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//==- HexagonTargetTransformInfo.cpp - Hexagon specific TTI pass -*- C++ -*-==//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
/// \file
/// This file implements a TargetTransformInfo analysis pass specific to the
/// Hexagon target machine. It uses the target's detailed information to provide
/// more precise answers to certain TTI queries, while letting the target
/// independent and default TTI implementations handle the rest.
#include "Hexagon.h"
#include "HexagonSubtarget.h"
#include "HexagonTargetMachine.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/BasicTTIImpl.h"
#include "llvm/IR/Function.h"
namespace llvm {
class Loop;
class ScalarEvolution;
class User;
class Value;
class HexagonTTIImpl : public BasicTTIImplBase<HexagonTTIImpl> {
using BaseT = BasicTTIImplBase<HexagonTTIImpl>;
using TTI = TargetTransformInfo;
friend BaseT;
const HexagonSubtarget &ST;
const HexagonTargetLowering &TLI;
const HexagonSubtarget *getST() const { return &ST; }
const HexagonTargetLowering *getTLI() const { return &TLI; }
bool useHVX() const;
bool isTypeForHVX(Type *VecTy) const;
// Returns the number of vector elements of Ty, if Ty is a vector type,
// or 1 if Ty is a scalar type. It is incorrect to call this function
// with any other type.
unsigned getTypeNumElements(Type *Ty) const;
explicit HexagonTTIImpl(const HexagonTargetMachine *TM, const Function &F)
: BaseT(TM, F.getParent()->getDataLayout()),
ST(*TM->getSubtargetImpl(F)), TLI(*ST.getTargetLowering()) {}
/// \name Scalar TTI Implementations
/// @{
TTI::PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const;
// The Hexagon target can unroll loops with run-time trip counts.
void getUnrollingPreferences(Loop *L, ScalarEvolution &SE,
TTI::UnrollingPreferences &UP);
/// Bias LSR towards creating post-increment opportunities.
bool shouldFavorPostInc() const;
// L1 cache prefetch.
unsigned getPrefetchDistance() const;
unsigned getCacheLineSize() const;
/// @}
/// \name Vector TTI Implementations
/// @{
unsigned getNumberOfRegisters(bool vector) const;
unsigned getMaxInterleaveFactor(unsigned VF);
unsigned getRegisterBitWidth(bool Vector) const;
unsigned getMinVectorRegisterBitWidth() const;
unsigned getMinimumVF(unsigned ElemWidth) const;
bool shouldMaximizeVectorBandwidth(bool OptSize) const {
return true;
bool supportsEfficientVectorElementLoadStore() {
return false;
bool hasBranchDivergence() {
return false;
bool enableAggressiveInterleaving(bool LoopHasReductions) {
return false;
bool prefersVectorizedAddressing() {
return false;
bool enableInterleavedAccessVectorization() {
return true;
unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract);
unsigned getOperandsScalarizationOverhead(ArrayRef<const Value*> Args,
unsigned VF);
unsigned getCallInstrCost(Function *F, Type *RetTy, ArrayRef<Type*> Tys);
unsigned getIntrinsicInstrCost(Intrinsic::ID ID, Type *RetTy,
ArrayRef<Value*> Args, FastMathFlags FMF, unsigned VF);
unsigned getIntrinsicInstrCost(Intrinsic::ID ID, Type *RetTy,
ArrayRef<Type*> Tys, FastMathFlags FMF,
unsigned ScalarizationCostPassed = UINT_MAX);
unsigned getAddressComputationCost(Type *Tp, ScalarEvolution *SE,
const SCEV *S);
unsigned getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
unsigned AddressSpace, const Instruction *I = nullptr);
unsigned getMaskedMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
unsigned AddressSpace);
unsigned getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index,
Type *SubTp);
unsigned getGatherScatterOpCost(unsigned Opcode, Type *DataTy, Value *Ptr,
bool VariableMask, unsigned Alignment);
unsigned getInterleavedMemoryOpCost(unsigned Opcode, Type *VecTy,
unsigned Factor, ArrayRef<unsigned> Indices, unsigned Alignment,
unsigned AddressSpace, bool UseMaskForCond = false,
bool UseMaskForGaps = false);
unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy,
const Instruction *I);
unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty,
TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue,
TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue,
TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None,
ArrayRef<const Value *> Args = ArrayRef<const Value *>());
unsigned getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src,
const Instruction *I = nullptr);
unsigned getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index);
unsigned getCFInstrCost(unsigned Opcode) {
return 1;
/// @}
int getUserCost(const User *U, ArrayRef<const Value *> Operands);
// Hexagon specific decision to generate a lookup table.
bool shouldBuildLookupTables() const;
} // end namespace llvm