[Webkit-unassigned] [Bug 69291] New: DFG backends don't have access to per-node predictions from the propagator

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Oct 3 13:50:46 PDT 2011


https://bugs.webkit.org/show_bug.cgi?id=69291

           Summary: DFG backends don't have access to per-node predictions
                    from the propagator
           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


The DFG propagator has complete knowledge of how each node in the data flow graph is predicted.  But this knowledge is lost when going to the backend.  The backends try to reinfer this, but do so poorly (for example the backend has no idea how to predict a ConvertThis node, while the propagator knows exactly how to predict it).

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