From: Helmut Eller <eller.helmut@gmail.com>
To: emacs-devel@gnu.org
Subject: Re: indirect threading for bytecode interpreter
Date: Thu, 17 Sep 2009 21:20:31 +0200 [thread overview]
Message-ID: <m2hbv1l6o0.fsf@gmail.com> (raw)
In-Reply-To: m3ab0tldsb.fsf@fleche.redhat.com
* Tom Tromey [2009-09-17 18:46+0200] writes:
> This patch implements indirect threading for the Emacs bytecode
> interpreter. It uses a GNU C extension, and falls back to the current
> switch-based code if Emacs is compiled with some other compiler.
According to the usual Forth terminology
http://en.wikipedia.org/wiki/Threaded_code
your patch implements token threading not indirect threading.
[Indirect threading uses pointers (to Forth-style "word headers") which
contain the address of the machine code. There are no such pointers in
your patch. At the machine code level, token threaded code uses a
"token" as index in a table. That's what your code is doing. Unlike
token threaded code, indirect threaded code is typically not position
independent.]
Despite that, a few years ago somebody has already proposed that
http://lists.gnu.org/archive/html/emacs-devel/2004-05/msg00095.html
and it wasn't deemed worthwhile back then.
Helmut
next prev parent reply other threads:[~2009-09-17 19:20 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-17 16:46 indirect threading for bytecode interpreter Tom Tromey
2009-09-17 18:21 ` Stefan Monnier
2009-09-17 19:20 ` Helmut Eller [this message]
2009-09-17 19:38 ` Tom Tromey
2009-09-17 20:41 ` Helmut Eller
2009-09-17 21:06 ` Tom Tromey
2009-09-17 22:48 ` Helmut Eller
2009-09-18 0:59 ` Stefan Monnier
2009-09-18 2:59 ` Tom Tromey
2009-09-17 20:43 ` Stefan Monnier
2009-09-17 20:57 ` Tom Tromey
2009-09-18 19:15 ` Dan Nicolaescu
2009-09-18 20:26 ` Tom Tromey
2009-09-21 1:58 ` Dan Nicolaescu
2009-09-21 3:17 ` Tom Tromey
2009-09-21 13:13 ` Stefan Monnier
2009-09-21 13:21 ` David Kastrup
2009-09-21 13:47 ` joakim
2009-09-21 14:46 ` Stefan Monnier
2009-09-21 14:27 ` Tom Tromey
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