[Bug tree-optimization/103227] New: 58% exchange2 regression with -Ofast -march=native on zen3 between g:1ae8edf5f73ca5c3 and g:2af63f0f53a12a72

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103227

            Bug ID: 103227
           Summary: 58% exchange2 regression with -Ofast -march=native on
                    zen3 between g:1ae8edf5f73ca5c3 and g:2af63f0f53a12a72
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org
  Target Milestone: ---

This is seen here:

https://lnt.opensuse.org/db_default/v4/SPEC/graph?highlight_run=21414&plot.0=475.407.0

There is also a large binary growth, so it seems to not be a noise.

https://lnt.opensuse.org/db_default/v4/SPEC/graph?highlight_run=21414&plot.0=475.401.4

Quite possibly related to this weekend modref and/or ipa-sra changes enabling
more transforms.