dspl.intermediate.instructions
Class RelationInstruction

java.lang.Object
  dspl.intermediate.instructions.Instruction
      dspl.intermediate.instructions.RelationInstruction

public class RelationInstruction
extends Instruction

This class is used to represent all of the instructions and the comparison necessary for all of the branch and loop instructions that require some representation of the condition that determines if they run or not.

Author:

varun

Field Summary

Variable	arg1 First argument to be compared
Variable	arg2 Second arguement to compared to arg1
int	condition the condition required for what we were given to be true
InstructionSet	statements

Fields inherited from class dspl.intermediate.instructions.Instruction

INST_TYPE_ARITHMATIC, INST_TYPE_BRANCH, INST_TYPE_CCALL, INST_TYPE_FORLOOP, lastInstruction, nextInstruction, prevInstruction

Constructor Summary

RelationInstruction(Variable arg1, Variable arg2, int condition)

Method Summary

int	getInstType()
boolean	usesVariable(Variable foo) Designed to be a recursive call to see if a given variable is used anymore within a code block, after the current instruction.

Methods inherited from class dspl.intermediate.instructions.Instruction

setNextInstruction

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

statements

public InstructionSet statements

arg1

public Variable arg1

First argument to be compared

arg2

public Variable arg2

Second arguement to compared to arg1

condition

public int condition

the condition required for what we were given to be true

Constructor Detail

RelationInstruction

public RelationInstruction(Variable arg1,
                           Variable arg2,
                           int condition)

Method Detail

usesVariable

public boolean usesVariable(Variable foo)

Description copied from class: Instruction

Designed to be a recursive call to see if a given variable is used anymore within a code block, after the current instruction. Intention is to allow a way to parse the Instruction tree to see if a specific variable is used again. NOTE: may not be necessary, or may need to be augmented to return a value indicating how far away from the current instruction will it be used again if desire to perform better register allocation.

Specified by:

usesVariable in class Instruction

Parameters:

foo - the variable to search for to see if it is used

Returns:

getInstType

public int getInstType()

Specified by:

getInstType in class Instruction

Returns:

the instruction type of this instruction