[Webkit-unassigned] [Bug 69322] New: DFG should be capable of a broader range of speculations on branch and not

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69322

           Summary: DFG should be capable of a broader range of
                    speculations on branch and not
           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 Branch and LogicalNot nodes may take any JS value.  Currently they are only capable of speculating that the value is a boolean.  But there are cases where these nodes are used for null checks, among other things.  DFG should be able to make the appropriate speculation based on the prediction of the child node.

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