[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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