[Bug target/112992] Inefficient vector initialization using vec_duplicate/broadcast

[liuhongt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112992

--- Comment #6 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
> Thoughts?  Apologies if this is a dup.  I'm happy to work up a patch if
> someone could advise on where best this should be fixed.  Perhaps RTL's
> vec_duplicate could be canonicalized to the most appropriate vector mode?
That may breaks avx512 embedded broadcast.