[Bug target/93720] [10 Regression] vector creation from two parts of two vectors produces TBL rather than ins

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93720

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-02-16
     Ever confirmed|0                           |1

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Dmitrij Pochepko from comment #2) 
> It looks like peephole2 can be used to optimize it. I'm currently looking
> into in.

Don't.  Can you attach your current patch?  
My bet is you expand this vec_perm like:
(set (reg:V2DF t1) (reg:V2DF low))
(set (reg:V2DF t) (vec_merge:V2DF
                   (vec_duplicate:V2DF
                    (vec_select:DF (reg:V2DF high)
                     (parallel [(const_int 2)])))
                  (reg:V2DF t1)
                  (const_int 2)))

Since it is only two elements.