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: Checking for loss of information on integer conversion Date: Sun, 18 Feb 2018 20:47:27 -0500 Message-ID: References: <7432641a-cedc-942c-d75c-0320fce5ba39@cs.ucla.edu> <87woza7wwi.fsf@trurl.irif.fr> <87sh9x97yz.fsf@trurl.irif.fr> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1519004809 6504 195.159.176.226 (19 Feb 2018 01:46:49 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 19 Feb 2018 01:46:49 +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 Feb 19 02:46:45 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 1enaX0-00081p-3V for ged-emacs-devel@m.gmane.org; Mon, 19 Feb 2018 02:46:14 +0100 Original-Received: from localhost ([::1]:47144 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1enaZ2-0006yf-8Z for ged-emacs-devel@m.gmane.org; Sun, 18 Feb 2018 20:48:20 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:57757) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1enaYs-0006yW-GS for emacs-devel@gnu.org; Sun, 18 Feb 2018 20:48:11 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1enaYn-0002ys-M2 for emacs-devel@gnu.org; Sun, 18 Feb 2018 20:48:10 -0500 Original-Received: from [195.159.176.226] (port=51151 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1enaYn-0002yg-Ex for emacs-devel@gnu.org; Sun, 18 Feb 2018 20:48:05 -0500 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1enaWM-0005Oi-7u for emacs-devel@gnu.org; Mon, 19 Feb 2018 02:45:34 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 15 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:dHtOk85k4wsaI2oic+SollgbyI8= 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:222889 Archived-At: >> That would be a regression. On 32bit systems, there are various >> circumstances where we need to read a 32bit ID > I can see how this could be a problem, but I still find the current > semantics pretty horrible, It's not pretty indeed. > Perhaps Emacs could acquire small bignums? Say, boxed 64-bit integers > with signal on overflow? I don't think adding actual bignums via (say) libgmp would be significantly harder than adding such "small bignums. Stefan