llvm/lib/Target/ARM/ARMHazardRecognizer.h

   1 //===-- ARMHazardRecognizer.h - ARM Hazard Recognizers ----------*- 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 defines hazard recognizers for scheduling ARM functions.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H
  14 #define LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H
  15
  16 #include "ARMBaseInstrInfo.h"
  17 #include "llvm/ADT/BitmaskEnum.h"
  18 #include "llvm/ADT/SmallVector.h"
  19 #include "llvm/CodeGen/ScheduleHazardRecognizer.h"
  20 #include "llvm/Support/DataTypes.h"
  21 #include <initializer_list>
  22
  23 namespace llvm {
  24
  25 class DataLayout;
  26 class MachineFunction;
  27 class MachineInstr;
  28 class ScheduleDAG;
  29
  30 // Hazards related to FP MLx instructions
  31 class ARMHazardRecognizerFPMLx : public ScheduleHazardRecognizer {
  32   MachineInstr *LastMI = nullptr;
  33   unsigned FpMLxStalls = 0;
  34
  35 public:
  36   ARMHazardRecognizerFPMLx() { MaxLookAhead = 1; }
  37
  38   HazardType getHazardType(SUnit *SU, int Stalls) override;
  39   void Reset() override;
  40   void EmitInstruction(SUnit *SU) override;
  41   void AdvanceCycle() override;
  42   void RecedeCycle() override;
  43 };
  44
  45 // Hazards related to bank conflicts
  46 class ARMBankConflictHazardRecognizer : public ScheduleHazardRecognizer {
  47   SmallVector<MachineInstr *, 8> Accesses;
  48   const MachineFunction &MF;
  49   const DataLayout &DL;
  50   int64_t DataMask;
  51   bool AssumeITCMBankConflict;
  52
  53 public:
  54   ARMBankConflictHazardRecognizer(const ScheduleDAG *DAG, int64_t DDM,
  55                                   bool ABC);
  56   HazardType getHazardType(SUnit *SU, int Stalls) override;
  57   void Reset() override;
  58   void EmitInstruction(SUnit *SU) override;
  59   void AdvanceCycle() override;
  60   void RecedeCycle() override;
  61
  62 private:
  63   inline HazardType CheckOffsets(unsigned O0, unsigned O1);
  64 };
  65
  66 } // end namespace llvm
  67
  68 #endif