Bug #70568 [Com]: atan2 returns NAN

Edit report at https://bugs.php.net/bug.php?id=70568&edit=1 ID: 70568 Comment by: n13 at inbox dot ru Reported by: goodnickoff at gmail dot com Summary: atan2 returns NAN Status: Open Type: Bug Package: Math related Operating System: * PHP Version: * Block user comment: N Private report: N New Comment: GCC 4.8.1 from MinGW and VS Community 2013 gives the same result Code: printf("%lf\n",atan2(-INFINITY,-INFINITY)); printf("%lf\n",atan2(+INFINITY,-INFINITY)); printf("%lf\n",atan2(-INFINITY,+INFINITY)); printf("%lf\n",atan2(+INFINITY,+INFINITY)); Output: -1.#IND00 -1.#IND00 -1.#IND00 -1.#IND00 Output from gcc 4.9.2 (Debian) -2.356194 2.356194 -0.785398 0.785398 Previous Comments: ------------------------------------------------------------------------ [2015-09-24 12:05:16] goodnickoff at gmail dot com This happens on 32 bit php installed on 64 bit OS. ------------------------------------------------------------------------ [2015-09-24 09:24:02] goodnickoff at gmail dot com Occurs on different versions of PHP ------------------------------------------------------------------------ [2015-09-24 08:59:29] goodnickoff at gmail dot com 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 this bug report at https://bugs.php.net/bug.php?id=70568&edit=1