https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112449
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- And documented other parts here: https://gcc.gnu.org/onlinedocs/gcc-13.2.0/cpp/Common-Predefined-Macros.html specifically: It does not indicate whether optimizations respect signaling NaN semantics (the macro for that is __SUPPORT_SNAN__).
