scale.backend.mips
Class JumpLabelInstruction

java.lang.Object
  scale.backend.Instruction
      scale.backend.Branch
          scale.backend.mips.MipsBranch
              scale.backend.mips.JumpLabelInstruction

All Implemented Interfaces:

java.lang.Cloneable

public class JumpLabelInstruction
extends MipsBranch

This class represents the Mips jump, and jump & link instructions.

$Id: JumpLabelInstruction.java,v 1.9 2005-03-24 13:56:47 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

value A symbolic representation of the displacement

Fields inherited from class scale.backend.mips.MipsBranch

delaySlot, opcode

Constructor Summary

JumpLabelInstruction(int opcode, Displacement displacement, int numTargets, MipsInstruction delaySlot, boolean link)

Method Summary

void	assembler(Assembler asm, Emit emit) Insert the assembler representation of the instruction into the output stream.
boolean	defs(int register, RegisterSet registers) Return true if the instruction sets the register.
boolean	independent(Instruction inst, RegisterSet registers) Return true if this instruction is independent of the specified instruction.
void	remapRegisters(int[] map) Map the virtual registers referenced in the instruction to the specified real registers.
void	specifyRegisterUsage(RegisterAllocator rs, int index, int strength) Specify the registers used by this instruction.
java.lang.String	toString()

Methods inherited from class scale.backend.mips.MipsBranch

assembleDelay, assembleDisp, canBeDeleted, delayToStringBuf, getDelaySlot, getOpcode, instructionSize, isUnconditional, mods, remapDestRegister, remapSrcRegister, setDelaySlot, setOpcode, uses

Methods inherited from class scale.backend.Branch

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

Methods inherited from class scale.backend.Instruction

clone, ehash, getBBID, getCopyDest, getCopySrc, getDestRegister, 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

value

protected Displacement value

A symbolic representation of the displacement

Constructor Detail

JumpLabelInstruction

public JumpLabelInstruction(int opcode,
                            Displacement displacement,
                            int numTargets,
                            MipsInstruction delaySlot,
                            boolean link)

Method Detail

remapRegisters

public void remapRegisters(int[] map)

Description copied from class: MipsBranch

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 MipsBranch

Parameters:

map - maps from the virtual register to real register

defs

public boolean defs(int register,
                    RegisterSet registers)

Return true if the instruction sets the register.

Overrides:

defs in class MipsBranch

independent

public boolean independent(Instruction inst,
                           RegisterSet registers)

Return true if this instruction is independent of the specified instruction. If instructions are independent, than one instruction can be moved before or after the other instruction without changing the semantics of the program.

Overrides:

independent in class Branch

Parameters:

inst - is the specified instruction

specifyRegisterUsage

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

Specify the registers used by this instruction.

Overrides:

specifyRegisterUsage in class MipsBranch

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)

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