From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: New emacs maintainer for cygwin Date: Wed, 20 May 2009 11:22:15 -0400 Message-ID: References: <4A0D7111.7090800@cornell.edu> <83ljoyqwmn.fsf@gnu.org> <4A134CFB.7070403@cornell.edu> <4A136D6F.20903@cornell.edu> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1242832969 17775 80.91.229.12 (20 May 2009 15:22:49 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 20 May 2009 15:22:49 +0000 (UTC) Cc: Eli Zaretskii , emacs-devel@gnu.org To: Ken Brown Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed May 20 17:22:42 2009 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1M6ncu-0001J0-WD for ged-emacs-devel@m.gmane.org; Wed, 20 May 2009 17:22:41 +0200 Original-Received: from localhost ([127.0.0.1]:44904 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1M6ncu-00044g-86 for ged-emacs-devel@m.gmane.org; Wed, 20 May 2009 11:22:40 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1M6nck-00043I-4x for emacs-devel@gnu.org; Wed, 20 May 2009 11:22:30 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1M6ncf-00041C-94 for emacs-devel@gnu.org; Wed, 20 May 2009 11:22:29 -0400 Original-Received: from [199.232.76.173] (port=46780 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1M6ncf-00040x-1m for emacs-devel@gnu.org; Wed, 20 May 2009 11:22:25 -0400 Original-Received: from pruche.dit.umontreal.ca ([132.204.246.22]:51011) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1M6ncc-0006Jh-It; Wed, 20 May 2009 11:22:22 -0400 Original-Received: from faina.iro.umontreal.ca (faina.iro.umontreal.ca [132.204.26.177]) by pruche.dit.umontreal.ca (8.14.1/8.14.1) with ESMTP id n4KFMH4a015895; Wed, 20 May 2009 11:22:17 -0400 Original-Received: by faina.iro.umontreal.ca (Postfix, from userid 20848) id 130E63A183; Wed, 20 May 2009 11:22:15 -0400 (EDT) In-Reply-To: <4A136D6F.20903@cornell.edu> (Ken Brown's message of "Tue, 19 May 2009 22:39:43 -0400") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.93 (gnu/linux) X-NAI-Spam-Score: 0 X-NAI-Spam-Rules: 1 Rules triggered RV3279=0 X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:110998 Archived-At: > Could you elaborate on this? I don't know anything about USE_LSB_TAG. All grep for USE_LSB_TAG in src/lisp.h. It's quite likely that Cygwin uses it already (ideally, all systems should use it). What it does is it makes Emacs use the lower 3bits for tags rather than the higher 3bits. The advantage being that ELisp pointers can reach any part of the memory rather than only the lower 512MB. The downside is that all objects need to be aligned on an 8byte boundary, and on some systems it's difficult to get this guarantee. Stefan