ID: 43487 Comment by: oeriksson at mandriva dot com Reported By: jm at wo dot cz Status: Open Bug Type: Strings related Operating System: Linux PHP Version: 5.2.5 New Comment:
Update; taken from our bugzilla: "as peroyvind found, the miscompilation is inside Zend/zend_strtod.c, and -no-ftree-vrp workaround the bug." Previous Comments: ------------------------------------------------------------------------ [2008-01-30 19:41:18] oeriksson at mandriva dot com I think I found the problem. On Mandriva Linux Cooker we are using: gcc (GCC) 4.2.2 20071128 (prerelease) (4.2.2-2mdv2008.1) glibc-2.7-1mdv2008.1 If I change the optimization from -O2 to -O0 (-O+zero) the bug goes away on x86_32. ------------------------------------------------------------------------ [2008-01-28 21:30:37] jm at wo dot cz The CVS snapshot makes no difference, still getting the same incorrect strings. [EMAIL PROTECTED] ~]$ php -n -r '$f=array(1E-4, 1E-5, 1E-6, 1E-7, 1E-8); foreach ($f as $fval) echo $fval, "\n";' 0.0001 1.0E-5 :.0E-7 :.0E-8 1.0E-8 [EMAIL PROTECTED] ~]$ php -v PHP 5.2.6-dev (cli) (built: Jan 28 2008 16:13:46) Copyright (c) 1997-2008 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies Previous poster suggested a CPU-related issue. I have encountered this issue on the following CPUs: vendor_id : AuthenticAMD cpu family : 15 model : 5 model name : AMD Opteron(tm) Processor 248 stepping : 8 cpu MHz : 2205.074 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.80GHz stepping : 6 cpu MHz : 1800.000 vendor_id : AuthenticAMD cpu family : 15 model : 37 model name : AMD Opteron(tm) Processor 252 stepping : 1 cpu MHz : 2606.078 ------------------------------------------------------------------------ [2008-01-28 07:59:48] oeriksson at mandriva dot com I get the same problem, but it seems related to what CPU is used. http://qa.mandriva.com/show_bug.cgi?id=37171 $ uname -a Linux foo.nux.se 2.6.24-server-0.rc8.2mdv #1 SMP Wed Jan 23 17:15:33 UTC 2008 i686 Intel(R) Pentium(R) 4 CPU 2.80GHz GNU/Linux $ php -r "var_dump(11.1/111);" float(0.0:) $ uname -a Linux oe.nux.tld 2.6.24-desktop-0.rc8.2mdv #1 SMP Wed Jan 23 18:12:45 CET 2008 x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ GNU/Linux $ php -r "var_dump(11.1/111);" float(0.1) It works with 5.1.6 though. ------------------------------------------------------------------------ [2008-01-26 01:12:23] [EMAIL PROTECTED] Please try using this CVS snapshot: http://snaps.php.net/php5.2-latest.tar.gz For Windows (zip): http://snaps.php.net/win32/php5.2-win32-latest.zip For Windows (installer): http://snaps.php.net/win32/php5.2-win32-installer-latest.msi ------------------------------------------------------------------------ [2008-01-16 09:20:36] lmalgras at tennaxia dot com I have the same problem with PHP 5.2.4 on Linux Reproduce code: --------------- php -n -r '$f=array(1E-4, 1E-5, 1E-6, 1E-7, 1E-8); foreach($f as $fval) echo $fval, "\n";' Expected result: ---------------- 0.0001 1.0E-5 1.0E-6 1.0E-7 1.0E-8 Actual result: -------------- 0.0001 1.0E-5 :.0E-7 :.0E-8 1.0E-8 I have test this code on several configurations with the following results : PHP 5.2.0 (Linux) : Actual result PHP 5.2.2 (Linux) : Actual result PHP 5.2.3 (Windows): Actual result ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/43487 -- Edit this bug report at http://bugs.php.net/?id=43487&edit=1
