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 <array>
  22 #include <initializer_list>
  23
  24 namespace llvm {
  25
  26 class DataLayout;
  27 class MachineFunction;
  28 class MachineInstr;
  29 class ScheduleDAG;
  30
  31 // Hazards related to FP MLx instructions
  32 class ARMHazardRecognizerFPMLx : public ScheduleHazardRecognizer {
  33   MachineInstr *LastMI = nullptr;
  34   unsigned FpMLxStalls = 0;
  35
  36 public:
  37   ARMHazardRecognizerFPMLx() : ScheduleHazardRecognizer() { MaxLookAhead = 1; }
  38
  39   HazardType getHazardType(SUnit *SU, int Stalls) override;
  40   void Reset() override;
  41   void EmitInstruction(SUnit *SU) override;
  42   void AdvanceCycle() override;
  43   void RecedeCycle() override;
  44 };
  45
  46 // Hazards related to bank conflicts
  47 class ARMBankConflictHazardRecognizer : public ScheduleHazardRecognizer {
  48   SmallVector<MachineInstr *, 8> Accesses;
  49   const MachineFunction &MF;
  50   const DataLayout &DL;
  51   int64_t DataMask;
  52   bool AssumeITCMBankConflict;
  53
  54 public:
  55   ARMBankConflictHazardRecognizer(const ScheduleDAG *DAG, int64_t DDM,
  56                                   bool ABC);
  57   HazardType getHazardType(SUnit *SU, int Stalls) override;
  58   void Reset() override;
  59   void EmitInstruction(SUnit *SU) override;
  60   void AdvanceCycle() override;
  61   void RecedeCycle() override;
  62
  63 private:
  64   inline HazardType CheckOffsets(unsigned O0, unsigned O1);
  65 };
  66
  67 } // end namespace llvm
  68
  69 #endif