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/Constants.h"
16 #include "llvm/DebugInfo.h"
17 #include "llvm/Function.h"
18 #include "llvm/InlineAsm.h"
19 #include "llvm/LLVMContext.h"
20 #include "llvm/Metadata.h"
21 #include "llvm/Module.h"
22 #include "llvm/Type.h"
23 #include "llvm/Value.h"
24 #include "llvm/Assembly/Writer.h"
25 #include "llvm/CodeGen/MachineConstantPool.h"
26 #include "llvm/CodeGen/MachineFunction.h"
27 #include "llvm/CodeGen/MachineMemOperand.h"
28 #include "llvm/CodeGen/MachineModuleInfo.h"
29 #include "llvm/CodeGen/MachineRegisterInfo.h"
30 #include "llvm/CodeGen/PseudoSourceValue.h"
31 #include "llvm/MC/MCInstrDesc.h"
32 #include "llvm/MC/MCSymbol.h"
33 #include "llvm/Target/TargetMachine.h"
34 #include "llvm/Target/TargetInstrInfo.h"
35 #include "llvm/Target/TargetRegisterInfo.h"
36 #include "llvm/Analysis/AliasAnalysis.h"
37 #include "llvm/Support/Debug.h"
38 #include "llvm/Support/ErrorHandling.h"
39 #include "llvm/Support/LeakDetector.h"
40 #include "llvm/Support/MathExtras.h"
41 #include "llvm/Support/raw_ostream.h"
42 #include "llvm/ADT/FoldingSet.h"
43 #include "llvm/ADT/Hashing.h"
46 //===----------------------------------------------------------------------===//
47 // MachineOperand Implementation
48 //===----------------------------------------------------------------------===//
50 void MachineOperand::setReg(unsigned Reg) {
51 if (getReg() == Reg) return; // No change.
53 // Otherwise, we have to change the register. If this operand is embedded
54 // into a machine function, we need to update the old and new register's
56 if (MachineInstr *MI = getParent())
57 if (MachineBasicBlock *MBB = MI->getParent())
58 if (MachineFunction *MF = MBB->getParent()) {
59 MachineRegisterInfo &MRI = MF->getRegInfo();
60 MRI.removeRegOperandFromUseList(this);
61 SmallContents.RegNo = Reg;
62 MRI.addRegOperandToUseList(this);
66 // Otherwise, just change the register, no problem. :)
67 SmallContents.RegNo = Reg;
70 void MachineOperand::substVirtReg(unsigned Reg, unsigned SubIdx,
71 const TargetRegisterInfo &TRI) {
72 assert(TargetRegisterInfo::isVirtualRegister(Reg));
73 if (SubIdx && getSubReg())
74 SubIdx = TRI.composeSubRegIndices(SubIdx, getSubReg());
80 void MachineOperand::substPhysReg(unsigned Reg, const TargetRegisterInfo &TRI) {
81 assert(TargetRegisterInfo::isPhysicalRegister(Reg));
83 Reg = TRI.getSubReg(Reg, getSubReg());
84 // Note that getSubReg() may return 0 if the sub-register doesn't exist.
85 // That won't happen in legal code.
91 /// Change a def to a use, or a use to a def.
92 void MachineOperand::setIsDef(bool Val) {
93 assert(isReg() && "Wrong MachineOperand accessor");
94 assert((!Val || !isDebug()) && "Marking a debug operation as def");
97 // MRI may keep uses and defs in different list positions.
98 if (MachineInstr *MI = getParent())
99 if (MachineBasicBlock *MBB = MI->getParent())
100 if (MachineFunction *MF = MBB->getParent()) {
101 MachineRegisterInfo &MRI = MF->getRegInfo();
102 MRI.removeRegOperandFromUseList(this);
104 MRI.addRegOperandToUseList(this);
110 /// ChangeToImmediate - Replace this operand with a new immediate operand of
111 /// the specified value. If an operand is known to be an immediate already,
112 /// the setImm method should be used.
113 void MachineOperand::ChangeToImmediate(int64_t ImmVal) {
114 assert((!isReg() || !isTied()) && "Cannot change a tied operand into an imm");
115 // If this operand is currently a register operand, and if this is in a
116 // function, deregister the operand from the register's use/def list.
117 if (isReg() && isOnRegUseList())
118 if (MachineInstr *MI = getParent())
119 if (MachineBasicBlock *MBB = MI->getParent())
120 if (MachineFunction *MF = MBB->getParent())
121 MF->getRegInfo().removeRegOperandFromUseList(this);
123 OpKind = MO_Immediate;
124 Contents.ImmVal = ImmVal;
127 /// ChangeToRegister - Replace this operand with a new register operand of
128 /// the specified value. If an operand is known to be an register already,
129 /// the setReg method should be used.
130 void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp,
131 bool isKill, bool isDead, bool isUndef,
133 MachineRegisterInfo *RegInfo = 0;
134 if (MachineInstr *MI = getParent())
135 if (MachineBasicBlock *MBB = MI->getParent())
136 if (MachineFunction *MF = MBB->getParent())
137 RegInfo = &MF->getRegInfo();
138 // If this operand is already a register operand, remove it from the
139 // register's use/def lists.
140 bool WasReg = isReg();
141 if (RegInfo && WasReg)
142 RegInfo->removeRegOperandFromUseList(this);
144 // Change this to a register and set the reg#.
145 OpKind = MO_Register;
146 SmallContents.RegNo = Reg;
153 IsInternalRead = false;
154 IsEarlyClobber = false;
156 // Ensure isOnRegUseList() returns false.
157 Contents.Reg.Prev = 0;
158 // Preserve the tie when the operand was already a register.
162 // If this operand is embedded in a function, add the operand to the
163 // register's use/def list.
165 RegInfo->addRegOperandToUseList(this);
168 /// isIdenticalTo - Return true if this operand is identical to the specified
169 /// operand. Note that this should stay in sync with the hash_value overload
171 bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
172 if (getType() != Other.getType() ||
173 getTargetFlags() != Other.getTargetFlags())
177 case MachineOperand::MO_Register:
178 return getReg() == Other.getReg() && isDef() == Other.isDef() &&
179 getSubReg() == Other.getSubReg();
180 case MachineOperand::MO_Immediate:
181 return getImm() == Other.getImm();
182 case MachineOperand::MO_CImmediate:
183 return getCImm() == Other.getCImm();
184 case MachineOperand::MO_FPImmediate:
185 return getFPImm() == Other.getFPImm();
186 case MachineOperand::MO_MachineBasicBlock:
187 return getMBB() == Other.getMBB();
188 case MachineOperand::MO_FrameIndex:
189 return getIndex() == Other.getIndex();
190 case MachineOperand::MO_ConstantPoolIndex:
191 case MachineOperand::MO_TargetIndex:
192 return getIndex() == Other.getIndex() && getOffset() == Other.getOffset();
193 case MachineOperand::MO_JumpTableIndex:
194 return getIndex() == Other.getIndex();
195 case MachineOperand::MO_GlobalAddress:
196 return getGlobal() == Other.getGlobal() && getOffset() == Other.getOffset();
197 case MachineOperand::MO_ExternalSymbol:
198 return !strcmp(getSymbolName(), Other.getSymbolName()) &&
199 getOffset() == Other.getOffset();
200 case MachineOperand::MO_BlockAddress:
201 return getBlockAddress() == Other.getBlockAddress() &&
202 getOffset() == Other.getOffset();
203 case MO_RegisterMask:
204 return getRegMask() == Other.getRegMask();
205 case MachineOperand::MO_MCSymbol:
206 return getMCSymbol() == Other.getMCSymbol();
207 case MachineOperand::MO_Metadata:
208 return getMetadata() == Other.getMetadata();
210 llvm_unreachable("Invalid machine operand type");
213 // Note: this must stay exactly in sync with isIdenticalTo above.
214 hash_code llvm::hash_value(const MachineOperand &MO) {
215 switch (MO.getType()) {
216 case MachineOperand::MO_Register:
217 // Register operands don't have target flags.
218 return hash_combine(MO.getType(), MO.getReg(), MO.getSubReg(), MO.isDef());
219 case MachineOperand::MO_Immediate:
220 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getImm());
221 case MachineOperand::MO_CImmediate:
222 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getCImm());
223 case MachineOperand::MO_FPImmediate:
224 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getFPImm());
225 case MachineOperand::MO_MachineBasicBlock:
226 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getMBB());
227 case MachineOperand::MO_FrameIndex:
228 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getIndex());
229 case MachineOperand::MO_ConstantPoolIndex:
230 case MachineOperand::MO_TargetIndex:
231 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getIndex(),
233 case MachineOperand::MO_JumpTableIndex:
234 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getIndex());
235 case MachineOperand::MO_ExternalSymbol:
236 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getOffset(),
238 case MachineOperand::MO_GlobalAddress:
239 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getGlobal(),
241 case MachineOperand::MO_BlockAddress:
242 return hash_combine(MO.getType(), MO.getTargetFlags(),
243 MO.getBlockAddress(), MO.getOffset());
244 case MachineOperand::MO_RegisterMask:
245 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getRegMask());
246 case MachineOperand::MO_Metadata:
247 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getMetadata());
248 case MachineOperand::MO_MCSymbol:
249 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getMCSymbol());
251 llvm_unreachable("Invalid machine operand type");
254 /// print - Print the specified machine operand.
256 void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const {
257 // If the instruction is embedded into a basic block, we can find the
258 // target info for the instruction.
260 if (const MachineInstr *MI = getParent())
261 if (const MachineBasicBlock *MBB = MI->getParent())
262 if (const MachineFunction *MF = MBB->getParent())
263 TM = &MF->getTarget();
264 const TargetRegisterInfo *TRI = TM ? TM->getRegisterInfo() : 0;
267 case MachineOperand::MO_Register:
268 OS << PrintReg(getReg(), TRI, getSubReg());
270 if (isDef() || isKill() || isDead() || isImplicit() || isUndef() ||
271 isInternalRead() || isEarlyClobber() || isTied()) {
273 bool NeedComma = false;
275 if (NeedComma) OS << ',';
276 if (isEarlyClobber())
277 OS << "earlyclobber,";
282 // <def,read-undef> only makes sense when getSubReg() is set.
283 // Don't clutter the output otherwise.
284 if (isUndef() && getSubReg())
286 } else if (isImplicit()) {
292 if (NeedComma) OS << ',';
297 if (NeedComma) OS << ',';
301 if (isUndef() && isUse()) {
302 if (NeedComma) OS << ',';
306 if (isInternalRead()) {
307 if (NeedComma) OS << ',';
312 if (NeedComma) OS << ',';
315 OS << unsigned(TiedTo - 1);
321 case MachineOperand::MO_Immediate:
324 case MachineOperand::MO_CImmediate:
325 getCImm()->getValue().print(OS, false);
327 case MachineOperand::MO_FPImmediate:
328 if (getFPImm()->getType()->isFloatTy())
329 OS << getFPImm()->getValueAPF().convertToFloat();
331 OS << getFPImm()->getValueAPF().convertToDouble();
333 case MachineOperand::MO_MachineBasicBlock:
334 OS << "<BB#" << getMBB()->getNumber() << ">";
336 case MachineOperand::MO_FrameIndex:
337 OS << "<fi#" << getIndex() << '>';
339 case MachineOperand::MO_ConstantPoolIndex:
340 OS << "<cp#" << getIndex();
341 if (getOffset()) OS << "+" << getOffset();
344 case MachineOperand::MO_TargetIndex:
345 OS << "<ti#" << getIndex();
346 if (getOffset()) OS << "+" << getOffset();
349 case MachineOperand::MO_JumpTableIndex:
350 OS << "<jt#" << getIndex() << '>';
352 case MachineOperand::MO_GlobalAddress:
354 WriteAsOperand(OS, getGlobal(), /*PrintType=*/false);
355 if (getOffset()) OS << "+" << getOffset();
358 case MachineOperand::MO_ExternalSymbol:
359 OS << "<es:" << getSymbolName();
360 if (getOffset()) OS << "+" << getOffset();
363 case MachineOperand::MO_BlockAddress:
365 WriteAsOperand(OS, getBlockAddress(), /*PrintType=*/false);
366 if (getOffset()) OS << "+" << getOffset();
369 case MachineOperand::MO_RegisterMask:
372 case MachineOperand::MO_Metadata:
374 WriteAsOperand(OS, getMetadata(), /*PrintType=*/false);
377 case MachineOperand::MO_MCSymbol:
378 OS << "<MCSym=" << *getMCSymbol() << '>';
382 if (unsigned TF = getTargetFlags())
383 OS << "[TF=" << TF << ']';
386 //===----------------------------------------------------------------------===//
387 // MachineMemOperand Implementation
388 //===----------------------------------------------------------------------===//
390 /// getAddrSpace - Return the LLVM IR address space number that this pointer
392 unsigned MachinePointerInfo::getAddrSpace() const {
393 if (V == 0) return 0;
394 return cast<PointerType>(V->getType())->getAddressSpace();
397 /// getConstantPool - Return a MachinePointerInfo record that refers to the
399 MachinePointerInfo MachinePointerInfo::getConstantPool() {
400 return MachinePointerInfo(PseudoSourceValue::getConstantPool());
403 /// getFixedStack - Return a MachinePointerInfo record that refers to the
404 /// the specified FrameIndex.
405 MachinePointerInfo MachinePointerInfo::getFixedStack(int FI, int64_t offset) {
406 return MachinePointerInfo(PseudoSourceValue::getFixedStack(FI), offset);
409 MachinePointerInfo MachinePointerInfo::getJumpTable() {
410 return MachinePointerInfo(PseudoSourceValue::getJumpTable());
413 MachinePointerInfo MachinePointerInfo::getGOT() {
414 return MachinePointerInfo(PseudoSourceValue::getGOT());
417 MachinePointerInfo MachinePointerInfo::getStack(int64_t Offset) {
418 return MachinePointerInfo(PseudoSourceValue::getStack(), Offset);
421 MachineMemOperand::MachineMemOperand(MachinePointerInfo ptrinfo, unsigned f,
422 uint64_t s, unsigned int a,
423 const MDNode *TBAAInfo,
424 const MDNode *Ranges)
425 : PtrInfo(ptrinfo), Size(s),
426 Flags((f & ((1 << MOMaxBits) - 1)) | ((Log2_32(a) + 1) << MOMaxBits)),
427 TBAAInfo(TBAAInfo), Ranges(Ranges) {
428 assert((PtrInfo.V == 0 || isa<PointerType>(PtrInfo.V->getType())) &&
429 "invalid pointer value");
430 assert(getBaseAlignment() == a && "Alignment is not a power of 2!");
431 assert((isLoad() || isStore()) && "Not a load/store!");
434 /// Profile - Gather unique data for the object.
436 void MachineMemOperand::Profile(FoldingSetNodeID &ID) const {
437 ID.AddInteger(getOffset());
439 ID.AddPointer(getValue());
440 ID.AddInteger(Flags);
443 void MachineMemOperand::refineAlignment(const MachineMemOperand *MMO) {
444 // The Value and Offset may differ due to CSE. But the flags and size
445 // should be the same.
446 assert(MMO->getFlags() == getFlags() && "Flags mismatch!");
447 assert(MMO->getSize() == getSize() && "Size mismatch!");
449 if (MMO->getBaseAlignment() >= getBaseAlignment()) {
450 // Update the alignment value.
451 Flags = (Flags & ((1 << MOMaxBits) - 1)) |
452 ((Log2_32(MMO->getBaseAlignment()) + 1) << MOMaxBits);
453 // Also update the base and offset, because the new alignment may
454 // not be applicable with the old ones.
455 PtrInfo = MMO->PtrInfo;
459 /// getAlignment - Return the minimum known alignment in bytes of the
460 /// actual memory reference.
461 uint64_t MachineMemOperand::getAlignment() const {
462 return MinAlign(getBaseAlignment(), getOffset());
465 raw_ostream &llvm::operator<<(raw_ostream &OS, const MachineMemOperand &MMO) {
466 assert((MMO.isLoad() || MMO.isStore()) &&
467 "SV has to be a load, store or both.");
469 if (MMO.isVolatile())
478 // Print the address information.
483 WriteAsOperand(OS, MMO.getValue(), /*PrintType=*/false);
485 // If the alignment of the memory reference itself differs from the alignment
486 // of the base pointer, print the base alignment explicitly, next to the base
488 if (MMO.getBaseAlignment() != MMO.getAlignment())
489 OS << "(align=" << MMO.getBaseAlignment() << ")";
491 if (MMO.getOffset() != 0)
492 OS << "+" << MMO.getOffset();
495 // Print the alignment of the reference.
496 if (MMO.getBaseAlignment() != MMO.getAlignment() ||
497 MMO.getBaseAlignment() != MMO.getSize())
498 OS << "(align=" << MMO.getAlignment() << ")";
501 if (const MDNode *TBAAInfo = MMO.getTBAAInfo()) {
503 if (TBAAInfo->getNumOperands() > 0)
504 WriteAsOperand(OS, TBAAInfo->getOperand(0), /*PrintType=*/false);
510 // Print nontemporal info.
511 if (MMO.isNonTemporal())
512 OS << "(nontemporal)";
517 //===----------------------------------------------------------------------===//
518 // MachineInstr Implementation
519 //===----------------------------------------------------------------------===//
521 /// MachineInstr ctor - This constructor creates a dummy MachineInstr with
522 /// MCID NULL and no operands.
523 MachineInstr::MachineInstr()
524 : MCID(0), Flags(0), AsmPrinterFlags(0),
525 NumMemRefs(0), MemRefs(0),
527 // Make sure that we get added to a machine basicblock
528 LeakDetector::addGarbageObject(this);
531 void MachineInstr::addImplicitDefUseOperands() {
532 if (MCID->ImplicitDefs)
533 for (const uint16_t *ImpDefs = MCID->getImplicitDefs(); *ImpDefs; ++ImpDefs)
534 addOperand(MachineOperand::CreateReg(*ImpDefs, true, true));
535 if (MCID->ImplicitUses)
536 for (const uint16_t *ImpUses = MCID->getImplicitUses(); *ImpUses; ++ImpUses)
537 addOperand(MachineOperand::CreateReg(*ImpUses, false, true));
540 /// MachineInstr ctor - This constructor creates a MachineInstr and adds the
541 /// implicit operands. It reserves space for the number of operands specified by
543 MachineInstr::MachineInstr(const MCInstrDesc &tid, bool NoImp)
544 : MCID(&tid), Flags(0), AsmPrinterFlags(0),
545 NumMemRefs(0), MemRefs(0), Parent(0) {
546 unsigned NumImplicitOps = 0;
548 NumImplicitOps = MCID->getNumImplicitDefs() + MCID->getNumImplicitUses();
549 Operands.reserve(NumImplicitOps + MCID->getNumOperands());
551 addImplicitDefUseOperands();
552 // Make sure that we get added to a machine basicblock
553 LeakDetector::addGarbageObject(this);
556 /// MachineInstr ctor - As above, but with a DebugLoc.
557 MachineInstr::MachineInstr(const MCInstrDesc &tid, const DebugLoc dl,
559 : MCID(&tid), Flags(0), AsmPrinterFlags(0),
560 NumMemRefs(0), MemRefs(0), Parent(0), debugLoc(dl) {
561 unsigned NumImplicitOps = 0;
563 NumImplicitOps = MCID->getNumImplicitDefs() + MCID->getNumImplicitUses();
564 Operands.reserve(NumImplicitOps + MCID->getNumOperands());
566 addImplicitDefUseOperands();
567 // Make sure that we get added to a machine basicblock
568 LeakDetector::addGarbageObject(this);
571 /// MachineInstr ctor - Work exactly the same as the ctor two above, except
572 /// that the MachineInstr is created and added to the end of the specified
574 MachineInstr::MachineInstr(MachineBasicBlock *MBB, const MCInstrDesc &tid)
575 : MCID(&tid), Flags(0), AsmPrinterFlags(0),
576 NumMemRefs(0), MemRefs(0), Parent(0) {
577 assert(MBB && "Cannot use inserting ctor with null basic block!");
578 unsigned NumImplicitOps =
579 MCID->getNumImplicitDefs() + MCID->getNumImplicitUses();
580 Operands.reserve(NumImplicitOps + MCID->getNumOperands());
581 addImplicitDefUseOperands();
582 // Make sure that we get added to a machine basicblock
583 LeakDetector::addGarbageObject(this);
584 MBB->push_back(this); // Add instruction to end of basic block!
587 /// MachineInstr ctor - As above, but with a DebugLoc.
589 MachineInstr::MachineInstr(MachineBasicBlock *MBB, const DebugLoc dl,
590 const MCInstrDesc &tid)
591 : MCID(&tid), Flags(0), AsmPrinterFlags(0),
592 NumMemRefs(0), MemRefs(0), Parent(0), debugLoc(dl) {
593 assert(MBB && "Cannot use inserting ctor with null basic block!");
594 unsigned NumImplicitOps =
595 MCID->getNumImplicitDefs() + MCID->getNumImplicitUses();
596 Operands.reserve(NumImplicitOps + MCID->getNumOperands());
597 addImplicitDefUseOperands();
598 // Make sure that we get added to a machine basicblock
599 LeakDetector::addGarbageObject(this);
600 MBB->push_back(this); // Add instruction to end of basic block!
603 /// MachineInstr ctor - Copies MachineInstr arg exactly
605 MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI)
606 : MCID(&MI.getDesc()), Flags(0), AsmPrinterFlags(0),
607 NumMemRefs(MI.NumMemRefs), MemRefs(MI.MemRefs),
608 Parent(0), debugLoc(MI.getDebugLoc()) {
609 Operands.reserve(MI.getNumOperands());
612 for (unsigned i = 0; i != MI.getNumOperands(); ++i)
613 addOperand(MI.getOperand(i));
615 // Copy all the flags.
618 // Set parent to null.
621 LeakDetector::addGarbageObject(this);
624 MachineInstr::~MachineInstr() {
625 LeakDetector::removeGarbageObject(this);
627 for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
628 assert(Operands[i].ParentMI == this && "ParentMI mismatch!");
629 assert((!Operands[i].isReg() || !Operands[i].isOnRegUseList()) &&
630 "Reg operand def/use list corrupted");
635 /// getRegInfo - If this instruction is embedded into a MachineFunction,
636 /// return the MachineRegisterInfo object for the current function, otherwise
638 MachineRegisterInfo *MachineInstr::getRegInfo() {
639 if (MachineBasicBlock *MBB = getParent())
640 return &MBB->getParent()->getRegInfo();
644 /// RemoveRegOperandsFromUseLists - Unlink all of the register operands in
645 /// this instruction from their respective use lists. This requires that the
646 /// operands already be on their use lists.
647 void MachineInstr::RemoveRegOperandsFromUseLists(MachineRegisterInfo &MRI) {
648 for (unsigned i = 0, e = Operands.size(); i != e; ++i)
649 if (Operands[i].isReg())
650 MRI.removeRegOperandFromUseList(&Operands[i]);
653 /// AddRegOperandsToUseLists - Add all of the register operands in
654 /// this instruction from their respective use lists. This requires that the
655 /// operands not be on their use lists yet.
656 void MachineInstr::AddRegOperandsToUseLists(MachineRegisterInfo &MRI) {
657 for (unsigned i = 0, e = Operands.size(); i != e; ++i)
658 if (Operands[i].isReg())
659 MRI.addRegOperandToUseList(&Operands[i]);
662 /// addOperand - Add the specified operand to the instruction. If it is an
663 /// implicit operand, it is added to the end of the operand list. If it is
664 /// an explicit operand it is added at the end of the explicit operand list
665 /// (before the first implicit operand).
666 void MachineInstr::addOperand(const MachineOperand &Op) {
667 assert(MCID && "Cannot add operands before providing an instr descriptor");
668 bool isImpReg = Op.isReg() && Op.isImplicit();
669 MachineRegisterInfo *RegInfo = getRegInfo();
671 // If the Operands backing store is reallocated, all register operands must
672 // be removed and re-added to RegInfo. It is storing pointers to operands.
673 bool Reallocate = RegInfo &&
674 !Operands.empty() && Operands.size() == Operands.capacity();
676 // Find the insert location for the new operand. Implicit registers go at
677 // the end, everything goes before the implicit regs.
678 unsigned OpNo = Operands.size();
680 // Remove all the implicit operands from RegInfo if they need to be shifted.
681 // FIXME: Allow mixed explicit and implicit operands on inline asm.
682 // InstrEmitter::EmitSpecialNode() is marking inline asm clobbers as
683 // implicit-defs, but they must not be moved around. See the FIXME in
685 if (!isImpReg && !isInlineAsm()) {
686 while (OpNo && Operands[OpNo-1].isReg() && Operands[OpNo-1].isImplicit()) {
688 assert(!Operands[OpNo].isTied() && "Cannot move tied operands");
690 RegInfo->removeRegOperandFromUseList(&Operands[OpNo]);
694 // OpNo now points as the desired insertion point. Unless this is a variadic
695 // instruction, only implicit regs are allowed beyond MCID->getNumOperands().
696 // RegMask operands go between the explicit and implicit operands.
697 assert((isImpReg || Op.isRegMask() || MCID->isVariadic() ||
698 OpNo < MCID->getNumOperands()) &&
699 "Trying to add an operand to a machine instr that is already done!");
701 // All operands from OpNo have been removed from RegInfo. If the Operands
702 // backing store needs to be reallocated, we also need to remove any other
703 // register operands.
705 for (unsigned i = 0; i != OpNo; ++i)
706 if (Operands[i].isReg())
707 RegInfo->removeRegOperandFromUseList(&Operands[i]);
709 // Insert the new operand at OpNo.
710 Operands.insert(Operands.begin() + OpNo, Op);
711 Operands[OpNo].ParentMI = this;
713 // The Operands backing store has now been reallocated, so we can re-add the
714 // operands before OpNo.
716 for (unsigned i = 0; i != OpNo; ++i)
717 if (Operands[i].isReg())
718 RegInfo->addRegOperandToUseList(&Operands[i]);
720 // When adding a register operand, tell RegInfo about it.
721 if (Operands[OpNo].isReg()) {
722 // Ensure isOnRegUseList() returns false, regardless of Op's status.
723 Operands[OpNo].Contents.Reg.Prev = 0;
724 // Ignore existing ties. This is not a property that can be copied.
725 Operands[OpNo].TiedTo = 0;
726 // Add the new operand to RegInfo.
728 RegInfo->addRegOperandToUseList(&Operands[OpNo]);
729 // The MCID operand information isn't accurate until we start adding
730 // explicit operands. The implicit operands are added first, then the
731 // explicits are inserted before them.
733 // Tie uses to defs as indicated in MCInstrDesc.
734 if (Operands[OpNo].isUse()) {
735 int DefIdx = MCID->getOperandConstraint(OpNo, MCOI::TIED_TO);
737 tieOperands(DefIdx, OpNo);
739 // If the register operand is flagged as early, mark the operand as such.
740 if (MCID->getOperandConstraint(OpNo, MCOI::EARLY_CLOBBER) != -1)
741 Operands[OpNo].setIsEarlyClobber(true);
745 // Re-add all the implicit ops.
747 for (unsigned i = OpNo + 1, e = Operands.size(); i != e; ++i) {
748 assert(Operands[i].isReg() && "Should only be an implicit reg!");
749 RegInfo->addRegOperandToUseList(&Operands[i]);
754 /// RemoveOperand - Erase an operand from an instruction, leaving it with one
755 /// fewer operand than it started with.
757 void MachineInstr::RemoveOperand(unsigned OpNo) {
758 assert(OpNo < Operands.size() && "Invalid operand number");
759 untieRegOperand(OpNo);
760 MachineRegisterInfo *RegInfo = getRegInfo();
762 // Special case removing the last one.
763 if (OpNo == Operands.size()-1) {
764 // If needed, remove from the reg def/use list.
765 if (RegInfo && Operands.back().isReg() && Operands.back().isOnRegUseList())
766 RegInfo->removeRegOperandFromUseList(&Operands.back());
772 // Otherwise, we are removing an interior operand. If we have reginfo to
773 // update, remove all operands that will be shifted down from their reg lists,
774 // move everything down, then re-add them.
776 for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) {
777 if (Operands[i].isReg())
778 RegInfo->removeRegOperandFromUseList(&Operands[i]);
783 // Moving tied operands would break the ties.
784 for (unsigned i = OpNo + 1, e = Operands.size(); i != e; ++i)
785 if (Operands[i].isReg())
786 assert(!Operands[i].isTied() && "Cannot move tied operands");
789 Operands.erase(Operands.begin()+OpNo);
792 for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) {
793 if (Operands[i].isReg())
794 RegInfo->addRegOperandToUseList(&Operands[i]);
799 /// addMemOperand - Add a MachineMemOperand to the machine instruction.
800 /// This function should be used only occasionally. The setMemRefs function
801 /// is the primary method for setting up a MachineInstr's MemRefs list.
802 void MachineInstr::addMemOperand(MachineFunction &MF,
803 MachineMemOperand *MO) {
804 mmo_iterator OldMemRefs = MemRefs;
805 uint16_t OldNumMemRefs = NumMemRefs;
807 uint16_t NewNum = NumMemRefs + 1;
808 mmo_iterator NewMemRefs = MF.allocateMemRefsArray(NewNum);
810 std::copy(OldMemRefs, OldMemRefs + OldNumMemRefs, NewMemRefs);
811 NewMemRefs[NewNum - 1] = MO;
813 MemRefs = NewMemRefs;
817 bool MachineInstr::hasPropertyInBundle(unsigned Mask, QueryType Type) const {
818 const MachineBasicBlock *MBB = getParent();
819 MachineBasicBlock::const_instr_iterator MII = *this; ++MII;
820 while (MII != MBB->end() && MII->isInsideBundle()) {
821 if (MII->getDesc().getFlags() & Mask) {
822 if (Type == AnyInBundle)
825 if (Type == AllInBundle)
831 return Type == AllInBundle;
834 bool MachineInstr::isIdenticalTo(const MachineInstr *Other,
835 MICheckType Check) const {
836 // If opcodes or number of operands are not the same then the two
837 // instructions are obviously not identical.
838 if (Other->getOpcode() != getOpcode() ||
839 Other->getNumOperands() != getNumOperands())
843 // Both instructions are bundles, compare MIs inside the bundle.
844 MachineBasicBlock::const_instr_iterator I1 = *this;
845 MachineBasicBlock::const_instr_iterator E1 = getParent()->instr_end();
846 MachineBasicBlock::const_instr_iterator I2 = *Other;
847 MachineBasicBlock::const_instr_iterator E2= Other->getParent()->instr_end();
848 while (++I1 != E1 && I1->isInsideBundle()) {
850 if (I2 == E2 || !I2->isInsideBundle() || !I1->isIdenticalTo(I2, Check))
855 // Check operands to make sure they match.
856 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
857 const MachineOperand &MO = getOperand(i);
858 const MachineOperand &OMO = Other->getOperand(i);
860 if (!MO.isIdenticalTo(OMO))
865 // Clients may or may not want to ignore defs when testing for equality.
866 // For example, machine CSE pass only cares about finding common
867 // subexpressions, so it's safe to ignore virtual register defs.
869 if (Check == IgnoreDefs)
871 else if (Check == IgnoreVRegDefs) {
872 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) ||
873 TargetRegisterInfo::isPhysicalRegister(OMO.getReg()))
874 if (MO.getReg() != OMO.getReg())
877 if (!MO.isIdenticalTo(OMO))
879 if (Check == CheckKillDead && MO.isDead() != OMO.isDead())
883 if (!MO.isIdenticalTo(OMO))
885 if (Check == CheckKillDead && MO.isKill() != OMO.isKill())
889 // If DebugLoc does not match then two dbg.values are not identical.
891 if (!getDebugLoc().isUnknown() && !Other->getDebugLoc().isUnknown()
892 && getDebugLoc() != Other->getDebugLoc())
897 /// removeFromParent - This method unlinks 'this' from the containing basic
898 /// block, and returns it, but does not delete it.
899 MachineInstr *MachineInstr::removeFromParent() {
900 assert(getParent() && "Not embedded in a basic block!");
902 // If it's a bundle then remove the MIs inside the bundle as well.
904 MachineBasicBlock *MBB = getParent();
905 MachineBasicBlock::instr_iterator MII = *this; ++MII;
906 MachineBasicBlock::instr_iterator E = MBB->instr_end();
907 while (MII != E && MII->isInsideBundle()) {
908 MachineInstr *MI = &*MII;
913 getParent()->remove(this);
918 /// eraseFromParent - This method unlinks 'this' from the containing basic
919 /// block, and deletes it.
920 void MachineInstr::eraseFromParent() {
921 assert(getParent() && "Not embedded in a basic block!");
922 // If it's a bundle then remove the MIs inside the bundle as well.
924 MachineBasicBlock *MBB = getParent();
925 MachineBasicBlock::instr_iterator MII = *this; ++MII;
926 MachineBasicBlock::instr_iterator E = MBB->instr_end();
927 while (MII != E && MII->isInsideBundle()) {
928 MachineInstr *MI = &*MII;
933 // Erase the individual instruction, which may itself be inside a bundle.
934 getParent()->erase_instr(this);
938 /// getNumExplicitOperands - Returns the number of non-implicit operands.
940 unsigned MachineInstr::getNumExplicitOperands() const {
941 unsigned NumOperands = MCID->getNumOperands();
942 if (!MCID->isVariadic())
945 for (unsigned i = NumOperands, e = getNumOperands(); i != e; ++i) {
946 const MachineOperand &MO = getOperand(i);
947 if (!MO.isReg() || !MO.isImplicit())
953 /// isBundled - Return true if this instruction part of a bundle. This is true
954 /// if either itself or its following instruction is marked "InsideBundle".
955 bool MachineInstr::isBundled() const {
956 if (isInsideBundle())
958 MachineBasicBlock::const_instr_iterator nextMI = this;
960 return nextMI != Parent->instr_end() && nextMI->isInsideBundle();
963 bool MachineInstr::isStackAligningInlineAsm() const {
965 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
966 if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
972 InlineAsm::AsmDialect MachineInstr::getInlineAsmDialect() const {
973 assert(isInlineAsm() && "getInlineAsmDialect() only works for inline asms!");
974 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
975 return InlineAsm::AsmDialect((ExtraInfo & InlineAsm::Extra_AsmDialect) != 0);
978 int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx,
979 unsigned *GroupNo) const {
980 assert(isInlineAsm() && "Expected an inline asm instruction");
981 assert(OpIdx < getNumOperands() && "OpIdx out of range");
983 // Ignore queries about the initial operands.
984 if (OpIdx < InlineAsm::MIOp_FirstOperand)
989 for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
991 const MachineOperand &FlagMO = getOperand(i);
992 // If we reach the implicit register operands, stop looking.
995 NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
996 if (i + NumOps > OpIdx) {
1006 const TargetRegisterClass*
1007 MachineInstr::getRegClassConstraint(unsigned OpIdx,
1008 const TargetInstrInfo *TII,
1009 const TargetRegisterInfo *TRI) const {
1010 assert(getParent() && "Can't have an MBB reference here!");
1011 assert(getParent()->getParent() && "Can't have an MF reference here!");
1012 const MachineFunction &MF = *getParent()->getParent();
1014 // Most opcodes have fixed constraints in their MCInstrDesc.
1016 return TII->getRegClass(getDesc(), OpIdx, TRI, MF);
1018 if (!getOperand(OpIdx).isReg())
1021 // For tied uses on inline asm, get the constraint from the def.
1023 if (getOperand(OpIdx).isUse() && isRegTiedToDefOperand(OpIdx, &DefIdx))
1026 // Inline asm stores register class constraints in the flag word.
1027 int FlagIdx = findInlineAsmFlagIdx(OpIdx);
1031 unsigned Flag = getOperand(FlagIdx).getImm();
1033 if (InlineAsm::hasRegClassConstraint(Flag, RCID))
1034 return TRI->getRegClass(RCID);
1036 // Assume that all registers in a memory operand are pointers.
1037 if (InlineAsm::getKind(Flag) == InlineAsm::Kind_Mem)
1038 return TRI->getPointerRegClass(MF);
1043 /// getBundleSize - Return the number of instructions inside the MI bundle.
1044 unsigned MachineInstr::getBundleSize() const {
1045 assert(isBundle() && "Expecting a bundle");
1047 MachineBasicBlock::const_instr_iterator I = *this;
1049 while ((++I)->isInsideBundle()) {
1052 assert(Size > 1 && "Malformed bundle");
1057 /// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of
1058 /// the specific register or -1 if it is not found. It further tightens
1059 /// the search criteria to a use that kills the register if isKill is true.
1060 int MachineInstr::findRegisterUseOperandIdx(unsigned Reg, bool isKill,
1061 const TargetRegisterInfo *TRI) const {
1062 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1063 const MachineOperand &MO = getOperand(i);
1064 if (!MO.isReg() || !MO.isUse())
1066 unsigned MOReg = MO.getReg();
1071 TargetRegisterInfo::isPhysicalRegister(MOReg) &&
1072 TargetRegisterInfo::isPhysicalRegister(Reg) &&
1073 TRI->isSubRegister(MOReg, Reg)))
1074 if (!isKill || MO.isKill())
1080 /// readsWritesVirtualRegister - Return a pair of bools (reads, writes)
1081 /// indicating if this instruction reads or writes Reg. This also considers
1082 /// partial defines.
1083 std::pair<bool,bool>
1084 MachineInstr::readsWritesVirtualRegister(unsigned Reg,
1085 SmallVectorImpl<unsigned> *Ops) const {
1086 bool PartDef = false; // Partial redefine.
1087 bool FullDef = false; // Full define.
1090 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1091 const MachineOperand &MO = getOperand(i);
1092 if (!MO.isReg() || MO.getReg() != Reg)
1097 Use |= !MO.isUndef();
1098 else if (MO.getSubReg() && !MO.isUndef())
1099 // A partial <def,undef> doesn't count as reading the register.
1104 // A partial redefine uses Reg unless there is also a full define.
1105 return std::make_pair(Use || (PartDef && !FullDef), PartDef || FullDef);
1108 /// findRegisterDefOperandIdx() - Returns the operand index that is a def of
1109 /// the specified register or -1 if it is not found. If isDead is true, defs
1110 /// that are not dead are skipped. If TargetRegisterInfo is non-null, then it
1111 /// also checks if there is a def of a super-register.
1113 MachineInstr::findRegisterDefOperandIdx(unsigned Reg, bool isDead, bool Overlap,
1114 const TargetRegisterInfo *TRI) const {
1115 bool isPhys = TargetRegisterInfo::isPhysicalRegister(Reg);
1116 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1117 const MachineOperand &MO = getOperand(i);
1118 // Accept regmask operands when Overlap is set.
1119 // Ignore them when looking for a specific def operand (Overlap == false).
1120 if (isPhys && Overlap && MO.isRegMask() && MO.clobbersPhysReg(Reg))
1122 if (!MO.isReg() || !MO.isDef())
1124 unsigned MOReg = MO.getReg();
1125 bool Found = (MOReg == Reg);
1126 if (!Found && TRI && isPhys &&
1127 TargetRegisterInfo::isPhysicalRegister(MOReg)) {
1129 Found = TRI->regsOverlap(MOReg, Reg);
1131 Found = TRI->isSubRegister(MOReg, Reg);
1133 if (Found && (!isDead || MO.isDead()))
1139 /// findFirstPredOperandIdx() - Find the index of the first operand in the
1140 /// operand list that is used to represent the predicate. It returns -1 if
1142 int MachineInstr::findFirstPredOperandIdx() const {
1143 // Don't call MCID.findFirstPredOperandIdx() because this variant
1144 // is sometimes called on an instruction that's not yet complete, and
1145 // so the number of operands is less than the MCID indicates. In
1146 // particular, the PTX target does this.
1147 const MCInstrDesc &MCID = getDesc();
1148 if (MCID.isPredicable()) {
1149 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1150 if (MCID.OpInfo[i].isPredicate())
1157 // MachineOperand::TiedTo is 4 bits wide.
1158 const unsigned TiedMax = 15;
1160 /// tieOperands - Mark operands at DefIdx and UseIdx as tied to each other.
1162 /// Use and def operands can be tied together, indicated by a non-zero TiedTo
1163 /// field. TiedTo can have these values:
1165 /// 0: Operand is not tied to anything.
1166 /// 1 to TiedMax-1: Tied to getOperand(TiedTo-1).
1167 /// TiedMax: Tied to an operand >= TiedMax-1.
1169 /// The tied def must be one of the first TiedMax operands on a normal
1170 /// instruction. INLINEASM instructions allow more tied defs.
1172 void MachineInstr::tieOperands(unsigned DefIdx, unsigned UseIdx) {
1173 MachineOperand &DefMO = getOperand(DefIdx);
1174 MachineOperand &UseMO = getOperand(UseIdx);
1175 assert(DefMO.isDef() && "DefIdx must be a def operand");
1176 assert(UseMO.isUse() && "UseIdx must be a use operand");
1177 assert(!DefMO.isTied() && "Def is already tied to another use");
1178 assert(!UseMO.isTied() && "Use is already tied to another def");
1180 if (DefIdx < TiedMax)
1181 UseMO.TiedTo = DefIdx + 1;
1183 // Inline asm can use the group descriptors to find tied operands, but on
1184 // normal instruction, the tied def must be within the first TiedMax
1186 assert(isInlineAsm() && "DefIdx out of range");
1187 UseMO.TiedTo = TiedMax;
1190 // UseIdx can be out of range, we'll search for it in findTiedOperandIdx().
1191 DefMO.TiedTo = std::min(UseIdx + 1, TiedMax);
1194 /// Given the index of a tied register operand, find the operand it is tied to.
1195 /// Defs are tied to uses and vice versa. Returns the index of the tied operand
1196 /// which must exist.
1197 unsigned MachineInstr::findTiedOperandIdx(unsigned OpIdx) const {
1198 const MachineOperand &MO = getOperand(OpIdx);
1199 assert(MO.isTied() && "Operand isn't tied");
1201 // Normally TiedTo is in range.
1202 if (MO.TiedTo < TiedMax)
1203 return MO.TiedTo - 1;
1205 // Uses on normal instructions can be out of range.
1206 if (!isInlineAsm()) {
1207 // Normal tied defs must be in the 0..TiedMax-1 range.
1210 // MO is a def. Search for the tied use.
1211 for (unsigned i = TiedMax - 1, e = getNumOperands(); i != e; ++i) {
1212 const MachineOperand &UseMO = getOperand(i);
1213 if (UseMO.isReg() && UseMO.isUse() && UseMO.TiedTo == OpIdx + 1)
1216 llvm_unreachable("Can't find tied use");
1219 // Now deal with inline asm by parsing the operand group descriptor flags.
1220 // Find the beginning of each operand group.
1221 SmallVector<unsigned, 8> GroupIdx;
1222 unsigned OpIdxGroup = ~0u;
1224 for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
1226 const MachineOperand &FlagMO = getOperand(i);
1227 assert(FlagMO.isImm() && "Invalid tied operand on inline asm");
1228 unsigned CurGroup = GroupIdx.size();
1229 GroupIdx.push_back(i);
1230 NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
1231 // OpIdx belongs to this operand group.
1232 if (OpIdx > i && OpIdx < i + NumOps)
1233 OpIdxGroup = CurGroup;
1235 if (!InlineAsm::isUseOperandTiedToDef(FlagMO.getImm(), TiedGroup))
1237 // Operands in this group are tied to operands in TiedGroup which must be
1238 // earlier. Find the number of operands between the two groups.
1239 unsigned Delta = i - GroupIdx[TiedGroup];
1241 // OpIdx is a use tied to TiedGroup.
1242 if (OpIdxGroup == CurGroup)
1243 return OpIdx - Delta;
1245 // OpIdx is a def tied to this use group.
1246 if (OpIdxGroup == TiedGroup)
1247 return OpIdx + Delta;
1249 llvm_unreachable("Invalid tied operand on inline asm");
1252 /// clearKillInfo - Clears kill flags on all operands.
1254 void MachineInstr::clearKillInfo() {
1255 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1256 MachineOperand &MO = getOperand(i);
1257 if (MO.isReg() && MO.isUse())
1258 MO.setIsKill(false);
1262 /// copyKillDeadInfo - Copies kill / dead operand properties from MI.
1264 void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) {
1265 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
1266 const MachineOperand &MO = MI->getOperand(i);
1267 if (!MO.isReg() || (!MO.isKill() && !MO.isDead()))
1269 for (unsigned j = 0, ee = getNumOperands(); j != ee; ++j) {
1270 MachineOperand &MOp = getOperand(j);
1271 if (!MOp.isIdenticalTo(MO))
1282 /// copyPredicates - Copies predicate operand(s) from MI.
1283 void MachineInstr::copyPredicates(const MachineInstr *MI) {
1284 assert(!isBundle() && "MachineInstr::copyPredicates() can't handle bundles");
1286 const MCInstrDesc &MCID = MI->getDesc();
1287 if (!MCID.isPredicable())
1289 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
1290 if (MCID.OpInfo[i].isPredicate()) {
1291 // Predicated operands must be last operands.
1292 addOperand(MI->getOperand(i));
1297 void MachineInstr::substituteRegister(unsigned FromReg,
1300 const TargetRegisterInfo &RegInfo) {
1301 if (TargetRegisterInfo::isPhysicalRegister(ToReg)) {
1303 ToReg = RegInfo.getSubReg(ToReg, SubIdx);
1304 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1305 MachineOperand &MO = getOperand(i);
1306 if (!MO.isReg() || MO.getReg() != FromReg)
1308 MO.substPhysReg(ToReg, RegInfo);
1311 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1312 MachineOperand &MO = getOperand(i);
1313 if (!MO.isReg() || MO.getReg() != FromReg)
1315 MO.substVirtReg(ToReg, SubIdx, RegInfo);
1320 /// isSafeToMove - Return true if it is safe to move this instruction. If
1321 /// SawStore is set to true, it means that there is a store (or call) between
1322 /// the instruction's location and its intended destination.
1323 bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII,
1325 bool &SawStore) const {
1326 // Ignore stuff that we obviously can't move.
1328 // Treat volatile loads as stores. This is not strictly necessary for
1329 // volatiles, but it is required for atomic loads. It is not allowed to move
1330 // a load across an atomic load with Ordering > Monotonic.
1331 if (mayStore() || isCall() ||
1332 (mayLoad() && hasOrderedMemoryRef())) {
1337 if (isLabel() || isDebugValue() ||
1338 isTerminator() || hasUnmodeledSideEffects())
1341 // See if this instruction does a load. If so, we have to guarantee that the
1342 // loaded value doesn't change between the load and the its intended
1343 // destination. The check for isInvariantLoad gives the targe the chance to
1344 // classify the load as always returning a constant, e.g. a constant pool
1346 if (mayLoad() && !isInvariantLoad(AA))
1347 // Otherwise, this is a real load. If there is a store between the load and
1348 // end of block, we can't move it.
1354 /// isSafeToReMat - Return true if it's safe to rematerialize the specified
1355 /// instruction which defined the specified register instead of copying it.
1356 bool MachineInstr::isSafeToReMat(const TargetInstrInfo *TII,
1358 unsigned DstReg) const {
1359 bool SawStore = false;
1360 if (!TII->isTriviallyReMaterializable(this, AA) ||
1361 !isSafeToMove(TII, AA, SawStore))
1363 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1364 const MachineOperand &MO = getOperand(i);
1367 // FIXME: For now, do not remat any instruction with register operands.
1368 // Later on, we can loosen the restriction is the register operands have
1369 // not been modified between the def and use. Note, this is different from
1370 // MachineSink because the code is no longer in two-address form (at least
1374 else if (!MO.isDead() && MO.getReg() != DstReg)
1380 /// hasOrderedMemoryRef - Return true if this instruction may have an ordered
1381 /// or volatile memory reference, or if the information describing the memory
1382 /// reference is not available. Return false if it is known to have no ordered
1383 /// memory references.
1384 bool MachineInstr::hasOrderedMemoryRef() const {
1385 // An instruction known never to access memory won't have a volatile access.
1389 !hasUnmodeledSideEffects())
1392 // Otherwise, if the instruction has no memory reference information,
1393 // conservatively assume it wasn't preserved.
1394 if (memoperands_empty())
1397 // Check the memory reference information for ordered references.
1398 for (mmo_iterator I = memoperands_begin(), E = memoperands_end(); I != E; ++I)
1399 if (!(*I)->isUnordered())
1405 /// isInvariantLoad - Return true if this instruction is loading from a
1406 /// location whose value is invariant across the function. For example,
1407 /// loading a value from the constant pool or from the argument area
1408 /// of a function if it does not change. This should only return true of
1409 /// *all* loads the instruction does are invariant (if it does multiple loads).
1410 bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const {
1411 // If the instruction doesn't load at all, it isn't an invariant load.
1415 // If the instruction has lost its memoperands, conservatively assume that
1416 // it may not be an invariant load.
1417 if (memoperands_empty())
1420 const MachineFrameInfo *MFI = getParent()->getParent()->getFrameInfo();
1422 for (mmo_iterator I = memoperands_begin(),
1423 E = memoperands_end(); I != E; ++I) {
1424 if ((*I)->isVolatile()) return false;
1425 if ((*I)->isStore()) return false;
1426 if ((*I)->isInvariant()) return true;
1428 if (const Value *V = (*I)->getValue()) {
1429 // A load from a constant PseudoSourceValue is invariant.
1430 if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V))
1431 if (PSV->isConstant(MFI))
1433 // If we have an AliasAnalysis, ask it whether the memory is constant.
1434 if (AA && AA->pointsToConstantMemory(
1435 AliasAnalysis::Location(V, (*I)->getSize(),
1436 (*I)->getTBAAInfo())))
1440 // Otherwise assume conservatively.
1444 // Everything checks out.
1448 /// isConstantValuePHI - If the specified instruction is a PHI that always
1449 /// merges together the same virtual register, return the register, otherwise
1451 unsigned MachineInstr::isConstantValuePHI() const {
1454 assert(getNumOperands() >= 3 &&
1455 "It's illegal to have a PHI without source operands");
1457 unsigned Reg = getOperand(1).getReg();
1458 for (unsigned i = 3, e = getNumOperands(); i < e; i += 2)
1459 if (getOperand(i).getReg() != Reg)
1464 bool MachineInstr::hasUnmodeledSideEffects() const {
1465 if (hasProperty(MCID::UnmodeledSideEffects))
1467 if (isInlineAsm()) {
1468 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
1469 if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
1476 /// allDefsAreDead - Return true if all the defs of this instruction are dead.
1478 bool MachineInstr::allDefsAreDead() const {
1479 for (unsigned i = 0, e = getNumOperands(); i < e; ++i) {
1480 const MachineOperand &MO = getOperand(i);
1481 if (!MO.isReg() || MO.isUse())
1489 /// copyImplicitOps - Copy implicit register operands from specified
1490 /// instruction to this instruction.
1491 void MachineInstr::copyImplicitOps(const MachineInstr *MI) {
1492 for (unsigned i = MI->getDesc().getNumOperands(), e = MI->getNumOperands();
1494 const MachineOperand &MO = MI->getOperand(i);
1495 if (MO.isReg() && MO.isImplicit())
1500 void MachineInstr::dump() const {
1501 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
1502 dbgs() << " " << *this;
1506 static void printDebugLoc(DebugLoc DL, const MachineFunction *MF,
1507 raw_ostream &CommentOS) {
1508 const LLVMContext &Ctx = MF->getFunction()->getContext();
1509 if (!DL.isUnknown()) { // Print source line info.
1510 DIScope Scope(DL.getScope(Ctx));
1511 // Omit the directory, because it's likely to be long and uninteresting.
1513 CommentOS << Scope.getFilename();
1515 CommentOS << "<unknown>";
1516 CommentOS << ':' << DL.getLine();
1517 if (DL.getCol() != 0)
1518 CommentOS << ':' << DL.getCol();
1519 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(DL.getInlinedAt(Ctx));
1520 if (!InlinedAtDL.isUnknown()) {
1521 CommentOS << " @[ ";
1522 printDebugLoc(InlinedAtDL, MF, CommentOS);
1528 void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const {
1529 // We can be a bit tidier if we know the TargetMachine and/or MachineFunction.
1530 const MachineFunction *MF = 0;
1531 const MachineRegisterInfo *MRI = 0;
1532 if (const MachineBasicBlock *MBB = getParent()) {
1533 MF = MBB->getParent();
1535 TM = &MF->getTarget();
1537 MRI = &MF->getRegInfo();
1540 // Save a list of virtual registers.
1541 SmallVector<unsigned, 8> VirtRegs;
1543 // Print explicitly defined operands on the left of an assignment syntax.
1544 unsigned StartOp = 0, e = getNumOperands();
1545 for (; StartOp < e && getOperand(StartOp).isReg() &&
1546 getOperand(StartOp).isDef() &&
1547 !getOperand(StartOp).isImplicit();
1549 if (StartOp != 0) OS << ", ";
1550 getOperand(StartOp).print(OS, TM);
1551 unsigned Reg = getOperand(StartOp).getReg();
1552 if (TargetRegisterInfo::isVirtualRegister(Reg))
1553 VirtRegs.push_back(Reg);
1559 // Print the opcode name.
1560 if (TM && TM->getInstrInfo())
1561 OS << TM->getInstrInfo()->getName(getOpcode());
1565 // Print the rest of the operands.
1566 bool OmittedAnyCallClobbers = false;
1567 bool FirstOp = true;
1568 unsigned AsmDescOp = ~0u;
1569 unsigned AsmOpCount = 0;
1571 if (isInlineAsm() && e >= InlineAsm::MIOp_FirstOperand) {
1572 // Print asm string.
1574 getOperand(InlineAsm::MIOp_AsmString).print(OS, TM);
1576 // Print HasSideEffects, IsAlignStack
1577 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
1578 if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
1579 OS << " [sideeffect]";
1580 if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
1581 OS << " [alignstack]";
1582 if (getInlineAsmDialect() == InlineAsm::AD_ATT)
1583 OS << " [attdialect]";
1584 if (getInlineAsmDialect() == InlineAsm::AD_Intel)
1585 OS << " [inteldialect]";
1587 StartOp = AsmDescOp = InlineAsm::MIOp_FirstOperand;
1592 for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
1593 const MachineOperand &MO = getOperand(i);
1595 if (MO.isReg() && TargetRegisterInfo::isVirtualRegister(MO.getReg()))
1596 VirtRegs.push_back(MO.getReg());
1598 // Omit call-clobbered registers which aren't used anywhere. This makes
1599 // call instructions much less noisy on targets where calls clobber lots
1600 // of registers. Don't rely on MO.isDead() because we may be called before
1601 // LiveVariables is run, or we may be looking at a non-allocatable reg.
1602 if (MF && isCall() &&
1603 MO.isReg() && MO.isImplicit() && MO.isDef()) {
1604 unsigned Reg = MO.getReg();
1605 if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
1606 const MachineRegisterInfo &MRI = MF->getRegInfo();
1607 if (MRI.use_empty(Reg) && !MRI.isLiveOut(Reg)) {
1608 bool HasAliasLive = false;
1609 for (MCRegAliasIterator AI(Reg, TM->getRegisterInfo(), true);
1610 AI.isValid(); ++AI) {
1611 unsigned AliasReg = *AI;
1612 if (!MRI.use_empty(AliasReg) || MRI.isLiveOut(AliasReg)) {
1613 HasAliasLive = true;
1617 if (!HasAliasLive) {
1618 OmittedAnyCallClobbers = true;
1625 if (FirstOp) FirstOp = false; else OS << ",";
1627 if (i < getDesc().NumOperands) {
1628 const MCOperandInfo &MCOI = getDesc().OpInfo[i];
1629 if (MCOI.isPredicate())
1631 if (MCOI.isOptionalDef())
1634 if (isDebugValue() && MO.isMetadata()) {
1635 // Pretty print DBG_VALUE instructions.
1636 const MDNode *MD = MO.getMetadata();
1637 if (const MDString *MDS = dyn_cast<MDString>(MD->getOperand(2)))
1638 OS << "!\"" << MDS->getString() << '\"';
1641 } else if (TM && (isInsertSubreg() || isRegSequence()) && MO.isImm()) {
1642 OS << TM->getRegisterInfo()->getSubRegIndexName(MO.getImm());
1643 } else if (i == AsmDescOp && MO.isImm()) {
1644 // Pretty print the inline asm operand descriptor.
1645 OS << '$' << AsmOpCount++;
1646 unsigned Flag = MO.getImm();
1647 switch (InlineAsm::getKind(Flag)) {
1648 case InlineAsm::Kind_RegUse: OS << ":[reguse"; break;
1649 case InlineAsm::Kind_RegDef: OS << ":[regdef"; break;
1650 case InlineAsm::Kind_RegDefEarlyClobber: OS << ":[regdef-ec"; break;
1651 case InlineAsm::Kind_Clobber: OS << ":[clobber"; break;
1652 case InlineAsm::Kind_Imm: OS << ":[imm"; break;
1653 case InlineAsm::Kind_Mem: OS << ":[mem"; break;
1654 default: OS << ":[??" << InlineAsm::getKind(Flag); break;
1658 if (InlineAsm::hasRegClassConstraint(Flag, RCID)) {
1660 OS << ':' << TM->getRegisterInfo()->getRegClass(RCID)->getName();
1662 OS << ":RC" << RCID;
1665 unsigned TiedTo = 0;
1666 if (InlineAsm::isUseOperandTiedToDef(Flag, TiedTo))
1667 OS << " tiedto:$" << TiedTo;
1671 // Compute the index of the next operand descriptor.
1672 AsmDescOp += 1 + InlineAsm::getNumOperandRegisters(Flag);
1677 // Briefly indicate whether any call clobbers were omitted.
1678 if (OmittedAnyCallClobbers) {
1679 if (!FirstOp) OS << ",";
1683 bool HaveSemi = false;
1685 if (!HaveSemi) OS << ";"; HaveSemi = true;
1688 if (Flags & FrameSetup)
1692 if (!memoperands_empty()) {
1693 if (!HaveSemi) OS << ";"; HaveSemi = true;
1696 for (mmo_iterator i = memoperands_begin(), e = memoperands_end();
1699 if (llvm::next(i) != e)
1704 // Print the regclass of any virtual registers encountered.
1705 if (MRI && !VirtRegs.empty()) {
1706 if (!HaveSemi) OS << ";"; HaveSemi = true;
1707 for (unsigned i = 0; i != VirtRegs.size(); ++i) {
1708 const TargetRegisterClass *RC = MRI->getRegClass(VirtRegs[i]);
1709 OS << " " << RC->getName() << ':' << PrintReg(VirtRegs[i]);
1710 for (unsigned j = i+1; j != VirtRegs.size();) {
1711 if (MRI->getRegClass(VirtRegs[j]) != RC) {
1715 if (VirtRegs[i] != VirtRegs[j])
1716 OS << "," << PrintReg(VirtRegs[j]);
1717 VirtRegs.erase(VirtRegs.begin()+j);
1722 // Print debug location information.
1723 if (isDebugValue() && getOperand(e - 1).isMetadata()) {
1724 if (!HaveSemi) OS << ";"; HaveSemi = true;
1725 DIVariable DV(getOperand(e - 1).getMetadata());
1726 OS << " line no:" << DV.getLineNumber();
1727 if (MDNode *InlinedAt = DV.getInlinedAt()) {
1728 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(InlinedAt);
1729 if (!InlinedAtDL.isUnknown()) {
1730 OS << " inlined @[ ";
1731 printDebugLoc(InlinedAtDL, MF, OS);
1735 } else if (!debugLoc.isUnknown() && MF) {
1736 if (!HaveSemi) OS << ";"; HaveSemi = true;
1738 printDebugLoc(debugLoc, MF, OS);
1744 bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
1745 const TargetRegisterInfo *RegInfo,
1746 bool AddIfNotFound) {
1747 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
1748 bool hasAliases = isPhysReg &&
1749 MCRegAliasIterator(IncomingReg, RegInfo, false).isValid();
1751 SmallVector<unsigned,4> DeadOps;
1752 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1753 MachineOperand &MO = getOperand(i);
1754 if (!MO.isReg() || !MO.isUse() || MO.isUndef())
1756 unsigned Reg = MO.getReg();
1760 if (Reg == IncomingReg) {
1763 // The register is already marked kill.
1765 if (isPhysReg && isRegTiedToDefOperand(i))
1766 // Two-address uses of physregs must not be marked kill.
1771 } else if (hasAliases && MO.isKill() &&
1772 TargetRegisterInfo::isPhysicalRegister(Reg)) {
1773 // A super-register kill already exists.
1774 if (RegInfo->isSuperRegister(IncomingReg, Reg))
1776 if (RegInfo->isSubRegister(IncomingReg, Reg))
1777 DeadOps.push_back(i);
1781 // Trim unneeded kill operands.
1782 while (!DeadOps.empty()) {
1783 unsigned OpIdx = DeadOps.back();
1784 if (getOperand(OpIdx).isImplicit())
1785 RemoveOperand(OpIdx);
1787 getOperand(OpIdx).setIsKill(false);
1791 // If not found, this means an alias of one of the operands is killed. Add a
1792 // new implicit operand if required.
1793 if (!Found && AddIfNotFound) {
1794 addOperand(MachineOperand::CreateReg(IncomingReg,
1803 void MachineInstr::clearRegisterKills(unsigned Reg,
1804 const TargetRegisterInfo *RegInfo) {
1805 if (!TargetRegisterInfo::isPhysicalRegister(Reg))
1807 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1808 MachineOperand &MO = getOperand(i);
1809 if (!MO.isReg() || !MO.isUse() || !MO.isKill())
1811 unsigned OpReg = MO.getReg();
1812 if (OpReg == Reg || (RegInfo && RegInfo->isSuperRegister(Reg, OpReg)))
1813 MO.setIsKill(false);
1817 bool MachineInstr::addRegisterDead(unsigned IncomingReg,
1818 const TargetRegisterInfo *RegInfo,
1819 bool AddIfNotFound) {
1820 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
1821 bool hasAliases = isPhysReg &&
1822 MCRegAliasIterator(IncomingReg, RegInfo, false).isValid();
1824 SmallVector<unsigned,4> DeadOps;
1825 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1826 MachineOperand &MO = getOperand(i);
1827 if (!MO.isReg() || !MO.isDef())
1829 unsigned Reg = MO.getReg();
1833 if (Reg == IncomingReg) {
1836 } else if (hasAliases && MO.isDead() &&
1837 TargetRegisterInfo::isPhysicalRegister(Reg)) {
1838 // There exists a super-register that's marked dead.
1839 if (RegInfo->isSuperRegister(IncomingReg, Reg))
1841 if (RegInfo->isSubRegister(IncomingReg, Reg))
1842 DeadOps.push_back(i);
1846 // Trim unneeded dead operands.
1847 while (!DeadOps.empty()) {
1848 unsigned OpIdx = DeadOps.back();
1849 if (getOperand(OpIdx).isImplicit())
1850 RemoveOperand(OpIdx);
1852 getOperand(OpIdx).setIsDead(false);
1856 // If not found, this means an alias of one of the operands is dead. Add a
1857 // new implicit operand if required.
1858 if (Found || !AddIfNotFound)
1861 addOperand(MachineOperand::CreateReg(IncomingReg,
1869 void MachineInstr::addRegisterDefined(unsigned IncomingReg,
1870 const TargetRegisterInfo *RegInfo) {
1871 if (TargetRegisterInfo::isPhysicalRegister(IncomingReg)) {
1872 MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo);
1876 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1877 const MachineOperand &MO = getOperand(i);
1878 if (MO.isReg() && MO.getReg() == IncomingReg && MO.isDef() &&
1879 MO.getSubReg() == 0)
1883 addOperand(MachineOperand::CreateReg(IncomingReg,
1888 void MachineInstr::setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs,
1889 const TargetRegisterInfo &TRI) {
1890 bool HasRegMask = false;
1891 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1892 MachineOperand &MO = getOperand(i);
1893 if (MO.isRegMask()) {
1897 if (!MO.isReg() || !MO.isDef()) continue;
1898 unsigned Reg = MO.getReg();
1899 if (!TargetRegisterInfo::isPhysicalRegister(Reg)) continue;
1901 for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
1903 if (TRI.regsOverlap(*I, Reg)) {
1907 // If there are no uses, including partial uses, the def is dead.
1908 if (Dead) MO.setIsDead();
1911 // This is a call with a register mask operand.
1912 // Mask clobbers are always dead, so add defs for the non-dead defines.
1914 for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
1916 addRegisterDefined(*I, &TRI);
1920 MachineInstrExpressionTrait::getHashValue(const MachineInstr* const &MI) {
1921 // Build up a buffer of hash code components.
1922 SmallVector<size_t, 8> HashComponents;
1923 HashComponents.reserve(MI->getNumOperands() + 1);
1924 HashComponents.push_back(MI->getOpcode());
1925 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
1926 const MachineOperand &MO = MI->getOperand(i);
1927 if (MO.isReg() && MO.isDef() &&
1928 TargetRegisterInfo::isVirtualRegister(MO.getReg()))
1929 continue; // Skip virtual register defs.
1931 HashComponents.push_back(hash_value(MO));
1933 return hash_combine_range(HashComponents.begin(), HashComponents.end());
1936 void MachineInstr::emitError(StringRef Msg) const {
1937 // Find the source location cookie.
1938 unsigned LocCookie = 0;
1939 const MDNode *LocMD = 0;
1940 for (unsigned i = getNumOperands(); i != 0; --i) {
1941 if (getOperand(i-1).isMetadata() &&
1942 (LocMD = getOperand(i-1).getMetadata()) &&
1943 LocMD->getNumOperands() != 0) {
1944 if (const ConstantInt *CI = dyn_cast<ConstantInt>(LocMD->getOperand(0))) {
1945 LocCookie = CI->getZExtValue();
1951 if (const MachineBasicBlock *MBB = getParent())
1952 if (const MachineFunction *MF = MBB->getParent())
1953 return MF->getMMI().getModule()->getContext().emitError(LocCookie, Msg);
1954 report_fatal_error(Msg);