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: Using the GNU GMP Library for Bignums in Emacs Date: Fri, 6 Jul 2018 14:00:40 -0700 Organization: UCLA Computer Science Department Message-ID: <4c2a814f-c254-29e5-39cf-11b5f2e5c9c8@cs.ucla.edu> References: <29f933ac-a6bf-8742-66a7-0a9d6d3e5a88@disroot.org> <83bmecy6fx.fsf@gnu.org> <0d3175d8-d996-651e-b221-71978bde3a65@cs.ucla.edu> <87tvpdnzgy.fsf@tromey.com> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1530910727 22196 195.159.176.226 (6 Jul 2018 20:58:47 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 6 Jul 2018 20:58:47 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 Cc: emacs-devel@gnu.org To: Tom Tromey , Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Jul 06 22:58:43 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 1fbXoR-0005gr-7D for ged-emacs-devel@m.gmane.org; Fri, 06 Jul 2018 22:58:43 +0200 Original-Received: from localhost ([::1]:59631 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fbXqY-0002Pp-D5 for ged-emacs-devel@m.gmane.org; Fri, 06 Jul 2018 17:00:54 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55628) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fbXqR-0002PT-I6 for emacs-devel@gnu.org; Fri, 06 Jul 2018 17:00:48 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fbXqO-0002sP-IY for emacs-devel@gnu.org; Fri, 06 Jul 2018 17:00:47 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:34314) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fbXqO-0002rp-9X for emacs-devel@gnu.org; Fri, 06 Jul 2018 17:00:44 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 08A2D1615FB; Fri, 6 Jul 2018 14:00:42 -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 VWRr5P87OBsS; Fri, 6 Jul 2018 14:00:41 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 42BE316161C; Fri, 6 Jul 2018 14:00:41 -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 idbiIbdVfzBR; Fri, 6 Jul 2018 14:00:41 -0700 (PDT) Original-Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id E82931615FB; Fri, 6 Jul 2018 14:00:40 -0700 (PDT) Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECH In-Reply-To: <87tvpdnzgy.fsf@tromey.com> Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] 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:227023 Archived-At: Tom Tromey wrote: > 1. Should the C core change the names of things like NUMBERP to FIXNUMP= ? > Similarly should make_number -> make_fixnum? Yes, we should keep things clear in the C core, and this would definitely= be=20 clearer. Please do it as a separate commit, though. > 2. What is (type-of 5)? Right now 'integer, but arguably perhaps > 'fixnum is correct. Gerd's branch did this. 'integer', for the same reason that (type-of 5) doesn't return 'natnum'. = fixnum=20 and natnum are both subtypes of integer, and the basic type is integer. = The=20 other ways of doing this would cause more trouble to user code. > 3. Should intbig_to_lisp et al be converted to use bignums? > I'm inclined to say no, for compatibility. Yes, that function should now return only fixnums and bignums (assuming G= MP is=20 available). Of course the reverse functions that converts lisp to C integ= er also=20 needs to work with bignums in C range. > 4. Should it be possible to make a "low-valued bignum"? No, as too much Lisp code depends on eq acting like =3D on fixnums. Altho= ugh this=20 will not work for bignums (unless we take Stefan's suggestion...), it sho= uld=20 continue to work on integers that can fit into fixnum range. Thanks for working on this!