From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 16450 invoked by alias); 15 Dec 2011 13:16:54 -0000 Received: (qmail 16430 invoked by uid 22791); 15 Dec 2011 13:16:53 -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; Thu, 15 Dec 2011 13:16:40 +0000 From: "willus0 at hotmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/51562] Expression evaluation with commas seems incorrect in gcc 4.5.2, 4.4.4 Date: Thu, 15 Dec 2011 13:27:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: willus0 at hotmail dot com X-Bugzilla-Status: RESOLVED 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 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: 2011-12/txt/msg01675.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51562 --- Comment #2 from willus0 at hotmail dot com 2011-12-15 13:16:37 UTC --- (In reply to comment #1) > (x=1,x)+(x=2,x) > > is invoking undefined behavior as there is no sequence point inbetween > the two assignments to x. Is the same also true of the second statement, in which case the Numerical Recipes code is simply poorly written?