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: Floating-point constant folding in Emacs byte compiler Date: Mon, 02 Apr 2018 22:58:18 +0300 Message-ID: <83tvst5qjp.fsf@gnu.org> References: <2ce39e5c-cd1b-65d6-b125-719caad67932@cs.ucla.edu> <83vadmgfbz.fsf@gnu.org> <87d0zr2n1u.fsf@gmail.com> <83h8p2g99p.fsf@gnu.org> <87370m3k4y.fsf@gmail.com> <838taeg6z5.fsf@gnu.org> <7a49cbdf-f2c3-0803-2ee8-3d9f55e405a5@cs.ucla.edu> <7a4f10ec-c1b9-953d-7a95-b2f1ff762735@cs.ucla.edu> <83y3i568i0.fsf@gnu.org> <058336f6-1b68-69c5-27ee-13edeb86f636@cs.ucla.edu> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: blaine.gmane.org 1522699019 21455 195.159.176.226 (2 Apr 2018 19:56:59 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 2 Apr 2018 19:56:59 +0000 (UTC) Cc: eggert@cs.ucla.edu, emacs-devel@gnu.org To: Pip Cet Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Apr 02 21:56:54 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 1f35ZW-0005Un-3O for ged-emacs-devel@m.gmane.org; Mon, 02 Apr 2018 21:56:54 +0200 Original-Received: from localhost ([::1]:59547 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f35bZ-0002Em-Sl for ged-emacs-devel@m.gmane.org; Mon, 02 Apr 2018 15:59:01 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:36200) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f35ar-0002EA-46 for emacs-devel@gnu.org; Mon, 02 Apr 2018 15:58:17 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f35ao-0008TK-1H for emacs-devel@gnu.org; Mon, 02 Apr 2018 15:58:17 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:49297) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f35an-0008T9-TV; Mon, 02 Apr 2018 15:58:13 -0400 Original-Received: from [176.228.60.248] (port=3086 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1f35am-000848-V0; Mon, 02 Apr 2018 15:58:13 -0400 In-reply-to: (message from Pip Cet on Mon, 2 Apr 2018 19:39:13 +0000) 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:224257 Archived-At: > From: Pip Cet > Date: Mon, 2 Apr 2018 19:39:13 +0000 > Cc: emacs-devel@gnu.org > > Floating-point numbers of equal value are ‘eql’, but they may not be ‘eq’. > > I think that matches what I want (which is to be free to merge all > floats of equal value right away), and it matches your change, but not > what Eli suggested was legitimate. We could be mis-communicating: you said "EQ", not 'eq', so I thought you wanted to supplant the EQ macro on the C level to return non-zero for two float objects whose values compare equal. Now it sounds like you were talking about something entirely different, something that only matters on the Lisp level.