From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Andrea Corallo via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations? Date: Tue, 7 Jul 2020 16:24:30 +0000 (UTC) Message-ID: <475381031.6812910.1594139070322@mail.yahoo.com> 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> <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> Reply-To: Andrea Corallo Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11894"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 42147-done@debbugs.gnu.org, Paul Eggert , Stefan Monnier , 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 Tue Jul 07 18:44:09 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 1jsqhV-0002zL-JU for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 07 Jul 2020 18:44:09 +0200 Original-Received: from localhost ([::1]:53812 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jsqhU-0005Nk-Gs for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 07 Jul 2020 12:44:08 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36534) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jsqP0-0004Iv-Mo for bug-gnu-emacs@gnu.org; Tue, 07 Jul 2020 12:25:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:53301) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jsqP0-0001fp-5s for bug-gnu-emacs@gnu.org; Tue, 07 Jul 2020 12:25:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jsqP0-0001bF-25 for bug-gnu-emacs@gnu.org; Tue, 07 Jul 2020 12:25:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Andrea Corallo Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 07 Jul 2020 16:25:02 +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-done@debbugs.gnu.org id=D42147.15941390966135 (code D ref 42147); Tue, 07 Jul 2020 16:25:02 +0000 Original-Received: (at 42147-done) by debbugs.gnu.org; 7 Jul 2020 16:24:56 +0000 Original-Received: from localhost ([127.0.0.1]:36614 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jsqOu-0001aq-0J for submit@debbugs.gnu.org; Tue, 07 Jul 2020 12:24:56 -0400 Original-Received: from sonic306-20.consmr.mail.ir2.yahoo.com ([77.238.176.206]:36035) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jsqOc-0001aB-4Z for 42147-done@debbugs.gnu.org; Tue, 07 Jul 2020 12:24:54 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.it; s=s2048; t=1594139071; bh=Q5wb/4Th9GKPdR21gHSSIqfHy0/l3ODiwJwFFNmbkcU=; h=Date:From:To:Cc:In-Reply-To:References:Subject:From:Subject; b=YYijX6Sjm+Za9ZT6aBI2sLV7TGg136pNxWi7zYKuvvUZ1XJejabmC1GdmKsXalrwuEsdKiwZKHAZ4HhbZavN044GTKbiyCEgNvHtaZVsJJ0A/wC7tkvv/fwjnHG95g+mjmA6mZxMrNIQoGTfZ0/WbQnsUBSf1tCBXRA/zL3SFrVZn7Ayu8GJIxoF5ZKElulfokbFwFSSMO/FddQb2MgYLluSOqqZdSacddgfuFseGBNKDTlU+fxPwZPoya7gtjhWdbJs06ixlxDgsufIZM2MIseaS6KZQxhMgpPWj1O8pbMkTuomC9JfiNnk2StR+evwTBST6lVc35tgtubX7If3+Q== X-YMail-OSG: bcvEBKQVM1ngeL8uy87OZuaFp8VRCSr2WZ0SRQ6fOKliAgLUtoB4tkv.gaYOLhh lgHB9qVvaxDFAGrVV.CBWP7F4oP2iFVrzDN8ea95gneLcy6DwDyjI74VWYjZXjoa5_WKu75CdEie r26nDvrcTsfddxWy8CF0qbBmE7LUZ6LBiNTZ0v1fXjecvW6YfVJqprDYFLIY4Rpa8l_nvtOLjYlr MdJ4wdCfY8dOk6GNQUYXGzDYeyTurE4seoxEWSWKoKpJbjaMl4ivyzeHmzNJEYsysXccIIlL8ms9 NuT6xPlwUpDMUojd_3LPPpN.T.QYfPYqF5QVqdWo.ekal6J69VvyX0N9KxzWNtM5xbBz430.HP5k M4u_7rr5_r7NiITr06b7DI5cxv_4lzVsC.roXipRpW9o9D9KlBF86lip40h3Iy_B_45HkHfj8wu. U1WfVLPjriMf1Qn9Z0RhDZ51_B7LcO00Y0T45wKNMqH5l11UwpfR4Xuigti6IU258jxcM1bOmkVp lh94g8sDiCLtUGN56eLywse5.Uo1sG8mqFoO0ZOVJgjVYhwRzHAbcDypuyGz30IjBvhYaWoVr31j hjxkSXfet_JzAA_9LD.2H7EtPH35Uhm7gCRizJjnTNevh25oB3Tg6A_sBVBBClaSA9f6mmEpBkUv 609gJj.gk5CVqqd54IZ7R_.KPJ0S2BLTN_B3LmB2UsfgY0YVzxT6D6VJWdhIeXXd9sm6BPzV1yoX PHl7uAV5mo9FSz6TSldVFRdWTmyS55Y6oebTtvvSANoP7W7kvnCP7CpQnL_XUzWZj.mod6biD_kQ 5vZbcoUcTaIirFGz_1zmp_awtuaFQl6qODAFjpqkPA Original-Received: from sonic.gate.mail.ne1.yahoo.com by sonic306.consmr.mail.ir2.yahoo.com with HTTP; Tue, 7 Jul 2020 16:24:31 +0000 In-Reply-To: X-Mailer: WebService/1.1.16197 YMailNorrin Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:70.0) Gecko/20100101 Firefox/70.0 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:182808 Archived-At: Mattias Engdeg=C3=A5rd writes: > 6 juli 2020 kl. 23.23 skrev Andrea Corallo : > >> Yes I am happy :) Not sure about the floating point discussion >> originated from this but on my side this bug can be closed. > > Then closed it is. I would happily write something in NEWS but -- as > Eli noted -- for any noticeable change in behaviour to occur, many > conditions need to be met, several of which are quite unlikely. > > More improvements to the constant-folding are possible and desirable. For= example, I have a patch that deals with constant expressions in let-bindin= gs, so that > > (let ((x (+ 1 2))) >=C2=A0=C2=A0 (f x)) > > simplifies to (f 3), with the variable x removed. This in turn > generates more opportunities for further simplification and dead-code > elimination. Tell me if you are interested. Sure I'm.=C2=A0 The native compiler does it already but I'm curious to see how you do it at source level and how generic it is. Thanks =C2=A0 Andrea