[Webkit-unassigned] [Bug 69906] New: ValueProfile::computeUpdatedPrediction doesn't merge statistics correctly

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Oct 11 23:14:23 PDT 2011


https://bugs.webkit.org/show_bug.cgi?id=69906

           Summary: ValueProfile::computeUpdatedPrediction doesn't merge
                    statistics correctly
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


computeUpdatedPrediction() will return PredictOther when a value profile has a mix of types.  PredictOther means Undefined or Null, so that's clearly wrong.

Currently this should be benign, in the sense that it should just cause speculation failures.  But that's not so great for performance.

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