GNU bug report logs - #16283
24.2; Built-in function * , used for calculating product, gives wrong output

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mohammed Sami <abdussami101 <at> gmail.com>
Subject: bug#16283: closed (Re: bug#16283: 24.2; Built-in function * ,
 used for calculating product, gives wrong output)
Date: Sat, 28 Dec 2013 18:53:02 +0000

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Your bug report

#16283: 24.2; Built-in function * , used for calculating product, gives wrong output

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 16283 <at> debbugs.gnu.org.

-- 
16283: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16283
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Mohammed Sami <abdussami101 <at> gmail.com>
Cc: 16283-done <at> debbugs.gnu.org
Subject: Re: bug#16283: 24.2;
 Built-in function * , used for calculating product, gives wrong output
Date: Sat, 28 Dec 2013 20:52:02 +0200

> From: Mohammed Sami <abdussami101 <at> gmail.com>
> Date: Sat, 28 Dec 2013 23:45:38 +0530
> 
> After starting window Emacs with "emacs -q", when I evaluate (* 1024 1024
> 1024 1024), I get 0.
> (* 1024 1024) works correctly, but repeating '1024' more than two times
> gives wrong value.

A 32-bit build of Emacs cannot correctly do integer math beyond the
value of most-positive-fixnum, whose value is 536870911.  This is a
fundamental limitation of Emacs Lisp, not a bug.

You can work around this bu using floating-point numbers:

  (* 1024.0 1024.0 1024.0) => 1073741824.0

Closing.

[Message part 3 (message/rfc822, inline)]

From: Mohammed Sami <abdussami101 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.2; Built-in function * , used for calculating product, gives wrong
 output
Date: Sat, 28 Dec 2013 23:45:38 +0530

[Message part 4 (text/plain, inline)]

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

After starting window Emacs with "emacs -q", when I evaluate (* 1024 1024
1024 1024), I get 0.
(* 1024 1024) works correctly, but repeating '1024' more than two times
gives wrong value.

In GNU Emacs 24.2.1 (i386-mingw-nt5.1.2600)
 of 2012-08-29 on MARVIN
Windowing system distributor `Microsoft Corp.', version 5.1.2600
Configured using:
 `configure --with-gcc (4.6) --cflags
 -ID:/devel/emacs/libs/libXpm-3.5.8/include
 -ID:/devel/emacs/libs/libXpm-3.5.8/src
 -ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
 -ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
 -ID:/devel/emacs/libs/giflib-4.1.4-1/include
 -ID:/devel/emacs/libs/jpeg-6b-4/include
 -ID:/devel/emacs/libs/tiff-3.8.2-1/include
 -ID:/devel/emacs/libs/gnutls-3.0.9/include'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x b s c <return> M-< M-> ( * SPC 1 0 2 4 SPC 1 0
2 4 SPC 1 0 2 4 SPC 1 0 2 4 ) C-u C-x C-e <help-echo>
<return> M-x r e p o r t <tab> <return>



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