llvm/lib/Target/AArch64/AArch64TargetTransformInfo.h

//===-- AArch64TargetTransformInfo.h - AArch64 specific TTI -----*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
/// This file a TargetTransformInfo::Concept conforming object specific to the
/// AArch64 target machine. It uses the target's detailed information to
/// provide more precise answers to certain TTI queries, while letting the
/// target independent and default TTI implementations handle the rest.
///
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64TARGETTRANSFORMINFO_H
#define LLVM_LIB_TARGET_AARCH64_AARCH64TARGETTRANSFORMINFO_H

#include "AArch64.h"
#include "AArch64TargetMachine.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/BasicTTIImpl.h"
#include "llvm/Target/TargetLowering.h"
#include <algorithm>

namespace llvm {

class AArch64TTIImpl : public BasicTTIImplBase<AArch64TTIImpl> {
  typedef BasicTTIImplBase<AArch64TTIImpl> BaseT;
  typedef TargetTransformInfo TTI;
  friend BaseT;

  const AArch64TargetMachine *TM;
  const AArch64Subtarget *ST;
  const AArch64TargetLowering *TLI;

  /// Estimate the overhead of scalarizing an instruction. Insert and Extract
  /// are set if the result needs to be inserted and/or extracted from vectors.
  unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract);

  const AArch64Subtarget *getST() const { return ST; }
  const AArch64TargetLowering *getTLI() const { return TLI; }

  enum MemIntrinsicType {
    VECTOR_LDST_TWO_ELEMENTS,
    VECTOR_LDST_THREE_ELEMENTS,
    VECTOR_LDST_FOUR_ELEMENTS
  };

public:
  explicit AArch64TTIImpl(const AArch64TargetMachine *TM, Function &F)
      : BaseT(TM), TM(TM), ST(TM->getSubtargetImpl(F)),
        TLI(ST->getTargetLowering()) {}

  // Provide value semantics. MSVC requires that we spell all of these out.
  AArch64TTIImpl(const AArch64TTIImpl &Arg)
      : BaseT(static_cast<const BaseT &>(Arg)), TM(Arg.TM), ST(Arg.ST),
        TLI(Arg.TLI) {}
  AArch64TTIImpl(AArch64TTIImpl &&Arg)
      : BaseT(std::move(static_cast<BaseT &>(Arg))), TM(std::move(Arg.TM)),
        ST(std::move(Arg.ST)), TLI(std::move(Arg.TLI)) {}
  AArch64TTIImpl &operator=(const AArch64TTIImpl &RHS) {
    BaseT::operator=(static_cast<const BaseT &>(RHS));
    TM = RHS.TM;
    ST = RHS.ST;
    TLI = RHS.TLI;
    return *this;
  }
  AArch64TTIImpl &operator=(AArch64TTIImpl &&RHS) {
    BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
    TM = std::move(RHS.TM);
    ST = std::move(RHS.ST);
    TLI = std::move(RHS.TLI);
    return *this;
  }

  /// \name Scalar TTI Implementations
  /// @{

  using BaseT::getIntImmCost;
  unsigned getIntImmCost(int64_t Val);
  unsigned getIntImmCost(const APInt &Imm, Type *Ty);
  unsigned getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm,
                         Type *Ty);
  unsigned getIntImmCost(Intrinsic::ID IID, unsigned Idx, const APInt &Imm,
                         Type *Ty);
  TTI::PopcntSupportKind getPopcntSupport(unsigned TyWidth);

  /// @}

  /// \name Vector TTI Implementations
  /// @{

  unsigned getNumberOfRegisters(bool Vector) {
    if (Vector) {
      if (ST->hasNEON())
        return 32;
      return 0;
    }
    return 31;
  }

  unsigned getRegisterBitWidth(bool Vector) {
    if (Vector) {
      if (ST->hasNEON())
        return 128;
      return 0;
    }
    return 64;
  }

  unsigned getMaxInterleaveFactor(unsigned VF);

  unsigned getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src);

  unsigned getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index);

  unsigned getArithmeticInstrCost(
      unsigned Opcode, Type *Ty,
      TTI::OperandValueKind Opd1Info = TTI::OK_AnyValue,
      TTI::OperandValueKind Opd2Info = TTI::OK_AnyValue,
      TTI::OperandValueProperties Opd1PropInfo = TTI::OP_None,
      TTI::OperandValueProperties Opd2PropInfo = TTI::OP_None);

  unsigned getAddressComputationCost(Type *Ty, bool IsComplex);

  unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy);

  unsigned getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
                           unsigned AddressSpace);

  unsigned getCostOfKeepingLiveOverCall(ArrayRef<Type *> Tys);

  void getUnrollingPreferences(Loop *L, TTI::UnrollingPreferences &UP);

  Value *getOrCreateResultFromMemIntrinsic(IntrinsicInst *Inst,
                                           Type *ExpectedType);

  bool getTgtMemIntrinsic(IntrinsicInst *Inst, MemIntrinsicInfo &Info);

  /// @}
};

} // end namespace llvm

#endif