GlobalValueNumber (Jikes RVM API)

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org.jikesrvm.compilers.opt.ssa
Class GlobalValueNumber

java.lang.Object
  org.jikesrvm.compilers.opt.driver.CompilerPhase
      org.jikesrvm.compilers.opt.ssa.GlobalValueNumber

class GlobalValueNumber
extends CompilerPhase
extends CompilerPhase

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

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

Fields inherited from class org.jikesrvm.compilers.opt.driver.CompilerPhase
`container`

Constructor Summary
`GlobalValueNumber()`

Method Summary
`String`	`getName()` Return the name of this phase.
`CompilerPhase`	`newExecution(IR ir)` Return this instance of this phase.
`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 class org.jikesrvm.compilers.opt.driver.CompilerPhase
`dumpIR, dumpIR, getClassConstructor, getCompilerPhaseConstructor, getCompilerPhaseConstructor, performPhase, printingEnabled, reportAdditionalStats, setContainer, shouldPerform, verify`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

DEBUG

private static final boolean DEBUG

Print verbose debugging output?

See Also:: Constant Field Values

Constructor Detail

GlobalValueNumber

GlobalValueNumber()

Method Detail

newExecution

public CompilerPhase newExecution(IR ir)

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

Overrides:: newExecution in class CompilerPhase

Parameters:: ir - not used
Returns:: this

getName

public final String getName()

Return the name of this phase.

Specified by:: getName in class CompilerPhase

Returns:: "Global Value Number"

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

Specified by:: perform in class CompilerPhase

Parameters:: ir - the governing IR