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
18namespace llvm {
19
20class ARMBaseInstrInfo;
21class ARMBaseRegisterInfo;
22class ARMSubtarget;
23class 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.
29class ARMHazardRecognizer : public ScoreboardHazardRecognizer {
30  MachineInstr *LastMI = nullptr;
31  unsigned FpMLxStalls = 0;
32
33public:
34  ARMHazardRecognizer(const InstrItineraryData *ItinData,
35                      const ScheduleDAG *DAG)
36      : ScoreboardHazardRecognizer(ItinData, DAG, "post-RA-sched") {}
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} // end namespace llvm
46
47#endif
48