From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 23227 invoked by alias); 15 Oct 2010 05:54:36 -0000 Received: (qmail 23215 invoked by uid 22791); 15 Oct 2010 05:54:35 -0000 X-SWARE-Spam-Status: No, hits=-2.4 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,MISSING_MID X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 15 Oct 2010 05:54:30 +0000 From: "justin.lebar+bug at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug web/46031] Atomic Builtins page should indicate that 16-byte compare-and-swap is available with -mcex16 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: web X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: justin.lebar+bug at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Fri, 15 Oct 2010 05:54:00 -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 X-SW-Source: 2010-10/txt/msg01266.txt.bz2 Message-ID: <20101015055400.fkV75GzgkMrUDv8mew9TLZG1GA7SRLW_c6spLqKDyBY@z> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46031 --- Comment #4 from Justin Lebar 2010-10-15 05:54:28 UTC --- > Actually it says the target processors might not include all of the builtins. Maybe I'm not making sense. My point is that there's a builtin (*) that is supported by some target processors but is not listed in the manual. So the statement that some target processors might not include all the builtins isn't helpful. * The builtin is compare_and_swap with 16-byte operands. The manual explicitly says "GCC will allow any integral scalar or pointer type that is 1, 2, 4 or 8 bytes in length" but should indicate that 16-byte operands are supported for compare_and_swap, at least under some circumstances.