X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FMachineFunction.cpp;h=64e0083017b048fdd3e90d82f27304a3106f0471;hb=948a44458c2965e6c2924bbd47c4d41bda0d78f0;hp=5bf86e3630fabcbddd0294e503d43946afc99b43;hpb=cf143a4d917699f8f4202f331fa9e184070471fb;p=oota-llvm.git diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp index 5bf86e3630f..64e0083017b 100644 --- a/lib/CodeGen/MachineFunction.cpp +++ b/lib/CodeGen/MachineFunction.cpp @@ -13,94 +13,63 @@ // //===----------------------------------------------------------------------===// -#include "llvm/DerivedTypes.h" +#include "llvm/CodeGen/MachineFunction.h" #include "llvm/Function.h" -#include "llvm/Instructions.h" -#include "llvm/ADT/STLExtras.h" -#include "llvm/Config/config.h" #include "llvm/CodeGen/MachineConstantPool.h" -#include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineInstr.h" #include "llvm/CodeGen/MachineJumpTableInfo.h" +#include "llvm/CodeGen/MachineModuleInfo.h" #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/CodeGen/Passes.h" +#include "llvm/MC/MCAsmInfo.h" +#include "llvm/MC/MCContext.h" +#include "llvm/Analysis/ConstantFolding.h" +#include "llvm/Analysis/DebugInfo.h" +#include "llvm/Support/Debug.h" #include "llvm/Target/TargetData.h" #include "llvm/Target/TargetLowering.h" #include "llvm/Target/TargetMachine.h" -#include "llvm/Target/TargetFrameInfo.h" -#include "llvm/Support/Compiler.h" +#include "llvm/Target/TargetFrameLowering.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/STLExtras.h" #include "llvm/Support/GraphWriter.h" #include "llvm/Support/raw_ostream.h" using namespace llvm; -namespace { - struct VISIBILITY_HIDDEN Printer : public MachineFunctionPass { - static char ID; - - raw_ostream &OS; - const std::string Banner; - - Printer(raw_ostream &os, const std::string &banner) - : MachineFunctionPass(&ID), OS(os), Banner(banner) {} - - const char *getPassName() const { return "MachineFunction Printer"; } - - virtual void getAnalysisUsage(AnalysisUsage &AU) const { - AU.setPreservesAll(); - MachineFunctionPass::getAnalysisUsage(AU); - } - - bool runOnMachineFunction(MachineFunction &MF) { - OS << Banner; - MF.print(OS); - return false; - } - }; - char Printer::ID = 0; -} - -/// Returns a newly-created MachineFunction Printer pass. The default banner is -/// empty. -/// -FunctionPass *llvm::createMachineFunctionPrinterPass(raw_ostream &OS, - const std::string &Banner){ - return new Printer(OS, Banner); -} - -//===---------------------------------------------------------------------===// +//===----------------------------------------------------------------------===// // MachineFunction implementation -//===---------------------------------------------------------------------===// +//===----------------------------------------------------------------------===// + +// Out of line virtual method. +MachineFunctionInfo::~MachineFunctionInfo() {} void ilist_traits::deleteNode(MachineBasicBlock *MBB) { MBB->getParent()->DeleteMachineBasicBlock(MBB); } -MachineFunction::MachineFunction(Function *F, - const TargetMachine &TM) - : Fn(F), Target(TM) { +MachineFunction::MachineFunction(const Function *F, const TargetMachine &TM, + unsigned FunctionNum, MachineModuleInfo &mmi, + GCModuleInfo* gmi) + : Fn(F), Target(TM), Ctx(mmi.getContext()), MMI(mmi), GMI(gmi) { if (TM.getRegisterInfo()) - RegInfo = new (Allocator.Allocate()) - MachineRegisterInfo(*TM.getRegisterInfo()); + RegInfo = new (Allocator) MachineRegisterInfo(*TM.getRegisterInfo()); else RegInfo = 0; MFInfo = 0; - FrameInfo = new (Allocator.Allocate()) - MachineFrameInfo(*TM.getFrameInfo()); - ConstantPool = new (Allocator.Allocate()) - MachineConstantPool(TM.getTargetData()); - Alignment = TM.getTargetLowering()->getFunctionAlignment(F); - - // Set up jump table. - const TargetData &TD = *TM.getTargetData(); - bool IsPic = TM.getRelocationModel() == Reloc::PIC_; - unsigned EntrySize = IsPic ? 4 : TD.getPointerSize(); - unsigned TyAlignment = IsPic ? - TD.getABITypeAlignment(Type::getInt32Ty(F->getContext())) - : TD.getPointerABIAlignment(); - JumpTableInfo = new (Allocator.Allocate()) - MachineJumpTableInfo(EntrySize, TyAlignment); + FrameInfo = new (Allocator) MachineFrameInfo(*TM.getFrameLowering()); + if (Fn->hasFnAttr(Attribute::StackAlignment)) + FrameInfo->setMaxAlignment(Attribute::getStackAlignmentFromAttrs( + Fn->getAttributes().getFnAttributes())); + ConstantPool = new (Allocator) MachineConstantPool(TM.getTargetData()); + Alignment = TM.getTargetLowering()->getMinFunctionAlignment(); + // FIXME: Shouldn't use pref alignment if explicit alignment is set on Fn. + if (!Fn->hasFnAttr(Attribute::OptimizeForSize)) + Alignment = std::max(Alignment, + TM.getTargetLowering()->getPrefFunctionAlignment()); + FunctionNumber = FunctionNum; + JumpTableInfo = 0; } MachineFunction::~MachineFunction() { @@ -117,9 +86,23 @@ MachineFunction::~MachineFunction() { } FrameInfo->~MachineFrameInfo(); Allocator.Deallocate(FrameInfo); ConstantPool->~MachineConstantPool(); Allocator.Deallocate(ConstantPool); - JumpTableInfo->~MachineJumpTableInfo(); Allocator.Deallocate(JumpTableInfo); + + if (JumpTableInfo) { + JumpTableInfo->~MachineJumpTableInfo(); + Allocator.Deallocate(JumpTableInfo); + } } +/// getOrCreateJumpTableInfo - Get the JumpTableInfo for this function, if it +/// does already exist, allocate one. +MachineJumpTableInfo *MachineFunction:: +getOrCreateJumpTableInfo(unsigned EntryKind) { + if (JumpTableInfo) return JumpTableInfo; + + JumpTableInfo = new (Allocator) + MachineJumpTableInfo((MachineJumpTableInfo::JTEntryKind)EntryKind); + return JumpTableInfo; +} /// RenumberBlocks - This discards all of the MachineBasicBlock numbers and /// recomputes them. This guarantees that the MBB numbers are sequential, @@ -167,14 +150,14 @@ void MachineFunction::RenumberBlocks(MachineBasicBlock *MBB) { /// of `new MachineInstr'. /// MachineInstr * -MachineFunction::CreateMachineInstr(const TargetInstrDesc &TID, +MachineFunction::CreateMachineInstr(const MCInstrDesc &MCID, DebugLoc DL, bool NoImp) { return new (InstructionRecycler.Allocate(Allocator)) - MachineInstr(TID, DL, NoImp); + MachineInstr(MCID, DL, NoImp); } /// CloneMachineInstr - Create a new MachineInstr which is a copy of the -/// 'Orig' instruction, identical in all ways except the the instruction +/// 'Orig' instruction, identical in all ways except the instruction /// has no parent, prev, or next. /// MachineInstr * @@ -187,11 +170,6 @@ MachineFunction::CloneMachineInstr(const MachineInstr *Orig) { /// void MachineFunction::DeleteMachineInstr(MachineInstr *MI) { - // Clear the instructions memoperands. This must be done manually because - // the instruction's parent pointer is now null, so it can't properly - // deallocate them on its own. - MI->clearMemOperands(*this); - MI->~MachineInstr(); InstructionRecycler.Deallocate(Allocator, MI); } @@ -214,18 +192,112 @@ MachineFunction::DeleteMachineBasicBlock(MachineBasicBlock *MBB) { BasicBlockRecycler.Deallocate(Allocator, MBB); } +MachineMemOperand * +MachineFunction::getMachineMemOperand(MachinePointerInfo PtrInfo, unsigned f, + uint64_t s, unsigned base_alignment, + const MDNode *TBAAInfo) { + return new (Allocator) MachineMemOperand(PtrInfo, f, s, base_alignment, + TBAAInfo); +} + +MachineMemOperand * +MachineFunction::getMachineMemOperand(const MachineMemOperand *MMO, + int64_t Offset, uint64_t Size) { + return new (Allocator) + MachineMemOperand(MachinePointerInfo(MMO->getValue(), + MMO->getOffset()+Offset), + MMO->getFlags(), Size, + MMO->getBaseAlignment(), 0); +} + +MachineInstr::mmo_iterator +MachineFunction::allocateMemRefsArray(unsigned long Num) { + return Allocator.Allocate(Num); +} + +std::pair +MachineFunction::extractLoadMemRefs(MachineInstr::mmo_iterator Begin, + MachineInstr::mmo_iterator End) { + // Count the number of load mem refs. + unsigned Num = 0; + for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) + if ((*I)->isLoad()) + ++Num; + + // Allocate a new array and populate it with the load information. + MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num); + unsigned Index = 0; + for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) { + if ((*I)->isLoad()) { + if (!(*I)->isStore()) + // Reuse the MMO. + Result[Index] = *I; + else { + // Clone the MMO and unset the store flag. + MachineMemOperand *JustLoad = + getMachineMemOperand((*I)->getPointerInfo(), + (*I)->getFlags() & ~MachineMemOperand::MOStore, + (*I)->getSize(), (*I)->getBaseAlignment(), + (*I)->getTBAAInfo()); + Result[Index] = JustLoad; + } + ++Index; + } + } + return std::make_pair(Result, Result + Num); +} + +std::pair +MachineFunction::extractStoreMemRefs(MachineInstr::mmo_iterator Begin, + MachineInstr::mmo_iterator End) { + // Count the number of load mem refs. + unsigned Num = 0; + for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) + if ((*I)->isStore()) + ++Num; + + // Allocate a new array and populate it with the store information. + MachineInstr::mmo_iterator Result = allocateMemRefsArray(Num); + unsigned Index = 0; + for (MachineInstr::mmo_iterator I = Begin; I != End; ++I) { + if ((*I)->isStore()) { + if (!(*I)->isLoad()) + // Reuse the MMO. + Result[Index] = *I; + else { + // Clone the MMO and unset the load flag. + MachineMemOperand *JustStore = + getMachineMemOperand((*I)->getPointerInfo(), + (*I)->getFlags() & ~MachineMemOperand::MOLoad, + (*I)->getSize(), (*I)->getBaseAlignment(), + (*I)->getTBAAInfo()); + Result[Index] = JustStore; + } + ++Index; + } + } + return std::make_pair(Result, Result + Num); +} + void MachineFunction::dump() const { - print(errs()); + print(dbgs()); } -void MachineFunction::print(raw_ostream &OS) const { - OS << "# Machine code for " << Fn->getName() << "():\n"; +void MachineFunction::print(raw_ostream &OS, SlotIndexes *Indexes) const { + OS << "# Machine code for function " << Fn->getName() << ": "; + if (RegInfo) { + OS << (RegInfo->isSSA() ? "SSA" : "Post SSA"); + if (!RegInfo->tracksLiveness()) + OS << ", not tracking liveness"; + } + OS << '\n'; // Print Frame Information FrameInfo->print(*this, OS); // Print JumpTable Information - JumpTableInfo->print(OS); + if (JumpTableInfo) + JumpTableInfo->print(OS); // Print Constant Pool ConstantPool->print(OS); @@ -233,57 +305,54 @@ void MachineFunction::print(raw_ostream &OS) const { const TargetRegisterInfo *TRI = getTarget().getRegisterInfo(); if (RegInfo && !RegInfo->livein_empty()) { - OS << "Live Ins:"; + OS << "Function Live Ins: "; for (MachineRegisterInfo::livein_iterator I = RegInfo->livein_begin(), E = RegInfo->livein_end(); I != E; ++I) { - if (TRI) - OS << " " << TRI->getName(I->first); - else - OS << " Reg #" << I->first; - + OS << PrintReg(I->first, TRI); if (I->second) - OS << " in VR#" << I->second << ' '; + OS << " in " << PrintReg(I->second, TRI); + if (llvm::next(I) != E) + OS << ", "; } OS << '\n'; } if (RegInfo && !RegInfo->liveout_empty()) { - OS << "Live Outs:"; + OS << "Function Live Outs:"; for (MachineRegisterInfo::liveout_iterator I = RegInfo->liveout_begin(), E = RegInfo->liveout_end(); I != E; ++I) - if (TRI) - OS << ' ' << TRI->getName(*I); - else - OS << " Reg #" << *I; + OS << ' ' << PrintReg(*I, TRI); OS << '\n'; } - for (const_iterator BB = begin(), E = end(); BB != E; ++BB) - BB->print(OS); + for (const_iterator BB = begin(), E = end(); BB != E; ++BB) { + OS << '\n'; + BB->print(OS, Indexes); + } - OS << "\n# End machine code for " << Fn->getName() << "().\n\n"; + OS << "\n# End machine code for function " << Fn->getName() << ".\n\n"; } namespace llvm { template<> struct DOTGraphTraits : public DefaultDOTGraphTraits { + + DOTGraphTraits (bool isSimple=false) : DefaultDOTGraphTraits(isSimple) {} + static std::string getGraphName(const MachineFunction *F) { - return "CFG for '" + F->getFunction()->getNameStr() + "' function"; + return "CFG for '" + F->getFunction()->getName().str() + "' function"; } - static std::string getNodeLabel(const MachineBasicBlock *Node, - const MachineFunction *Graph, - bool ShortNames) { - if (ShortNames && Node->getBasicBlock() && - !Node->getBasicBlock()->getName().empty()) - return Node->getBasicBlock()->getNameStr() + ":"; - + std::string getNodeLabel(const MachineBasicBlock *Node, + const MachineFunction *Graph) { std::string OutStr; { raw_string_ostream OSS(OutStr); - - if (ShortNames) - OSS << Node->getNumber() << ':'; - else + + if (isSimple()) { + OSS << "BB#" << Node->getNumber(); + if (const BasicBlock *BB = Node->getBasicBlock()) + OSS << ": " << BB->getName(); + } else Node->print(OSS); } @@ -303,20 +372,20 @@ namespace llvm { void MachineFunction::viewCFG() const { #ifndef NDEBUG - ViewGraph(this, "mf" + getFunction()->getNameStr()); + ViewGraph(this, "mf" + getFunction()->getName()); #else - cerr << "SelectionDAG::viewGraph is only available in debug builds on " - << "systems with Graphviz or gv!\n"; + errs() << "MachineFunction::viewCFG is only available in debug builds on " + << "systems with Graphviz or gv!\n"; #endif // NDEBUG } void MachineFunction::viewCFGOnly() const { #ifndef NDEBUG - ViewGraph(this, "mf" + getFunction()->getNameStr(), true); + ViewGraph(this, "mf" + getFunction()->getName(), true); #else - cerr << "SelectionDAG::viewGraph is only available in debug builds on " - << "systems with Graphviz or gv!\n"; + errs() << "MachineFunction::viewCFGOnly is only available in debug builds on " + << "systems with Graphviz or gv!\n"; #endif // NDEBUG } @@ -324,35 +393,41 @@ void MachineFunction::viewCFGOnly() const /// create a corresponding virtual register for it. unsigned MachineFunction::addLiveIn(unsigned PReg, const TargetRegisterClass *RC) { - assert(RC->contains(PReg) && "Not the correct regclass!"); - unsigned VReg = getRegInfo().createVirtualRegister(RC); - getRegInfo().addLiveIn(PReg, VReg); + MachineRegisterInfo &MRI = getRegInfo(); + unsigned VReg = MRI.getLiveInVirtReg(PReg); + if (VReg) { + assert(MRI.getRegClass(VReg) == RC && "Register class mismatch!"); + return VReg; + } + VReg = MRI.createVirtualRegister(RC); + MRI.addLiveIn(PReg, VReg); return VReg; } -/// getOrCreateDebugLocID - Look up the DebugLocTuple index with the given -/// source file, line, and column. If none currently exists, create a new -/// DebugLocTuple, and insert it into the DebugIdMap. -unsigned MachineFunction::getOrCreateDebugLocID(GlobalVariable *CompileUnit, - unsigned Line, unsigned Col) { - DebugLocTuple Tuple(CompileUnit, Line, Col); - DenseMap::iterator II - = DebugLocInfo.DebugIdMap.find(Tuple); - if (II != DebugLocInfo.DebugIdMap.end()) - return II->second; - // Add a new tuple. - unsigned Id = DebugLocInfo.DebugLocations.size(); - DebugLocInfo.DebugLocations.push_back(Tuple); - DebugLocInfo.DebugIdMap[Tuple] = Id; - return Id; +/// getJTISymbol - Return the MCSymbol for the specified non-empty jump table. +/// If isLinkerPrivate is specified, an 'l' label is returned, otherwise a +/// normal 'L' label is returned. +MCSymbol *MachineFunction::getJTISymbol(unsigned JTI, MCContext &Ctx, + bool isLinkerPrivate) const { + assert(JumpTableInfo && "No jump tables"); + + assert(JTI < JumpTableInfo->getJumpTables().size() && "Invalid JTI!"); + const MCAsmInfo &MAI = *getTarget().getMCAsmInfo(); + + const char *Prefix = isLinkerPrivate ? MAI.getLinkerPrivateGlobalPrefix() : + MAI.getPrivateGlobalPrefix(); + SmallString<60> Name; + raw_svector_ostream(Name) + << Prefix << "JTI" << getFunctionNumber() << '_' << JTI; + return Ctx.GetOrCreateSymbol(Name.str()); } -/// getDebugLocTuple - Get the DebugLocTuple for a given DebugLoc object. -DebugLocTuple MachineFunction::getDebugLocTuple(DebugLoc DL) const { - unsigned Idx = DL.getIndex(); - assert(Idx < DebugLocInfo.DebugLocations.size() && - "Invalid index into debug locations!"); - return DebugLocInfo.DebugLocations[Idx]; +/// getPICBaseSymbol - Return a function-local symbol to represent the PIC +/// base. +MCSymbol *MachineFunction::getPICBaseSymbol() const { + const MCAsmInfo &MAI = *Target.getMCAsmInfo(); + return Ctx.GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix())+ + Twine(getFunctionNumber())+"$pb"); } //===----------------------------------------------------------------------===// @@ -367,7 +442,14 @@ DebugLocTuple MachineFunction::getDebugLocTuple(DebugLoc DL) const { int MachineFrameInfo::CreateFixedObject(uint64_t Size, int64_t SPOffset, bool Immutable) { assert(Size != 0 && "Cannot allocate zero size fixed stack objects!"); - Objects.insert(Objects.begin(), StackObject(Size, 1, SPOffset, Immutable)); + // The alignment of the frame index can be determined from its offset from + // the incoming frame position. If the frame object is at offset 32 and + // the stack is guaranteed to be 16-byte aligned, then we know that the + // object is 16-byte aligned. + unsigned StackAlign = TFI.getStackAlignment(); + unsigned Align = MinAlign(SPOffset, StackAlign); + Objects.insert(Objects.begin(), StackObject(Size, Align, SPOffset, Immutable, + /*isSS*/false, false)); return -++NumFixedObjects; } @@ -386,7 +468,7 @@ MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const { if (!isCalleeSavedInfoValid()) return BV; - for (const unsigned *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR) + for (const uint16_t *CSR = TRI->getCalleeSavedRegs(MF); CSR && *CSR; ++CSR) BV.set(*CSR); // The entry MBB always has all CSRs pristine. @@ -404,12 +486,16 @@ MachineFrameInfo::getPristineRegs(const MachineBasicBlock *MBB) const { void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{ - const TargetFrameInfo *FI = MF.getTarget().getFrameInfo(); + if (Objects.empty()) return; + + const TargetFrameLowering *FI = MF.getTarget().getFrameLowering(); int ValOffset = (FI ? FI->getOffsetOfLocalArea() : 0); + OS << "Frame Objects:\n"; + for (unsigned i = 0, e = Objects.size(); i != e; ++i) { const StackObject &SO = Objects[i]; - OS << " : "; + OS << " fi#" << (int)(i-NumFixedObjects) << ": "; if (SO.Size == ~0ULL) { OS << "dead\n"; continue; @@ -417,15 +503,14 @@ void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{ if (SO.Size == 0) OS << "variable sized"; else - OS << "size is " << SO.Size << " byte" << (SO.Size != 1 ? "s," : ","); - OS << " alignment is " << SO.Alignment << " byte" - << (SO.Alignment != 1 ? "s," : ","); + OS << "size=" << SO.Size; + OS << ", align=" << SO.Alignment; if (i < NumFixedObjects) - OS << " fixed"; + OS << ", fixed"; if (i < NumFixedObjects || SO.SPOffset != -1) { int64_t Off = SO.SPOffset - ValOffset; - OS << " at location [SP"; + OS << ", at location [SP"; if (Off > 0) OS << "+" << Off; else if (Off < 0) @@ -434,68 +519,115 @@ void MachineFrameInfo::print(const MachineFunction &MF, raw_ostream &OS) const{ } OS << "\n"; } - - if (HasVarSizedObjects) - OS << " Stack frame contains variable sized objects\n"; } void MachineFrameInfo::dump(const MachineFunction &MF) const { - print(MF, errs()); + print(MF, dbgs()); } //===----------------------------------------------------------------------===// // MachineJumpTableInfo implementation //===----------------------------------------------------------------------===// -/// getJumpTableIndex - Create a new jump table entry in the jump table info -/// or return an existing one. +/// getEntrySize - Return the size of each entry in the jump table. +unsigned MachineJumpTableInfo::getEntrySize(const TargetData &TD) const { + // The size of a jump table entry is 4 bytes unless the entry is just the + // address of a block, in which case it is the pointer size. + switch (getEntryKind()) { + case MachineJumpTableInfo::EK_BlockAddress: + return TD.getPointerSize(); + case MachineJumpTableInfo::EK_GPRel64BlockAddress: + return 8; + case MachineJumpTableInfo::EK_GPRel32BlockAddress: + case MachineJumpTableInfo::EK_LabelDifference32: + case MachineJumpTableInfo::EK_Custom32: + return 4; + case MachineJumpTableInfo::EK_Inline: + return 0; + } + llvm_unreachable("Unknown jump table encoding!"); +} + +/// getEntryAlignment - Return the alignment of each entry in the jump table. +unsigned MachineJumpTableInfo::getEntryAlignment(const TargetData &TD) const { + // The alignment of a jump table entry is the alignment of int32 unless the + // entry is just the address of a block, in which case it is the pointer + // alignment. + switch (getEntryKind()) { + case MachineJumpTableInfo::EK_BlockAddress: + return TD.getPointerABIAlignment(); + case MachineJumpTableInfo::EK_GPRel64BlockAddress: + return TD.getABIIntegerTypeAlignment(64); + case MachineJumpTableInfo::EK_GPRel32BlockAddress: + case MachineJumpTableInfo::EK_LabelDifference32: + case MachineJumpTableInfo::EK_Custom32: + return TD.getABIIntegerTypeAlignment(32); + case MachineJumpTableInfo::EK_Inline: + return 1; + } + llvm_unreachable("Unknown jump table encoding!"); +} + +/// createJumpTableIndex - Create a new jump table entry in the jump table info. /// -unsigned MachineJumpTableInfo::getJumpTableIndex( +unsigned MachineJumpTableInfo::createJumpTableIndex( const std::vector &DestBBs) { assert(!DestBBs.empty() && "Cannot create an empty jump table!"); - for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) - if (JumpTables[i].MBBs == DestBBs) - return i; - JumpTables.push_back(MachineJumpTableEntry(DestBBs)); return JumpTables.size()-1; } /// ReplaceMBBInJumpTables - If Old is the target of any jump tables, update /// the jump tables to branch to New instead. -bool -MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old, - MachineBasicBlock *New) { +bool MachineJumpTableInfo::ReplaceMBBInJumpTables(MachineBasicBlock *Old, + MachineBasicBlock *New) { assert(Old != New && "Not making a change?"); bool MadeChange = false; - for (size_t i = 0, e = JumpTables.size(); i != e; ++i) { - MachineJumpTableEntry &JTE = JumpTables[i]; - for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j) - if (JTE.MBBs[j] == Old) { - JTE.MBBs[j] = New; - MadeChange = true; - } - } + for (size_t i = 0, e = JumpTables.size(); i != e; ++i) + ReplaceMBBInJumpTable(i, Old, New); + return MadeChange; +} + +/// ReplaceMBBInJumpTable - If Old is a target of the jump tables, update +/// the jump table to branch to New instead. +bool MachineJumpTableInfo::ReplaceMBBInJumpTable(unsigned Idx, + MachineBasicBlock *Old, + MachineBasicBlock *New) { + assert(Old != New && "Not making a change?"); + bool MadeChange = false; + MachineJumpTableEntry &JTE = JumpTables[Idx]; + for (size_t j = 0, e = JTE.MBBs.size(); j != e; ++j) + if (JTE.MBBs[j] == Old) { + JTE.MBBs[j] = New; + MadeChange = true; + } return MadeChange; } void MachineJumpTableInfo::print(raw_ostream &OS) const { - // FIXME: this is lame, maybe we could print out the MBB numbers or something - // like {1, 2, 4, 5, 3, 0} + if (JumpTables.empty()) return; + + OS << "Jump Tables:\n"; + for (unsigned i = 0, e = JumpTables.size(); i != e; ++i) { - OS << " has " << JumpTables[i].MBBs.size() - << " entries\n"; + OS << " jt#" << i << ": "; + for (unsigned j = 0, f = JumpTables[i].MBBs.size(); j != f; ++j) + OS << " BB#" << JumpTables[i].MBBs[j]->getNumber(); } + + OS << '\n'; } -void MachineJumpTableInfo::dump() const { print(errs()); } +void MachineJumpTableInfo::dump() const { print(dbgs()); } //===----------------------------------------------------------------------===// // MachineConstantPool implementation //===----------------------------------------------------------------------===// -const Type *MachineConstantPoolEntry::getType() const { +void MachineConstantPoolValue::anchor() { } + +Type *MachineConstantPoolEntry::getType() const { if (isMachineConstantPoolEntry()) return Val.MachineCPVal->getType(); return Val.ConstVal->getType(); @@ -512,24 +644,75 @@ MachineConstantPool::~MachineConstantPool() { for (unsigned i = 0, e = Constants.size(); i != e; ++i) if (Constants[i].isMachineConstantPoolEntry()) delete Constants[i].Val.MachineCPVal; + for (DenseSet::iterator I = + MachineCPVsSharingEntries.begin(), E = MachineCPVsSharingEntries.end(); + I != E; ++I) + delete *I; +} + +/// CanShareConstantPoolEntry - Test whether the given two constants +/// can be allocated the same constant pool entry. +static bool CanShareConstantPoolEntry(const Constant *A, const Constant *B, + const TargetData *TD) { + // Handle the trivial case quickly. + if (A == B) return true; + + // If they have the same type but weren't the same constant, quickly + // reject them. + if (A->getType() == B->getType()) return false; + + // We can't handle structs or arrays. + if (isa(A->getType()) || isa(A->getType()) || + isa(B->getType()) || isa(B->getType())) + return false; + + // For now, only support constants with the same size. + uint64_t StoreSize = TD->getTypeStoreSize(A->getType()); + if (StoreSize != TD->getTypeStoreSize(B->getType()) || + StoreSize > 128) + return false; + + Type *IntTy = IntegerType::get(A->getContext(), StoreSize*8); + + // Try constant folding a bitcast of both instructions to an integer. If we + // get two identical ConstantInt's, then we are good to share them. We use + // the constant folding APIs to do this so that we get the benefit of + // TargetData. + if (isa(A->getType())) + A = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy, + const_cast(A), TD); + else if (A->getType() != IntTy) + A = ConstantFoldInstOperands(Instruction::BitCast, IntTy, + const_cast(A), TD); + if (isa(B->getType())) + B = ConstantFoldInstOperands(Instruction::PtrToInt, IntTy, + const_cast(B), TD); + else if (B->getType() != IntTy) + B = ConstantFoldInstOperands(Instruction::BitCast, IntTy, + const_cast(B), TD); + + return A == B; } /// getConstantPoolIndex - Create a new entry in the constant pool or return /// an existing one. User must specify the log2 of the minimum required /// alignment for the object. /// -unsigned MachineConstantPool::getConstantPoolIndex(Constant *C, +unsigned MachineConstantPool::getConstantPoolIndex(const Constant *C, unsigned Alignment) { assert(Alignment && "Alignment must be specified!"); if (Alignment > PoolAlignment) PoolAlignment = Alignment; - + // Check to see if we already have this constant. // // FIXME, this could be made much more efficient for large constant pools. for (unsigned i = 0, e = Constants.size(); i != e; ++i) - if (Constants[i].Val.ConstVal == C && - (Constants[i].getAlignment() & (Alignment - 1)) == 0) + if (!Constants[i].isMachineConstantPoolEntry() && + CanShareConstantPoolEntry(Constants[i].Val.ConstVal, C, TD)) { + if ((unsigned)Constants[i].getAlignment() < Alignment) + Constants[i].Alignment = Alignment; return i; + } Constants.push_back(MachineConstantPoolEntry(C, Alignment)); return Constants.size()-1; @@ -544,23 +727,28 @@ unsigned MachineConstantPool::getConstantPoolIndex(MachineConstantPoolValue *V, // // FIXME, this could be made much more efficient for large constant pools. int Idx = V->getExistingMachineCPValue(this, Alignment); - if (Idx != -1) + if (Idx != -1) { + MachineCPVsSharingEntries.insert(V); return (unsigned)Idx; + } Constants.push_back(MachineConstantPoolEntry(V, Alignment)); return Constants.size()-1; } void MachineConstantPool::print(raw_ostream &OS) const { + if (Constants.empty()) return; + + OS << "Constant Pool:\n"; for (unsigned i = 0, e = Constants.size(); i != e; ++i) { - OS << " is"; + OS << " cp#" << i << ": "; if (Constants[i].isMachineConstantPoolEntry()) Constants[i].Val.MachineCPVal->print(OS); else OS << *(Value*)Constants[i].Val.ConstVal; - OS << " , alignment=" << Constants[i].getAlignment(); + OS << ", align=" << Constants[i].getAlignment(); OS << "\n"; } } -void MachineConstantPool::dump() const { print(errs()); } +void MachineConstantPool::dump() const { print(dbgs()); }