[Bug target/119927] New: 5% slowdown of 415.gamess on Intel Ice Lake

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119927

            Bug ID: 119927
           Summary: 5% slowdown of 415.gamess on Intel Ice Lake
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, needs-bisection
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pheeck at gcc dot gnu.org
            Blocks: 26163
  Target Milestone: ---
              Host: x86_64-linux
            Target: x86_64-linux

As seen here

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=790.50.0

there was a 5% exec time slowdown of the 416.gamess SPEC 2006 benchmark between
commits

r15-9236-gb39d5fad621c25
r15-9392-g711c10383f494b

when run with -Ofast -march=native -flto on an Intel Ice Lake (3rd generation
Xeon) machine.

Not sure if this is a regression against GCC 14.  See comparison here:

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.4=1090.50.0&plot.6=790.50.0&;


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)