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/Constants.h"
15 #include "llvm/CodeGen/MachineInstr.h"
16 #include "llvm/Value.h"
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/CodeGen/MachineRegisterInfo.h"
19 #include "llvm/CodeGen/PseudoSourceValue.h"
20 #include "llvm/Target/TargetMachine.h"
21 #include "llvm/Target/TargetInstrInfo.h"
22 #include "llvm/Target/TargetInstrDesc.h"
23 #include "llvm/Target/TargetRegisterInfo.h"
24 #include "llvm/Support/LeakDetector.h"
25 #include "llvm/Support/MathExtras.h"
26 #include "llvm/Support/Streams.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include "llvm/ADT/FoldingSet.h"
32 //===----------------------------------------------------------------------===//
33 // MachineOperand Implementation
34 //===----------------------------------------------------------------------===//
36 /// AddRegOperandToRegInfo - Add this register operand to the specified
37 /// MachineRegisterInfo. If it is null, then the next/prev fields should be
38 /// explicitly nulled out.
39 void MachineOperand::AddRegOperandToRegInfo(MachineRegisterInfo *RegInfo) {
40 assert(isReg() && "Can only add reg operand to use lists");
42 // If the reginfo pointer is null, just explicitly null out or next/prev
43 // pointers, to ensure they are not garbage.
45 Contents.Reg.Prev = 0;
46 Contents.Reg.Next = 0;
50 // Otherwise, add this operand to the head of the registers use/def list.
51 MachineOperand **Head = &RegInfo->getRegUseDefListHead(getReg());
53 // For SSA values, we prefer to keep the definition at the start of the list.
54 // we do this by skipping over the definition if it is at the head of the
56 if (*Head && (*Head)->isDef())
57 Head = &(*Head)->Contents.Reg.Next;
59 Contents.Reg.Next = *Head;
60 if (Contents.Reg.Next) {
61 assert(getReg() == Contents.Reg.Next->getReg() &&
62 "Different regs on the same list!");
63 Contents.Reg.Next->Contents.Reg.Prev = &Contents.Reg.Next;
66 Contents.Reg.Prev = Head;
70 void MachineOperand::setReg(unsigned Reg) {
71 if (getReg() == Reg) return; // No change.
73 // Otherwise, we have to change the register. If this operand is embedded
74 // into a machine function, we need to update the old and new register's
76 if (MachineInstr *MI = getParent())
77 if (MachineBasicBlock *MBB = MI->getParent())
78 if (MachineFunction *MF = MBB->getParent()) {
79 RemoveRegOperandFromRegInfo();
80 Contents.Reg.RegNo = Reg;
81 AddRegOperandToRegInfo(&MF->getRegInfo());
85 // Otherwise, just change the register, no problem. :)
86 Contents.Reg.RegNo = Reg;
89 /// ChangeToImmediate - Replace this operand with a new immediate operand of
90 /// the specified value. If an operand is known to be an immediate already,
91 /// the setImm method should be used.
92 void MachineOperand::ChangeToImmediate(int64_t ImmVal) {
93 // If this operand is currently a register operand, and if this is in a
94 // function, deregister the operand from the register's use/def list.
95 if (isReg() && getParent() && getParent()->getParent() &&
96 getParent()->getParent()->getParent())
97 RemoveRegOperandFromRegInfo();
99 OpKind = MO_Immediate;
100 Contents.ImmVal = ImmVal;
103 /// ChangeToRegister - Replace this operand with a new register operand of
104 /// the specified value. If an operand is known to be an register already,
105 /// the setReg method should be used.
106 void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
107 bool isKill, bool isDead) {
108 // If this operand is already a register operand, use setReg to update the
109 // register's use/def lists.
111 assert(!isEarlyClobber());
114 // Otherwise, change this to a register and set the reg#.
115 OpKind = MO_Register;
116 Contents.Reg.RegNo = Reg;
118 // If this operand is embedded in a function, add the operand to the
119 // register's use/def list.
120 if (MachineInstr *MI = getParent())
121 if (MachineBasicBlock *MBB = MI->getParent())
122 if (MachineFunction *MF = MBB->getParent())
123 AddRegOperandToRegInfo(&MF->getRegInfo());
130 IsEarlyClobber = false;
134 /// isIdenticalTo - Return true if this operand is identical to the specified
136 bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
137 if (getType() != Other.getType()) return false;
140 default: assert(0 && "Unrecognized operand type");
141 case MachineOperand::MO_Register:
142 return getReg() == Other.getReg() && isDef() == Other.isDef() &&
143 getSubReg() == Other.getSubReg();
144 case MachineOperand::MO_Immediate:
145 return getImm() == Other.getImm();
146 case MachineOperand::MO_FPImmediate:
147 return getFPImm() == Other.getFPImm();
148 case MachineOperand::MO_MachineBasicBlock:
149 return getMBB() == Other.getMBB();
150 case MachineOperand::MO_FrameIndex:
151 return getIndex() == Other.getIndex();
152 case MachineOperand::MO_ConstantPoolIndex:
153 return getIndex() == Other.getIndex() && getOffset() == Other.getOffset();
154 case MachineOperand::MO_JumpTableIndex:
155 return getIndex() == Other.getIndex();
156 case MachineOperand::MO_GlobalAddress:
157 return getGlobal() == Other.getGlobal() && getOffset() == Other.getOffset();
158 case MachineOperand::MO_ExternalSymbol:
159 return !strcmp(getSymbolName(), Other.getSymbolName()) &&
160 getOffset() == Other.getOffset();
164 /// print - Print the specified machine operand.
166 void MachineOperand::print(std::ostream &OS, const TargetMachine *TM) const {
167 raw_os_ostream RawOS(OS);
171 void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
173 case MachineOperand::MO_Register:
174 if (getReg() == 0 || TargetRegisterInfo::isVirtualRegister(getReg())) {
175 OS << "%reg" << getReg();
177 // If the instruction is embedded into a basic block, we can find the
178 // target info for the instruction.
180 if (const MachineInstr *MI = getParent())
181 if (const MachineBasicBlock *MBB = MI->getParent())
182 if (const MachineFunction *MF = MBB->getParent())
183 TM = &MF->getTarget();
186 OS << "%" << TM->getRegisterInfo()->get(getReg()).Name;
188 OS << "%mreg" << getReg();
191 if (getSubReg() != 0) {
192 OS << ":" << getSubReg();
195 if (isDef() || isKill() || isDead() || isImplicit() || isEarlyClobber()) {
197 bool NeedComma = false;
199 if (NeedComma) OS << ",";
200 OS << (isDef() ? "imp-def" : "imp-use");
202 } else if (isDef()) {
203 if (NeedComma) OS << ",";
204 if (isEarlyClobber())
205 OS << "earlyclobber,";
209 if (isKill() || isDead()) {
210 if (NeedComma) OS << ",";
211 if (isKill()) OS << "kill";
212 if (isDead()) OS << "dead";
217 case MachineOperand::MO_Immediate:
220 case MachineOperand::MO_FPImmediate:
221 if (getFPImm()->getType() == Type::FloatTy) {
222 OS << getFPImm()->getValueAPF().convertToFloat();
224 OS << getFPImm()->getValueAPF().convertToDouble();
227 case MachineOperand::MO_MachineBasicBlock:
229 << ((Value*)getMBB()->getBasicBlock())->getName()
230 << "," << (void*)getMBB() << ">";
232 case MachineOperand::MO_FrameIndex:
233 OS << "<fi#" << getIndex() << ">";
235 case MachineOperand::MO_ConstantPoolIndex:
236 OS << "<cp#" << getIndex();
237 if (getOffset()) OS << "+" << getOffset();
240 case MachineOperand::MO_JumpTableIndex:
241 OS << "<jt#" << getIndex() << ">";
243 case MachineOperand::MO_GlobalAddress:
244 OS << "<ga:" << ((Value*)getGlobal())->getName();
245 if (getOffset()) OS << "+" << getOffset();
248 case MachineOperand::MO_ExternalSymbol:
249 OS << "<es:" << getSymbolName();
250 if (getOffset()) OS << "+" << getOffset();
254 assert(0 && "Unrecognized operand type");
258 //===----------------------------------------------------------------------===//
259 // MachineMemOperand Implementation
260 //===----------------------------------------------------------------------===//
262 MachineMemOperand::MachineMemOperand(const Value *v, unsigned int f,
263 int64_t o, uint64_t s, unsigned int a)
264 : Offset(o), Size(s), V(v),
265 Flags((f & 7) | ((Log2_32(a) + 1) << 3)) {
266 assert(isPowerOf2_32(a) && "Alignment is not a power of 2!");
267 assert((isLoad() || isStore()) && "Not a load/store!");
270 /// Profile - Gather unique data for the object.
272 void MachineMemOperand::Profile(FoldingSetNodeID &ID) const {
273 ID.AddInteger(Offset);
276 ID.AddInteger(Flags);
279 //===----------------------------------------------------------------------===//
280 // MachineInstr Implementation
281 //===----------------------------------------------------------------------===//
283 /// MachineInstr ctor - This constructor creates a dummy MachineInstr with
284 /// TID NULL and no operands.
285 MachineInstr::MachineInstr()
286 : TID(0), NumImplicitOps(0), Parent(0) {
287 // Make sure that we get added to a machine basicblock
288 LeakDetector::addGarbageObject(this);
291 void MachineInstr::addImplicitDefUseOperands() {
292 if (TID->ImplicitDefs)
293 for (const unsigned *ImpDefs = TID->ImplicitDefs; *ImpDefs; ++ImpDefs)
294 addOperand(MachineOperand::CreateReg(*ImpDefs, true, true));
295 if (TID->ImplicitUses)
296 for (const unsigned *ImpUses = TID->ImplicitUses; *ImpUses; ++ImpUses)
297 addOperand(MachineOperand::CreateReg(*ImpUses, false, true));
300 /// MachineInstr ctor - This constructor create a MachineInstr and add the
301 /// implicit operands. It reserves space for number of operands specified by
302 /// TargetInstrDesc or the numOperands if it is not zero. (for
303 /// instructions with variable number of operands).
304 MachineInstr::MachineInstr(const TargetInstrDesc &tid, bool NoImp)
305 : TID(&tid), NumImplicitOps(0), Parent(0) {
306 if (!NoImp && TID->getImplicitDefs())
307 for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
309 if (!NoImp && TID->getImplicitUses())
310 for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
312 Operands.reserve(NumImplicitOps + TID->getNumOperands());
314 addImplicitDefUseOperands();
315 // Make sure that we get added to a machine basicblock
316 LeakDetector::addGarbageObject(this);
319 /// MachineInstr ctor - Work exactly the same as the ctor above, except that the
320 /// MachineInstr is created and added to the end of the specified basic block.
322 MachineInstr::MachineInstr(MachineBasicBlock *MBB,
323 const TargetInstrDesc &tid)
324 : TID(&tid), NumImplicitOps(0), Parent(0) {
325 assert(MBB && "Cannot use inserting ctor with null basic block!");
326 if (TID->ImplicitDefs)
327 for (const unsigned *ImpDefs = TID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
329 if (TID->ImplicitUses)
330 for (const unsigned *ImpUses = TID->getImplicitUses(); *ImpUses; ++ImpUses)
332 Operands.reserve(NumImplicitOps + TID->getNumOperands());
333 addImplicitDefUseOperands();
334 // Make sure that we get added to a machine basicblock
335 LeakDetector::addGarbageObject(this);
336 MBB->push_back(this); // Add instruction to end of basic block!
339 /// MachineInstr ctor - Copies MachineInstr arg exactly
341 MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI)
342 : TID(&MI.getDesc()), NumImplicitOps(0), Parent(0) {
343 Operands.reserve(MI.getNumOperands());
346 for (unsigned i = 0; i != MI.getNumOperands(); ++i)
347 addOperand(MI.getOperand(i));
348 NumImplicitOps = MI.NumImplicitOps;
350 // Add memory operands.
351 for (std::list<MachineMemOperand>::const_iterator i = MI.memoperands_begin(),
352 j = MI.memoperands_end(); i != j; ++i)
353 addMemOperand(MF, *i);
355 // Set parent to null.
358 LeakDetector::addGarbageObject(this);
361 MachineInstr::~MachineInstr() {
362 LeakDetector::removeGarbageObject(this);
363 assert(MemOperands.empty() &&
364 "MachineInstr being deleted with live memoperands!");
366 for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
367 assert(Operands[i].ParentMI == this && "ParentMI mismatch!");
368 assert((!Operands[i].isReg() || !Operands[i].isOnRegUseList()) &&
369 "Reg operand def/use list corrupted");
374 /// getRegInfo - If this instruction is embedded into a MachineFunction,
375 /// return the MachineRegisterInfo object for the current function, otherwise
377 MachineRegisterInfo *MachineInstr::getRegInfo() {
378 if (MachineBasicBlock *MBB = getParent())
379 return &MBB->getParent()->getRegInfo();
383 /// RemoveRegOperandsFromUseLists - Unlink all of the register operands in
384 /// this instruction from their respective use lists. This requires that the
385 /// operands already be on their use lists.
386 void MachineInstr::RemoveRegOperandsFromUseLists() {
387 for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
388 if (Operands[i].isReg())
389 Operands[i].RemoveRegOperandFromRegInfo();
393 /// AddRegOperandsToUseLists - Add all of the register operands in
394 /// this instruction from their respective use lists. This requires that the
395 /// operands not be on their use lists yet.
396 void MachineInstr::AddRegOperandsToUseLists(MachineRegisterInfo &RegInfo) {
397 for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
398 if (Operands[i].isReg())
399 Operands[i].AddRegOperandToRegInfo(&RegInfo);
404 /// addOperand - Add the specified operand to the instruction. If it is an
405 /// implicit operand, it is added to the end of the operand list. If it is
406 /// an explicit operand it is added at the end of the explicit operand list
407 /// (before the first implicit operand).
408 void MachineInstr::addOperand(const MachineOperand &Op) {
409 bool isImpReg = Op.isReg() && Op.isImplicit();
410 assert((isImpReg || !OperandsComplete()) &&
411 "Trying to add an operand to a machine instr that is already done!");
413 MachineRegisterInfo *RegInfo = getRegInfo();
415 // If we are adding the operand to the end of the list, our job is simpler.
416 // This is true most of the time, so this is a reasonable optimization.
417 if (isImpReg || NumImplicitOps == 0) {
418 // We can only do this optimization if we know that the operand list won't
420 if (Operands.empty() || Operands.size()+1 <= Operands.capacity()) {
421 Operands.push_back(Op);
423 // Set the parent of the operand.
424 Operands.back().ParentMI = this;
426 // If the operand is a register, update the operand's use list.
428 Operands.back().AddRegOperandToRegInfo(RegInfo);
433 // Otherwise, we have to insert a real operand before any implicit ones.
434 unsigned OpNo = Operands.size()-NumImplicitOps;
436 // If this instruction isn't embedded into a function, then we don't need to
437 // update any operand lists.
439 // Simple insertion, no reginfo update needed for other register operands.
440 Operands.insert(Operands.begin()+OpNo, Op);
441 Operands[OpNo].ParentMI = this;
443 // Do explicitly set the reginfo for this operand though, to ensure the
444 // next/prev fields are properly nulled out.
445 if (Operands[OpNo].isReg())
446 Operands[OpNo].AddRegOperandToRegInfo(0);
448 } else if (Operands.size()+1 <= Operands.capacity()) {
449 // Otherwise, we have to remove register operands from their register use
450 // list, add the operand, then add the register operands back to their use
451 // list. This also must handle the case when the operand list reallocates
452 // to somewhere else.
454 // If insertion of this operand won't cause reallocation of the operand
455 // list, just remove the implicit operands, add the operand, then re-add all
456 // the rest of the operands.
457 for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) {
458 assert(Operands[i].isReg() && "Should only be an implicit reg!");
459 Operands[i].RemoveRegOperandFromRegInfo();
462 // Add the operand. If it is a register, add it to the reg list.
463 Operands.insert(Operands.begin()+OpNo, Op);
464 Operands[OpNo].ParentMI = this;
466 if (Operands[OpNo].isReg())
467 Operands[OpNo].AddRegOperandToRegInfo(RegInfo);
469 // Re-add all the implicit ops.
470 for (unsigned i = OpNo+1, e = Operands.size(); i != e; ++i) {
471 assert(Operands[i].isReg() && "Should only be an implicit reg!");
472 Operands[i].AddRegOperandToRegInfo(RegInfo);
475 // Otherwise, we will be reallocating the operand list. Remove all reg
476 // operands from their list, then readd them after the operand list is
478 RemoveRegOperandsFromUseLists();
480 Operands.insert(Operands.begin()+OpNo, Op);
481 Operands[OpNo].ParentMI = this;
483 // Re-add all the operands.
484 AddRegOperandsToUseLists(*RegInfo);
488 /// RemoveOperand - Erase an operand from an instruction, leaving it with one
489 /// fewer operand than it started with.
491 void MachineInstr::RemoveOperand(unsigned OpNo) {
492 assert(OpNo < Operands.size() && "Invalid operand number");
494 // Special case removing the last one.
495 if (OpNo == Operands.size()-1) {
496 // If needed, remove from the reg def/use list.
497 if (Operands.back().isReg() && Operands.back().isOnRegUseList())
498 Operands.back().RemoveRegOperandFromRegInfo();
504 // Otherwise, we are removing an interior operand. If we have reginfo to
505 // update, remove all operands that will be shifted down from their reg lists,
506 // move everything down, then re-add them.
507 MachineRegisterInfo *RegInfo = getRegInfo();
509 for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) {
510 if (Operands[i].isReg())
511 Operands[i].RemoveRegOperandFromRegInfo();
515 Operands.erase(Operands.begin()+OpNo);
518 for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) {
519 if (Operands[i].isReg())
520 Operands[i].AddRegOperandToRegInfo(RegInfo);
525 /// addMemOperand - Add a MachineMemOperand to the machine instruction,
526 /// referencing arbitrary storage.
527 void MachineInstr::addMemOperand(MachineFunction &MF,
528 const MachineMemOperand &MO) {
529 MemOperands.push_back(MO);
532 /// clearMemOperands - Erase all of this MachineInstr's MachineMemOperands.
533 void MachineInstr::clearMemOperands(MachineFunction &MF) {
538 /// removeFromParent - This method unlinks 'this' from the containing basic
539 /// block, and returns it, but does not delete it.
540 MachineInstr *MachineInstr::removeFromParent() {
541 assert(getParent() && "Not embedded in a basic block!");
542 getParent()->remove(this);
547 /// eraseFromParent - This method unlinks 'this' from the containing basic
548 /// block, and deletes it.
549 void MachineInstr::eraseFromParent() {
550 assert(getParent() && "Not embedded in a basic block!");
551 getParent()->erase(this);
555 /// OperandComplete - Return true if it's illegal to add a new operand
557 bool MachineInstr::OperandsComplete() const {
558 unsigned short NumOperands = TID->getNumOperands();
559 if (!TID->isVariadic() && getNumOperands()-NumImplicitOps >= NumOperands)
560 return true; // Broken: we have all the operands of this instruction!
564 /// getNumExplicitOperands - Returns the number of non-implicit operands.
566 unsigned MachineInstr::getNumExplicitOperands() const {
567 unsigned NumOperands = TID->getNumOperands();
568 if (!TID->isVariadic())
571 for (unsigned e = getNumOperands(); NumOperands != e; ++NumOperands) {
572 const MachineOperand &MO = getOperand(NumOperands);
573 if (!MO.isReg() || !MO.isImplicit())
580 /// isLabel - Returns true if the MachineInstr represents a label.
582 bool MachineInstr::isLabel() const {
583 return getOpcode() == TargetInstrInfo::DBG_LABEL ||
584 getOpcode() == TargetInstrInfo::EH_LABEL ||
585 getOpcode() == TargetInstrInfo::GC_LABEL;
588 /// isDebugLabel - Returns true if the MachineInstr represents a debug label.
590 bool MachineInstr::isDebugLabel() const {
591 return getOpcode() == TargetInstrInfo::DBG_LABEL;
594 /// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of
595 /// the specific register or -1 if it is not found. It further tightening
596 /// the search criteria to a use that kills the register if isKill is true.
597 int MachineInstr::findRegisterUseOperandIdx(unsigned Reg, bool isKill,
598 const TargetRegisterInfo *TRI) const {
599 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
600 const MachineOperand &MO = getOperand(i);
601 if (!MO.isReg() || !MO.isUse())
603 unsigned MOReg = MO.getReg();
608 TargetRegisterInfo::isPhysicalRegister(MOReg) &&
609 TargetRegisterInfo::isPhysicalRegister(Reg) &&
610 TRI->isSubRegister(MOReg, Reg)))
611 if (!isKill || MO.isKill())
617 /// findRegisterDefOperandIdx() - Returns the operand index that is a def of
618 /// the specified register or -1 if it is not found. If isDead is true, defs
619 /// that are not dead are skipped. If TargetRegisterInfo is non-null, then it
620 /// also checks if there is a def of a super-register.
621 int MachineInstr::findRegisterDefOperandIdx(unsigned Reg, bool isDead,
622 const TargetRegisterInfo *TRI) const {
623 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
624 const MachineOperand &MO = getOperand(i);
625 if (!MO.isReg() || !MO.isDef())
627 unsigned MOReg = MO.getReg();
630 TargetRegisterInfo::isPhysicalRegister(MOReg) &&
631 TargetRegisterInfo::isPhysicalRegister(Reg) &&
632 TRI->isSubRegister(MOReg, Reg)))
633 if (!isDead || MO.isDead())
639 /// findFirstPredOperandIdx() - Find the index of the first operand in the
640 /// operand list that is used to represent the predicate. It returns -1 if
642 int MachineInstr::findFirstPredOperandIdx() const {
643 const TargetInstrDesc &TID = getDesc();
644 if (TID.isPredicable()) {
645 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
646 if (TID.OpInfo[i].isPredicate())
653 /// isRegReDefinedByTwoAddr - Given the index of a register def operand,
654 /// check if the register def is a re-definition due to two addr elimination.
655 bool MachineInstr::isRegReDefinedByTwoAddr(unsigned DefIdx) const{
656 assert(getOperand(DefIdx).isDef() && "DefIdx is not a def!");
657 const TargetInstrDesc &TID = getDesc();
658 for (unsigned i = 0, e = TID.getNumOperands(); i != e; ++i) {
659 const MachineOperand &MO = getOperand(i);
660 if (MO.isReg() && MO.isUse() &&
661 TID.getOperandConstraint(i, TOI::TIED_TO) == (int)DefIdx)
667 /// copyKillDeadInfo - Copies kill / dead operand properties from MI.
669 void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) {
670 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
671 const MachineOperand &MO = MI->getOperand(i);
672 if (!MO.isReg() || (!MO.isKill() && !MO.isDead()))
674 for (unsigned j = 0, ee = getNumOperands(); j != ee; ++j) {
675 MachineOperand &MOp = getOperand(j);
676 if (!MOp.isIdenticalTo(MO))
687 /// copyPredicates - Copies predicate operand(s) from MI.
688 void MachineInstr::copyPredicates(const MachineInstr *MI) {
689 const TargetInstrDesc &TID = MI->getDesc();
690 if (!TID.isPredicable())
692 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
693 if (TID.OpInfo[i].isPredicate()) {
694 // Predicated operands must be last operands.
695 addOperand(MI->getOperand(i));
700 /// isSafeToMove - Return true if it is safe to move this instruction. If
701 /// SawStore is set to true, it means that there is a store (or call) between
702 /// the instruction's location and its intended destination.
703 bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII,
704 bool &SawStore) const {
705 // Ignore stuff that we obviously can't move.
706 if (TID->mayStore() || TID->isCall()) {
710 if (TID->isTerminator() || TID->hasUnmodeledSideEffects())
713 // See if this instruction does a load. If so, we have to guarantee that the
714 // loaded value doesn't change between the load and the its intended
715 // destination. The check for isInvariantLoad gives the targe the chance to
716 // classify the load as always returning a constant, e.g. a constant pool
718 if (TID->mayLoad() && !TII->isInvariantLoad(this))
719 // Otherwise, this is a real load. If there is a store between the load and
720 // end of block, or if the laod is volatile, we can't move it.
721 return !SawStore && !hasVolatileMemoryRef();
726 /// isSafeToReMat - Return true if it's safe to rematerialize the specified
727 /// instruction which defined the specified register instead of copying it.
728 bool MachineInstr::isSafeToReMat(const TargetInstrInfo *TII,
729 unsigned DstReg) const {
730 bool SawStore = false;
731 if (!getDesc().isRematerializable() ||
732 !TII->isTriviallyReMaterializable(this) ||
733 !isSafeToMove(TII, SawStore))
735 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
736 const MachineOperand &MO = getOperand(i);
739 // FIXME: For now, do not remat any instruction with register operands.
740 // Later on, we can loosen the restriction is the register operands have
741 // not been modified between the def and use. Note, this is different from
742 // MachineSink because the code is no longer in two-address form (at least
746 else if (!MO.isDead() && MO.getReg() != DstReg)
752 /// hasVolatileMemoryRef - Return true if this instruction may have a
753 /// volatile memory reference, or if the information describing the
754 /// memory reference is not available. Return false if it is known to
755 /// have no volatile memory references.
756 bool MachineInstr::hasVolatileMemoryRef() const {
757 // An instruction known never to access memory won't have a volatile access.
758 if (!TID->mayStore() &&
761 !TID->hasUnmodeledSideEffects())
764 // Otherwise, if the instruction has no memory reference information,
765 // conservatively assume it wasn't preserved.
766 if (memoperands_empty())
769 // Check the memory reference information for volatile references.
770 for (std::list<MachineMemOperand>::const_iterator I = memoperands_begin(),
771 E = memoperands_end(); I != E; ++I)
778 void MachineInstr::dump() const {
779 cerr << " " << *this;
782 void MachineInstr::print(std::ostream &OS, const TargetMachine *TM) const {
783 raw_os_ostream RawOS(OS);
787 void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
788 // Specialize printing if op#0 is definition
789 unsigned StartOp = 0;
790 if (getNumOperands() && getOperand(0).isReg() && getOperand(0).isDef()) {
791 getOperand(0).print(OS, TM);
793 ++StartOp; // Don't print this operand again!
796 OS << getDesc().getName();
798 for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
802 getOperand(i).print(OS, TM);
805 if (!memoperands_empty()) {
807 for (std::list<MachineMemOperand>::const_iterator i = memoperands_begin(),
808 e = memoperands_end(); i != e; ++i) {
809 const MachineMemOperand &MRO = *i;
810 const Value *V = MRO.getValue();
812 assert((MRO.isLoad() || MRO.isStore()) &&
813 "SV has to be a load, store or both.");
815 if (MRO.isVolatile())
823 OS << "(" << MRO.getSize() << "," << MRO.getAlignment() << ") [";
827 else if (!V->getName().empty())
829 else if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V)) {
834 OS << " + " << MRO.getOffset() << "]";
841 bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
842 const TargetRegisterInfo *RegInfo,
843 bool AddIfNotFound) {
844 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
845 bool hasAliases = isPhysReg && RegInfo->getAliasSet(IncomingReg);
847 SmallVector<unsigned,4> DeadOps;
848 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
849 MachineOperand &MO = getOperand(i);
850 if (!MO.isReg() || !MO.isUse())
852 unsigned Reg = MO.getReg();
856 if (Reg == IncomingReg) {
859 // The register is already marked kill.
864 } else if (hasAliases && MO.isKill() &&
865 TargetRegisterInfo::isPhysicalRegister(Reg)) {
866 // A super-register kill already exists.
867 if (RegInfo->isSuperRegister(IncomingReg, Reg))
869 if (RegInfo->isSubRegister(IncomingReg, Reg))
870 DeadOps.push_back(i);
874 // Trim unneeded kill operands.
875 while (!DeadOps.empty()) {
876 unsigned OpIdx = DeadOps.back();
877 if (getOperand(OpIdx).isImplicit())
878 RemoveOperand(OpIdx);
880 getOperand(OpIdx).setIsKill(false);
884 // If not found, this means an alias of one of the operands is killed. Add a
885 // new implicit operand if required.
886 if (!Found && AddIfNotFound) {
887 addOperand(MachineOperand::CreateReg(IncomingReg,
896 bool MachineInstr::addRegisterDead(unsigned IncomingReg,
897 const TargetRegisterInfo *RegInfo,
898 bool AddIfNotFound) {
899 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
900 bool hasAliases = isPhysReg && RegInfo->getAliasSet(IncomingReg);
902 SmallVector<unsigned,4> DeadOps;
903 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
904 MachineOperand &MO = getOperand(i);
905 if (!MO.isReg() || !MO.isDef())
907 unsigned Reg = MO.getReg();
911 if (Reg == IncomingReg) {
914 // The register is already marked dead.
919 } else if (hasAliases && MO.isDead() &&
920 TargetRegisterInfo::isPhysicalRegister(Reg)) {
921 // There exists a super-register that's marked dead.
922 if (RegInfo->isSuperRegister(IncomingReg, Reg))
924 if (RegInfo->getSubRegisters(IncomingReg) &&
925 RegInfo->getSuperRegisters(Reg) &&
926 RegInfo->isSubRegister(IncomingReg, Reg))
927 DeadOps.push_back(i);
931 // Trim unneeded dead operands.
932 while (!DeadOps.empty()) {
933 unsigned OpIdx = DeadOps.back();
934 if (getOperand(OpIdx).isImplicit())
935 RemoveOperand(OpIdx);
937 getOperand(OpIdx).setIsDead(false);
941 // If not found, this means an alias of one of the operands is dead. Add a
942 // new implicit operand if required.
943 if (!Found && AddIfNotFound) {
944 addOperand(MachineOperand::CreateReg(IncomingReg,