[Bug target/112879] New: [14 Regression] 4% exec time regression of 525.x264_r on AMD Zen4

[fkastl at suse dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112879

            Bug ID: 112879
           Summary: [14 Regression] 4% exec time regression of 525.x264_r
                    on AMD Zen4
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: needs-bisection
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fkastl at suse dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

There's a 4% slowdown of 525.x264_r on AMD Zen4 between commits

g:af7fa3135b6b046f

g:e85c596ae2d1e5f5

Here is a plot showing this regression:

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=958.377.0

I've seen this regression on two different Zen4 machines but haven't observed
it on machines with different architecture.