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, 02 Jul 2020 15:38:25 -0400 Message-ID: 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> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30310"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Paul Eggert , Andrea Corallo , 42147@debbugs.gnu.org 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 02 21:39:09 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 1jr537-0007oT-7L for geb-bug-gnu-emacs@m.gmane-mx.org; 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h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=O67d/iXOT0GQ7B92nkDmLgcX5hEblXfOQvHyMouCnmshAj3A0UJ3iO9UZOr0Zd7fH dNoyc50Oi3+tfeqxWEGf/ApZ5m70TI6LsoHJNCbw36MWpynYK0kl5toyBOI1AkFKgz Y/a8rXi06B+wP8z+TK1U+0pzVpQzT4TWxwKx90fqqadHTwhu6VP2fjPF1yu81bv9pb 4AG/VoH8CP3YAJdjrfxsWRvJvaxdogtU8aZBEdzou2uYsxQkcOfBkCgHig+b/KU0wN 6DKmpdbo7MOUIF89mF+Rtd3h2YBgROsVx3EkghiSTUuvIYXk4xBAdnx/tdCNoJVhOa PZ3WAV4MRfdgA== Original-Received: from alfajor (unknown [157.52.0.200]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 882DF120778; Thu, 2 Jul 2020 15:38:27 -0400 (EDT) In-Reply-To: <28B19D86-343C-4126-B95F-1F38735F73F2@acm.org> ("Mattias =?UTF-8?Q?Engdeg=C3=A5rd?="'s message of "Thu, 2 Jul 2020 20:01:23 +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:182648 Archived-At: >> Better yet, there's still hope that we change things such that `eq` >> behaves like `eql` on bignums (and maybe also on floats). > Speaking of which, Andrea may be in a good position to provide us with > performance data about such a change, since making 'eq' more expensive is > likely to be more visible in native code (assuming the operation is > open-coded) than in bytecode or interpreted lisp. On the other hand, perhaps > his compiler thingamajig is able to eliminate some checks statically by > type propagation? Note that it can also be done without slowing down `eq` (by hash-consing the bignums). Stefan