scale.backend.alpha
Class JmpInstruction

java.lang.Object
  scale.backend.Instruction
      scale.backend.Branch
          scale.backend.alpha.JmpInstruction

All Implemented Interfaces:

java.lang.Cloneable

public final class JmpInstruction
extends Branch

This class represents Alpha jmp instructions.

$Id: JmpInstruction.java,v 1.28 2006-02-06 21:07:11 burrill Exp $

Copyright 2005 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

Field Summary

protected Displacement	displacement the displacement
protected int	ra the ra register.
protected int	rb the rb register

Constructor Summary

JmpInstruction(int opcode, int rb, int numTargets)

JmpInstruction(int opcode, int ra, int rb, Displacement displacement, int numTargets)

JmpInstruction(int opcode, int ra, int rb, int numTargets)

Method Summary

void	assembler(Assembler asm, Emit emit) Insert the assembler representation of the instruction into the output stream.
static int	created() Return the number of instances of this class created.
boolean	defs(int register, RegisterSet registers) Return true if the instruction sets the register
int	getDestRegister() Return the destination register or -1 if none.
int	getExecutionCycles() Return the number of cycles that this instruction requires.
int	getOpcode() Return the numeric opcode of the instruction.
int	instructionSize() Return the number of bytes required for the instruction.
boolean	mods(int register, RegisterSet registers) Return true if the instruction clobbers the register.
void	remapDestRegister(int oldReg, int newReg) Map the registers defined in the instruction as destinations to the specified register.
void	remapRegisters(int[] map) Map the virtual registers referenced in the instruction to the specified real registers.
void	remapSrcRegister(int oldReg, int newReg) Map the registers used in the instruction as sources to the specified register.
void	specifyRegisterUsage(RegisterAllocator rs, int index, int strength) Specify the registers used by this instruction.
java.lang.String	toString()
boolean	uses(int register, RegisterSet registers) Return true if the instruction uses the register.

Methods inherited from class scale.backend.Branch

additionalRegsKilled, additionalRegsSet, additionalRegsUsed, addTarget, copy, getBranchProbability, getRegsKilled, getTarget, independent, isBranch, isCall, markAsCall, nullify, numTargets, setBranchProbability, uses

Methods inherited from class scale.backend.Instruction

canBeDeleted, clone, ehash, getBBID, getCopyDest, getCopySrc, getFunctionalUnit, getLoopNumber, getNext, getPredicate, getPredicates, getSrcRegisters, getTag, isCopy, isLabel, isLoad, isMandatory, isMarker, isPhi, isPredicated, isPredicatedOnTrue, isPrefetch, isSpillInstruction, isSpillLoadPoint, isSpillStorePoint, isStore, markSpillInstruction, nullified, numPredicates, removePredicates, setBBID, setLoopNumber, setMandatory, setNext, setPredicate, setPredicate, setPredicatedOnTrue, setPredicates, setsSpecialReg, setTag, specifyNotSpillLoadPoint, specifySpillStorePoint

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ra

protected int ra

the ra register.

rb

protected int rb

the rb register

displacement

protected Displacement displacement

the displacement

Constructor Detail

JmpInstruction

public JmpInstruction(int opcode,
                      int ra,
                      int rb,
                      int numTargets)

JmpInstruction

public JmpInstruction(int opcode,
                      int ra,
                      int rb,
                      Displacement displacement,
                      int numTargets)

JmpInstruction

public JmpInstruction(int opcode,
                      int rb,
                      int numTargets)

Method Detail

created

public static int created()

Return the number of instances of this class created.

getDestRegister

public int getDestRegister()

Return the destination register or -1 if none.

Overrides:

getDestRegister in class Instruction

getExecutionCycles

public int getExecutionCycles()

Return the number of cycles that this instruction requires.

Overrides:

getExecutionCycles in class Branch

remapRegisters

public void remapRegisters(int[] map)

Description copied from class: Branch

Map the virtual registers referenced in the instruction to the specified real registers. The mapping is specified using an array that is indexed by the virtual register to return the real register.

Overrides:

remapRegisters in class Branch

Parameters:

map - maps from the virtual register to real register

remapSrcRegister

public void remapSrcRegister(int oldReg,
                             int newReg)

Map the registers used in the instruction as sources to the specified register. If the register is not used as a source register, no change is made.

Overrides:

remapSrcRegister in class Branch

Parameters:

oldReg - is the previous source register

newReg - is the new source register

remapDestRegister

public void remapDestRegister(int oldReg,
                              int newReg)

Map the registers defined in the instruction as destinations to the specified register. If the register is not used as a destination register, no change is made.

Overrides:

remapDestRegister in class Branch

Parameters:

oldReg - is the previous destination register

newReg - is the new destination register

getOpcode

public int getOpcode()

Description copied from class: Instruction

Return the numeric opcode of the instruction. This opcode may be an encoding of the actual instruction opcode.

Specified by:

getOpcode in class Instruction

specifyRegisterUsage

public void specifyRegisterUsage(RegisterAllocator rs,
                                 int index,
                                 int strength)

Specify the registers used by this instruction.

Overrides:

specifyRegisterUsage in class Branch

Parameters:

rs - is the register set in use

index - is an index associated with the instruction

strength - is the importance of the instruction

See Also:

RegisterAllocator.useRegister(int,int,int), RegisterAllocator.defRegister(int,int)

uses

public boolean uses(int register,
                    RegisterSet registers)

Return true if the instruction uses the register.

Overrides:

uses in class Branch

defs

public boolean defs(int register,
                    RegisterSet registers)

Return true if the instruction sets the register

Overrides:

defs in class Branch

mods

public boolean mods(int register,
                    RegisterSet registers)

Return true if the instruction clobbers the register.

Overrides:

mods in class Branch

instructionSize

public int instructionSize()

Return the number of bytes required for the instruction.

Specified by:

instructionSize in class Instruction

assembler

public void assembler(Assembler asm,
                      Emit emit)

Insert the assembler representation of the instruction into the output stream.

Specified by:

assembler in class Instruction

toString

public java.lang.String toString()

Overrides:

toString in class Branch