimizeForSize))
3331 if (DefMO.isImplicit() || UseMI->getOperand(UseIdx).isImplicit())
3334 unsigned DefAlign = DefMI->hasOneMemOperand()
3335 ? (*DefMI->memoperands_begin())->getAlignment() : 0;
3336 unsigned UseAlign = UseMI->hasOneMemOperand()
3337 ? (*UseMI->memoperands_begin())->getAlignment() : 0;
3339 // Get the itinerary's latency if possible, and handle variable_ops.
3340 int Latency = getOperandLatency(ItinData, *DefMCID, DefIdx, DefAlign,
3341 *UseMCID, UseIdx, UseAlign);
3342 // Unable to find operand latency. The caller may resort to getInstrLatency.
3346 // Adjust for IT block position.
3347 int Adj = DefAdj + UseAdj;
3349 // Adjust for dynamic def-side opcode variants not captured by the itinerary.
3350 Adj += adjustDefLatency(Subtarget, DefMI, DefMCID, DefAlign);
3351 if (Adj >= 0 || (int)Latency > -Adj) {
3352 return Latency + Adj;
3354 // Return the itinerary latency, which may be zero but not less than zero.
3359 ARMBaseInstrInfo::getOperandLatency(const InstrItineraryData *ItinData,
3360 SDNode *DefNode, unsigned DefIdx,
3361 SDNode *UseNode, unsigned UseIdx) const {
3362 if (!DefNode->isMachineOpcode())
3365 const MCInstrDesc &DefMCID = get(DefNode->getMachineOpcode());
3367 if (isZeroCost(DefMCID.Opcode))
3370 if (!ItinData || ItinData->isEmpty())
3371 return DefMCID.mayLoad() ? 3 : 1;
3373 if (!UseNode->isMachineOpcode()) {
3374 int Latency = ItinData->getOperandCycle(DefMCID.getSchedClass(), DefIdx);
3375 if (Subtarget.isLikeA9() || Subtarget.isSwift())
3376 return Latency <= 2 ? 1 : Latency - 1;
3378 return Latency <= 3 ? 1 : Latency - 2;
3381 const MCInstrDesc &UseMCID = get(UseNode->getMachineOpcode());
3382 const MachineSDNode *DefMN = dyn_cast<MachineSDNode>(DefNode);
3383 unsigned DefAlign = !DefMN->memoperands_empty()
3384 ? (*DefMN->memoperands_begin())->getAlignment() : 0;
3385 const MachineSDNode *UseMN = dyn_cast<MachineSDNode>(UseNode);
3386 unsigned UseAlign = !UseMN->memoperands_empty()
3387 ? (*UseMN->memoperands_begin())->getAlignment() : 0;
3388 int Latency = getOperandLatency(ItinData, DefMCID, DefIdx, DefAlign,
3389 UseMCID, UseIdx, UseAlign);
3392 (Subtarget.isCortexA8() || Subtarget.isLikeA9())) {
3393 // FIXME: Shifter op hack: no shift (i.e. [r +/- r]) or [r + r << 2]
3394 // variants are one cycle cheaper.
3395 switch (DefMCID.getOpcode()) {
3400 cast<ConstantSDNode>(DefNode->getOperand(2))->getZExtValue();
3401 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
3403 (ShImm == 2 && ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl))
3410 case ARM::t2LDRSHs: {
3411 // Thumb2 mode: lsl only.
3413 cast<ConstantSDNode>(DefNode->getOperand(2))->getZExtValue();
3414 if (ShAmt == 0 || ShAmt == 2)
3419 } else if (DefIdx == 0 && Latency > 2 && Subtarget.isSwift()) {
3420 // FIXME: Properly handle all of the latency adjustments for address
3422 switch (DefMCID.getOpcode()) {
3427 cast<ConstantSDNode>(DefNode->getOperand(2))->getZExtValue();
3428 unsigned ShImm = ARM_AM::getAM2Offset(ShOpVal);
3430 ((ShImm == 1 || ShImm == 2 || ShImm == 3) &&
3431 ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsl))
3433 else if (ShImm == 1 && ARM_AM::getAM2ShiftOpc(ShOpVal) == ARM_AM::lsr)
3440 case ARM::t2LDRSHs: {
3441 // Thumb2 mode: lsl 0-3 only.
3448 if (DefAlign < 8 && Subtarget.isLikeA9())
3449 switch (DefMCID.getOpcode()) {
3455 case ARM::VLD1q8wb_register:
3456 case ARM::VLD1q16wb_register:
3457 case ARM::VLD1q32wb_register:
3458 case ARM::VLD1q64wb_register:
3459 case ARM::VLD1q8wb_fixed:
3460 case ARM::VLD1q16wb_fixed:
3461 case ARM::VLD1q32wb_fixed:
3462 case ARM::VLD1q64wb_fixed:
3466 case ARM::VLD2q8Pseudo:
3467 case ARM::VLD2q16Pseudo:
3468 case ARM::VLD2q32Pseudo:
3469 case ARM::VLD2d8wb_fixed:
3470 case ARM::VLD2d16wb_fixed:
3471 case ARM::VLD2d32wb_fixed:
3472 case ARM::VLD2q8PseudoWB_fixed:
3473 case ARM::VLD2q16PseudoWB_fixed:
3474 case ARM::VLD2q32PseudoWB_fixed:
3475 case ARM::VLD2d8wb_register:
3476 case ARM::VLD2d16wb_register:
3477 case ARM::VLD2d32wb_register:
3478 case ARM::VLD2q8PseudoWB_register:
3479 case ARM::VLD2q16PseudoWB_register:
3480 case ARM::VLD2q32PseudoWB_register:
3481 case ARM::VLD3d8Pseudo:
3482 case ARM::VLD3d16Pseudo:
3483 case ARM::VLD3d32Pseudo:
3484 case ARM::VLD1d64TPseudo:
3485 case ARM::VLD3d8Pseudo_UPD:
3486 case ARM::VLD3d16Pseudo_UPD:
3487 case ARM::VLD3d32Pseudo_UPD:
3488 case ARM::VLD3q8Pseudo_UPD:
3489 case ARM::VLD3q16Pseudo_UPD:
3490 case ARM::VLD3q32Pseudo_UPD:
3491 case ARM::VLD3q8oddPseudo:
3492 case ARM::VLD3q16oddPseudo:
3493 case ARM::VLD3q32oddPseudo:
3494 case ARM::VLD3q8oddPseudo_UPD:
3495 case ARM::VLD3q16oddPseudo_UPD:
3496 case ARM::VLD3q32oddPseudo_UPD:
3497 case ARM::VLD4d8Pseudo:
3498 case ARM::VLD4d16Pseudo:
3499 case ARM::VLD4d32Pseudo:
3500 case ARM::VLD1d64QPseudo:
3501 case ARM::VLD4d8Pseudo_UPD:
3502 case ARM::VLD4d16Pseudo_UPD:
3503 case ARM::VLD4d32Pseudo_UPD:
3504 case ARM::VLD4q8Pseudo_UPD:
3505 case ARM::VLD4q16Pseudo_UPD:
3506 case ARM::VLD4q32Pseudo_UPD:
3507 case ARM::VLD4q8oddPseudo:
3508 case ARM::VLD4q16oddPseudo:
3509 case ARM::VLD4q32oddPseudo:
3510 case ARM::VLD4q8oddPseudo_UPD:
3511 case ARM::VLD4q16oddPseudo_UPD:
3512 case ARM::VLD4q32oddPseudo_UPD:
3513 case ARM::VLD1DUPq8:
3514 case ARM::VLD1DUPq16:
3515 case ARM::VLD1DUPq32:
3516 case ARM::VLD1DUPq8wb_fixed:
3517 case ARM::VLD1DUPq16wb_fixed:
3518 case ARM::VLD1DUPq32wb_fixed:
3519 case ARM::VLD1DUPq8wb_register:
3520 case ARM::VLD1DUPq16wb_register:
3521 case ARM::VLD1DUPq32wb_register:
3522 case ARM::VLD2DUPd8:
3523 case ARM::VLD2DUPd16:
3524 case ARM::VLD2DUPd32:
3525 case ARM::VLD2DUPd8wb_fixed:
3526 case ARM::VLD2DUPd16wb_fixed:
3527 case ARM::VLD2DUPd32wb_fixed:
3528 case ARM::VLD2DUPd8wb_register:
3529 case ARM::VLD2DUPd16wb_register:
3530 case ARM::VLD2DUPd32wb_register:
3531 case ARM::VLD4DUPd8Pseudo:
3532 case ARM::VLD4DUPd16Pseudo:
3533 case ARM::VLD4DUPd32Pseudo:
3534 case ARM::VLD4DUPd8Pseudo_UPD:
3535 case ARM::VLD4DUPd16Pseudo_UPD:
3536 case ARM::VLD4DUPd32Pseudo_UPD:
3537 case ARM::VLD1LNq8Pseudo:
3538 case ARM::VLD1LNq16Pseudo:
3539 case ARM::VLD1LNq32Pseudo:
3540 case ARM::VLD1LNq8Pseudo_UPD:
3541 case ARM::VLD1LNq16Pseudo_UPD:
3542 case ARM::VLD1LNq32Pseudo_UPD:
3543 case ARM::VLD2LNd8Pseudo:
3544 case ARM::VLD2LNd16Pseudo:
3545 case ARM::VLD2LNd32Pseudo:
3546 case ARM::VLD2LNq16Pseudo:
3547 case ARM::VLD2LNq32Pseudo:
3548 case ARM::VLD2LNd8Pseudo_UPD:
3549 case ARM::VLD2LNd16Pseudo_UPD:
3550 case ARM::VLD2LNd32Pseudo_UPD:
3551 case ARM::VLD2LNq16Pseudo_UPD:
3552 case ARM::VLD2LNq32Pseudo_UPD:
3553 case ARM::VLD4LNd8Pseudo:
3554 case ARM::VLD4LNd16Pseudo:
3555 case ARM::VLD4LNd32Pseudo:
3556 case ARM::VLD4LNq16Pseudo:
3557 case ARM::VLD4LNq32Pseudo:
3558 case ARM::VLD4LNd8Pseudo_UPD:
3559 case ARM::VLD4LNd16Pseudo_UPD:
3560 case ARM::VLD4LNd32Pseudo_UPD:
3561 case ARM::VLD4LNq16Pseudo_UPD:
3562 case ARM::VLD4LNq32Pseudo_UPD:
3563 // If the address is not 64-bit aligned, the latencies of these
3564 // instructions increases by one.
3572 unsigned ARMBaseInstrInfo::getInstrLatency(const InstrItineraryData *ItinData,
3573 const MachineInstr *MI,
3574 unsigned *PredCost) const {
3575 if (MI->isCopyLike() || MI->isInsertSubreg() ||
3576 MI->isRegSequence() || MI->isImplicitDef())
3579 // An instruction scheduler typically runs on unbundled instructions, however
3580 // other passes may query the latency of a bundled instruction.
3581 if (MI->isBundle()) {
3582 unsigned Latency = 0;
3583 MachineBasicBlock::const_instr_iterator I = MI;
3584 MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
3585 while (++I != E && I->isInsideBundle()) {
3586 if (I->getOpcode() != ARM::t2IT)
3587 Latency += getInstrLatency(ItinData, I, PredCost);
3592 const MCInstrDesc &MCID = MI->getDesc();
3593 if (PredCost && (MCID.isCall() || MCID.hasImplicitDefOfPhysReg(ARM::CPSR))) {
3594 // When predicated, CPSR is an additional source operand for CPSR updating
3595 // instructions, this apparently increases their latencies.
3598 // Be sure to call getStageLatency for an empty itinerary in case it has a
3599 // valid MinLatency property.
3601 return MI->mayLoad() ? 3 : 1;
3603 unsigned Class = MCID.getSchedClass();
3605 // For instructions with variable uops, use uops as latency.
3606 if (!ItinData->isEmpty() && ItinData->getNumMicroOps(Class) < 0)
3607 return getNumMicroOps(ItinData, MI);
3609 // For the common case, fall back on the itinerary's latency.
3610 unsigned Latency = ItinData->getStageLatency(Class);
3612 // Adjust for dynamic def-side opcode variants not captured by the itinerary.
3613 unsigned DefAlign = MI->hasOneMemOperand()
3614 ? (*MI->memoperands_begin())->getAlignment() : 0;
3615 int Adj = adjustDefLatency(Subtarget, MI, &MCID, DefAlign);
3616 if (Adj >= 0 || (int)Latency > -Adj) {
3617 return Latency + Adj;
3622 int ARMBaseInstrInfo::getInstrLatency(const InstrItineraryData *ItinData,
3623 SDNode *Node) const {
3624 if (!Node->isMachineOpcode())
3627 if (!ItinData || ItinData->isEmpty())
3630 unsigned Opcode = Node->getMachineOpcode();
3633 return ItinData->getStageLatency(get(Opcode).getSchedClass());
3640 bool ARMBaseInstrInfo::
3641 hasHighOperandLatency(const InstrItineraryData *ItinData,
3642 const MachineRegisterInfo *MRI,
3643 const MachineInstr *DefMI, unsigned DefIdx,
3644 const MachineInstr *UseMI, unsigned UseIdx) const {
3645 unsigned DDomain = DefMI->getDesc().TSFlags & ARMII::DomainMask;
3646 unsigned UDomain = UseMI->getDesc().TSFlags & ARMII::DomainMask;
3647 if (Subtarget.isCortexA8() &&
3648 (DDomain == ARMII::DomainVFP || UDomain == ARMII::DomainVFP))
3649 // CortexA8 VFP instructions are not pipelined.
3652 // Hoist VFP / NEON instructions with 4 or higher latency.
3653 int Latency = computeOperandLatency(ItinData, DefMI, DefIdx, UseMI, UseIdx,
3656 Latency = getInstrLatency(ItinData, DefMI);
3659 return DDomain == ARMII::DomainVFP || DDomain == ARMII::DomainNEON ||
3660 UDomain == ARMII::DomainVFP || UDomain == ARMII::DomainNEON;
3663 bool ARMBaseInstrInfo::
3664 hasLowDefLatency(const InstrItineraryData *ItinData,
3665 const MachineInstr *DefMI, unsigned DefIdx) const {
3666 if (!ItinData || ItinData->isEmpty())
3669 unsigned DDomain = DefMI->getDesc().TSFlags & ARMII::DomainMask;
3670 if (DDomain == ARMII::DomainGeneral) {
3671 unsigned DefClass = DefMI->getDesc().getSchedClass();
3672 int DefCycle = ItinData->getOperandCycle(DefClass, DefIdx);
3673 return (DefCycle != -1 && DefCycle <= 2);
3678 bool ARMBaseInstrInfo::verifyInstruction(const MachineInstr *MI,
3679 StringRef &ErrInfo) const {
3680 if (convertAddSubFlagsOpcode(MI->getOpcode())) {
3681 ErrInfo = "Pseudo flag setting opcodes only exist in Selection DAG";
3688 ARMBaseInstrInfo::isFpMLxInstruction(unsigned Opcode, unsigned &MulOpc,
3689 unsigned &AddSubOpc,
3690 bool &NegAcc, bool &HasLane) const {
3691 DenseMap<unsigned, unsigned>::const_iterator I = MLxEntryMap.find(Opcode);
3692 if (I == MLxEntryMap.end())
3695 const ARM_MLxEntry &Entry = ARM_MLxTable[I->second];
3696 MulOpc = Entry.MulOpc;
3697 AddSubOpc = Entry.AddSubOpc;
3698 NegAcc = Entry.NegAcc;
3699 HasLane = Entry.HasLane;
3703 //===----------------------------------------------------------------------===//
3704 // Execution domains.
3705 //===----------------------------------------------------------------------===//
3707 // Some instructions go down the NEON pipeline, some go down the VFP pipeline,
3708 // and some can go down both. The vmov instructions go down the VFP pipeline,
3709 // but they can be changed to vorr equivalents that are executed by the NEON
3712 // We use the following execution domain numbering:
3720 // Also see ARMInstrFormats.td and Domain* enums in ARMBaseInfo.h
3722 std::pair<uint16_t, uint16_t>
3723 ARMBaseInstrInfo::getExecutionDomain(const MachineInstr *MI) const {
3724 // VMOVD, VMOVRS and VMOVSR are VFP instructions, but can be changed to NEON
3725 // if they are not predicated.
3726 if (MI->getOpcode() == ARM::VMOVD && !isPredicated(MI))
3727 return std::make_pair(ExeVFP, (1<<ExeVFP) | (1<<ExeNEON));
3729 // A9-like cores are particularly picky about mixing the two and want these
3731 if (Subtarget.isLikeA9() && !isPredicated(MI) &&
3732 (MI->getOpcode() == ARM::VMOVRS ||
3733 MI->getOpcode() == ARM::VMOVSR ||
3734 MI->getOpcode() == ARM::VMOVS))
3735 return std::make_pair(ExeVFP, (1<<ExeVFP) | (1<<ExeNEON));
3737 // No other instructions can be swizzled, so just determine their domain.
3738 unsigned Domain = MI->getDesc().TSFlags & ARMII::DomainMask;
3740 if (Domain & ARMII::DomainNEON)
3741 return std::make_pair(ExeNEON, 0);
3743 // Certain instructions can go either way on Cortex-A8.
3744 // Treat them as NEON instructions.
3745 if ((Domain & ARMII::DomainNEONA8) && Subtarget.isCortexA8())
3746 return std::make_pair(ExeNEON, 0);
3748 if (Domain & ARMII::DomainVFP)
3749 return std::make_pair(ExeVFP, 0);
3751 return std::make_pair(ExeGeneric, 0);
3754 static unsigned getCorrespondingDRegAndLane(const TargetRegisterInfo *TRI,
3755 unsigned SReg, unsigned &Lane) {
3756 unsigned DReg = TRI->getMatchingSuperReg(SReg, ARM::ssub_0, &ARM::DPRRegClass);
3759 if (DReg != ARM::NoRegister)
3763 DReg = TRI->getMatchingSuperReg(SReg, ARM::ssub_1, &ARM::DPRRegClass);
3765 assert(DReg && "S-register with no D super-register?");
3769 /// getImplicitSPRUseForDPRUse - Given a use of a DPR register and lane,
3770 /// set ImplicitSReg to a register number that must be marked as implicit-use or
3771 /// zero if no register needs to be defined as implicit-use.
3773 /// If the function cannot determine if an SPR should be marked implicit use or
3774 /// not, it returns false.
3776 /// This function handles cases where an instruction is being modified from taking
3777 /// an SPR to a DPR[Lane]. A use of the DPR is being added, which may conflict
3778 /// with an earlier def of an SPR corresponding to DPR[Lane^1] (i.e. the other
3779 /// lane of the DPR).
3781 /// If the other SPR is defined, an implicit-use of it should be added. Else,
3782 /// (including the case where the DPR itself is defined), it should not.
3784 static bool getImplicitSPRUseForDPRUse(const TargetRegisterInfo *TRI,
3786 unsigned DReg, unsigned Lane,
3787 unsigned &ImplicitSReg) {
3788 // If the DPR is defined or used already, the other SPR lane will be chained
3789 // correctly, so there is nothing to be done.
3790 if (MI->definesRegister(DReg, TRI) || MI->readsRegister(DReg, TRI)) {
3795 // Otherwise we need to go searching to see if the SPR is set explicitly.
3796 ImplicitSReg = TRI->getSubReg(DReg,
3797 (Lane & 1) ? ARM::ssub_0 : ARM::ssub_1);
3798 MachineBasicBlock::LivenessQueryResult LQR =
3799 MI->getParent()->computeRegisterLiveness(TRI, ImplicitSReg, MI);
3801 if (LQR == MachineBasicBlock::LQR_Live)
3803 else if (LQR == MachineBasicBlock::LQR_Unknown)
3806 // If the register is known not to be live, there is no need to add an
3813 ARMBaseInstrInfo::setExecutionDomain(MachineInstr *MI, unsigned Domain) const {
3814 unsigned DstReg, SrcReg, DReg;
3816 MachineInstrBuilder MIB(MI);
3817 const TargetRegisterInfo *TRI = &getRegisterInfo();
3818 switch (MI->getOpcode()) {
3820 llvm_unreachable("cannot handle opcode!");
3823 if (Domain != ExeNEON)
3826 // Zap the predicate operands.
3827 assert(!isPredicated(MI) && "Cannot predicate a VORRd");
3829 // Source instruction is %DDst = VMOVD %DSrc, 14, %noreg (; implicits)
3830 DstReg = MI->getOperand(0).getReg();
3831 SrcReg = MI->getOperand(1).getReg();
3833 for (unsigned i = MI->getDesc().getNumOperands(); i; --i)
3834 MI->RemoveOperand(i-1);
3836 // Change to a %DDst = VORRd %DSrc, %DSrc, 14, %noreg (; implicits)
3837 MI->setDesc(get(ARM::VORRd));
3838 AddDefaultPred(MIB.addReg(DstReg, RegState::Define)
3843 if (Domain != ExeNEON)
3845 assert(!isPredicated(MI) && "Cannot predicate a VGETLN");
3847 // Source instruction is %RDst = VMOVRS %SSrc, 14, %noreg (; implicits)
3848 DstReg = MI->getOperand(0).getReg();
3849 SrcReg = MI->getOperand(1).getReg();
3851 for (unsigned i = MI->getDesc().getNumOperands(); i; --i)
3852 MI->RemoveOperand(i-1);
3854 DReg = getCorrespondingDRegAndLane(TRI, SrcReg, Lane);
3856 // Convert to %RDst = VGETLNi32 %DSrc, Lane, 14, %noreg (; imps)
3857 // Note that DSrc has been widened and the other lane may be undef, which
3858 // contaminates the entire register.
3859 MI->setDesc(get(ARM::VGETLNi32));
3860 AddDefaultPred(MIB.addReg(DstReg, RegState::Define)
3861 .addReg(DReg, RegState::Undef)
3864 // The old source should be an implicit use, otherwise we might think it
3865 // was dead before here.
3866 MIB.addReg(SrcReg, RegState::Implicit);
3869 if (Domain != ExeNEON)
3871 assert(!isPredicated(MI) && "Cannot predicate a VSETLN");
3873 // Source instruction is %SDst = VMOVSR %RSrc, 14, %noreg (; implicits)
3874 DstReg = MI->getOperand(0).getReg();
3875 SrcReg = MI->getOperand(1).getReg();
3877 DReg = getCorrespondingDRegAndLane(TRI, DstReg, Lane);
3879 unsigned ImplicitSReg;
3880 if (!getImplicitSPRUseForDPRUse(TRI, MI, DReg, Lane, ImplicitSReg))
3883 for (unsigned i = MI->getDesc().getNumOperands(); i; --i)
3884 MI->RemoveOperand(i-1);
3886 // Convert to %DDst = VSETLNi32 %DDst, %RSrc, Lane, 14, %noreg (; imps)
3887 // Again DDst may be undefined at the beginning of this instruction.
3888 MI->setDesc(get(ARM::VSETLNi32));
3889 MIB.addReg(DReg, RegState::Define)
3890 .addReg(DReg, getUndefRegState(!MI->readsRegister(DReg, TRI)))
3893 AddDefaultPred(MIB);
3895 // The narrower destination must be marked as set to keep previous chains
3897 MIB.addReg(DstReg, RegState::Define | RegState::Implicit);
3898 if (ImplicitSReg != 0)
3899 MIB.addReg(ImplicitSReg, RegState::Implicit);
3903 if (Domain != ExeNEON)
3906 // Source instruction is %SDst = VMOVS %SSrc, 14, %noreg (; implicits)
3907 DstReg = MI->getOperand(0).getReg();
3908 SrcReg = MI->getOperand(1).getReg();
3910 unsigned DstLane = 0, SrcLane = 0, DDst, DSrc;
3911 DDst = getCorrespondingDRegAndLane(TRI, DstReg, DstLane);
3912 DSrc = getCorrespondingDRegAndLane(TRI, SrcReg, SrcLane);
3914 unsigned ImplicitSReg;
3915 if (!getImplicitSPRUseForDPRUse(TRI, MI, DSrc, SrcLane, ImplicitSReg))
3918 for (unsigned i = MI->getDesc().getNumOperands(); i; --i)
3919 MI->RemoveOperand(i-1);
3922 // Destination can be:
3923 // %DDst = VDUPLN32d %DDst, Lane, 14, %noreg (; implicits)
3924 MI->setDesc(get(ARM::VDUPLN32d));
3925 MIB.addReg(DDst, RegState::Define)
3926 .addReg(DDst, getUndefRegState(!MI->readsRegister(DDst, TRI)))
3928 AddDefaultPred(MIB);
3930 // Neither the source or the destination are naturally represented any
3931 // more, so add them in manually.
3932 MIB.addReg(DstReg, RegState::Implicit | RegState::Define);
3933 MIB.addReg(SrcReg, RegState::Implicit);
3934 if (ImplicitSReg != 0)
3935 MIB.addReg(ImplicitSReg, RegState::Implicit);
3939 // In general there's no single instruction that can perform an S <-> S
3940 // move in NEON space, but a pair of VEXT instructions *can* do the
3941 // job. It turns out that the VEXTs needed will only use DSrc once, with
3942 // the position based purely on the combination of lane-0 and lane-1
3943 // involved. For example
3944 // vmov s0, s2 -> vext.32 d0, d0, d1, #1 vext.32 d0, d0, d0, #1
3945 // vmov s1, s3 -> vext.32 d0, d1, d0, #1 vext.32 d0, d0, d0, #1
3946 // vmov s0, s3 -> vext.32 d0, d0, d0, #1 vext.32 d0, d1, d0, #1
3947 // vmov s1, s2 -> vext.32 d0, d0, d0, #1 vext.32 d0, d0, d1, #1
3949 // Pattern of the MachineInstrs is:
3950 // %DDst = VEXTd32 %DSrc1, %DSrc2, Lane, 14, %noreg (;implicits)
3951 MachineInstrBuilder NewMIB;
3952 NewMIB = BuildMI(*MI->getParent(), MI, MI->getDebugLoc(),
3953 get(ARM::VEXTd32), DDst);
3955 // On the first instruction, both DSrc and DDst may be <undef> if present.
3956 // Specifically when the original instruction didn't have them as an
3958 unsigned CurReg = SrcLane == 1 && DstLane == 1 ? DSrc : DDst;
3959 bool CurUndef = !MI->readsRegister(CurReg, TRI);
3960 NewMIB.addReg(CurReg, getUndefRegState(CurUndef));
3962 CurReg = SrcLane == 0 && DstLane == 0 ? DSrc : DDst;
3963 CurUndef = !MI->readsRegister(CurReg, TRI);
3964 NewMIB.addReg(CurReg, getUndefRegState(CurUndef));
3967 AddDefaultPred(NewMIB);
3969 if (SrcLane == DstLane)
3970 NewMIB.addReg(SrcReg, RegState::Implicit);
3972 MI->setDesc(get(ARM::VEXTd32));
3973 MIB.addReg(DDst, RegState::Define);
3975 // On the second instruction, DDst has definitely been defined above, so
3976 // it is not <undef>. DSrc, if present, can be <undef> as above.
3977 CurReg = SrcLane == 1 && DstLane == 0 ? DSrc : DDst;
3978 CurUndef = CurReg == DSrc && !MI->readsRegister(CurReg, TRI);
3979 MIB.addReg(CurReg, getUndefRegState(CurUndef));
3981 CurReg = SrcLane == 0 && DstLane == 1 ? DSrc : DDst;
3982 CurUndef = CurReg == DSrc && !MI->readsRegister(CurReg, TRI);
3983 MIB.addReg(CurReg, getUndefRegState(CurUndef));
3986 AddDefaultPred(MIB);
3988 if (SrcLane != DstLane)
3989 MIB.addReg(SrcReg, RegState::Implicit);
3991 // As before, the original destination is no longer represented, add it
3993 MIB.addReg(DstReg, RegState::Define | RegState::Implicit);
3994 if (ImplicitSReg != 0)
3995 MIB.addReg(ImplicitSReg, RegState::Implicit);
4002 //===----------------------------------------------------------------------===//
4003 // Partial register updates
4004 //===----------------------------------------------------------------------===//
4006 // Swift renames NEON registers with 64-bit granularity. That means any
4007 // instruction writing an S-reg implicitly reads the containing D-reg. The
4008 // problem is mostly avoided by translating f32 operations to v2f32 operations
4009 // on D-registers, but f32 loads are still a problem.
4011 // These instructions can load an f32 into a NEON register:
4013 // VLDRS - Only writes S, partial D update.
4014 // VLD1LNd32 - Writes all D-regs, explicit partial D update, 2 uops.
4015 // VLD1DUPd32 - Writes all D-regs, no partial reg update, 2 uops.
4017 // FCONSTD can be used as a dependency-breaking instruction.
4020 unsigned ARMBaseInstrInfo::
4021 getPartialRegUpdateClearance(const MachineInstr *MI,
4023 const TargetRegisterInfo *TRI) const {
4024 // Only Swift has partial register update problems.
4025 if (!SwiftPartialUpdateClearance || !Subtarget.isSwift())
4028 assert(TRI && "Need TRI instance");
4030 const MachineOperand &MO = MI->getOperand(OpNum);
4033 unsigned Reg = MO.getReg();
4036 switch(MI->getOpcode()) {
4037 // Normal instructions writing only an S-register.
4041 // rdar://problem/8791586
4043 case ARM::VMOVv4i16:
4044 case ARM::VMOVv2i32:
4045 case ARM::VMOVv2f32:
4046 case ARM::VMOVv1i64:
4047 UseOp = MI->findRegisterUseOperandIdx(Reg, false, TRI);
4050 // Explicitly reads the dependency.
4051 case ARM::VLD1LNd32:
4058 // If this instruction actually reads a value from Reg, there is no unwanted
4060 if (UseOp != -1 && MI->getOperand(UseOp).readsReg())
4063 // We must be able to clobber the whole D-reg.
4064 if (TargetRegisterInfo::isVirtualRegister(Reg)) {
4065 // Virtual register must be a foo:ssub_0<def,undef> operand.
4066 if (!MO.getSubReg() || MI->readsVirtualRegister(Reg))
4068 } else if (ARM::SPRRegClass.contains(Reg)) {
4069 // Physical register: MI must define the full D-reg.
4070 unsigned DReg = TRI->getMatchingSuperReg(Reg, ARM::ssub_0,
4072 if (!DReg || !MI->definesRegister(DReg, TRI))
4076 // MI has an unwanted D-register dependency.
4077 // Avoid defs in the previous N instructrions.
4078 return SwiftPartialUpdateClearance;
4081 // Break a partial register dependency after getPartialRegUpdateClearance
4082 // returned non-zero.
4083 void ARMBaseInstrInfo::
4084 breakPartialRegDependency(MachineBasicBlock::iterator MI,
4086 const TargetRegisterInfo *TRI) const {
4087 assert(MI && OpNum < MI->getDesc().getNumDefs() && "OpNum is not a def");
4088 assert(TRI && "Need TRI instance");
4090 const MachineOperand &MO = MI->getOperand(OpNum);
4091 unsigned Reg = MO.getReg();
4092 assert(TargetRegisterInfo::isPhysicalRegister(Reg) &&
4093 "Can't break virtual register dependencies.");
4094 unsigned DReg = Reg;
4096 // If MI defines an S-reg, find the corresponding D super-register.
4097 if (ARM::SPRRegClass.contains(Reg)) {
4098 DReg = ARM::D0 + (Reg - ARM::S0) / 2;
4099 assert(TRI->isSuperRegister(Reg, DReg) && "Register enums broken");
4102 assert(ARM::DPRRegClass.contains(DReg) && "Can only break D-reg deps");
4103 assert(MI->definesRegister(DReg, TRI) && "MI doesn't clobber full D-reg");
4105 // FIXME: In some cases, VLDRS can be changed to a VLD1DUPd32 which defines
4106 // the full D-register by loading the same value to both lanes. The
4107 // instruction is micro-coded with 2 uops, so don't do this until we can
4108 // properly schedule micro-coded instuctions. The dispatcher stalls cause
4109 // too big regressions.
4111 // Insert the dependency-breaking FCONSTD before MI.
4112 // 96 is the encoding of 0.5, but the actual value doesn't matter here.
4113 AddDefaultPred(BuildMI(*MI->getParent(), MI, MI->getDebugLoc(),
4114 get(ARM::FCONSTD), DReg).addImm(96));
4115 MI->addRegisterKilled(DReg, TRI, true);
4118 bool ARMBaseInstrInfo::hasNOP() const {
4119 return (Subtarget.getFeatureBits() & ARM::HasV6T2Ops) != 0;