[Bug tree-optimization/91198] GCC not generating AVX-512 compress/expand instructions

[ams at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91198

--- Comment #1 from Andrew Stubbs <ams at gcc dot gnu.org> ---
I don't believe GCC detects that operation automatically.

It does support the instruction via intrinsics (builtin functions that
correspond to low-level machine features). You should investigate
"__builtin_ia32_compressstoresf512_mask" and friends.