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 17:05:42 +0300 Message-ID: <83woxp66vd.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>> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1522677833 15040 195.159.176.226 (2 Apr 2018 14:03:53 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 2 Apr 2018 14:03:53 +0000 (UTC) Cc: rpluim@gmail.com, eggert@cs.ucla.edu, npostavs@gmail.com, pipcet@gmail.com, emacs-devel@gnu.org To: Drew Adams Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Apr 02 16:03:48 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 1f303k-0003kK-7g for ged-emacs-devel@m.gmane.org; Mon, 02 Apr 2018 16:03:44 +0200 Original-Received: from localhost ([::1]:37319 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f305n-0003Hc-NY for ged-emacs-devel@m.gmane.org; Mon, 02 Apr 2018 10:05:51 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:48901) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f305d-0003GY-Sa for emacs-devel@gnu.org; Mon, 02 Apr 2018 10:05:42 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f305Z-00041K-O5 for emacs-devel@gnu.org; Mon, 02 Apr 2018 10:05:41 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:42732) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f305Z-00041C-KU; Mon, 02 Apr 2018 10:05:37 -0400 Original-Received: from [176.228.60.248] (port=2537 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1f305Z-0008TT-48; Mon, 02 Apr 2018 10:05:37 -0400 In-reply-to: (message from Drew Adams on Mon, 2 Apr 2018 06:37:40 -0700 (PDT)) 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:224243 Archived-At: > Date: Mon, 2 Apr 2018 06:37:40 -0700 (PDT) > From: Drew Adams > Cc: rpluim@gmail.com, eggert@cs.ucla.edu, pipcet@gmail.com, emacs-devel@gnu.org > > Would it be possible for a user or Lisp code to be > able to specify that it does not want the byte compiler > to perform such floating-point optimization, in order > to provide more platform-independence? We didn't yet decide to make any changes in the byte compiler, so I see no need to discuss such fire escapes. The current trend is to disable optimizations when they harm portability or cause undefined or unspecified behavior.