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 = nullptr;
31   unsigned FpMLxStalls = 0;
32 
33 public:
ARMHazardRecognizer(const InstrItineraryData * ItinData,const ScheduleDAG * DAG)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