From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: integer overflow handling for most-negative-fixnum Date: Sat, 21 Jul 2018 21:23:22 +0300 Message-ID: <83a7qkxxb9.fsf@gnu.org> References: <867elsq78b.fsf@gmail.com> <866018yl76.fsf@gmail.com> <83a7qkzyhz.fsf@gnu.org> <83d0vgxxx8.fsf@gnu.org> <50d4d468-e7f0-2a04-c32d-423804292e83@cs.ucla.edu> NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1532197291 18247 195.159.176.226 (21 Jul 2018 18:21:31 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 21 Jul 2018 18:21:31 +0000 (UTC) Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org To: Paul Eggert Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Jul 21 20:21:27 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 1fgwVP-0004Zh-OQ for ged-emacs-devel@m.gmane.org; Sat, 21 Jul 2018 20:21:23 +0200 Original-Received: from localhost ([::1]:53579 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fgwXW-0005IG-Eb for ged-emacs-devel@m.gmane.org; Sat, 21 Jul 2018 14:23:34 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:50767) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fgwXK-0005HC-LS for emacs-devel@gnu.org; Sat, 21 Jul 2018 14:23:23 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fgwXJ-0000D5-1y for emacs-devel@gnu.org; Sat, 21 Jul 2018 14:23:22 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:35859) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fgwXI-0000Cy-TG; Sat, 21 Jul 2018 14:23:20 -0400 Original-Received: from [176.228.60.248] (port=3428 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1fgwXI-0001li-1z; Sat, 21 Jul 2018 14:23:20 -0400 In-reply-to: <50d4d468-e7f0-2a04-c32d-423804292e83@cs.ucla.edu> (message from Paul Eggert on Sat, 21 Jul 2018 11:17:24 -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:227633 Archived-At: > Cc: emacs-devel@gnu.org > From: Paul Eggert > Date: Sat, 21 Jul 2018 11:17:24 -0700 > > Eli Zaretskii wrote: > > I'd like it to read #x3fffffffffffffff as -1. > > That won't work once we have bignums. Even now, it'd be problematic behavior on > 32-bit machines. We should insulate Lisp programmers from fixnum width as much > as possible. Currently, this doesn't work on any machine. Is that reasonable?