https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88035
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I must say I don't understand the #c1 comment, GCC __builtin_ia32_reducepd512_mask etc. don't take the rounding mode argument at all. And not only the _mm_*reduce_round* intrinsics are missing, _mm512_*reduce_round* is missing too.
