[Bug target/112547] New: 9% exec time regression of 462.libquantum SPEC on AMD zen4 CPU

[fkastl at suse dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112547

            Bug ID: 112547
           Summary: 9% exec time regression of 462.libquantum SPEC on AMD
                    zen4 CPU
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fkastl at suse dot cz
  Target Milestone: ---
              Host: x86_64-linux
            Target: x86_64-linux

As seen here

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=956.210.0

between commits

g:53010f6ff6dfbf7b (2023-11-05 02:42)

and

g:1a55724f7870719d (2023-11-06 02:27)

there is about 9% slowdown of execution time of the 2006SPEC 462.libquantum.

The test is run with -O2 and lto on an amd zen4 machine.