From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 22450 invoked by alias); 12 Dec 2010 21:03:04 -0000 Received: (qmail 22439 invoked by uid 22791); 12 Dec 2010 21:03:03 -0000 X-SWARE-Spam-Status: No, hits=-2.8 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; Sun, 12 Dec 2010 21:03:00 +0000 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/46899] compiler optimization 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: minor X-Bugzilla-Who: pinskia 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: --- 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: Sun, 12 Dec 2010 21:03:00 -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: 2010-12/txt/msg01324.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46899 --- Comment #6 from Andrew Pinski 2010-12-12 21:02:55 UTC --- >it is undefined at compile time? No, it is undefined at runtime. This again is not an undefined behavior at compile time but rather at runtime. What that means is the behavior cannot be diagnosed (at least by the C standard definitions) at compile time and has to compile. There is no undefined at compile time behavior here, only at runtime.