From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Richard Stallman Newsgroups: gmane.emacs.devel Subject: Re: Emacs Lisp JIT Compiler Date: Mon, 13 Aug 2018 19:31:21 -0400 Message-ID: References: <87va8ej4o1.fsf@tromey.com> Reply-To: rms@gnu.org NNTP-Posting-Host: blaine.gmane.org Content-Type: text/plain; charset=Utf-8 X-Trace: blaine.gmane.org 1534203024 30105 195.159.176.226 (13 Aug 2018 23:30:24 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 13 Aug 2018 23:30:24 +0000 (UTC) Cc: emacs-devel@gnu.org To: Tom Tromey Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Aug 14 01:30:20 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fpMI0-0007kX-HZ for ged-emacs-devel@m.gmane.org; Tue, 14 Aug 2018 01:30:20 +0200 Original-Received: from localhost ([::1]:41792 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpMK7-0001ML-28 for ged-emacs-devel@m.gmane.org; Mon, 13 Aug 2018 19:32:31 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:39187) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpMJF-0001L4-6x for emacs-devel@gnu.org; Mon, 13 Aug 2018 19:31:38 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fpMJD-0000dH-D8 for emacs-devel@gnu.org; Mon, 13 Aug 2018 19:31:37 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:33521) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fpMJ0-0000Lt-81; Mon, 13 Aug 2018 19:31:22 -0400 Original-Received: from rms by fencepost.gnu.org with local (Exim 4.82) (envelope-from ) id 1fpMIz-0003on-M8; Mon, 13 Aug 2018 19:31:21 -0400 In-Reply-To: <87va8ej4o1.fsf@tromey.com> (message from Tom Tromey on Sun, 12 Aug 2018 22:01:34 -0600) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:228507 Archived-At: [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] To replace an interpreter by a JIT compiler means more oomplexity and also more possible problems. (For example, if there are platforms someday that libjit does not support.) Reading a Lisp interpreter is very useful for learning. If the plan is to add a jit and keep the Lisp interpreter as well, we don't lose its advantages for study, and we can still support all the platforms -- but we add complexity even more. I don't think a 3% speedup is worth those drawbacks. Or even a 10% speedup. A really big speedup would justify the costs. -- Dr Richard Stallman President, Free Software Foundation (https://gnu.org, https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org)