forked from OSchip/llvm-project
109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
//===-- LanaiTargetTransformInfo.h - Lanai specific TTI ---------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file a TargetTransformInfo::Concept conforming object specific to the
|
|
// Lanai 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.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
|
|
#define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
|
|
|
|
#include "Lanai.h"
|
|
#include "LanaiSubtarget.h"
|
|
#include "LanaiTargetMachine.h"
|
|
#include "llvm/Analysis/TargetTransformInfo.h"
|
|
#include "llvm/CodeGen/BasicTTIImpl.h"
|
|
#include "llvm/CodeGen/TargetLowering.h"
|
|
#include "llvm/Support/MathExtras.h"
|
|
|
|
namespace llvm {
|
|
class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> {
|
|
typedef BasicTTIImplBase<LanaiTTIImpl> BaseT;
|
|
typedef TargetTransformInfo TTI;
|
|
friend BaseT;
|
|
|
|
const LanaiSubtarget *ST;
|
|
const LanaiTargetLowering *TLI;
|
|
|
|
const LanaiSubtarget *getST() const { return ST; }
|
|
const LanaiTargetLowering *getTLI() const { return TLI; }
|
|
|
|
public:
|
|
explicit LanaiTTIImpl(const LanaiTargetMachine *TM, const Function &F)
|
|
: BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
|
|
TLI(ST->getTargetLowering()) {}
|
|
|
|
bool shouldBuildLookupTables() const { return false; }
|
|
|
|
TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) {
|
|
if (TyWidth == 32)
|
|
return TTI::PSK_FastHardware;
|
|
return TTI::PSK_Software;
|
|
}
|
|
|
|
int getIntImmCost(const APInt &Imm, Type *Ty) {
|
|
assert(Ty->isIntegerTy());
|
|
if (Imm == 0)
|
|
return TTI::TCC_Free;
|
|
if (isInt<16>(Imm.getSExtValue()))
|
|
return TTI::TCC_Basic;
|
|
if (isInt<21>(Imm.getZExtValue()))
|
|
return TTI::TCC_Basic;
|
|
if (isInt<32>(Imm.getSExtValue())) {
|
|
if ((Imm.getSExtValue() & 0xFFFF) == 0)
|
|
return TTI::TCC_Basic;
|
|
return 2 * TTI::TCC_Basic;
|
|
}
|
|
|
|
return 4 * TTI::TCC_Basic;
|
|
}
|
|
|
|
int getIntImmCost(unsigned Opc, unsigned Idx, const APInt &Imm, Type *Ty) {
|
|
return getIntImmCost(Imm, Ty);
|
|
}
|
|
|
|
int getIntImmCost(Intrinsic::ID IID, unsigned Idx, const APInt &Imm,
|
|
Type *Ty) {
|
|
return getIntImmCost(Imm, Ty);
|
|
}
|
|
|
|
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 *>()) {
|
|
int ISD = TLI->InstructionOpcodeToISD(Opcode);
|
|
|
|
switch (ISD) {
|
|
default:
|
|
return BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
|
|
Opd1PropInfo, Opd2PropInfo);
|
|
case ISD::MUL:
|
|
case ISD::SDIV:
|
|
case ISD::UDIV:
|
|
case ISD::UREM:
|
|
// This increases the cost associated with multiplication and division
|
|
// to 64 times what the baseline arithmetic cost is. The arithmetic
|
|
// instruction cost was arbitrarily chosen to reduce the desirability
|
|
// of emitting arithmetic instructions that are emulated in software.
|
|
// TODO: Investigate the performance impact given specialized lowerings.
|
|
return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
|
|
Opd1PropInfo, Opd2PropInfo);
|
|
}
|
|
}
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
|