https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112806
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- [[likely]]/__builtin_expect is kinda of documented: https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/Other-Builtins.html#index-fprofile-arcs-1 Everything else is just a hint.
