scale.backend.sparc
Class ReturnInstruction

java.lang.Object
  scale.backend.Instruction
      scale.backend.Branch
          scale.backend.sparc.SparcBranch
              scale.backend.sparc.ReturnInstruction

All Implemented Interfaces:

java.lang.Cloneable

public class ReturnInstruction
extends SparcBranch

This class represents Sparc integer arithmetic instructions with two register arguments and a function code in place of a destination register..

$Id: ReturnInstruction.java,v 1.23 2006-10-04 13:59:16 burrill Exp $

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

Instance=07, Op=1x, Op3=111001

Field Summary

protected int	rs1 the rs1 register
protected int	rs2 the rs2 register

Fields inherited from class scale.backend.sparc.SparcBranch

annulled, delaySlot, opcode, pt

Constructor Summary

ReturnInstruction(int rs1, int rs2, SparcInstruction delaySlot)

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.
int	getDestRegister() Return the destination register or -1 if none.
int[]	getSrcRegisters() Return the source registers or null if none.
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()
boolean	uses(int register, RegisterSet registers) Return true if the instruction uses the register.

Methods inherited from class scale.backend.sparc.SparcBranch

assembleDelay, assembleDisp, canBeAnnulled, canBeDeleted, defs, delayToStringBuf, getAnnulled, getDelaySlot, getOpcode, getPt, instructionSize, isUnconditional, mods, remapDestRegister, remapSrcRegister, setAnnulled, setDelaySlot, setOpcode, setReturnedStructSize

Methods inherited from class scale.backend.Branch

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

Methods inherited from class scale.backend.Instruction

clone, ehash, getBBID, getCopyDest, getCopySrc, getFunctionalUnit, getLoopNumber, getNext, getPredicate, getPredicates, 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

rs1

protected int rs1

the rs1 register

rs2

protected int rs2

the rs2 register

Constructor Detail

ReturnInstruction

public ReturnInstruction(int rs1,
                         int rs2,
                         SparcInstruction delaySlot)

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

getSrcRegisters

public int[] getSrcRegisters()

Return the source registers or null if none.

Overrides:

getSrcRegisters in class Instruction

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 SparcBranch

Parameters:

map - maps from the virtual register to real register

specifyRegisterUsage

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

Specify the registers used by this instruction.

Overrides:

specifyRegisterUsage in class SparcBranch

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 SparcBranch

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