1 //===-- MachineFunction.cpp -----------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Collect native machine code information for a function. This allows
11 // target-specific information about the generated code to be stored with each
14 //===----------------------------------------------------------------------===//
16 #include "llvm/DerivedTypes.h"
17 #include "llvm/Function.h"
18 #include "llvm/Instructions.h"
19 #include "llvm/Config/config.h"
20 #include "llvm/CodeGen/MachineConstantPool.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineFunctionPass.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/MachineInstr.h"
25 #include "llvm/CodeGen/MachineJumpTableInfo.h"
26 #include "llvm/CodeGen/MachineRegisterInfo.h"
27 #include "llvm/CodeGen/Passes.h"
28 #include "llvm/MC/MCAsmInfo.h"
29 #include "llvm/MC/MCContext.h"
30 #include "llvm/Analysis/DebugInfo.h"
31 #include "llvm/Support/Debug.h"
32 #include "llvm/Target/TargetData.h"
33 #include "llvm/Target/TargetLowering.h"
34 #include "llvm/Target/TargetMachine.h"
35 #include "llvm/Target/TargetFrameInfo.h"
36 #include "llvm/ADT/SmallString.h"
37 #include "llvm/ADT/STLExtras.h"
38 #include "llvm/Support/GraphWriter.h"
39 #include "llvm/Support/raw_ostream.h"
43 struct Printer : public MachineFunctionPass {
47 const std::string Banner;
49 Printer(raw_ostream &os, const std::string &banner)
50 : MachineFunctionPass(&ID), OS(os), Banner(banner) {}
52 const char *getPassName() const { return "MachineFunction Printer"; }
54 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
56 MachineFunctionPass::getAnalysisUsage(AU);
59 bool runOnMachineFunction(MachineFunction &MF) {
60 OS << "# " << Banner << ":\n";
68 /// Returns a newly-created MachineFunction Printer pass. The default banner is
71 FunctionPass *llvm::createMachineFunctionPrinterPass(raw_ostream &OS,
72 const std::string &Banner){
73 return new Printer(OS, Banner);
76 //===----------------------------------------------------------------------===//
77 // MachineFunction implementation
78 //===----------------------------------------------------------------------===//
80 // Out of line virtual method.
81 MachineFunctionInfo::~MachineFunctionInfo() {}
83 void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
84 MBB->getParent()->DeleteMachineBasicBlock(MBB);
87 MachineFunction::MachineFunction(Function *F, const TargetMachine &TM,
90 if (TM.getRegisterInfo())
91 RegInfo = new (Allocator.Allocate<MachineRegisterInfo>())
92 MachineRegisterInfo(*TM.getRegisterInfo());
96 FrameInfo = new (Allocator.Allocate<MachineFrameInfo>())
97 MachineFrameInfo(*TM.getFrameInfo());
98 ConstantPool = new (Allocator.Allocate<MachineConstantPool>())
99 MachineConstantPool(TM.getTargetData());
100 Alignment = TM.getTargetLowering()->getFunctionAlignment(F);
101 FunctionNumber = FunctionNum;
105 MachineFunction::~MachineFunction() {
107 InstructionRecycler.clear(Allocator);
108 BasicBlockRecycler.clear(Allocator);
110 RegInfo->~MachineRegisterInfo();
111 Allocator.Deallocate(RegInfo);
114 MFInfo->~MachineFunctionInfo();
115 Allocator.Deallocate(MFInfo);
117 FrameInfo->~MachineFrameInfo(); Allocator.Deallocate(FrameInfo);
118 ConstantPool->~MachineConstantPool(); Allocator.Deallocate(ConstantPool);
121 JumpTableInfo->~MachineJumpTableInfo();
122 Allocator.Deallocate(JumpTableInfo);
126 /// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it
127 /// does already exist, allocate one.
128 MachineJumpTableInfo *MachineFunction::
129 getOrCreateJumpTableInfo(unsigned EntryKind) {
130 if (JumpTableInfo) return JumpTableInfo;
132 JumpTableInfo = new (Allocator.Allocate<MachineJumpTableInfo>())
133 MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind);
134 return JumpTableInfo;
137 /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and
138 /// recomputes them. This guarantees that the MBB numbers are sequential,
139 /// dense, and match the ordering of the blocks within the function. If a
140 /// specific MachineBasicBlock is specified, only that block and those after
141 /// it are renumbered.
142 void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) {
143 if (empty()) { MBBNumbering.clear(); return; }
144 MachineFunction::iterator MBBI, E = end();
150 // Figure out the block number this should have.
151 unsigned BlockNo = 0;
153 BlockNo = prior(MBBI)->getNumber()+1;
155 for (; MBBI != E; ++MBBI, ++BlockNo) {
156 if (MBBI->getNumber() != (int)BlockNo) {
157 // Remove use of the old number.
158 if (MBBI->getNumber() != -1) {
159 assert(MBBNumbering[MBBI->getNumber()] == &*MBBI &&
160 "MBB number mismatch!");
161 MBBNumbering[MBBI->getNumber()] = 0;
164 // If BlockNo is already taken, set that block's number to -1.
165 if (MBBNumbering[BlockNo])
166 MBBNumbering[BlockNo]->setNumber(-1);
168 MBBNumbering[BlockNo] = MBBI;
169 MBBI->setNumber(BlockNo);
173 // Okay, all the blocks are renumbered. If we have compactified the block
174 // numbering, shrink MBBNumbering now.
175 assert(BlockNo <= MBBNumbering.size() && "Mismatch!");
176 MBBNumbering.resize(BlockNo);
179 /// CreateMachineInstr - Allocate a new MachineInstr. Use this instead
180 /// of `new MachineInstr'.
183 MachineFunction::CreateMachineInstr(const TargetInstrDesc &TID,
184 DebugLoc DL, bool NoImp) {
185 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
186 MachineInstr(TID, DL, NoImp);
189 /// CloneMachineInstr - Create a new MachineInstr which is a copy of the
190 /// 'Orig' instruction, identical in all ways except the the instruction
191 /// has no parent, prev, or next.
194 MachineFunction::CloneMachineInstr(const MachineInstr *Orig) {
195 return new (InstructionRecycler.Allocate<MachineInstr>(Allocator))
196 MachineInstr(*this, *Orig);
199 /// DeleteMachineInstr - Delete the given MachineInstr.
202 MachineFunction::DeleteMachineInstr(MachineInstr *MI) {
204 InstructionRecycler.Deallocate(Allocator, MI);
207 /// CreateMachineBasicBlock - Allocate a new MachineBasicBlock. Use this
208 /// instead of `new MachineBasicBlock'.
211 MachineFunction::CreateMachineBasicBlock(const BasicBlock *bb) {
212 return new (BasicBlockRecycler.Allocate<MachineBasicBlock>(Allocator))
213 MachineBasicBlock(*this, bb);
216 /// DeleteMachineBasicBlock - Delete the given MachineBasicBlock.
219 MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) {
220 assert(MBB->getParent() == this && "MBB parent mismatch!");
221 MBB->~MachineBasicBlock();
222 BasicBlockRecycler.Deallocate(Allocator, MBB);
226 MachineFunction::getMachineMemOperand(const Value *v, unsigned f,
227 int64_t o, uint64_t s,
228 unsigned base_alignment) {
229 return new (Allocator.Allocate<MachineMemOperand>())
230 MachineMemOperand(v, f, o, s, base_alignment);
234 MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO,
235 int64_t Offset, uint64_t Size) {
236 return new (Allocator.Allocate<MachineMemOperand>())
237 MachineMemOperand(MMO->getValue(), MMO->getFlags(),
238 int64_t(uint64_t(MMO->getOffset()) +
240 Size, MMO->getBaseAlignment());
243 MachineInstr::mmo_iterator
244 MachineFunction::allocateMemRefsArray(unsigned long Num) {
245 return Allocator.Allocate<MachineMemOperand *>(Num);
248 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
249 MachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin,
250 MachineInstr::mmo_iterator End) {
251 // Count the number of load mem refs.
253 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
257 // Allocate a new array and populate it with the load information.
258 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
260 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
261 if ((*I)->isLoad()) {
262 if (!(*I)->isStore())
266 // Clone the MMO and unset the store flag.
267 MachineMemOperand *JustLoad =
268 getMachineMemOperand((*I)->getValue(),
269 (*I)->getFlags() & ~MachineMemOperand::MOStore,
270 (*I)->getOffset(), (*I)->getSize(),
271 (*I)->getBaseAlignment());
272 Result[Index] = JustLoad;
277 return std::make_pair(Result, Result + Num);
280 std::pair<MachineInstr::mmo_iterator, MachineInstr::mmo_iterator>
281 MachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin,
282 MachineInstr::mmo_iterator End) {
283 // Count the number of load mem refs.
285 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I)
289 // Allocate a new array and populate it with the store information.
290 MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num);
292 for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) {
293 if ((*I)->isStore()) {
298 // Clone the MMO and unset the load flag.
299 MachineMemOperand *JustStore =
300 getMachineMemOperand((*I)->getValue(),
301 (*I)->getFlags() & ~MachineMemOperand::MOLoad,
302 (*I)->getOffset(), (*I)->getSize(),
303 (*I)->getBaseAlignment());
304 Result[Index] = JustStore;
309 return std::make_pair(Result, Result + Num);
312 void MachineFunction::dump() const {
316 void MachineFunction::print(raw_ostream &OS) const {
317 OS << "# Machine code for function " << Fn->getName() << ":\n";
319 // Print Frame Information
320 FrameInfo->print(*this, OS);
322 // Print JumpTable Information
324 JumpTableInfo->print(OS);
326 // Print Constant Pool
327 ConstantPool->print(OS);
329 const TargetRegisterInfo *TRI = getTarget().getRegisterInfo();
331 if (RegInfo && !RegInfo->livein_empty()) {
332 OS << "Function Live Ins: ";
333 for (MachineRegisterInfo::livein_iterator
334 I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) {
336 OS << "%" << TRI->getName(I->first);
338 OS << " %physreg" << I->first;
341 OS << " in reg%" << I->second;
343 if (llvm::next(I) != E)
348 if (RegInfo && !RegInfo->liveout_empty()) {
349 OS << "Function Live Outs: ";
350 for (MachineRegisterInfo::liveout_iterator
351 I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I){
353 OS << '%' << TRI->getName(*I);
355 OS << "%physreg" << *I;
357 if (llvm::next(I) != E)
363 for (const_iterator BB = begin(), E = end(); BB != E; ++BB) {
368 OS << "\n# End machine code for function " << Fn->getName() << ".\n\n";
373 struct DOTGraphTraits<const MachineFunction*> : public DefaultDOTGraphTraits {
375 DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {}
377 static std::string getGraphName(const MachineFunction *F) {
378 return "CFG for '" + F->getFunction()->getNameStr() + "' function";
381 std::string getNodeLabel(const MachineBasicBlock *Node,
382 const MachineFunction *Graph) {
383 if (isSimple () && Node->getBasicBlock() &&
384 !Node->getBasicBlock()->getName().empty())
385 return Node->getBasicBlock()->getNameStr() + ":";
389 raw_string_ostream OSS(OutStr);
392 OSS << Node->getNumber() << ':';
397 if (OutStr[0] == '\n') OutStr.erase(OutStr.begin());
399 // Process string output to make it nicer...
400 for (unsigned i = 0; i != OutStr.length(); ++i)
401 if (OutStr[i] == '\n') { // Left justify
403 OutStr.insert(OutStr.begin()+i+1, 'l');
410 void MachineFunction::viewCFG() const
413 ViewGraph(this, "mf" + getFunction()->getNameStr());
415 errs() << "SelectionDAG::viewGraph is only available in debug builds on "
416 << "systems with Graphviz or gv!\n";
420 void MachineFunction::viewCFGOnly() const
423 ViewGraph(this, "mf" + getFunction()->getNameStr(), true);
425 errs() << "SelectionDAG::viewGraph is only available in debug builds on "
426 << "systems with Graphviz or gv!\n";
430 /// addLiveIn - Add the specified physical register as a live-in value and
431 /// create a corresponding virtual register for it.
432 unsigned MachineFunction::addLiveIn(unsigned PReg,
433 const TargetRegisterClass *RC) {
434 assert(RC->contains(PReg) && "Not the correct regclass!");
435 unsigned VReg = getRegInfo().createVirtualRegister(RC);
436 getRegInfo().addLiveIn(PReg, VReg);
440 /// getDILocation - Get the DILocation for a given DebugLoc object.
441 DILocation MachineFunction::getDILocation(DebugLoc DL) const {
442 unsigned Idx = DL.getIndex();
443 assert(Idx < DebugLocInfo.DebugLocations.size() &&
444 "Invalid index into debug locations!");
445 return DILocation(DebugLocInfo.DebugLocations[Idx]);
449 /// getJTISymbol - Return the MCSymbol for the specified non-empty jump table.
450 /// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a
451 /// normal 'L' label is returned.
452 MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx,
453 bool isLinkerPrivate) const {
454 assert(JumpTableInfo && "No jump tables");
456 const std::vector<MachineJumpTableEntry> &JTs =JumpTableInfo->getJumpTables();
457 assert(JTI < JTs.size() && "Invalid JTI!");
458 const MCAsmInfo &MAI = *getTarget().getMCAsmInfo();
460 const char *Prefix = isLinkerPrivate ? MAI.getLinkerPrivateGlobalPrefix() :
461 MAI.getPrivateGlobalPrefix();
462 SmallString<60> Name;
463 raw_svector_ostream(Name)
464 << Prefix << "JTI" << getFunctionNumber() << '_' << JTI;
465 return Ctx.GetOrCreateSymbol(Name.str());
469 //===----------------------------------------------------------------------===//
470 // MachineFrameInfo implementation
471 //===----------------------------------------------------------------------===//
473 /// CreateFixedObject - Create a new object at a fixed location on the stack.
474 /// All fixed objects should be created before other objects are created for
475 /// efficiency. By default, fixed objects are immutable. This returns an
476 /// index with a negative value.
478 int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset,
479 bool Immutable, bool isSS) {
480 assert(Size != 0 && "Cannot allocate zero size fixed stack objects!");
481 Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset, Immutable,
483 return -++NumFixedObjects;
488 MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const {
489 assert(MBB && "MBB must be valid");
490 const MachineFunction *MF = MBB->getParent();
491 assert(MF && "MBB must be part of a MachineFunction");
492 const TargetMachine &TM = MF->getTarget();
493 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
494 BitVector BV(TRI->getNumRegs());
496 // Before CSI is calculated, no registers are considered pristine. They can be
497 // freely used and PEI will make sure they are saved.
498 if (!isCalleeSavedInfoValid())
501 for (const unsigned *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR)
504 // The entry MBB always has all CSRs pristine.
505 if (MBB == &MF->front())
508 // On other MBBs the saved CSRs are not pristine.
509 const std::vector<CalleeSavedInfo> &CSI = getCalleeSavedInfo();
510 for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
511 E = CSI.end(); I != E; ++I)
512 BV.reset(I->getReg());
518 void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{
519 if (Objects.empty()) return;
521 const TargetFrameInfo *FI = MF.getTarget().getFrameInfo();
522 int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0);
524 OS << "Frame Objects:\n";
526 for (unsigned i = 0, e = Objects.size(); i != e; ++i) {
527 const StackObject &SO = Objects[i];
528 OS << " fi#" << (int)(i-NumFixedObjects) << ": ";
529 if (SO.Size == ~0ULL) {
534 OS << "variable sized";
536 OS << "size=" << SO.Size;
537 OS << ", align=" << SO.Alignment;
539 if (i < NumFixedObjects)
541 if (i < NumFixedObjects || SO.SPOffset != -1) {
542 int64_t Off = SO.SPOffset - ValOffset;
543 OS << ", at location [SP";
554 void MachineFrameInfo::dump(const MachineFunction &MF) const {
558 //===----------------------------------------------------------------------===//
559 // MachineJumpTableInfo implementation
560 //===----------------------------------------------------------------------===//
562 /// getEntrySize - Return the size of each entry in the jump table.
563 unsigned MachineJumpTableInfo::getEntrySize(const TargetData &TD) const {
564 // The size of a jump table entry is 4 bytes unless the entry is just the
565 // address of a block, in which case it is the pointer size.
566 switch (getEntryKind()) {
567 case MachineJumpTableInfo::EK_BlockAddress:
568 return TD.getPointerSize();
569 case MachineJumpTableInfo::EK_GPRel32BlockAddress:
570 case MachineJumpTableInfo::EK_LabelDifference32:
571 case MachineJumpTableInfo::EK_Custom32:
574 assert(0 && "Unknown jump table encoding!");
578 /// getEntryAlignment - Return the alignment of each entry in the jump table.
579 unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const {
580 // The alignment of a jump table entry is the alignment of int32 unless the
581 // entry is just the address of a block, in which case it is the pointer
583 switch (getEntryKind()) {
584 case MachineJumpTableInfo::EK_BlockAddress:
585 return TD.getPointerABIAlignment();
586 case MachineJumpTableInfo::EK_GPRel32BlockAddress:
587 case MachineJumpTableInfo::EK_LabelDifference32:
588 case MachineJumpTableInfo::EK_Custom32:
589 return TD.getABIIntegerTypeAlignment(32);
591 assert(0 && "Unknown jump table encoding!");
595 /// getJumpTableIndex - Create a new jump table entry in the jump table info
596 /// or return an existing one.
598 unsigned MachineJumpTableInfo::getJumpTableIndex(
599 const std::vector<MachineBasicBlock*> &DestBBs) {
600 assert(!DestBBs.empty() && "Cannot create an empty jump table!");
601 JumpTables.push_back(MachineJumpTableEntry(DestBBs));
602 return JumpTables.size()-1;
606 /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update
607 /// the jump tables to branch to New instead.
608 bool MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old,
609 MachineBasicBlock *New) {
610 assert(Old != New && "Not making a change?");
611 bool MadeChange = false;
612 for (size_t i = 0, e = JumpTables.size(); i != e; ++i)
613 ReplaceMBBInJumpTable(i, Old, New);
617 /// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update
618 /// the jump table to branch to New instead.
619 bool MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx,
620 MachineBasicBlock *Old,
621 MachineBasicBlock *New) {
622 assert(Old != New && "Not making a change?");
623 bool MadeChange = false;
624 MachineJumpTableEntry &JTE = JumpTables[Idx];
625 for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j)
626 if (JTE.MBBs[j] == Old) {
633 void MachineJumpTableInfo::print(raw_ostream &OS) const {
634 if (JumpTables.empty()) return;
636 OS << "Jump Tables:\n";
638 for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) {
639 OS << " jt#" << i << ": ";
640 for (unsigned j = 0, f = JumpTables[i].MBBs.size(); j != f; ++j)
641 OS << " BB#" << JumpTables[i].MBBs[j]->getNumber();
647 void MachineJumpTableInfo::dump() const { print(dbgs()); }
650 //===----------------------------------------------------------------------===//
651 // MachineConstantPool implementation
652 //===----------------------------------------------------------------------===//
654 const Type *MachineConstantPoolEntry::getType() const {
655 if (isMachineConstantPoolEntry())
656 return Val.MachineCPVal->getType();
657 return Val.ConstVal->getType();
661 unsigned MachineConstantPoolEntry::getRelocationInfo() const {
662 if (isMachineConstantPoolEntry())
663 return Val.MachineCPVal->getRelocationInfo();
664 return Val.ConstVal->getRelocationInfo();
667 MachineConstantPool::~MachineConstantPool() {
668 for (unsigned i = 0, e = Constants.size(); i != e; ++i)
669 if (Constants[i].isMachineConstantPoolEntry())
670 delete Constants[i].Val.MachineCPVal;
673 /// CanShareConstantPoolEntry - Test whether the given two constants
674 /// can be allocated the same constant pool entry.
675 static bool CanShareConstantPoolEntry(Constant *A, Constant *B,
676 const TargetData *TD) {
677 // Handle the trivial case quickly.
678 if (A == B) return true;
680 // If they have the same type but weren't the same constant, quickly
682 if (A->getType() == B->getType()) return false;
684 // For now, only support constants with the same size.
685 if (TD->getTypeStoreSize(A->getType()) != TD->getTypeStoreSize(B->getType()))
688 // If a floating-point value and an integer value have the same encoding,
689 // they can share a constant-pool entry.
690 if (ConstantFP *AFP = dyn_cast<ConstantFP>(A))
691 if (ConstantInt *BI = dyn_cast<ConstantInt>(B))
692 return AFP->getValueAPF().bitcastToAPInt() == BI->getValue();
693 if (ConstantFP *BFP = dyn_cast<ConstantFP>(B))
694 if (ConstantInt *AI = dyn_cast<ConstantInt>(A))
695 return BFP->getValueAPF().bitcastToAPInt() == AI->getValue();
697 // Two vectors can share an entry if each pair of corresponding
699 if (ConstantVector *AV = dyn_cast<ConstantVector>(A))
700 if (ConstantVector *BV = dyn_cast<ConstantVector>(B)) {
701 if (AV->getType()->getNumElements() != BV->getType()->getNumElements())
703 for (unsigned i = 0, e = AV->getType()->getNumElements(); i != e; ++i)
704 if (!CanShareConstantPoolEntry(AV->getOperand(i),
705 BV->getOperand(i), TD))
710 // TODO: Handle other cases.
715 /// getConstantPoolIndex - Create a new entry in the constant pool or return
716 /// an existing one. User must specify the log2 of the minimum required
717 /// alignment for the object.
719 unsigned MachineConstantPool::getConstantPoolIndex(Constant *C,
720 unsigned Alignment) {
721 assert(Alignment && "Alignment must be specified!");
722 if (Alignment > PoolAlignment) PoolAlignment = Alignment;
724 // Check to see if we already have this constant.
726 // FIXME, this could be made much more efficient for large constant pools.
727 for (unsigned i = 0, e = Constants.size(); i != e; ++i)
728 if (!Constants[i].isMachineConstantPoolEntry() &&
729 CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C, TD)) {
730 if ((unsigned)Constants[i].getAlignment() < Alignment)
731 Constants[i].Alignment = Alignment;
735 Constants.push_back(MachineConstantPoolEntry(C, Alignment));
736 return Constants.size()-1;
739 unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V,
740 unsigned Alignment) {
741 assert(Alignment && "Alignment must be specified!");
742 if (Alignment > PoolAlignment) PoolAlignment = Alignment;
744 // Check to see if we already have this constant.
746 // FIXME, this could be made much more efficient for large constant pools.
747 int Idx = V->getExistingMachineCPValue(this, Alignment);
749 return (unsigned)Idx;
751 Constants.push_back(MachineConstantPoolEntry(V, Alignment));
752 return Constants.size()-1;
755 void MachineConstantPool::print(raw_ostream &OS) const {
756 if (Constants.empty()) return;
758 OS << "Constant Pool:\n";
759 for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
760 OS << " cp#" << i << ": ";
761 if (Constants[i].isMachineConstantPoolEntry())
762 Constants[i].Val.MachineCPVal->print(OS);
764 OS << *(Value*)Constants[i].Val.ConstVal;
765 OS << ", align=" << Constants[i].getAlignment();
770 void MachineConstantPool::dump() const { print(dbgs()); }