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? 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logging-data="3306"; 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 19:43:11 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 1jsrcd-0000ie-C6 for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 07 Jul 2020 19:43:11 +0200 Original-Received: from localhost ([::1]:38756 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jsrcc-0002VQ-Aw for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 07 Jul 2020 13:43:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55980) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jsrcU-0002VG-Md for bug-gnu-emacs@gnu.org; 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Tue, 7 Jul 2020 17:42:17 +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:182810 Archived-At: Mattias Engdeg=C3=A5rd writes: > 7 juli 2020 kl. 18.24 skrev Andrea Corallo : > >> Sure I'm.=C2=A0 The native compiler does it already but I'm curious to s= ee >> how you do it at source level and how generic it is. > > Not very, but doing it at source level has some advantages since it can e= nable other source-level transformations. > It's mainly a proof of concept -- for simplicity, it doesn't attempt to b= e overly clever in the face of loops or setq. > > One snag is that because Emacs inline functions (defsubst) are inlined > as bytecode, they are usually not amenable to source optimisations. It > is only when a defsubst is imported from a different .el file that has > not yet been byte-compiled that it is integrated as source, and then > the machinery in this patch will nicely propagate constant arguments > into the body. Well loops and setq without CFG IMO are likely to be difficult if not impossible to optimize in a generic way.=C2=A0 But I agree that having a simple optimization done earlier is always better given it can benefit other ones. =C2=A0 Andrea