LiveRangeSplitting (Jikes RVM API)

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org.jikesrvm.compilers.opt.ssa
Class LiveRangeSplitting

java.lang.Object
  org.jikesrvm.compilers.opt.driver.OptimizationPlanElement
      org.jikesrvm.compilers.opt.driver.OptimizationPlanCompositeElement
          org.jikesrvm.compilers.opt.ssa.LiveRangeSplitting

public class LiveRangeSplitting
extends OptimizationPlanCompositeElement
extends OptimizationPlanCompositeElement

Perform live-range splitting.

This pass splits live ranges where they enter and exit loop bodies by normal (unexceptional) control flow. It splits a live range for register r by inserting the instruction r = SPLIT r . Then, SSA renaming will introduce a new name for r. The SPLIT operator is later turned into a MOVE during BURS.

This pass also splits live ranges on edges to and from infrequent code.

This composite phase should be performed at the end of SSA in LIR.

Nested Class Summary
`private static class`	`LiveRangeSplitting.LiveRangeSplittingPhase`
`private static class`	`LiveRangeSplitting.RenamePreparation` This class sets up the IR state prior to entering SSA.

Constructor Summary
`LiveRangeSplitting()` Build this phase as a composite of others.

Method Summary
`boolean`	`shouldPerform(OptOptions options)` Determine, possibly by consulting the passed options object, if this optimization plan element should be performed.

Methods inherited from class org.jikesrvm.compilers.opt.driver.OptimizationPlanCompositeElement
`compose, elapsedTime, getName, initializeForMeasureCompilation, perform, printingEnabled, reportStats`

Methods inherited from class org.jikesrvm.compilers.opt.driver.OptimizationPlanElement
`prettyPrintTime`

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

Constructor Detail

LiveRangeSplitting

public LiveRangeSplitting()

Build this phase as a composite of others.

Method Detail

shouldPerform

public final boolean shouldPerform(OptOptions options)

Description copied from class: OptimizationPlanElement

Determine, possibly by consulting the passed options object, if this optimization plan element should be performed.

Overrides:: shouldPerform in class OptimizationPlanCompositeElement

Parameters:: options - The Options object for the current compilation.
Returns:: true if the plan element should be performed.