[Bug target/87561] New: [9 Regression] 416.gamess is slower by ~10% starting from r264866 with -Ofast

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87561

            Bug ID: 87561
           Summary: [9 Regression] 416.gamess is slower by ~10% starting
                    from r264866 with -Ofast
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
            Blocks: 26163
  Target Milestone: ---

It's visible here:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=25.50.0

or here:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=24.50.0

It's slower both for native and generic tuning. Visible on Zen, Kaby Lake and
Haswell CPUs.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)