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 8E4313857B82; Wed, 13 Mar 2024 14:01:58 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8E4313857B82
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1710338518;
	bh=FhDw3Ud2a3k65JtYzHwP7qBYusK4cs1qpt2qhMs3ZxA=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=snRM3Nk8a57wXlm9ovT7Ta16KtwXNa+VJYvZI1VSqgssUbkfARipOT5bd0D0mFTD0
	 pPhca3Z7G2s1NkcwVXA5iV3iAhAFuv3lawL4fo5TGcMyYTtN8fqXjXyyK3YsH7ALPc
	 oZXTSXzraXre92pxTKwlEZNsTSaeA2huk++voYUg=
From: "qinzhao at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/111523] Unexpected performance regression with
 -ftrivial-auto-var-init=zero for e.g. systemctl unmask
Date: Wed, 13 Mar 2024 14:01:56 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 12.2.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: qinzhao at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: MOVED
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: 
Message-ID: <bug-111523-4-ibXNwIXJX9@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-111523-4@http.gcc.gnu.org/bugzilla/>
References: <bug-111523-4@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=3D111523

--- Comment #10 from qinzhao at gcc dot gnu.org ---
(In reply to Andrew Pinski from comment #9)

> Anways systemd has now changed the buffer to 256 which is much much small=
er
> and for most calls enough in size before needing to reallocate the buffer
> that it has now become fast.
>=20
> Anyways -ftrivial-auto-var-init=3Dzero just exposed a performance (stack =
size)
> issue with already existing issue inside the systemd code. A good thing
> really.=20
>=20
> So closing as moved.

thanks a lot for the analysis and the solution of this performance issue.
really appreciate.=