[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 #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 35753
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35753&action=edit
Patch to implement ADDSUB patterns using vec_select/vec_concat