[Webkit-unassigned] [Bug 67985] New: SpeculativeJIT::shouldSpeculateInteger(NodeIndex, NodeIndex) should return false if either node can be double

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Sep 12 22:28:53 PDT 2011


https://bugs.webkit.org/show_bug.cgi?id=67985

           Summary: SpeculativeJIT::shouldSpeculateInteger(NodeIndex,
                    NodeIndex) should return false if either node can be
                    double
           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


SpeculativeJIT::shouldSpeculateInteger(NodeIndex, NodeIndex) currently returns false if either child node's prediction or static type is double.  But that ignores cases where the prediction says that a node can be double, but is not necessarily always double.  This is responsible for 3d-cube always failing speculation.

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