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//===-- 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.


#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;

  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