From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: Making 'eq' == 'eql' in bignum branch Date: Sun, 19 Aug 2018 18:33:47 -0700 Organization: UCLA Computer Science Department Message-ID: <583514c3-956c-80c3-12b2-69e67bfe2bde@cs.ucla.edu> References: <29f933ac-a6bf-8742-66a7-0a9d6d3e5a88@disroot.org> <0d3175d8-d996-651e-b221-71978bde3a65@cs.ucla.edu> <87tvpdnzgy.fsf@tromey.com> <4c2a814f-c254-29e5-39cf-11b5f2e5c9c8@cs.ucla.edu> <49d8ba62-c9a5-9203-d882-8e900b441ff3@cs.ucla.edu> <8e0320d9-e0d0-2b57-57cc-2df4399f133c@cs.ucla.edu> <87lgaio7xd.fsf@tromey.com> <877em1cb0i.fsf@tromey.com> <765767b2-d2e5-a9a6-f724-d58ecf4847bb@cs.ucla.edu> <76081b5d-8c10-0a37-2c97-d4864c0faa80@cs.ucla.edu> <09153aed-361d-4f82-d9ac-b502314769ae@cs.ucla.edu> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: blaine.gmane.org 1534728752 27398 195.159.176.226 (20 Aug 2018 01:32:32 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 20 Aug 2018 01:32:32 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 Cc: emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Aug 20 03:32:28 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1frZ3T-0006yQ-6q for ged-emacs-devel@m.gmane.org; Mon, 20 Aug 2018 03:32:27 +0200 Original-Received: from localhost ([::1]:44643 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1frZ5Z-0008RW-IP for ged-emacs-devel@m.gmane.org; Sun, 19 Aug 2018 21:34:37 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:38144) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1frZ4s-0008RG-52 for emacs-devel@gnu.org; Sun, 19 Aug 2018 21:33:54 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1frZ4p-0005At-2H for emacs-devel@gnu.org; Sun, 19 Aug 2018 21:33:54 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:39474) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1frZ4o-00059l-SY for emacs-devel@gnu.org; Sun, 19 Aug 2018 21:33:51 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 1536016087B; Sun, 19 Aug 2018 18:33:49 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id MMBcPc0rg5gO; Sun, 19 Aug 2018 18:33:48 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 608DE160885; Sun, 19 Aug 2018 18:33:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id uZ1FxvoklVLr; Sun, 19 Aug 2018 18:33:48 -0700 (PDT) Original-Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 1C73B16087B; Sun, 19 Aug 2018 18:33:48 -0700 (PDT) In-Reply-To: Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 131.179.128.68 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:228704 Archived-At: Stefan Monnier wrote: > the time to lookup > up a GMP number in a hash table basically should never be longer than > the time it took to construct this number in the first place Doesn't a similar argument apply to the cost of construcing an Lisp float (including memory allocation)? If we hashed floats as well as bignums, eq==eql would be trivial.