X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FVMCore%2FInstruction.cpp;h=e19ad1c16f9e78e71ed3b0a06ed6fc2799577dd9;hb=98c65173bb27e1df4ebe87f8c864d6dc197209ca;hp=067a4bb639f869c781b1f5f49ba0f5fa71501c63;hpb=95c2cc51ebb2a58ccd66a1465d5c8ed89b381bc9;p=oota-llvm.git diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp index 067a4bb639f..e19ad1c16f9 100644 --- a/lib/VMCore/Instruction.cpp +++ b/lib/VMCore/Instruction.cpp @@ -14,6 +14,8 @@ #include "llvm/Type.h" #include "llvm/Instructions.h" #include "llvm/Function.h" +#include "llvm/Constants.h" +#include "llvm/GlobalVariable.h" #include "llvm/Support/CallSite.h" #include "llvm/Support/LeakDetector.h" using namespace llvm; @@ -74,6 +76,12 @@ void Instruction::insertBefore(Instruction *InsertPos) { InsertPos->getParent()->getInstList().insert(InsertPos, this); } +/// insertAfter - Insert an unlinked instructions into a basic block +/// immediately after the specified instruction. +void Instruction::insertAfter(Instruction *InsertPos) { + InsertPos->getParent()->getInstList().insertAfter(InsertPos, this); +} + /// moveBefore - Unlink this instruction from its current basic block and /// insert it into the basic block that MovePos lives in, right before /// MovePos. @@ -95,8 +103,11 @@ const char *Instruction::getOpcodeName(unsigned OpCode) { // Standard binary operators... case Add: return "add"; + case FAdd: return "fadd"; case Sub: return "sub"; + case FSub: return "fsub"; case Mul: return "mul"; + case FMul: return "fmul"; case UDiv: return "udiv"; case SDiv: return "sdiv"; case FDiv: return "fdiv"; @@ -134,8 +145,6 @@ const char *Instruction::getOpcodeName(unsigned OpCode) { // Other instructions... case ICmp: return "icmp"; case FCmp: return "fcmp"; - case VICmp: return "vicmp"; - case VFCmp: return "vfcmp"; case PHI: return "phi"; case Select: return "select"; case Call: return "call"; @@ -158,7 +167,7 @@ const char *Instruction::getOpcodeName(unsigned OpCode) { /// isIdenticalTo - Return true if the specified instruction is exactly /// identical to the current one. This means that all operands match and any /// extra information (e.g. load is volatile) agree. -bool Instruction::isIdenticalTo(Instruction *I) const { +bool Instruction::isIdenticalTo(const Instruction *I) const { if (getOpcode() != I->getOpcode() || getNumOperands() != I->getNumOperands() || getType() != I->getType()) @@ -172,20 +181,49 @@ bool Instruction::isIdenticalTo(Instruction *I) const { // Check special state that is a part of some instructions. if (const LoadInst *LI = dyn_cast(this)) - return LI->isVolatile() == cast(I)->isVolatile(); + return LI->isVolatile() == cast(I)->isVolatile() && + LI->getAlignment() == cast(I)->getAlignment(); if (const StoreInst *SI = dyn_cast(this)) - return SI->isVolatile() == cast(I)->isVolatile(); + return SI->isVolatile() == cast(I)->isVolatile() && + SI->getAlignment() == cast(I)->getAlignment(); if (const CmpInst *CI = dyn_cast(this)) return CI->getPredicate() == cast(I)->getPredicate(); if (const CallInst *CI = dyn_cast(this)) - return CI->isTailCall() == cast(I)->isTailCall(); + return CI->isTailCall() == cast(I)->isTailCall() && + CI->getCallingConv() == cast(I)->getCallingConv() && + CI->getAttributes().getRawPointer() == + cast(I)->getAttributes().getRawPointer(); + if (const InvokeInst *CI = dyn_cast(this)) + return CI->getCallingConv() == cast(I)->getCallingConv() && + CI->getAttributes().getRawPointer() == + cast(I)->getAttributes().getRawPointer(); + if (const InsertValueInst *IVI = dyn_cast(this)) { + if (IVI->getNumIndices() != cast(I)->getNumIndices()) + return false; + for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i) + if (IVI->idx_begin()[i] != cast(I)->idx_begin()[i]) + return false; + return true; + } + if (const ExtractValueInst *EVI = dyn_cast(this)) { + if (EVI->getNumIndices() != cast(I)->getNumIndices()) + return false; + for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i) + if (EVI->idx_begin()[i] != cast(I)->idx_begin()[i]) + return false; + return true; + } + return true; } // isSameOperationAs -bool Instruction::isSameOperationAs(Instruction *I) const { - if (getOpcode() != I->getOpcode() || getType() != I->getType() || - getNumOperands() != I->getNumOperands()) +// This should be kept in sync with isEquivalentOperation in +// lib/Transforms/IPO/MergeFunctions.cpp. +bool Instruction::isSameOperationAs(const Instruction *I) const { + if (getOpcode() != I->getOpcode() || + getNumOperands() != I->getNumOperands() || + getType() != I->getType()) return false; // We have two instructions of identical opcode and #operands. Check to see @@ -196,13 +234,38 @@ bool Instruction::isSameOperationAs(Instruction *I) const { // Check special state that is a part of some instructions. if (const LoadInst *LI = dyn_cast(this)) - return LI->isVolatile() == cast(I)->isVolatile(); + return LI->isVolatile() == cast(I)->isVolatile() && + LI->getAlignment() == cast(I)->getAlignment(); if (const StoreInst *SI = dyn_cast(this)) - return SI->isVolatile() == cast(I)->isVolatile(); + return SI->isVolatile() == cast(I)->isVolatile() && + SI->getAlignment() == cast(I)->getAlignment(); if (const CmpInst *CI = dyn_cast(this)) return CI->getPredicate() == cast(I)->getPredicate(); if (const CallInst *CI = dyn_cast(this)) - return CI->isTailCall() == cast(I)->isTailCall(); + return CI->isTailCall() == cast(I)->isTailCall() && + CI->getCallingConv() == cast(I)->getCallingConv() && + CI->getAttributes().getRawPointer() == + cast(I)->getAttributes().getRawPointer(); + if (const InvokeInst *CI = dyn_cast(this)) + return CI->getCallingConv() == cast(I)->getCallingConv() && + CI->getAttributes().getRawPointer() == + cast(I)->getAttributes().getRawPointer(); + if (const InsertValueInst *IVI = dyn_cast(this)) { + if (IVI->getNumIndices() != cast(I)->getNumIndices()) + return false; + for (unsigned i = 0, e = IVI->getNumIndices(); i != e; ++i) + if (IVI->idx_begin()[i] != cast(I)->idx_begin()[i]) + return false; + return true; + } + if (const ExtractValueInst *EVI = dyn_cast(this)) { + if (EVI->getNumIndices() != cast(I)->getNumIndices()) + return false; + for (unsigned i = 0, e = EVI->getNumIndices(); i != e; ++i) + if (EVI->idx_begin()[i] != cast(I)->idx_begin()[i]) + return false; + return true; + } return true; } @@ -221,8 +284,7 @@ bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const { continue; } - unsigned UseOperand = UI.getOperandNo(); - if (PN->getIncomingBlock(UseOperand/2) != BB) + if (PN->getIncomingBlock(UI) != BB) return true; } return false; @@ -264,21 +326,23 @@ bool Instruction::mayWriteToMemory() const { } } +/// mayThrow - Return true if this instruction may throw an exception. +/// +bool Instruction::mayThrow() const { + if (const CallInst *CI = dyn_cast(this)) + return !CI->doesNotThrow(); + return false; +} + /// isAssociative - Return true if the instruction is associative: /// -/// Associative operators satisfy: x op (y op z) === (x op y) op z) +/// Associative operators satisfy: x op (y op z) === (x op y) op z /// -/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative, when not -/// applied to floating point types. +/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative. /// bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) { - if (Opcode == And || Opcode == Or || Opcode == Xor) - return true; - - // Add/Mul reassociate unless they are FP or FP vectors. - if (Opcode == Add || Opcode == Mul) - return !Ty->isFPOrFPVector(); - return 0; + return Opcode == And || Opcode == Or || Opcode == Xor || + Opcode == Add || Opcode == Mul; } /// isCommutative - Return true if the instruction is commutative: @@ -291,7 +355,9 @@ bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) { bool Instruction::isCommutative(unsigned op) { switch (op) { case Add: + case FAdd: case Mul: + case FMul: case And: case Or: case Xor: @@ -301,23 +367,56 @@ bool Instruction::isCommutative(unsigned op) { } } -/// isTrapping - Return true if the instruction may trap. -/// -bool Instruction::isTrapping(unsigned op) { - switch(op) { +bool Instruction::isSafeToSpeculativelyExecute() const { + for (unsigned i = 0, e = getNumOperands(); i != e; ++i) + if (Constant *C = dyn_cast(getOperand(i))) + if (C->canTrap()) + return false; + + switch (getOpcode()) { + default: + return true; case UDiv: + case URem: { + // x / y is undefined if y == 0, but calcuations like x / 3 are safe. + ConstantInt *Op = dyn_cast(getOperand(1)); + return Op && !Op->isNullValue(); + } case SDiv: - case FDiv: - case URem: - case SRem: - case FRem: - case Load: - case Store: + case SRem: { + // x / y is undefined if y == 0, and might be undefined if y == -1, + // but calcuations like x / 3 are safe. + ConstantInt *Op = dyn_cast(getOperand(1)); + return Op && !Op->isNullValue() && !Op->isAllOnesValue(); + } + case Load: { + if (cast(this)->isVolatile()) + return false; + if (isa(getOperand(0))) + return true; + if (GlobalVariable *GV = dyn_cast(getOperand(0))) + return !GV->hasExternalWeakLinkage(); + // FIXME: Handle cases involving GEPs. We have to be careful because + // a load of a out-of-bounds GEP has undefined behavior. + return false; + } case Call: - case Invoke: + return false; // The called function could have undefined behavior or + // side-effects. + // FIXME: We should special-case some intrinsics (bswap, + // overflow-checking arithmetic, etc.) case VAArg: - return true; - default: - return false; + case Alloca: + case Malloc: + case Invoke: + case PHI: + case Store: + case Free: + case Ret: + case Br: + case Switch: + case Unwind: + case Unreachable: + return false; // Misc instructions which have effects } }