[Bug tree-optimization/104058] New: [12 Regression] 6-7% x264_r regression with -march=native -Ofast -funroll-loops -flto on x86 since r12-6420-gd3ff7420e941931d32ce2e332e7968fe67ba20af

[admin at levyhsu dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104058

            Bug ID: 104058
           Summary: [12 Regression] 6-7% x264_r regression with
                    -march=native -Ofast -funroll-loops -flto on x86 since
                    r12-6420-gd3ff7420e941931d32ce2e332e7968fe67ba20af
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: admin at levyhsu dot com
  Target Milestone: ---

We observed regression on 525.x264_r with commit
d3ff7420e941931d32ce2e332e7968fe67ba20af

On IceLake(8358):
-7.27%

On Zen3(7763):
-6.67%

On Zen3(5800x):
-6.45%

The regression on Zen 3 can also be found in
https://lnt.opensuse.org/db_default/v4/SPEC/graph?highlight_run=22984&plot.0=475.377.0