[Webkit-unassigned] [Bug 67176] New: JavaScriptCore does not have tiered compilation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67176

           Summary: JavaScriptCore does not have tiered compilation
           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


JSC does not support the notion of a piece of JS code being recompiled.  This prevents the implementation of a number of interesting features:

1) Profile-driven optimization in DFG JIT.

2) JITing code only after the code is hot.

3) Having a JIT so powerful that it would be prohibitive to run it for every function.

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