[Bug middle-end/106819] [13 Regression] NaN != NaN comparisons return false at -O2 since r13-2338

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106819

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
You can get a NaN with negative sign e.g. through copysign (__builtin_nan (""),
-1.0).