[Bug target/90202] AVX-512 instructions not used

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90202

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
IIRC this is a tuning decision made on purpose. If you use just -mavx512f
instead of the -march, you get the code you expected.