[Webkit-unassigned] [Bug 141632] New: Rare case profiling should actually work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=141632

            Bug ID: 141632
           Summary: Rare case profiling should actually work
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

Currently, the "likelyToTakeSlowCaseMinimumCount" threshold is 100, which is larger than the number of times a typical bytecode instruction will execute before being DFG compiled (that threshold averages around 1000/15 ~ 66).  This means that the rare case profiling doesn't actually help us avoid overspeculating.

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