1 //===-- LanaiTargetTransformInfo.h - Lanai specific TTI ---------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file a TargetTransformInfo::Concept conforming object specific to the
11 // Lanai target machine. It uses the target's detailed information to
12 // provide more precise answers to certain TTI queries, while letting the
13 // target independent and default TTI implementations handle the rest.
15 //===----------------------------------------------------------------------===//
17 #ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
18 #define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H
21 #include "LanaiSubtarget.h"
22 #include "LanaiTargetMachine.h"
23 #include "llvm/Analysis/TargetTransformInfo.h"
24 #include "llvm/CodeGen/BasicTTIImpl.h"
25 #include "llvm/Target/TargetLowering.h"
28 class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> {
29 typedef BasicTTIImplBase<LanaiTTIImpl> BaseT;
30 typedef TargetTransformInfo TTI;
33 const LanaiSubtarget *ST;
34 const LanaiTargetLowering *TLI;
36 const LanaiSubtarget *getST() const { return ST; }
37 const LanaiTargetLowering *getTLI() const { return TLI; }
40 explicit LanaiTTIImpl(const LanaiTargetMachine *TM, const Function &F)
41 : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
42 TLI(ST->getTargetLowering()) {}
44 bool shouldBuildLookupTables() const { return false; }
46 TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) {
48 return TTI::PSK_FastHardware;
49 return TTI::PSK_Software;
52 unsigned getArithmeticInstrCost(
53 unsigned Opcode, Type *Ty,
54 TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue,
55 TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue,
56 TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
57 TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None) {
58 int ISD = TLI->InstructionOpcodeToISD(Opcode);
62 return BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
63 Opd1PropInfo, Opd2PropInfo);
68 // This increases the cost associated with multiplication and division
69 // to 64 times what the baseline arithmetic cost is. The arithmetic
70 // instruction cost was arbitrarily chosen to reduce the desirability
71 // of emitting arithmetic instructions that are emulated in software.
72 // TODO: Investigate the performance impact given specialized lowerings.
73 return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
74 Opd1PropInfo, Opd2PropInfo);
79 } // end namespace llvm
81 #endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H