[Bug target/121994] [16 Regression] 15% slowdown of 538.imagick_r and 6% slowdown of 454.calculix on AMD Zen2 since r16-3396-g9823624395a946

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121994

Filip Kastl <pheeck at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[16 Regression] 15%         |[16 Regression] 15%
                   |slowdown of 538.imagick_r   |slowdown of 538.imagick_r
                   |on AMD Zen2 since           |and 6% slowdown of
                   |r16-3396-g9823624395a946    |454.calculix on AMD Zen2
                   |                            |since
                   |                            |r16-3396-g9823624395a946

--- Comment #1 from Filip Kastl <pheeck at gcc dot gnu.org> ---
I've also just found a 6% slowdown of 454.calculix SPEC 2006 benchmark.  It
also bisects to r16-3396 and also happens with -Ofast -march=native -flto on
AMD Zen2 machines.

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=289.170.0