[Webkit-unassigned] [Bug 64147] New: DFG JIT does not implement prototype chain or list caching for get_by_id

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64147

           Summary: DFG JIT does not implement prototype chain or list
                    caching for get_by_id
           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 JIT supports caching of prototype lists (if a get_by_id access may hit one of several prototypes) and chains (if a get_by_id access may hit a prototype at any depth in the prototype chain), as well as prototype chain lists (if a get_by_id access may hit one of several prototypes at varying depths in the prototype chain).  The DFG JIT supports prototype caching only, but should support prototype lists, chains, and chain lists to ensure good performance.

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