1 //===-- LanaiTargetTransformInfo.h - Lanai specific TTI ---------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file a TargetTransformInfo::Concept conforming object specific to the 10 // Lanai target machine. It uses the target's detailed information to 11 // provide more precise answers to certain TTI queries, while letting the 12 // target independent and default TTI implementations handle the rest. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #ifndef LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H 17 #define LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H 18 19 #include "Lanai.h" 20 #include "LanaiSubtarget.h" 21 #include "LanaiTargetMachine.h" 22 #include "llvm/Analysis/TargetTransformInfo.h" 23 #include "llvm/CodeGen/BasicTTIImpl.h" 24 #include "llvm/CodeGen/TargetLowering.h" 25 #include "llvm/Support/MathExtras.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 bool shouldBuildLookupTables() const { return false; } 45 46 TargetTransformInfo::PopcntSupportKind getPopcntSupport(unsigned TyWidth) { 47 if (TyWidth == 32) 48 return TTI::PSK_FastHardware; 49 return TTI::PSK_Software; 50 } 51 52 int getIntImmCost(const APInt &Imm, Type *Ty, TTI::TargetCostKind CostKind) { 53 assert(Ty->isIntegerTy()); 54 if (Imm == 0) 55 return TTI::TCC_Free; 56 if (isInt<16>(Imm.getSExtValue())) 57 return TTI::TCC_Basic; 58 if (isInt<21>(Imm.getZExtValue())) 59 return TTI::TCC_Basic; 60 if (isInt<32>(Imm.getSExtValue())) { 61 if ((Imm.getSExtValue() & 0xFFFF) == 0) 62 return TTI::TCC_Basic; 63 return 2 * TTI::TCC_Basic; 64 } 65 66 return 4 * TTI::TCC_Basic; 67 } 68 69 int getIntImmCostInst(unsigned Opc, unsigned Idx, const APInt &Imm, Type *Ty, 70 TTI::TargetCostKind CostKind) { 71 return getIntImmCost(Imm, Ty, CostKind); 72 } 73 74 int getIntImmCostIntrin(Intrinsic::ID IID, unsigned Idx, const APInt &Imm, 75 Type *Ty, TTI::TargetCostKind CostKind) { 76 return getIntImmCost(Imm, Ty, CostKind); 77 } 78 79 unsigned getArithmeticInstrCost( 80 unsigned Opcode, Type *Ty, 81 TTI::TargetCostKind CostKind = TTI::TCK_RecipThroughput, 82 TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue, 83 TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue, 84 TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None, 85 TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None, 86 ArrayRef<const Value *> Args = ArrayRef<const Value *>(), 87 const Instruction *CxtI = nullptr) { 88 int ISD = TLI->InstructionOpcodeToISD(Opcode); 89 90 switch (ISD) { 91 default: 92 return BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Opd1Info, 93 Opd2Info, 94 Opd1PropInfo, Opd2PropInfo); 95 case ISD::MUL: 96 case ISD::SDIV: 97 case ISD::UDIV: 98 case ISD::UREM: 99 // This increases the cost associated with multiplication and division 100 // to 64 times what the baseline arithmetic cost is. The arithmetic 101 // instruction cost was arbitrarily chosen to reduce the desirability 102 // of emitting arithmetic instructions that are emulated in software. 103 // TODO: Investigate the performance impact given specialized lowerings. 104 return 64 * BaseT::getArithmeticInstrCost(Opcode, Ty, CostKind, Opd1Info, 105 Opd2Info, 106 Opd1PropInfo, Opd2PropInfo); 107 } 108 } 109 }; 110 111 } // end namespace llvm 112 113 #endif // LLVM_LIB_TARGET_LANAI_LANAITARGETTRANSFORMINFO_H 114