[Bug tree-optimization/116415] [13 Regression][PPC64LE] atomics wrongly use vector instructions in DWCAS.

[bergner at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116415

Peter Bergner <bergner at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |12.0, 13.0, 14.0, 15.0
   Last reconfirmed|                            |2024-08-19
             Target|                            |powerpc64le-linux
      Known to work|                            |11.0
     Ever confirmed|0                           |1

--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
Confirmed.  I see this working on gcc11 and fails for gcc12 and later.  This
also requires -mcpu=power8.  It passes with -mcpu={power9,10}.

I suspect that this related to our Power8 swap optimization pass.