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: integer overflow handling for most-negative-fixnum Date: Mon, 23 Jul 2018 12:18:57 -0700 Organization: UCLA Computer Science Department Message-ID: <56ddf9aa-e7b5-6ab7-bbb8-770e3b0f4c62@cs.ucla.edu> References: <867elsq78b.fsf@gmail.com> <866018yl76.fsf@gmail.com> <83a7qkzyhz.fsf@gnu.org> 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 1532373466 16519 195.159.176.226 (23 Jul 2018 19:17:46 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 23 Jul 2018 19:17:46 +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 Jul 23 21:17:42 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 1fhgL0-0004Ay-3G for ged-emacs-devel@m.gmane.org; Mon, 23 Jul 2018 21:17:42 +0200 Original-Received: from localhost ([::1]:36133 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fhgN6-0001ee-A1 for ged-emacs-devel@m.gmane.org; Mon, 23 Jul 2018 15:19:52 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:53181) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fhgMK-0001eY-W3 for emacs-devel@gnu.org; Mon, 23 Jul 2018 15:19:06 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fhgMF-0004ja-W0 for emacs-devel@gnu.org; Mon, 23 Jul 2018 15:19:04 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:53580) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fhgMF-0004jQ-Mk for emacs-devel@gnu.org; Mon, 23 Jul 2018 15:18:59 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id B9564160DFC; Mon, 23 Jul 2018 12:18:58 -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 ta2Rkgv0Ar10; Mon, 23 Jul 2018 12:18:58 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 0D587160DFD; Mon, 23 Jul 2018 12:18:58 -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 dJgyeyDThQYv; Mon, 23 Jul 2018 12:18:57 -0700 (PDT) Original-Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id C2E1E160DFC; Mon, 23 Jul 2018 12:18:57 -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: 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:227740 Archived-At: Stefan Monnier wrote: > Sounds great to me, I implemented a form of that proposal, but it turns out that bitwidth mod= ifiers=20 are tricker than they look (not least: tricky to document). So I audited = the GNU=20 Emacs source code looking to see how much of the bitwidth-modifier functi= onality=20 would be useful -- and I couldn't find any places where it would be. So f= or now=20 I plan to implement that proposal without bitwidth modifiers. Please see = Bug#32252. I can add some form of bitwidth modifiers later if we find use cases that= can=20 help motivate what to do about the corner cases.