[Webkit-unassigned] [Bug 20821] New: Cache property transitions to speed up object initialization

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=20821

           Summary: Cache property transitions to speed up object
                    initialization
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mjs at apple.com


EarlyBoyer spends 16.6% of its time in cti_op_put_by_id_generic, much of it
under StructureID::addPropertyTransition. A lot of this time could be removed
by inline caching property transitions - the old structure ID, the new
structureID, and the offset to write to (and a call to resize if needed).
DeltaBlue is also somewhat affected (3.6% in put_by_id_generic) as is Raytrace,
though in the case of RayTrace much of the badness could just be due to
Arguments not being very clever.

See bug 20813.


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