[Bug target/120941] [16 Regression] 24-40% slowdown of 519.lbm_r on Zen2 and 470.lbm on Zen5 since r16-1644-gaba3b9d3a48a07

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120941

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[16 Regression] 24-40%      |[16 Regression] 24-40%
                   |slowdown of 519.lbm_r on    |slowdown of 519.lbm_r on
                   |Zen2 since                  |Zen2 and 470.lbm on Zen5
                   |r16-1644-gaba3b9d3a48a07    |since
                   |                            |r16-1644-gaba3b9d3a48a07

--- Comment #8 from Filip Kastl <pheeck at gcc dot gnu.org> ---
The same commit (r16-1644-gaba3b9d3a48a07) causes ~20% slowdown of 470lbm from
2006 SPEC on Zen5 with -Ofast -march=native -flto -fprofile-use.

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=1283.240.0