[Webkit-unassigned] [Bug 68977] New: DFG JIT falls back on numerical comparisons when it does not recognize a prediction

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=68977

           Summary: DFG JIT falls back on numerical comparisons when it
                    does not recognize a prediction
           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 will emit numerical comparison code (with numerical speculation) when the operands to the comparison are something that it does not have optimized code generation for.  This means that any code that tries to compare strings, for example, will fall out of the speculative path.

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