From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 87111 invoked by alias); 6 Jul 2015 16:16:05 -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 87059 invoked by uid 48); 6 Jul 2015 16:16:00 -0000 From: "amacleod at redhat dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/59767] __atomic_load_n with __ATOMIC_SEQ_CST should result in a memory barrier Date: Mon, 06 Jul 2015 16:16:00 -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: 4.8.2 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: amacleod at redhat 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: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-07/txt/msg00473.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59767 --- Comment #4 from Andrew Macleod --- I'm not sure where the problem is. We interacted quite a bit as the model was being developed. As I recall, it started with the standard, but they strengthened some of the problem spots for a complete testable model. To the best of my knowledge, this is the most efficient implementation that we *know* to be safe, and that is why we implement it.