Bug #70568 [NEW]: atan2 returns NAN

From: goodnickoff at gmail dot com Operating system: All PHP version: 5.6.13 Package: Math related Bug Type: Bug Bug description:atan2 returns NAN Description: ------------ If both parameters are INF or -INF sometimes atan2 function returns NAN but sometimes -2.3561944901923. results on different versions of PHP and OS: -2.3561944901923% PHP 5.5.27 (cli) (built: Jul 23 2015 00:21:59) macos 64bit NAN PHP 5.4.39 (cli) (built: Mar 19 2015 22:16:19) Thread Safety enabled Windows NT 6.1 build 7601 (Windows 7 Business Edition Service Pack 1) i586 x86 -2.3561944901923 PHP Version 5.5.21 Build Date Jan 21 2015 14:38:49 Thread Safety enabled Windows NT CZC4433C6H-HP 6.1 build 7601 (Windows 7 Business Edition Service Pack 1) AMD64 NAN PHP 5.6.11 (cli) (built: Jul 9 2015 20:55:40) x86 Thread Safety enabled Windows NT 10.0; Win64; x64 (Build 10240) Test script: --------------- php -r 'echo atan2(-INF, -INF);' Expected result: ---------------- -2.3561944901923 Actual result: -------------- NAN -- Edit bug report at https://bugs.php.net/bug.php?id=70568&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70568&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70568&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70568&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70568&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70568&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70568&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70568&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70568&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70568&r=support Expected behavior: https://bugs.php.net/fix.php?id=70568&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70568&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70568&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70568&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70568&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70568&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70568&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70568&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70568&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70568&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70568&r=mysqlcfg