xref: /PHP-5.4/Zend/zend_multiply.h (revision c0d060f5)
1 /*
2    +----------------------------------------------------------------------+
3    | Zend Engine                                                          |
4    +----------------------------------------------------------------------+
5    | Copyright (c) 1998-2014 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 /* $Id$ */
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 defined(__x86_64__) && defined(__GNUC__)
35 
36 #define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do {	\
37 	long __tmpvar; 													\
38 	__asm__ ("imul %3,%0\n"											\
39 		"adc $0,%1" 												\
40 			: "=r"(__tmpvar),"=r"(usedval) 							\
41 			: "0"(a), "r"(b), "1"(0));								\
42 	if (usedval) (dval) = (double) (a) * (double) (b);				\
43 	else (lval) = __tmpvar;											\
44 } while (0)
45 
46 #elif SIZEOF_LONG == 4 && defined(HAVE_ZEND_LONG64)
47 
48 #define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do {	\
49 	zend_long64 __result = (zend_long64) (a) * (zend_long64) (b);	\
50 	if (__result > LONG_MAX || __result < LONG_MIN) {				\
51 		(dval) = (double) __result;									\
52 		(usedval) = 1;												\
53 	} else {														\
54 		(lval) = (long) __result;									\
55 		(usedval) = 0;												\
56 	}																\
57 } while (0)
58 
59 #else
60 
61 #define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do {		\
62 	long   __lres  = (a) * (b);											\
63 	long double __dres  = (long double)(a) * (long double)(b);							\
64 	long double __delta = (long double) __lres - __dres;							\
65 	if ( ((usedval) = (( __dres + __delta ) != __dres))) {				\
66 		(dval) = __dres;												\
67 	} else {															\
68 		(lval) = __lres;												\
69 	}																	\
70 } while (0)
71 
72 #endif
73