mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 21:29:28 +00:00
1e05bd9e71
lowered cost. Currently, this is a direct port of the logic implementing isInstructionFree in CodeMetrics. The hope is that the interface can be improved (f.ex. supporting un-formed instruction queries) and the implementation abstracted so that as we have test cases and target knowledge we can expose increasingly accurate heuristics to clients. I'll start switching existing consumers over and kill off the routine in CodeMetrics in subsequent commits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172998 91177308-0d34-0410-b5e6-96231b3b80d8
410 lines
12 KiB
C++
410 lines
12 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/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::getUserCost(const User *U) const {
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return PrevTTI->getUserCost(U);
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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) const {
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return PrevTTI->getArithmeticInstrCost(Opcode, Ty);
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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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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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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(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::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 getUserCost(const User *U) const {
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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 we have a call of an intrinsic we can provide more detailed analysis
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// by inspecting the particular intrinsic called.
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// FIXME: Hoist this out into a getIntrinsicCost routine.
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if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(U)) {
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switch (II->getIntrinsicID()) {
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default:
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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 count as size.
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return TCC_Free;
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}
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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 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) 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;
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}
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unsigned getCFInstrCost(unsigned Opcode) const {
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return 1;
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}
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unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
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Type *CondTy = 0) const {
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return 1;
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}
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unsigned getVectorInstrCost(unsigned Opcode, Type *Val,
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unsigned Index = -1) const {
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return 1;
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}
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unsigned getMemoryOpCost(unsigned Opcode, Type *Src,
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unsigned Alignment,
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unsigned AddressSpace) const {
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return 1;
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}
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unsigned getIntrinsicInstrCost(Intrinsic::ID ID,
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Type *RetTy,
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ArrayRef<Type*> Tys) const {
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return 1;
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}
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unsigned getNumberOfParts(Type *Tp) const {
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return 0;
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}
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};
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} // end anonymous namespace
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INITIALIZE_AG_PASS(NoTTI, TargetTransformInfo, "notti",
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"No target information", true, true, true)
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char NoTTI::ID = 0;
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ImmutablePass *llvm::createNoTargetTransformInfoPass() {
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return new NoTTI();
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}
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