From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 24632 invoked by alias); 2 Mar 2011 23:21:19 -0000 Received: (qmail 24622 invoked by uid 22791); 2 Mar 2011 23:21:18 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 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; Wed, 02 Mar 2011 23:21:12 +0000 From: "paolo.carlini at oracle dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/47913] [C++0x] improve ratio_add to overflow less often X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement X-Bugzilla-Who: paolo.carlini at oracle 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: Message-ID: 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: Wed, 02 Mar 2011 23:21:00 -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: 2011-03/txt/msg00248.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47913 --- Comment #18 from Paolo Carlini 2011-03-02 23:21:07 UTC --- (In reply to comment #17) > Some more examples. Using the constants: > m=INTMAX_MAX; > n=INTMAX_MAX/2; > p=((intmax_t)1<<(4*sizeof(intmax_t)-1))-3 > > (m,2)-(m,3)==(m,6) boost should manage this one I'm not sure to understand, I was under the impression that right now GCC is essentially equal to boost::rational?!?