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From: "fkastl at suse dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/112548] New: 5% exec time regression in 429.mcf on AMD
 zen4 CPU
Date: Wed, 15 Nov 2023 15:07:31 +0000
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X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112548

            Bug ID: 112548
           Summary: 5% exec time regression in 429.mcf 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=3D991.60.0

between commits

g:4ea36076d66eea0f (2023-11-02 02:54)

and

g:c3847ca0571e5ace (2023-11-03 03:35)

there's about 5% slowdown.

The test is compiled with -Ofast -march=3Dnative -mtune=3Dnative lto and pg=
o. It is
run on an amd zen4 machine.=