[Webkit-unassigned] [Bug 64493] New: GC allocation fast path has too many operations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64493

           Summary: GC allocation fast path has too many operations
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


The JSC GC allocates objects by looping starting at the current block, and the current atom in the block, and proceeds until it finds a free atom, which it then destroys.  This allocation path is both expensive and difficult to inline.  The JSC GC should have an allocation fast path that (1) is fast and simple, (2) covers the great majority of cases, and (3) is complemented by a reasonably fast slow path.

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