https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117641
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- sync_resolve_size should have returned -1 due to this: if (size == 16 && fetch && !orig_format && TREE_CODE (type) == BITINT_TYPE && !targetm.scalar_mode_supported_p (TImode)) return -1;