DepGraphStats (Jikes RVM API)

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org.jikesrvm.compilers.opt.depgraph
Class DepGraphStats

java.lang.Object
  org.jikesrvm.compilers.opt.depgraph.DepGraphStats

public class DepGraphStats
extends Object
extends Object

This module provides dependence graph statistics. It will only be used for for experimental measurements, so compile-time overhead is less of a concern.

See Also:: DepGraph

Constructor Summary
`DepGraphStats(DepGraph dg, String bbName)` Create a statistical summary of a dependence graph for a given basic block.

Method Summary
`(package private) int`	`estimateExecutionTime(Instruction instr)` Return an estimate of the number of cycles for a given instruction.
`static void`	`printBasicBlockStatistics(IR ir)` Print the dependence graph stats for all basic blocks in an IR.

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

Constructor Detail

DepGraphStats

DepGraphStats(DepGraph dg,
              String bbName)

Create a statistical summary of a dependence graph for a given basic block.

Parameters:: dg - the dependence graph; bbName - name of the basic block

Method Detail

printBasicBlockStatistics

public static void printBasicBlockStatistics(IR ir)

Print the dependence graph stats for all basic blocks in an IR.

Parameters:: ir - the IR

estimateExecutionTime

int estimateExecutionTime(Instruction instr)

Return an estimate of the number of cycles for a given instruction. Currently, this estimate is comically simple.

Parameters:: instr - the instruction