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    1: /*
    2:    +----------------------------------------------------------------------+
    3:    | Zend Engine                                                          |
    4:    +----------------------------------------------------------------------+
    5:    | Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
    6:    +----------------------------------------------------------------------+
    7:    | This source file is subject to version 2.00 of the Zend license,     |
    8:    | that is bundled with this package in the file LICENSE, and is        |
    9:    | available through the world-wide-web at the following url:           |
   10:    | http://www.zend.com/license/2_00.txt.                                |
   11:    | If you did not receive a copy of the Zend license and are unable to  |
   12:    | obtain it through the world-wide-web, please send a note to          |
   13:    | license@zend.com so we can mail you a copy immediately.              |
   14:    +----------------------------------------------------------------------+
   15:    | Authors: Sascha Schumann <sascha@schumann.cx>                        |
   16:    |          Ard Biesheuvel <ard@ard.nu>                                 |
   17:    +----------------------------------------------------------------------+
   18: */
   19: 
   20: /* $Id: zend_multiply.h,v 1.1.1.1 2012/02/21 23:47:52 misho Exp $ */
   21: 
   22: #if defined(__i386__) && defined(__GNUC__)
   23: 
   24: #define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do {	\
   25: 	long __tmpvar; 													\
   26: 	__asm__ ("imul %3,%0\n"											\
   27: 		"adc $0,%1" 												\
   28: 			: "=r"(__tmpvar),"=r"(usedval) 							\
   29: 			: "0"(a), "r"(b), "1"(0));								\
   30: 	if (usedval) (dval) = (double) (a) * (double) (b);				\
   31: 	else (lval) = __tmpvar;											\
   32: } while (0)
   33: 
   34: #elif SIZEOF_LONG == 4 && defined(HAVE_ZEND_LONG64)
   35: 
   36: #define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do {	\
   37: 	zend_long64 __result = (zend_long64) (a) * (zend_long64) (b);	\
   38: 	if (__result > LONG_MAX || __result < LONG_MIN) {				\
   39: 		(dval) = (double) __result;									\
   40: 		(usedval) = 1;												\
   41: 	} else {														\
   42: 		(lval) = (long) __result;									\
   43: 		(usedval) = 0;												\
   44: 	}																\
   45: } while (0)
   46: 
   47: #else
   48: 
   49: #define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do {		\
   50: 	long   __lres  = (a) * (b);											\
   51: 	long double __dres  = (long double)(a) * (long double)(b);							\
   52: 	long double __delta = (long double) __lres - __dres;							\
   53: 	if ( ((usedval) = (( __dres + __delta ) != __dres))) {				\
   54: 		(dval) = __dres;												\
   55: 	} else {															\
   56: 		(lval) = __lres;												\
   57: 	}																	\
   58: } while (0)
   59: 
   60: #endif