From: David Kastrup <dak@gnu.org>
To: emacs-devel@gnu.org
Subject: Re: integer overflow
Date: Sun, 07 Mar 2010 18:42:45 +0100 [thread overview]
Message-ID: <87tyssxc2y.fsf@lola.goethe.zz> (raw)
In-Reply-To: 87d3zgt5hj.fsf@uwakimon.sk.tsukuba.ac.jp
"Stephen J. Turnbull" <turnbull@sk.tsukuba.ac.jp> writes:
> David Kastrup writes:
> > Richard Stallman <rms@gnu.org> writes:
> >
> > > I have heard that Guile now supports Emacs Lisp. And it has bignums.
> > > So if we make Emacs use Guile, that will automatically provide
> > > bignums.
> >
> > My first reaction to that would be "Whoa, whoa, whoa!".
> >
> > The second that "librep" might be an easier starting point for migrating
> > the Lisp engine.
>
> For bignums, XEmacs or SXEmacs might be easier yet.
But the "Whoa" factor is lost.
> The work of integrating bignums (GNU MP and BSD MP are both supported
> as compile-time options) was done by Jerry James. He is probably
> *not* available any time soon (his day job just turned into a
> day-and-night job) but the pedigree of the code is easily established
> and he and other contributors probably would be willing to sign
> papers.
[...]
> However, this is all kind of irrelevant. Using bignums as pure
> numbers is relatively easy. The hard part is introducing them as
> numerical components of internal Emacs structures (buffer size and
> positions, markers, overlays, text properties), and integrating them
> with niceties like (system-dependent) large file support, etc. This
> is in no way an automatic consequence of language support for bignums.
IIRC, this has not been done in the bignum integration of XEmacs and its
ilk. So there is not much code worth the taking.
Transparent bignums should indeed be easy to do: just check the overflow
of integer arithmetic operations and behave accordingly. Arithmetic now
catering for float and integer would have to cater for bignums as well.
Anyway, I guess that Richard's point more or less was that Emacs' Lisp
engine was worth substituting, and that such a radical move might solve
unrelated problems as well.
bignum support alone indeed should be reasonably straightforward. It
should certainly speed up Emacs calc once Emacs calc is cleaned up to
use it.
--
David Kastrup
next prev parent reply other threads:[~2010-03-07 17:42 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4B8147A9.7030504@gmail.com>
[not found] ` <87ljemdzxo.fsf@stupidchicken.com>
2010-02-23 5:31 ` Next pretest, and branching plans Jason Rumney
2010-02-23 18:29 ` Eli Zaretskii
2010-02-23 21:12 ` Jason Rumney
2010-02-24 6:04 ` Richard Stallman
2010-02-24 13:34 ` Sean Sieger
2010-02-24 15:05 ` Davis Herring
2010-02-24 15:18 ` Sean Sieger
2010-02-24 14:05 ` Chong Yidong
2010-02-25 14:26 ` Richard Stallman
2010-02-26 18:03 ` manuals [was Re: Next pretest, and branching plans] Glenn Morris
2010-02-27 2:32 ` Richard Stallman
2010-02-27 16:52 ` Next pretest, and branching plans Johan Bockgård
2010-03-03 3:52 ` Glenn Morris
2010-03-05 0:31 ` Johan Bockgård
2010-03-05 19:50 ` integer overflow [was Re: Next pretest, and branching plans] Glenn Morris
2010-03-05 22:35 ` integer overflow Stefan Monnier
2010-03-06 2:55 ` Glenn Morris
2010-03-06 3:11 ` Chong Yidong
2010-03-06 7:03 ` Helmut Eller
2010-03-06 15:45 ` Stefan Monnier
2010-03-06 16:23 ` Davis Herring
2010-03-06 16:33 ` Drew Adams
2010-03-07 7:52 ` Richard Stallman
2010-03-07 16:06 ` David Kastrup
2010-03-07 17:18 ` Stephen J. Turnbull
2010-03-07 17:42 ` David Kastrup [this message]
2010-03-08 4:49 ` Jay Belanger
2010-03-08 8:04 ` Richard Stallman
2010-03-08 14:41 ` Guile in Emacs (was: integer overflow) Ted Zlatanov
2010-03-08 17:32 ` Guile in Emacs Ted Zlatanov
2010-03-08 18:42 ` Guile in Emacs (was: integer overflow) Chad Brown
2010-03-09 7:07 ` Ken Raeburn
2010-03-09 16:22 ` Guile in Emacs Ted Zlatanov
2010-03-10 8:07 ` Ken Raeburn
2010-03-10 13:58 ` David Kastrup
2010-03-09 3:19 ` Guile in Emacs (was: integer overflow) Richard Stallman
2010-04-11 23:33 ` Thomas Lord
2010-04-12 12:30 ` Richard Stallman
2010-04-12 20:05 ` Thomas Lord
2010-04-13 12:44 ` Guile in Emacs Bruce Stephens
2010-04-13 15:51 ` Thomas Lord
2010-04-13 16:07 ` Stefan Monnier
2010-04-13 18:56 ` Thomas Lord
2010-04-13 19:22 ` Christian Lynbech
2010-04-14 10:14 ` Bruce Stephens
2010-04-14 14:10 ` joakim
2010-04-13 19:13 ` Christian Lynbech
2010-04-14 1:47 ` Thomas Lord
2010-04-14 3:33 ` Christian Lynbech
2010-04-14 23:33 ` Richard Stallman
2010-04-14 5:02 ` Richard Stallman
2010-04-14 6:45 ` christian.lynbech
2010-04-14 19:07 ` Thomas Lord
2010-04-14 19:34 ` Bruce Stephens
2010-04-14 20:09 ` Jose A. Ortega Ruiz
2010-04-15 7:34 ` christian.lynbech
2010-04-14 23:33 ` Richard Stallman
2010-04-15 3:52 ` Drew Adams
2010-04-15 6:01 ` David Kastrup
2010-04-15 6:54 ` Drew Adams
2010-04-15 11:59 ` Jeff Clough
2010-04-15 12:49 ` christian.lynbech
2010-04-15 13:54 ` Jeff Clough
2010-04-15 14:03 ` Lennart Borgman
2010-04-15 16:13 ` Drew Adams
2010-04-16 13:48 ` Jeff Clough
2010-04-16 14:03 ` christian.lynbech
2010-04-16 14:25 ` Jeff Clough
2010-04-16 14:25 ` Drew Adams
2010-04-16 14:39 ` David Kastrup
2010-04-16 14:40 ` Jeff Clough
2010-04-16 8:27 ` christian.lynbech
2010-04-17 4:41 ` Richard Stallman
2010-04-19 7:52 ` christian.lynbech
2010-04-16 22:29 ` Emacs Info manuals (was: Guile in Emacs) Juri Linkov
2010-04-15 16:11 ` Guile in Emacs Drew Adams
2010-04-15 7:21 ` christian.lynbech
2010-04-15 7:36 ` David Kastrup
2010-04-15 8:34 ` christian.lynbech
2010-04-15 9:06 ` David Kastrup
2010-04-15 9:45 ` Helmut Eller
2010-04-15 10:39 ` christian.lynbech
2010-04-15 18:47 ` Richard Stallman
2010-04-15 22:42 ` Harald Hanche-Olsen
2010-04-15 22:50 ` Harald Hanche-Olsen
2010-04-17 4:40 ` Richard Stallman
2010-04-15 23:02 ` Helmut Eller
2010-04-17 4:40 ` Richard Stallman
2010-04-17 6:46 ` Helmut Eller
2010-04-17 19:55 ` Richard Stallman
2010-04-14 13:30 ` John Wiegley
2010-04-14 14:18 ` Helmut Eller
2010-04-14 15:40 ` Tom Tromey
2010-04-14 7:51 ` David Kastrup
2010-04-14 8:42 ` christian.lynbech
2010-04-14 9:55 ` immanuel litzroth
2010-04-14 10:28 ` christian.lynbech
2010-04-14 11:25 ` Stephen J. Turnbull
2010-04-14 12:26 ` christian.lynbech
2010-04-14 16:49 ` Ken Raeburn
2010-04-14 18:29 ` Tom Tromey
2010-04-14 20:02 ` Ken Raeburn
2010-04-14 11:23 ` Jeff Clough
2010-04-14 13:11 ` Stephen J. Turnbull
2010-04-14 13:11 ` Stephen Eilert
2010-04-14 13:49 ` Helmut Eller
2010-04-14 15:47 ` Tom Tromey
2010-04-14 16:41 ` Drew Adams
2010-04-14 20:10 ` David De La Harpe Golden
2010-04-15 10:38 ` Leo
2010-03-06 19:04 ` integer overflow Helmut Eller
2010-03-06 21:26 ` Stefan Monnier
2010-03-07 7:51 ` Richard Stallman
2010-03-07 19:05 ` Johan Bockgård
2010-03-06 20:35 ` Chong Yidong
2010-03-13 3:10 ` Next pretest, and branching plans Christoph
2010-03-13 7:42 ` Eli Zaretskii
2010-03-13 14:54 ` Christoph
2010-03-13 18:30 ` Stefan Monnier
2010-03-13 19:06 ` Eli Zaretskii
2010-03-14 2:38 ` Jason Rumney
2010-03-14 2:50 ` Christoph
2010-03-14 3:07 ` Jason Rumney
2010-03-14 17:55 ` Eli Zaretskii
2010-03-17 0:29 ` Christoph
2010-03-17 4:14 ` Eli Zaretskii
2010-03-17 12:44 ` Jason Rumney
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