[Bug rtl-optimization/104049] [12 Regression] vec_select to subreg lowering causes superfluous moves

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104049

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-01-17
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=104039
   Target Milestone|---                         |12.0
     Ever confirmed|0                           |1
           Keywords|                            |ra

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This might be the same issue as PR 104039 really, though there we have a
paradoxical subreg.

The problem is the register allocator really really does not handle subreg in a
decent way.