From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 852263858C36; Fri,  8 Dec 2023 07:38:21 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 852263858C36
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1702021101;
	bh=Y/B4CQc02BH/UQ57stK8jCKESQX0Zhwe7Wst5Opdmdk=;
	h=From:To:Subject:Date:From;
	b=fTss5FNdFHSjXe39o3UNUc3F8YwhHc81hcjHiaXVQDKiei/pr1iTZXBHdVD1J1Fcx
	 vg9lcQqWCjWP8zhetzdF5vlthgV+tEFn2iBXL7wVWP19I6JjsqtRo1OpUv2drlcTWh
	 AFdfL4IIlqgWr+ULfPjUhMzaOA/zRjs8ozZgdC/g=
From: "fkastl at suse dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/112915] New: [14 Regression] ~4-11% exec time regression
 of 454.calculix on AMD Zen2
Date: Fri, 08 Dec 2023 07:38:21 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: needs-bisection
X-Bugzilla-Severity: normal
X-Bugzilla-Who: fkastl at suse dot cz
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status
 keywords bug_severity priority component assigned_to reporter
 target_milestone cf_gcchost cf_gcctarget
Message-ID: <bug-112915-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112915

            Bug ID: 112915
           Summary: [14 Regression] ~4-11% exec time regression of
                    454.calculix on AMD Zen2
           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: x86_64-linux
            Target: x86_64-linux

Between commits

g:cff1fa6625d1273f

and

g:8b9d0e8cf482287b

there's a slowdown of 454.calculix 2006 SPEC. 11% regression seen on the gr=
aph
here (Zen2 machine):

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=3D288.170.0

I've also replicated this on another Zen2 machine and got 4% slowdown. I
haven't seen this slowdown on other architectures.=