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