From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#18995: Error: Could not reserve dynamic heap area. Date: Sun, 09 Nov 2014 19:14:58 +0200 Message-ID: <831tpcpa7h.fsf@gnu.org> References: <834mu9r47v.fsf@gnu.org> <83y4rlpmsr.fsf@gnu.org> <83wq75plkm.fsf@gnu.org> <83vbmppj4a.fsf@gnu.org> <83r3xdpiex.fsf@gnu.org> <545E81BD.8070904@dancol.org> <83egtcpd3z.fsf@gnu.org> <87r3xcqqlp.fsf@igel.home> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1415553396 8742 80.91.229.3 (9 Nov 2014 17:16:36 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 9 Nov 2014 17:16:36 +0000 (UTC) Cc: 18995@debbugs.gnu.org, haroogan@gmail.com To: Andreas Schwab Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Nov 09 18:16:29 2014 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1XnW6A-0000EU-Gg for geb-bug-gnu-emacs@m.gmane.org; Sun, 09 Nov 2014 18:16:22 +0100 Original-Received: from localhost ([::1]:39479 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XnW6A-0002Ra-0w for geb-bug-gnu-emacs@m.gmane.org; Sun, 09 Nov 2014 12:16:22 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:58774) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XnW61-0002Q6-FC for bug-gnu-emacs@gnu.org; Sun, 09 Nov 2014 12:16:19 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XnW5r-0005bT-6i for bug-gnu-emacs@gnu.org; Sun, 09 Nov 2014 12:16:13 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:57821) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XnW5r-0005bO-2W for bug-gnu-emacs@gnu.org; Sun, 09 Nov 2014 12:16:03 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.80) (envelope-from ) id 1XnW5q-0003lQ-Gx for bug-gnu-emacs@gnu.org; Sun, 09 Nov 2014 12:16:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 09 Nov 2014 17:16:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 18995 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 18995-submit@debbugs.gnu.org id=B18995.141555331914404 (code B ref 18995); Sun, 09 Nov 2014 17:16:02 +0000 Original-Received: (at 18995) by debbugs.gnu.org; 9 Nov 2014 17:15:19 +0000 Original-Received: from localhost ([127.0.0.1]:55034 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XnW54-0003kB-Uq for submit@debbugs.gnu.org; Sun, 09 Nov 2014 12:15:18 -0500 Original-Received: from mtaout22.012.net.il ([80.179.55.172]:53657) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from ) id 1XnW52-0003k2-G7 for 18995@debbugs.gnu.org; Sun, 09 Nov 2014 12:15:13 -0500 Original-Received: from conversion-daemon.a-mtaout22.012.net.il by a-mtaout22.012.net.il (HyperSendmail v2007.08) id <0NES00I007SFQR00@a-mtaout22.012.net.il> for 18995@debbugs.gnu.org; Sun, 09 Nov 2014 19:15:11 +0200 (IST) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout22.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0NES00IUD7XAHZ40@a-mtaout22.012.net.il>; Sun, 09 Nov 2014 19:15:11 +0200 (IST) In-reply-to: <87r3xcqqlp.fsf@igel.home> X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:95781 > From: Andreas Schwab > Cc: eliz@gnu.org, haroogan@gmail.com > Date: Sun, 09 Nov 2014 17:35:30 +0100 > > Eli Zaretskii writes: > > > It looked like a GCC bug at first, but as I tried to modify the source > > and look at the effect of that on the generated code, it finally > > dawned on me: GCC's loop-unrolling code simply correctly calculated > > that with the initial value of 0x68000000 and decrement of 0x00800000, > > the value of 'size' in the loop will never be less than 0x00100000, > > due to wraparound in the subtraction of unsigned values. > > Before wraping around, size will become zero, which is definitely less > than 0x00100000. Right, so it could be pure GCC bug after all. For the record, the problem also goes away if 'size' is declared ptrdiff_t, and nothing else is changed. So whatever the reason, it definitely is somehow related to unsigned arithmetics.