Bug #48867 [Opn->Nab]: Casting 0xffffffffffffffff to int does not return -1

Edit report at https://bugs.php.net/bug.php?id=48867&edit=1 ID: 48867 Updated by: leigh@php.net Reported by: magicaltux@php.net Summary: Casting 0xffffffffffffffff to int does not return -1 -Status: Open +Status: Not a bug Type: Bug Package: Scripting Engine problem Operating System: * PHP Version: 5.2.10 Block user comment: N Private report: N New Comment: IEEE 754 rounding issue. The int literal is auto-promoted to float, and due to the loss of precision it really does wrap to 0 when cast back to int Previous Comments: ------------------------------------------------------------------------ [2009-08-01 11:09:19] kalle@php.net This is also cast to 0 on Windows: C:\php\src>uname Windows NT SANDIE 6.0 build 6001 (Windows Vista Ultimate Edition Service Pack 1) i586 ------------------------------------------------------------------------ [2009-07-09 11:51:34] magicaltux@php.net Reproduced on 5.2.9: Kaze ~ # php -v PHP 5.2.9-pl2-gentoo (cli) (built: May 11 2009 19:07:50) (DEBUG) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies Kaze ~ # php -r 'var_dump((int)0xffffffffffffffff);' int(0) Kaze ~ # uname -a Linux Kaze 2.6.29-gentoo-tux #1 SMP PREEMPT Fri Apr 17 00:36:53 CEST 2009 x86_64 Intel(R) Core(TM)2 CPU U7500 @ 1.06GHz GenuineIntel GNU/Linux ------------------------------------------------------------------------ [2009-07-09 11:45:56] c dot robin at smartphp dot org Reproduced on ArchLinux ( both compiled package and custom compiled PHP with no patches ). Uname: Linux devrobin 2.6.30-ARCH #1 SMP PREEMPT Sat Jul 4 02:24:43 CEST 2009 x86_64 Intel(R) Core(TM)2 Duo CPU E7200 @ 2.53GHz GenuineIntel GNU/Linux ------------------------------------------------------------------------ [2009-07-09 11:44:21] magicaltux@php.net uname -a of test machines: Linux Memol.ooKoo.org 2.6.28-gentoo-r3-tux #1 SMP Thu Mar 12 22:09:11 CET 2009 x86_64 Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz GenuineIntel GNU/Linux Linux localhost 2.6.30-gentoo-r1 #1 SMP Tue Jun 30 14:06:51 Local time zone must be set--see zic x86_64 Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz GenuineIntel GNU/Linux ------------------------------------------------------------------------ [2009-07-09 11:40:55] magicaltux@php.net Description: ------------ Casting hexadecimal representation of -1 to int is supposed to return -1 in php. It seems to not reproduce on sunOS. <dsp_> sapi/cli/php -r 'var_dump((int)0xffffffffffffffff);' <dsp_> int(-1) <dsp_> SunOS t2000-010131 5.11 snv_101 sun4v sparc SUNW,Sun-Fire-T200 Solaris It was reproduced on the following distro of Linux: Gentoo, Arch It was also reproduced on a self-compiled version of PHP 5.2.10 Reproduce code: --------------- magicaltux@Memol ~ $ php -r 'var_dump((int)0xffffffffffffffff);' Expected result: ---------------- int(-1) Actual result: -------------- int(0) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=48867&edit=1