From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: noverlay branch Date: Thu, 06 Oct 2022 08:08:24 -0400 Message-ID: References: <1468ca31-1703-82a1-0c8c-be2c5b5674a7@gmail.com> <87r0zld0de.fsf@rfc20.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="23236"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: Gerd =?windows-1252?Q?M=F6llmann?= , emacs-devel@gnu.org To: Matt Armstrong Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Oct 06 14:46:44 2022 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ogQGy-0005rU-Fl for ged-emacs-devel@m.gmane-mx.org; Thu, 06 Oct 2022 14:46:44 +0200 Original-Received: from localhost ([::1]:39506 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ogQGw-00083D-T4 for ged-emacs-devel@m.gmane-mx.org; Thu, 06 Oct 2022 08:46:42 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48440) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ogPg0-0001iQ-ET for emacs-devel@gnu.org; Thu, 06 Oct 2022 08:08:37 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:3983) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ogPfx-0005mc-Ft for emacs-devel@gnu.org; Thu, 06 Oct 2022 08:08:31 -0400 Original-Received: from pmg2.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id A6825804AB; Thu, 6 Oct 2022 08:08:27 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 30F8880636; Thu, 6 Oct 2022 08:08:26 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1665058106; bh=Ot3E1y63c6fOTn/LBYgngBpKv9aqnJmFScMi0//uqE8=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=I6XRQiFzzq6t5fOedWJiCxQlEcgJXxBdNQ4AkcoHgBK0v/GO/JI2O3c0hfJ/XZIDo JeMkRvUX7byNYZdGC2l8/hnQiwVh9GWCDWMZKJ+Dwwww0wjj9c1bvzNCjlI3v0TKsT BfjbQ8fPxafEEcJJNXz6RebNymrAmT7VQmXXShTWH5eEVyKgGWAl+5AkLCGG1WNgxD GweDmvA7/om10ZZp2Y2QPGhy6GbaBcRKnzj1urFzF8gx/mirMeuJlS79KC4fQfHyw0 Vmd74Y3BnzQp06x9CZIywiOTvxfnxbCd45C77/IvGRzhgUcZh98Dc5YGt7H7WBre1a AXuB6nDOmP1Dg== Original-Received: from pastel (65-110-220-202.cpe.pppoe.ca [65.110.220.202]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 04EB41209CD; Thu, 6 Oct 2022 08:08:25 -0400 (EDT) In-Reply-To: <87r0zld0de.fsf@rfc20.org> (Matt Armstrong's message of "Wed, 05 Oct 2022 21:47:25 -0700") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:297096 Archived-At: > I see you removed some of the null->parent trick just today. I like > that idea. It is realtively easy to use actual NULL instead of a > sentinel NULL in tree algorithms, and I think on modern processors this > works out for the better. The change I made only made it so the sentinel's fields are either read-only or write-only, which means the sentinel is not used to propagate information and is thus not a global state. Whether using NULL is worse or better than using a sentinel, I don't know, and I think the current code is fine in this respect. If someone wants to change it to use NULL, feel free, but it's not on my todo list. Stefan