1 //===-- lib/CodeGen/MachineInstr.cpp --------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // Methods common to all machine instructions.
11 //
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"
43 using namespace llvm;
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
54 // use/def lists.
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);
62 return;
63 }
65 // Otherwise, just change the register, no problem. :)
66 SmallContents.RegNo = Reg;
67 }
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());
74 setReg(Reg);
75 if (SubIdx)
76 setSubReg(SubIdx);
77 }
79 void MachineOperand::substPhysReg(unsigned Reg, const TargetRegisterInfo &TRI) {
80 assert(TargetRegisterInfo::isPhysicalRegister(Reg));
81 if (getSubReg()) {
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.
85 setSubReg(0);
86 }
87 setReg(Reg);
88 }
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");
94 if (IsDef == Val)
95 return;
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);
102 IsDef = Val;
103 MRI.addRegOperandToUseList(this);
104 return;
105 }
106 IsDef = Val;
107 }
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;
124 }
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,
131 bool isDebug) {
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;
147 IsDef = isDef;
148 IsImp = isImp;
149 IsKill = isKill;
150 IsDead = isDead;
151 IsUndef = isUndef;
152 IsInternalRead = false;
153 IsEarlyClobber = false;
154 IsDebug = isDebug;
155 // Ensure isOnRegUseList() returns false.
156 Contents.Reg.Prev = 0;
157 // Preserve the tie when the operand was already a register.
158 if (!WasReg)
159 TiedTo = 0;
161 // If this operand is embedded in a function, add the operand to the
162 // register's use/def list.
163 if (RegInfo)
164 RegInfo->addRegOperandToUseList(this);
165 }
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
169 /// below.
170 bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const {
171 if (getType() != Other.getType() ||
172 getTargetFlags() != Other.getTargetFlags())
173 return false;
175 switch (getType()) {
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();
208 }
209 llvm_unreachable("Invalid machine operand type");
210 }
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(),
231 MO.getOffset());
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(),
236 MO.getSymbolName());
237 case MachineOperand::MO_GlobalAddress:
238 return hash_combine(MO.getType(), MO.getTargetFlags(), MO.getGlobal(),
239 MO.getOffset());
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());
249 }
250 llvm_unreachable("Invalid machine operand type");
251 }
253 /// print - Print the specified machine operand.
254 ///
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.
258 if (!TM)
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;
265 switch (getType()) {
266 case MachineOperand::MO_Register:
267 OS << PrintReg(getReg(), TRI, getSubReg());
269 if (isDef() || isKill() || isDead() || isImplicit() || isUndef() ||
270 isInternalRead() || isEarlyClobber() || isTied()) {
271 OS << '<';
272 bool NeedComma = false;
273 if (isDef()) {
274 if (NeedComma) OS << ',';
275 if (isEarlyClobber())
276 OS << "earlyclobber,";
277 if (isImplicit())
278 OS << "imp-";
279 OS << "def";
280 NeedComma = true;
281 // <def,read-undef> only makes sense when getSubReg() is set.
282 // Don't clutter the output otherwise.
283 if (isUndef() && getSubReg())
284 OS << ",read-undef";
285 } else if (isImplicit()) {
286 OS << "imp-use";
287 NeedComma = true;
288 }
290 if (isKill()) {
291 if (NeedComma) OS << ',';
292 OS << "kill";
293 NeedComma = true;
294 }
295 if (isDead()) {
296 if (NeedComma) OS << ',';
297 OS << "dead";
298 NeedComma = true;
299 }
300 if (isUndef() && isUse()) {
301 if (NeedComma) OS << ',';
302 OS << "undef";
303 NeedComma = true;
304 }
305 if (isInternalRead()) {
306 if (NeedComma) OS << ',';
307 OS << "internal";
308 NeedComma = true;
309 }
310 if (isTied()) {
311 if (NeedComma) OS << ',';
312 OS << "tied";
313 if (TiedTo != 15)
314 OS << unsigned(TiedTo - 1);
315 NeedComma = true;
316 }
317 OS << '>';
318 }
319 break;
320 case MachineOperand::MO_Immediate:
321 OS << getImm();
322 break;
323 case MachineOperand::MO_CImmediate:
324 getCImm()->getValue().print(OS, false);
325 break;
326 case MachineOperand::MO_FPImmediate:
327 if (getFPImm()->getType()->isFloatTy())
328 OS << getFPImm()->getValueAPF().convertToFloat();
329 else
330 OS << getFPImm()->getValueAPF().convertToDouble();
331 break;
332 case MachineOperand::MO_MachineBasicBlock:
333 OS << "<BB#" << getMBB()->getNumber() << ">";
334 break;
335 case MachineOperand::MO_FrameIndex:
336 OS << "<fi#" << getIndex() << '>';
337 break;
338 case MachineOperand::MO_ConstantPoolIndex:
339 OS << "<cp#" << getIndex();
340 if (getOffset()) OS << "+" << getOffset();
341 OS << '>';
342 break;
343 case MachineOperand::MO_TargetIndex:
344 OS << "<ti#" << getIndex();
345 if (getOffset()) OS << "+" << getOffset();
346 OS << '>';
347 break;
348 case MachineOperand::MO_JumpTableIndex:
349 OS << "<jt#" << getIndex() << '>';
350 break;
351 case MachineOperand::MO_GlobalAddress:
352 OS << "<ga:";
353 WriteAsOperand(OS, getGlobal(), /*PrintType=*/false);
354 if (getOffset()) OS << "+" << getOffset();
355 OS << '>';
356 break;
357 case MachineOperand::MO_ExternalSymbol:
358 OS << "<es:" << getSymbolName();
359 if (getOffset()) OS << "+" << getOffset();
360 OS << '>';
361 break;
362 case MachineOperand::MO_BlockAddress:
363 OS << '<';
364 WriteAsOperand(OS, getBlockAddress(), /*PrintType=*/false);
365 if (getOffset()) OS << "+" << getOffset();
366 OS << '>';
367 break;
368 case MachineOperand::MO_RegisterMask:
369 OS << "<regmask>";
370 break;
371 case MachineOperand::MO_Metadata:
372 OS << '<';
373 WriteAsOperand(OS, getMetadata(), /*PrintType=*/false);
374 OS << '>';
375 break;
376 case MachineOperand::MO_MCSymbol:
377 OS << "<MCSym=" << *getMCSymbol() << '>';
378 break;
379 }
381 if (unsigned TF = getTargetFlags())
382 OS << "[TF=" << TF << ']';
383 }
385 //===----------------------------------------------------------------------===//
386 // MachineMemOperand Implementation
387 //===----------------------------------------------------------------------===//
389 /// getAddrSpace - Return the LLVM IR address space number that this pointer
390 /// points into.
391 unsigned MachinePointerInfo::getAddrSpace() const {
392 if (V == 0) return 0;
393 return cast<PointerType>(V->getType())->getAddressSpace();
394 }
396 /// getConstantPool - Return a MachinePointerInfo record that refers to the
397 /// constant pool.
398 MachinePointerInfo MachinePointerInfo::getConstantPool() {
399 return MachinePointerInfo(PseudoSourceValue::getConstantPool());
400 }
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);
406 }
408 MachinePointerInfo MachinePointerInfo::getJumpTable() {
409 return MachinePointerInfo(PseudoSourceValue::getJumpTable());
410 }
412 MachinePointerInfo MachinePointerInfo::getGOT() {
413 return MachinePointerInfo(PseudoSourceValue::getGOT());
414 }
416 MachinePointerInfo MachinePointerInfo::getStack(int64_t Offset) {
417 return MachinePointerInfo(PseudoSourceValue::getStack(), Offset);
418 }
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!");
431 }
433 /// Profile - Gather unique data for the object.
434 ///
435 void MachineMemOperand::Profile(FoldingSetNodeID &ID) const {
436 ID.AddInteger(getOffset());
437 ID.AddInteger(Size);
438 ID.AddPointer(getValue());
439 ID.AddInteger(Flags);
440 }
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;
455 }
456 }
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());
462 }
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())
469 OS << "Volatile ";
471 if (MMO.isLoad())
472 OS << "LD";
473 if (MMO.isStore())
474 OS << "ST";
475 OS << MMO.getSize();
477 // Print the address information.
478 OS << "[";
479 if (!MMO.getValue())
480 OS << "<unknown>";
481 else
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
486 // pointer.
487 if (MMO.getBaseAlignment() != MMO.getAlignment())
488 OS << "(align=" << MMO.getBaseAlignment() << ")";
490 if (MMO.getOffset() != 0)
491 OS << "+" << MMO.getOffset();
492 OS << "]";
494 // Print the alignment of the reference.
495 if (MMO.getBaseAlignment() != MMO.getAlignment() ||
496 MMO.getBaseAlignment() != MMO.getSize())
497 OS << "(align=" << MMO.getAlignment() << ")";
499 // Print TBAA info.
500 if (const MDNode *TBAAInfo = MMO.getTBAAInfo()) {
501 OS << "(tbaa=";
502 if (TBAAInfo->getNumOperands() > 0)
503 WriteAsOperand(OS, TBAAInfo->getOperand(0), /*PrintType=*/false);
504 else
505 OS << "<unknown>";
506 OS << ")";
507 }
509 // Print nontemporal info.
510 if (MMO.isNonTemporal())
511 OS << "(nontemporal)";
513 return OS;
514 }
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));
527 }
529 /// MachineInstr ctor - This constructor creates a MachineInstr and adds the
530 /// implicit operands. It reserves space for the number of operands specified by
531 /// the MCInstrDesc.
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);
542 }
544 if (!NoImp)
545 addImplicitDefUseOperands(MF);
546 }
548 /// MachineInstr ctor - Copies MachineInstr arg exactly
549 ///
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);
558 // Copy operands.
559 for (unsigned i = 0; i != MI.getNumOperands(); ++i)
560 addOperand(MF, MI.getOperand(i));
562 // Copy all the sensible flags.
563 setFlags(MI.Flags);
564 }
566 /// getRegInfo - If this instruction is embedded into a MachineFunction,
567 /// return the MachineRegisterInfo object for the current function, otherwise
568 /// return null.
569 MachineRegisterInfo *MachineInstr::getRegInfo() {
570 if (MachineBasicBlock *MBB = getParent())
571 return &MBB->getParent()->getRegInfo();
572 return 0;
573 }
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]);
582 }
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]);
591 }
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");
598 addOperand(*MF, Op);
599 }
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) {
605 if (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.
610 if (Dst < Src)
611 for (unsigned i = 0; i != NumOps; ++i)
612 new (Dst + i) MachineOperand(Src[i]);
613 else
614 for (unsigned i = NumOps; i ; --i)
615 new (Dst + i - 1) MachineOperand(Src[i - 1]);
616 }
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);
632 }
634 // Find the insert location for the new operand. Implicit registers go at
635 // the end, everything else goes before the implicit regs.
636 //
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
640 // InstrEmitter.cpp.
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()) {
645 --OpNo;
646 assert(!Operands[OpNo].isTied() && "Cannot move tied operands");
647 }
648 }
650 #ifndef NDEBUG
651 bool isMetaDataOp = Op.getType() == MachineOperand::MO_Metadata;
652 // OpNo now points as the desired insertion point. Unless this is a variadic
653 // instruction, only implicit regs are allowed beyond MCID->getNumOperands().
654 // RegMask operands go between the explicit and implicit operands.
655 assert((isImpReg || Op.isRegMask() || MCID->isVariadic() ||
656 OpNo < MCID->getNumOperands() || isMetaDataOp) &&
657 "Trying to add an operand to a machine instr that is already done!");
658 #endif
660 MachineRegisterInfo *MRI = getRegInfo();
662 // Determine if the Operands array needs to be reallocated.
663 // Save the old capacity and operand array.
664 OperandCapacity OldCap = CapOperands;
665 MachineOperand *OldOperands = Operands;
666 if (!OldOperands || OldCap.getSize() == getNumOperands()) {
667 CapOperands = OldOperands ? OldCap.getNext() : OldCap.get(1);
668 Operands = MF.allocateOperandArray(CapOperands);
669 // Move the operands before the insertion point.
670 if (OpNo)
671 moveOperands(Operands, OldOperands, OpNo, MRI);
672 }
674 // Move the operands following the insertion point.
675 if (OpNo != NumOperands)
676 moveOperands(Operands + OpNo + 1, OldOperands + OpNo, NumOperands - OpNo,
677 MRI);
678 ++NumOperands;
680 // Deallocate the old operand array.
681 if (OldOperands != Operands && OldOperands)
682 MF.deallocateOperandArray(OldCap, OldOperands);
684 // Copy Op into place. It still needs to be inserted into the MRI use lists.
685 MachineOperand *NewMO = new (Operands + OpNo) MachineOperand(Op);
686 NewMO->ParentMI = this;
688 // When adding a register operand, tell MRI about it.
689 if (NewMO->isReg()) {
690 // Ensure isOnRegUseList() returns false, regardless of Op's status.
691 NewMO->Contents.Reg.Prev = 0;
692 // Ignore existing ties. This is not a property that can be copied.
693 NewMO->TiedTo = 0;
694 // Add the new operand to MRI, but only for instructions in an MBB.
695 if (MRI)
696 MRI->addRegOperandToUseList(NewMO);
697 // The MCID operand information isn't accurate until we start adding
698 // explicit operands. The implicit operands are added first, then the
699 // explicits are inserted before them.
700 if (!isImpReg) {
701 // Tie uses to defs as indicated in MCInstrDesc.
702 if (NewMO->isUse()) {
703 int DefIdx = MCID->getOperandConstraint(OpNo, MCOI::TIED_TO);
704 if (DefIdx != -1)
705 tieOperands(DefIdx, OpNo);
706 }
707 // If the register operand is flagged as early, mark the operand as such.
708 if (MCID->getOperandConstraint(OpNo, MCOI::EARLY_CLOBBER) != -1)
709 NewMO->setIsEarlyClobber(true);
710 }
711 }
712 }
714 /// RemoveOperand - Erase an operand from an instruction, leaving it with one
715 /// fewer operand than it started with.
716 ///
717 void MachineInstr::RemoveOperand(unsigned OpNo) {
718 assert(OpNo < getNumOperands() && "Invalid operand number");
719 untieRegOperand(OpNo);
721 #ifndef NDEBUG
722 // Moving tied operands would break the ties.
723 for (unsigned i = OpNo + 1, e = getNumOperands(); i != e; ++i)
724 if (Operands[i].isReg())
725 assert(!Operands[i].isTied() && "Cannot move tied operands");
726 #endif
728 MachineRegisterInfo *MRI = getRegInfo();
729 if (MRI && Operands[OpNo].isReg())
730 MRI->removeRegOperandFromUseList(Operands + OpNo);
732 // Don't call the MachineOperand destructor. A lot of this code depends on
733 // MachineOperand having a trivial destructor anyway, and adding a call here
734 // wouldn't make it 'destructor-correct'.
736 if (unsigned N = NumOperands - 1 - OpNo)
737 moveOperands(Operands + OpNo, Operands + OpNo + 1, N, MRI);
738 --NumOperands;
739 }
741 /// addMemOperand - Add a MachineMemOperand to the machine instruction.
742 /// This function should be used only occasionally. The setMemRefs function
743 /// is the primary method for setting up a MachineInstr's MemRefs list.
744 void MachineInstr::addMemOperand(MachineFunction &MF,
745 MachineMemOperand *MO) {
746 mmo_iterator OldMemRefs = MemRefs;
747 unsigned OldNumMemRefs = NumMemRefs;
749 unsigned NewNum = NumMemRefs + 1;
750 mmo_iterator NewMemRefs = MF.allocateMemRefsArray(NewNum);
752 std::copy(OldMemRefs, OldMemRefs + OldNumMemRefs, NewMemRefs);
753 NewMemRefs[NewNum - 1] = MO;
754 setMemRefs(NewMemRefs, NewMemRefs + NewNum);
755 }
757 bool MachineInstr::hasPropertyInBundle(unsigned Mask, QueryType Type) const {
758 assert(!isBundledWithPred() && "Must be called on bundle header");
759 for (MachineBasicBlock::const_instr_iterator MII = this;; ++MII) {
760 if (MII->getDesc().getFlags() & Mask) {
761 if (Type == AnyInBundle)
762 return true;
763 } else {
764 if (Type == AllInBundle && !MII->isBundle())
765 return false;
766 }
767 // This was the last instruction in the bundle.
768 if (!MII->isBundledWithSucc())
769 return Type == AllInBundle;
770 }
771 }
773 bool MachineInstr::isIdenticalTo(const MachineInstr *Other,
774 MICheckType Check) const {
775 // If opcodes or number of operands are not the same then the two
776 // instructions are obviously not identical.
777 if (Other->getOpcode() != getOpcode() ||
778 Other->getNumOperands() != getNumOperands())
779 return false;
781 if (isBundle()) {
782 // Both instructions are bundles, compare MIs inside the bundle.
783 MachineBasicBlock::const_instr_iterator I1 = *this;
784 MachineBasicBlock::const_instr_iterator E1 = getParent()->instr_end();
785 MachineBasicBlock::const_instr_iterator I2 = *Other;
786 MachineBasicBlock::const_instr_iterator E2= Other->getParent()->instr_end();
787 while (++I1 != E1 && I1->isInsideBundle()) {
788 ++I2;
789 if (I2 == E2 || !I2->isInsideBundle() || !I1->isIdenticalTo(I2, Check))
790 return false;
791 }
792 }
794 // Check operands to make sure they match.
795 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
796 const MachineOperand &MO = getOperand(i);
797 const MachineOperand &OMO = Other->getOperand(i);
798 if (!MO.isReg()) {
799 if (!MO.isIdenticalTo(OMO))
800 return false;
801 continue;
802 }
804 // Clients may or may not want to ignore defs when testing for equality.
805 // For example, machine CSE pass only cares about finding common
806 // subexpressions, so it's safe to ignore virtual register defs.
807 if (MO.isDef()) {
808 if (Check == IgnoreDefs)
809 continue;
810 else if (Check == IgnoreVRegDefs) {
811 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) ||
812 TargetRegisterInfo::isPhysicalRegister(OMO.getReg()))
813 if (MO.getReg() != OMO.getReg())
814 return false;
815 } else {
816 if (!MO.isIdenticalTo(OMO))
817 return false;
818 if (Check == CheckKillDead && MO.isDead() != OMO.isDead())
819 return false;
820 }
821 } else {
822 if (!MO.isIdenticalTo(OMO))
823 return false;
824 if (Check == CheckKillDead && MO.isKill() != OMO.isKill())
825 return false;
826 }
827 }
828 // If DebugLoc does not match then two dbg.values are not identical.
829 if (isDebugValue())
830 if (!getDebugLoc().isUnknown() && !Other->getDebugLoc().isUnknown()
831 && getDebugLoc() != Other->getDebugLoc())
832 return false;
833 return true;
834 }
836 MachineInstr *MachineInstr::removeFromParent() {
837 assert(getParent() && "Not embedded in a basic block!");
838 return getParent()->remove(this);
839 }
841 MachineInstr *MachineInstr::removeFromBundle() {
842 assert(getParent() && "Not embedded in a basic block!");
843 return getParent()->remove_instr(this);
844 }
846 void MachineInstr::eraseFromParent() {
847 assert(getParent() && "Not embedded in a basic block!");
848 getParent()->erase(this);
849 }
851 void MachineInstr::eraseFromBundle() {
852 assert(getParent() && "Not embedded in a basic block!");
853 getParent()->erase_instr(this);
854 }
856 /// getNumExplicitOperands - Returns the number of non-implicit operands.
857 ///
858 unsigned MachineInstr::getNumExplicitOperands() const {
859 unsigned NumOperands = MCID->getNumOperands();
860 if (!MCID->isVariadic())
861 return NumOperands;
863 for (unsigned i = NumOperands, e = getNumOperands(); i != e; ++i) {
864 const MachineOperand &MO = getOperand(i);
865 if (!MO.isReg() || !MO.isImplicit())
866 NumOperands++;
867 }
868 return NumOperands;
869 }
871 void MachineInstr::bundleWithPred() {
872 assert(!isBundledWithPred() && "MI is already bundled with its predecessor");
873 setFlag(BundledPred);
874 MachineBasicBlock::instr_iterator Pred = this;
875 --Pred;
876 assert(!Pred->isBundledWithSucc() && "Inconsistent bundle flags");
877 Pred->setFlag(BundledSucc);
878 }
880 void MachineInstr::bundleWithSucc() {
881 assert(!isBundledWithSucc() && "MI is already bundled with its successor");
882 setFlag(BundledSucc);
883 MachineBasicBlock::instr_iterator Succ = this;
884 ++Succ;
885 assert(!Succ->isBundledWithPred() && "Inconsistent bundle flags");
886 Succ->setFlag(BundledPred);
887 }
889 void MachineInstr::unbundleFromPred() {
890 assert(isBundledWithPred() && "MI isn't bundled with its predecessor");
891 clearFlag(BundledPred);
892 MachineBasicBlock::instr_iterator Pred = this;
893 --Pred;
894 assert(Pred->isBundledWithSucc() && "Inconsistent bundle flags");
895 Pred->clearFlag(BundledSucc);
896 }
898 void MachineInstr::unbundleFromSucc() {
899 assert(isBundledWithSucc() && "MI isn't bundled with its successor");
900 clearFlag(BundledSucc);
901 MachineBasicBlock::instr_iterator Succ = this;
902 ++Succ;
903 assert(Succ->isBundledWithPred() && "Inconsistent bundle flags");
904 Succ->clearFlag(BundledPred);
905 }
907 bool MachineInstr::isStackAligningInlineAsm() const {
908 if (isInlineAsm()) {
909 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
910 if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
911 return true;
912 }
913 return false;
914 }
916 InlineAsm::AsmDialect MachineInstr::getInlineAsmDialect() const {
917 assert(isInlineAsm() && "getInlineAsmDialect() only works for inline asms!");
918 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
919 return InlineAsm::AsmDialect((ExtraInfo & InlineAsm::Extra_AsmDialect) != 0);
920 }
922 int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx,
923 unsigned *GroupNo) const {
924 assert(isInlineAsm() && "Expected an inline asm instruction");
925 assert(OpIdx < getNumOperands() && "OpIdx out of range");
927 // Ignore queries about the initial operands.
928 if (OpIdx < InlineAsm::MIOp_FirstOperand)
929 return -1;
931 unsigned Group = 0;
932 unsigned NumOps;
933 for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
934 i += NumOps) {
935 const MachineOperand &FlagMO = getOperand(i);
936 // If we reach the implicit register operands, stop looking.
937 if (!FlagMO.isImm())
938 return -1;
939 NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
940 if (i + NumOps > OpIdx) {
941 if (GroupNo)
942 *GroupNo = Group;
943 return i;
944 }
945 ++Group;
946 }
947 return -1;
948 }
950 const TargetRegisterClass*
951 MachineInstr::getRegClassConstraint(unsigned OpIdx,
952 const TargetInstrInfo *TII,
953 const TargetRegisterInfo *TRI) const {
954 assert(getParent() && "Can't have an MBB reference here!");
955 assert(getParent()->getParent() && "Can't have an MF reference here!");
956 const MachineFunction &MF = *getParent()->getParent();
958 // Most opcodes have fixed constraints in their MCInstrDesc.
959 if (!isInlineAsm())
960 return TII->getRegClass(getDesc(), OpIdx, TRI, MF);
962 if (!getOperand(OpIdx).isReg())
963 return NULL;
965 // For tied uses on inline asm, get the constraint from the def.
966 unsigned DefIdx;
967 if (getOperand(OpIdx).isUse() && isRegTiedToDefOperand(OpIdx, &DefIdx))
968 OpIdx = DefIdx;
970 // Inline asm stores register class constraints in the flag word.
971 int FlagIdx = findInlineAsmFlagIdx(OpIdx);
972 if (FlagIdx < 0)
973 return NULL;
975 unsigned Flag = getOperand(FlagIdx).getImm();
976 unsigned RCID;
977 if (InlineAsm::hasRegClassConstraint(Flag, RCID))
978 return TRI->getRegClass(RCID);
980 // Assume that all registers in a memory operand are pointers.
981 if (InlineAsm::getKind(Flag) == InlineAsm::Kind_Mem)
982 return TRI->getPointerRegClass(MF);
984 return NULL;
985 }
987 /// Return the number of instructions inside the MI bundle, not counting the
988 /// header instruction.
989 unsigned MachineInstr::getBundleSize() const {
990 MachineBasicBlock::const_instr_iterator I = this;
991 unsigned Size = 0;
992 while (I->isBundledWithSucc())
993 ++Size, ++I;
994 return Size;
995 }
997 /// findRegisterUseOperandIdx() - Returns the MachineOperand that is a use of
998 /// the specific register or -1 if it is not found. It further tightens
999 /// the search criteria to a use that kills the register if isKill is true.
1000 int MachineInstr::findRegisterUseOperandIdx(unsigned Reg, bool isKill,
1001 const TargetRegisterInfo *TRI) const {
1002 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1003 const MachineOperand &MO = getOperand(i);
1004 if (!MO.isReg() || !MO.isUse())
1005 continue;
1006 unsigned MOReg = MO.getReg();
1007 if (!MOReg)
1008 continue;
1009 if (MOReg == Reg ||
1010 (TRI &&
1011 TargetRegisterInfo::isPhysicalRegister(MOReg) &&
1012 TargetRegisterInfo::isPhysicalRegister(Reg) &&
1013 TRI->isSubRegister(MOReg, Reg)))
1014 if (!isKill || MO.isKill())
1015 return i;
1016 }
1017 return -1;
1018 }
1020 /// readsWritesVirtualRegister - Return a pair of bools (reads, writes)
1021 /// indicating if this instruction reads or writes Reg. This also considers
1022 /// partial defines.
1023 std::pair<bool,bool>
1024 MachineInstr::readsWritesVirtualRegister(unsigned Reg,
1025 SmallVectorImpl<unsigned> *Ops) const {
1026 bool PartDef = false; // Partial redefine.
1027 bool FullDef = false; // Full define.
1028 bool Use = false;
1030 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1031 const MachineOperand &MO = getOperand(i);
1032 if (!MO.isReg() || MO.getReg() != Reg)
1033 continue;
1034 if (Ops)
1035 Ops->push_back(i);
1036 if (MO.isUse())
1037 Use |= !MO.isUndef();
1038 else if (MO.getSubReg() && !MO.isUndef())
1039 // A partial <def,undef> doesn't count as reading the register.
1040 PartDef = true;
1041 else
1042 FullDef = true;
1043 }
1044 // A partial redefine uses Reg unless there is also a full define.
1045 return std::make_pair(Use || (PartDef && !FullDef), PartDef || FullDef);
1046 }
1048 /// findRegisterDefOperandIdx() - Returns the operand index that is a def of
1049 /// the specified register or -1 if it is not found. If isDead is true, defs
1050 /// that are not dead are skipped. If TargetRegisterInfo is non-null, then it
1051 /// also checks if there is a def of a super-register.
1052 int
1053 MachineInstr::findRegisterDefOperandIdx(unsigned Reg, bool isDead, bool Overlap,
1054 const TargetRegisterInfo *TRI) const {
1055 bool isPhys = TargetRegisterInfo::isPhysicalRegister(Reg);
1056 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1057 const MachineOperand &MO = getOperand(i);
1058 // Accept regmask operands when Overlap is set.
1059 // Ignore them when looking for a specific def operand (Overlap == false).
1060 if (isPhys && Overlap && MO.isRegMask() && MO.clobbersPhysReg(Reg))
1061 return i;
1062 if (!MO.isReg() || !MO.isDef())
1063 continue;
1064 unsigned MOReg = MO.getReg();
1065 bool Found = (MOReg == Reg);
1066 if (!Found && TRI && isPhys &&
1067 TargetRegisterInfo::isPhysicalRegister(MOReg)) {
1068 if (Overlap)
1069 Found = TRI->regsOverlap(MOReg, Reg);
1070 else
1071 Found = TRI->isSubRegister(MOReg, Reg);
1072 }
1073 if (Found && (!isDead || MO.isDead()))
1074 return i;
1075 }
1076 return -1;
1077 }
1079 /// findFirstPredOperandIdx() - Find the index of the first operand in the
1080 /// operand list that is used to represent the predicate. It returns -1 if
1081 /// none is found.
1082 int MachineInstr::findFirstPredOperandIdx() const {
1083 // Don't call MCID.findFirstPredOperandIdx() because this variant
1084 // is sometimes called on an instruction that's not yet complete, and
1085 // so the number of operands is less than the MCID indicates. In
1086 // particular, the PTX target does this.
1087 const MCInstrDesc &MCID = getDesc();
1088 if (MCID.isPredicable()) {
1089 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
1090 if (MCID.OpInfo[i].isPredicate())
1091 return i;
1092 }
1094 return -1;
1095 }
1097 // MachineOperand::TiedTo is 4 bits wide.
1098 const unsigned TiedMax = 15;
1100 /// tieOperands - Mark operands at DefIdx and UseIdx as tied to each other.
1101 ///
1102 /// Use and def operands can be tied together, indicated by a non-zero TiedTo
1103 /// field. TiedTo can have these values:
1104 ///
1105 /// 0: Operand is not tied to anything.
1106 /// 1 to TiedMax-1: Tied to getOperand(TiedTo-1).
1107 /// TiedMax: Tied to an operand >= TiedMax-1.
1108 ///
1109 /// The tied def must be one of the first TiedMax operands on a normal
1110 /// instruction. INLINEASM instructions allow more tied defs.
1111 ///
1112 void MachineInstr::tieOperands(unsigned DefIdx, unsigned UseIdx) {
1113 MachineOperand &DefMO = getOperand(DefIdx);
1114 MachineOperand &UseMO = getOperand(UseIdx);
1115 assert(DefMO.isDef() && "DefIdx must be a def operand");
1116 assert(UseMO.isUse() && "UseIdx must be a use operand");
1117 assert(!DefMO.isTied() && "Def is already tied to another use");
1118 assert(!UseMO.isTied() && "Use is already tied to another def");
1120 if (DefIdx < TiedMax)
1121 UseMO.TiedTo = DefIdx + 1;
1122 else {
1123 // Inline asm can use the group descriptors to find tied operands, but on
1124 // normal instruction, the tied def must be within the first TiedMax
1125 // operands.
1126 assert(isInlineAsm() && "DefIdx out of range");
1127 UseMO.TiedTo = TiedMax;
1128 }
1130 // UseIdx can be out of range, we'll search for it in findTiedOperandIdx().
1131 DefMO.TiedTo = std::min(UseIdx + 1, TiedMax);
1132 }
1134 /// Given the index of a tied register operand, find the operand it is tied to.
1135 /// Defs are tied to uses and vice versa. Returns the index of the tied operand
1136 /// which must exist.
1137 unsigned MachineInstr::findTiedOperandIdx(unsigned OpIdx) const {
1138 const MachineOperand &MO = getOperand(OpIdx);
1139 assert(MO.isTied() && "Operand isn't tied");
1141 // Normally TiedTo is in range.
1142 if (MO.TiedTo < TiedMax)
1143 return MO.TiedTo - 1;
1145 // Uses on normal instructions can be out of range.
1146 if (!isInlineAsm()) {
1147 // Normal tied defs must be in the 0..TiedMax-1 range.
1148 if (MO.isUse())
1149 return TiedMax - 1;
1150 // MO is a def. Search for the tied use.
1151 for (unsigned i = TiedMax - 1, e = getNumOperands(); i != e; ++i) {
1152 const MachineOperand &UseMO = getOperand(i);
1153 if (UseMO.isReg() && UseMO.isUse() && UseMO.TiedTo == OpIdx + 1)
1154 return i;
1155 }
1156 llvm_unreachable("Can't find tied use");
1157 }
1159 // Now deal with inline asm by parsing the operand group descriptor flags.
1160 // Find the beginning of each operand group.
1161 SmallVector<unsigned, 8> GroupIdx;
1162 unsigned OpIdxGroup = ~0u;
1163 unsigned NumOps;
1164 for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); i < e;
1165 i += NumOps) {
1166 const MachineOperand &FlagMO = getOperand(i);
1167 assert(FlagMO.isImm() && "Invalid tied operand on inline asm");
1168 unsigned CurGroup = GroupIdx.size();
1169 GroupIdx.push_back(i);
1170 NumOps = 1 + InlineAsm::getNumOperandRegisters(FlagMO.getImm());
1171 // OpIdx belongs to this operand group.
1172 if (OpIdx > i && OpIdx < i + NumOps)
1173 OpIdxGroup = CurGroup;
1174 unsigned TiedGroup;
1175 if (!InlineAsm::isUseOperandTiedToDef(FlagMO.getImm(), TiedGroup))
1176 continue;
1177 // Operands in this group are tied to operands in TiedGroup which must be
1178 // earlier. Find the number of operands between the two groups.
1179 unsigned Delta = i - GroupIdx[TiedGroup];
1181 // OpIdx is a use tied to TiedGroup.
1182 if (OpIdxGroup == CurGroup)
1183 return OpIdx - Delta;
1185 // OpIdx is a def tied to this use group.
1186 if (OpIdxGroup == TiedGroup)
1187 return OpIdx + Delta;
1188 }
1189 llvm_unreachable("Invalid tied operand on inline asm");
1190 }
1192 /// clearKillInfo - Clears kill flags on all operands.
1193 ///
1194 void MachineInstr::clearKillInfo() {
1195 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1196 MachineOperand &MO = getOperand(i);
1197 if (MO.isReg() && MO.isUse())
1198 MO.setIsKill(false);
1199 }
1200 }
1202 void MachineInstr::substituteRegister(unsigned FromReg,
1203 unsigned ToReg,
1204 unsigned SubIdx,
1205 const TargetRegisterInfo &RegInfo) {
1206 if (TargetRegisterInfo::isPhysicalRegister(ToReg)) {
1207 if (SubIdx)
1208 ToReg = RegInfo.getSubReg(ToReg, SubIdx);
1209 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1210 MachineOperand &MO = getOperand(i);
1211 if (!MO.isReg() || MO.getReg() != FromReg)
1212 continue;
1213 MO.substPhysReg(ToReg, RegInfo);
1214 }
1215 } else {
1216 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1217 MachineOperand &MO = getOperand(i);
1218 if (!MO.isReg() || MO.getReg() != FromReg)
1219 continue;
1220 MO.substVirtReg(ToReg, SubIdx, RegInfo);
1221 }
1222 }
1223 }
1225 /// isSafeToMove - Return true if it is safe to move this instruction. If
1226 /// SawStore is set to true, it means that there is a store (or call) between
1227 /// the instruction's location and its intended destination.
1228 bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII,
1229 AliasAnalysis *AA,
1230 bool &SawStore) const {
1231 // Ignore stuff that we obviously can't move.
1232 //
1233 // Treat volatile loads as stores. This is not strictly necessary for
1234 // volatiles, but it is required for atomic loads. It is not allowed to move
1235 // a load across an atomic load with Ordering > Monotonic.
1236 if (mayStore() || isCall() ||
1237 (mayLoad() && hasOrderedMemoryRef())) {
1238 SawStore = true;
1239 return false;
1240 }
1242 if (isLabel() || isDebugValue() ||
1243 isTerminator() || hasUnmodeledSideEffects())
1244 return false;
1246 // See if this instruction does a load. If so, we have to guarantee that the
1247 // loaded value doesn't change between the load and the its intended
1248 // destination. The check for isInvariantLoad gives the targe the chance to
1249 // classify the load as always returning a constant, e.g. a constant pool
1250 // load.
1251 if (mayLoad() && !isInvariantLoad(AA))
1252 // Otherwise, this is a real load. If there is a store between the load and
1253 // end of block, we can't move it.
1254 return !SawStore;
1256 return true;
1257 }
1259 /// hasOrderedMemoryRef - Return true if this instruction may have an ordered
1260 /// or volatile memory reference, or if the information describing the memory
1261 /// reference is not available. Return false if it is known to have no ordered
1262 /// memory references.
1263 bool MachineInstr::hasOrderedMemoryRef() const {
1264 // An instruction known never to access memory won't have a volatile access.
1265 if (!mayStore() &&
1266 !mayLoad() &&
1267 !isCall() &&
1268 !hasUnmodeledSideEffects())
1269 return false;
1271 // Otherwise, if the instruction has no memory reference information,
1272 // conservatively assume it wasn't preserved.
1273 if (memoperands_empty())
1274 return true;
1276 // Check the memory reference information for ordered references.
1277 for (mmo_iterator I = memoperands_begin(), E = memoperands_end(); I != E; ++I)
1278 if (!(*I)->isUnordered())
1279 return true;
1281 return false;
1282 }
1284 /// isInvariantLoad - Return true if this instruction is loading from a
1285 /// location whose value is invariant across the function. For example,
1286 /// loading a value from the constant pool or from the argument area
1287 /// of a function if it does not change. This should only return true of
1288 /// *all* loads the instruction does are invariant (if it does multiple loads).
1289 bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const {
1290 // If the instruction doesn't load at all, it isn't an invariant load.
1291 if (!mayLoad())
1292 return false;
1294 // If the instruction has lost its memoperands, conservatively assume that
1295 // it may not be an invariant load.
1296 if (memoperands_empty())
1297 return false;
1299 const MachineFrameInfo *MFI = getParent()->getParent()->getFrameInfo();
1301 for (mmo_iterator I = memoperands_begin(),
1302 E = memoperands_end(); I != E; ++I) {
1303 if ((*I)->isVolatile()) return false;
1304 if ((*I)->isStore()) return false;
1305 if ((*I)->isInvariant()) return true;
1307 if (const Value *V = (*I)->getValue()) {
1308 // A load from a constant PseudoSourceValue is invariant.
1309 if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V))
1310 if (PSV->isConstant(MFI))
1311 continue;
1312 // If we have an AliasAnalysis, ask it whether the memory is constant.
1313 if (AA && AA->pointsToConstantMemory(
1314 AliasAnalysis::Location(V, (*I)->getSize(),
1315 (*I)->getTBAAInfo())))
1316 continue;
1317 }
1319 // Otherwise assume conservatively.
1320 return false;
1321 }
1323 // Everything checks out.
1324 return true;
1325 }
1327 /// isConstantValuePHI - If the specified instruction is a PHI that always
1328 /// merges together the same virtual register, return the register, otherwise
1329 /// return 0.
1330 unsigned MachineInstr::isConstantValuePHI() const {
1331 if (!isPHI())
1332 return 0;
1333 assert(getNumOperands() >= 3 &&
1334 "It's illegal to have a PHI without source operands");
1336 unsigned Reg = getOperand(1).getReg();
1337 for (unsigned i = 3, e = getNumOperands(); i < e; i += 2)
1338 if (getOperand(i).getReg() != Reg)
1339 return 0;
1340 return Reg;
1341 }
1343 bool MachineInstr::hasUnmodeledSideEffects() const {
1344 if (hasProperty(MCID::UnmodeledSideEffects))
1345 return true;
1346 if (isInlineAsm()) {
1347 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
1348 if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
1349 return true;
1350 }
1352 return false;
1353 }
1355 /// allDefsAreDead - Return true if all the defs of this instruction are dead.
1356 ///
1357 bool MachineInstr::allDefsAreDead() const {
1358 for (unsigned i = 0, e = getNumOperands(); i < e; ++i) {
1359 const MachineOperand &MO = getOperand(i);
1360 if (!MO.isReg() || MO.isUse())
1361 continue;
1362 if (!MO.isDead())
1363 return false;
1364 }
1365 return true;
1366 }
1368 /// copyImplicitOps - Copy implicit register operands from specified
1369 /// instruction to this instruction.
1370 void MachineInstr::copyImplicitOps(MachineFunction &MF,
1371 const MachineInstr *MI) {
1372 for (unsigned i = MI->getDesc().getNumOperands(), e = MI->getNumOperands();
1373 i != e; ++i) {
1374 const MachineOperand &MO = MI->getOperand(i);
1375 if (MO.isReg() && MO.isImplicit())
1376 addOperand(MF, MO);
1377 }
1378 }
1380 void MachineInstr::dump() const {
1381 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
1382 dbgs() << " " << *this;
1383 #endif
1384 }
1386 static void printDebugLoc(DebugLoc DL, const MachineFunction *MF,
1387 raw_ostream &CommentOS) {
1388 const LLVMContext &Ctx = MF->getFunction()->getContext();
1389 if (!DL.isUnknown()) { // Print source line info.
1390 DIScope Scope(DL.getScope(Ctx));
1391 assert((!Scope || Scope.isScope()) &&
1392 "Scope of a DebugLoc should be null or a DIScope.");
1393 // Omit the directory, because it's likely to be long and uninteresting.
1394 if (Scope)
1395 CommentOS << Scope.getFilename();
1396 else
1397 CommentOS << "<unknown>";
1398 CommentOS << ':' << DL.getLine();
1399 if (DL.getCol() != 0)
1400 CommentOS << ':' << DL.getCol();
1401 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(DL.getInlinedAt(Ctx));
1402 if (!InlinedAtDL.isUnknown()) {
1403 CommentOS << " @[ ";
1404 printDebugLoc(InlinedAtDL, MF, CommentOS);
1405 CommentOS << " ]";
1406 }
1407 }
1408 }
1410 void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM,
1411 bool SkipOpers) const {
1412 // We can be a bit tidier if we know the TargetMachine and/or MachineFunction.
1413 const MachineFunction *MF = 0;
1414 const MachineRegisterInfo *MRI = 0;
1415 if (const MachineBasicBlock *MBB = getParent()) {
1416 MF = MBB->getParent();
1417 if (!TM && MF)
1418 TM = &MF->getTarget();
1419 if (MF)
1420 MRI = &MF->getRegInfo();
1421 }
1423 // Save a list of virtual registers.
1424 SmallVector<unsigned, 8> VirtRegs;
1426 // Print explicitly defined operands on the left of an assignment syntax.
1427 unsigned StartOp = 0, e = getNumOperands();
1428 for (; StartOp < e && getOperand(StartOp).isReg() &&
1429 getOperand(StartOp).isDef() &&
1430 !getOperand(StartOp).isImplicit();
1431 ++StartOp) {
1432 if (StartOp != 0) OS << ", ";
1433 getOperand(StartOp).print(OS, TM);
1434 unsigned Reg = getOperand(StartOp).getReg();
1435 if (TargetRegisterInfo::isVirtualRegister(Reg))
1436 VirtRegs.push_back(Reg);
1437 }
1439 if (StartOp != 0)
1440 OS << " = ";
1442 // Print the opcode name.
1443 if (TM && TM->getInstrInfo())
1444 OS << TM->getInstrInfo()->getName(getOpcode());
1445 else
1446 OS << "UNKNOWN";
1448 if (SkipOpers)
1449 return;
1451 // Print the rest of the operands.
1452 bool OmittedAnyCallClobbers = false;
1453 bool FirstOp = true;
1454 unsigned AsmDescOp = ~0u;
1455 unsigned AsmOpCount = 0;
1457 if (isInlineAsm() && e >= InlineAsm::MIOp_FirstOperand) {
1458 // Print asm string.
1459 OS << " ";
1460 getOperand(InlineAsm::MIOp_AsmString).print(OS, TM);
1462 // Print HasSideEffects, MayLoad, MayStore, IsAlignStack
1463 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
1464 if (ExtraInfo & InlineAsm::Extra_HasSideEffects)
1465 OS << " [sideeffect]";
1466 if (ExtraInfo & InlineAsm::Extra_MayLoad)
1467 OS << " [mayload]";
1468 if (ExtraInfo & InlineAsm::Extra_MayStore)
1469 OS << " [maystore]";
1470 if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
1471 OS << " [alignstack]";
1472 if (getInlineAsmDialect() == InlineAsm::AD_ATT)
1473 OS << " [attdialect]";
1474 if (getInlineAsmDialect() == InlineAsm::AD_Intel)
1475 OS << " [inteldialect]";
1477 StartOp = AsmDescOp = InlineAsm::MIOp_FirstOperand;
1478 FirstOp = false;
1479 }
1482 for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) {
1483 const MachineOperand &MO = getOperand(i);
1485 if (MO.isReg() && TargetRegisterInfo::isVirtualRegister(MO.getReg()))
1486 VirtRegs.push_back(MO.getReg());
1488 // Omit call-clobbered registers which aren't used anywhere. This makes
1489 // call instructions much less noisy on targets where calls clobber lots
1490 // of registers. Don't rely on MO.isDead() because we may be called before
1491 // LiveVariables is run, or we may be looking at a non-allocatable reg.
1492 if (MF && isCall() &&
1493 MO.isReg() && MO.isImplicit() && MO.isDef()) {
1494 unsigned Reg = MO.getReg();
1495 if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
1496 const MachineRegisterInfo &MRI = MF->getRegInfo();
1497 if (MRI.use_empty(Reg)) {
1498 bool HasAliasLive = false;
1499 for (MCRegAliasIterator AI(Reg, TM->getRegisterInfo(), true);
1500 AI.isValid(); ++AI) {
1501 unsigned AliasReg = *AI;
1502 if (!MRI.use_empty(AliasReg)) {
1503 HasAliasLive = true;
1504 break;
1505 }
1506 }
1507 if (!HasAliasLive) {
1508 OmittedAnyCallClobbers = true;
1509 continue;
1510 }
1511 }
1512 }
1513 }
1515 if (FirstOp) FirstOp = false; else OS << ",";
1516 OS << " ";
1517 if (i < getDesc().NumOperands) {
1518 const MCOperandInfo &MCOI = getDesc().OpInfo[i];
1519 if (MCOI.isPredicate())
1520 OS << "pred:";
1521 if (MCOI.isOptionalDef())
1522 OS << "opt:";
1523 }
1524 if (isDebugValue() && MO.isMetadata()) {
1525 // Pretty print DBG_VALUE instructions.
1526 const MDNode *MD = MO.getMetadata();
1527 if (const MDString *MDS = dyn_cast<MDString>(MD->getOperand(2)))
1528 OS << "!\"" << MDS->getString() << '\"';
1529 else
1530 MO.print(OS, TM);
1531 } else if (TM && (isInsertSubreg() || isRegSequence()) && MO.isImm()) {
1532 OS << TM->getRegisterInfo()->getSubRegIndexName(MO.getImm());
1533 } else if (i == AsmDescOp && MO.isImm()) {
1534 // Pretty print the inline asm operand descriptor.
1535 OS << '$' << AsmOpCount++;
1536 unsigned Flag = MO.getImm();
1537 switch (InlineAsm::getKind(Flag)) {
1538 case InlineAsm::Kind_RegUse: OS << ":[reguse"; break;
1539 case InlineAsm::Kind_RegDef: OS << ":[regdef"; break;
1540 case InlineAsm::Kind_RegDefEarlyClobber: OS << ":[regdef-ec"; break;
1541 case InlineAsm::Kind_Clobber: OS << ":[clobber"; break;
1542 case InlineAsm::Kind_Imm: OS << ":[imm"; break;
1543 case InlineAsm::Kind_Mem: OS << ":[mem"; break;
1544 default: OS << ":[??" << InlineAsm::getKind(Flag); break;
1545 }
1547 unsigned RCID = 0;
1548 if (InlineAsm::hasRegClassConstraint(Flag, RCID)) {
1549 if (TM)
1550 OS << ':' << TM->getRegisterInfo()->getRegClass(RCID)->getName();
1551 else
1552 OS << ":RC" << RCID;
1553 }
1555 unsigned TiedTo = 0;
1556 if (InlineAsm::isUseOperandTiedToDef(Flag, TiedTo))
1557 OS << " tiedto:$" << TiedTo;
1559 OS << ']';
1561 // Compute the index of the next operand descriptor.
1562 AsmDescOp += 1 + InlineAsm::getNumOperandRegisters(Flag);
1563 } else
1564 MO.print(OS, TM);
1565 }
1567 // Briefly indicate whether any call clobbers were omitted.
1568 if (OmittedAnyCallClobbers) {
1569 if (!FirstOp) OS << ",";
1570 OS << " ...";
1571 }
1573 bool HaveSemi = false;
1574 const unsigned PrintableFlags = FrameSetup;
1575 if (Flags & PrintableFlags) {
1576 if (!HaveSemi) OS << ";"; HaveSemi = true;
1577 OS << " flags: ";
1579 if (Flags & FrameSetup)
1580 OS << "FrameSetup";
1581 }
1583 if (!memoperands_empty()) {
1584 if (!HaveSemi) OS << ";"; HaveSemi = true;
1586 OS << " mem:";
1587 for (mmo_iterator i = memoperands_begin(), e = memoperands_end();
1588 i != e; ++i) {
1589 OS << **i;
1590 if (llvm::next(i) != e)
1591 OS << " ";
1592 }
1593 }
1595 // Print the regclass of any virtual registers encountered.
1596 if (MRI && !VirtRegs.empty()) {
1597 if (!HaveSemi) OS << ";"; HaveSemi = true;
1598 for (unsigned i = 0; i != VirtRegs.size(); ++i) {
1599 const TargetRegisterClass *RC = MRI->getRegClass(VirtRegs[i]);
1600 OS << " " << RC->getName() << ':' << PrintReg(VirtRegs[i]);
1601 for (unsigned j = i+1; j != VirtRegs.size();) {
1602 if (MRI->getRegClass(VirtRegs[j]) != RC) {
1603 ++j;
1604 continue;
1605 }
1606 if (VirtRegs[i] != VirtRegs[j])
1607 OS << "," << PrintReg(VirtRegs[j]);
1608 VirtRegs.erase(VirtRegs.begin()+j);
1609 }
1610 }
1611 }
1613 // Print debug location information.
1614 if (isDebugValue() && getOperand(e - 1).isMetadata()) {
1615 if (!HaveSemi) OS << ";"; HaveSemi = true;
1616 DIVariable DV(getOperand(e - 1).getMetadata());
1617 OS << " line no:" << DV.getLineNumber();
1618 if (MDNode *InlinedAt = DV.getInlinedAt()) {
1619 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(InlinedAt);
1620 if (!InlinedAtDL.isUnknown()) {
1621 OS << " inlined @[ ";
1622 printDebugLoc(InlinedAtDL, MF, OS);
1623 OS << " ]";
1624 }
1625 }
1626 } else if (!debugLoc.isUnknown() && MF) {
1627 if (!HaveSemi) OS << ";"; HaveSemi = true;
1628 OS << " dbg:";
1629 printDebugLoc(debugLoc, MF, OS);
1630 }
1632 OS << '\n';
1633 }
1635 bool MachineInstr::addRegisterKilled(unsigned IncomingReg,
1636 const TargetRegisterInfo *RegInfo,
1637 bool AddIfNotFound) {
1638 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg);
1639 bool hasAliases = isPhysReg &&
1640 MCRegAliasIterator(IncomingReg, RegInfo, false).isValid();
1641 bool Found = false;
1642 SmallVector<unsigned,4> DeadOps;
1643 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1644 MachineOperand &MO = getOperand(i);
1645 if (!MO.isReg() || !MO.isUse() || MO.isUndef())
1646 continue;
1647 unsigned Reg = MO.getReg();
1648 if (!Reg)
1649 continue;
1651 if (Reg == IncomingReg) {
1652 if (!Found) {
1653 if (MO.isKill())
1654 // The register is already marked kill.
1655 return true;
1656 if (isPhysReg && isRegTiedToDefOperand(i))
1657 // Two-address uses of physregs must not be marked kill.
1658 return true;
1659 MO.setIsKill();
1660 Found = true;
1661 }
1662 } else if (hasAliases && MO.isKill() &&
1663 TargetRegisterInfo::isPhysicalRegister(Reg)) {
1664 // A super-register kill already exists.
1665 if (RegInfo->isSuperRegister(IncomingReg, Reg))
1666 return true;
1667 if (RegInfo->isSubRegister(IncomingReg, Reg))
1668 DeadOps.push_back(i);
1669 }
1670 }
1672 // Trim unneeded kill operands.
1673 while (!DeadOps.empty()) {
1674 unsigned OpIdx = DeadOps.back();
1675 if (getOperand(OpIdx).isImplicit())
1676 RemoveOperand(OpIdx);
1677 else
1678 getOperand(OpIdx).setIsKill(false);
1679 DeadOps.pop_back();
1680 }
1682 // If not found, this means an alias of one of the operands is killed. Add a
1683 // new implicit operand if required.
1684 if (!Found && AddIfNotFound) {
1685 addOperand(MachineOperand::CreateReg(IncomingReg,
1686 false /*IsDef*/,
1687 true /*IsImp*/,
1688 true /*IsKill*/));
1689 return true;
1690 }
1691 return Found;
1692 }
1694 void MachineInstr::clearRegisterKills(unsigned Reg,
1695 const TargetRegisterInfo *RegInfo) {
1696 if (!TargetRegisterInfo::isPhysicalRegister(Reg))
1697 RegInfo = 0;
1698 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1699 MachineOperand &MO = getOperand(i);
1700 if (!MO.isReg() || !MO.isUse() || !MO.isKill())
1701 continue;
1702 unsigned OpReg = MO.getReg();
1703 if (OpReg == Reg || (RegInfo && RegInfo->isSuperRegister(Reg, OpReg)))
1704 MO.setIsKill(false);
1705 }
1706 }
1708 bool MachineInstr::addRegisterDead(unsigned Reg,
1709 const TargetRegisterInfo *RegInfo,
1710 bool AddIfNotFound) {
1711 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(Reg);
1712 bool hasAliases = isPhysReg &&
1713 MCRegAliasIterator(Reg, RegInfo, false).isValid();
1714 bool Found = false;
1715 SmallVector<unsigned,4> DeadOps;
1716 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1717 MachineOperand &MO = getOperand(i);
1718 if (!MO.isReg() || !MO.isDef())
1719 continue;
1720 unsigned MOReg = MO.getReg();
1721 if (!MOReg)
1722 continue;
1724 if (MOReg == Reg) {
1725 MO.setIsDead();
1726 Found = true;
1727 } else if (hasAliases && MO.isDead() &&
1728 TargetRegisterInfo::isPhysicalRegister(MOReg)) {
1729 // There exists a super-register that's marked dead.
1730 if (RegInfo->isSuperRegister(Reg, MOReg))
1731 return true;
1732 if (RegInfo->isSubRegister(Reg, MOReg))
1733 DeadOps.push_back(i);
1734 }
1735 }
1737 // Trim unneeded dead operands.
1738 while (!DeadOps.empty()) {
1739 unsigned OpIdx = DeadOps.back();
1740 if (getOperand(OpIdx).isImplicit())
1741 RemoveOperand(OpIdx);
1742 else
1743 getOperand(OpIdx).setIsDead(false);
1744 DeadOps.pop_back();
1745 }
1747 // If not found, this means an alias of one of the operands is dead. Add a
1748 // new implicit operand if required.
1749 if (Found || !AddIfNotFound)
1750 return Found;
1752 addOperand(MachineOperand::CreateReg(Reg,
1753 true /*IsDef*/,
1754 true /*IsImp*/,
1755 false /*IsKill*/,
1756 true /*IsDead*/));
1757 return true;
1758 }
1760 void MachineInstr::addRegisterDefined(unsigned Reg,
1761 const TargetRegisterInfo *RegInfo) {
1762 if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
1763 MachineOperand *MO = findRegisterDefOperand(Reg, false, RegInfo);
1764 if (MO)
1765 return;
1766 } else {
1767 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1768 const MachineOperand &MO = getOperand(i);
1769 if (MO.isReg() && MO.getReg() == Reg && MO.isDef() &&
1770 MO.getSubReg() == 0)
1771 return;
1772 }
1773 }
1774 addOperand(MachineOperand::CreateReg(Reg,
1775 true /*IsDef*/,
1776 true /*IsImp*/));
1777 }
1779 void MachineInstr::setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs,
1780 const TargetRegisterInfo &TRI) {
1781 bool HasRegMask = false;
1782 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
1783 MachineOperand &MO = getOperand(i);
1784 if (MO.isRegMask()) {
1785 HasRegMask = true;
1786 continue;
1787 }
1788 if (!MO.isReg() || !MO.isDef()) continue;
1789 unsigned Reg = MO.getReg();
1790 if (!TargetRegisterInfo::isPhysicalRegister(Reg)) continue;
1791 bool Dead = true;
1792 for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
1793 I != E; ++I)
1794 if (TRI.regsOverlap(*I, Reg)) {
1795 Dead = false;
1796 break;
1797 }
1798 // If there are no uses, including partial uses, the def is dead.
1799 if (Dead) MO.setIsDead();
1800 }
1802 // This is a call with a register mask operand.
1803 // Mask clobbers are always dead, so add defs for the non-dead defines.
1804 if (HasRegMask)
1805 for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end();
1806 I != E; ++I)
1807 addRegisterDefined(*I, &TRI);
1808 }
1810 unsigned
1811 MachineInstrExpressionTrait::getHashValue(const MachineInstr* const &MI) {
1812 // Build up a buffer of hash code components.
1813 SmallVector<size_t, 8> HashComponents;
1814 HashComponents.reserve(MI->getNumOperands() + 1);
1815 HashComponents.push_back(MI->getOpcode());
1816 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
1817 const MachineOperand &MO = MI->getOperand(i);
1818 if (MO.isReg() && MO.isDef() &&
1819 TargetRegisterInfo::isVirtualRegister(MO.getReg()))
1820 continue; // Skip virtual register defs.
1822 HashComponents.push_back(hash_value(MO));
1823 }
1824 return hash_combine_range(HashComponents.begin(), HashComponents.end());
1825 }
1827 void MachineInstr::emitError(StringRef Msg) const {
1828 // Find the source location cookie.
1829 unsigned LocCookie = 0;
1830 const MDNode *LocMD = 0;
1831 for (unsigned i = getNumOperands(); i != 0; --i) {
1832 if (getOperand(i-1).isMetadata() &&
1833 (LocMD = getOperand(i-1).getMetadata()) &&
1834 LocMD->getNumOperands() != 0) {
1835 if (const ConstantInt *CI = dyn_cast<ConstantInt>(LocMD->getOperand(0))) {
1836 LocCookie = CI->getZExtValue();
1837 break;
1838 }
1839 }
1840 }
1842 if (const MachineBasicBlock *MBB = getParent())
1843 if (const MachineFunction *MF = MBB->getParent())
1844 return MF->getMMI().getModule()->getContext().emitError(LocCookie, Msg);
1845 report_fatal_error(Msg);
1846 }