From: Chong Yidong <cyd@stupidchicken.com>
To: Glenn Morris <rgm@gnu.org>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
Subject: Re: integer overflow
Date: Fri, 05 Mar 2010 22:11:35 -0500 [thread overview]
Message-ID: <873a0euot4.fsf@stupidchicken.com> (raw)
In-Reply-To: <3vsk8ecg6a.fsf@fencepost.gnu.org> (Glenn Morris's message of "Fri, 05 Mar 2010 21:55:25 -0500")
Glenn Morris <rgm@gnu.org> writes:
> I don't really understand it. In a 32-bit Emacs:
>
> (1+ 536870911) -536870912
> (+ 2 536870911) -536870911
> (1+ 536870912) 536870913.0
> (1+ 4294967295) overflow
> (1+ 4294967295.0) 4294967296.0
>
> Can you summarize how it's supposed to work?
The change affects the Lisp reader: reading "536870912" or any larger
number now gives you a float Lisp object, instead of an integer Lisp
object (since there is no way to represent 536870912 or larger as
integers). 536870911 and below are still read as integers.
The change does not prevent the possibility of overflowing integers, as
your example shows.
next prev parent reply other threads:[~2010-03-06 3:11 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 [this message]
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
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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