#45278 [Com]: round is not working consitently on 64bit
| From: | kontakt at jandreger dot de | Date: | Thu, 19 Jun 2008 10:03:20 +0000 |
| Subject: | #45278 [Com]: round is not working consitently on 64bit | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-125882@lists.php.net to get a copy of this message | ||
ID: 45278
Comment by: kontakt at jandreger dot de
Reported By: kelfe at gmx dot de
Status: Open
Bug Type: Math related
Operating System: Gentoo64
PHP Version: 5.2.6
New Comment:
I can confirm this bug.
Server1: (Intel Celeron 2GHz)
=============================================
p123:~ # uname -a
Linux p123 2.6.24.7-20080507a #1 SMP Wed May 7 10:10:41 CEST 2008 i686
i686 i386 GNU/Linux
p123:~ # php -r 'for($i=0;$i<20;$i++) echo round($i+0.015,2)."\n";'
0.02
1.02
2.02
3.02
4.02
5.02
6.02
7.02
8.02
9.02
10.02
11.02
12.02
13.02
14.02
15.02
16.02
17.02
18.02
19.02
p123:~ # php -v
PHP 5.2.5 with Suhosin-Patch 0.9.6.2 (cli) (built: Jan 14 2008
17:07:09)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
Server2: (Dual-Core AMD Opteron(tm) Processor 1216 HE)
============================================================
s456:~ # uname -a
Linux s456 2.6.24.7-20080507a #1 SMP Wed May 7 10:13:12 CEST 2008
x86_64 x86_64 x86_64 GNU/Linux
s1456:~ # php -v
PHP 5.2.0 with Suhosin-Patch 0.9.6.1 (cli) (built: Jul 30 2007
15:36:44)
Copyright (c) 1997-2006 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2006 Zend Technologies
with the ionCube PHP Loader v3.1.28, Copyright (c) 2002-2007, by
ionCube Ltd.
s456:~ # php -r 'for($i=0;$i<20;$i++) echo round($i+0.015,2)."\n";'
0.02
1.01
2.02
3.02
4.01
5.01
6.02
7.02
8.02
9.02
10.02
11.02
12.02
13.02
14.02
15.02
16.02
17.02
18.02
19.02
Notebook( Intel(R) Pentium(R) M processor 2.13GHz)
===========================================
asd:~$ php -v
PHP 5.2.4-2ubuntu5.1 with Suhosin-Patch 0.9.6.2 (cli) (built: May 9
2008 16:34:16)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
asd:~$ uname -a
Linux asd 2.6.24-19-generic #1 SMP Wed Jun 4 16:35:01 UTC 2008 i686
GNU/Linux
asd:~$ php -r 'for($i=0;$i<20;$i++) echo round($i+0.015,2)."\n";'
0.02
1.01
2.02
3.02
4.01
5.01
6.02
7.02
8.02
9.02
10.02
11.02
12.02
13.02
14.02
15.02
16.02
17.02
18.02
19.02
Previous Comments:
------------------------------------------------------------------------
[2008-06-16 10:20:20] kelfe at gmx dot de
Description:
------------
the demo code procduces the expected results on a gentoo 32 bit install
(amd 2400+) dev-lang/php-5.2.6-r1
but fails with the actual results on a 64bit install (intel xeon) from
the same ebuild
the error can reproduced on an older ubuntu PHP 5.2.3 running 64bit as
well
the loop and sum was only added to reduce the code (could do 20 round
of the calculated values as well for the same result)
Reproduce code:
---------------
php -r 'for($i=0;$i<20;$i++) echo round($i+0.015,2)."\n";'
Expected result:
----------------
0.02
1.02
2.02
3.02
4.02
5.02
6.02
7.02
8.02
9.02
10.02
11.02
12.02
13.02
14.02
15.02
16.02
17.02
18.02
19.02
Actual result:
--------------
0.02
1.01
2.02
3.02
4.01
5.01
6.02
7.02
8.02
9.02
10.02
11.02
12.02
13.02
14.02
15.02
16.02
17.02
18.02
19.02
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=45278&edit=1