scale.backend.alpha
Class FetchInstruction

java.lang.Object
  scale.backend.Instruction
      scale.backend.alpha.MemoryInstruction
          scale.backend.alpha.FetchInstruction

All Implemented Interfaces:

java.lang.Cloneable

public class FetchInstruction
extends MemoryInstruction

This class represents an Alpha fetch instruction.

$Id: FetchInstruction.java,v 1.18 2006-11-09 14:40:25 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

Fields inherited from class scale.backend.alpha.MemoryInstruction

displacement, opcode, ra, rb, relocType

Constructor Summary

FetchInstruction(int opcode, int rb, boolean mod)

Method Summary

void	assembler(Assembler gen, Emit emit) Insert the assembler representation of the instruction into the output stream.
boolean	independent(Instruction inst, RegisterSet registers) Return true if this instruction is independent of the specified instruction.
void	nullify(RegisterSet rs) Mark the instruction as no longer needed.
void	specifyRegisterUsage(RegisterAllocator rs, int index, int strength) Specify the registers used by this instruction.
boolean	uses(int register, RegisterSet registers) Return true if the instruction uses the register.

Methods inherited from class scale.backend.alpha.MemoryInstruction

getDisplacement, getExecutionCycles, getFunctionalUnit, getOpcode, getRa, getRb, getRelocType, instructionSize, remapDestRegister, remapRegisters, remapSrcRegister, setDisplacement, setRb, toString

Methods inherited from class scale.backend.Instruction

canBeDeleted, clone, copy, defs, ehash, getBBID, getCopyDest, getCopySrc, getDestRegister, getLoopNumber, getNext, getPredicate, getPredicates, getSrcRegisters, getTag, isBranch, isCopy, isLabel, isLoad, isMandatory, isMarker, isPhi, isPredicated, isPredicatedOnTrue, isPrefetch, isSpillInstruction, isSpillLoadPoint, isSpillStorePoint, isStore, markSpillInstruction, mods, 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

Constructor Detail

FetchInstruction

public FetchInstruction(int opcode,
                        int rb,
                        boolean mod)

Method Detail

nullify

public void nullify(RegisterSet rs)

Mark the instruction as no longer needed.

Overrides:

nullify in class Instruction

assembler

public void assembler(Assembler gen,
                      Emit emit)

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

Overrides:

assembler in class MemoryInstruction

specifyRegisterUsage

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

Specify the registers used by this instruction.

Specified by:

specifyRegisterUsage in class Instruction

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 Instruction

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