From: d_kelsey at uk dot ibm dot com
Operating system: Linux 64Bit
PHP version: 5.2CVS-2009-02-17 (CVS)
PHP Bug Type: Scripting Engine problem
Bug description: modulus operator returns incorrect results on 64 bit linux
Description:
------------
on a 64bit system the following
var_dump(1%4294967295);
should return 1, but returns 0.
The problem is in the
ZEND_API int mod_function(...) in zend_operators.c
A call is made to abs which expects a 32bit int and returns a 32bit int,
but 4294967295 is > 32 bits in size so the abs call returns an incorrect
value.
A proposed fix is to change the line
"if (abs(op2->value.lval) == 1) {"
to
"if (op2->value.lval == 1 || op2->value.lval == -1) {"
--
Edit bug report at http://bugs.php.net/?id=47422&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=47422&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=47422&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=47422&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=47422&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=47422&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=47422&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=47422&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=47422&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=47422&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=47422&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=47422&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=47422&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=47422&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=47422&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47422&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=47422&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=47422&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=47422&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=47422&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=47422&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=47422&r=mysqlcfg
