[Webkit-unassigned] [Bug 65954] New: DFG JIT heap prediction causes regressions when combined with aggressive integer prediction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=65954

           Summary: DFG JIT heap prediction causes regressions when
                    combined with aggressive integer prediction
           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


Both of these patches produced speed-ups by themselves:

https://bugs.webkit.org/show_bug.cgi?id=65883
https://bugs.webkit.org/show_bug.cgi?id=65949

But when combined, they produce slow-downs.  Because the latter one was a bigger speed-up, the former should probably be disabled until the reasons behind the regressions are better understood.

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