scale.backend.ppc
Class LoadxInstruction

java.lang.Object
  scale.backend.Instruction
      scale.backend.ppc.PPCInstruction
          scale.backend.ppc.FrInstruction
              scale.backend.ppc.MemoryInstruction
                  scale.backend.ppc.LoadInstruction
                      scale.backend.ppc.LoadxInstruction

All Implemented Interfaces:

java.lang.Cloneable

public class LoadxInstruction
extends LoadInstruction

This is the base class for all PPC Memory-format, indexed load instructions.

$Id: LoadxInstruction.java,v 1.5 2006-11-09 00:56:06 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 int

rb The second use register value

Fields inherited from class scale.backend.ppc.MemoryInstruction

dftn, displacement, macosx, rd

Fields inherited from class scale.backend.ppc.FrInstruction

ra

Fields inherited from class scale.backend.ppc.PPCInstruction

opcode

Constructor Summary

LoadxInstruction(int opcode, int rd, int ra, int rb)

Method Summary

void	assembler(Assembler asm, Emit emit) Insert the assembler representation of the instruction into the output stream.
int	getDestRegister() Return the destination register or -1 if none.
int[]	getSrcRegisters() Return the source registers or null if none.
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	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.ppc.LoadInstruction

defs, mods

Methods inherited from class scale.backend.ppc.PPCInstruction

assembleDisp, canBeDeleted, getOpcode, instructionSize, isLoad, isStore, remapDestRegister, setOpcode

Methods inherited from class scale.backend.Instruction

clone, copy, ehash, getBBID, getCopyDest, getCopySrc, getExecutionCycles, getFunctionalUnit, getLoopNumber, getNext, getPredicate, getPredicates, getTag, isBranch, isCopy, isLabel, isMandatory, isMarker, isPhi, isPredicated, isPredicatedOnTrue, isPrefetch, isSpillInstruction, isSpillLoadPoint, isSpillStorePoint, markSpillInstruction, nullified, nullify, 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

rb

protected int rb

The second use register value

Constructor Detail

LoadxInstruction

public LoadxInstruction(int opcode,
                        int rd,
                        int ra,
                        int rb)

Parameters:

opcode - is the instruction's opcode

rd - is the destination register

ra - is the source register

rb - is the other source register

Method Detail

getDestRegister

public int getDestRegister()

Return the destination register or -1 if none.

Overrides:

getDestRegister in class LoadInstruction

getSrcRegisters

public int[] getSrcRegisters()

Return the source registers or null if none.

Overrides:

getSrcRegisters in class LoadInstruction

specifyRegisterUsage

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

Specify the registers used by this instruction.

Overrides:

specifyRegisterUsage in class LoadInstruction

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.

Overrides:

assembler in class MemoryInstruction

toString

public java.lang.String toString()

Overrides:

toString in class MemoryInstruction

uses

public boolean uses(int register,
                    RegisterSet registers)

Return true if the instruction uses the register.

Overrides:

uses in class FrInstruction

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 MemoryInstruction

Parameters:

inst - is the specified instruction

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 FrInstruction

Parameters:

oldReg - is the previous source register

newReg - is the new source register

remapRegisters

public void remapRegisters(int[] map)

Description copied from class: Instruction

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 MemoryInstruction

Parameters:

map - maps from the virtual register to real register