[Webkit-unassigned] [Bug 66426] New: DFG speculative JIT does divide-by-zero checks incorrectly

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=66426

           Summary: DFG speculative JIT does divide-by-zero checks
                    incorrectly
           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 speculative JIT's path for emitting an ArithMod does a divide-by-zero check on a potentially boxed integer by testing the full 64 bit value for zero.  This will always succeed if the value is boxed.

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