From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Using the GNU GMP Library for Bignums in Emacs Date: Sun, 22 Apr 2018 23:03:18 -0400 Message-ID: References: <29f933ac-a6bf-8742-66a7-0a9d6d3e5a88@disroot.org> <83bmecy6fx.fsf@gnu.org> <0d3175d8-d996-651e-b221-71978bde3a65@cs.ucla.edu> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1524452494 10768 195.159.176.226 (23 Apr 2018 03:01:34 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 23 Apr 2018 03:01:34 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Apr 23 05:01:30 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 1fARjN-0002gf-Ie for ged-emacs-devel@m.gmane.org; Mon, 23 Apr 2018 05:01:29 +0200 Original-Received: from localhost ([::1]:59653 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fARlU-0001QG-AQ for ged-emacs-devel@m.gmane.org; Sun, 22 Apr 2018 23:03:40 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35326) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fARlM-0001PC-VE for emacs-devel@gnu.org; Sun, 22 Apr 2018 23:03:33 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fARlI-0001x3-3g for emacs-devel@gnu.org; Sun, 22 Apr 2018 23:03:33 -0400 Original-Received: from [195.159.176.226] (port=48389 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fARlH-0001wd-Sh for emacs-devel@gnu.org; Sun, 22 Apr 2018 23:03:28 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1fARj9-0002RU-BW for emacs-devel@gnu.org; Mon, 23 Apr 2018 05:01:15 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 22 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:P/6bmnTc+S5MRl+yAj0rd/w0oAU= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 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:224793 Archived-At: >> Surely we should just add bignum support to existing functions +, -, >> etc. > I'm not so sure of that. E.g. (format "%x" -1) => "3fffffffffffffff". > That doesn't make any sense on if -1 is a bignum. Note that (format "%x" -1) does not necessarily use functions in "+, -, etc..." There are several steps to adding GMP support. Some of those steps might involve non-trivial decisions. But the first few steps should be straightforward enough: A- add a new "bignum" type B- add new operations on them (this might be enough to start using them in Calc) C- add support for bignums to some of the pre-existing functions (e.g. +) D- add support for bignums to more of the pre-existing functions E- add support for bignums "everywhere" where numbers are usually allowed. Anything before D/E should be fairly straightforward. I consider "support for read&print" to fall somewhere in D or maybe E. Stefan