[Webkit-unassigned] [Bug 69565] New: JavaScript tests should have coverage for corner cases of DFG speculation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=69565

           Summary: JavaScript tests should have coverage for corner cases
                    of DFG speculation
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


The JavaScriptCore DFG JIT compiler likes to speculate on a lot of fast cases of JavaScript execution, like that integer additions don't overflow, bitwise operations don't create numbers that are not representable using signed 32-bit integers, etc.  We only have limited test coverage for these cases, and that should be fixed.

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