[Webkit-unassigned] [Bug 160322] Undefined Behavior in JSValue cast from NaN

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160322

--- Comment #10 from Jonathan Bedard <jbedard at apple.com> ---
Investigation of the assembly along with a brief bit of profiling confirms that some versions of clang do not fold away the cast to int check, even though PNaN is a constant.  This may be because PNaN must first be passed through the bitwise_cast function.

In any case, I do think that the changes are worth making both for performance and ambiguity reasons.

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