[Bug middle-end/100267] gcc -O2 for avx512 instrincts generates extra warnings and less optimizations

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100267

--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Hongtao.liu from comment #3)
> After support v{,p}expand* thats w/o mask operands, codegen seems to be
> optimal
> 

I was wrong, without mask, it's just simple move.