Bug #70568 [Fbk->NoF]: atan2 returns NAN

Edit report at https://bugs.php.net/bug.php?id=70568&edit=1 ID: 70568 Updated by: php-bugs@lists.php.net Reported by: goodnickoff at gmail dot com Summary: atan2 returns NAN -Status: Feedback +Status: No Feedback Type: Bug Package: Math related Operating System: * PHP Version: * Assigned To: cmb Private report: N New Comment: No feedback was provided. The bug is being suspended because we assume that you are no longer experiencing the problem. If this is not the case and you are able to provide the information that was requested earlier, please do so and change the status of the bug back to "Re-Opened". Thank you. Previous Comments: ------------------------------------------------------------------------ [2018-03-17 17:47:40] cmb@php.net This issue appears to be indeed related to the C compiler or the runtime environment. I'm not convinced that we should apply a workaround similar to the one in the supplied patch, especially, since the issue appears to have been resolved for MSVC 14 and 15 at least. Can anybody else reproduce the described misbehavior with supported PHP versions on contemporary compilers/runtimes? ------------------------------------------------------------------------ [2015-09-30 20:51:50] n13 at inbox dot ru 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 ------------------------------------------------------------------------ [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