From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 4015C385AC29; Wed, 3 Aug 2022 08:41:12 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4015C385AC29 From: "malat at debian dot org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/106322] i386: Wrong code at O2 level (O0 / O1 are working) Date: Wed, 03 Aug 2022 08:41:12 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 12.1.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: malat at debian dot org X-Bugzilla-Status: WAITING 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 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Aug 2022 08:41:12 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106322 --- Comment #11 from Mathieu Malaterre --- (In reply to Uro=C5=A1 Bizjak from comment #10) > The reason the test fails with gcc-12 is that gcc-12 enabled > auto-vectorisation for -O2. I can make the symptoms go away by doing: `-O2 -fno-tree-vectorize`. Since = this affects also arm5 and powerpc, it seems the bug is somewhere in the shared 32bits code (bug does not affects 64bits arch for some reason).=