[Bug target/115842] New: [15 Regression] 6.5% slowdown of 548.exchange2_r on Intel Ice Lake

[pheeck at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115842

            Bug ID: 115842
           Summary: [15 Regression] 6.5% slowdown of 548.exchange2_r on
                    Intel Ice Lake
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: 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=795.407.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=794.407.0

there was a 6.5% exec time slowdown of the 548.exchange2_r SPEC 2017 benchmark
between commits

r15-1557-g69fdcd0c57c761
r15-1712-g5612541834c063

when run with -O2 -march=native on an Intel Ice Lake (3rd generation Xeon)
machine.


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)