From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Newsgroups: gmane.emacs.bugs Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations? Date: Fri, 3 Jul 2020 11:32:35 +0200 Message-ID: <2CEB4A36-3DDF-4868-B8E0-B6AC35C1DFAF@acm.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> <43ce844e-b239-0c39-ad4f-86fec376f945@cs.ucla.edu> Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.14\)) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="7564"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Stefan Monnier , Andrea Corallo , 42147@debbugs.gnu.org To: Paul Eggert Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Jul 03 11:35:19 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 1jrI6I-0001pq-UQ for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 03 Jul 2020 11:35:18 +0200 Original-Received: from localhost ([::1]:52932 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jrI6H-0006fK-UQ for geb-bug-gnu-emacs@m.gmane-mx.org; Fri, 03 Jul 2020 05:35:17 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:42378) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jrI47-0001uF-0V for bug-gnu-emacs@gnu.org; Fri, 03 Jul 2020 05:33:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:44910) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jrI46-0003ju-Jm for bug-gnu-emacs@gnu.org; Fri, 03 Jul 2020 05:33:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1jrI46-0005vd-Gt for bug-gnu-emacs@gnu.org; Fri, 03 Jul 2020 05:33:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Fri, 03 Jul 2020 09:33:02 +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=B42147.159376877522773 (code B ref 42147); Fri, 03 Jul 2020 09:33:02 +0000 Original-Received: (at 42147) by debbugs.gnu.org; 3 Jul 2020 09:32:55 +0000 Original-Received: from localhost ([127.0.0.1]:56455 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jrI3z-0005vF-C2 for submit@debbugs.gnu.org; Fri, 03 Jul 2020 05:32:55 -0400 Original-Received: from mail1467c50.megamailservers.eu ([91.136.14.67]:47364 helo=mail268c50.megamailservers.eu) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1jrI3x-0005ur-4R for 42147@debbugs.gnu.org; Fri, 03 Jul 2020 05:32:53 -0400 X-Authenticated-User: mattiase@bredband.net DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=megamailservers.eu; s=maildub; t=1593768758; bh=iDP9TvKcQqQ4k82/ewPawmNLZDDUv18+52BzAyJPwFg=; h=Subject:From:In-Reply-To:Date:Cc:References:To:From; b=qLyfsYV1tOa2dvIT1MwyZhPIr2rYsv/wLqfH1MG3F1QmoH4XGOuk9FC2gyVgF9Amp DL8UEDSOO/SBJtkUVUBClVzbZHQSJBTkzm+79xtOPGccAWNZDKLPBfxaOzTUkX4hSs 2aQjbZTGCWa6AW29NGjPfJwGAA3AYmY0WyxQJYjU= Feedback-ID: mattiase@acm.or Original-Received: from [192.168.0.4] (c188-150-171-71.bredband.comhem.se [188.150.171.71]) (authenticated bits=0) by mail268c50.megamailservers.eu (8.14.9/8.13.1) with ESMTP id 0639WZ5w001874; Fri, 3 Jul 2020 09:32:37 +0000 In-Reply-To: <43ce844e-b239-0c39-ad4f-86fec376f945@cs.ucla.edu> X-Mailer: Apple Mail (2.3445.104.14) X-CTCH-RefID: str=0001.0A782F26.5EFEFB36.007D, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 X-CTCH-VOD: Unknown X-CTCH-Spam: Unknown X-CTCH-Score: 0.000 X-CTCH-Flags: 0 X-CTCH-ScoreCust: 0.000 X-CSC: 0 X-CHA: v=2.3 cv=BZ+mLYl2 c=1 sm=1 tr=0 a=SF+I6pRkHZhrawxbOkkvaA==:117 a=SF+I6pRkHZhrawxbOkkvaA==:17 a=kj9zAlcOel0A:10 a=M51BFTxLslgA:10 a=s-JEzVKBLHgALf_x9nkA:9 a=CjuIK1q_8ugA:10 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:182659 Archived-At: 2 juli 2020 kl. 22.09 skrev Paul Eggert : >> Note that it can also be done without slowing down `eq` (by >> hash-consing the bignums). >=20 > Yes, that's a better way to go. I wrote a patch to do that a while ago = but never > got around to the laborious part, which was benchmarking. Hash-consing bignums may be a good idea (I'm neutral on the idea), but = there could be a reason why it isn't very commonly seen in other = runtimes; perhaps they have more efficient GCs (generational and/or = incremental), but Emacs would benefit (a lot) from that, too. In any case, it's a one-way decision: once we guarantee eq to provide = numerical equality (whether by hash-consing or otherwise), there is no = way back.