1 //===-- LanaiTargetTransformInfo.h - Lanai specific TTI ---------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 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. 14 // 15 //===----------------------------------------------------------------------===// 16 17 #ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H 18 #define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H 19 20 #include "Lanai.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" 26 27 namespace llvm { 28 class LanaiTTIImpl : public BasicTTIImplBase<LanaiTTIImpl> { 29 typedef BasicTTIImplBase<LanaiTTIImpl> BaseT; 30 typedef TargetTransformInfo TTI; 31 friend BaseT; 32 33 const LanaiSubtarget *ST; 34 const LanaiTargetLowering *TLI; 35 36 const LanaiSubtarget *getST() const { return ST; } 37 const LanaiTargetLowering *getTLI() const { return TLI; } 38 39 public: 40 explicit LanaiTTIImpl(const LanaiTargetMachine *TM, const Function &F) 41 : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)), 42 TLI(ST->getTargetLowering()) {} 43 44 LanaiTTIImpl(const LanaiTTIImpl &Arg) 45 : BaseT(static_cast<const BaseT &>(Arg)), ST(Arg.ST), TLI(Arg.TLI) {} 46 LanaiTTIImpl(LanaiTTIImpl &&Arg) 47 : BaseT(std::move(static_cast<BaseT &>(Arg))), ST(std::move(Arg.ST)), 48 TLI(std::move(Arg.TLI)) {} 49 50 bool shouldBuildLookupTables() const { return false; } 51 52 TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) { 53 if (TyWidth == 32) 54 return TTI::PSK_FastHardware; 55 return TTI::PSK_Software; 56 } 57 58 unsigned getArithmeticInstrCost( 59 unsigned Opcode, Type *Ty, 60 TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue, 61 TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue, 62 TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None, 63 TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None) { 64 int ISD = TLI->InstructionOpcodeToISD(Opcode); 65 66 switch (ISD) { 67 default: 68 return BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info, 69 Opd1PropInfo, Opd2PropInfo); 70 case ISD::MUL: 71 case ISD::SDIV: 72 case ISD::UDIV: 73 case ISD::UREM: 74 // This increases the cost associated with multiplication and division 75 // to 64 times what the baseline arithmetic cost is. The arithmetic 76 // instruction cost was arbitrarily chosen to reduce the desirability 77 // of emitting arithmetic instructions that are emulated in software. 78 // TODO: Investigate the performance impact given specialized lowerings. 79 return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info, 80 Opd1PropInfo, Opd2PropInfo); 81 } 82 } 83 }; 84 85 } // end namespace llvm 86 87 #endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H 88
