1 //===-- lib/CodeGen/MachineInstr.cpp --------------------------------------===//
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 // Methods common to all machine instructions.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/MachineInstr.h"
15 #include "llvm/ADT/FoldingSet.h"
16 #include "llvm/ADT/Hashing.h"
17 #include "llvm/Analysis/AliasAnalysis.h"
18 #include "llvm/Assembly/Writer.h"
19 #include "llvm/CodeGen/MachineConstantPool.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineMemOperand.h"
22 #include "llvm/CodeGen/MachineModuleInfo.h"
23 #include "llvm/CodeGen/MachineRegisterInfo.h"
24 #include "llvm/CodeGen/PseudoSourceValue.h"
25 #include "llvm/DebugInfo.h"
26 #include "llvm/IR/Constants.h"
27 #include "llvm/IR/Function.h"
28 #include "llvm/IR/InlineAsm.h"
29 #include "llvm/IR/LLVMContext.h"
30 #include "llvm/IR/Metadata.h"
31 #include "llvm/IR/Module.h"
32 #include "llvm/IR/Type.h"
33 #include "llvm/IR/Value.h"
34 #include "llvm/MC/MCInstrDesc.h"
35 #include "llvm/MC/MCSymbol.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/MathExtras.h"
39 #include "llvm/Support/raw_ostream.h"
40 #include "llvm/Target/TargetInstrInfo.h"
41 #include "llvm/Target/TargetMachine.h"
42 #include "llvm/Target/TargetRegisterInfo.h"
45 //===----------------------------------------------------------------------===//
46 // MachineOperand Implementation
47 //===----------------------------------------------------------------------===//
49 void MachineOperand::setReg(unsigned Reg) {
50 if (getReg() == Reg) return; // No change.
52 // Otherwise, we have to change the register. If this operand is embedded
53 // into a machine function, we need to update the old and new register's
55 if (MachineInstr *MI = getParent())
56 if (MachineBasicBlock *MBB = MI->getParent())
57 if (MachineFunction *MF = MBB->getParent()) {
58 MachineRegisterInfo &MRI = MF->getRegInfo();
59 MRI.removeRegOperandFromUseList(this);
60 SmallContents.RegNo = Reg;
61 MRI.addRegOperandToUseList(this);
65 // Otherwise, just change the register, no problem. :)
66 SmallContents.RegNo = Reg;
69 void MachineOperand::substVirtReg(unsigned Reg, unsigned SubIdx,
70 const TargetRegisterInfo &TRI) {
71 assert(TargetRegisterInfo::isVirtualRegister(Reg));
72 if (SubIdx && getSubReg())
73 SubIdx = TRI.composeSubRegIndices(SubIdx, getSubReg());
79 void MachineOperand::substPhysReg(unsigned Reg, const TargetRegisterInfo &TRI) {
80 assert(TargetRegisterInfo::isPhysicalRegister(Reg));
82 Reg = TRI.getSubReg(Reg, getSubReg());
83 // Note that getSubReg() may return 0 if the sub-register doesn't exist.
84 // That won't happen in legal code.
90 /// Change a def to a use, or a use to a def.
91 void MachineOperand::setIsDef(bool Val) {
92 assert(isReg() && "Wrong MachineOperand accessor");
93 assert((!Val || !isDebug()) && "Marking a debug operation as def");
96 // MRI may keep uses and defs in different list positions.
97 if (MachineInstr *MI = getParent())
98 if (MachineBasicBlock *MBB = MI->getParent())
99 if (MachineFunction *MF = MBB->getParent()) {
100 MachineRegisterInfo &MRI = MF->getRegInfo();
101 MRI.removeRegOperandFromUseList(this);
103 MRI.addRegOperandToUseList(this);
109 /// ChangeToImmediate - Replace this operand with a new immediate operand of
110 /// the specified value. If an operand is known to be an immediate already,
111 /// the setImm method should be used.
112 void MachineOperand::ChangeToImmediate(int64_t ImmVal) {
113 assert((!isReg() || !isTied()) && "Cannot change a tied operand into an imm");
114 // If this operand is currently a register operand, and if this is in a
115 // function, deregister the operand from the register's use/def list.
116 if (isReg() && isOnRegUseList())
117 if (MachineInstr *MI = getParent())
118 if (MachineBasicBlock *MBB = MI->getParent())
119 if (MachineFunction *MF = MBB->getParent())
120 MF->getRegInfo().removeRegOperandFromUseList(this);
122 OpKind = MO_Immediate;
123 Contents.ImmVal = ImmVal;
126 /// ChangeToRegister - Replace this operand with a new register operand of
127 /// the specified value. If an operand is known to be an register already,
128 /// the setReg method should be used.
129 void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
130 bool isKill, bool isDead, bool isUndef,
132 MachineRegisterInfo *RegInfo = 0;
133 if (MachineInstr *MI = getParent())
134 if (MachineBasicBlock *MBB = MI->getParent())
135 if (MachineFunction *MF = MBB->getParent())
136 RegInfo = &MF->getRegInfo();
137 // If this operand is already a register operand, remove it from the
138 // register's use/def lists.
139 bool WasReg = isReg();
140 if (RegInfo && WasReg)
141 RegInfo->removeRegOperandFromUseList(this);
143 // Change this to a register and set the reg#.
144 OpKind = MO_Register;
145 SmallContents.RegNo = Reg;
146 SubReg_TargetFlags = 0;
152 IsInternalRead = false;
153 IsEarlyClobber = false;
155 // Ensure isOnRegUseList() returns false.
156 Contents.Reg.Prev = 0;
157 // Preserve the tie when the operand was already a register.
161 // If this operand is embedded in a function, add the operand to the
162 // register's use/def list.
164 RegInfo->addRegOperandToUseList(this);
167 /// isIdenticalTo - Return true if this operand is identical to the specified
168 /// operand. Note that this should stay in sync with the hash_value overload
170 bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
171 if (getType() != Other.getType() ||
172 getTargetFlags() != Other.getTargetFlags())
176 case MachineOperand::MO_Register:
177 return getReg() == Other.getReg() && isDef() == Other.isDef() &&
178 getSubReg() == Other.getSubReg();
179 case MachineOperand::MO_Immediate:
180 return getImm() == Other.getImm();
181 case MachineOperand::MO_CImmediate:
182 return getCImm() == Other.getCImm();
183 case MachineOperand::MO_FPImmediate:
184 return getFPImm() == Other.getFPImm();
185 case MachineOperand::MO_MachineBasicBlock:
186 return getMBB() == Other.getMBB();
187 case MachineOperand::MO_FrameIndex:
188 return getIndex() == Other.getIndex();
189 case MachineOperand::MO_ConstantPoolIndex:
190 case MachineOperand::MO_TargetIndex:
191 return getIndex() == Other.getIndex() && getOffset() == Other.getOffset();
192 case MachineOperand::MO_JumpTableIndex:
193 return getIndex() == Other.getIndex();
194 case MachineOperand::MO_GlobalAddress:
195 return getGlobal() == Other.getGlobal() && getOffset() == Other.getOffset();
196 case MachineOperand::MO_ExternalSymbol:
197 return !strcmp(getSymbolName(), Other.getSymbolName()) &&
198 getOffset() == Other.getOffset();
199 case MachineOperand::MO_BlockAddress:
200 return getBlockAddress() == Other.getBlockAddress() &&
201 getOffset() == Other.getOffset();
202 case MO_RegisterMask:
203 return getRegMask() == Other.getRegMask();
204 case MachineOperand::MO_MCSymbol:
205 return getMCSymbol() == Other.getMCSymbol();
206 case MachineOperand::MO_Metadata:
207 return getMetadata() == Other.getMetadata();
209 llvm_unreachable("Invalid machine operand type");
212 // Note: this must stay exactly in sync with isIdenticalTo above.
213 hash_code llvm::hash_value(const MachineOperand &MO) {
214 switch (MO.getType()) {
215 case MachineOperand::MO_Register:
216 // Register operands don't have target flags.
217 return hash_combine(MO.getType(), MO.getReg(), MO.getSubReg(), MO.isDef());
218 case MachineOperand::MO_Immediate:
219 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getImm());
220 case MachineOperand::MO_CImmediate:
221 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getCImm());
222 case MachineOperand::MO_FPImmediate:
223 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getFPImm());
224 case MachineOperand::MO_MachineBasicBlock:
225 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getMBB());
226 case MachineOperand::MO_FrameIndex:
227 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getIndex());
228 case MachineOperand::MO_ConstantPoolIndex:
229 case MachineOperand::MO_TargetIndex:
230 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getIndex(),
232 case MachineOperand::MO_JumpTableIndex:
233 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getIndex());
234 case MachineOperand::MO_ExternalSymbol:
235 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getOffset(),
237 case MachineOperand::MO_GlobalAddress:
238 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getGlobal(),
240 case MachineOperand::MO_BlockAddress:
241 return hash_combine(MO.getType(), MO.getTargetFlags(),
242 MO.getBlockAddress(), MO.getOffset());
243 case MachineOperand::MO_RegisterMask:
244 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getRegMask());
245 case MachineOperand::MO_Metadata:
246 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getMetadata());
247 case MachineOperand::MO_MCSymbol:
248 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getMCSymbol());
250 llvm_unreachable("Invalid machine operand type");
253 /// print - Print the specified machine operand.
255 void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
256 // If the instruction is embedded into a basic block, we can find the
257 // target info for the instruction.
259 if (const MachineInstr *MI = getParent())
260 if (const MachineBasicBlock *MBB = MI->getParent())
261 if (const MachineFunction *MF = MBB->getParent())
262 TM = &MF->getTarget();
263 const TargetRegisterInfo *TRI = TM ? TM->getRegisterInfo() : 0;
266 case MachineOperand::MO_Register:
267 OS << PrintReg(getReg(), TRI, getSubReg());
269 if (isDef() || isKill() || isDead() || isImplicit() || isUndef() ||
270 isInternalRead() || isEarlyClobber() || isTied()) {
272 bool NeedComma = false;
274 if (NeedComma) OS << ',';
275 if (isEarlyClobber())
276 OS << "earlyclobber,";
281 // <def,read-undef> only makes sense when getSubReg() is set.
282 // Don't clutter the output otherwise.
283 if (isUndef() && getSubReg())
285 } else if (isImplicit()) {
291 if (NeedComma) OS << ',';
296 if (NeedComma) OS << ',';
300 if (isUndef() && isUse()) {
301 if (NeedComma) OS << ',';
305 if (isInternalRead()) {
306 if (NeedComma) OS << ',';
311 if (NeedComma) OS << ',';
314 OS << unsigned(TiedTo - 1);
320 case MachineOperand::MO_Immediate:
323 case MachineOperand::MO_CImmediate:
324 getCImm()->getValue().print(OS, false);
326 case MachineOperand::MO_FPImmediate:
327 if (getFPImm()->getType()->isFloatTy())
328 OS << getFPImm()->getValueAPF().convertToFloat();
330 OS << getFPImm()->getValueAPF().convertToDouble();
332 case MachineOperand::MO_MachineBasicBlock:
333 OS << "<BB#" << getMBB()->getNumber() << ">";
335 case MachineOperand::MO_FrameIndex:
336 OS << "<fi#" << getIndex() << '>';
338 case MachineOperand::MO_ConstantPoolIndex:
339 OS << "<cp#" << getIndex();
340 if (getOffset()) OS << "+" << getOffset();
343 case MachineOperand::MO_TargetIndex:
344 OS << "<ti#" << getIndex();
345 if (getOffset()) OS << "+" << getOffset();
348 case MachineOperand::MO_JumpTableIndex:
349 OS << "<jt#" << getIndex() << '>';
351 case MachineOperand::MO_GlobalAddress:
353 WriteAsOperand(OS, getGlobal(), /*PrintType=*/false);
354 if (getOffset()) OS << "+" << getOffset();
357 case MachineOperand::MO_ExternalSymbol:
358 OS << "<es:" << getSymbolName();
359 if (getOffset()) OS << "+" << getOffset();
362 case MachineOperand::MO_BlockAddress:
364 WriteAsOperand(OS, getBlockAddress(), /*PrintType=*/false);
365 if (getOffset()) OS << "+" << getOffset();
368 case MachineOperand::MO_RegisterMask:
371 case MachineOperand::MO_Metadata:
373 WriteAsOperand(OS, getMetadata(), /*PrintType=*/false);
376 case MachineOperand::MO_MCSymbol:
377 OS << "<MCSym=" << *getMCSymbol() << '>';
381 if (unsigned TF = getTargetFlags())
382 OS << "[TF=" << TF << ']';
385 //===----------------------------------------------------------------------===//
386 // MachineMemOperand Implementation
387 //===----------------------------------------------------------------------===//
389 /// getAddrSpace - Return the LLVM IR address space number that this pointer
391 unsigned MachinePointerInfo::getAddrSpace() const {
392 if (V == 0) return 0;
393 return cast<PointerType>(V->getType())->getAddressSpace();
396 /// getConstantPool - Return a MachinePointerInfo record that refers to the
398 MachinePointerInfo MachinePointerInfo::getConstantPool() {
399 return MachinePointerInfo(PseudoSourceValue::getConstantPool());
402 /// getFixedStack - Return a MachinePointerInfo record that refers to the
403 /// the specified FrameIndex.
404 MachinePointerInfo MachinePointerInfo::getFixedStack(int FI, int64_t offset) {
405 return MachinePointerInfo(PseudoSourceValue::getFixedStack(FI), offset);
408 MachinePointerInfo MachinePointerInfo::getJumpTable() {
409 return MachinePointerInfo(PseudoSourceValue::getJumpTable());
412 MachinePointerInfo MachinePointerInfo::getGOT() {
413 return MachinePointerInfo(PseudoSourceValue::getGOT());
416 MachinePointerInfo MachinePointerInfo::getStack(int64_t Offset) {
417 return MachinePointerInfo(PseudoSourceValue::getStack(), Offset);
420 MachineMemOperand::MachineMemOperand(MachinePointerInfo ptrinfo, unsigned f,
421 uint64_t s, unsigned int a,
422 const MDNode *TBAAInfo,
423 const MDNode *Ranges)
424 : PtrInfo(ptrinfo), Size(s),
425 Flags((f & ((1 << MOMaxBits) - 1)) | ((Log2_32(a) + 1) << MOMaxBits)),
426 TBAAInfo(TBAAInfo), Ranges(Ranges) {
427 assert((PtrInfo.V == 0 || isa<PointerType>(PtrInfo.V->getType())) &&
428 "invalid pointer value");
429 assert(getBaseAlignment() == a && "Alignment is not a power of 2!");
430 assert((isLoad() || isStore()) && "Not a load/store!");
433 /// Profile - Gather unique data for the object.
435 void MachineMemOperand::Profile(FoldingSetNodeID &ID) const {
436 ID.AddInteger(getOffset());
438 ID.AddPointer(getValue());
439 ID.AddInteger(Flags);
442 void MachineMemOperand::refineAlignment(const MachineMemOperand *MMO) {
443 // The Value and Offset may differ due to CSE. But the flags and size
444 // should be the same.
445 assert(MMO->getFlags() == getFlags() && "Flags mismatch!");
446 assert(MMO->getSize() == getSize() && "Size mismatch!");
448 if (MMO->getBaseAlignment() >= getBaseAlignment()) {
449 // Update the alignment value.
450 Flags = (Flags & ((1 << MOMaxBits) - 1)) |
451 ((Log2_32(MMO->getBaseAlignment()) + 1) << MOMaxBits);
452 // Also update the base and offset, because the new alignment may
453 // not be applicable with the old ones.
454 PtrInfo = MMO->PtrInfo;
458 /// getAlignment - Return the minimum known alignment in bytes of the
459 /// actual memory reference.
460 uint64_t MachineMemOperand::getAlignment() const {
461 return MinAlign(getBaseAlignment(), getOffset());
464 raw_ostream &llvm::operator<<(raw_ostream &OS, const MachineMemOperand &MMO) {
465 assert((MMO.isLoad() || MMO.isStore()) &&
466 "SV has to be a load, store or both.");
468 if (MMO.isVolatile())
477 // Print the address information.
482 WriteAsOperand(OS, MMO.getValue(), /*PrintType=*/false);
484 // If the alignment of the memory reference itself differs from the alignment
485 // of the base pointer, print the base alignment explicitly, next to the base
487 if (MMO.getBaseAlignment() != MMO.getAlignment())
488 OS << "(align=" << MMO.getBaseAlignment() << ")";
490 if (MMO.getOffset() != 0)
491 OS << "+" << MMO.getOffset();
494 // Print the alignment of the reference.
495 if (MMO.getBaseAlignment() != MMO.getAlignment() ||
496 MMO.getBaseAlignment() != MMO.getSize())
497 OS << "(align=" << MMO.getAlignment() << ")";
500 if (const MDNode *TBAAInfo = MMO.getTBAAInfo()) {
502 if (TBAAInfo->getNumOperands() > 0)
503 WriteAsOperand(OS, TBAAInfo->getOperand(0), /*PrintType=*/false);
509 // Print nontemporal info.
510 if (MMO.isNonTemporal())
511 OS << "(nontemporal)";
516 //===----------------------------------------------------------------------===//
517 // MachineInstr Implementation
518 //===----------------------------------------------------------------------===//
520 void MachineInstr::addImplicitDefUseOperands(MachineFunction &MF) {
521 if (MCID->ImplicitDefs)
522 for (const uint16_t *ImpDefs = MCID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
523 addOperand(MF, MachineOperand::CreateReg(*ImpDefs, true, true));
524 if (MCID->ImplicitUses)
525 for (const uint16_t *ImpUses = MCID->getImplicitUses(); *ImpUses; ++ImpUses)
526 addOperand(MF, MachineOperand::CreateReg(*ImpUses, false, true));
529 /// MachineInstr ctor - This constructor creates a MachineInstr and adds the
530 /// implicit operands. It reserves space for the number of operands specified by
532 MachineInstr::MachineInstr(MachineFunction &MF, const MCInstrDesc &tid,
533 const DebugLoc dl, bool NoImp)
534 : MCID(&tid), Parent(0), Operands(0), NumOperands(0),
535 Flags(0), AsmPrinterFlags(0),
536 NumMemRefs(0), MemRefs(0), debugLoc(dl) {
537 // Reserve space for the expected number of operands.
538 if (unsigned NumOps = MCID->getNumOperands() +
539 MCID->getNumImplicitDefs() + MCID->getNumImplicitUses()) {
540 CapOperands = OperandCapacity::get(NumOps);
541 Operands = MF.allocateOperandArray(CapOperands);
545 addImplicitDefUseOperands(MF);
548 /// MachineInstr ctor - Copies MachineInstr arg exactly
550 MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI)
551 : MCID(&MI.getDesc()), Parent(0), Operands(0), NumOperands(0),
552 Flags(0), AsmPrinterFlags(0),
553 NumMemRefs(MI.NumMemRefs), MemRefs(MI.MemRefs),
554 debugLoc(MI.getDebugLoc()) {
555 CapOperands = OperandCapacity::get(MI.getNumOperands());
556 Operands = MF.allocateOperandArray(CapOperands);
559 for (unsigned i = 0; i != MI.getNumOperands(); ++i)
560 addOperand(MF, MI.getOperand(i));
562 // Copy all the sensible flags.
566 /// getRegInfo - If this instruction is embedded into a MachineFunction,
567 /// return the MachineRegisterInfo object for the current function, otherwise
569 MachineRegisterInfo *MachineInstr::getRegInfo() {
570 if (MachineBasicBlock *MBB = getParent())
571 return &MBB->getParent()->getRegInfo();
575 /// RemoveRegOperandsFromUseLists - Unlink all of the register operands in
576 /// this instruction from their respective use lists. This requires that the
577 /// operands already be on their use lists.
578 void MachineInstr::RemoveRegOperandsFromUseLists(MachineRegisterInfo &MRI) {
579 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
580 if (Operands[i].isReg())
581 MRI.removeRegOperandFromUseList(&Operands[i]);
584 /// AddRegOperandsToUseLists - Add all of the register operands in
585 /// this instruction from their respective use lists. This requires that the
586 /// operands not be on their use lists yet.
587 void MachineInstr::AddRegOperandsToUseLists(MachineRegisterInfo &MRI) {
588 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
589 if (Operands[i].isReg())
590 MRI.addRegOperandToUseList(&Operands[i]);
593 void MachineInstr::addOperand(const MachineOperand &Op) {
594 MachineBasicBlock *MBB = getParent();
595 assert(MBB && "Use MachineInstrBuilder to add operands to dangling instrs");
596 MachineFunction *MF = MBB->getParent();
597 assert(MF && "Use MachineInstrBuilder to add operands to dangling instrs");
601 /// Move NumOps MachineOperands from Src to Dst, with support for overlapping
602 /// ranges. If MRI is non-null also update use-def chains.
603 static void moveOperands(MachineOperand *Dst, MachineOperand *Src,
604 unsigned NumOps, MachineRegisterInfo *MRI) {
606 return MRI->moveOperands(Dst, Src, NumOps);
608 // Here it would be convenient to call memmove, so that isn't allowed because
609 // MachineOperand has a constructor and so isn't a POD type.
611 for (unsigned i = 0; i != NumOps; ++i)
612 new (Dst + i) MachineOperand(Src[i]);
614 for (unsigned i = NumOps; i ; --i)
615 new (Dst + i - 1) MachineOperand(Src[i - 1]);
618 /// addOperand - Add the specified operand to the instruction. If it is an
619 /// implicit operand, it is added to the end of the operand list. If it is
620 /// an explicit operand it is added at the end of the explicit operand list
621 /// (before the first implicit operand).
622 void MachineInstr::addOperand(MachineFunction &MF, const MachineOperand &Op) {
623 assert(MCID && "Cannot add operands before providing an instr descriptor");
625 // Check if we're adding one of our existing operands.
626 if (&Op >= Operands && &Op < Operands + NumOperands) {
627 // This is unusual: MI->addOperand(MI->getOperand(i)).
628 // If adding Op requires reallocating or moving existing operands around,
629 // the Op reference could go stale. Support it by copying Op.
630 MachineOperand CopyOp(Op);
631 return addOperand(MF, CopyOp);
634 // Find the insert location for the new operand. Implicit registers go at
635 // the end, everything else goes before the implicit regs.
637 // FIXME: Allow mixed explicit and implicit operands on inline asm.
638 // InstrEmitter::EmitSpecialNode() is marking inline asm clobbers as
639 // implicit-defs, but they must not be moved around. See the FIXME in
641 unsigned OpNo = getNumOperands();
642 bool isImpReg = Op.isReg() && Op.isImplicit();
643 if (!isImpReg && !isInlineAsm()) {
644 while (OpNo && Operands[OpNo-1].isReg() && Operands[OpNo-1].isImplicit()) {
646 assert(!Operands[OpNo].isTied() && "Cannot move tied operands");
650 // OpNo now points as the desired insertion point. Unless this is a variadic
651 // instruction, only implicit regs are allowed beyond MCID->getNumOperands().
652 // RegMask operands go between the explicit and implicit operands.
653 assert((isImpReg || Op.isRegMask() || MCID->isVariadic() ||
654 OpNo < MCID->getNumOperands()) &&
655 "Trying to add an operand to a machine instr that is already done!");
657 MachineRegisterInfo *MRI = getRegInfo();
659 // Determine if the Operands array needs to be reallocated.
660 // Save the old capacity and operand array.
661 OperandCapacity OldCap = CapOperands;
662 MachineOperand *OldOperands = Operands;
663 if (!OldOperands || OldCap.getSize() == getNumOperands()) {
664 CapOperands = OldOperands ? OldCap.getNext() : OldCap.get(1);
665 Operands = MF.allocateOperandArray(CapOperands);
666 // Move the operands before the insertion point.
668 moveOperands(Operands, OldOperands, OpNo, MRI);
671 // Move the operands following the insertion point.
672 if (OpNo != NumOperands)
673 moveOperands(Operands + OpNo + 1, OldOperands + OpNo, NumOperands - OpNo,
677 // Deallocate the old operand array.
678 if (OldOperands != Operands && OldOperands)
679 MF.deallocateOperandArray(OldCap, OldOperands);
681 // Copy Op into place. It still needs to be inserted into the MRI use lists.
682 MachineOperand *NewMO = new (Operands + OpNo) MachineOperand(Op);
683 NewMO->ParentMI = this;
685 // When adding a register operand, tell MRI about it.
686 if (NewMO->isReg()) {
687 // Ensure isOnRegUseList() returns false, regardless of Op's status.
688 NewMO->Contents.Reg.Prev = 0;
689 // Ignore existing ties. This is not a property that can be copied.
691 // Add the new operand to MRI, but only for instructions in an MBB.
693 MRI->addRegOperandToUseList(NewMO);
694 // The MCID operand information isn't accurate until we start adding
695 // explicit operands. The implicit operands are added first, then the
696 // explicits are inserted before them.
698 // Tie uses to defs as indicated in MCInstrDesc.
699 if (NewMO->isUse()) {
700 int DefIdx = MCID->getOperandConstraint(OpNo, MCOI::TIED_TO);
702 tieOperands(DefIdx, OpNo);
704 // If the register operand is flagged as early, mark the operand as such.
705 if (MCID->getOperandConstraint(OpNo, MCOI::EARLY_CLOBBER) != -1)
706 NewMO->setIsEarlyClobber(true);
711 /// RemoveOperand - Erase an operand from an instruction, leaving it with one
712 /// fewer operand than it started with.
714 void MachineInstr::RemoveOperand(unsigned OpNo) {
715 assert(OpNo < getNumOperands() && "Invalid operand number");
716 untieRegOperand(OpNo);
719 // Moving tied operands would break the ties.
720 for (unsigned i = OpNo + 1, e = getNumOperands(); i != e; ++i)
721 if (Operands[i].isReg())
722 assert(!Operands[i].isTied() && "Cannot move tied operands");
725 MachineRegisterInfo *MRI = getRegInfo();
726 if (MRI && Operands[OpNo].isReg())
727 MRI->removeRegOperandFromUseList(Operands + OpNo);
729 // Don't call the MachineOperand destructor. A lot of this code depends on
730 // MachineOperand having a trivial destructor anyway, and adding a call here
731 // wouldn't make it 'destructor-correct'.
733 if (unsigned N = NumOperands - 1 - OpNo)
734 moveOperands(Operands + OpNo, Operands + OpNo + 1, N, MRI);
738 /// addMemOperand - Add a MachineMemOperand to the machine instruction.
739 /// This function should be used only occasionally. The setMemRefs function
740 /// is the primary method for setting up a MachineInstr's MemRefs list.
741 void MachineInstr::addMemOperand(MachineFunction &MF,
742 MachineMemOperand *MO) {
743 mmo_iterator OldMemRefs = MemRefs;
744 unsigned OldNumMemRefs = NumMemRefs;
746 unsigned NewNum = NumMemRefs + 1;
747 mmo_iterator NewMemRefs = MF.allocateMemRefsArray(NewNum);
749 std::copy(OldMemRefs, OldMemRefs + OldNumMemRefs, NewMemRefs);
750 NewMemRefs[NewNum - 1] = MO;
751 setMemRefs(NewMemRefs, NewMemRefs + NewNum);
754 bool MachineInstr::hasPropertyInBundle(unsigned Mask, QueryType Type) const {
755 assert(!isBundledWithPred() && "Must be called on bundle header");
756 for (MachineBasicBlock::const_instr_iterator MII = this;; ++MII) {
757 if (MII->getDesc().getFlags() & Mask) {
758 if (Type == AnyInBundle)
761 if (Type == AllInBundle && !MII->isBundle())
764 // This was the last instruction in the bundle.
765 if (!MII->isBundledWithSucc())
766 return Type == AllInBundle;
770 bool MachineInstr::isIdenticalTo(const MachineInstr *Other,
771 MICheckType Check) const {
772 // If opcodes or number of operands are not the same then the two
773 // instructions are obviously not identical.
774 if (Other->getOpcode() != getOpcode() ||
775 Other->getNumOperands() != getNumOperands())
779 // Both instructions are bundles, compare MIs inside the bundle.
780 MachineBasicBlock::const_instr_iterator I1 = *this;
781 MachineBasicBlock::const_instr_iterator E1 = getParent()->instr_end();
782 MachineBasicBlock::const_instr_iterator I2 = *Other;
783 MachineBasicBlock::const_instr_iterator E2= Other->getParent()->instr_end();
784 while (++I1 != E1 && I1->isInsideBundle()) {
786 if (I2 == E2 || !I2->isInsideBundle() || !I1->isIdenticalTo(I2, Check))
791 // Check operands to make sure they match.
792 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
793 const MachineOperand &MO = getOperand(i);
794 const MachineOperand &OMO = Other->getOperand(i);
796 if (!MO.isIdenticalTo(OMO))
801 // Clients may or may not want to ignore defs when testing for equality.
802 // For example, machine CSE pass only cares about finding common
803 // subexpressions, so it's safe to ignore virtual register defs.
805 if (Check == IgnoreDefs)
807 else if (Check == IgnoreVRegDefs) {
808 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) ||
809 TargetRegisterInfo::isPhysicalRegister(OMO.getReg()))
810 if (MO.getReg() != OMO.getReg())
813 if (!MO.isIdenticalTo(OMO))
815 if (Check == CheckKillDead && MO.isDead() != OMO.isDead())
819 if (!MO.isIdenticalTo(OMO))
821 if (Check == CheckKillDead && MO.isKill() != OMO.isKill())
825 // If DebugLoc does not match then two dbg.values are not identical.
827 if (!getDebugLoc().isUnknown() && !Other->getDebugLoc().isUnknown()
828 && getDebugLoc() != Other->getDebugLoc())
833 MachineInstr *MachineInstr::removeFromParent() {
834 assert(getParent() && "Not embedded in a basic block!");
835 return getParent()->remove(this);
838 MachineInstr *MachineInstr::removeFromBundle() {
839 assert(getParent() && "Not embedded in a basic block!");
840 return getParent()->remove_instr(this);
843 void MachineInstr::eraseFromParent() {
844 assert(getParent() && "Not embedded in a basic block!");
845 getParent()->erase(this);
848 void MachineInstr::eraseFromBundle() {
849 assert(getParent() && "Not embedded in a basic block!");
850 getParent()->erase_instr(this);
853 /// getNumExplicitOperands - Returns the number of non-implicit operands.
855 unsigned MachineInstr::getNumExplicitOperands() const {
856 unsigned NumOperands = MCID->getNumOperands();
857 if (!MCID->isVariadic())
860 for (unsigned i = NumOperands, e = getNumOperands(); i != e; ++i) {
861 const MachineOperand &MO = getOperand(i);
862 if (!MO.isReg() || !MO.isImplicit())
868 void MachineInstr::bundleWithPred() {
869 assert(!isBundledWithPred() && "MI is already bundled with its predecessor");
870 setFlag(BundledPred);
871 MachineBasicBlock::instr_iterator Pred = this;
873 assert(!Pred->isBundledWithSucc() && "Inconsistent bundle flags");
874 Pred->setFlag(BundledSucc);
877 void MachineInstr::bundleWithSucc() {
878 assert(!isBundledWithSucc() && "MI is already bundled with its successor");
879 setFlag(BundledSucc);
880 MachineBasicBlock::instr_iterator Succ = this;
882 assert(!Succ->isBundledWithPred() && "Inconsistent bundle flags");
883 Succ->setFlag(BundledPred);
886 void MachineInstr::unbundleFromPred() {
887 assert(isBundledWithPred() && "MI isn't bundled with its predecessor");
888 clearFlag(BundledPred);
889 MachineBasicBlock::instr_iterator Pred = this;
891 assert(Pred->isBundledWithSucc() && "Inconsistent bundle flags");
892 Pred->clearFlag(BundledSucc);
895 void MachineInstr::unbundleFromSucc() {
896 assert(isBundledWithSucc() && "MI isn't bundled with its successor");
897 clearFlag(BundledSucc);
898 MachineBasicBlock::instr_iterator Succ = this;
900 assert(Succ->isBundledWithPred() && "Inconsistent bundle flags");
901 Succ->clearFlag(BundledPred);
904 bool MachineInstr::isStackAligningInlineAsm() const {
906 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
907 if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
913 InlineAsm::AsmDialect MachineInstr::getInlineAsmDialect() const {
914 assert(isInlineAsm() && "getInlineAsmDialect() only works for inline asms!");
915 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
916 return InlineAsm::AsmDialect((ExtraInfo & InlineAsm::Extra_AsmDialect) != 0);
919 int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx,
920 unsigned *GroupNo) const {
921 assert(isInlineAsm() && "Expected an inline asm instruction");
922 assert(OpIdx < getNumOperands() && "OpIdx out of range");
924 // Ignore queries about the initial operands.
925 if (OpIdx < InlineAsm::MIOp_FirstOperand)
930 for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
932 const MachineOperand &FlagMO = getOperand(i);
933 // If we reach the implicit register operands, stop looking.
936 NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
937 if (i + NumOps > OpIdx) {
947 const TargetRegisterClass*
948 MachineInstr::getRegClassConstraint(unsigned OpIdx,
949 const TargetInstrInfo *TII,
950 const TargetRegisterInfo *TRI) const {
951 assert(getParent() && "Can't have an MBB reference here!");
952 assert(getParent()->getParent() && "Can't have an MF reference here!");
953 const MachineFunction &MF = *getParent()->getParent();
955 // Most opcodes have fixed constraints in their MCInstrDesc.
957 return TII->getRegClass(getDesc(), OpIdx, TRI, MF);
959 if (!getOperand(OpIdx).isReg())
962 // For tied uses on inline asm, get the constraint from the def.
964 if (getOperand(OpIdx).isUse() && isRegTiedToDefOperand(OpIdx, &DefIdx))
967 // Inline asm stores register class constraints in the flag word.
968 int FlagIdx = findInlineAsmFlagIdx(OpIdx);
972 unsigned Flag = getOperand(FlagIdx).getImm();
974 if (InlineAsm::hasRegClassConstraint(Flag, RCID))
975 return TRI->getRegClass(RCID);
977 // Assume that all registers in a memory operand are pointers.
978 if (InlineAsm::getKind(Flag) == InlineAsm::Kind_Mem)
979 return TRI->getPointerRegClass(MF);
984 /// Return the number of instructions inside the MI bundle, not counting the
985 /// header instruction.
986 unsigned MachineInstr::getBundleSize() const {
987 MachineBasicBlock::const_instr_iterator I = this;
989 while (I->isBundledWithSucc())
994 /// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of
995 /// the specific register or -1 if it is not found. It further tightens
996 /// the search criteria to a use that kills the register if isKill is true.
997 int MachineInstr::findRegisterUseOperandIdx(unsigned Reg, bool isKill,
998 const TargetRegisterInfo *TRI) const {
999 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1000 const MachineOperand &MO = getOperand(i);
1001 if (!MO.isReg() || !MO.isUse())
1003 unsigned MOReg = MO.getReg();
1008 TargetRegisterInfo::isPhysicalRegister(MOReg) &&
1009 TargetRegisterInfo::isPhysicalRegister(Reg) &&
1010 TRI->isSubRegister(MOReg, Reg)))
1011 if (!isKill || MO.isKill())
1017 /// readsWritesVirtualRegister - Return a pair of bools (reads, writes)
1018 /// indicating if this instruction reads or writes Reg. This also considers
1019 /// partial defines.
1020 std::pair<bool,bool>
1021 MachineInstr::readsWritesVirtualRegister(unsigned Reg,
1022 SmallVectorImpl<unsigned> *Ops) const {
1023 bool PartDef = false; // Partial redefine.
1024 bool FullDef = false; // Full define.
1027 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1028 const MachineOperand &MO = getOperand(i);
1029 if (!MO.isReg() || MO.getReg() != Reg)
1034 Use |= !MO.isUndef();
1035 else if (MO.getSubReg() && !MO.isUndef())
1036 // A partial <def,undef> doesn't count as reading the register.
1041 // A partial redefine uses Reg unless there is also a full define.
1042 return std::make_pair(Use || (PartDef && !FullDef), PartDef || FullDef);
1045 /// findRegisterDefOperandIdx() - Returns the operand index that is a def of
1046 /// the specified register or -1 if it is not found. If isDead is true, defs
1047 /// that are not dead are skipped. If TargetRegisterInfo is non-null, then it
1048 /// also checks if there is a def of a super-register.
1050 MachineInstr::findRegisterDefOperandIdx(unsigned Reg, bool isDead, bool Overlap,
1051 const TargetRegisterInfo *TRI) const {
1052 bool isPhys = TargetRegisterInfo::isPhysicalRegister(Reg);
1053 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1054 const MachineOperand &MO = getOperand(i);
1055 // Accept regmask operands when Overlap is set.
1056 // Ignore them when looking for a specific def operand (Overlap == false).
1057 if (isPhys && Overlap && MO.isRegMask() && MO.clobbersPhysReg(Reg))
1059 if (!MO.isReg() || !MO.isDef())
1061 unsigned MOReg = MO.getReg();
1062 bool Found = (MOReg == Reg);
1063 if (!Found && TRI && isPhys &&
1064 TargetRegisterInfo::isPhysicalRegister(MOReg)) {
1066 Found = TRI->regsOverlap(MOReg, Reg);
1068 Found = TRI->isSubRegister(MOReg, Reg);
1070 if (Found && (!isDead || MO.isDead()))
1076 /// findFirstPredOperandIdx() - Find the index of the first operand in the
1077 /// operand list that is used to represent the predicate. It returns -1 if
1079 int MachineInstr::findFirstPredOperandIdx() const {
1080 // Don't call MCID.findFirstPredOperandIdx() because this variant
1081 // is sometimes called on an instruction that's not yet complete, and
1082 // so the number of operands is less than the MCID indicates. In
1083 // particular, the PTX target does this.
1084 const MCInstrDesc &MCID = getDesc();
1085 if (MCID.isPredicable()) {
1086 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1087 if (MCID.OpInfo[i].isPredicate())
1094 // MachineOperand::TiedTo is 4 bits wide.
1095 const unsigned TiedMax = 15;
1097 /// tieOperands - Mark operands at DefIdx and UseIdx as tied to each other.
1099 /// Use and def operands can be tied together, indicated by a non-zero TiedTo
1100 /// field. TiedTo can have these values:
1102 /// 0: Operand is not tied to anything.
1103 /// 1 to TiedMax-1: Tied to getOperand(TiedTo-1).
1104 /// TiedMax: Tied to an operand >= TiedMax-1.
1106 /// The tied def must be one of the first TiedMax operands on a normal
1107 /// instruction. INLINEASM instructions allow more tied defs.
1109 void MachineInstr::tieOperands(unsigned DefIdx, unsigned UseIdx) {
1110 MachineOperand &DefMO = getOperand(DefIdx);
1111 MachineOperand &UseMO = getOperand(UseIdx);
1112 assert(DefMO.isDef() && "DefIdx must be a def operand");
1113 assert(UseMO.isUse() && "UseIdx must be a use operand");
1114 assert(!DefMO.isTied() && "Def is already tied to another use");
1115 assert(!UseMO.isTied() && "Use is already tied to another def");
1117 if (DefIdx < TiedMax)
1118 UseMO.TiedTo = DefIdx + 1;
1120 // Inline asm can use the group descriptors to find tied operands, but on
1121 // normal instruction, the tied def must be within the first TiedMax
1123 assert(isInlineAsm() && "DefIdx out of range");
1124 UseMO.TiedTo = TiedMax;
1127 // UseIdx can be out of range, we'll search for it in findTiedOperandIdx().
1128 DefMO.TiedTo = std::min(UseIdx + 1, TiedMax);
1131 /// Given the index of a tied register operand, find the operand it is tied to.
1132 /// Defs are tied to uses and vice versa. Returns the index of the tied operand
1133 /// which must exist.
1134 unsigned MachineInstr::findTiedOperandIdx(unsigned OpIdx) const {
1135 const MachineOperand &MO = getOperand(OpIdx);
1136 assert(MO.isTied() && "Operand isn't tied");
1138 // Normally TiedTo is in range.
1139 if (MO.TiedTo < TiedMax)
1140 return MO.TiedTo - 1;
1142 // Uses on normal instructions can be out of range.
1143 if (!isInlineAsm()) {
1144 // Normal tied defs must be in the 0..TiedMax-1 range.
1147 // MO is a def. Search for the tied use.
1148 for (unsigned i = TiedMax - 1, e = getNumOperands(); i != e; ++i) {
1149 const MachineOperand &UseMO = getOperand(i);
1150 if (UseMO.isReg() && UseMO.isUse() && UseMO.TiedTo == OpIdx + 1)
1153 llvm_unreachable("Can't find tied use");
1156 // Now deal with inline asm by parsing the operand group descriptor flags.
1157 // Find the beginning of each operand group.
1158 SmallVector<unsigned, 8> GroupIdx;
1159 unsigned OpIdxGroup = ~0u;
1161 for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
1163 const MachineOperand &FlagMO = getOperand(i);
1164 assert(FlagMO.isImm() && "Invalid tied operand on inline asm");
1165 unsigned CurGroup = GroupIdx.size();
1166 GroupIdx.push_back(i);
1167 NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
1168 // OpIdx belongs to this operand group.
1169 if (OpIdx > i && OpIdx < i + NumOps)
1170 OpIdxGroup = CurGroup;
1172 if (!InlineAsm::isUseOperandTiedToDef(FlagMO.getImm(), TiedGroup))
1174 // Operands in this group are tied to operands in TiedGroup which must be
1175 // earlier. Find the number of operands between the two groups.
1176 unsigned Delta = i - GroupIdx[TiedGroup];
1178 // OpIdx is a use tied to TiedGroup.
1179 if (OpIdxGroup == CurGroup)
1180 return OpIdx - Delta;
1182 // OpIdx is a def tied to this use group.
1183 if (OpIdxGroup == TiedGroup)
1184 return OpIdx + Delta;
1186 llvm_unreachable("Invalid tied operand on inline asm");
1189 /// clearKillInfo - Clears kill flags on all operands.
1191 void MachineInstr::clearKillInfo() {
1192 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1193 MachineOperand &MO = getOperand(i);
1194 if (MO.isReg() && MO.isUse())
1195 MO.setIsKill(false);
1199 void MachineInstr::substituteRegister(unsigned FromReg,
1202 const TargetRegisterInfo &RegInfo) {
1203 if (TargetRegisterInfo::isPhysicalRegister(ToReg)) {
1205 ToReg = RegInfo.getSubReg(ToReg, SubIdx);
1206 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1207 MachineOperand &MO = getOperand(i);
1208 if (!MO.isReg() || MO.getReg() != FromReg)
1210 MO.substPhysReg(ToReg, RegInfo);
1213 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1214 MachineOperand &MO = getOperand(i);
1215 if (!MO.isReg() || MO.getReg() != FromReg)
1217 MO.substVirtReg(ToReg, SubIdx, RegInfo);
1222 /// isSafeToMove - Return true if it is safe to move this instruction. If
1223 /// SawStore is set to true, it means that there is a store (or call) between
1224 /// the instruction's location and its intended destination.
1225 bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII,
1227 bool &SawStore) const {
1228 // Ignore stuff that we obviously can't move.
1230 // Treat volatile loads as stores. This is not strictly necessary for
1231 // volatiles, but it is required for atomic loads. It is not allowed to move
1232 // a load across an atomic load with Ordering > Monotonic.
1233 if (mayStore() || isCall() ||
1234 (mayLoad() && hasOrderedMemoryRef())) {
1239 if (isLabel() || isDebugValue() ||
1240 isTerminator() || hasUnmodeledSideEffects())
1243 // See if this instruction does a load. If so, we have to guarantee that the
1244 // loaded value doesn't change between the load and the its intended
1245 // destination. The check for isInvariantLoad gives the targe the chance to
1246 // classify the load as always returning a constant, e.g. a constant pool
1248 if (mayLoad() && !isInvariantLoad(AA))
1249 // Otherwise, this is a real load. If there is a store between the load and
1250 // end of block, we can't move it.
1256 /// isSafeToReMat - Return true if it's safe to rematerialize the specified
1257 /// instruction which defined the specified register instead of copying it.
1258 bool MachineInstr::isSafeToReMat(const TargetInstrInfo *TII,
1260 unsigned DstReg) const {
1261 bool SawStore = false;
1262 if (!TII->isTriviallyReMaterializable(this, AA) ||
1263 !isSafeToMove(TII, AA, SawStore))
1265 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1266 const MachineOperand &MO = getOperand(i);
1269 // FIXME: For now, do not remat any instruction with register operands.
1270 // Later on, we can loosen the restriction is the register operands have
1271 // not been modified between the def and use. Note, this is different from
1272 // MachineSink because the code is no longer in two-address form (at least
1276 else if (!MO.isDead() && MO.getReg() != DstReg)
1282 /// hasOrderedMemoryRef - Return true if this instruction may have an ordered
1283 /// or volatile memory reference, or if the information describing the memory
1284 /// reference is not available. Return false if it is known to have no ordered
1285 /// memory references.
1286 bool MachineInstr::hasOrderedMemoryRef() const {
1287 // An instruction known never to access memory won't have a volatile access.
1291 !hasUnmodeledSideEffects())
1294 // Otherwise, if the instruction has no memory reference information,
1295 // conservatively assume it wasn't preserved.
1296 if (memoperands_empty())
1299 // Check the memory reference information for ordered references.
1300 for (mmo_iterator I = memoperands_begin(), E = memoperands_end(); I != E; ++I)
1301 if (!(*I)->isUnordered())
1307 /// isInvariantLoad - Return true if this instruction is loading from a
1308 /// location whose value is invariant across the function. For example,
1309 /// loading a value from the constant pool or from the argument area
1310 /// of a function if it does not change. This should only return true of
1311 /// *all* loads the instruction does are invariant (if it does multiple loads).
1312 bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const {
1313 // If the instruction doesn't load at all, it isn't an invariant load.
1317 // If the instruction has lost its memoperands, conservatively assume that
1318 // it may not be an invariant load.
1319 if (memoperands_empty())
1322 const MachineFrameInfo *MFI = getParent()->getParent()->getFrameInfo();
1324 for (mmo_iterator I = memoperands_begin(),
1325 E = memoperands_end(); I != E; ++I) {
1326 if ((*I)->isVolatile()) return false;
1327 if ((*I)->isStore()) return false;
1328 if ((*I)->isInvariant()) return true;
1330 if (const Value *V = (*I)->getValue()) {
1331 // A load from a constant PseudoSourceValue is invariant.
1332 if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V))
1333 if (PSV->isConstant(MFI))
1335 // If we have an AliasAnalysis, ask it whether the memory is constant.
1336 if (AA && AA->pointsToConstantMemory(
1337 AliasAnalysis::Location(V, (*I)->getSize(),
1338 (*I)->getTBAAInfo())))
1342 // Otherwise assume conservatively.
1346 // Everything checks out.
1350 /// isConstantValuePHI - If the specified instruction is a PHI that always
1351 /// merges together the same virtual register, return the register, otherwise
1353 unsigned MachineInstr::isConstantValuePHI() const {
1356 assert(getNumOperands() >= 3 &&
1357 "It's illegal to have a PHI without source operands");
1359 unsigned Reg = getOperand(1).getReg();
1360 for (unsigned i = 3, e = getNumOperands(); i < e; i += 2)
1361 if (getOperand(i).getReg() != Reg)
1366 bool MachineInstr::hasUnmodeledSideEffects() const {
1367 if (hasProperty(MCID::UnmodeledSideEffects))
1369 if (isInlineAsm()) {
1370 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
1371 if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
1378 /// allDefsAreDead - Return true if all the defs of this instruction are dead.
1380 bool MachineInstr::allDefsAreDead() const {
1381 for (unsigned i = 0, e = getNumOperands(); i < e; ++i) {
1382 const MachineOperand &MO = getOperand(i);
1383 if (!MO.isReg() || MO.isUse())
1391 /// copyImplicitOps - Copy implicit register operands from specified
1392 /// instruction to this instruction.
1393 void MachineInstr::copyImplicitOps(MachineFunction &MF,
1394 const MachineInstr *MI) {
1395 for (unsigned i = MI->getDesc().getNumOperands(), e = MI->getNumOperands();
1397 const MachineOperand &MO = MI->getOperand(i);
1398 if (MO.isReg() && MO.isImplicit())
1403 void MachineInstr::dump() const {
1404 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
1405 dbgs() << " " << *this;
1409 static void printDebugLoc(DebugLoc DL, const MachineFunction *MF,
1410 raw_ostream &CommentOS) {
1411 const LLVMContext &Ctx = MF->getFunction()->getContext();
1412 if (!DL.isUnknown()) { // Print source line info.
1413 DIScope Scope(DL.getScope(Ctx));
1414 // Omit the directory, because it's likely to be long and uninteresting.
1416 CommentOS << Scope.getFilename();
1418 CommentOS << "<unknown>";
1419 CommentOS << ':' << DL.getLine();
1420 if (DL.getCol() != 0)
1421 CommentOS << ':' << DL.getCol();
1422 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(DL.getInlinedAt(Ctx));
1423 if (!InlinedAtDL.isUnknown()) {
1424 CommentOS << " @[ ";
1425 printDebugLoc(InlinedAtDL, MF, CommentOS);
1431 void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
1432 // We can be a bit tidier if we know the TargetMachine and/or MachineFunction.
1433 const MachineFunction *MF = 0;
1434 const MachineRegisterInfo *MRI = 0;
1435 if (const MachineBasicBlock *MBB = getParent()) {
1436 MF = MBB->getParent();
1438 TM = &MF->getTarget();
1440 MRI = &MF->getRegInfo();
1443 // Save a list of virtual registers.
1444 SmallVector<unsigned, 8> VirtRegs;
1446 // Print explicitly defined operands on the left of an assignment syntax.
1447 unsigned StartOp = 0, e = getNumOperands();
1448 for (; StartOp < e && getOperand(StartOp).isReg() &&
1449 getOperand(StartOp).isDef() &&
1450 !getOperand(StartOp).isImplicit();
1452 if (StartOp != 0) OS << ", ";
1453 getOperand(StartOp).print(OS, TM);
1454 unsigned Reg = getOperand(StartOp).getReg();
1455 if (TargetRegisterInfo::isVirtualRegister(Reg))
1456 VirtRegs.push_back(Reg);
1462 // Print the opcode name.
1463 if (TM && TM->getInstrInfo())
1464 OS << TM->getInstrInfo()->getName(getOpcode());
1468 // Print the rest of the operands.
1469 bool OmittedAnyCallClobbers = false;
1470 bool FirstOp = true;
1471 unsigned AsmDescOp = ~0u;
1472 unsigned AsmOpCount = 0;
1474 if (isInlineAsm() && e >= InlineAsm::MIOp_FirstOperand) {
1475 // Print asm string.
1477 getOperand(InlineAsm::MIOp_AsmString).print(OS, TM);
1479 // Print HasSideEffects, MayLoad, MayStore, IsAlignStack
1480 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
1481 if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
1482 OS << " [sideeffect]";
1483 if (ExtraInfo & InlineAsm::Extra_MayLoad)
1485 if (ExtraInfo & InlineAsm::Extra_MayStore)
1486 OS << " [maystore]";
1487 if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
1488 OS << " [alignstack]";
1489 if (getInlineAsmDialect() == InlineAsm::AD_ATT)
1490 OS << " [attdialect]";
1491 if (getInlineAsmDialect() == InlineAsm::AD_Intel)
1492 OS << " [inteldialect]";
1494 StartOp = AsmDescOp = InlineAsm::MIOp_FirstOperand;
1499 for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
1500 const MachineOperand &MO = getOperand(i);
1502 if (MO.isReg() && TargetRegisterInfo::isVirtualRegister(MO.getReg()))
1503 VirtRegs.push_back(MO.getReg());
1505 // Omit call-clobbered registers which aren't used anywhere. This makes
1506 // call instructions much less noisy on targets where calls clobber lots
1507 // of registers. Don't rely on MO.isDead() because we may be called before
1508 // LiveVariables is run, or we may be looking at a non-allocatable reg.
1509 if (MF && isCall() &&
1510 MO.isReg() && MO.isImplicit() && MO.isDef()) {
1511 unsigned Reg = MO.getReg();
1512 if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
1513 const MachineRegisterInfo &MRI = MF->getRegInfo();
1514 if (MRI.use_empty(Reg) && !MRI.isLiveOut(Reg)) {
1515 bool HasAliasLive = false;
1516 for (MCRegAliasIterator AI(Reg, TM->getRegisterInfo(), true);
1517 AI.isValid(); ++AI) {
1518 unsigned AliasReg = *AI;
1519 if (!MRI.use_empty(AliasReg) || MRI.isLiveOut(AliasReg)) {
1520 HasAliasLive = true;
1524 if (!HasAliasLive) {
1525 OmittedAnyCallClobbers = true;
1532 if (FirstOp) FirstOp = false; else OS << ",";
1534 if (i < getDesc().NumOperands) {
1535 const MCOperandInfo &MCOI = getDesc().OpInfo[i];
1536 if (MCOI.isPredicate())
1538 if (MCOI.isOptionalDef())
1541 if (isDebugValue() && MO.isMetadata()) {
1542 // Pretty print DBG_VALUE instructions.
1543 const MDNode *MD = MO.getMetadata();
1544 if (const MDString *MDS = dyn_cast<MDString>(MD->getOperand(2)))
1545 OS << "!\"" << MDS->getString() << '\"';
1548 } else if (TM && (isInsertSubreg() || isRegSequence()) && MO.isImm()) {
1549 OS << TM->getRegisterInfo()->getSubRegIndexName(MO.getImm());
1550 } else if (i == AsmDescOp && MO.isImm()) {
1551 // Pretty print the inline asm operand descriptor.
1552 OS << '$' << AsmOpCount++;
1553 unsigned Flag = MO.getImm();
1554 switch (InlineAsm::getKind(Flag)) {
1555 case InlineAsm::Kind_RegUse: OS << ":[reguse"; break;
1556 case InlineAsm::Kind_RegDef: OS << ":[regdef"; break;
1557 case InlineAsm::Kind_RegDefEarlyClobber: OS << ":[regdef-ec"; break;
1558 case InlineAsm::Kind_Clobber: OS << ":[clobber"; break;
1559 case InlineAsm::Kind_Imm: OS << ":[imm"; break;
1560 case InlineAsm::Kind_Mem: OS << ":[mem"; break;
1561 default: OS << ":[??" << InlineAsm::getKind(Flag); break;
1565 if (InlineAsm::hasRegClassConstraint(Flag, RCID)) {
1567 OS << ':' << TM->getRegisterInfo()->getRegClass(RCID)->getName();
1569 OS << ":RC" << RCID;
1572 unsigned TiedTo = 0;
1573 if (InlineAsm::isUseOperandTiedToDef(Flag, TiedTo))
1574 OS << " tiedto:$" << TiedTo;
1578 // Compute the index of the next operand descriptor.
1579 AsmDescOp += 1 + InlineAsm::getNumOperandRegisters(Flag);
1584 // Briefly indicate whether any call clobbers were omitted.
1585 if (OmittedAnyCallClobbers) {
1586 if (!FirstOp) OS << ",";
1590 bool HaveSemi = false;
1591 const unsigned PrintableFlags = FrameSetup;
1592 if (Flags & PrintableFlags) {
1593 if (!HaveSemi) OS << ";"; HaveSemi = true;
1596 if (Flags & FrameSetup)
1600 if (!memoperands_empty()) {
1601 if (!HaveSemi) OS << ";"; HaveSemi = true;
1604 for (mmo_iterator i = memoperands_begin(), e = memoperands_end();
1607 if (llvm::next(i) != e)
1612 // Print the regclass of any virtual registers encountered.
1613 if (MRI && !VirtRegs.empty()) {
1614 if (!HaveSemi) OS << ";"; HaveSemi = true;
1615 for (unsigned i = 0; i != VirtRegs.size(); ++i) {
1616 const TargetRegisterClass *RC = MRI->getRegClass(VirtRegs[i]);
1617 OS << " " << RC->getName() << ':' << PrintReg(VirtRegs[i]);
1618 for (unsigned j = i+1; j != VirtRegs.size();) {
1619 if (MRI->getRegClass(VirtRegs[j]) != RC) {
1623 if (VirtRegs[i] != VirtRegs[j])
1624 OS << "," << PrintReg(VirtRegs[j]);
1625 VirtRegs.erase(VirtRegs.begin()+j);
1630 // Print debug location information.
1631 if (isDebugValue() && getOperand(e - 1).isMetadata()) {
1632 if (!HaveSemi) OS << ";"; HaveSemi = true;
1633 DIVariable DV(getOperand(e - 1).getMetadata());
1634 OS << " line no:" << DV.getLineNumber();
1635 if (MDNode *InlinedAt = DV.getInlinedAt()) {
1636 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(InlinedAt);
1637 if (!InlinedAtDL.isUnknown()) {
1638 OS << " inlined @[ ";
1639 printDebugLoc(InlinedAtDL, MF, OS);
1643 } else if (!debugLoc.isUnknown() && MF) {
1644 if (!HaveSemi) OS << ";"; HaveSemi = true;
1646 printDebugLoc(debugLoc, MF, OS);
1652 bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
1653 const TargetRegisterInfo *RegInfo,
1654 bool AddIfNotFound) {
1655 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
1656 bool hasAliases = isPhysReg &&
1657 MCRegAliasIterator(IncomingReg, RegInfo, false).isValid();
1659 SmallVector<unsigned,4> DeadOps;
1660 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1661 MachineOperand &MO = getOperand(i);
1662 if (!MO.isReg() || !MO.isUse() || MO.isUndef())
1664 unsigned Reg = MO.getReg();
1668 if (Reg == IncomingReg) {
1671 // The register is already marked kill.
1673 if (isPhysReg && isRegTiedToDefOperand(i))
1674 // Two-address uses of physregs must not be marked kill.
1679 } else if (hasAliases && MO.isKill() &&
1680 TargetRegisterInfo::isPhysicalRegister(Reg)) {
1681 // A super-register kill already exists.
1682 if (RegInfo->isSuperRegister(IncomingReg, Reg))
1684 if (RegInfo->isSubRegister(IncomingReg, Reg))
1685 DeadOps.push_back(i);
1689 // Trim unneeded kill operands.
1690 while (!DeadOps.empty()) {
1691 unsigned OpIdx = DeadOps.back();
1692 if (getOperand(OpIdx).isImplicit())
1693 RemoveOperand(OpIdx);
1695 getOperand(OpIdx).setIsKill(false);
1699 // If not found, this means an alias of one of the operands is killed. Add a
1700 // new implicit operand if required.
1701 if (!Found && AddIfNotFound) {
1702 addOperand(MachineOperand::CreateReg(IncomingReg,
1711 void MachineInstr::clearRegisterKills(unsigned Reg,
1712 const TargetRegisterInfo *RegInfo) {
1713 if (!TargetRegisterInfo::isPhysicalRegister(Reg))
1715 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1716 MachineOperand &MO = getOperand(i);
1717 if (!MO.isReg() || !MO.isUse() || !MO.isKill())
1719 unsigned OpReg = MO.getReg();
1720 if (OpReg == Reg || (RegInfo && RegInfo->isSuperRegister(Reg, OpReg)))
1721 MO.setIsKill(false);
1725 bool MachineInstr::addRegisterDead(unsigned IncomingReg,
1726 const TargetRegisterInfo *RegInfo,
1727 bool AddIfNotFound) {
1728 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
1729 bool hasAliases = isPhysReg &&
1730 MCRegAliasIterator(IncomingReg, RegInfo, false).isValid();
1732 SmallVector<unsigned,4> DeadOps;
1733 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1734 MachineOperand &MO = getOperand(i);
1735 if (!MO.isReg() || !MO.isDef())
1737 unsigned Reg = MO.getReg();
1741 if (Reg == IncomingReg) {
1744 } else if (hasAliases && MO.isDead() &&
1745 TargetRegisterInfo::isPhysicalRegister(Reg)) {
1746 // There exists a super-register that's marked dead.
1747 if (RegInfo->isSuperRegister(IncomingReg, Reg))
1749 if (RegInfo->isSubRegister(IncomingReg, Reg))
1750 DeadOps.push_back(i);
1754 // Trim unneeded dead operands.
1755 while (!DeadOps.empty()) {
1756 unsigned OpIdx = DeadOps.back();
1757 if (getOperand(OpIdx).isImplicit())
1758 RemoveOperand(OpIdx);
1760 getOperand(OpIdx).setIsDead(false);
1764 // If not found, this means an alias of one of the operands is dead. Add a
1765 // new implicit operand if required.
1766 if (Found || !AddIfNotFound)
1769 addOperand(MachineOperand::CreateReg(IncomingReg,
1777 void MachineInstr::addRegisterDefined(unsigned IncomingReg,
1778 const TargetRegisterInfo *RegInfo) {
1779 if (TargetRegisterInfo::isPhysicalRegister(IncomingReg)) {
1780 MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo);
1784 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1785 const MachineOperand &MO = getOperand(i);
1786 if (MO.isReg() && MO.getReg() == IncomingReg && MO.isDef() &&
1787 MO.getSubReg() == 0)
1791 addOperand(MachineOperand::CreateReg(IncomingReg,
1796 void MachineInstr::setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs,
1797 const TargetRegisterInfo &TRI) {
1798 bool HasRegMask = false;
1799 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1800 MachineOperand &MO = getOperand(i);
1801 if (MO.isRegMask()) {
1805 if (!MO.isReg() || !MO.isDef()) continue;
1806 unsigned Reg = MO.getReg();
1807 if (!TargetRegisterInfo::isPhysicalRegister(Reg)) continue;
1809 for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
1811 if (TRI.regsOverlap(*I, Reg)) {
1815 // If there are no uses, including partial uses, the def is dead.
1816 if (Dead) MO.setIsDead();
1819 // This is a call with a register mask operand.
1820 // Mask clobbers are always dead, so add defs for the non-dead defines.
1822 for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
1824 addRegisterDefined(*I, &TRI);
1828 MachineInstrExpressionTrait::getHashValue(const MachineInstr* const &MI) {
1829 // Build up a buffer of hash code components.
1830 SmallVector<size_t, 8> HashComponents;
1831 HashComponents.reserve(MI->getNumOperands() + 1);
1832 HashComponents.push_back(MI->getOpcode());
1833 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
1834 const MachineOperand &MO = MI->getOperand(i);
1835 if (MO.isReg() && MO.isDef() &&
1836 TargetRegisterInfo::isVirtualRegister(MO.getReg()))
1837 continue; // Skip virtual register defs.
1839 HashComponents.push_back(hash_value(MO));
1841 return hash_combine_range(HashComponents.begin(), HashComponents.end());
1844 void MachineInstr::emitError(StringRef Msg) const {
1845 // Find the source location cookie.
1846 unsigned LocCookie = 0;
1847 const MDNode *LocMD = 0;
1848 for (unsigned i = getNumOperands(); i != 0; --i) {
1849 if (getOperand(i-1).isMetadata() &&
1850 (LocMD = getOperand(i-1).getMetadata()) &&
1851 LocMD->getNumOperands() != 0) {
1852 if (const ConstantInt *CI = dyn_cast<ConstantInt>(LocMD->getOperand(0))) {
1853 LocCookie = CI->getZExtValue();
1859 if (const MachineBasicBlock *MBB = getParent())
1860 if (const MachineFunction *MF = MBB->getParent())
1861 return MF->getMMI().getModule()->getContext().emitError(LocCookie, Msg);
1862 report_fatal_error(Msg);