From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.bugs Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations? Date: Sat, 25 Jul 2020 16:07:37 -0400 Message-ID: References: <3A9CC2A3-8307-47B2-8D80-795C0AF020E1@acm.org> <0433A879-C98D-4B1A-B85C-A15DA9289099@acm.org> <1621669100.2102667.1593639091621@mail.yahoo.com> <33C2E2C8-16A6-47A9-B3A4-8A5F43648E04@acm.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="39908"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= , Paul Eggert , Andrea Corallo , 42147@debbugs.gnu.org To: Philipp Stephani Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Jul 25 22:09:17 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 1jzQTt-000AIH-EZ for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 25 Jul 2020 22:09:17 +0200 Original-Received: from localhost ([::1]:48242 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jzQTr-0004Hs-Vn for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 25 Jul 2020 16:09:16 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:47982) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jzQTe-000466-Fu for bug-gnu-emacs@gnu.org; Sat, 25 Jul 2020 16:09:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:39678) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jzQTe-0007Qo-6L for bug-gnu-emacs@gnu.org; Sat, 25 Jul 2020 16:09:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jzQTe-0002JJ-2B for bug-gnu-emacs@gnu.org; Sat, 25 Jul 2020 16:09:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 25 Jul 2020 20:09:02 +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=B42147.15957076868792 (code B ref 42147); Sat, 25 Jul 2020 20:09:02 +0000 Original-Received: (at 42147) by debbugs.gnu.org; 25 Jul 2020 20:08:06 +0000 Original-Received: from localhost ([127.0.0.1]:51220 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jzQSj-0002Hk-UV for submit@debbugs.gnu.org; Sat, 25 Jul 2020 16:08:06 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:61046) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jzQSi-0002H8-4i for 42147@debbugs.gnu.org; Sat, 25 Jul 2020 16:08:04 -0400 Original-Received: from pmg2.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id D027680B35; Sat, 25 Jul 2020 16:07:58 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 8E6D880541; Sat, 25 Jul 2020 16:07:41 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1595707661; bh=POnqbz+4+K2wYJfsjlOOZSWHqIDd6KQhFlJMvcBi0PY=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=drAbBo+O7vBS7Mi9Thg0lOQ1dmzS+edIySzgSo5uRn2wrZVg5vEtf8uVuYTN4wCsD nT2QgJfUdkj012dBokVL+VJR252zdfL4WJZNthoNYKeLAvvOy4z+oU0aVRYLCvWqab Bi9TQVKS50zpL/I0djGSdFUMkzeWIMRzBnxg+ikdeXg6F+pJ31z5lEyc6at87TE8lc OUowrONYuHfss2yMb92yLiAn1QOVcA7zvf+9lG6ZWzBO4QyB3YNasVedqTVvxEIX5K GwyV3+YCW2HLEifjZbrYpUnijn91R8TN7LznICvC5+Oiv2lq0VJeH0aVZJN1OUBpv/ xIvLYhbA3NmBw== Original-Received: from milanesa (unknown [104.247.229.155]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 47FBA12059A; Sat, 25 Jul 2020 16:07:41 -0400 (EDT) In-Reply-To: (Philipp Stephani's message of "Sat, 25 Jul 2020 22:03:03 +0200") 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:183549 Archived-At: > That sounds like a very reasonable definition. Do you think it's > equivalent to my hypothesis and/or to the current behavior of the byte > optimizer? Probably not exactly: there might be functions which don't always "preserve `eql`" but for which we decide nevertheless that it's OK to precompute them at compile time for pragmatic reasons. E.g. `concat`. Stefan