https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128111
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- wi::clmul has to handle arbitrary precisions and __builtin_clmulg for its implementation is not a good fit, that can be used say to handle a single limb case, (or some other particular type), but it would be only useful if it used some recursive algorithm.
