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 "llvm/CodeGen/ScoreboardHazardRecognizer.h"
  17
  18 namespace llvm {
  19
  20 class ARMBaseInstrInfo;
  21 class ARMBaseRegisterInfo;
  22 class ARMSubtarget;
  23 class MachineInstr;
  24
  25 /// ARMHazardRecognizer handles special constraints that are not expressed in
  26 /// the scheduling itinerary. This is only used during postRA scheduling. The
  27 /// ARM preRA scheduler uses an unspecialized instance of the
  28 /// ScoreboardHazardRecognizer.
  29 class ARMHazardRecognizer : public ScoreboardHazardRecognizer {
  30   MachineInstr *LastMI;
  31   unsigned FpMLxStalls;
  32
  33 public:
  34   ARMHazardRecognizer(const InstrItineraryData *ItinData,
  35                       const ScheduleDAG *DAG)
  36     : ScoreboardHazardRecognizer(ItinData, DAG, "post-RA-sched"),
  37       LastMI(nullptr) {}
  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 } // end namespace llvm
  47
  48 #endif