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: Thu, 09 Jul 2020 08:47:03 -0400 Message-ID: References: <3A9CC2A3-8307-47B2-8D80-795C0AF020E1@acm.org> <6CF8EE58-9A49-40E7-AA86-48AB39BF94BA@acm.org> <28B19D86-343C-4126-B95F-1F38735F73F2@acm.org> <1288c6a5-545b-f68c-ff6b-7683db3e54c1@cs.ucla.edu> <1690361185.4397117.1593879228865@mail.yahoo.com> <374F2E9C-E8C2-4362-8BEF-E6AA5EEE5C79@acm.org> <68F4CFD4-17BF-4ADA-B2EF-55281ACD2373@acm.org> <926674413.6042347.1594070583586@mail.yahoo.com> <475381031.6812910.1594139070322@mail.yahoo.com> <459BE59A-76CE-46A3-BE5E-B65AED0B85F5@acm.org> <4A6D5CD1-031E-4DF8-9FE5-365DF17E14CA@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="15873"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: 42147-done@debbugs.gnu.org, Paul Eggert , Andrea Corallo , Andrea Corallo To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Jul 09 14:48:24 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 1jtVyS-000421-0K for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 09 Jul 2020 14:48:24 +0200 Original-Received: from localhost ([::1]:45492 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jtVyQ-00028E-VO for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 09 Jul 2020 08:48:22 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51916) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jtVy6-00027g-7U for bug-gnu-emacs@gnu.org; Thu, 09 Jul 2020 08:48:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:56890) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jtVy5-0005dW-Uf for bug-gnu-emacs@gnu.org; Thu, 09 Jul 2020 08:48:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jtVy5-0006hq-Ro for bug-gnu-emacs@gnu.org; Thu, 09 Jul 2020 08:48:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 09 Jul 2020 12:48:01 +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-done@debbugs.gnu.org id=D42147.159429883525724 (code D ref 42147); Thu, 09 Jul 2020 12:48:01 +0000 Original-Received: (at 42147-done) by debbugs.gnu.org; 9 Jul 2020 12:47:15 +0000 Original-Received: from localhost ([127.0.0.1]:40203 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jtVxL-0006gq-L9 for submit@debbugs.gnu.org; Thu, 09 Jul 2020 08:47:15 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:30323) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jtVxJ-0006gb-Hk for 42147-done@debbugs.gnu.org; Thu, 09 Jul 2020 08:47:13 -0400 Original-Received: from pmg2.iro.umontreal.ca (localhost.localdomain [127.0.0.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id 97B9580C96; Thu, 9 Jul 2020 08:47:07 -0400 (EDT) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg2.iro.umontreal.ca (Proxmox) with ESMTP id F20AE80292; Thu, 9 Jul 2020 08:47:05 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1594298825; bh=Vp2zviKeldECHvu2nVXpt7+4AAZzfeyezVB3D0Q+aAI=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=eWxZOJtvO6ENxnS9Su+eQVm2fPUIcM/9bxN7mzixx65XRNOSLRzd0lPW30eKGMdFf 7ymuG48MMivonqfJkNiYJyCk/HRtD2VaKtIEjXkOWf/y615qI7/YLZ4gNS6uDPlzAS iLoeJqa7HLVeFiYYEvc/KP4QPL6MoWpOZ6vhZDoRWmHbbSRv65w8hyr2Z1voRf6fOm IP1DMmFqON1+MUCOf60fvBFjc12NzJMfhM2rXHi5LAKiMoBhGkTp6TvoEnMFvKmG62 Pe7HsHFuOu3qDBJZtrhp5aucmt/3+mJVisUR0Zpaf+e44mv+8y++k8sMYqZDQxb8UF FFtBEaRn/CrJQ== Original-Received: from alfajor (unknown [157.52.0.200]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 8957D12081B; Thu, 9 Jul 2020 08:47:05 -0400 (EDT) In-Reply-To: <4A6D5CD1-031E-4DF8-9FE5-365DF17E14CA@acm.org> ("Mattias =?UTF-8?Q?Engdeg=C3=A5rd?="'s message of "Thu, 9 Jul 2020 12:20:34 +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:182861 Archived-At: > String mutation is something of a special case: it is rare, yet its mere > possibility incurs costs even for code that doesn't use it. Yes and no: it's *very* rare to change the sequence of characters which compose a string, yes, but until the addition of `propertize` (in Emacs-21) mutation was the only way to add text-properties to a string, so it's still quite common. Stefan