text: //===-- ARMHazardRecognizer.h - ARM Hazard Recognizers ----------*- 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
  //
  //===----------------------------------------------------------------------===//
  //
  // This file defines hazard recognizers for scheduling ARM functions.
  //
  //===----------------------------------------------------------------------===//
  
  #ifndef LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H
  #define LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H
  
  #include "ARMBaseInstrInfo.h"
  #include "llvm/ADT/BitmaskEnum.h"
  #include "llvm/ADT/SmallVector.h"
  #include "llvm/CodeGen/ScheduleHazardRecognizer.h"
  #include "llvm/Support/DataTypes.h"
  #include <array>
  #include <initializer_list>
  
  namespace llvm {
  
  class DataLayout;
  class MachineFunction;
  class MachineInstr;
  class ScheduleDAG;
  
  // Hazards related to FP MLx instructions
  class ARMHazardRecognizerFPMLx : public ScheduleHazardRecognizer {
    MachineInstr *LastMI = nullptr;
    unsigned FpMLxStalls = 0;
  
  public:
    ARMHazardRecognizerFPMLx() { MaxLookAhead = 1; }
  
    HazardType getHazardType(SUnit *SU, int Stalls) override;
    void Reset() override;
    void EmitInstruction(SUnit *SU) override;
    void AdvanceCycle() override;
    void RecedeCycle() override;
  };
  
  // Hazards related to bank conflicts
  class ARMBankConflictHazardRecognizer : public ScheduleHazardRecognizer {
    SmallVector<MachineInstr *, 8> Accesses;
    const MachineFunction &MF;
    const DataLayout &DL;
    int64_t DataMask;
    bool AssumeITCMBankConflict;
  
  public:
    ARMBankConflictHazardRecognizer(const ScheduleDAG *DAG, int64_t DDM,
                                    bool ABC);
    HazardType getHazardType(SUnit *SU, int Stalls) override;
    void Reset() override;
    void EmitInstruction(SUnit *SU) override;
    void AdvanceCycle() override;
    void RecedeCycle() override;
  
  private:
    inline HazardType CheckOffsets(unsigned O0, unsigned O1);
  };
  
  } // end namespace llvm
  
  #endif
  