[Bug c/115374] fmod() in x86_64 -O3 not using return value from the glibc's implementation if x87 FPU fprem returns NaN

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115374

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
And for mmx code, you can't combine it in a nice way without using EMMS.

So it might be a bug in the code you are testing with.