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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232584 91177308-0d34-0410-b5e6-96231b3b80d8
766 lines
26 KiB
C++
766 lines
26 KiB
C++
//===- BasicTTIImpl.h -------------------------------------------*- C++ -*-===//
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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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/// \file
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/// This file provides a helper that implements much of the TTI interface in
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/// terms of the target-independent code generator and TargetLowering
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/// interfaces.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_BASICTTIIMPL_H
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#define LLVM_CODEGEN_BASICTTIIMPL_H
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/TargetTransformInfoImpl.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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namespace llvm {
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extern cl::opt<unsigned> PartialUnrollingThreshold;
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/// \brief Base class which can be used to help build a TTI implementation.
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///
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/// This class provides as much implementation of the TTI interface as is
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/// possible using the target independent parts of the code generator.
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///
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/// In order to subclass it, your class must implement a getST() method to
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/// return the subtarget, and a getTLI() method to return the target lowering.
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/// We need these methods implemented in the derived class so that this class
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/// doesn't have to duplicate storage for them.
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template <typename T>
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class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
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private:
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typedef TargetTransformInfoImplCRTPBase<T> BaseT;
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typedef TargetTransformInfo TTI;
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/// Estimate the overhead of scalarizing an instruction. Insert and Extract
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/// are set if the result needs to be inserted and/or extracted from vectors.
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unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) {
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assert(Ty->isVectorTy() && "Can only scalarize vectors");
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unsigned Cost = 0;
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for (int i = 0, e = Ty->getVectorNumElements(); i < e; ++i) {
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if (Insert)
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Cost += static_cast<T *>(this)
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->getVectorInstrCost(Instruction::InsertElement, Ty, i);
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if (Extract)
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Cost += static_cast<T *>(this)
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->getVectorInstrCost(Instruction::ExtractElement, Ty, i);
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}
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return Cost;
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}
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/// Estimate the cost overhead of SK_Alternate shuffle.
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unsigned getAltShuffleOverhead(Type *Ty) {
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assert(Ty->isVectorTy() && "Can only shuffle vectors");
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unsigned Cost = 0;
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// Shuffle cost is equal to the cost of extracting element from its argument
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// plus the cost of inserting them onto the result vector.
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// e.g. <4 x float> has a mask of <0,5,2,7> i.e we need to extract from
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// index 0 of first vector, index 1 of second vector,index 2 of first
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// vector and finally index 3 of second vector and insert them at index
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// <0,1,2,3> of result vector.
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for (int i = 0, e = Ty->getVectorNumElements(); i < e; ++i) {
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Cost += static_cast<T *>(this)
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->getVectorInstrCost(Instruction::InsertElement, Ty, i);
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Cost += static_cast<T *>(this)
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->getVectorInstrCost(Instruction::ExtractElement, Ty, i);
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}
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return Cost;
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}
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/// \brief Local query method delegates up to T which *must* implement this!
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const TargetSubtargetInfo *getST() const {
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return static_cast<const T *>(this)->getST();
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}
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/// \brief Local query method delegates up to T which *must* implement this!
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const TargetLoweringBase *getTLI() const {
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return static_cast<const T *>(this)->getTLI();
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}
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protected:
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explicit BasicTTIImplBase(const TargetMachine *TM)
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: BaseT(TM->getDataLayout()) {}
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public:
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// Provide value semantics. MSVC requires that we spell all of these out.
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BasicTTIImplBase(const BasicTTIImplBase &Arg)
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: BaseT(static_cast<const BaseT &>(Arg)) {}
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BasicTTIImplBase(BasicTTIImplBase &&Arg)
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: BaseT(std::move(static_cast<BaseT &>(Arg))) {}
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BasicTTIImplBase &operator=(const BasicTTIImplBase &RHS) {
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BaseT::operator=(static_cast<const BaseT &>(RHS));
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return *this;
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}
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BasicTTIImplBase &operator=(BasicTTIImplBase &&RHS) {
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BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
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return *this;
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}
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/// \name Scalar TTI Implementations
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/// @{
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bool hasBranchDivergence() { return false; }
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bool isLegalAddImmediate(int64_t imm) {
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return getTLI()->isLegalAddImmediate(imm);
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}
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bool isLegalICmpImmediate(int64_t imm) {
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return getTLI()->isLegalICmpImmediate(imm);
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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) {
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TargetLoweringBase::AddrMode AM;
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AM.BaseGV = BaseGV;
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AM.BaseOffs = BaseOffset;
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AM.HasBaseReg = HasBaseReg;
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AM.Scale = Scale;
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return getTLI()->isLegalAddressingMode(AM, Ty);
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}
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int getScalingFactorCost(Type *Ty, GlobalValue *BaseGV, int64_t BaseOffset,
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bool HasBaseReg, int64_t Scale) {
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TargetLoweringBase::AddrMode AM;
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AM.BaseGV = BaseGV;
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AM.BaseOffs = BaseOffset;
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AM.HasBaseReg = HasBaseReg;
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AM.Scale = Scale;
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return getTLI()->getScalingFactorCost(AM, Ty);
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}
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bool isTruncateFree(Type *Ty1, Type *Ty2) {
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return getTLI()->isTruncateFree(Ty1, Ty2);
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}
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bool isProfitableToHoist(Instruction *I) {
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return getTLI()->isProfitableToHoist(I);
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}
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bool isTypeLegal(Type *Ty) {
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EVT VT = getTLI()->getValueType(Ty);
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return getTLI()->isTypeLegal(VT);
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}
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unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
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ArrayRef<const Value *> Arguments) {
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return BaseT::getIntrinsicCost(IID, RetTy, Arguments);
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}
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unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
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ArrayRef<Type *> ParamTys) {
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if (IID == Intrinsic::cttz) {
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if (getTLI()->isCheapToSpeculateCttz())
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return TargetTransformInfo::TCC_Basic;
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return TargetTransformInfo::TCC_Expensive;
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}
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if (IID == Intrinsic::ctlz) {
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if (getTLI()->isCheapToSpeculateCtlz())
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return TargetTransformInfo::TCC_Basic;
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return TargetTransformInfo::TCC_Expensive;
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}
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return BaseT::getIntrinsicCost(IID, RetTy, ParamTys);
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}
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unsigned getJumpBufAlignment() { return getTLI()->getJumpBufAlignment(); }
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unsigned getJumpBufSize() { return getTLI()->getJumpBufSize(); }
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bool shouldBuildLookupTables() {
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const TargetLoweringBase *TLI = getTLI();
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return TLI->isOperationLegalOrCustom(ISD::BR_JT, MVT::Other) ||
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TLI->isOperationLegalOrCustom(ISD::BRIND, MVT::Other);
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}
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bool haveFastSqrt(Type *Ty) {
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const TargetLoweringBase *TLI = getTLI();
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EVT VT = TLI->getValueType(Ty);
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return TLI->isTypeLegal(VT) &&
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TLI->isOperationLegalOrCustom(ISD::FSQRT, VT);
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}
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unsigned getFPOpCost(Type *Ty) {
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// By default, FP instructions are no more expensive since they are
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// implemented in HW. Target specific TTI can override this.
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return TargetTransformInfo::TCC_Basic;
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}
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unsigned getOperationCost(unsigned Opcode, Type *Ty, Type *OpTy) {
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const TargetLoweringBase *TLI = getTLI();
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switch (Opcode) {
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default: break;
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case Instruction::Trunc: {
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if (TLI->isTruncateFree(OpTy, Ty))
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return TargetTransformInfo::TCC_Free;
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return TargetTransformInfo::TCC_Basic;
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}
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case Instruction::ZExt: {
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if (TLI->isZExtFree(OpTy, Ty))
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return TargetTransformInfo::TCC_Free;
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return TargetTransformInfo::TCC_Basic;
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}
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}
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return BaseT::getOperationCost(Opcode, Ty, OpTy);
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}
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void getUnrollingPreferences(Loop *L, TTI::UnrollingPreferences &UP) {
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// This unrolling functionality is target independent, but to provide some
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// motivation for its intended use, for x86:
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// According to the Intel 64 and IA-32 Architectures Optimization Reference
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// Manual, Intel Core models and later have a loop stream detector (and
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// associated uop queue) that can benefit from partial unrolling.
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// The relevant requirements are:
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// - The loop must have no more than 4 (8 for Nehalem and later) branches
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// taken, and none of them may be calls.
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// - The loop can have no more than 18 (28 for Nehalem and later) uops.
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// According to the Software Optimization Guide for AMD Family 15h
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// Processors, models 30h-4fh (Steamroller and later) have a loop predictor
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// and loop buffer which can benefit from partial unrolling.
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// The relevant requirements are:
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// - The loop must have fewer than 16 branches
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// - The loop must have less than 40 uops in all executed loop branches
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// The number of taken branches in a loop is hard to estimate here, and
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// benchmarking has revealed that it is better not to be conservative when
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// estimating the branch count. As a result, we'll ignore the branch limits
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// until someone finds a case where it matters in practice.
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unsigned MaxOps;
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const TargetSubtargetInfo *ST = getST();
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if (PartialUnrollingThreshold.getNumOccurrences() > 0)
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MaxOps = PartialUnrollingThreshold;
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else if (ST->getSchedModel().LoopMicroOpBufferSize > 0)
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MaxOps = ST->getSchedModel().LoopMicroOpBufferSize;
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else
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return;
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// Scan the loop: don't unroll loops with calls.
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for (Loop::block_iterator I = L->block_begin(), E = L->block_end(); I != E;
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++I) {
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BasicBlock *BB = *I;
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for (BasicBlock::iterator J = BB->begin(), JE = BB->end(); J != JE; ++J)
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if (isa<CallInst>(J) || isa<InvokeInst>(J)) {
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ImmutableCallSite CS(J);
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if (const Function *F = CS.getCalledFunction()) {
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if (!static_cast<T *>(this)->isLoweredToCall(F))
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continue;
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}
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return;
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}
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}
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// Enable runtime and partial unrolling up to the specified size.
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UP.Partial = UP.Runtime = true;
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UP.PartialThreshold = UP.PartialOptSizeThreshold = MaxOps;
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}
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/// @}
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/// \name Vector TTI Implementations
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/// @{
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unsigned getNumberOfRegisters(bool Vector) { return 1; }
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unsigned getRegisterBitWidth(bool Vector) { return 32; }
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unsigned getMaxInterleaveFactor() { return 1; }
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unsigned getArithmeticInstrCost(
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unsigned Opcode, Type *Ty,
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TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue,
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TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue,
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TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
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TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None) {
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// Check if any of the operands are vector operands.
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const TargetLoweringBase *TLI = getTLI();
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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assert(ISD && "Invalid opcode");
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std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Ty);
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bool IsFloat = Ty->getScalarType()->isFloatingPointTy();
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// Assume that floating point arithmetic operations cost twice as much as
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// integer operations.
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unsigned OpCost = (IsFloat ? 2 : 1);
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if (TLI->isOperationLegalOrPromote(ISD, LT.second)) {
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// The operation is legal. Assume it costs 1.
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// If the type is split to multiple registers, assume that there is some
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// overhead to this.
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// TODO: Once we have extract/insert subvector cost we need to use them.
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if (LT.first > 1)
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return LT.first * 2 * OpCost;
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return LT.first * 1 * OpCost;
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}
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if (!TLI->isOperationExpand(ISD, LT.second)) {
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// If the operation is custom lowered then assume
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// thare the code is twice as expensive.
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return LT.first * 2 * OpCost;
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}
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// Else, assume that we need to scalarize this op.
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if (Ty->isVectorTy()) {
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unsigned Num = Ty->getVectorNumElements();
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unsigned Cost = static_cast<T *>(this)
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->getArithmeticInstrCost(Opcode, Ty->getScalarType());
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// return the cost of multiple scalar invocation plus the cost of
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// inserting
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// and extracting the values.
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return getScalarizationOverhead(Ty, true, true) + Num * Cost;
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}
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// We don't know anything about this scalar instruction.
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return OpCost;
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}
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unsigned getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index,
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Type *SubTp) {
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if (Kind == TTI::SK_Alternate) {
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return getAltShuffleOverhead(Tp);
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}
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return 1;
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}
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unsigned getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) {
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const TargetLoweringBase *TLI = getTLI();
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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assert(ISD && "Invalid opcode");
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std::pair<unsigned, MVT> SrcLT = TLI->getTypeLegalizationCost(Src);
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std::pair<unsigned, MVT> DstLT = TLI->getTypeLegalizationCost(Dst);
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// Check for NOOP conversions.
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if (SrcLT.first == DstLT.first &&
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SrcLT.second.getSizeInBits() == DstLT.second.getSizeInBits()) {
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// Bitcast between types that are legalized to the same type are free.
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if (Opcode == Instruction::BitCast || Opcode == Instruction::Trunc)
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return 0;
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}
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if (Opcode == Instruction::Trunc &&
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TLI->isTruncateFree(SrcLT.second, DstLT.second))
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return 0;
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if (Opcode == Instruction::ZExt &&
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TLI->isZExtFree(SrcLT.second, DstLT.second))
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return 0;
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// If the cast is marked as legal (or promote) then assume low cost.
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if (SrcLT.first == DstLT.first &&
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TLI->isOperationLegalOrPromote(ISD, DstLT.second))
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return 1;
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// Handle scalar conversions.
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if (!Src->isVectorTy() && !Dst->isVectorTy()) {
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// Scalar bitcasts are usually free.
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if (Opcode == Instruction::BitCast)
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return 0;
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// Just check the op cost. If the operation is legal then assume it costs
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// 1.
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if (!TLI->isOperationExpand(ISD, DstLT.second))
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return 1;
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// Assume that illegal scalar instruction are expensive.
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return 4;
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}
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// Check vector-to-vector casts.
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if (Dst->isVectorTy() && Src->isVectorTy()) {
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// If the cast is between same-sized registers, then the check is simple.
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if (SrcLT.first == DstLT.first &&
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SrcLT.second.getSizeInBits() == DstLT.second.getSizeInBits()) {
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// Assume that Zext is done using AND.
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if (Opcode == Instruction::ZExt)
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return 1;
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// Assume that sext is done using SHL and SRA.
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if (Opcode == Instruction::SExt)
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return 2;
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// Just check the op cost. If the operation is legal then assume it
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// costs
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// 1 and multiply by the type-legalization overhead.
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if (!TLI->isOperationExpand(ISD, DstLT.second))
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return SrcLT.first * 1;
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}
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// If we are converting vectors and the operation is illegal, or
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// if the vectors are legalized to different types, estimate the
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// scalarization costs.
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unsigned Num = Dst->getVectorNumElements();
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unsigned Cost = static_cast<T *>(this)->getCastInstrCost(
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Opcode, Dst->getScalarType(), Src->getScalarType());
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// Return the cost of multiple scalar invocation plus the cost of
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// inserting and extracting the values.
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return getScalarizationOverhead(Dst, true, true) + Num * Cost;
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}
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// We already handled vector-to-vector and scalar-to-scalar conversions.
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// This
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// is where we handle bitcast between vectors and scalars. We need to assume
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// that the conversion is scalarized in one way or another.
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if (Opcode == Instruction::BitCast)
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// Illegal bitcasts are done by storing and loading from a stack slot.
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return (Src->isVectorTy() ? getScalarizationOverhead(Src, false, true)
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: 0) +
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(Dst->isVectorTy() ? getScalarizationOverhead(Dst, true, false)
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: 0);
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llvm_unreachable("Unhandled cast");
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}
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unsigned getCFInstrCost(unsigned Opcode) {
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// Branches are assumed to be predicted.
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return 0;
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}
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unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy) {
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const TargetLoweringBase *TLI = getTLI();
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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assert(ISD && "Invalid opcode");
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// Selects on vectors are actually vector selects.
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if (ISD == ISD::SELECT) {
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assert(CondTy && "CondTy must exist");
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if (CondTy->isVectorTy())
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ISD = ISD::VSELECT;
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}
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std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(ValTy);
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if (!(ValTy->isVectorTy() && !LT.second.isVector()) &&
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!TLI->isOperationExpand(ISD, LT.second)) {
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// The operation is legal. Assume it costs 1. Multiply
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// by the type-legalization overhead.
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return LT.first * 1;
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}
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// Otherwise, assume that the cast is scalarized.
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if (ValTy->isVectorTy()) {
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unsigned Num = ValTy->getVectorNumElements();
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if (CondTy)
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CondTy = CondTy->getScalarType();
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unsigned Cost = static_cast<T *>(this)->getCmpSelInstrCost(
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Opcode, ValTy->getScalarType(), CondTy);
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// Return the cost of multiple scalar invocation plus the cost of
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// inserting
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// and extracting the values.
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return getScalarizationOverhead(ValTy, true, false) + Num * Cost;
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}
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// Unknown scalar opcode.
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return 1;
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}
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unsigned getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index) {
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std::pair<unsigned, MVT> LT =
|
|
getTLI()->getTypeLegalizationCost(Val->getScalarType());
|
|
|
|
return LT.first;
|
|
}
|
|
|
|
unsigned getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
|
|
unsigned AddressSpace) {
|
|
assert(!Src->isVoidTy() && "Invalid type");
|
|
std::pair<unsigned, MVT> LT = getTLI()->getTypeLegalizationCost(Src);
|
|
|
|
// Assuming that all loads of legal types cost 1.
|
|
unsigned Cost = LT.first;
|
|
|
|
if (Src->isVectorTy() &&
|
|
Src->getPrimitiveSizeInBits() < LT.second.getSizeInBits()) {
|
|
// This is a vector load that legalizes to a larger type than the vector
|
|
// itself. Unless the corresponding extending load or truncating store is
|
|
// legal, then this will scalarize.
|
|
TargetLowering::LegalizeAction LA = TargetLowering::Expand;
|
|
EVT MemVT = getTLI()->getValueType(Src, true);
|
|
if (MemVT.isSimple() && MemVT != MVT::Other) {
|
|
if (Opcode == Instruction::Store)
|
|
LA = getTLI()->getTruncStoreAction(LT.second, MemVT.getSimpleVT());
|
|
else
|
|
LA = getTLI()->getLoadExtAction(ISD::EXTLOAD, LT.second, MemVT);
|
|
}
|
|
|
|
if (LA != TargetLowering::Legal && LA != TargetLowering::Custom) {
|
|
// This is a vector load/store for some illegal type that is scalarized.
|
|
// We must account for the cost of building or decomposing the vector.
|
|
Cost += getScalarizationOverhead(Src, Opcode != Instruction::Store,
|
|
Opcode == Instruction::Store);
|
|
}
|
|
}
|
|
|
|
return Cost;
|
|
}
|
|
|
|
unsigned getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy,
|
|
ArrayRef<Type *> Tys) {
|
|
unsigned ISD = 0;
|
|
switch (IID) {
|
|
default: {
|
|
// Assume that we need to scalarize this intrinsic.
|
|
unsigned ScalarizationCost = 0;
|
|
unsigned ScalarCalls = 1;
|
|
Type *ScalarRetTy = RetTy;
|
|
if (RetTy->isVectorTy()) {
|
|
ScalarizationCost = getScalarizationOverhead(RetTy, true, false);
|
|
ScalarCalls = std::max(ScalarCalls, RetTy->getVectorNumElements());
|
|
ScalarRetTy = RetTy->getScalarType();
|
|
}
|
|
SmallVector<Type *, 4> ScalarTys;
|
|
for (unsigned i = 0, ie = Tys.size(); i != ie; ++i) {
|
|
Type *Ty = Tys[i];
|
|
if (Ty->isVectorTy()) {
|
|
ScalarizationCost += getScalarizationOverhead(Ty, false, true);
|
|
ScalarCalls = std::max(ScalarCalls, Ty->getVectorNumElements());
|
|
Ty = Ty->getScalarType();
|
|
}
|
|
ScalarTys.push_back(Ty);
|
|
}
|
|
if (ScalarCalls == 1)
|
|
return 1; // Return cost of a scalar intrinsic. Assume it to be cheap.
|
|
|
|
unsigned ScalarCost = static_cast<T *>(this)->getIntrinsicInstrCost(
|
|
IID, ScalarRetTy, ScalarTys);
|
|
|
|
return ScalarCalls * ScalarCost + ScalarizationCost;
|
|
}
|
|
// Look for intrinsics that can be lowered directly or turned into a scalar
|
|
// intrinsic call.
|
|
case Intrinsic::sqrt:
|
|
ISD = ISD::FSQRT;
|
|
break;
|
|
case Intrinsic::sin:
|
|
ISD = ISD::FSIN;
|
|
break;
|
|
case Intrinsic::cos:
|
|
ISD = ISD::FCOS;
|
|
break;
|
|
case Intrinsic::exp:
|
|
ISD = ISD::FEXP;
|
|
break;
|
|
case Intrinsic::exp2:
|
|
ISD = ISD::FEXP2;
|
|
break;
|
|
case Intrinsic::log:
|
|
ISD = ISD::FLOG;
|
|
break;
|
|
case Intrinsic::log10:
|
|
ISD = ISD::FLOG10;
|
|
break;
|
|
case Intrinsic::log2:
|
|
ISD = ISD::FLOG2;
|
|
break;
|
|
case Intrinsic::fabs:
|
|
ISD = ISD::FABS;
|
|
break;
|
|
case Intrinsic::minnum:
|
|
ISD = ISD::FMINNUM;
|
|
break;
|
|
case Intrinsic::maxnum:
|
|
ISD = ISD::FMAXNUM;
|
|
break;
|
|
case Intrinsic::copysign:
|
|
ISD = ISD::FCOPYSIGN;
|
|
break;
|
|
case Intrinsic::floor:
|
|
ISD = ISD::FFLOOR;
|
|
break;
|
|
case Intrinsic::ceil:
|
|
ISD = ISD::FCEIL;
|
|
break;
|
|
case Intrinsic::trunc:
|
|
ISD = ISD::FTRUNC;
|
|
break;
|
|
case Intrinsic::nearbyint:
|
|
ISD = ISD::FNEARBYINT;
|
|
break;
|
|
case Intrinsic::rint:
|
|
ISD = ISD::FRINT;
|
|
break;
|
|
case Intrinsic::round:
|
|
ISD = ISD::FROUND;
|
|
break;
|
|
case Intrinsic::pow:
|
|
ISD = ISD::FPOW;
|
|
break;
|
|
case Intrinsic::fma:
|
|
ISD = ISD::FMA;
|
|
break;
|
|
case Intrinsic::fmuladd:
|
|
ISD = ISD::FMA;
|
|
break;
|
|
// FIXME: We should return 0 whenever getIntrinsicCost == TCC_Free.
|
|
case Intrinsic::lifetime_start:
|
|
case Intrinsic::lifetime_end:
|
|
return 0;
|
|
case Intrinsic::masked_store:
|
|
return static_cast<T *>(this)
|
|
->getMaskedMemoryOpCost(Instruction::Store, Tys[0], 0, 0);
|
|
case Intrinsic::masked_load:
|
|
return static_cast<T *>(this)
|
|
->getMaskedMemoryOpCost(Instruction::Load, RetTy, 0, 0);
|
|
}
|
|
|
|
const TargetLoweringBase *TLI = getTLI();
|
|
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(RetTy);
|
|
|
|
if (TLI->isOperationLegalOrPromote(ISD, LT.second)) {
|
|
// The operation is legal. Assume it costs 1.
|
|
// If the type is split to multiple registers, assume that there is some
|
|
// overhead to this.
|
|
// TODO: Once we have extract/insert subvector cost we need to use them.
|
|
if (LT.first > 1)
|
|
return LT.first * 2;
|
|
return LT.first * 1;
|
|
}
|
|
|
|
if (!TLI->isOperationExpand(ISD, LT.second)) {
|
|
// If the operation is custom lowered then assume
|
|
// thare the code is twice as expensive.
|
|
return LT.first * 2;
|
|
}
|
|
|
|
// If we can't lower fmuladd into an FMA estimate the cost as a floating
|
|
// point mul followed by an add.
|
|
if (IID == Intrinsic::fmuladd)
|
|
return static_cast<T *>(this)
|
|
->getArithmeticInstrCost(BinaryOperator::FMul, RetTy) +
|
|
static_cast<T *>(this)
|
|
->getArithmeticInstrCost(BinaryOperator::FAdd, RetTy);
|
|
|
|
// Else, assume that we need to scalarize this intrinsic. For math builtins
|
|
// this will emit a costly libcall, adding call overhead and spills. Make it
|
|
// very expensive.
|
|
if (RetTy->isVectorTy()) {
|
|
unsigned ScalarizationCost = getScalarizationOverhead(RetTy, true, false);
|
|
unsigned ScalarCalls = RetTy->getVectorNumElements();
|
|
SmallVector<Type *, 4> ScalarTys;
|
|
for (unsigned i = 0, ie = Tys.size(); i != ie; ++i) {
|
|
Type *Ty = Tys[i];
|
|
if (Ty->isVectorTy())
|
|
Ty = Ty->getScalarType();
|
|
ScalarTys.push_back(Ty);
|
|
}
|
|
unsigned ScalarCost = static_cast<T *>(this)->getIntrinsicInstrCost(
|
|
IID, RetTy->getScalarType(), ScalarTys);
|
|
for (unsigned i = 0, ie = Tys.size(); i != ie; ++i) {
|
|
if (Tys[i]->isVectorTy()) {
|
|
ScalarizationCost += getScalarizationOverhead(Tys[i], false, true);
|
|
ScalarCalls = std::max(ScalarCalls, Tys[i]->getVectorNumElements());
|
|
}
|
|
}
|
|
|
|
return ScalarCalls * ScalarCost + ScalarizationCost;
|
|
}
|
|
|
|
// This is going to be turned into a library call, make it expensive.
|
|
return 10;
|
|
}
|
|
|
|
/// \brief Compute a cost of the given call instruction.
|
|
///
|
|
/// Compute the cost of calling function F with return type RetTy and
|
|
/// argument types Tys. F might be nullptr, in this case the cost of an
|
|
/// arbitrary call with the specified signature will be returned.
|
|
/// This is used, for instance, when we estimate call of a vector
|
|
/// counterpart of the given function.
|
|
/// \param F Called function, might be nullptr.
|
|
/// \param RetTy Return value types.
|
|
/// \param Tys Argument types.
|
|
/// \returns The cost of Call instruction.
|
|
unsigned getCallInstrCost(Function *F, Type *RetTy, ArrayRef<Type *> Tys) {
|
|
return 10;
|
|
}
|
|
|
|
unsigned getNumberOfParts(Type *Tp) {
|
|
std::pair<unsigned, MVT> LT = getTLI()->getTypeLegalizationCost(Tp);
|
|
return LT.first;
|
|
}
|
|
|
|
unsigned getAddressComputationCost(Type *Ty, bool IsComplex) { return 0; }
|
|
|
|
unsigned getReductionCost(unsigned Opcode, Type *Ty, bool IsPairwise) {
|
|
assert(Ty->isVectorTy() && "Expect a vector type");
|
|
unsigned NumVecElts = Ty->getVectorNumElements();
|
|
unsigned NumReduxLevels = Log2_32(NumVecElts);
|
|
unsigned ArithCost =
|
|
NumReduxLevels *
|
|
static_cast<T *>(this)->getArithmeticInstrCost(Opcode, Ty);
|
|
// Assume the pairwise shuffles add a cost.
|
|
unsigned ShuffleCost =
|
|
NumReduxLevels * (IsPairwise + 1) *
|
|
static_cast<T *>(this)
|
|
->getShuffleCost(TTI::SK_ExtractSubvector, Ty, NumVecElts / 2, Ty);
|
|
return ShuffleCost + ArithCost + getScalarizationOverhead(Ty, false, true);
|
|
}
|
|
|
|
/// @}
|
|
};
|
|
|
|
/// \brief Concrete BasicTTIImpl that can be used if no further customization
|
|
/// is needed.
|
|
class BasicTTIImpl : public BasicTTIImplBase<BasicTTIImpl> {
|
|
typedef BasicTTIImplBase<BasicTTIImpl> BaseT;
|
|
friend class BasicTTIImplBase<BasicTTIImpl>;
|
|
|
|
const TargetSubtargetInfo *ST;
|
|
const TargetLoweringBase *TLI;
|
|
|
|
const TargetSubtargetInfo *getST() const { return ST; }
|
|
const TargetLoweringBase *getTLI() const { return TLI; }
|
|
|
|
public:
|
|
explicit BasicTTIImpl(const TargetMachine *ST, Function &F);
|
|
|
|
// Provide value semantics. MSVC requires that we spell all of these out.
|
|
BasicTTIImpl(const BasicTTIImpl &Arg)
|
|
: BaseT(static_cast<const BaseT &>(Arg)), ST(Arg.ST), TLI(Arg.TLI) {}
|
|
BasicTTIImpl(BasicTTIImpl &&Arg)
|
|
: BaseT(std::move(static_cast<BaseT &>(Arg))), ST(std::move(Arg.ST)),
|
|
TLI(std::move(Arg.TLI)) {}
|
|
BasicTTIImpl &operator=(const BasicTTIImpl &RHS) {
|
|
BaseT::operator=(static_cast<const BaseT &>(RHS));
|
|
ST = RHS.ST;
|
|
TLI = RHS.TLI;
|
|
return *this;
|
|
}
|
|
BasicTTIImpl &operator=(BasicTTIImpl &&RHS) {
|
|
BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
|
|
ST = std::move(RHS.ST);
|
|
TLI = std::move(RHS.TLI);
|
|
return *this;
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|