From: php at milonic dot com
Operating system: Fedora/Linux 9
PHP version: 4.3.10
PHP Bug Type: Math related
Bug description: Incorrect Values Returned
Description:
------------
Values returned using the following code produce different results
(incorrect) in PHP-4.3.10 and PHP-4.3.9 on Fedora Core 3.
When the same code is executed on a Linux 9 or FreeBSD5.3 machine the
values are correct.
Could be a Fedora problem but thought you'd like to take a look.
Reproduce code:
---------------
<?
function fillZeros($a, $b){
$z = hexdec(80000000);
if ($z & $a){
$a = ($a>>1);
$a &= (~$z);
$a |= 0x40000000;
$a = ($a>>($b-1));
}
else{
$a = ($a>>$b);
}
return $a;
}
function mixture($a,$b,$c)
{
$a -= $b; $a -= $c; $a ^= (fillZeros($c,13));
$b -= $c; $b -= $a; $b ^= ($a<<8);
$c -= $a; $c -= $b; $c ^= (fillZeros($b,13));
$a -= $b; $a -= $c; $a ^= (fillZeros($c,12));
$b -= $c; $b -= $a; $b ^= ($a<<16);
$c -= $a; $c -= $b; $c ^= (fillZeros($b,5));
$a -= $b; $a -= $c; $a ^= (fillZeros($c,3));
$b -= $c; $b -= $a; $b ^= ($a<<10);
$c -= $a; $c -= $b; $c ^= (fillZeros($b,15));
return array($a,$b,$c);
}
$test= mixture("11", "22", "33");
echo "$test[0], $test[1], $test[2]\n";
?>
Expected result:
----------------
Should be:
251066875, -1654377486, -1500734959
Actual result:
--------------
But instead get:
251066875, 1541925888, -402039036
Only happens on Fedora, all other boxes are fine.
--
Edit bug report at http://bugs.php.net/?id=31569&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=31569&r=trysnapshot4
Try a CVS snapshot (php5.0):
http://bugs.php.net/fix.php?id=31569&r=trysnapshot50
Try a CVS snapshot (php5.1):
http://bugs.php.net/fix.php?id=31569&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=31569&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=31569&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=31569&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=31569&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=31569&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=31569&r=support
Expected behavior: http://bugs.php.net/fix.php?id=31569&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=31569&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=31569&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=31569&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=31569&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=31569&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=31569&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=31569&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=31569&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=31569&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=31569&r=mysqlcfg
