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
70