forked from OSchip/llvm-project
83 lines
3.1 KiB
C++
83 lines
3.1 KiB
C++
//===-- LanaiTargetTransformInfo.h - Lanai specific TTI ---------*- 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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//
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// This file a TargetTransformInfo::Concept conforming object specific to the
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// Lanai target machine. It uses the target's detailed information to
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// provide more precise answers to certain TTI queries, while letting the
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// target independent and default TTI implementations handle the rest.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
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#define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
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#include "Lanai.h"
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#include "LanaiSubtarget.h"
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#include "LanaiTargetMachine.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/CodeGen/BasicTTIImpl.h"
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#include "llvm/Target/TargetLowering.h"
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namespace llvm {
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class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> {
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typedef BasicTTIImplBase<LanaiTTIImpl> BaseT;
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typedef TargetTransformInfo TTI;
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friend BaseT;
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const LanaiSubtarget *ST;
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const LanaiTargetLowering *TLI;
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const LanaiSubtarget *getST() const { return ST; }
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const LanaiTargetLowering *getTLI() const { return TLI; }
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public:
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explicit LanaiTTIImpl(const LanaiTargetMachine *TM, const Function &F)
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: BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
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TLI(ST->getTargetLowering()) {}
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bool shouldBuildLookupTables() const { return false; }
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TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) {
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if (TyWidth == 32)
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return TTI::PSK_FastHardware;
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return TTI::PSK_Software;
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}
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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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ArrayRef<const Value *> Args = ArrayRef<const Value *>()) {
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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switch (ISD) {
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default:
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return BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
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Opd1PropInfo, Opd2PropInfo);
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case ISD::MUL:
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case ISD::SDIV:
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case ISD::UDIV:
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case ISD::UREM:
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// This increases the cost associated with multiplication and division
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// to 64 times what the baseline arithmetic cost is. The arithmetic
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// instruction cost was arbitrarily chosen to reduce the desirability
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// of emitting arithmetic instructions that are emulated in software.
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// TODO: Investigate the performance impact given specialized lowerings.
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return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
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Opd1PropInfo, Opd2PropInfo);
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}
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}
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
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