[Bug rtl-optimization/93564] New: [10 Regression] 470.lbm regresses by 25% on znver2 with -Ofast -march=native LTO and PGO since r10-6384-g2a07345c4f8dabc2

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93564

            Bug ID: 93564
           Summary: [10 Regression] 470.lbm regresses by 25% on znver2
                    with -Ofast -march=native LTO and PGO since
                    r10-6384-g2a07345c4f8dabc2
           Product: gcc
           Version: 9.2.1
            Status: UNCONFIRMED
          Keywords: ra
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: vmakarov at gcc dot gnu.org
  Target Milestone: ---

Since the revision I see quite big slow down:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=288.240.0

and I see a smaller slow down on different configurations:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=10.477.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=297.477.0