[Webkit-unassigned] [Bug 145366] FTL is not working on Windows.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145366

Basile Clement <basile_clement at apple.com> changed:

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                 CC|                            |basile_clement at apple.com

--- Comment #31 from Basile Clement <basile_clement at apple.com> ---
If MSVC runtime says sin(-0) = 0, this is incorrect (standard enforces sin(-0) = -0).
According to http://stackoverflow.com/questions/30392832/sinminus-zero-does-not-return-the-expected-result-on-visual-studio-2013-64bi , this is the case at least for MSVC 2013 on Windows 7. Is this the MSVC/Windows version combination you are using? Can you confirm it is a runtime problem with a simple C program computing sin(-0)?

(In reply to comment #30)
> (In reply to comment #29)
> > 
> > Looks like the default rounding mode is fine.  If your only failure is
> > sin(-0), I'd look at that path and see if there is some windows specific
> > handling of sin that is causing the issue.
> 
> Yes, the only failure is sin(-0) (which also fails with FTL disabled).
> I investigated the path, and found nothing Windows specific, except for the
> sin() call itself from the function mathProtoFuncSin().
> This makes me think that the issue is caused by differences in the MSVC and
> GCC C run time libraries.

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