[Bug rtl-optimization/56766] Fails to combine (vec_select (vec_concat ...)) to (vec_merge ...)

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56766

--- Comment #16 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Richard Biener from comment #8)
> No.

[...]

> That was why I was suggesting to add additional patterns rather than
> replacing the existing ones...

So, there is no other way than using "the ugly" patch that adds missing
patterns.

Please try the patch, attached in the message above.