From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Richard Stallman <rms@gnu.org>
Cc: akrl@sdf.org, stefan@marxist.se, drew.adams@oracle.com,
emacs-devel@gnu.org
Subject: Re: "Bringing GNU Emacs to Native Code" at the European Lisp Symposium
Date: Sat, 02 May 2020 09:43:46 -0400 [thread overview]
Message-ID: <jwvftcisbof.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1jUhmh-0005dp-8L@fencepost.gnu.org> (Richard Stallman's message of "Fri, 01 May 2020 22:21:43 -0400")
> None of that applies to a compiler. Any compiler that transforms Emacs Lisp
> into something else must be able to deal with dynamic binding.
AFAIK it does *handle* such code (i.e. such code will run correctly), it
just doesn't optimize it (in this particular case it keeps it in `.elc` form).
> So there is no reason it should have trouble with dynamic binding
> mode, that only means it is not finished.
That's partly right. But then again, there's always something else that
can be optimized. You have to prioritize. I think it's perfectly OK to
say that if you want higher performance you should start by adapting
your Elisp/d code to Elisp/l, especially since the compiler will be able
to do a much better job with Elisp/l than Elisp/d since when compiled
via libggcjit, a lexical variable will turn into (more or less) a plain
normal C variable whereas a dynamic variable will only be accessed via
the standard `symbol-value`, `set`, ... accessors. For this reason, on
Elisp/d the native compiler won't be able to get much more speed up than
that resulting from removing the while+switch interpretive overhead,
whereas on Elisp/l it can go significantly further by allocating
variables to registers, removing type tests, boxing/unboxing pairs, ...
Stefan
next prev parent reply other threads:[~2020-05-02 13:43 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-28 17:11 "Bringing GNU Emacs to Native Code" at the European Lisp Symposium Stefan Kangas
2020-04-28 19:25 ` Andrea Corallo
2020-04-28 19:35 ` Amin Bandali
2020-04-28 20:06 ` Andrea Corallo
2020-04-28 21:13 ` Amin Bandali
2020-04-29 3:24 ` Richard Stallman
2020-04-29 18:47 ` Andrea Corallo
2020-04-28 19:36 ` tomas
2020-04-28 22:00 ` Drew Adams
2020-04-28 22:18 ` Stefan Monnier
2020-04-28 22:51 ` Drew Adams
2020-04-29 7:04 ` Eli Zaretskii
2020-04-29 12:38 ` Stefan Monnier
2020-04-29 14:02 ` Eli Zaretskii
2020-04-28 22:38 ` Dmitry Gutov
2020-04-29 10:55 ` Andrea Corallo
2020-04-29 15:35 ` Drew Adams
2020-04-29 18:57 ` Andrea Corallo
2020-04-29 19:29 ` Drew Adams
2020-04-30 1:14 ` Stefan Monnier
2020-04-30 2:27 ` Richard Stallman
2020-04-30 3:00 ` Stefan Monnier
2020-05-02 2:21 ` Richard Stallman
2020-05-02 13:43 ` Stefan Monnier [this message]
2020-04-30 20:32 ` Andrea Corallo
2020-05-02 2:27 ` Richard Stallman
2020-05-02 9:48 ` Andrea Corallo
2020-05-03 3:44 ` Richard Stallman
2020-05-03 4:28 ` Stefan Monnier
2020-05-04 3:09 ` Richard Stallman
2020-05-04 5:17 ` Stefan Monnier
2020-05-05 2:56 ` Richard Stallman
2020-05-05 3:18 ` Stefan Monnier
2020-05-04 10:07 ` Andrea Corallo
2020-05-02 13:50 ` Stefan Monnier
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