From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id AF4903858D1E; Tue, 14 Feb 2023 14:53:43 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AF4903858D1E DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1676386423; bh=nyDE1tbMoTcjGFcyrsyyfq9CoURiz2Q5KHjm6pvH8dU=; h=From:To:Subject:Date:In-Reply-To:References:From; b=dj7KmM/vwXQfIEe/DIpU7QyTUlZSJU6ClQ/K+NscteVS6yS9oqrX/IfWcMy6ACtdC +0NufEs6rJYnxd05qf3TxdmC68iH/4Qhlb50MRKpzS4/GtpleI3MZ0xX0vvefonqX2 PrWg3cijNtCKbe0H0JHagugoboMC3UtQFs4vsXfg= From: "dcb314 at hotmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/108657] [13 Regression] csmith: possible wrong checksum with -O3 and -ftrivial-auto-var-init=zero Date: Tue, 14 Feb 2023 14:53:42 +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: 13.0 X-Bugzilla-Keywords: needs-bisection, needs-reduction, wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: dcb314 at hotmail dot com 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: 13.0 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: 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: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108657 --- Comment #13 from David Binderman --- I tried adding flag 1 to the run of the two binaries. Here is=20 the bash history: 1003 gcc bug880.c 1004 ./a.out > /tmp/0 1005 ~/gcc/results/bin/gcc -w -O3 -ftrivial-auto-var-init=3Dzero bug880.c= -o b.out 1006 ./b.out > /tmp/1 1007 diff /tmp/0 /tmp/1 1008 ./a.out 1 > /tmp/0 1009 ./b.out 1 > /tmp/1 1010 diff /tmp/0 /tmp/1 and got this: 4,12c4,12 < ...checksum after hashing g_78 : 42AE7A83 < ...checksum after hashing g_86 : EA4E5BB < ...checksum after hashing g_87 : 829B71B1 < ...checksum after hashing g_93 : 454CD723 < ...checksum after hashing g_105 : 589C9AA7 < ...checksum after hashing g_111 : D1C885DD < ...checksum after hashing g_132 : A790B35F < ...checksum after hashing g_133 : A9573918 < ...checksum after hashing g_134[i] : 9B3BD0DE --- > ...checksum after hashing g_78 : 8E047A1D > ...checksum after hashing g_86 : A0CC742A > ...checksum after hashing g_87 : 3BE1496 > ...checksum after hashing g_93 : B496D289 > ...checksum after hashing g_105 : F7D808E0 > ...checksum after hashing g_111 : EC796901 > ...checksum after hashing g_132 : BA05A088 > ...checksum after hashing g_133 : 2662148D > ...checksum after hashing g_134[i] : 3530834A So someplace in g_78 looks to be the culprit.=