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 0ED143858C56; Tue, 26 Mar 2024 12:00:00 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 0ED143858C56
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1711454400;
	bh=hAGkOc013I1fAFMlsimf9wI3mjs4zkrnWeK98DzxLZI=;
	h=From:To:Subject:Date:From;
	b=rM+/MPO0hku3wD2ToL1ftOeM9spfg5K/XXbk0caT0djeG1PgHZhvp3iKXep6q1mZF
	 iyElU5EDiIu0OU4SImOq3qB9+4SFFmLTtuQ/D8OonQJGtO6XEk2rVLmHn0b30Liosq
	 AIpJHOaxQWZ5g29356VMdNWUXQt/NbhrHnV+3VGk=
From: "pheeck at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114481] New: [14 Regression] 14% exec time slowdown of
 433.milc on aarch64
Date: Tue, 26 Mar 2024 11:59:59 +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: missed-optimization, needs-bisection
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pheeck at gcc dot gnu.org
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 blocked
 target_milestone cf_gcchost cf_gcctarget
Message-ID: <bug-114481-4@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=3D114481

            Bug ID: 114481
           Summary: [14 Regression] 14% exec time slowdown of 433.milc on
                    aarch64
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, 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: aarch64-gnu-linux
            Target: aarch64-gnu-linux

As seen here

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=3D686.70.0

between the commits

g:8b483cd5521de79c
g:81ee1298b47d3f3b

there was an 14% runtime slowdown of 433.milc on aarch64. The CPU is Ampere
Altra Neoverse N1. The compilation options were -O2 -flto PGO.

---

Btw here is a plot that also includes GCC13 and GCC12.

https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=3D686.70.0&plot.4=
=3D749.70.0&plot.5=3D869.70.0


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95=
)=