[Webkit-unassigned] [Bug 69235] New: DFG should speculate more aggressively on obvious cases on polymorphic get_by_id

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69235

           Summary: DFG should speculate more aggressively on obvious
                    cases on polymorphic get_by_id
           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


Many get_by_id's that go polymorphic in V8 end up performing accesses at one offset regardless of the structure.  In those cases, we can still use GetByOffset and CheckStructure, so long as CheckStructure is extended to be able to check multiple structures.

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