[Webkit-unassigned] [Bug 68118] New: DFG should not speculate that the child of LogicalNot is a boolean if predictions tell us otherwise

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68118

           Summary: DFG should not speculate that the child of LogicalNot
                    is a boolean if predictions tell us otherwise
           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 JIT currently speculates that all LogicalNots always operate over booleans even when they clearly don't.  Value profiling can tell us if the input value is not a boolean, and we should take advantage of this information.

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