aboutsummaryrefslogtreecommitdiffstats
path: root/lib/Target/ARM/ARMHazardRecognizer.h
blob: 98bfc4cf0cc552947deaad6e417c7875bfd390c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
//===-- ARMHazardRecognizer.h - ARM Hazard Recognizers ----------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines hazard recognizers for scheduling ARM functions.
//
//===----------------------------------------------------------------------===//

#ifndef ARMHAZARDRECOGNIZER_H
#define ARMHAZARDRECOGNIZER_H

#include "llvm/CodeGen/ScoreboardHazardRecognizer.h"

namespace llvm {

class ARMBaseInstrInfo;
class ARMBaseRegisterInfo;
class ARMSubtarget;
class MachineInstr;

/// ARMHazardRecognizer handles special constraints that are not expressed in
/// the scheduling itinerary. This is only used during postRA scheduling. The
/// ARM preRA scheduler uses an unspecialized instance of the
/// ScoreboardHazardRecognizer.
class ARMHazardRecognizer : public ScoreboardHazardRecognizer {
  const ARMBaseInstrInfo &TII;
  const ARMBaseRegisterInfo &TRI;
  const ARMSubtarget &STI;

  MachineInstr *LastMI;
  unsigned FpMLxStalls;

public:
  ARMHazardRecognizer(const InstrItineraryData *ItinData,
                      const ARMBaseInstrInfo &tii,
                      const ARMBaseRegisterInfo &tri,
                      const ARMSubtarget &sti,
                      const ScheduleDAG *DAG) :
    ScoreboardHazardRecognizer(ItinData, DAG, "post-RA-sched"), TII(tii),
    TRI(tri), STI(sti), LastMI(0) {}

  virtual HazardType getHazardType(SUnit *SU, int Stalls);
  virtual void Reset();
  virtual void EmitInstruction(SUnit *SU);
  virtual void AdvanceCycle();
  virtual void RecedeCycle();
};

} // end namespace llvm

#endif // ARMHAZARDRECOGNIZER_H