https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82153
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> --- convert_to_integer_1 in convert.cc has some optmiizations which are missing in match.pd . /* Convert e.g. (long)round(d) -> lround(d). */ /* Convert (int)logb(d) -> ilogb(d). */