[Webkit-unassigned] [Bug 67920] New: JavaScriptCore does not have baseline->speculative OSR

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67920

           Summary: JavaScriptCore does not have baseline->speculative OSR
           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


Tiered compilation in JavaScriptCore only produces a benefit if the code being optimized does most of its work in functions that get called repeatedly.  Hot loops in functions that don't return for a long time continue to execute old JIT code.  Fixing that requires on-stack-replacement from baseline (old JIT) code to speculative (DFG JIT) code.

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