[Bug target/104610] memcmp () == 0 can be optimized better for avx512f

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104610

--- Comment #19 from Hongtao.liu <crazylht at gmail dot com> ---
I'm wondering would targetm.overlap_op_by_pieces_p helps here.