lib/Target/ARM/Thumb2InstrInfo.h

//===- Thumb2InstrInfo.h - Thumb-2 Instruction Information ------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the Thumb-2 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//

#ifndef THUMB2INSTRUCTIONINFO_H
#define THUMB2INSTRUCTIONINFO_H

#include "llvm/Target/TargetInstrInfo.h"
#include "ARM.h"
#include "ARMInstrInfo.h"
#include "Thumb2RegisterInfo.h"

namespace llvm {
class ARMSubtarget;
class ScheduleHazardRecognizer;

class Thumb2InstrInfo : public ARMBaseInstrInfo {
  Thumb2RegisterInfo RI;
public:
  explicit Thumb2InstrInfo(const ARMSubtarget &STI);

  // Return the non-pre/post incrementing version of 'Opc'. Return 0
  // if there is not such an opcode.
  unsigned getUnindexedOpcode(unsigned Opc) const;

  void ReplaceTailWithBranchTo(MachineBasicBlock::iterator Tail,
                               MachineBasicBlock *NewDest) const;

  bool isLegalToSplitMBBAt(MachineBasicBlock &MBB,
                           MachineBasicBlock::iterator MBBI) const;

  bool isProfitableToIfCvt(MachineBasicBlock &MBB, unsigned NumInstrs) const;
  
  bool isProfitableToIfCvt(MachineBasicBlock &TMBB, unsigned NumTInstrs,
                           MachineBasicBlock &FMBB, unsigned NumFInstrs) const;

  bool copyRegToReg(MachineBasicBlock &MBB,
                    MachineBasicBlock::iterator I,
                    unsigned DestReg, unsigned SrcReg,
                    const TargetRegisterClass *DestRC,
                    const TargetRegisterClass *SrcRC,
                    DebugLoc DL) const;

  void storeRegToStackSlot(MachineBasicBlock &MBB,
                           MachineBasicBlock::iterator MBBI,
                           unsigned SrcReg, bool isKill, int FrameIndex,
                           const TargetRegisterClass *RC,
                           const TargetRegisterInfo *TRI) const;

  void loadRegFromStackSlot(MachineBasicBlock &MBB,
                            MachineBasicBlock::iterator MBBI,
                            unsigned DestReg, int FrameIndex,
                            const TargetRegisterClass *RC,
                            const TargetRegisterInfo *TRI) const;

  /// scheduleTwoAddrSource - Schedule the copy / re-mat of the source of the
  /// two-addrss instruction inserted by two-address pass.
  void scheduleTwoAddrSource(MachineInstr *SrcMI, MachineInstr *UseMI,
                             const TargetRegisterInfo &TRI) const;

  /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
  /// such, whenever a client has an instance of instruction info, it should
  /// always be able to get register info as well (through this method).
  ///
  const Thumb2RegisterInfo &getRegisterInfo() const { return RI; }

  ScheduleHazardRecognizer *
  CreateTargetPostRAHazardRecognizer(const InstrItineraryData &II) const;
};

/// getITInstrPredicate - Valid only in Thumb2 mode. This function is identical
/// to llvm::getInstrPredicate except it returns AL for conditional branch
/// instructions which are "predicated", but are not in IT blocks.
ARMCC::CondCodes getITInstrPredicate(const MachineInstr *MI, unsigned &PredReg);


}

#endif // THUMB2INSTRUCTIONINFO_H