[Webkit-unassigned] [Bug 198253] New: [JSC] ResultType implementation is wrong for bit ops, and ends up making ArithDiv in DFG Int32 fast path even if Baseline constantly produces Double result

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198253

            Bug ID: 198253
           Summary: [JSC] ResultType implementation is wrong for bit ops,
                    and ends up making ArithDiv in DFG Int32 fast path
                    even if Baseline constantly produces Double result
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ysuzuki at apple.com

It causes unnecessary OSRExit in async-fs Math.random code.

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