scale.backend.alpha
Class StoreInstruction

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

All Implemented Interfaces:

java.lang.Cloneable

public class StoreInstruction
extends MemoryInstruction

This class represents Alpha store instructions.

$Id: StoreInstruction.java,v 1.23 2005-02-07 21:27:21 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

StoreInstruction(int opcode, int ra, int rb)

StoreInstruction(int opcode, int ra, int rb, Displacement displacement)

StoreInstruction(int opcode, int ra, int rb, Displacement displacement, int relocType)

Method Summary

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.
boolean	independent(Instruction inst, RegisterSet registers) Return true if this instruction is independent of the specified instruction.
boolean	isStore() Return true if this is a store-into- memory instruction.
boolean	mods(int register, RegisterSet registers) Return true if the instruction sets the register.
void	nullify(RegisterSet rs) Mark the instruction as no longer needed.
void	remapDestRegister(int oldReg, int newReg) Map the registers defined in the instruction as destinations to the specified register.
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.
boolean	uses(int register, RegisterSet registers) Return true if the instruction uses the register.

Methods inherited from class scale.backend.alpha.MemoryInstruction

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

Methods inherited from class scale.backend.Instruction

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

Constructor Detail

StoreInstruction

public StoreInstruction(int opcode,
                        int ra,
                        int rb)

StoreInstruction

public StoreInstruction(int opcode,
                        int ra,
                        int rb,
                        Displacement displacement)

StoreInstruction

public StoreInstruction(int opcode,
                        int ra,
                        int rb,
                        Displacement displacement,
                        int relocType)

Method Detail

created

public static int created()

Return the number of instances of this class created.

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 MemoryInstruction

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 MemoryInstruction

Parameters:

oldReg - is the previous destination register

newReg - is the new destination register

isStore

public boolean isStore()

Return true if this is a store-into- memory instruction.

Overrides:

isStore in class Instruction

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

mods

public boolean mods(int register,
                    RegisterSet registers)

Return true if the instruction sets the register.

Overrides:

mods 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

defs

public boolean defs(int register,
                    RegisterSet registers)

Return true if the instruction sets the register.

Overrides:

defs in class Instruction

nullify

public void nullify(RegisterSet rs)

Mark the instruction as no longer needed.

Overrides:

nullify in class Instruction