1 //===-- ARMHazardRecognizer.h - ARM Hazard Recognizers ----------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines hazard recognizers for scheduling ARM functions.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H
15 #define LLVM_LIB_TARGET_ARM_ARMHAZARDRECOGNIZER_H
16 
17 #include "llvm/CodeGen/ScoreboardHazardRecognizer.h"
18 
19 namespace llvm {
20 
21 class ARMBaseInstrInfo;
22 class ARMBaseRegisterInfo;
23 class ARMSubtarget;
24 class MachineInstr;
25 
26 /// ARMHazardRecognizer handles special constraints that are not expressed in
27 /// the scheduling itinerary. This is only used during postRA scheduling. The
28 /// ARM preRA scheduler uses an unspecialized instance of the
29 /// ScoreboardHazardRecognizer.
30 class ARMHazardRecognizer : public ScoreboardHazardRecognizer {
31   MachineInstr *LastMI;
32   unsigned FpMLxStalls;
33 
34 public:
ARMHazardRecognizer(const InstrItineraryData * ItinData,const ScheduleDAG * DAG)35   ARMHazardRecognizer(const InstrItineraryData *ItinData,
36                       const ScheduleDAG *DAG)
37     : ScoreboardHazardRecognizer(ItinData, DAG, "post-RA-sched"),
38       LastMI(nullptr) {}
39 
40   HazardType getHazardType(SUnit *SU, int Stalls) override;
41   void Reset() override;
42   void EmitInstruction(SUnit *SU) override;
43   void AdvanceCycle() override;
44   void RecedeCycle() override;
45 };
46 
47 } // end namespace llvm
48 
49 #endif
50