[Bug tree-optimization/122777] [16 Regression] 5-8% slowdown of 454.calculix and 548.exchange2_r on AMD Zen{4,5} since r16-5258-g1d8e2d51e5c5cb

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122777

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[16 Regression] 5-7%        |[16 Regression] 5-8%
                   |slowdown of 454.calculix on |slowdown of 454.calculix
                   |AMD Zen{4,5} since          |and 548.exchange2_r on AMD
                   |r16-5258-g1d8e2d51e5c5cb    |Zen{4,5} since
                   |                            |r16-5258-g1d8e2d51e5c5cb

--- Comment #1 from Filip Kastl <pheeck at gcc dot gnu.org> ---
Also, I've bisected this to the same commit:

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=1249.407.0

That's an 8% slowdown of 548.exchange2_r SPEC 2017 benchmark when compiled with
-O2 -march=x86-64-v3 -flto on AMD Zen5.