From: zoe at uk dot ibm dot com
Operating system: Windows
PHP version: 5CVS-2007-07-30 (snap)
PHP Bug Type: Math related
Bug description: The constant NAN is reported as 0 on Windows build
Description:
------------
The constant NAN is reported as '0' on the Windows binary downloaded from
the snaps.php.net site. The function is correct on Linux.
A colleague built locally (on Windows) from source and got the correct
value for NAN (ie NAN). We stepped through this code (in
basic_functions.c):
PHPAPI double php_get_nan(void)
{
#if HAVE_HUGE_VAL_NAN
return HUGE_VAL + -HUGE_VAL;
#elif defined(__i386__) || defined(_X86_) || defined(ALPHA) ||
defined(_ALPHA) || defined(__alpha)
double val = 0.0;
((php_uint32*)&val)[1] = PHP_DOUBLE_QUIET_NAN_HIGH;
((php_uint32*)&val)[0] = 0;
return val;
#elif HAVE_ATOF_ACCEPTS_NAN
return atof("NAN");
#else
return 0.0/0.0;
#endif
}
and found that the local build goes through the first "if" section, that
is, HAVE_HUGE_VAL_NAN is true. We can't step through the Windows binary we
downloaded but guessing that it's not executing the same section.
Reproduce code:
---------------
<?php
echo "NAN= ";
var_dump(NAN);
?>
Expected result:
----------------
NAN= float(NAN)
Actual result:
--------------
NAN= float(0)
--
Edit bug report at http://bugs.php.net/?id=42143&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=42143&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=42143&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=42143&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=42143&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=42143&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=42143&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=42143&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=42143&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=42143&r=support
Expected behavior: http://bugs.php.net/fix.php?id=42143&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=42143&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=42143&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=42143&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=42143&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=42143&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=42143&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=42143&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=42143&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=42143&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=42143&r=mysqlcfg
