[Bug middle-end/110757] New: 7% parest regression on zen3 -Ofast -march=native -flto between g:4dbb3af1efe55174 (2023-07-14 00:54) and g:a5088dc3f5ef73c8 (2023-07-17 03:24)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110757

            Bug ID: 110757
           Summary: 7% parest regression on zen3 -Ofast -march=native
                    -flto between g:4dbb3af1efe55174 (2023-07-14 00:54)
                    and g:a5088dc3f5ef73c8 (2023-07-17 03:24)
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hubicka at gcc dot gnu.org
  Target Milestone: ---

seems there are two commits producing this regression. Run in between is
d76d19c9bc5ef113 (2023-07-16 00:16)

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=475.457.0

There are earlier two jumps between g:52577a301ef1b86d (2023-05-30 02:20) and
g:d0c064c3eabc75cf (2023-05-31 16:46)
and between g:7ebd4a1d61993c0a (2023-04-28 07:23) and g:977a3be3ccbc7f17
(2023-05-01 13:40)

8% regression is also seen on zen1 machine:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=287.457.0