https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113576
--- Comment #51 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
>From the -mavx* options I think -march=skylake-avx512 implies
-mavx512{f,cd,vl,bw,dq} but -mavx512f is implied by any of the latter 4.
