From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Richard Stallman Newsgroups: gmane.emacs.devel Subject: Re: Using the GNU GMP Library for Bignums in Emacs Date: Fri, 04 May 2018 00:26:15 -0400 Message-ID: References: <29f933ac-a6bf-8742-66a7-0a9d6d3e5a88@disroot.org> <83bmecy6fx.fsf@gnu.org> <0d3175d8-d996-651e-b221-71978bde3a65@cs.ucla.edu> <42cbc5ab-2f02-4aa5-4b19-7b2357f91692@cs.ucla.edu> <1f58acbf-a7d8-bf4e-3d0e-a285515a22e6@cs.ucla.edu> <2549728d-8e40-b46a-009e-07cef0c24208@cs.ucla.edu> <63fdd138-77d3-89b9-aa69-490300f588a9@cs.ucla.edu> <838t90pr2l.fsf@gnu.org> <85ec3668-6b66-e47a-c10a-ffb3fc8be5d5@cs.ucla.edu> Reply-To: rms@gnu.org NNTP-Posting-Host: blaine.gmane.org Content-Type: text/plain; charset=Utf-8 X-Trace: blaine.gmane.org 1525407896 21063 195.159.176.226 (4 May 2018 04:24:56 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Fri, 4 May 2018 04:24:56 +0000 (UTC) Cc: eliz@gnu.org, eller.helmut@gmail.com, emacs-devel@gnu.org To: Paul Eggert Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri May 04 06:24:51 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 1fESH5-0005NQ-8m for ged-emacs-devel@m.gmane.org; Fri, 04 May 2018 06:24:51 +0200 Original-Received: from localhost ([::1]:60389 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fESJC-0000ud-Eu for ged-emacs-devel@m.gmane.org; Fri, 04 May 2018 00:27:02 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:53253) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fESIW-0000pz-Tp for emacs-devel@gnu.org; Fri, 04 May 2018 00:26:21 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fESIV-0001XE-Q1 for emacs-devel@gnu.org; Fri, 04 May 2018 00:26:20 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:53341) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fESIS-0001Um-Ka; Fri, 04 May 2018 00:26:16 -0400 Original-Received: from rms by fencepost.gnu.org with local (Exim 4.82) (envelope-from ) id 1fESIR-0002vx-PR; Fri, 04 May 2018 00:26:15 -0400 In-reply-to: <85ec3668-6b66-e47a-c10a-ffb3fc8be5d5@cs.ucla.edu> (message from Paul Eggert on Thu, 3 May 2018 11:26:31 -0700) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e 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:225058 Archived-At: [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] I don't think people want (format "%x" (lognot 257)) to output "-102". Not on any platform. It isn't what code expects, and it isn't useful. Perhaps, with bignums, lognot should take a width operand, measured in bits. So (lognot 257 32) would produce 0xfffffefe (a positive number) and (lognot 257 64) would produce 0xfffffffffffffefe (a positive number). Another idea: %Nx with a negative number should output its 2's complement representation in 4N bits. -- Dr Richard Stallman President, Free Software Foundation (https://gnu.org, https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org) Skype: No way! See https://stallman.org/skype.html.