[Bug target/91634] New: [10 Regression] 508.namd_r (and 435.gromacs) speed regression after r274994

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91634

            Bug ID: 91634
           Summary: [10 Regression] 508.namd_r (and 435.gromacs) speed
                    regression after r274994
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: uros at gcc dot gnu.org
            Blocks: 26163
  Target Milestone: ---
              Host: x86_64-linux-gnu

After the revision I see quite some regressions on -march=skylake:

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=28.447.0&plot.1=7.90.0

Similarly with different tuning options.


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)