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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Undefined Behavior in JSValue cast from NaN"
href="https://bugs.webkit.org/show_bug.cgi?id=160322#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Undefined Behavior in JSValue cast from NaN"
href="https://bugs.webkit.org/show_bug.cgi?id=160322">bug 160322</a>
from <span class="vcard"><a class="email" href="mailto:mark.lam@apple.com" title="Mark Lam <mark.lam@apple.com>"> <span class="fn">Mark Lam</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=160322#c2">comment #2</a>)
<span class="quote">> Do we still have an undefined behavior when the passed value just happens to
> be a NaN?
>
> The compiler will not see it and thus won't do anything bad, presumably.</span >
jsNaN() calls JSValue(double), and JSValue(double) casts the double value to an int32_t, which is undefined according to <a href="http://stackoverflow.com/questions/3986795/what-is-the-result-of-casting-float-inf-inf-and-nan-to-integer-in-c">http://stackoverflow.com/questions/3986795/what-is-the-result-of-casting-float-inf-inf-and-nan-to-integer-in-c</a>.</pre>
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