[Webkit-unassigned] [Bug 142686] New: Object allocation sinking phase shouldn't re-decorate previously sunken allocations on each fixpoint operation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142686

            Bug ID: 142686
           Summary: Object allocation sinking phase shouldn't re-decorate
                    previously sunken allocations on each fixpoint
                    operation
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

When you run the elidable-new-object-roflcopter test, you'll see that there are many repeated PutStructureHints and PutByOffsetHints.  These are because we handle already-sunken allocations from previous fixpoint iterations inside the code for handling those allocations we are sinking on *this* fixpoint iteration.  This is a mostly benign bug; its main effect is that if the phase does many fixpoint iterations then you'll get a lot of duplicated code.

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