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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/102758] [12 Regression] Failure to use registers
 optimally with return values (2 operands related)
Date: Fri, 15 Oct 2021 02:30:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102758

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2021-10-15
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |11.2.0
   Target Milestone|---                         |12.0
            Summary|[x86] Failure to use        |[12 Regression] Failure to
                   |registers optimally when    |use registers optimally
                   |swapping between            |with return values (2
                   |(identically represented)   |operands related)
                   |vector types                |
      Known to fail|                            |12.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC 11.2.0 (and before) produces:
        movdqa  .LC0(%rip), %xmm0
        paddw   %xmm1, %xmm0
        ret

Which is what you want.
I don't know why trunk changed ...=