From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 119EB385DC0C; Tue, 16 Nov 2021 10:03:13 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 119EB385DC0C From: "hubicka at kam dot mff.cuni.cz" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/103266] [12 regression] llvm-13 miscompilation: __builtin_assume_aligned causes over-aggressive dce Date: Tue, 16 Nov 2021 10:03:12 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: hubicka at kam dot mff.cuni.cz X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: hubicka at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.0 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 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: Tue, 16 Nov 2021 10:03:13 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103266 --- Comment #5 from hubicka at kam dot mff.cuni.cz --- > I think 'X' means simply not dereferenced or escaping since this was all > PTA based. 'S' would still eventually allow escaping. But yes, PTA > simply takes '1' literally. So the patch below is IMHO too pessimizing. > Can you please fixup modref instead? If X is not meant to be "completely unused" (that is bit useless for anotating bulitins I think since most of them shoul dbe sane) but all the other flags together, we should update docs and eaf_flags production which would fix the issue too.=