From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 26981 invoked by alias); 24 Mar 2012 08:07:30 -0000 Received: (qmail 26972 invoked by uid 22791); 24 Mar 2012 08:07:29 -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; Sat, 24 Mar 2012 08:07:16 +0000 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/52699] infinite loop generated with -O0 Date: Sat, 24 Mar 2012 08:42:00 -0000 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: normal X-Bugzilla-Who: pinskia at gcc dot gnu.org 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: Component 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: 2012-03/txt/msg02107.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52699 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Component|target |libstdc++ --- Comment #5 from Andrew Pinski 2012-03-24 08:06:58 UTC --- >>From the looks of it, it looks more like a source (library) issue rather than a compiler one. Though I don't know enough of this code to say that. We are stuck in the following loop: 754 result_type __u; 755 do 756 __u = _M_b() - _M_b.min(); 757 while (__u >= __y0); __y0 is 0 which means the loop is always true.