[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 #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Mario Hros from comment #4)
> 
> This bug report is about the strange behavior where GCC doesn't seem to be
> using result of the fmod@plt at all. Or am I missing something?

Yes you are missing the fmod function will set errno on error. If you don't
want to depend on that behavior use -fno-math-errno .