#39680 [Bgs->Opn]: Type Casting from float into int

ID: 39680 User updated by: diefans at googlemail dot com Reported By: diefans at googlemail dot com -Status: Bogus +Status: Open Bug Type: *Math Functions Operating System: Linux PHP Version: 5.2.0 New Comment: I tested (compiled PHP 5.2.0) the DVAL_TO_LVAL macro (in Zend/zend_operators.c) from version 5.1.4 and could reproduce expected values. So the DVAL_TO_LVAL macro from version 5.2.0 performs not equal as in 5.1.4 #define DVAL_TO_LVAL(d, l) (l) = (d) > LONG_MAX ? (unsigned long) (d) : (long) (d) please check this issue, if it is intended to be there - Previous Comments: ------------------------------------------------------------------------ [2006-11-29 12:21:22] diefans at googlemail dot com So all versions prior 5.2.0 are buggy - right? ------------------------------------------------------------------------ [2006-11-29 11:30:22] tony2001@php.net The logic behind this conversion is quite plain: if (double > LONG_MAX) { long = (unsigned long) double; } else { long = (long) double; } You can try to compile a simple program in C and see that the result is the same. ------------------------------------------------------------------------ [2006-11-29 10:19:36] diefans at googlemail dot com Description: ------------ since version 5.2.0 when I cast a negative float smaller than -2147483648 into an int all bits are lost and the minimum Integer value is returned. For positive floats larger than the max integer value all is fine. It is not possible to perform bitwise calculations with negative overflowing values since all usable information is lost. Reproduce code: --------------- echo (int) -40000000000; echo (int) 40000000000; Expected result: ---------------- -1345294336 1345294336 Actual result: -------------- -2147483648 1345294336 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=39680&edit=1