139f7f9bf5
upcoming 3.3 release (branching and freezing expected in a few weeks). Preliminary release notes can be found at the usual location: <http://llvm.org/docs/ReleaseNotes.html> An MFC is planned once the actual 3.3 release is finished.
559 lines
18 KiB
C++
559 lines
18 KiB
C++
//===- llvm/Analysis/TargetTransformInfo.cpp ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "tti"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Operator.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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// Setup the analysis group to manage the TargetTransformInfo passes.
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INITIALIZE_ANALYSIS_GROUP(TargetTransformInfo, "Target Information", NoTTI)
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char TargetTransformInfo::ID = 0;
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TargetTransformInfo::~TargetTransformInfo() {
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}
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void TargetTransformInfo::pushTTIStack(Pass *P) {
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TopTTI = this;
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PrevTTI = &P->getAnalysis<TargetTransformInfo>();
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// Walk up the chain and update the top TTI pointer.
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for (TargetTransformInfo *PTTI = PrevTTI; PTTI; PTTI = PTTI->PrevTTI)
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PTTI->TopTTI = this;
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}
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void TargetTransformInfo::popTTIStack() {
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TopTTI = 0;
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// Walk up the chain and update the top TTI pointer.
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for (TargetTransformInfo *PTTI = PrevTTI; PTTI; PTTI = PTTI->PrevTTI)
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PTTI->TopTTI = PrevTTI;
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PrevTTI = 0;
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}
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void TargetTransformInfo::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<TargetTransformInfo>();
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}
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unsigned TargetTransformInfo::getOperationCost(unsigned Opcode, Type *Ty,
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Type *OpTy) const {
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return PrevTTI->getOperationCost(Opcode, Ty, OpTy);
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}
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unsigned TargetTransformInfo::getGEPCost(
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const Value *Ptr, ArrayRef<const Value *> Operands) const {
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return PrevTTI->getGEPCost(Ptr, Operands);
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}
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unsigned TargetTransformInfo::getCallCost(FunctionType *FTy,
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int NumArgs) const {
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return PrevTTI->getCallCost(FTy, NumArgs);
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}
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unsigned TargetTransformInfo::getCallCost(const Function *F,
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int NumArgs) const {
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return PrevTTI->getCallCost(F, NumArgs);
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}
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unsigned TargetTransformInfo::getCallCost(
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const Function *F, ArrayRef<const Value *> Arguments) const {
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return PrevTTI->getCallCost(F, Arguments);
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}
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unsigned TargetTransformInfo::getIntrinsicCost(
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Intrinsic::ID IID, Type *RetTy, ArrayRef<Type *> ParamTys) const {
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return PrevTTI->getIntrinsicCost(IID, RetTy, ParamTys);
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}
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unsigned TargetTransformInfo::getIntrinsicCost(
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Intrinsic::ID IID, Type *RetTy, ArrayRef<const Value *> Arguments) const {
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return PrevTTI->getIntrinsicCost(IID, RetTy, Arguments);
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}
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unsigned TargetTransformInfo::getUserCost(const User *U) const {
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return PrevTTI->getUserCost(U);
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}
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bool TargetTransformInfo::isLoweredToCall(const Function *F) const {
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return PrevTTI->isLoweredToCall(F);
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}
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bool TargetTransformInfo::isLegalAddImmediate(int64_t Imm) const {
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return PrevTTI->isLegalAddImmediate(Imm);
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}
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bool TargetTransformInfo::isLegalICmpImmediate(int64_t Imm) const {
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return PrevTTI->isLegalICmpImmediate(Imm);
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}
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bool TargetTransformInfo::isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV,
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int64_t BaseOffset,
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bool HasBaseReg,
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int64_t Scale) const {
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return PrevTTI->isLegalAddressingMode(Ty, BaseGV, BaseOffset, HasBaseReg,
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Scale);
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}
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bool TargetTransformInfo::isTruncateFree(Type *Ty1, Type *Ty2) const {
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return PrevTTI->isTruncateFree(Ty1, Ty2);
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}
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bool TargetTransformInfo::isTypeLegal(Type *Ty) const {
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return PrevTTI->isTypeLegal(Ty);
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}
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unsigned TargetTransformInfo::getJumpBufAlignment() const {
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return PrevTTI->getJumpBufAlignment();
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}
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unsigned TargetTransformInfo::getJumpBufSize() const {
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return PrevTTI->getJumpBufSize();
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}
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bool TargetTransformInfo::shouldBuildLookupTables() const {
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return PrevTTI->shouldBuildLookupTables();
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}
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TargetTransformInfo::PopcntSupportKind
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TargetTransformInfo::getPopcntSupport(unsigned IntTyWidthInBit) const {
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return PrevTTI->getPopcntSupport(IntTyWidthInBit);
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}
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unsigned TargetTransformInfo::getIntImmCost(const APInt &Imm, Type *Ty) const {
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return PrevTTI->getIntImmCost(Imm, Ty);
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}
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unsigned TargetTransformInfo::getNumberOfRegisters(bool Vector) const {
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return PrevTTI->getNumberOfRegisters(Vector);
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}
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unsigned TargetTransformInfo::getRegisterBitWidth(bool Vector) const {
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return PrevTTI->getRegisterBitWidth(Vector);
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}
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unsigned TargetTransformInfo::getMaximumUnrollFactor() const {
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return PrevTTI->getMaximumUnrollFactor();
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}
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unsigned TargetTransformInfo::getArithmeticInstrCost(unsigned Opcode,
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Type *Ty,
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OperandValueKind Op1Info,
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OperandValueKind Op2Info) const {
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return PrevTTI->getArithmeticInstrCost(Opcode, Ty, Op1Info, Op2Info);
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}
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unsigned TargetTransformInfo::getShuffleCost(ShuffleKind Kind, Type *Tp,
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int Index, Type *SubTp) const {
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return PrevTTI->getShuffleCost(Kind, Tp, Index, SubTp);
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}
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unsigned TargetTransformInfo::getCastInstrCost(unsigned Opcode, Type *Dst,
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Type *Src) const {
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return PrevTTI->getCastInstrCost(Opcode, Dst, Src);
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}
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unsigned TargetTransformInfo::getCFInstrCost(unsigned Opcode) const {
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return PrevTTI->getCFInstrCost(Opcode);
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}
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unsigned TargetTransformInfo::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
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Type *CondTy) const {
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return PrevTTI->getCmpSelInstrCost(Opcode, ValTy, CondTy);
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}
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unsigned TargetTransformInfo::getVectorInstrCost(unsigned Opcode, Type *Val,
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unsigned Index) const {
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return PrevTTI->getVectorInstrCost(Opcode, Val, Index);
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}
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unsigned TargetTransformInfo::getMemoryOpCost(unsigned Opcode, Type *Src,
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unsigned Alignment,
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unsigned AddressSpace) const {
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return PrevTTI->getMemoryOpCost(Opcode, Src, Alignment, AddressSpace);
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;
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}
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unsigned
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TargetTransformInfo::getIntrinsicInstrCost(Intrinsic::ID ID,
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Type *RetTy,
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ArrayRef<Type *> Tys) const {
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return PrevTTI->getIntrinsicInstrCost(ID, RetTy, Tys);
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}
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unsigned TargetTransformInfo::getNumberOfParts(Type *Tp) const {
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return PrevTTI->getNumberOfParts(Tp);
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}
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unsigned TargetTransformInfo::getAddressComputationCost(Type *Tp) const {
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return PrevTTI->getAddressComputationCost(Tp);
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}
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namespace {
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struct NoTTI : ImmutablePass, TargetTransformInfo {
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const DataLayout *DL;
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NoTTI() : ImmutablePass(ID), DL(0) {
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initializeNoTTIPass(*PassRegistry::getPassRegistry());
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}
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virtual void initializePass() {
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// Note that this subclass is special, and must *not* call initializeTTI as
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// it does not chain.
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TopTTI = this;
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PrevTTI = 0;
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DL = getAnalysisIfAvailable<DataLayout>();
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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// Note that this subclass is special, and must *not* call
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// TTI::getAnalysisUsage as it breaks the recursion.
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}
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/// Pass identification.
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static char ID;
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/// Provide necessary pointer adjustments for the two base classes.
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virtual void *getAdjustedAnalysisPointer(const void *ID) {
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if (ID == &TargetTransformInfo::ID)
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return (TargetTransformInfo*)this;
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return this;
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}
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unsigned getOperationCost(unsigned Opcode, Type *Ty, Type *OpTy) const {
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switch (Opcode) {
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default:
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// By default, just classify everything as 'basic'.
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return TCC_Basic;
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case Instruction::GetElementPtr:
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llvm_unreachable("Use getGEPCost for GEP operations!");
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case Instruction::BitCast:
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assert(OpTy && "Cast instructions must provide the operand type");
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if (Ty == OpTy || (Ty->isPointerTy() && OpTy->isPointerTy()))
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// Identity and pointer-to-pointer casts are free.
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return TCC_Free;
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// Otherwise, the default basic cost is used.
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return TCC_Basic;
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case Instruction::IntToPtr:
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// An inttoptr cast is free so long as the input is a legal integer type
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// which doesn't contain values outside the range of a pointer.
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if (DL && DL->isLegalInteger(OpTy->getScalarSizeInBits()) &&
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OpTy->getScalarSizeInBits() <= DL->getPointerSizeInBits())
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return TCC_Free;
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// Otherwise it's not a no-op.
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return TCC_Basic;
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case Instruction::PtrToInt:
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// A ptrtoint cast is free so long as the result is large enough to store
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// the pointer, and a legal integer type.
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if (DL && DL->isLegalInteger(Ty->getScalarSizeInBits()) &&
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Ty->getScalarSizeInBits() >= DL->getPointerSizeInBits())
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return TCC_Free;
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// Otherwise it's not a no-op.
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return TCC_Basic;
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case Instruction::Trunc:
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// trunc to a native type is free (assuming the target has compare and
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// shift-right of the same width).
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if (DL && DL->isLegalInteger(DL->getTypeSizeInBits(Ty)))
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return TCC_Free;
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return TCC_Basic;
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}
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}
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unsigned getGEPCost(const Value *Ptr,
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ArrayRef<const Value *> Operands) const {
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// In the basic model, we just assume that all-constant GEPs will be folded
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// into their uses via addressing modes.
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for (unsigned Idx = 0, Size = Operands.size(); Idx != Size; ++Idx)
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if (!isa<Constant>(Operands[Idx]))
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return TCC_Basic;
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return TCC_Free;
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}
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unsigned getCallCost(FunctionType *FTy, int NumArgs = -1) const {
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assert(FTy && "FunctionType must be provided to this routine.");
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// The target-independent implementation just measures the size of the
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// function by approximating that each argument will take on average one
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// instruction to prepare.
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if (NumArgs < 0)
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// Set the argument number to the number of explicit arguments in the
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// function.
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NumArgs = FTy->getNumParams();
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return TCC_Basic * (NumArgs + 1);
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}
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unsigned getCallCost(const Function *F, int NumArgs = -1) const {
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assert(F && "A concrete function must be provided to this routine.");
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if (NumArgs < 0)
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// Set the argument number to the number of explicit arguments in the
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// function.
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NumArgs = F->arg_size();
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if (Intrinsic::ID IID = (Intrinsic::ID)F->getIntrinsicID()) {
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FunctionType *FTy = F->getFunctionType();
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SmallVector<Type *, 8> ParamTys(FTy->param_begin(), FTy->param_end());
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return TopTTI->getIntrinsicCost(IID, FTy->getReturnType(), ParamTys);
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}
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if (!TopTTI->isLoweredToCall(F))
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return TCC_Basic; // Give a basic cost if it will be lowered directly.
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return TopTTI->getCallCost(F->getFunctionType(), NumArgs);
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}
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unsigned getCallCost(const Function *F,
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ArrayRef<const Value *> Arguments) const {
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// Simply delegate to generic handling of the call.
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// FIXME: We should use instsimplify or something else to catch calls which
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// will constant fold with these arguments.
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return TopTTI->getCallCost(F, Arguments.size());
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}
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unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
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ArrayRef<Type *> ParamTys) const {
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switch (IID) {
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default:
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// Intrinsics rarely (if ever) have normal argument setup constraints.
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// Model them as having a basic instruction cost.
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// FIXME: This is wrong for libc intrinsics.
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return TCC_Basic;
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case Intrinsic::dbg_declare:
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case Intrinsic::dbg_value:
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case Intrinsic::invariant_start:
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case Intrinsic::invariant_end:
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case Intrinsic::lifetime_start:
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case Intrinsic::lifetime_end:
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case Intrinsic::objectsize:
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case Intrinsic::ptr_annotation:
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case Intrinsic::var_annotation:
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// These intrinsics don't actually represent code after lowering.
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return TCC_Free;
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}
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}
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unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
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ArrayRef<const Value *> Arguments) const {
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// Delegate to the generic intrinsic handling code. This mostly provides an
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// opportunity for targets to (for example) special case the cost of
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// certain intrinsics based on constants used as arguments.
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SmallVector<Type *, 8> ParamTys;
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ParamTys.reserve(Arguments.size());
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for (unsigned Idx = 0, Size = Arguments.size(); Idx != Size; ++Idx)
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ParamTys.push_back(Arguments[Idx]->getType());
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return TopTTI->getIntrinsicCost(IID, RetTy, ParamTys);
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}
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unsigned getUserCost(const User *U) const {
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if (isa<PHINode>(U))
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return TCC_Free; // Model all PHI nodes as free.
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if (const GEPOperator *GEP = dyn_cast<GEPOperator>(U))
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// In the basic model we just assume that all-constant GEPs will be
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// folded into their uses via addressing modes.
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return GEP->hasAllConstantIndices() ? TCC_Free : TCC_Basic;
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if (ImmutableCallSite CS = U) {
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const Function *F = CS.getCalledFunction();
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if (!F) {
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// Just use the called value type.
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Type *FTy = CS.getCalledValue()->getType()->getPointerElementType();
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return TopTTI->getCallCost(cast<FunctionType>(FTy), CS.arg_size());
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}
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SmallVector<const Value *, 8> Arguments;
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for (ImmutableCallSite::arg_iterator AI = CS.arg_begin(),
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AE = CS.arg_end();
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AI != AE; ++AI)
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Arguments.push_back(*AI);
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return TopTTI->getCallCost(F, Arguments);
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}
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if (const CastInst *CI = dyn_cast<CastInst>(U)) {
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// Result of a cmp instruction is often extended (to be used by other
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// cmp instructions, logical or return instructions). These are usually
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// nop on most sane targets.
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if (isa<CmpInst>(CI->getOperand(0)))
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return TCC_Free;
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}
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// Otherwise delegate to the fully generic implementations.
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return getOperationCost(Operator::getOpcode(U), U->getType(),
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U->getNumOperands() == 1 ?
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U->getOperand(0)->getType() : 0);
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}
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bool isLoweredToCall(const Function *F) const {
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// FIXME: These should almost certainly not be handled here, and instead
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// handled with the help of TLI or the target itself. This was largely
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// ported from existing analysis heuristics here so that such refactorings
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// can take place in the future.
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if (F->isIntrinsic())
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return false;
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if (F->hasLocalLinkage() || !F->hasName())
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return true;
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StringRef Name = F->getName();
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// These will all likely lower to a single selection DAG node.
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if (Name == "copysign" || Name == "copysignf" || Name == "copysignl" ||
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Name == "fabs" || Name == "fabsf" || Name == "fabsl" || Name == "sin" ||
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Name == "sinf" || Name == "sinl" || Name == "cos" || Name == "cosf" ||
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Name == "cosl" || Name == "sqrt" || Name == "sqrtf" || Name == "sqrtl")
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return false;
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// These are all likely to be optimized into something smaller.
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if (Name == "pow" || Name == "powf" || Name == "powl" || Name == "exp2" ||
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Name == "exp2l" || Name == "exp2f" || Name == "floor" || Name ==
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"floorf" || Name == "ceil" || Name == "round" || Name == "ffs" ||
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Name == "ffsl" || Name == "abs" || Name == "labs" || Name == "llabs")
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return false;
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return true;
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}
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bool isLegalAddImmediate(int64_t Imm) const {
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return false;
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}
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bool isLegalICmpImmediate(int64_t Imm) const {
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return false;
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}
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bool isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV, int64_t BaseOffset,
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bool HasBaseReg, int64_t Scale) const {
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// Guess that reg+reg addressing is allowed. This heuristic is taken from
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// the implementation of LSR.
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return !BaseGV && BaseOffset == 0 && Scale <= 1;
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}
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bool isTruncateFree(Type *Ty1, Type *Ty2) const {
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return false;
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}
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bool isTypeLegal(Type *Ty) const {
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return false;
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}
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unsigned getJumpBufAlignment() const {
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return 0;
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}
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unsigned getJumpBufSize() const {
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return 0;
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}
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bool shouldBuildLookupTables() const {
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return true;
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}
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PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const {
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return PSK_Software;
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}
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unsigned getIntImmCost(const APInt &Imm, Type *Ty) const {
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return 1;
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}
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unsigned getNumberOfRegisters(bool Vector) const {
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return 8;
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}
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unsigned getRegisterBitWidth(bool Vector) const {
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return 32;
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}
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unsigned getMaximumUnrollFactor() const {
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return 1;
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}
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unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty, OperandValueKind,
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OperandValueKind) const {
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return 1;
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}
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unsigned getShuffleCost(ShuffleKind Kind, Type *Tp,
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int Index = 0, Type *SubTp = 0) const {
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return 1;
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}
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unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
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Type *Src) const {
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|
return 1;
|
|
}
|
|
|
|
unsigned getCFInstrCost(unsigned Opcode) const {
|
|
return 1;
|
|
}
|
|
|
|
unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
|
|
Type *CondTy = 0) const {
|
|
return 1;
|
|
}
|
|
|
|
unsigned getVectorInstrCost(unsigned Opcode, Type *Val,
|
|
unsigned Index = -1) const {
|
|
return 1;
|
|
}
|
|
|
|
unsigned getMemoryOpCost(unsigned Opcode, Type *Src,
|
|
unsigned Alignment,
|
|
unsigned AddressSpace) const {
|
|
return 1;
|
|
}
|
|
|
|
unsigned getIntrinsicInstrCost(Intrinsic::ID ID,
|
|
Type *RetTy,
|
|
ArrayRef<Type*> Tys) const {
|
|
return 1;
|
|
}
|
|
|
|
unsigned getNumberOfParts(Type *Tp) const {
|
|
return 0;
|
|
}
|
|
|
|
unsigned getAddressComputationCost(Type *Tp) const {
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
} // end anonymous namespace
|
|
|
|
INITIALIZE_AG_PASS(NoTTI, TargetTransformInfo, "notti",
|
|
"No target information", true, true, true)
|
|
char NoTTI::ID = 0;
|
|
|
|
ImmutablePass *llvm::createNoTargetTransformInfoPass() {
|
|
return new NoTTI();
|
|
}
|