scale.backend.ppc
Class PPCInstruction

java.lang.Object
  scale.backend.Instruction
      scale.backend.ppc.PPCInstruction

All Implemented Interfaces:

java.lang.Cloneable

Direct Known Subclasses:

FcInstruction, FDInstruction, FrInstruction

public class PPCInstruction
extends Instruction

This is the base class for all PPC instructions except branches.

$Id: PPCInstruction.java,v 1.7 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

opcode the instruction opcode

Constructor Summary

PPCInstruction(int opcode)

Method Summary

java.lang.String	assembleDisp(Assembler asm, Displacement disp, int ftn, boolean macosx) Generate a String representation of a Displacement that can be used by the assembly code generater.
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.
boolean	defs(int register, RegisterSet registers) Return true if the instruction sets the register.
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 BranchRegInstruction.
boolean	isLoad() Return true if the instruction is a load.
boolean	isStore() Return true if the instruction is a load.
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	setOpcode(int opcode)
void	specifyRegisterUsage(RegisterAllocator rs, int index, int strength) Specify the registers used and defined 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, getCopyDest, getCopySrc, getDestRegister, getExecutionCycles, getFunctionalUnit, getLoopNumber, getNext, getPredicate, getPredicates, getSrcRegisters, getTag, isBranch, isCopy, isLabel, isMandatory, isMarker, isPhi, isPredicated, isPredicatedOnTrue, isPrefetch, isSpillInstruction, isSpillLoadPoint, isSpillStorePoint, 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

opcode

protected int opcode

the instruction opcode

Constructor Detail

PPCInstruction

public PPCInstruction(int opcode)

Parameters:

opcode - is the instruction's opcode

Method Detail

getOpcode

public final 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

setOpcode

public final void setOpcode(int opcode)

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

instructionSize

public int instructionSize()

Return the number of bytes required for the BranchRegInstruction.

Specified by:

instructionSize 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

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

isLoad

public final boolean isLoad()

Return true if the instruction is a load.

Overrides:

isLoad in class Instruction

isStore

public final boolean isStore()

Return true if the instruction is a load.

Overrides:

isStore in class Instruction

specifyRegisterUsage

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

Specify the registers used and defined by this instruction. Uses must be specified before definitions.

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)

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

canBeDeleted

public boolean canBeDeleted(RegisterSet registers)

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

Overrides:

canBeDeleted in class Instruction

assembleDisp

public java.lang.String assembleDisp(Assembler asm,
                                     Displacement disp,
                                     int ftn,
                                     boolean macosx)

Generate a String representation of a Displacement that can be used by the assembly code generater.

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