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From: "fkastl at suse dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113832] New: [14 Regression] 6% exec time regression of
 464.h264ref on aarch64
Date: Thu, 08 Feb 2024 15:44:11 +0000
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X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: needs-bisection
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X-Bugzilla-Who: fkastl at suse dot cz
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113832

            Bug ID: 113832
           Summary: [14 Regression] 6% exec time regression of 464.h264ref
                    on aarch64
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: needs-bisection
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fkastl at suse dot cz
  Target Milestone: ---
              Host: aarch64-gnu-linux
            Target: aarch64-gnu-linux

As seen here

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=3D586.220.0

between commits

g:cc7aebff74d89675
g:314cbfe2980b32f5

there is a 6% slowdown of the 464.h264ref 2006 SPEC benchmark. Compiler opt=
ions
are:

-Ofast -march=3Dnative -flto PGO

The CPU is Ampere Altra - Neoverse N1.=