lib/Target/PIC16/PIC16InstrInfo.h

//===- PIC16InstrInfo.h - PIC16 Instruction Information----------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the niversity of Illinois Open Source 
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the PIC16 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//

#ifndef PIC16INSTRUCTIONINFO_H
#define PIC16INSTRUCTIONINFO_H

#include "PIC16.h"
#include "PIC16RegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"

namespace llvm {


class PIC16InstrInfo : public TargetInstrInfoImpl 
{
  PIC16TargetMachine &TM;
  const PIC16RegisterInfo RI;
public:
  explicit PIC16InstrInfo(PIC16TargetMachine &TM);

  /// 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).
  ///
  virtual const PIC16RegisterInfo &getRegisterInfo() const { return RI; }

  
  /// isLoadFromStackSlot - If the specified machine instruction is a direct
  /// load from a stack slot, return the virtual or physical register number of
  /// the destination along with the FrameIndex of the loaded stack slot.  If
  /// not, return 0.  This predicate must return 0 if the instruction has
  /// any side effects other than loading from the stack slot.
  virtual unsigned isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const;
  
  /// isStoreToStackSlot - If the specified machine instruction is a direct
  /// store to a stack slot, return the virtual or physical register number of
  /// the source reg along with the FrameIndex of the loaded stack slot.  If
  /// not, return 0.  This predicate must return 0 if the instruction has
  /// any side effects other than storing to the stack slot.
  virtual unsigned isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const;
 
  /// Used for spilling a register
  void storeRegToStackSlot(MachineBasicBlock &MBB,
                           MachineBasicBlock::iterator MI,
                           unsigned SrcReg, bool isKill, int FrameIndex,
                           const TargetRegisterClass *RC) const;


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

  /// InsertBranch - Insert a branch into the end of the specified
  /// MachineBasicBlock.  This operands to this method are the same as those
  /// returned by AnalyzeBranch.  This is invoked in cases where AnalyzeBranch
  /// returns success and when an unconditional branch (TBB is non-null, FBB is
  /// null, Cond is empty) needs to be inserted. It returns the number of
  /// instructions inserted.
  virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
                                MachineBasicBlock *FBB,
                            const SmallVectorImpl<MachineOperand> &Cond) const ; 

};

} // namespace llvm

#endif