MachineFunction.cpp revision 199481
1//===-- MachineFunction.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// Collect native machine code information for a function. This allows 11// target-specific information about the generated code to be stored with each 12// function. 13// 14//===----------------------------------------------------------------------===// 15 16#include "llvm/DerivedTypes.h" 17#include "llvm/Function.h" 18#include "llvm/Instructions.h" 19#include "llvm/ADT/STLExtras.h" 20#include "llvm/Config/config.h" 21#include "llvm/CodeGen/MachineConstantPool.h" 22#include "llvm/CodeGen/MachineFunction.h" 23#include "llvm/CodeGen/MachineFunctionPass.h" 24#include "llvm/CodeGen/MachineFrameInfo.h" 25#include "llvm/CodeGen/MachineInstr.h" 26#include "llvm/CodeGen/MachineJumpTableInfo.h" 27#include "llvm/CodeGen/MachineRegisterInfo.h" 28#include "llvm/CodeGen/Passes.h" 29#include "llvm/Target/TargetData.h" 30#include "llvm/Target/TargetLowering.h" 31#include "llvm/Target/TargetMachine.h" 32#include "llvm/Target/TargetFrameInfo.h" 33#include "llvm/Support/GraphWriter.h" 34#include "llvm/Support/raw_ostream.h" 35using namespace llvm; 36 37namespace { 38 struct Printer : public MachineFunctionPass { 39 static char ID; 40 41 raw_ostream &OS; 42 const std::string Banner; 43 44 Printer(raw_ostream &os, const std::string &banner) 45 : MachineFunctionPass(&ID), OS(os), Banner(banner) {} 46 47 const char *getPassName() const { return "MachineFunction Printer"; } 48 49 virtual void getAnalysisUsage(AnalysisUsage &AU) const { 50 AU.setPreservesAll(); 51 MachineFunctionPass::getAnalysisUsage(AU); 52 } 53 54 bool runOnMachineFunction(MachineFunction &MF) { 55 OS << "# " << Banner << ":\n"; 56 MF.print(OS); 57 return false; 58 } 59 }; 60 char Printer::ID = 0; 61} 62 63/// Returns a newly-created MachineFunction Printer pass. The default banner is 64/// empty. 65/// 66FunctionPass *llvm::createMachineFunctionPrinterPass(raw_ostream &OS, 67 const std::string &Banner){ 68 return new Printer(OS, Banner); 69} 70 71//===---------------------------------------------------------------------===// 72// MachineFunction implementation 73//===---------------------------------------------------------------------===// 74 75// Out of line virtual method. 76MachineFunctionInfo::~MachineFunctionInfo() {} 77 78void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) { 79 MBB->getParent()->DeleteMachineBasicBlock(MBB); 80} 81 82MachineFunction::MachineFunction(Function *F, 83 const TargetMachine &TM) 84 : Fn(F), Target(TM) { 85 if (TM.getRegisterInfo()) 86 RegInfo = new (Allocator.Allocate<MachineRegisterInfo>()) 87 MachineRegisterInfo(*TM.getRegisterInfo()); 88 else 89 RegInfo = 0; 90 MFInfo = 0; 91 FrameInfo = new (Allocator.Allocate<MachineFrameInfo>()) 92 MachineFrameInfo(*TM.getFrameInfo()); 93 ConstantPool = new (Allocator.Allocate<MachineConstantPool>()) 94 MachineConstantPool(TM.getTargetData()); 95 Alignment = TM.getTargetLowering()->getFunctionAlignment(F); 96 97 // Set up jump table. 98 const TargetData &TD = *TM.getTargetData(); 99 bool IsPic = TM.getRelocationModel() == Reloc::PIC_; 100 unsigned EntrySize = IsPic ? 4 : TD.getPointerSize(); 101 unsigned TyAlignment = IsPic ? 102 TD.getABITypeAlignment(Type::getInt32Ty(F->getContext())) 103 : TD.getPointerABIAlignment(); 104 JumpTableInfo = new (Allocator.Allocate<MachineJumpTableInfo>()) 105 MachineJumpTableInfo(EntrySize, TyAlignment); 106} 107 108MachineFunction::~MachineFunction() { 109 BasicBlocks.clear(); 110 InstructionRecycler.clear(Allocator); 111 BasicBlockRecycler.clear(Allocator); 112 if (RegInfo) { 113 RegInfo->~MachineRegisterInfo(); 114 Allocator.Deallocate(RegInfo); 115 } 116 if (MFInfo) { 117 MFInfo->~MachineFunctionInfo(); 118 Allocator.Deallocate(MFInfo); 119 } 120 FrameInfo->~MachineFrameInfo(); Allocator.Deallocate(FrameInfo); 121 ConstantPool->~MachineConstantPool(); Allocator.Deallocate(ConstantPool); 122 JumpTableInfo->~MachineJumpTableInfo(); Allocator.Deallocate(JumpTableInfo); 123} 124 125 126/// RenumberBlocks - This discards all of the MachineBasicBlock numbers and 127/// recomputes them. This guarantees that the MBB numbers are sequential, 128/// dense, and match the ordering of the blocks within the function. If a 129/// specific MachineBasicBlock is specified, only that block and those after 130/// it are renumbered. 131void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) { 132 if (empty()) { MBBNumbering.clear(); return; } 133 MachineFunction::iterator MBBI, E = end(); 134 if (MBB == 0) 135 MBBI = begin(); 136 else 137 MBBI = MBB; 138 139 // Figure out the block number this should have. 140 unsigned BlockNo = 0; 141 if (MBBI != begin()) 142 BlockNo = prior(MBBI)->getNumber()+1; 143 144 for (; MBBI != E; ++MBBI, ++BlockNo) { 145 if (MBBI->getNumber() != (int)BlockNo) { 146 // Remove use of the old number. 147 if (MBBI->getNumber() != -1) { 148 assert(MBBNumbering[MBBI->getNumber()] == &*MBBI && 149 "MBB number mismatch!"); 150 MBBNumbering[MBBI->getNumber()] = 0; 151 } 152 153 // If BlockNo is already taken, set that block's number to -1. 154 if (MBBNumbering[BlockNo]) 155 MBBNumbering[BlockNo]->setNumber(-1); 156 157 MBBNumbering[BlockNo] = MBBI; 158 MBBI->setNumber(BlockNo); 159 } 160 } 161 162 // Okay, all the blocks are renumbered. If we have compactified the block 163 // numbering, shrink MBBNumbering now. 164 assert(BlockNo <= MBBNumbering.size() && "Mismatch!"); 165 MBBNumbering.resize(BlockNo); 166} 167 168/// CreateMachineInstr - Allocate a new MachineInstr. Use this instead 169/// of `new MachineInstr'. 170/// 171MachineInstr * 172MachineFunction::CreateMachineInstr(const TargetInstrDesc &TID, 173 DebugLoc DL, bool NoImp) { 174 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator)) 175 MachineInstr(TID, DL, NoImp); 176} 177 178/// CloneMachineInstr - Create a new MachineInstr which is a copy of the 179/// 'Orig' instruction, identical in all ways except the the instruction 180/// has no parent, prev, or next. 181/// 182MachineInstr * 183MachineFunction::CloneMachineInstr(const MachineInstr *Orig) { 184 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator)) 185 MachineInstr(*this, *Orig); 186} 187 188/// DeleteMachineInstr - Delete the given MachineInstr. 189/// 190void 191MachineFunction::DeleteMachineInstr(MachineInstr *MI) { 192 MI->~MachineInstr(); 193 InstructionRecycler.Deallocate(Allocator, MI); 194} 195 196/// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this 197/// instead of `new MachineBasicBlock'. 198/// 199MachineBasicBlock * 200MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) { 201 return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator)) 202 MachineBasicBlock(*this, bb); 203} 204 205/// DeleteMachineBasicBlock - Delete the given MachineBasicBlock. 206/// 207void 208MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) { 209 assert(MBB->getParent() == this && "MBB parent mismatch!"); 210 MBB->~MachineBasicBlock(); 211 BasicBlockRecycler.Deallocate(Allocator, MBB); 212} 213 214MachineMemOperand * 215MachineFunction::getMachineMemOperand(const Value *v, unsigned f, 216 int64_t o, uint64_t s, 217 unsigned base_alignment) { 218 return new (Allocator.Allocate<MachineMemOperand>()) 219 MachineMemOperand(v, f, o, s, base_alignment); 220} 221 222MachineMemOperand * 223MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO, 224 int64_t Offset, uint64_t Size) { 225 return new (Allocator.Allocate<MachineMemOperand>()) 226 MachineMemOperand(MMO->getValue(), MMO->getFlags(), 227 int64_t(uint64_t(MMO->getOffset()) + 228 uint64_t(Offset)), 229 Size, MMO->getBaseAlignment()); 230} 231 232MachineInstr::mmo_iterator 233MachineFunction::allocateMemRefsArray(unsigned long Num) { 234 return Allocator.Allocate<MachineMemOperand *>(Num); 235} 236 237std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator> 238MachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin, 239 MachineInstr::mmo_iterator End) { 240 // Count the number of load mem refs. 241 unsigned Num = 0; 242 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) 243 if ((*I)->isLoad()) 244 ++Num; 245 246 // Allocate a new array and populate it with the load information. 247 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num); 248 unsigned Index = 0; 249 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) { 250 if ((*I)->isLoad()) { 251 if (!(*I)->isStore()) 252 // Reuse the MMO. 253 Result[Index] = *I; 254 else { 255 // Clone the MMO and unset the store flag. 256 MachineMemOperand *JustLoad = 257 getMachineMemOperand((*I)->getValue(), 258 (*I)->getFlags() & ~MachineMemOperand::MOStore, 259 (*I)->getOffset(), (*I)->getSize(), 260 (*I)->getBaseAlignment()); 261 Result[Index] = JustLoad; 262 } 263 ++Index; 264 } 265 } 266 return std::make_pair(Result, Result + Num); 267} 268 269std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator> 270MachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin, 271 MachineInstr::mmo_iterator End) { 272 // Count the number of load mem refs. 273 unsigned Num = 0; 274 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) 275 if ((*I)->isStore()) 276 ++Num; 277 278 // Allocate a new array and populate it with the store information. 279 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num); 280 unsigned Index = 0; 281 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) { 282 if ((*I)->isStore()) { 283 if (!(*I)->isLoad()) 284 // Reuse the MMO. 285 Result[Index] = *I; 286 else { 287 // Clone the MMO and unset the load flag. 288 MachineMemOperand *JustStore = 289 getMachineMemOperand((*I)->getValue(), 290 (*I)->getFlags() & ~MachineMemOperand::MOLoad, 291 (*I)->getOffset(), (*I)->getSize(), 292 (*I)->getBaseAlignment()); 293 Result[Index] = JustStore; 294 } 295 ++Index; 296 } 297 } 298 return std::make_pair(Result, Result + Num); 299} 300 301void MachineFunction::dump() const { 302 print(errs()); 303} 304 305void MachineFunction::print(raw_ostream &OS) const { 306 OS << "# Machine code for function " << Fn->getName() << ":\n"; 307 308 // Print Frame Information 309 FrameInfo->print(*this, OS); 310 311 // Print JumpTable Information 312 JumpTableInfo->print(OS); 313 314 // Print Constant Pool 315 ConstantPool->print(OS); 316 317 const TargetRegisterInfo *TRI = getTarget().getRegisterInfo(); 318 319 if (RegInfo && !RegInfo->livein_empty()) { 320 OS << "Function Live Ins: "; 321 for (MachineRegisterInfo::livein_iterator 322 I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) { 323 if (TRI) 324 OS << "%" << TRI->getName(I->first); 325 else 326 OS << " %physreg" << I->first; 327 328 if (I->second) 329 OS << " in reg%" << I->second; 330 331 if (next(I) != E) 332 OS << ", "; 333 } 334 OS << '\n'; 335 } 336 if (RegInfo && !RegInfo->liveout_empty()) { 337 OS << "Function Live Outs: "; 338 for (MachineRegisterInfo::liveout_iterator 339 I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I){ 340 if (TRI) 341 OS << '%' << TRI->getName(*I); 342 else 343 OS << "%physreg" << *I; 344 345 if (next(I) != E) 346 OS << " "; 347 } 348 OS << '\n'; 349 } 350 351 for (const_iterator BB = begin(), E = end(); BB != E; ++BB) { 352 OS << '\n'; 353 BB->print(OS); 354 } 355 356 OS << "\n# End machine code for function " << Fn->getName() << ".\n\n"; 357} 358 359namespace llvm { 360 template<> 361 struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits { 362 static std::string getGraphName(const MachineFunction *F) { 363 return "CFG for '" + F->getFunction()->getNameStr() + "' function"; 364 } 365 366 static std::string getNodeLabel(const MachineBasicBlock *Node, 367 const MachineFunction *Graph, 368 bool ShortNames) { 369 if (ShortNames && Node->getBasicBlock() && 370 !Node->getBasicBlock()->getName().empty()) 371 return Node->getBasicBlock()->getNameStr() + ":"; 372 373 std::string OutStr; 374 { 375 raw_string_ostream OSS(OutStr); 376 377 if (ShortNames) 378 OSS << Node->getNumber() << ':'; 379 else 380 Node->print(OSS); 381 } 382 383 if (OutStr[0] == '\n') OutStr.erase(OutStr.begin()); 384 385 // Process string output to make it nicer... 386 for (unsigned i = 0; i != OutStr.length(); ++i) 387 if (OutStr[i] == '\n') { // Left justify 388 OutStr[i] = '\\'; 389 OutStr.insert(OutStr.begin()+i+1, 'l'); 390 } 391 return OutStr; 392 } 393 }; 394} 395 396void MachineFunction::viewCFG() const 397{ 398#ifndef NDEBUG 399 ViewGraph(this, "mf" + getFunction()->getNameStr()); 400#else 401 errs() << "SelectionDAG::viewGraph is only available in debug builds on " 402 << "systems with Graphviz or gv!\n"; 403#endif // NDEBUG 404} 405 406void MachineFunction::viewCFGOnly() const 407{ 408#ifndef NDEBUG 409 ViewGraph(this, "mf" + getFunction()->getNameStr(), true); 410#else 411 errs() << "SelectionDAG::viewGraph is only available in debug builds on " 412 << "systems with Graphviz or gv!\n"; 413#endif // NDEBUG 414} 415 416/// addLiveIn - Add the specified physical register as a live-in value and 417/// create a corresponding virtual register for it. 418unsigned MachineFunction::addLiveIn(unsigned PReg, 419 const TargetRegisterClass *RC) { 420 assert(RC->contains(PReg) && "Not the correct regclass!"); 421 unsigned VReg = getRegInfo().createVirtualRegister(RC); 422 getRegInfo().addLiveIn(PReg, VReg); 423 return VReg; 424} 425 426/// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object. 427DebugLocTuple MachineFunction::getDebugLocTuple(DebugLoc DL) const { 428 unsigned Idx = DL.getIndex(); 429 assert(Idx < DebugLocInfo.DebugLocations.size() && 430 "Invalid index into debug locations!"); 431 return DebugLocInfo.DebugLocations[Idx]; 432} 433 434//===----------------------------------------------------------------------===// 435// MachineFrameInfo implementation 436//===----------------------------------------------------------------------===// 437 438/// CreateFixedObject - Create a new object at a fixed location on the stack. 439/// All fixed objects should be created before other objects are created for 440/// efficiency. By default, fixed objects are immutable. This returns an 441/// index with a negative value. 442/// 443int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset, 444 bool Immutable, bool isSS) { 445 assert(Size != 0 && "Cannot allocate zero size fixed stack objects!"); 446 Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset, Immutable, 447 isSS)); 448 return -++NumFixedObjects; 449} 450 451 452BitVector 453MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const { 454 assert(MBB && "MBB must be valid"); 455 const MachineFunction *MF = MBB->getParent(); 456 assert(MF && "MBB must be part of a MachineFunction"); 457 const TargetMachine &TM = MF->getTarget(); 458 const TargetRegisterInfo *TRI = TM.getRegisterInfo(); 459 BitVector BV(TRI->getNumRegs()); 460 461 // Before CSI is calculated, no registers are considered pristine. They can be 462 // freely used and PEI will make sure they are saved. 463 if (!isCalleeSavedInfoValid()) 464 return BV; 465 466 for (const unsigned *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR) 467 BV.set(*CSR); 468 469 // The entry MBB always has all CSRs pristine. 470 if (MBB == &MF->front()) 471 return BV; 472 473 // On other MBBs the saved CSRs are not pristine. 474 const std::vector<CalleeSavedInfo> &CSI = getCalleeSavedInfo(); 475 for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(), 476 E = CSI.end(); I != E; ++I) 477 BV.reset(I->getReg()); 478 479 return BV; 480} 481 482 483void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{ 484 if (Objects.empty()) return; 485 486 const TargetFrameInfo *FI = MF.getTarget().getFrameInfo(); 487 int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0); 488 489 OS << "Frame Objects:\n"; 490 491 for (unsigned i = 0, e = Objects.size(); i != e; ++i) { 492 const StackObject &SO = Objects[i]; 493 OS << " fi#" << (int)(i-NumFixedObjects) << ": "; 494 if (SO.Size == ~0ULL) { 495 OS << "dead\n"; 496 continue; 497 } 498 if (SO.Size == 0) 499 OS << "variable sized"; 500 else 501 OS << "size=" << SO.Size; 502 OS << ", align=" << SO.Alignment; 503 504 if (i < NumFixedObjects) 505 OS << ", fixed"; 506 if (i < NumFixedObjects || SO.SPOffset != -1) { 507 int64_t Off = SO.SPOffset - ValOffset; 508 OS << ", at location [SP"; 509 if (Off > 0) 510 OS << "+" << Off; 511 else if (Off < 0) 512 OS << Off; 513 OS << "]"; 514 } 515 OS << "\n"; 516 } 517} 518 519void MachineFrameInfo::dump(const MachineFunction &MF) const { 520 print(MF, errs()); 521} 522 523//===----------------------------------------------------------------------===// 524// MachineJumpTableInfo implementation 525//===----------------------------------------------------------------------===// 526 527/// getJumpTableIndex - Create a new jump table entry in the jump table info 528/// or return an existing one. 529/// 530unsigned MachineJumpTableInfo::getJumpTableIndex( 531 const std::vector<MachineBasicBlock*> &DestBBs) { 532 assert(!DestBBs.empty() && "Cannot create an empty jump table!"); 533 JumpTables.push_back(MachineJumpTableEntry(DestBBs)); 534 return JumpTables.size()-1; 535} 536 537/// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update 538/// the jump tables to branch to New instead. 539bool 540MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old, 541 MachineBasicBlock *New) { 542 assert(Old != New && "Not making a change?"); 543 bool MadeChange = false; 544 for (size_t i = 0, e = JumpTables.size(); i != e; ++i) 545 ReplaceMBBInJumpTable(i, Old, New); 546 return MadeChange; 547} 548 549/// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update 550/// the jump table to branch to New instead. 551bool 552MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx, 553 MachineBasicBlock *Old, 554 MachineBasicBlock *New) { 555 assert(Old != New && "Not making a change?"); 556 bool MadeChange = false; 557 MachineJumpTableEntry &JTE = JumpTables[Idx]; 558 for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j) 559 if (JTE.MBBs[j] == Old) { 560 JTE.MBBs[j] = New; 561 MadeChange = true; 562 } 563 return MadeChange; 564} 565 566void MachineJumpTableInfo::print(raw_ostream &OS) const { 567 if (JumpTables.empty()) return; 568 569 OS << "Jump Tables:\n"; 570 571 for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) { 572 OS << " jt#" << i << ": "; 573 for (unsigned j = 0, f = JumpTables[i].MBBs.size(); j != f; ++j) 574 OS << " BB#" << JumpTables[i].MBBs[j]->getNumber(); 575 } 576 577 OS << '\n'; 578} 579 580void MachineJumpTableInfo::dump() const { print(errs()); } 581 582 583//===----------------------------------------------------------------------===// 584// MachineConstantPool implementation 585//===----------------------------------------------------------------------===// 586 587const Type *MachineConstantPoolEntry::getType() const { 588 if (isMachineConstantPoolEntry()) 589 return Val.MachineCPVal->getType(); 590 return Val.ConstVal->getType(); 591} 592 593 594unsigned MachineConstantPoolEntry::getRelocationInfo() const { 595 if (isMachineConstantPoolEntry()) 596 return Val.MachineCPVal->getRelocationInfo(); 597 return Val.ConstVal->getRelocationInfo(); 598} 599 600MachineConstantPool::~MachineConstantPool() { 601 for (unsigned i = 0, e = Constants.size(); i != e; ++i) 602 if (Constants[i].isMachineConstantPoolEntry()) 603 delete Constants[i].Val.MachineCPVal; 604} 605 606/// CanShareConstantPoolEntry - Test whether the given two constants 607/// can be allocated the same constant pool entry. 608static bool CanShareConstantPoolEntry(Constant *A, Constant *B, 609 const TargetData *TD) { 610 // Handle the trivial case quickly. 611 if (A == B) return true; 612 613 // If they have the same type but weren't the same constant, quickly 614 // reject them. 615 if (A->getType() == B->getType()) return false; 616 617 // For now, only support constants with the same size. 618 if (TD->getTypeStoreSize(A->getType()) != TD->getTypeStoreSize(B->getType())) 619 return false; 620 621 // If a floating-point value and an integer value have the same encoding, 622 // they can share a constant-pool entry. 623 if (ConstantFP *AFP = dyn_cast<ConstantFP>(A)) 624 if (ConstantInt *BI = dyn_cast<ConstantInt>(B)) 625 return AFP->getValueAPF().bitcastToAPInt() == BI->getValue(); 626 if (ConstantFP *BFP = dyn_cast<ConstantFP>(B)) 627 if (ConstantInt *AI = dyn_cast<ConstantInt>(A)) 628 return BFP->getValueAPF().bitcastToAPInt() == AI->getValue(); 629 630 // Two vectors can share an entry if each pair of corresponding 631 // elements could. 632 if (ConstantVector *AV = dyn_cast<ConstantVector>(A)) 633 if (ConstantVector *BV = dyn_cast<ConstantVector>(B)) { 634 if (AV->getType()->getNumElements() != BV->getType()->getNumElements()) 635 return false; 636 for (unsigned i = 0, e = AV->getType()->getNumElements(); i != e; ++i) 637 if (!CanShareConstantPoolEntry(AV->getOperand(i), 638 BV->getOperand(i), TD)) 639 return false; 640 return true; 641 } 642 643 // TODO: Handle other cases. 644 645 return false; 646} 647 648/// getConstantPoolIndex - Create a new entry in the constant pool or return 649/// an existing one. User must specify the log2 of the minimum required 650/// alignment for the object. 651/// 652unsigned MachineConstantPool::getConstantPoolIndex(Constant *C, 653 unsigned Alignment) { 654 assert(Alignment && "Alignment must be specified!"); 655 if (Alignment > PoolAlignment) PoolAlignment = Alignment; 656 657 // Check to see if we already have this constant. 658 // 659 // FIXME, this could be made much more efficient for large constant pools. 660 for (unsigned i = 0, e = Constants.size(); i != e; ++i) 661 if (!Constants[i].isMachineConstantPoolEntry() && 662 CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C, TD)) { 663 if ((unsigned)Constants[i].getAlignment() < Alignment) 664 Constants[i].Alignment = Alignment; 665 return i; 666 } 667 668 Constants.push_back(MachineConstantPoolEntry(C, Alignment)); 669 return Constants.size()-1; 670} 671 672unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V, 673 unsigned Alignment) { 674 assert(Alignment && "Alignment must be specified!"); 675 if (Alignment > PoolAlignment) PoolAlignment = Alignment; 676 677 // Check to see if we already have this constant. 678 // 679 // FIXME, this could be made much more efficient for large constant pools. 680 int Idx = V->getExistingMachineCPValue(this, Alignment); 681 if (Idx != -1) 682 return (unsigned)Idx; 683 684 Constants.push_back(MachineConstantPoolEntry(V, Alignment)); 685 return Constants.size()-1; 686} 687 688void MachineConstantPool::print(raw_ostream &OS) const { 689 if (Constants.empty()) return; 690 691 OS << "Constant Pool:\n"; 692 for (unsigned i = 0, e = Constants.size(); i != e; ++i) { 693 OS << " cp#" << i << ": "; 694 if (Constants[i].isMachineConstantPoolEntry()) 695 Constants[i].Val.MachineCPVal->print(OS); 696 else 697 OS << *(Value*)Constants[i].Val.ConstVal; 698 OS << ", align=" << Constants[i].getAlignment(); 699 OS << "\n"; 700 } 701} 702 703void MachineConstantPool::dump() const { print(errs()); } 704