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Topic 10: Dataflow Analysis - cs.princeton.edu

1 Topic 10: Dataflow AnalysisCOS 320 Compiling TechniquesPrinceton University Spring 2016 Lennart BeringerAnalysis and Transformationanalysis spans multiple proceduressingle-procedure- Analysis : intra-proceduralDataflow Analysis MotivationDataflow Analysis MotivationAssuming only r5 is live-out at instruction AnalysisIterative Dataflow Analysis FrameworkDefinitionsIterative Dataflow Analysis FrameworkDefinitions for Liveness AnalysisDefinitions for Liveness AnalysisRemember generic equations:r1r2r3r1r1r1r2, r3r2r3------Smart ordering: visit nodes in reverse order of , r3r2r3------Smart ordering: visit nodes in reverse order of , r1r3, r1?r1r2r3r1r1r1r2, r3r2r3------Smart ordering: visit nodes in reverse order of , r1r3, r1r3, r2r3, r2r3, r2r3, r2r3, r1r3, r1r3?r1r2r3r1r1r1r2, r3r2r3------Smart ordering: visit nodes in reverse order of , r1r3, r1r3, r2r3, r2r3, r2r3, r2r3, r1r3, r1r3--r3r3, r1::Live Variable Application 1: Register AllocationInterference Graphr1r3?

Topic 10: Dataflow Analysis COS 320 Compiling Techniques Princeton University Spring 2016 Lennart Beringer. Analysis and Transformation analysis spans multiple procedures single-procedure-analysis: intra-procedural. Dataflow Analysis Motivation. Dataflow Analysis Motivation

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