scale.backend.alpha
Class IntOpLitInstruction

java.lang.Object
  scale.backend.Instruction
      scale.backend.alpha.IntOpLitInstruction

All Implemented Interfaces:

java.lang.Cloneable

public class IntOpLitInstruction
extends Instruction

This class represents Alpha integer arithmetic instructions that use a literal (0 <= value < 256).

$Id: IntOpLitInstruction.java,v 1.30 2006-11-09 00:56:09 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	ra the ra register.
protected int	rc the rc register
protected int	value the literal value

Constructor Summary

protected

IntOpLitInstruction(int opcode, int ra, int value, int rc)

Method Summary

void	assembler(Assembler gen, Emit emit) Insert the assembler representation of the instruction into the output stream.
boolean	canBeDeleted(RegisterSet registers) Return true if the instruction can be deleted without changing program semantics.
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
int	getCopyDest() Return the source register of a copy instruction.
int	getCopySrc() Return the source register of a copy instruction.
int	getDestRegister() Return the destination register or -1 if none.
int	getExecutionCycles() Return the number of cycles that this instruction requires.
int	getFunctionalUnit() Return the number of the functional unit required to execute this instruction.
int	getOpcode() Return the numeric opcode of the instruction.
boolean	independent(Instruction inst, RegisterSet registers) Return true if this instruction is independent of the specified instruction.
int	instructionSize() Return the number of bytes required for the IntOpLitInstruction.
boolean	isCopy() Return true if the instruction copies a value from one register to another without modification.
void	remapDestRegister(int oldReg, int newReg) Map the registers defined in the instruction as destinations to the specified register.
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.Instruction

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

ra

protected int ra

the ra register.

value

protected int value

the literal value

rc

protected int rc

the rc register

Constructor Detail

IntOpLitInstruction

protected IntOpLitInstruction(int opcode,
                              int ra,
                              int value,
                              int rc)

Method Detail

created

public static int created()

Return the number of instances of this class created.

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.

Specified by:

remapRegisters in class Instruction

Parameters:

map - maps from the virtual register to real register

getDestRegister

public int getDestRegister()

Return the destination register or -1 if none.

Overrides:

getDestRegister in class 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.

Specified by:

remapSrcRegister in class Instruction

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.

Specified by:

remapDestRegister in class Instruction

Parameters:

oldReg - is the previous destination register

newReg - is the new destination register

getOpcode

public int getOpcode()

Description copied from class: Instruction

Return the numeric opcode of the instruction. This opcode may be an encoding of the actual instruction opcode.

Specified by:

getOpcode in class Instruction

getExecutionCycles

public int getExecutionCycles()

Return the number of cycles that this instruction requires.

Overrides:

getExecutionCycles in class Instruction

getFunctionalUnit

public int getFunctionalUnit()

Return the number of the functional unit required to execute this instruction.

Overrides:

getFunctionalUnit 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

defs

public boolean defs(int register,
                    RegisterSet registers)

Return true if the instruction sets the register

Overrides:

defs 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.

Specified by:

independent in class Instruction

Parameters:

inst - is the specified instruction

instructionSize

public int instructionSize()

Return the number of bytes required for the IntOpLitInstruction.

Specified by:

instructionSize in class Instruction

canBeDeleted

public boolean canBeDeleted(RegisterSet registers)

Return true if the instruction can be deleted without changing program semantics.

Overrides:

canBeDeleted in class Instruction

isCopy

public boolean isCopy()

Return true if the instruction copies a value from one register to another without modification. Transfers between integer and floating point registers are not considered to be copy instructions.

Overrides:

isCopy in class Instruction

getCopySrc

public int getCopySrc()

Return the source register of a copy instruction.

Overrides:

getCopySrc in class Instruction

getCopyDest

public int getCopyDest()

Return the source register of a copy instruction.

Overrides:

getCopyDest in class Instruction

assembler

public void assembler(Assembler gen,
                      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 java.lang.Object