MachineInstr.cpp revision 00195d828b934455da597dbba72f1aade4e53393
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//===----------------------------------------------------------------------===// 13 14#include "llvm/CodeGen/MachineInstr.h" 15#include "llvm/Constants.h" 16#include "llvm/Function.h" 17#include "llvm/InlineAsm.h" 18#include "llvm/LLVMContext.h" 19#include "llvm/Metadata.h" 20#include "llvm/Module.h" 21#include "llvm/Type.h" 22#include "llvm/Value.h" 23#include "llvm/Assembly/Writer.h" 24#include "llvm/CodeGen/MachineConstantPool.h" 25#include "llvm/CodeGen/MachineFunction.h" 26#include "llvm/CodeGen/MachineMemOperand.h" 27#include "llvm/CodeGen/MachineModuleInfo.h" 28#include "llvm/CodeGen/MachineRegisterInfo.h" 29#include "llvm/CodeGen/PseudoSourceValue.h" 30#include "llvm/MC/MCInstrDesc.h" 31#include "llvm/MC/MCSymbol.h" 32#include "llvm/Target/TargetMachine.h" 33#include "llvm/Target/TargetInstrInfo.h" 34#include "llvm/Target/TargetRegisterInfo.h" 35#include "llvm/Analysis/AliasAnalysis.h" 36#include "llvm/Analysis/DebugInfo.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" 43using namespace llvm; 44 45//===----------------------------------------------------------------------===// 46// MachineOperand Implementation 47//===----------------------------------------------------------------------===// 48 49/// AddRegOperandToRegInfo - Add this register operand to the specified 50/// MachineRegisterInfo. If it is null, then the next/prev fields should be 51/// explicitly nulled out. 52void MachineOperand::AddRegOperandToRegInfo(MachineRegisterInfo *RegInfo) { 53 assert(isReg() && "Can only add reg operand to use lists"); 54 55 // If the reginfo pointer is null, just explicitly null out or next/prev 56 // pointers, to ensure they are not garbage. 57 if (RegInfo == 0) { 58 Contents.Reg.Prev = 0; 59 Contents.Reg.Next = 0; 60 return; 61 } 62 63 // Otherwise, add this operand to the head of the registers use/def list. 64 MachineOperand **Head = &RegInfo->getRegUseDefListHead(getReg()); 65 66 // For SSA values, we prefer to keep the definition at the start of the list. 67 // we do this by skipping over the definition if it is at the head of the 68 // list. 69 if (*Head && (*Head)->isDef()) 70 Head = &(*Head)->Contents.Reg.Next; 71 72 Contents.Reg.Next = *Head; 73 if (Contents.Reg.Next) { 74 assert(getReg() == Contents.Reg.Next->getReg() && 75 "Different regs on the same list!"); 76 Contents.Reg.Next->Contents.Reg.Prev = &Contents.Reg.Next; 77 } 78 79 Contents.Reg.Prev = Head; 80 *Head = this; 81} 82 83/// RemoveRegOperandFromRegInfo - Remove this register operand from the 84/// MachineRegisterInfo it is linked with. 85void MachineOperand::RemoveRegOperandFromRegInfo() { 86 assert(isOnRegUseList() && "Reg operand is not on a use list"); 87 // Unlink this from the doubly linked list of operands. 88 MachineOperand *NextOp = Contents.Reg.Next; 89 *Contents.Reg.Prev = NextOp; 90 if (NextOp) { 91 assert(NextOp->getReg() == getReg() && "Corrupt reg use/def chain!"); 92 NextOp->Contents.Reg.Prev = Contents.Reg.Prev; 93 } 94 Contents.Reg.Prev = 0; 95 Contents.Reg.Next = 0; 96} 97 98void MachineOperand::setReg(unsigned Reg) { 99 if (getReg() == Reg) return; // No change. 100 101 // Otherwise, we have to change the register. If this operand is embedded 102 // into a machine function, we need to update the old and new register's 103 // use/def lists. 104 if (MachineInstr *MI = getParent()) 105 if (MachineBasicBlock *MBB = MI->getParent()) 106 if (MachineFunction *MF = MBB->getParent()) { 107 RemoveRegOperandFromRegInfo(); 108 SmallContents.RegNo = Reg; 109 AddRegOperandToRegInfo(&MF->getRegInfo()); 110 return; 111 } 112 113 // Otherwise, just change the register, no problem. :) 114 SmallContents.RegNo = Reg; 115} 116 117void MachineOperand::substVirtReg(unsigned Reg, unsigned SubIdx, 118 const TargetRegisterInfo &TRI) { 119 assert(TargetRegisterInfo::isVirtualRegister(Reg)); 120 if (SubIdx && getSubReg()) 121 SubIdx = TRI.composeSubRegIndices(SubIdx, getSubReg()); 122 setReg(Reg); 123 if (SubIdx) 124 setSubReg(SubIdx); 125} 126 127void MachineOperand::substPhysReg(unsigned Reg, const TargetRegisterInfo &TRI) { 128 assert(TargetRegisterInfo::isPhysicalRegister(Reg)); 129 if (getSubReg()) { 130 Reg = TRI.getSubReg(Reg, getSubReg()); 131 // Note that getSubReg() may return 0 if the sub-register doesn't exist. 132 // That won't happen in legal code. 133 setSubReg(0); 134 } 135 setReg(Reg); 136} 137 138/// ChangeToImmediate - Replace this operand with a new immediate operand of 139/// the specified value. If an operand is known to be an immediate already, 140/// the setImm method should be used. 141void MachineOperand::ChangeToImmediate(int64_t ImmVal) { 142 // If this operand is currently a register operand, and if this is in a 143 // function, deregister the operand from the register's use/def list. 144 if (isReg() && getParent() && getParent()->getParent() && 145 getParent()->getParent()->getParent()) 146 RemoveRegOperandFromRegInfo(); 147 148 OpKind = MO_Immediate; 149 Contents.ImmVal = ImmVal; 150} 151 152/// ChangeToRegister - Replace this operand with a new register operand of 153/// the specified value. If an operand is known to be an register already, 154/// the setReg method should be used. 155void MachineOperand::ChangeToRegister(unsigned Reg, bool isDef, bool isImp, 156 bool isKill, bool isDead, bool isUndef, 157 bool isDebug) { 158 // If this operand is already a register operand, use setReg to update the 159 // register's use/def lists. 160 if (isReg()) { 161 assert(!isEarlyClobber()); 162 setReg(Reg); 163 } else { 164 // Otherwise, change this to a register and set the reg#. 165 OpKind = MO_Register; 166 SmallContents.RegNo = Reg; 167 168 // If this operand is embedded in a function, add the operand to the 169 // register's use/def list. 170 if (MachineInstr *MI = getParent()) 171 if (MachineBasicBlock *MBB = MI->getParent()) 172 if (MachineFunction *MF = MBB->getParent()) 173 AddRegOperandToRegInfo(&MF->getRegInfo()); 174 } 175 176 IsDef = isDef; 177 IsImp = isImp; 178 IsKill = isKill; 179 IsDead = isDead; 180 IsUndef = isUndef; 181 IsInternalRead = false; 182 IsEarlyClobber = false; 183 IsDebug = isDebug; 184 SubReg = 0; 185} 186 187/// isIdenticalTo - Return true if this operand is identical to the specified 188/// operand. 189bool MachineOperand::isIdenticalTo(const MachineOperand &Other) const { 190 if (getType() != Other.getType() || 191 getTargetFlags() != Other.getTargetFlags()) 192 return false; 193 194 switch (getType()) { 195 case MachineOperand::MO_Register: 196 return getReg() == Other.getReg() && isDef() == Other.isDef() && 197 getSubReg() == Other.getSubReg(); 198 case MachineOperand::MO_Immediate: 199 return getImm() == Other.getImm(); 200 case MachineOperand::MO_CImmediate: 201 return getCImm() == Other.getCImm(); 202 case MachineOperand::MO_FPImmediate: 203 return getFPImm() == Other.getFPImm(); 204 case MachineOperand::MO_MachineBasicBlock: 205 return getMBB() == Other.getMBB(); 206 case MachineOperand::MO_FrameIndex: 207 return getIndex() == Other.getIndex(); 208 case MachineOperand::MO_ConstantPoolIndex: 209 return getIndex() == Other.getIndex() && getOffset() == Other.getOffset(); 210 case MachineOperand::MO_JumpTableIndex: 211 return getIndex() == Other.getIndex(); 212 case MachineOperand::MO_GlobalAddress: 213 return getGlobal() == Other.getGlobal() && getOffset() == Other.getOffset(); 214 case MachineOperand::MO_ExternalSymbol: 215 return !strcmp(getSymbolName(), Other.getSymbolName()) && 216 getOffset() == Other.getOffset(); 217 case MachineOperand::MO_BlockAddress: 218 return getBlockAddress() == Other.getBlockAddress(); 219 case MO_RegisterMask: 220 return getRegMask() == Other.getRegMask(); 221 case MachineOperand::MO_MCSymbol: 222 return getMCSymbol() == Other.getMCSymbol(); 223 case MachineOperand::MO_Metadata: 224 return getMetadata() == Other.getMetadata(); 225 } 226 llvm_unreachable("Invalid machine operand type"); 227} 228 229/// print - Print the specified machine operand. 230/// 231void MachineOperand::print(raw_ostream &OS, const TargetMachine *TM) const { 232 // If the instruction is embedded into a basic block, we can find the 233 // target info for the instruction. 234 if (!TM) 235 if (const MachineInstr *MI = getParent()) 236 if (const MachineBasicBlock *MBB = MI->getParent()) 237 if (const MachineFunction *MF = MBB->getParent()) 238 TM = &MF->getTarget(); 239 const TargetRegisterInfo *TRI = TM ? TM->getRegisterInfo() : 0; 240 241 switch (getType()) { 242 case MachineOperand::MO_Register: 243 OS << PrintReg(getReg(), TRI, getSubReg()); 244 245 if (isDef() || isKill() || isDead() || isImplicit() || isUndef() || 246 isInternalRead() || isEarlyClobber()) { 247 OS << '<'; 248 bool NeedComma = false; 249 if (isDef()) { 250 if (NeedComma) OS << ','; 251 if (isEarlyClobber()) 252 OS << "earlyclobber,"; 253 if (isImplicit()) 254 OS << "imp-"; 255 OS << "def"; 256 NeedComma = true; 257 } else if (isImplicit()) { 258 OS << "imp-use"; 259 NeedComma = true; 260 } 261 262 if (isKill() || isDead() || isUndef() || isInternalRead()) { 263 if (NeedComma) OS << ','; 264 NeedComma = false; 265 if (isKill()) { 266 OS << "kill"; 267 NeedComma = true; 268 } 269 if (isDead()) { 270 OS << "dead"; 271 NeedComma = true; 272 } 273 if (isUndef()) { 274 if (NeedComma) OS << ','; 275 OS << "undef"; 276 NeedComma = true; 277 } 278 if (isInternalRead()) { 279 if (NeedComma) OS << ','; 280 OS << "internal"; 281 NeedComma = true; 282 } 283 } 284 OS << '>'; 285 } 286 break; 287 case MachineOperand::MO_Immediate: 288 OS << getImm(); 289 break; 290 case MachineOperand::MO_CImmediate: 291 getCImm()->getValue().print(OS, false); 292 break; 293 case MachineOperand::MO_FPImmediate: 294 if (getFPImm()->getType()->isFloatTy()) 295 OS << getFPImm()->getValueAPF().convertToFloat(); 296 else 297 OS << getFPImm()->getValueAPF().convertToDouble(); 298 break; 299 case MachineOperand::MO_MachineBasicBlock: 300 OS << "<BB#" << getMBB()->getNumber() << ">"; 301 break; 302 case MachineOperand::MO_FrameIndex: 303 OS << "<fi#" << getIndex() << '>'; 304 break; 305 case MachineOperand::MO_ConstantPoolIndex: 306 OS << "<cp#" << getIndex(); 307 if (getOffset()) OS << "+" << getOffset(); 308 OS << '>'; 309 break; 310 case MachineOperand::MO_JumpTableIndex: 311 OS << "<jt#" << getIndex() << '>'; 312 break; 313 case MachineOperand::MO_GlobalAddress: 314 OS << "<ga:"; 315 WriteAsOperand(OS, getGlobal(), /*PrintType=*/false); 316 if (getOffset()) OS << "+" << getOffset(); 317 OS << '>'; 318 break; 319 case MachineOperand::MO_ExternalSymbol: 320 OS << "<es:" << getSymbolName(); 321 if (getOffset()) OS << "+" << getOffset(); 322 OS << '>'; 323 break; 324 case MachineOperand::MO_BlockAddress: 325 OS << '<'; 326 WriteAsOperand(OS, getBlockAddress(), /*PrintType=*/false); 327 OS << '>'; 328 break; 329 case MachineOperand::MO_RegisterMask: 330 OS << "<regmask>"; 331 break; 332 case MachineOperand::MO_Metadata: 333 OS << '<'; 334 WriteAsOperand(OS, getMetadata(), /*PrintType=*/false); 335 OS << '>'; 336 break; 337 case MachineOperand::MO_MCSymbol: 338 OS << "<MCSym=" << *getMCSymbol() << '>'; 339 break; 340 } 341 342 if (unsigned TF = getTargetFlags()) 343 OS << "[TF=" << TF << ']'; 344} 345 346//===----------------------------------------------------------------------===// 347// MachineMemOperand Implementation 348//===----------------------------------------------------------------------===// 349 350/// getAddrSpace - Return the LLVM IR address space number that this pointer 351/// points into. 352unsigned MachinePointerInfo::getAddrSpace() const { 353 if (V == 0) return 0; 354 return cast<PointerType>(V->getType())->getAddressSpace(); 355} 356 357/// getConstantPool - Return a MachinePointerInfo record that refers to the 358/// constant pool. 359MachinePointerInfo MachinePointerInfo::getConstantPool() { 360 return MachinePointerInfo(PseudoSourceValue::getConstantPool()); 361} 362 363/// getFixedStack - Return a MachinePointerInfo record that refers to the 364/// the specified FrameIndex. 365MachinePointerInfo MachinePointerInfo::getFixedStack(int FI, int64_t offset) { 366 return MachinePointerInfo(PseudoSourceValue::getFixedStack(FI), offset); 367} 368 369MachinePointerInfo MachinePointerInfo::getJumpTable() { 370 return MachinePointerInfo(PseudoSourceValue::getJumpTable()); 371} 372 373MachinePointerInfo MachinePointerInfo::getGOT() { 374 return MachinePointerInfo(PseudoSourceValue::getGOT()); 375} 376 377MachinePointerInfo MachinePointerInfo::getStack(int64_t Offset) { 378 return MachinePointerInfo(PseudoSourceValue::getStack(), Offset); 379} 380 381MachineMemOperand::MachineMemOperand(MachinePointerInfo ptrinfo, unsigned f, 382 uint64_t s, unsigned int a, 383 const MDNode *TBAAInfo) 384 : PtrInfo(ptrinfo), Size(s), 385 Flags((f & ((1 << MOMaxBits) - 1)) | ((Log2_32(a) + 1) << MOMaxBits)), 386 TBAAInfo(TBAAInfo) { 387 assert((PtrInfo.V == 0 || isa<PointerType>(PtrInfo.V->getType())) && 388 "invalid pointer value"); 389 assert(getBaseAlignment() == a && "Alignment is not a power of 2!"); 390 assert((isLoad() || isStore()) && "Not a load/store!"); 391} 392 393/// Profile - Gather unique data for the object. 394/// 395void MachineMemOperand::Profile(FoldingSetNodeID &ID) const { 396 ID.AddInteger(getOffset()); 397 ID.AddInteger(Size); 398 ID.AddPointer(getValue()); 399 ID.AddInteger(Flags); 400} 401 402void MachineMemOperand::refineAlignment(const MachineMemOperand *MMO) { 403 // The Value and Offset may differ due to CSE. But the flags and size 404 // should be the same. 405 assert(MMO->getFlags() == getFlags() && "Flags mismatch!"); 406 assert(MMO->getSize() == getSize() && "Size mismatch!"); 407 408 if (MMO->getBaseAlignment() >= getBaseAlignment()) { 409 // Update the alignment value. 410 Flags = (Flags & ((1 << MOMaxBits) - 1)) | 411 ((Log2_32(MMO->getBaseAlignment()) + 1) << MOMaxBits); 412 // Also update the base and offset, because the new alignment may 413 // not be applicable with the old ones. 414 PtrInfo = MMO->PtrInfo; 415 } 416} 417 418/// getAlignment - Return the minimum known alignment in bytes of the 419/// actual memory reference. 420uint64_t MachineMemOperand::getAlignment() const { 421 return MinAlign(getBaseAlignment(), getOffset()); 422} 423 424raw_ostream &llvm::operator<<(raw_ostream &OS, const MachineMemOperand &MMO) { 425 assert((MMO.isLoad() || MMO.isStore()) && 426 "SV has to be a load, store or both."); 427 428 if (MMO.isVolatile()) 429 OS << "Volatile "; 430 431 if (MMO.isLoad()) 432 OS << "LD"; 433 if (MMO.isStore()) 434 OS << "ST"; 435 OS << MMO.getSize(); 436 437 // Print the address information. 438 OS << "["; 439 if (!MMO.getValue()) 440 OS << "<unknown>"; 441 else 442 WriteAsOperand(OS, MMO.getValue(), /*PrintType=*/false); 443 444 // If the alignment of the memory reference itself differs from the alignment 445 // of the base pointer, print the base alignment explicitly, next to the base 446 // pointer. 447 if (MMO.getBaseAlignment() != MMO.getAlignment()) 448 OS << "(align=" << MMO.getBaseAlignment() << ")"; 449 450 if (MMO.getOffset() != 0) 451 OS << "+" << MMO.getOffset(); 452 OS << "]"; 453 454 // Print the alignment of the reference. 455 if (MMO.getBaseAlignment() != MMO.getAlignment() || 456 MMO.getBaseAlignment() != MMO.getSize()) 457 OS << "(align=" << MMO.getAlignment() << ")"; 458 459 // Print TBAA info. 460 if (const MDNode *TBAAInfo = MMO.getTBAAInfo()) { 461 OS << "(tbaa="; 462 if (TBAAInfo->getNumOperands() > 0) 463 WriteAsOperand(OS, TBAAInfo->getOperand(0), /*PrintType=*/false); 464 else 465 OS << "<unknown>"; 466 OS << ")"; 467 } 468 469 // Print nontemporal info. 470 if (MMO.isNonTemporal()) 471 OS << "(nontemporal)"; 472 473 return OS; 474} 475 476//===----------------------------------------------------------------------===// 477// MachineInstr Implementation 478//===----------------------------------------------------------------------===// 479 480/// MachineInstr ctor - This constructor creates a dummy MachineInstr with 481/// MCID NULL and no operands. 482MachineInstr::MachineInstr() 483 : MCID(0), Flags(0), AsmPrinterFlags(0), 484 MemRefs(0), MemRefsEnd(0), 485 Parent(0) { 486 // Make sure that we get added to a machine basicblock 487 LeakDetector::addGarbageObject(this); 488} 489 490void MachineInstr::addImplicitDefUseOperands() { 491 if (MCID->ImplicitDefs) 492 for (const unsigned *ImpDefs = MCID->ImplicitDefs; *ImpDefs; ++ImpDefs) 493 addOperand(MachineOperand::CreateReg(*ImpDefs, true, true)); 494 if (MCID->ImplicitUses) 495 for (const unsigned *ImpUses = MCID->ImplicitUses; *ImpUses; ++ImpUses) 496 addOperand(MachineOperand::CreateReg(*ImpUses, false, true)); 497} 498 499/// MachineInstr ctor - This constructor creates a MachineInstr and adds the 500/// implicit operands. It reserves space for the number of operands specified by 501/// the MCInstrDesc. 502MachineInstr::MachineInstr(const MCInstrDesc &tid, bool NoImp) 503 : MCID(&tid), Flags(0), AsmPrinterFlags(0), 504 MemRefs(0), MemRefsEnd(0), Parent(0) { 505 unsigned NumImplicitOps = 0; 506 if (!NoImp) 507 NumImplicitOps = MCID->getNumImplicitDefs() + MCID->getNumImplicitUses(); 508 Operands.reserve(NumImplicitOps + MCID->getNumOperands()); 509 if (!NoImp) 510 addImplicitDefUseOperands(); 511 // Make sure that we get added to a machine basicblock 512 LeakDetector::addGarbageObject(this); 513} 514 515/// MachineInstr ctor - As above, but with a DebugLoc. 516MachineInstr::MachineInstr(const MCInstrDesc &tid, const DebugLoc dl, 517 bool NoImp) 518 : MCID(&tid), Flags(0), AsmPrinterFlags(0), 519 MemRefs(0), MemRefsEnd(0), Parent(0), debugLoc(dl) { 520 unsigned NumImplicitOps = 0; 521 if (!NoImp) 522 NumImplicitOps = MCID->getNumImplicitDefs() + MCID->getNumImplicitUses(); 523 Operands.reserve(NumImplicitOps + MCID->getNumOperands()); 524 if (!NoImp) 525 addImplicitDefUseOperands(); 526 // Make sure that we get added to a machine basicblock 527 LeakDetector::addGarbageObject(this); 528} 529 530/// MachineInstr ctor - Work exactly the same as the ctor two above, except 531/// that the MachineInstr is created and added to the end of the specified 532/// basic block. 533MachineInstr::MachineInstr(MachineBasicBlock *MBB, const MCInstrDesc &tid) 534 : MCID(&tid), Flags(0), AsmPrinterFlags(0), 535 MemRefs(0), MemRefsEnd(0), Parent(0) { 536 assert(MBB && "Cannot use inserting ctor with null basic block!"); 537 unsigned NumImplicitOps = 538 MCID->getNumImplicitDefs() + MCID->getNumImplicitUses(); 539 Operands.reserve(NumImplicitOps + MCID->getNumOperands()); 540 addImplicitDefUseOperands(); 541 // Make sure that we get added to a machine basicblock 542 LeakDetector::addGarbageObject(this); 543 MBB->push_back(this); // Add instruction to end of basic block! 544} 545 546/// MachineInstr ctor - As above, but with a DebugLoc. 547/// 548MachineInstr::MachineInstr(MachineBasicBlock *MBB, const DebugLoc dl, 549 const MCInstrDesc &tid) 550 : MCID(&tid), Flags(0), AsmPrinterFlags(0), 551 MemRefs(0), MemRefsEnd(0), Parent(0), debugLoc(dl) { 552 assert(MBB && "Cannot use inserting ctor with null basic block!"); 553 unsigned NumImplicitOps = 554 MCID->getNumImplicitDefs() + MCID->getNumImplicitUses(); 555 Operands.reserve(NumImplicitOps + MCID->getNumOperands()); 556 addImplicitDefUseOperands(); 557 // Make sure that we get added to a machine basicblock 558 LeakDetector::addGarbageObject(this); 559 MBB->push_back(this); // Add instruction to end of basic block! 560} 561 562/// MachineInstr ctor - Copies MachineInstr arg exactly 563/// 564MachineInstr::MachineInstr(MachineFunction &MF, const MachineInstr &MI) 565 : MCID(&MI.getDesc()), Flags(0), AsmPrinterFlags(0), 566 MemRefs(MI.MemRefs), MemRefsEnd(MI.MemRefsEnd), 567 Parent(0), debugLoc(MI.getDebugLoc()) { 568 Operands.reserve(MI.getNumOperands()); 569 570 // Add operands 571 for (unsigned i = 0; i != MI.getNumOperands(); ++i) 572 addOperand(MI.getOperand(i)); 573 574 // Copy all the flags. 575 Flags = MI.Flags; 576 577 // Set parent to null. 578 Parent = 0; 579 580 LeakDetector::addGarbageObject(this); 581} 582 583MachineInstr::~MachineInstr() { 584 LeakDetector::removeGarbageObject(this); 585#ifndef NDEBUG 586 for (unsigned i = 0, e = Operands.size(); i != e; ++i) { 587 assert(Operands[i].ParentMI == this && "ParentMI mismatch!"); 588 assert((!Operands[i].isReg() || !Operands[i].isOnRegUseList()) && 589 "Reg operand def/use list corrupted"); 590 } 591#endif 592} 593 594/// getRegInfo - If this instruction is embedded into a MachineFunction, 595/// return the MachineRegisterInfo object for the current function, otherwise 596/// return null. 597MachineRegisterInfo *MachineInstr::getRegInfo() { 598 if (MachineBasicBlock *MBB = getParent()) 599 return &MBB->getParent()->getRegInfo(); 600 return 0; 601} 602 603/// RemoveRegOperandsFromUseLists - Unlink all of the register operands in 604/// this instruction from their respective use lists. This requires that the 605/// operands already be on their use lists. 606void MachineInstr::RemoveRegOperandsFromUseLists() { 607 for (unsigned i = 0, e = Operands.size(); i != e; ++i) { 608 if (Operands[i].isReg()) 609 Operands[i].RemoveRegOperandFromRegInfo(); 610 } 611} 612 613/// AddRegOperandsToUseLists - Add all of the register operands in 614/// this instruction from their respective use lists. This requires that the 615/// operands not be on their use lists yet. 616void MachineInstr::AddRegOperandsToUseLists(MachineRegisterInfo &RegInfo) { 617 for (unsigned i = 0, e = Operands.size(); i != e; ++i) { 618 if (Operands[i].isReg()) 619 Operands[i].AddRegOperandToRegInfo(&RegInfo); 620 } 621} 622 623 624/// addOperand - Add the specified operand to the instruction. If it is an 625/// implicit operand, it is added to the end of the operand list. If it is 626/// an explicit operand it is added at the end of the explicit operand list 627/// (before the first implicit operand). 628void MachineInstr::addOperand(const MachineOperand &Op) { 629 assert(MCID && "Cannot add operands before providing an instr descriptor"); 630 bool isImpReg = Op.isReg() && Op.isImplicit(); 631 MachineRegisterInfo *RegInfo = getRegInfo(); 632 633 // If the Operands backing store is reallocated, all register operands must 634 // be removed and re-added to RegInfo. It is storing pointers to operands. 635 bool Reallocate = RegInfo && 636 !Operands.empty() && Operands.size() == Operands.capacity(); 637 638 // Find the insert location for the new operand. Implicit registers go at 639 // the end, everything goes before the implicit regs. 640 unsigned OpNo = Operands.size(); 641 642 // Remove all the implicit operands from RegInfo if they need to be shifted. 643 // FIXME: Allow mixed explicit and implicit operands on inline asm. 644 // InstrEmitter::EmitSpecialNode() is marking inline asm clobbers as 645 // implicit-defs, but they must not be moved around. See the FIXME in 646 // InstrEmitter.cpp. 647 if (!isImpReg && !isInlineAsm()) { 648 while (OpNo && Operands[OpNo-1].isReg() && Operands[OpNo-1].isImplicit()) { 649 --OpNo; 650 if (RegInfo) 651 Operands[OpNo].RemoveRegOperandFromRegInfo(); 652 } 653 } 654 655 // OpNo now points as the desired insertion point. Unless this is a variadic 656 // instruction, only implicit regs are allowed beyond MCID->getNumOperands(). 657 assert((isImpReg || MCID->isVariadic() || OpNo < MCID->getNumOperands()) && 658 "Trying to add an operand to a machine instr that is already done!"); 659 660 // All operands from OpNo have been removed from RegInfo. If the Operands 661 // backing store needs to be reallocated, we also need to remove any other 662 // register operands. 663 if (Reallocate) 664 for (unsigned i = 0; i != OpNo; ++i) 665 if (Operands[i].isReg()) 666 Operands[i].RemoveRegOperandFromRegInfo(); 667 668 // Insert the new operand at OpNo. 669 Operands.insert(Operands.begin() + OpNo, Op); 670 Operands[OpNo].ParentMI = this; 671 672 // The Operands backing store has now been reallocated, so we can re-add the 673 // operands before OpNo. 674 if (Reallocate) 675 for (unsigned i = 0; i != OpNo; ++i) 676 if (Operands[i].isReg()) 677 Operands[i].AddRegOperandToRegInfo(RegInfo); 678 679 // When adding a register operand, tell RegInfo about it. 680 if (Operands[OpNo].isReg()) { 681 // Add the new operand to RegInfo, even when RegInfo is NULL. 682 // This will initialize the linked list pointers. 683 Operands[OpNo].AddRegOperandToRegInfo(RegInfo); 684 // If the register operand is flagged as early, mark the operand as such. 685 if (MCID->getOperandConstraint(OpNo, MCOI::EARLY_CLOBBER) != -1) 686 Operands[OpNo].setIsEarlyClobber(true); 687 } 688 689 // Re-add all the implicit ops. 690 if (RegInfo) { 691 for (unsigned i = OpNo + 1, e = Operands.size(); i != e; ++i) { 692 assert(Operands[i].isReg() && "Should only be an implicit reg!"); 693 Operands[i].AddRegOperandToRegInfo(RegInfo); 694 } 695 } 696} 697 698/// RemoveOperand - Erase an operand from an instruction, leaving it with one 699/// fewer operand than it started with. 700/// 701void MachineInstr::RemoveOperand(unsigned OpNo) { 702 assert(OpNo < Operands.size() && "Invalid operand number"); 703 704 // Special case removing the last one. 705 if (OpNo == Operands.size()-1) { 706 // If needed, remove from the reg def/use list. 707 if (Operands.back().isReg() && Operands.back().isOnRegUseList()) 708 Operands.back().RemoveRegOperandFromRegInfo(); 709 710 Operands.pop_back(); 711 return; 712 } 713 714 // Otherwise, we are removing an interior operand. If we have reginfo to 715 // update, remove all operands that will be shifted down from their reg lists, 716 // move everything down, then re-add them. 717 MachineRegisterInfo *RegInfo = getRegInfo(); 718 if (RegInfo) { 719 for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) { 720 if (Operands[i].isReg()) 721 Operands[i].RemoveRegOperandFromRegInfo(); 722 } 723 } 724 725 Operands.erase(Operands.begin()+OpNo); 726 727 if (RegInfo) { 728 for (unsigned i = OpNo, e = Operands.size(); i != e; ++i) { 729 if (Operands[i].isReg()) 730 Operands[i].AddRegOperandToRegInfo(RegInfo); 731 } 732 } 733} 734 735/// addMemOperand - Add a MachineMemOperand to the machine instruction. 736/// This function should be used only occasionally. The setMemRefs function 737/// is the primary method for setting up a MachineInstr's MemRefs list. 738void MachineInstr::addMemOperand(MachineFunction &MF, 739 MachineMemOperand *MO) { 740 mmo_iterator OldMemRefs = MemRefs; 741 mmo_iterator OldMemRefsEnd = MemRefsEnd; 742 743 size_t NewNum = (MemRefsEnd - MemRefs) + 1; 744 mmo_iterator NewMemRefs = MF.allocateMemRefsArray(NewNum); 745 mmo_iterator NewMemRefsEnd = NewMemRefs + NewNum; 746 747 std::copy(OldMemRefs, OldMemRefsEnd, NewMemRefs); 748 NewMemRefs[NewNum - 1] = MO; 749 750 MemRefs = NewMemRefs; 751 MemRefsEnd = NewMemRefsEnd; 752} 753 754bool 755MachineInstr::hasProperty(unsigned MCFlag, QueryType Type) const { 756 if (Type == IgnoreBundle || !isBundle()) 757 return getDesc().getFlags() & (1 << MCFlag); 758 759 const MachineBasicBlock *MBB = getParent(); 760 MachineBasicBlock::const_instr_iterator MII = *this; ++MII; 761 while (MII != MBB->end() && MII->isInsideBundle()) { 762 if (MII->getDesc().getFlags() & (1 << MCFlag)) { 763 if (Type == AnyInBundle) 764 return true; 765 } else { 766 if (Type == AllInBundle) 767 return false; 768 } 769 ++MII; 770 } 771 772 return Type == AllInBundle; 773} 774 775bool MachineInstr::isIdenticalTo(const MachineInstr *Other, 776 MICheckType Check) const { 777 // If opcodes or number of operands are not the same then the two 778 // instructions are obviously not identical. 779 if (Other->getOpcode() != getOpcode() || 780 Other->getNumOperands() != getNumOperands()) 781 return false; 782 783 if (isBundle()) { 784 // Both instructions are bundles, compare MIs inside the bundle. 785 MachineBasicBlock::const_instr_iterator I1 = *this; 786 MachineBasicBlock::const_instr_iterator E1 = getParent()->instr_end(); 787 MachineBasicBlock::const_instr_iterator I2 = *Other; 788 MachineBasicBlock::const_instr_iterator E2= Other->getParent()->instr_end(); 789 while (++I1 != E1 && I1->isInsideBundle()) { 790 ++I2; 791 if (I2 == E2 || !I2->isInsideBundle() || !I1->isIdenticalTo(I2, Check)) 792 return false; 793 } 794 } 795 796 // Check operands to make sure they match. 797 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 798 const MachineOperand &MO = getOperand(i); 799 const MachineOperand &OMO = Other->getOperand(i); 800 if (!MO.isReg()) { 801 if (!MO.isIdenticalTo(OMO)) 802 return false; 803 continue; 804 } 805 806 // Clients may or may not want to ignore defs when testing for equality. 807 // For example, machine CSE pass only cares about finding common 808 // subexpressions, so it's safe to ignore virtual register defs. 809 if (MO.isDef()) { 810 if (Check == IgnoreDefs) 811 continue; 812 else if (Check == IgnoreVRegDefs) { 813 if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) || 814 TargetRegisterInfo::isPhysicalRegister(OMO.getReg())) 815 if (MO.getReg() != OMO.getReg()) 816 return false; 817 } else { 818 if (!MO.isIdenticalTo(OMO)) 819 return false; 820 if (Check == CheckKillDead && MO.isDead() != OMO.isDead()) 821 return false; 822 } 823 } else { 824 if (!MO.isIdenticalTo(OMO)) 825 return false; 826 if (Check == CheckKillDead && MO.isKill() != OMO.isKill()) 827 return false; 828 } 829 } 830 // If DebugLoc does not match then two dbg.values are not identical. 831 if (isDebugValue()) 832 if (!getDebugLoc().isUnknown() && !Other->getDebugLoc().isUnknown() 833 && getDebugLoc() != Other->getDebugLoc()) 834 return false; 835 return true; 836} 837 838/// removeFromParent - This method unlinks 'this' from the containing basic 839/// block, and returns it, but does not delete it. 840MachineInstr *MachineInstr::removeFromParent() { 841 assert(getParent() && "Not embedded in a basic block!"); 842 843 // If it's a bundle then remove the MIs inside the bundle as well. 844 if (isBundle()) { 845 MachineBasicBlock *MBB = getParent(); 846 MachineBasicBlock::instr_iterator MII = *this; ++MII; 847 MachineBasicBlock::instr_iterator E = MBB->instr_end(); 848 while (MII != E && MII->isInsideBundle()) { 849 MachineInstr *MI = &*MII; 850 ++MII; 851 MBB->remove(MI); 852 } 853 } 854 getParent()->remove(this); 855 return this; 856} 857 858 859/// eraseFromParent - This method unlinks 'this' from the containing basic 860/// block, and deletes it. 861void MachineInstr::eraseFromParent() { 862 assert(getParent() && "Not embedded in a basic block!"); 863 // If it's a bundle then remove the MIs inside the bundle as well. 864 if (isBundle()) { 865 MachineBasicBlock *MBB = getParent(); 866 MachineBasicBlock::instr_iterator MII = *this; ++MII; 867 MachineBasicBlock::instr_iterator E = MBB->instr_end(); 868 while (MII != E && MII->isInsideBundle()) { 869 MachineInstr *MI = &*MII; 870 ++MII; 871 MBB->erase(MI); 872 } 873 } 874 getParent()->erase(this); 875} 876 877 878/// getNumExplicitOperands - Returns the number of non-implicit operands. 879/// 880unsigned MachineInstr::getNumExplicitOperands() const { 881 unsigned NumOperands = MCID->getNumOperands(); 882 if (!MCID->isVariadic()) 883 return NumOperands; 884 885 for (unsigned i = NumOperands, e = getNumOperands(); i != e; ++i) { 886 const MachineOperand &MO = getOperand(i); 887 if (!MO.isReg() || !MO.isImplicit()) 888 NumOperands++; 889 } 890 return NumOperands; 891} 892 893/// isBundled - Return true if this instruction part of a bundle. This is true 894/// if either itself or its following instruction is marked "InsideBundle". 895bool MachineInstr::isBundled() const { 896 if (isInsideBundle()) 897 return true; 898 MachineBasicBlock::const_instr_iterator nextMI = this; 899 ++nextMI; 900 return nextMI != Parent->instr_end() && nextMI->isInsideBundle(); 901} 902 903MachineInstr* MachineInstr::getBundleStart() { 904 if (!isInsideBundle()) 905 return this; 906 MachineBasicBlock::reverse_instr_iterator MII(this); 907 ++MII; 908 while (MII->isInsideBundle()) 909 ++MII; 910 return &*MII; 911} 912 913bool MachineInstr::isStackAligningInlineAsm() const { 914 if (isInlineAsm()) { 915 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm(); 916 if (ExtraInfo & InlineAsm::Extra_IsAlignStack) 917 return true; 918 } 919 return false; 920} 921 922int MachineInstr::findInlineAsmFlagIdx(unsigned OpIdx, 923 unsigned *GroupNo) const { 924 assert(isInlineAsm() && "Expected an inline asm instruction"); 925 assert(OpIdx < getNumOperands() && "OpIdx out of range"); 926 927 // Ignore queries about the initial operands. 928 if (OpIdx < InlineAsm::MIOp_FirstOperand) 929 return -1; 930 931 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} 949 950const TargetRegisterClass* 951MachineInstr::getRegClassConstraint(unsigned OpIdx, 952 const TargetInstrInfo *TII, 953 const TargetRegisterInfo *TRI) const { 954 // Most opcodes have fixed constraints in their MCInstrDesc. 955 if (!isInlineAsm()) 956 return TII->getRegClass(getDesc(), OpIdx, TRI); 957 958 if (!getOperand(OpIdx).isReg()) 959 return NULL; 960 961 // For tied uses on inline asm, get the constraint from the def. 962 unsigned DefIdx; 963 if (getOperand(OpIdx).isUse() && isRegTiedToDefOperand(OpIdx, &DefIdx)) 964 OpIdx = DefIdx; 965 966 // Inline asm stores register class constraints in the flag word. 967 int FlagIdx = findInlineAsmFlagIdx(OpIdx); 968 if (FlagIdx < 0) 969 return NULL; 970 971 unsigned Flag = getOperand(FlagIdx).getImm(); 972 unsigned RCID; 973 if (InlineAsm::hasRegClassConstraint(Flag, RCID)) 974 return TRI->getRegClass(RCID); 975 976 // Assume that all registers in a memory operand are pointers. 977 if (InlineAsm::getKind(Flag) == InlineAsm::Kind_Mem) 978 return TRI->getPointerRegClass(); 979 980 return NULL; 981} 982 983/// getBundleSize - Return the number of instructions inside the MI bundle. 984unsigned MachineInstr::getBundleSize() const { 985 assert(isBundle() && "Expecting a bundle"); 986 987 MachineBasicBlock::const_instr_iterator I = *this; 988 unsigned Size = 0; 989 while ((++I)->isInsideBundle()) { 990 ++Size; 991 } 992 assert(Size > 1 && "Malformed bundle"); 993 994 return Size; 995} 996 997/// 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. 1000int 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} 1019 1020/// readsWritesVirtualRegister - Return a pair of bools (reads, writes) 1021/// indicating if this instruction reads or writes Reg. This also considers 1022/// partial defines. 1023std::pair<bool,bool> 1024MachineInstr::readsWritesVirtualRegister(unsigned Reg, 1025 SmallVectorImpl<unsigned> *Ops) const { 1026 bool PartDef = false; // Partial redefine. 1027 bool FullDef = false; // Full define. 1028 bool Use = false; 1029 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} 1047 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. 1052int 1053MachineInstr::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} 1078 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. 1082int 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 } 1093 1094 return -1; 1095} 1096 1097/// isRegTiedToUseOperand - Given the index of a register def operand, 1098/// check if the register def is tied to a source operand, due to either 1099/// two-address elimination or inline assembly constraints. Returns the 1100/// first tied use operand index by reference is UseOpIdx is not null. 1101bool MachineInstr:: 1102isRegTiedToUseOperand(unsigned DefOpIdx, unsigned *UseOpIdx) const { 1103 if (isInlineAsm()) { 1104 assert(DefOpIdx > InlineAsm::MIOp_FirstOperand); 1105 const MachineOperand &MO = getOperand(DefOpIdx); 1106 if (!MO.isReg() || !MO.isDef() || MO.getReg() == 0) 1107 return false; 1108 // Determine the actual operand index that corresponds to this index. 1109 unsigned DefNo = 0; 1110 int FlagIdx = findInlineAsmFlagIdx(DefOpIdx, &DefNo); 1111 if (FlagIdx < 0) 1112 return false; 1113 1114 // Which part of the group is DefOpIdx? 1115 unsigned DefPart = DefOpIdx - (FlagIdx + 1); 1116 1117 for (unsigned i = InlineAsm::MIOp_FirstOperand, e = getNumOperands(); 1118 i != e; ++i) { 1119 const MachineOperand &FMO = getOperand(i); 1120 if (!FMO.isImm()) 1121 continue; 1122 if (i+1 >= e || !getOperand(i+1).isReg() || !getOperand(i+1).isUse()) 1123 continue; 1124 unsigned Idx; 1125 if (InlineAsm::isUseOperandTiedToDef(FMO.getImm(), Idx) && 1126 Idx == DefNo) { 1127 if (UseOpIdx) 1128 *UseOpIdx = (unsigned)i + 1 + DefPart; 1129 return true; 1130 } 1131 } 1132 return false; 1133 } 1134 1135 assert(getOperand(DefOpIdx).isDef() && "DefOpIdx is not a def!"); 1136 const MCInstrDesc &MCID = getDesc(); 1137 for (unsigned i = 0, e = MCID.getNumOperands(); i != e; ++i) { 1138 const MachineOperand &MO = getOperand(i); 1139 if (MO.isReg() && MO.isUse() && 1140 MCID.getOperandConstraint(i, MCOI::TIED_TO) == (int)DefOpIdx) { 1141 if (UseOpIdx) 1142 *UseOpIdx = (unsigned)i; 1143 return true; 1144 } 1145 } 1146 return false; 1147} 1148 1149/// isRegTiedToDefOperand - Return true if the operand of the specified index 1150/// is a register use and it is tied to an def operand. It also returns the def 1151/// operand index by reference. 1152bool MachineInstr:: 1153isRegTiedToDefOperand(unsigned UseOpIdx, unsigned *DefOpIdx) const { 1154 if (isInlineAsm()) { 1155 const MachineOperand &MO = getOperand(UseOpIdx); 1156 if (!MO.isReg() || !MO.isUse() || MO.getReg() == 0) 1157 return false; 1158 1159 // Find the flag operand corresponding to UseOpIdx 1160 int FlagIdx = findInlineAsmFlagIdx(UseOpIdx); 1161 if (FlagIdx < 0) 1162 return false; 1163 1164 const MachineOperand &UFMO = getOperand(FlagIdx); 1165 unsigned DefNo; 1166 if (InlineAsm::isUseOperandTiedToDef(UFMO.getImm(), DefNo)) { 1167 if (!DefOpIdx) 1168 return true; 1169 1170 unsigned DefIdx = InlineAsm::MIOp_FirstOperand; 1171 // Remember to adjust the index. First operand is asm string, second is 1172 // the HasSideEffects and AlignStack bits, then there is a flag for each. 1173 while (DefNo) { 1174 const MachineOperand &FMO = getOperand(DefIdx); 1175 assert(FMO.isImm()); 1176 // Skip over this def. 1177 DefIdx += InlineAsm::getNumOperandRegisters(FMO.getImm()) + 1; 1178 --DefNo; 1179 } 1180 *DefOpIdx = DefIdx + UseOpIdx - FlagIdx; 1181 return true; 1182 } 1183 return false; 1184 } 1185 1186 const MCInstrDesc &MCID = getDesc(); 1187 if (UseOpIdx >= MCID.getNumOperands()) 1188 return false; 1189 const MachineOperand &MO = getOperand(UseOpIdx); 1190 if (!MO.isReg() || !MO.isUse()) 1191 return false; 1192 int DefIdx = MCID.getOperandConstraint(UseOpIdx, MCOI::TIED_TO); 1193 if (DefIdx == -1) 1194 return false; 1195 if (DefOpIdx) 1196 *DefOpIdx = (unsigned)DefIdx; 1197 return true; 1198} 1199 1200/// clearKillInfo - Clears kill flags on all operands. 1201/// 1202void MachineInstr::clearKillInfo() { 1203 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1204 MachineOperand &MO = getOperand(i); 1205 if (MO.isReg() && MO.isUse()) 1206 MO.setIsKill(false); 1207 } 1208} 1209 1210/// copyKillDeadInfo - Copies kill / dead operand properties from MI. 1211/// 1212void MachineInstr::copyKillDeadInfo(const MachineInstr *MI) { 1213 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 1214 const MachineOperand &MO = MI->getOperand(i); 1215 if (!MO.isReg() || (!MO.isKill() && !MO.isDead())) 1216 continue; 1217 for (unsigned j = 0, ee = getNumOperands(); j != ee; ++j) { 1218 MachineOperand &MOp = getOperand(j); 1219 if (!MOp.isIdenticalTo(MO)) 1220 continue; 1221 if (MO.isKill()) 1222 MOp.setIsKill(); 1223 else 1224 MOp.setIsDead(); 1225 break; 1226 } 1227 } 1228} 1229 1230/// copyPredicates - Copies predicate operand(s) from MI. 1231void MachineInstr::copyPredicates(const MachineInstr *MI) { 1232 assert(!isBundle() && "MachineInstr::copyPredicates() can't handle bundles"); 1233 1234 const MCInstrDesc &MCID = MI->getDesc(); 1235 if (!MCID.isPredicable()) 1236 return; 1237 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 1238 if (MCID.OpInfo[i].isPredicate()) { 1239 // Predicated operands must be last operands. 1240 addOperand(MI->getOperand(i)); 1241 } 1242 } 1243} 1244 1245void MachineInstr::substituteRegister(unsigned FromReg, 1246 unsigned ToReg, 1247 unsigned SubIdx, 1248 const TargetRegisterInfo &RegInfo) { 1249 if (TargetRegisterInfo::isPhysicalRegister(ToReg)) { 1250 if (SubIdx) 1251 ToReg = RegInfo.getSubReg(ToReg, SubIdx); 1252 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1253 MachineOperand &MO = getOperand(i); 1254 if (!MO.isReg() || MO.getReg() != FromReg) 1255 continue; 1256 MO.substPhysReg(ToReg, RegInfo); 1257 } 1258 } else { 1259 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1260 MachineOperand &MO = getOperand(i); 1261 if (!MO.isReg() || MO.getReg() != FromReg) 1262 continue; 1263 MO.substVirtReg(ToReg, SubIdx, RegInfo); 1264 } 1265 } 1266} 1267 1268/// isSafeToMove - Return true if it is safe to move this instruction. If 1269/// SawStore is set to true, it means that there is a store (or call) between 1270/// the instruction's location and its intended destination. 1271bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII, 1272 AliasAnalysis *AA, 1273 bool &SawStore) const { 1274 // Ignore stuff that we obviously can't move. 1275 if (mayStore() || isCall()) { 1276 SawStore = true; 1277 return false; 1278 } 1279 1280 if (isLabel() || isDebugValue() || 1281 isTerminator() || hasUnmodeledSideEffects()) 1282 return false; 1283 1284 // See if this instruction does a load. If so, we have to guarantee that the 1285 // loaded value doesn't change between the load and the its intended 1286 // destination. The check for isInvariantLoad gives the targe the chance to 1287 // classify the load as always returning a constant, e.g. a constant pool 1288 // load. 1289 if (mayLoad() && !isInvariantLoad(AA)) 1290 // Otherwise, this is a real load. If there is a store between the load and 1291 // end of block, or if the load is volatile, we can't move it. 1292 return !SawStore && !hasVolatileMemoryRef(); 1293 1294 return true; 1295} 1296 1297/// isSafeToReMat - Return true if it's safe to rematerialize the specified 1298/// instruction which defined the specified register instead of copying it. 1299bool MachineInstr::isSafeToReMat(const TargetInstrInfo *TII, 1300 AliasAnalysis *AA, 1301 unsigned DstReg) const { 1302 bool SawStore = false; 1303 if (!TII->isTriviallyReMaterializable(this, AA) || 1304 !isSafeToMove(TII, AA, SawStore)) 1305 return false; 1306 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1307 const MachineOperand &MO = getOperand(i); 1308 if (!MO.isReg()) 1309 continue; 1310 // FIXME: For now, do not remat any instruction with register operands. 1311 // Later on, we can loosen the restriction is the register operands have 1312 // not been modified between the def and use. Note, this is different from 1313 // MachineSink because the code is no longer in two-address form (at least 1314 // partially). 1315 if (MO.isUse()) 1316 return false; 1317 else if (!MO.isDead() && MO.getReg() != DstReg) 1318 return false; 1319 } 1320 return true; 1321} 1322 1323/// hasVolatileMemoryRef - Return true if this instruction may have a 1324/// volatile memory reference, or if the information describing the 1325/// memory reference is not available. Return false if it is known to 1326/// have no volatile memory references. 1327bool MachineInstr::hasVolatileMemoryRef() const { 1328 // An instruction known never to access memory won't have a volatile access. 1329 if (!mayStore() && 1330 !mayLoad() && 1331 !isCall() && 1332 !hasUnmodeledSideEffects()) 1333 return false; 1334 1335 // Otherwise, if the instruction has no memory reference information, 1336 // conservatively assume it wasn't preserved. 1337 if (memoperands_empty()) 1338 return true; 1339 1340 // Check the memory reference information for volatile references. 1341 for (mmo_iterator I = memoperands_begin(), E = memoperands_end(); I != E; ++I) 1342 if ((*I)->isVolatile()) 1343 return true; 1344 1345 return false; 1346} 1347 1348/// isInvariantLoad - Return true if this instruction is loading from a 1349/// location whose value is invariant across the function. For example, 1350/// loading a value from the constant pool or from the argument area 1351/// of a function if it does not change. This should only return true of 1352/// *all* loads the instruction does are invariant (if it does multiple loads). 1353bool MachineInstr::isInvariantLoad(AliasAnalysis *AA) const { 1354 // If the instruction doesn't load at all, it isn't an invariant load. 1355 if (!mayLoad()) 1356 return false; 1357 1358 // If the instruction has lost its memoperands, conservatively assume that 1359 // it may not be an invariant load. 1360 if (memoperands_empty()) 1361 return false; 1362 1363 const MachineFrameInfo *MFI = getParent()->getParent()->getFrameInfo(); 1364 1365 for (mmo_iterator I = memoperands_begin(), 1366 E = memoperands_end(); I != E; ++I) { 1367 if ((*I)->isVolatile()) return false; 1368 if ((*I)->isStore()) return false; 1369 if ((*I)->isInvariant()) return true; 1370 1371 if (const Value *V = (*I)->getValue()) { 1372 // A load from a constant PseudoSourceValue is invariant. 1373 if (const PseudoSourceValue *PSV = dyn_cast<PseudoSourceValue>(V)) 1374 if (PSV->isConstant(MFI)) 1375 continue; 1376 // If we have an AliasAnalysis, ask it whether the memory is constant. 1377 if (AA && AA->pointsToConstantMemory( 1378 AliasAnalysis::Location(V, (*I)->getSize(), 1379 (*I)->getTBAAInfo()))) 1380 continue; 1381 } 1382 1383 // Otherwise assume conservatively. 1384 return false; 1385 } 1386 1387 // Everything checks out. 1388 return true; 1389} 1390 1391/// isConstantValuePHI - If the specified instruction is a PHI that always 1392/// merges together the same virtual register, return the register, otherwise 1393/// return 0. 1394unsigned MachineInstr::isConstantValuePHI() const { 1395 if (!isPHI()) 1396 return 0; 1397 assert(getNumOperands() >= 3 && 1398 "It's illegal to have a PHI without source operands"); 1399 1400 unsigned Reg = getOperand(1).getReg(); 1401 for (unsigned i = 3, e = getNumOperands(); i < e; i += 2) 1402 if (getOperand(i).getReg() != Reg) 1403 return 0; 1404 return Reg; 1405} 1406 1407bool MachineInstr::hasUnmodeledSideEffects() const { 1408 if (hasProperty(MCID::UnmodeledSideEffects)) 1409 return true; 1410 if (isInlineAsm()) { 1411 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm(); 1412 if (ExtraInfo & InlineAsm::Extra_HasSideEffects) 1413 return true; 1414 } 1415 1416 return false; 1417} 1418 1419/// allDefsAreDead - Return true if all the defs of this instruction are dead. 1420/// 1421bool MachineInstr::allDefsAreDead() const { 1422 for (unsigned i = 0, e = getNumOperands(); i < e; ++i) { 1423 const MachineOperand &MO = getOperand(i); 1424 if (!MO.isReg() || MO.isUse()) 1425 continue; 1426 if (!MO.isDead()) 1427 return false; 1428 } 1429 return true; 1430} 1431 1432/// copyImplicitOps - Copy implicit register operands from specified 1433/// instruction to this instruction. 1434void MachineInstr::copyImplicitOps(const MachineInstr *MI) { 1435 for (unsigned i = MI->getDesc().getNumOperands(), e = MI->getNumOperands(); 1436 i != e; ++i) { 1437 const MachineOperand &MO = MI->getOperand(i); 1438 if (MO.isReg() && MO.isImplicit()) 1439 addOperand(MO); 1440 } 1441} 1442 1443void MachineInstr::dump() const { 1444 dbgs() << " " << *this; 1445} 1446 1447static void printDebugLoc(DebugLoc DL, const MachineFunction *MF, 1448 raw_ostream &CommentOS) { 1449 const LLVMContext &Ctx = MF->getFunction()->getContext(); 1450 if (!DL.isUnknown()) { // Print source line info. 1451 DIScope Scope(DL.getScope(Ctx)); 1452 // Omit the directory, because it's likely to be long and uninteresting. 1453 if (Scope.Verify()) 1454 CommentOS << Scope.getFilename(); 1455 else 1456 CommentOS << "<unknown>"; 1457 CommentOS << ':' << DL.getLine(); 1458 if (DL.getCol() != 0) 1459 CommentOS << ':' << DL.getCol(); 1460 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(DL.getInlinedAt(Ctx)); 1461 if (!InlinedAtDL.isUnknown()) { 1462 CommentOS << " @[ "; 1463 printDebugLoc(InlinedAtDL, MF, CommentOS); 1464 CommentOS << " ]"; 1465 } 1466 } 1467} 1468 1469void MachineInstr::print(raw_ostream &OS, const TargetMachine *TM) const { 1470 // We can be a bit tidier if we know the TargetMachine and/or MachineFunction. 1471 const MachineFunction *MF = 0; 1472 const MachineRegisterInfo *MRI = 0; 1473 if (const MachineBasicBlock *MBB = getParent()) { 1474 MF = MBB->getParent(); 1475 if (!TM && MF) 1476 TM = &MF->getTarget(); 1477 if (MF) 1478 MRI = &MF->getRegInfo(); 1479 } 1480 1481 // Save a list of virtual registers. 1482 SmallVector<unsigned, 8> VirtRegs; 1483 1484 // Print explicitly defined operands on the left of an assignment syntax. 1485 unsigned StartOp = 0, e = getNumOperands(); 1486 for (; StartOp < e && getOperand(StartOp).isReg() && 1487 getOperand(StartOp).isDef() && 1488 !getOperand(StartOp).isImplicit(); 1489 ++StartOp) { 1490 if (StartOp != 0) OS << ", "; 1491 getOperand(StartOp).print(OS, TM); 1492 unsigned Reg = getOperand(StartOp).getReg(); 1493 if (TargetRegisterInfo::isVirtualRegister(Reg)) 1494 VirtRegs.push_back(Reg); 1495 } 1496 1497 if (StartOp != 0) 1498 OS << " = "; 1499 1500 // Print the opcode name. 1501 if (TM && TM->getInstrInfo()) 1502 OS << TM->getInstrInfo()->getName(getOpcode()); 1503 else 1504 OS << "UNKNOWN"; 1505 1506 // Print the rest of the operands. 1507 bool OmittedAnyCallClobbers = false; 1508 bool FirstOp = true; 1509 unsigned AsmDescOp = ~0u; 1510 unsigned AsmOpCount = 0; 1511 1512 if (isInlineAsm() && e >= InlineAsm::MIOp_FirstOperand) { 1513 // Print asm string. 1514 OS << " "; 1515 getOperand(InlineAsm::MIOp_AsmString).print(OS, TM); 1516 1517 // Print HasSideEffects, IsAlignStack 1518 unsigned ExtraInfo = getOperand(InlineAsm::MIOp_ExtraInfo).getImm(); 1519 if (ExtraInfo & InlineAsm::Extra_HasSideEffects) 1520 OS << " [sideeffect]"; 1521 if (ExtraInfo & InlineAsm::Extra_IsAlignStack) 1522 OS << " [alignstack]"; 1523 1524 StartOp = AsmDescOp = InlineAsm::MIOp_FirstOperand; 1525 FirstOp = false; 1526 } 1527 1528 1529 for (unsigned i = StartOp, e = getNumOperands(); i != e; ++i) { 1530 const MachineOperand &MO = getOperand(i); 1531 1532 if (MO.isReg() && TargetRegisterInfo::isVirtualRegister(MO.getReg())) 1533 VirtRegs.push_back(MO.getReg()); 1534 1535 // Omit call-clobbered registers which aren't used anywhere. This makes 1536 // call instructions much less noisy on targets where calls clobber lots 1537 // of registers. Don't rely on MO.isDead() because we may be called before 1538 // LiveVariables is run, or we may be looking at a non-allocatable reg. 1539 if (MF && isCall() && 1540 MO.isReg() && MO.isImplicit() && MO.isDef()) { 1541 unsigned Reg = MO.getReg(); 1542 if (TargetRegisterInfo::isPhysicalRegister(Reg)) { 1543 const MachineRegisterInfo &MRI = MF->getRegInfo(); 1544 if (MRI.use_empty(Reg) && !MRI.isLiveOut(Reg)) { 1545 bool HasAliasLive = false; 1546 for (const unsigned *Alias = TM->getRegisterInfo()->getAliasSet(Reg); 1547 unsigned AliasReg = *Alias; ++Alias) 1548 if (!MRI.use_empty(AliasReg) || MRI.isLiveOut(AliasReg)) { 1549 HasAliasLive = true; 1550 break; 1551 } 1552 if (!HasAliasLive) { 1553 OmittedAnyCallClobbers = true; 1554 continue; 1555 } 1556 } 1557 } 1558 } 1559 1560 if (FirstOp) FirstOp = false; else OS << ","; 1561 OS << " "; 1562 if (i < getDesc().NumOperands) { 1563 const MCOperandInfo &MCOI = getDesc().OpInfo[i]; 1564 if (MCOI.isPredicate()) 1565 OS << "pred:"; 1566 if (MCOI.isOptionalDef()) 1567 OS << "opt:"; 1568 } 1569 if (isDebugValue() && MO.isMetadata()) { 1570 // Pretty print DBG_VALUE instructions. 1571 const MDNode *MD = MO.getMetadata(); 1572 if (const MDString *MDS = dyn_cast<MDString>(MD->getOperand(2))) 1573 OS << "!\"" << MDS->getString() << '\"'; 1574 else 1575 MO.print(OS, TM); 1576 } else if (TM && (isInsertSubreg() || isRegSequence()) && MO.isImm()) { 1577 OS << TM->getRegisterInfo()->getSubRegIndexName(MO.getImm()); 1578 } else if (i == AsmDescOp && MO.isImm()) { 1579 // Pretty print the inline asm operand descriptor. 1580 OS << '$' << AsmOpCount++; 1581 unsigned Flag = MO.getImm(); 1582 switch (InlineAsm::getKind(Flag)) { 1583 case InlineAsm::Kind_RegUse: OS << ":[reguse"; break; 1584 case InlineAsm::Kind_RegDef: OS << ":[regdef"; break; 1585 case InlineAsm::Kind_RegDefEarlyClobber: OS << ":[regdef-ec"; break; 1586 case InlineAsm::Kind_Clobber: OS << ":[clobber"; break; 1587 case InlineAsm::Kind_Imm: OS << ":[imm"; break; 1588 case InlineAsm::Kind_Mem: OS << ":[mem"; break; 1589 default: OS << ":[??" << InlineAsm::getKind(Flag); break; 1590 } 1591 1592 unsigned RCID = 0; 1593 if (InlineAsm::hasRegClassConstraint(Flag, RCID)) { 1594 if (TM) 1595 OS << ':' << TM->getRegisterInfo()->getRegClass(RCID)->getName(); 1596 else 1597 OS << ":RC" << RCID; 1598 } 1599 1600 unsigned TiedTo = 0; 1601 if (InlineAsm::isUseOperandTiedToDef(Flag, TiedTo)) 1602 OS << " tiedto:$" << TiedTo; 1603 1604 OS << ']'; 1605 1606 // Compute the index of the next operand descriptor. 1607 AsmDescOp += 1 + InlineAsm::getNumOperandRegisters(Flag); 1608 } else 1609 MO.print(OS, TM); 1610 } 1611 1612 // Briefly indicate whether any call clobbers were omitted. 1613 if (OmittedAnyCallClobbers) { 1614 if (!FirstOp) OS << ","; 1615 OS << " ..."; 1616 } 1617 1618 bool HaveSemi = false; 1619 if (Flags) { 1620 if (!HaveSemi) OS << ";"; HaveSemi = true; 1621 OS << " flags: "; 1622 1623 if (Flags & FrameSetup) 1624 OS << "FrameSetup"; 1625 } 1626 1627 if (!memoperands_empty()) { 1628 if (!HaveSemi) OS << ";"; HaveSemi = true; 1629 1630 OS << " mem:"; 1631 for (mmo_iterator i = memoperands_begin(), e = memoperands_end(); 1632 i != e; ++i) { 1633 OS << **i; 1634 if (llvm::next(i) != e) 1635 OS << " "; 1636 } 1637 } 1638 1639 // Print the regclass of any virtual registers encountered. 1640 if (MRI && !VirtRegs.empty()) { 1641 if (!HaveSemi) OS << ";"; HaveSemi = true; 1642 for (unsigned i = 0; i != VirtRegs.size(); ++i) { 1643 const TargetRegisterClass *RC = MRI->getRegClass(VirtRegs[i]); 1644 OS << " " << RC->getName() << ':' << PrintReg(VirtRegs[i]); 1645 for (unsigned j = i+1; j != VirtRegs.size();) { 1646 if (MRI->getRegClass(VirtRegs[j]) != RC) { 1647 ++j; 1648 continue; 1649 } 1650 if (VirtRegs[i] != VirtRegs[j]) 1651 OS << "," << PrintReg(VirtRegs[j]); 1652 VirtRegs.erase(VirtRegs.begin()+j); 1653 } 1654 } 1655 } 1656 1657 // Print debug location information. 1658 if (isDebugValue() && getOperand(e - 1).isMetadata()) { 1659 if (!HaveSemi) OS << ";"; HaveSemi = true; 1660 DIVariable DV(getOperand(e - 1).getMetadata()); 1661 OS << " line no:" << DV.getLineNumber(); 1662 if (MDNode *InlinedAt = DV.getInlinedAt()) { 1663 DebugLoc InlinedAtDL = DebugLoc::getFromDILocation(InlinedAt); 1664 if (!InlinedAtDL.isUnknown()) { 1665 OS << " inlined @[ "; 1666 printDebugLoc(InlinedAtDL, MF, OS); 1667 OS << " ]"; 1668 } 1669 } 1670 } else if (!debugLoc.isUnknown() && MF) { 1671 if (!HaveSemi) OS << ";"; HaveSemi = true; 1672 OS << " dbg:"; 1673 printDebugLoc(debugLoc, MF, OS); 1674 } 1675 1676 OS << '\n'; 1677} 1678 1679bool MachineInstr::addRegisterKilled(unsigned IncomingReg, 1680 const TargetRegisterInfo *RegInfo, 1681 bool AddIfNotFound) { 1682 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg); 1683 bool hasAliases = isPhysReg && RegInfo->getAliasSet(IncomingReg); 1684 bool Found = false; 1685 SmallVector<unsigned,4> DeadOps; 1686 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1687 MachineOperand &MO = getOperand(i); 1688 if (!MO.isReg() || !MO.isUse() || MO.isUndef()) 1689 continue; 1690 unsigned Reg = MO.getReg(); 1691 if (!Reg) 1692 continue; 1693 1694 if (Reg == IncomingReg) { 1695 if (!Found) { 1696 if (MO.isKill()) 1697 // The register is already marked kill. 1698 return true; 1699 if (isPhysReg && isRegTiedToDefOperand(i)) 1700 // Two-address uses of physregs must not be marked kill. 1701 return true; 1702 MO.setIsKill(); 1703 Found = true; 1704 } 1705 } else if (hasAliases && MO.isKill() && 1706 TargetRegisterInfo::isPhysicalRegister(Reg)) { 1707 // A super-register kill already exists. 1708 if (RegInfo->isSuperRegister(IncomingReg, Reg)) 1709 return true; 1710 if (RegInfo->isSubRegister(IncomingReg, Reg)) 1711 DeadOps.push_back(i); 1712 } 1713 } 1714 1715 // Trim unneeded kill operands. 1716 while (!DeadOps.empty()) { 1717 unsigned OpIdx = DeadOps.back(); 1718 if (getOperand(OpIdx).isImplicit()) 1719 RemoveOperand(OpIdx); 1720 else 1721 getOperand(OpIdx).setIsKill(false); 1722 DeadOps.pop_back(); 1723 } 1724 1725 // If not found, this means an alias of one of the operands is killed. Add a 1726 // new implicit operand if required. 1727 if (!Found && AddIfNotFound) { 1728 addOperand(MachineOperand::CreateReg(IncomingReg, 1729 false /*IsDef*/, 1730 true /*IsImp*/, 1731 true /*IsKill*/)); 1732 return true; 1733 } 1734 return Found; 1735} 1736 1737void MachineInstr::clearRegisterKills(unsigned Reg, 1738 const TargetRegisterInfo *RegInfo) { 1739 if (!TargetRegisterInfo::isPhysicalRegister(Reg)) 1740 RegInfo = 0; 1741 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1742 MachineOperand &MO = getOperand(i); 1743 if (!MO.isReg() || !MO.isUse() || !MO.isKill()) 1744 continue; 1745 unsigned OpReg = MO.getReg(); 1746 if (OpReg == Reg || (RegInfo && RegInfo->isSuperRegister(Reg, OpReg))) 1747 MO.setIsKill(false); 1748 } 1749} 1750 1751bool MachineInstr::addRegisterDead(unsigned IncomingReg, 1752 const TargetRegisterInfo *RegInfo, 1753 bool AddIfNotFound) { 1754 bool isPhysReg = TargetRegisterInfo::isPhysicalRegister(IncomingReg); 1755 bool hasAliases = isPhysReg && RegInfo->getAliasSet(IncomingReg); 1756 bool Found = false; 1757 SmallVector<unsigned,4> DeadOps; 1758 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1759 MachineOperand &MO = getOperand(i); 1760 if (!MO.isReg() || !MO.isDef()) 1761 continue; 1762 unsigned Reg = MO.getReg(); 1763 if (!Reg) 1764 continue; 1765 1766 if (Reg == IncomingReg) { 1767 MO.setIsDead(); 1768 Found = true; 1769 } else if (hasAliases && MO.isDead() && 1770 TargetRegisterInfo::isPhysicalRegister(Reg)) { 1771 // There exists a super-register that's marked dead. 1772 if (RegInfo->isSuperRegister(IncomingReg, Reg)) 1773 return true; 1774 if (RegInfo->getSubRegisters(IncomingReg) && 1775 RegInfo->getSuperRegisters(Reg) && 1776 RegInfo->isSubRegister(IncomingReg, Reg)) 1777 DeadOps.push_back(i); 1778 } 1779 } 1780 1781 // Trim unneeded dead operands. 1782 while (!DeadOps.empty()) { 1783 unsigned OpIdx = DeadOps.back(); 1784 if (getOperand(OpIdx).isImplicit()) 1785 RemoveOperand(OpIdx); 1786 else 1787 getOperand(OpIdx).setIsDead(false); 1788 DeadOps.pop_back(); 1789 } 1790 1791 // If not found, this means an alias of one of the operands is dead. Add a 1792 // new implicit operand if required. 1793 if (Found || !AddIfNotFound) 1794 return Found; 1795 1796 addOperand(MachineOperand::CreateReg(IncomingReg, 1797 true /*IsDef*/, 1798 true /*IsImp*/, 1799 false /*IsKill*/, 1800 true /*IsDead*/)); 1801 return true; 1802} 1803 1804void MachineInstr::addRegisterDefined(unsigned IncomingReg, 1805 const TargetRegisterInfo *RegInfo) { 1806 if (TargetRegisterInfo::isPhysicalRegister(IncomingReg)) { 1807 MachineOperand *MO = findRegisterDefOperand(IncomingReg, false, RegInfo); 1808 if (MO) 1809 return; 1810 } else { 1811 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1812 const MachineOperand &MO = getOperand(i); 1813 if (MO.isReg() && MO.getReg() == IncomingReg && MO.isDef() && 1814 MO.getSubReg() == 0) 1815 return; 1816 } 1817 } 1818 addOperand(MachineOperand::CreateReg(IncomingReg, 1819 true /*IsDef*/, 1820 true /*IsImp*/)); 1821} 1822 1823void MachineInstr::setPhysRegsDeadExcept(ArrayRef<unsigned> UsedRegs, 1824 const TargetRegisterInfo &TRI) { 1825 bool HasRegMask = false; 1826 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) { 1827 MachineOperand &MO = getOperand(i); 1828 if (MO.isRegMask()) { 1829 HasRegMask = true; 1830 continue; 1831 } 1832 if (!MO.isReg() || !MO.isDef()) continue; 1833 unsigned Reg = MO.getReg(); 1834 if (!TargetRegisterInfo::isPhysicalRegister(Reg)) continue; 1835 bool Dead = true; 1836 for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end(); 1837 I != E; ++I) 1838 if (TRI.regsOverlap(*I, Reg)) { 1839 Dead = false; 1840 break; 1841 } 1842 // If there are no uses, including partial uses, the def is dead. 1843 if (Dead) MO.setIsDead(); 1844 } 1845 1846 // This is a call with a register mask operand. 1847 // Mask clobbers are always dead, so add defs for the non-dead defines. 1848 if (HasRegMask) 1849 for (ArrayRef<unsigned>::iterator I = UsedRegs.begin(), E = UsedRegs.end(); 1850 I != E; ++I) 1851 addRegisterDefined(*I, &TRI); 1852} 1853 1854unsigned 1855MachineInstrExpressionTrait::getHashValue(const MachineInstr* const &MI) { 1856 unsigned Hash = MI->getOpcode() * 37; 1857 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { 1858 const MachineOperand &MO = MI->getOperand(i); 1859 uint64_t Key = (uint64_t)MO.getType() << 32; 1860 switch (MO.getType()) { 1861 default: break; 1862 case MachineOperand::MO_Register: 1863 if (MO.isDef() && TargetRegisterInfo::isVirtualRegister(MO.getReg())) 1864 continue; // Skip virtual register defs. 1865 Key |= MO.getReg(); 1866 break; 1867 case MachineOperand::MO_Immediate: 1868 Key |= MO.getImm(); 1869 break; 1870 case MachineOperand::MO_FrameIndex: 1871 case MachineOperand::MO_ConstantPoolIndex: 1872 case MachineOperand::MO_JumpTableIndex: 1873 Key |= MO.getIndex(); 1874 break; 1875 case MachineOperand::MO_MachineBasicBlock: 1876 Key |= DenseMapInfo<void*>::getHashValue(MO.getMBB()); 1877 break; 1878 case MachineOperand::MO_GlobalAddress: 1879 Key |= DenseMapInfo<void*>::getHashValue(MO.getGlobal()); 1880 break; 1881 case MachineOperand::MO_BlockAddress: 1882 Key |= DenseMapInfo<void*>::getHashValue(MO.getBlockAddress()); 1883 break; 1884 case MachineOperand::MO_MCSymbol: 1885 Key |= DenseMapInfo<void*>::getHashValue(MO.getMCSymbol()); 1886 break; 1887 } 1888 Key += ~(Key << 32); 1889 Key ^= (Key >> 22); 1890 Key += ~(Key << 13); 1891 Key ^= (Key >> 8); 1892 Key += (Key << 3); 1893 Key ^= (Key >> 15); 1894 Key += ~(Key << 27); 1895 Key ^= (Key >> 31); 1896 Hash = (unsigned)Key + Hash * 37; 1897 } 1898 return Hash; 1899} 1900 1901void MachineInstr::emitError(StringRef Msg) const { 1902 // Find the source location cookie. 1903 unsigned LocCookie = 0; 1904 const MDNode *LocMD = 0; 1905 for (unsigned i = getNumOperands(); i != 0; --i) { 1906 if (getOperand(i-1).isMetadata() && 1907 (LocMD = getOperand(i-1).getMetadata()) && 1908 LocMD->getNumOperands() != 0) { 1909 if (const ConstantInt *CI = dyn_cast<ConstantInt>(LocMD->getOperand(0))) { 1910 LocCookie = CI->getZExtValue(); 1911 break; 1912 } 1913 } 1914 } 1915 1916 if (const MachineBasicBlock *MBB = getParent()) 1917 if (const MachineFunction *MF = MBB->getParent()) 1918 return MF->getMMI().getModule()->getContext().emitError(LocCookie, Msg); 1919 report_fatal_error(Msg); 1920} 1921