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

[hjl.tools at gmail dot com via Gcc-bugs]

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

--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Filip Kastl from comment #8)
> 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

Can you extra a small testcase to show the issue?