lib/Target/Mips/MipsInstrInfo.h

//===-- MipsInstrInfo.h - Mips 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 Mips implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//

#ifndef MIPSINSTRUCTIONINFO_H
#define MIPSINSTRUCTIONINFO_H

#include "Mips.h"
#include "MipsAnalyzeImmediate.h"
#include "MipsRegisterInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetInstrInfo.h"

#define GET_INSTRINFO_HEADER
#include "MipsGenInstrInfo.inc"

namespace llvm {

class MipsInstrInfo : public MipsGenInstrInfo {
  MipsTargetMachine &TM;
  bool IsN64; bool InMips16Mode;
  const MipsRegisterInfo RI;
  unsigned UncondBrOpc;
public:
  explicit MipsInstrInfo(MipsTargetMachine &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 MipsRegisterInfo &getRegisterInfo() const;

  /// 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(const 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(const MachineInstr *MI,
                                      int &FrameIndex) const;

  /// Branch Analysis
  virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
                             MachineBasicBlock *&FBB,
                             SmallVectorImpl<MachineOperand> &Cond,
                             bool AllowModify) const;
  virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;

private:
  void ExpandRetRA(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                   unsigned Opc) const;
  void ExpandRetRA16(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                   unsigned Opc) const;

  void BuildCondBr(MachineBasicBlock &MBB, MachineBasicBlock *TBB, DebugLoc DL,
                   const SmallVectorImpl<MachineOperand>& Cond) const;
  void ExpandExtractElementF64(MachineBasicBlock &MBB,
                               MachineBasicBlock::iterator I) const;
  void ExpandBuildPairF64(MachineBasicBlock &MBB,
                          MachineBasicBlock::iterator I) const;

public:
  virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
                                MachineBasicBlock *FBB,
                                const SmallVectorImpl<MachineOperand> &Cond,
                                DebugLoc DL) const;
  virtual void copyPhysReg(MachineBasicBlock &MBB,
                           MachineBasicBlock::iterator MI, DebugLoc DL,
                           unsigned DestReg, unsigned SrcReg,
                           bool KillSrc) const;
  virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
                                   MachineBasicBlock::iterator MBBI,
                                   unsigned SrcReg, bool isKill, int FrameIndex,
                                   const TargetRegisterClass *RC,
                                   const TargetRegisterInfo *TRI) const;

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

  virtual bool expandPostRAPseudo(MachineBasicBlock::iterator MI) const;

  virtual MachineInstr* emitFrameIndexDebugValue(MachineFunction &MF,
                                                 int FrameIx, uint64_t Offset,
                                                 const MDNode *MDPtr,
                                                 DebugLoc DL) const;

  virtual
  bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;

  /// Insert nop instruction when hazard condition is found
  virtual void insertNoop(MachineBasicBlock &MBB,
                          MachineBasicBlock::iterator MI) const;

  /// Return the number of bytes of code the specified instruction may be.
  unsigned GetInstSizeInBytes(const MachineInstr *MI) const;
};

namespace Mips {
  /// GetOppositeBranchOpc - Return the inverse of the specified
  /// opcode, e.g. turning BEQ to BNE.
  unsigned GetOppositeBranchOpc(unsigned Opc);

  /// Emit a series of instructions to load an immediate. All instructions
  /// except for the last one are emitted. The function returns the number of
  /// MachineInstrs generated. The opcode-immediate pair of the last
  /// instruction is returned in LastInst, if it is not 0.
  unsigned
  loadImmediate(int64_t Imm, bool IsN64, const TargetInstrInfo &TII,
                MachineBasicBlock& MBB, MachineBasicBlock::iterator II,
                DebugLoc DL, bool LastInstrIsADDiu,
                MipsAnalyzeImmediate::Inst *LastInst);
}

}

#endif