GlobalValueNumber documentation

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DETAIL: FIELD CONSTR ENUM METHOD ELEMENT

org.jikesrvm.compilers.opt.ssa

Class GlobalValueNumber

package class GlobalValueNumber
extends CompilerPhase

This class implements global value numbering ala Alpern, Wegman and Zadeck, PoPL 88. See Muchnick p.348 for a nice discussion.

SinceNot specified.

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AuthorNot specified.

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Field Summary
private static final boolean	DEBUG Print verbose debugging output?

Fields inherited from org.jikesrvm.compilers.opt.driverCompilerPhase
container

Constructor Summary
GlobalValueNumber() No description provided.

Method Summary
final String	getName() Return the name of this phase.
CompilerPhase	newExecution( IR ir ) Return this instance of this phase.
final void	perform( IR ir ) Main driver for global value number-related computations PRECONDITION: Array SSA form POSTCONDITION: ir.valueNumbers holds global value number state

Methods inherited from org.jikesrvm.compilers.opt.driverCompilerPhase
dumpIR (IR, String) getClassConstructor () getCompilerPhaseConstructor (Class<? extends CompilerPhase>) getCompilerPhaseConstructor (Class<? extends CompilerPhase>, Class<?>[]) performPhase (IR) printingEnabled (OptOptions, boolean) reportAdditionalStats () setContainer (OptimizationPlanAtomicElement) shouldPerform (OptOptions) verify (IR)

Methods inherited from java.langObject
clone () equals (Object) finalize () getClass () hashCode () notify () notifyAll () toString () wait (long) wait (long, int) wait ()

Field Detail

DEBUG

private static final boolean DEBUG

Print verbose debugging output?

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Constructor Detail

GlobalValueNumber

GlobalValueNumber ( )

No description provided.

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Method Detail

getName

public final String getName ( )

Return the name of this phase.

Overrides method in CompilerPhase

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newExecution

public CompilerPhase newExecution ( IR ir )

Return this instance of this phase. This phase contains no per-compilation instance fields.

Overrides method in CompilerPhase

Parameters

Type	Name	Description
IR	ir	not used

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perform

public final void perform ( IR ir )

Main driver for global value number-related computations

PRECONDITION: Array SSA form

POSTCONDITION: ir.valueNumbers holds global value number state

Overrides method in CompilerPhase

Parameters

Type	Name	Description
IR	ir	the governing IR

Returns void No description provided.

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