From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 3AA553858013; Wed, 15 Nov 2023 17:10:14 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3AA553858013 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1700068214; bh=46aXww6YlUpU3+gdHMXHp7na3bE4d3npSBFbkrZa7TA=; h=From:To:Subject:Date:In-Reply-To:References:From; b=gOzpY0mLnNgKd0ier5m62kRuDGiZF8JMBePFw96YW2YqI9EOWCZFXy5YvpYA2gSdr 0hlo20aA58iu9p86y+J4W2Y0L7ud4M4Vfc+FN1xtKn+wn5/7wLzcgfjNLd8zaoyoxU q5ICJd0u2DNQaiHs2zGNBgYTjmkTHU/4DwCk2oCc= From: "dcb314 at hotmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/112550] Difference in output from -O0 to -01 ? Date: Wed, 15 Nov 2023 17:10:13 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: 14.0 X-Bugzilla-Keywords: 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: --- 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=3D112550 --- Comment #3 from David Binderman --- >From a valgrind run: =3D=3D4110530=3D=3D Use of uninitialised value of size 8 =3D=3D4110530=3D=3D at 0x401145: crc32_byte (csmith.h:73) =3D=3D4110530=3D=3D by 0x401167: crc32_8bytes (csmith.h:99) =3D=3D4110530=3D=3D by 0x401167: transparent_crc (csmith.h:112) =3D=3D4110530=3D=3D by 0x401640: main (in.18229.c:890) I should have thought of valgrind earlier. Sorry.=