From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 93307 invoked by alias); 27 Mar 2015 18:31:28 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 92627 invoked by uid 48); 27 Mar 2015 18:31:19 -0000 From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/65147] alignment of std::atomic object is not correct Date: Fri, 27 Mar 2015 19:15:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Version: 4.9.2 X-Bugzilla-Keywords: ABI X-Bugzilla-Severity: normal X-Bugzilla-Who: redi at gcc dot gnu.org X-Bugzilla-Status: RESOLVED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 5.0 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-03/txt/msg03240.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65147 --- Comment #8 from Jonathan Wakely --- (In reply to Alexey Lapshin from comment #7) > It looks like this fix makes alignment of atomic object to be the same as > alignment of integral non-atomic object of the same size. That was the intention, yes. Because I understood that to be what _Atomic does. > The gcc behavior is different it makes alignment of atomic objects of sizes > 1,2,4,8,16 to match with size : Oh.