third_party/llvm-16.0/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.h

//===-- PPCTargetTransformInfo.h - PPC specific TTI -------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
/// This file a TargetTransformInfo::Concept conforming object specific to the
/// PPC 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_POWERPC_PPCTARGETTRANSFORMINFO_H
#define LLVM_LIB_TARGET_POWERPC_PPCTARGETTRANSFORMINFO_H

#include "PPCTargetMachine.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/BasicTTIImpl.h"
#include "llvm/CodeGen/TargetLowering.h"
#include <optional>

namespace llvm {

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

  const PPCSubtarget *ST;
  const PPCTargetLowering *TLI;

  const PPCSubtarget *getST() const { return ST; }
  const PPCTargetLowering *getTLI() const { return TLI; }
  bool mightUseCTR(BasicBlock *BB, TargetLibraryInfo *LibInfo,
                   SmallPtrSetImpl<const Value *> &Visited);

public:
  explicit PPCTTIImpl(const PPCTargetMachine *TM, const Function &F)
      : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
        TLI(ST->getTargetLowering()) {}

  std::optional<Instruction *> instCombineIntrinsic(InstCombiner & IC,
                                                    IntrinsicInst & II) const;

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

  using BaseT::getIntImmCost;
  InstructionCost getIntImmCost(const APInt &Imm, Type *Ty,
                                TTI::TargetCostKind CostKind);

  InstructionCost getIntImmCostInst(unsigned Opcode, unsigned Idx,
                                    const APInt &Imm, Type *Ty,
                                    TTI::TargetCostKind CostKind,
                                    Instruction *Inst = nullptr);
  InstructionCost getIntImmCostIntrin(Intrinsic::ID IID, unsigned Idx,
                                      const APInt &Imm, Type *Ty,
                                      TTI::TargetCostKind CostKind);

  InstructionCost getInstructionCost(const User *U,
                                     ArrayRef<const Value *> Operands,
                                     TTI::TargetCostKind CostKind);

  TTI::PopcntSupportKind getPopcntSupport(unsigned TyWidth);
  bool isHardwareLoopProfitable(Loop *L, ScalarEvolution &SE,
                                AssumptionCache &AC,
                                TargetLibraryInfo *LibInfo,
                                HardwareLoopInfo &HWLoopInfo);
  bool canSaveCmp(Loop *L, BranchInst **BI, ScalarEvolution *SE, LoopInfo *LI,
                  DominatorTree *DT, AssumptionCache *AC,
                  TargetLibraryInfo *LibInfo);
  bool getTgtMemIntrinsic(IntrinsicInst *Inst, MemIntrinsicInfo &Info);
  void getUnrollingPreferences(Loop *L, ScalarEvolution &SE,
                               TTI::UnrollingPreferences &UP,
                               OptimizationRemarkEmitter *ORE);
  void getPeelingPreferences(Loop *L, ScalarEvolution &SE,
                             TTI::PeelingPreferences &PP);
  bool isLSRCostLess(const TargetTransformInfo::LSRCost &C1,
                     const TargetTransformInfo::LSRCost &C2);
  bool isNumRegsMajorCostOfLSR();
  bool shouldBuildRelLookupTables() const;
  /// @}

  /// \name Vector TTI Implementations
  /// @{
  bool useColdCCForColdCall(Function &F);
  bool enableAggressiveInterleaving(bool LoopHasReductions);
  TTI::MemCmpExpansionOptions enableMemCmpExpansion(bool OptSize,
                                                    bool IsZeroCmp) const;
  bool enableInterleavedAccessVectorization();

  enum PPCRegisterClass {
    GPRRC, FPRRC, VRRC, VSXRC
  };
  unsigned getNumberOfRegisters(unsigned ClassID) const;
  unsigned getRegisterClassForType(bool Vector, Type *Ty = nullptr) const;
  const char* getRegisterClassName(unsigned ClassID) const;
  TypeSize getRegisterBitWidth(TargetTransformInfo::RegisterKind K) const;
  unsigned getCacheLineSize() const override;
  unsigned getPrefetchDistance() const override;
  unsigned getMaxInterleaveFactor(unsigned VF);
  InstructionCost vectorCostAdjustmentFactor(unsigned Opcode, Type *Ty1,
                                             Type *Ty2);
  InstructionCost getArithmeticInstrCost(
      unsigned Opcode, Type *Ty, TTI::TargetCostKind CostKind,
      TTI::OperandValueInfo Op1Info = {TTI::OK_AnyValue, TTI::OP_None},
      TTI::OperandValueInfo Op2Info = {TTI::OK_AnyValue, TTI::OP_None},
      ArrayRef<const Value *> Args = ArrayRef<const Value *>(),
      const Instruction *CxtI = nullptr);
  InstructionCost getShuffleCost(TTI::ShuffleKind Kind, Type *Tp,
                                 ArrayRef<int> Mask,
                                 TTI::TargetCostKind CostKind, int Index,
                                 Type *SubTp,
                                 ArrayRef<const Value *> Args = std::nullopt);
  InstructionCost getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src,
                                   TTI::CastContextHint CCH,
                                   TTI::TargetCostKind CostKind,
                                   const Instruction *I = nullptr);
  InstructionCost getCFInstrCost(unsigned Opcode, TTI::TargetCostKind CostKind,
                                 const Instruction *I = nullptr);
  InstructionCost getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy,
                                     CmpInst::Predicate VecPred,
                                     TTI::TargetCostKind CostKind,
                                     const Instruction *I = nullptr);
  using BaseT::getVectorInstrCost;
  InstructionCost getVectorInstrCost(unsigned Opcode, Type *Val,
                                     TTI::TargetCostKind CostKind,
                                     unsigned Index, Value *Op0, Value *Op1);
  InstructionCost
  getMemoryOpCost(unsigned Opcode, Type *Src, MaybeAlign Alignment,
                  unsigned AddressSpace, TTI::TargetCostKind CostKind,
                  TTI::OperandValueInfo OpInfo = {TTI::OK_AnyValue, TTI::OP_None},
                  const Instruction *I = nullptr);
  InstructionCost getInterleavedMemoryOpCost(
      unsigned Opcode, Type *VecTy, unsigned Factor, ArrayRef<unsigned> Indices,
      Align Alignment, unsigned AddressSpace, TTI::TargetCostKind CostKind,
      bool UseMaskForCond = false, bool UseMaskForGaps = false);
  InstructionCost getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
                                        TTI::TargetCostKind CostKind);
  bool areTypesABICompatible(const Function *Caller, const Function *Callee,
                             const ArrayRef<Type *> &Types) const;
  bool hasActiveVectorLength(unsigned Opcode, Type *DataType,
                             Align Alignment) const;
  InstructionCost getVPMemoryOpCost(unsigned Opcode, Type *Src, Align Alignment,
                                    unsigned AddressSpace,
                                    TTI::TargetCostKind CostKind,
                                    const Instruction *I = nullptr);
  bool supportsTailCallFor(const CallBase *CB) const;

private:
  // The following constant is used for estimating costs on power9.
  static const InstructionCost::CostType P9PipelineFlushEstimate = 80;

  /// @}
};

} // end namespace llvm

#endif