From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations? Date: Sun, 05 Jul 2020 05:38:55 +0300 Message-ID: <83lfjyu1mo.fsf@gnu.org> References: <3A9CC2A3-8307-47B2-8D80-795C0AF020E1@acm.org> <0433A879-C98D-4B1A-B85C-A15DA9289099@acm.org> <1621669100.2102667.1593639091621@mail.yahoo.com> <775819003.2516724.1593687594435@mail.yahoo.com> <5F2B4684-34D1-4474-8909-9F435369FE54@acm.org> <705260433.2731607.1593698199171@mail.yahoo.com> <6CF8EE58-9A49-40E7-AA86-48AB39BF94BA@acm.org> <28B19D86-343C-4126-B95F-1F38735F73F2@acm.org> <1288c6a5-545b-f68c-ff6b-7683db3e54c1@cs.ucla.edu> <0AF276D8-FB28-4745-AAE4-DC30E0441F89@acm.org> <793d67e0-68a0-fc53-89a9-0902747d6389@cs.ucla.edu> <83zh8ftfwr.fsf@gnu.org> <672f15b0-04f9-e884-4815-85ca1d1af9bb@cs.ucla.edu> <6d8ba3b1-86b8-3dc8-3d80-17222d436b80@cs.ucla.edu> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37612"; mail-complaints-to="usenet@ciao.gmane.io" Cc: mattiase@acm.org, eggert@cs.ucla.edu, monnier@iro.umontreal.ca, andrea_corallo@yahoo.it, 42147@debbugs.gnu.org To: Pip Cet Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jul 05 04:39:11 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jruYg-0009fU-EA for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 05 Jul 2020 04:39:10 +0200 Original-Received: from localhost ([::1]:39472 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jruYe-0006TV-Ra for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 04 Jul 2020 22:39:08 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53902) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jruYY-0006TK-7z for bug-gnu-emacs@gnu.org; Sat, 04 Jul 2020 22:39:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:48365) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jruYX-0006NP-VL for bug-gnu-emacs@gnu.org; Sat, 04 Jul 2020 22:39:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jruYX-00086d-S8 for bug-gnu-emacs@gnu.org; Sat, 04 Jul 2020 22:39:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 05 Jul 2020 02:39:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 42147 X-GNU-PR-Package: emacs Original-Received: via spool by 42147-submit@debbugs.gnu.org id=B42147.159391673931150 (code B ref 42147); Sun, 05 Jul 2020 02:39:01 +0000 Original-Received: (at 42147) by debbugs.gnu.org; 5 Jul 2020 02:38:59 +0000 Original-Received: from localhost ([127.0.0.1]:59911 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jruYV-00086J-2Q for submit@debbugs.gnu.org; Sat, 04 Jul 2020 22:38:59 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:39518) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jruYT-000867-Hv for 42147@debbugs.gnu.org; Sat, 04 Jul 2020 22:38:58 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:57077) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jruYN-0006Mi-Ku; Sat, 04 Jul 2020 22:38:51 -0400 Original-Received: from [176.228.60.248] (port=1637 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1jruYN-0001xF-0l; Sat, 04 Jul 2020 22:38:51 -0400 In-Reply-To: (message from Pip Cet on Sat, 4 Jul 2020 22:25:55 +0000) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:182727 Archived-At: > From: Pip Cet > Date: Sat, 4 Jul 2020 22:25:55 +0000 > Cc: mattiase@acm.org, Paul Eggert , andrea_corallo@yahoo.it, > 42147@debbugs.gnu.org > > > I'm actually not completely sure why we care about those minor > > rounding differences. > > Neither am I. If the idea is to standardize Emacs on a single > floating-point representation, let's at least use the 61-bit floats > Paul suggested a while back? (Incidentally, I believe those can be > implemented somewhat more efficiently on x87 hardware). Or we could go > with bignum ratios or GMP floats. Some other relevant questions: . why didn't GCC folks made SSE2 the default output? shouldn't Emacs follow the defaults, and leave it to the experts to decide which instruction set should be the default? . which other projects use this non-standard instruction set? GNU Guile, for example, doesn't, so why should we?