https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103406
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> --- gcc/libgcc/config/i386/sfp-machine.h says: /* Here is something Intel misdesigned: the specs don't define the case where we have two NaNs with same mantissas, but different sign. Different operations pick up different NaNs. */
