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61 lines
2.5 KiB
C
61 lines
2.5 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2011 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Sascha Schumann <sascha@schumann.cx> |
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| Ard Biesheuvel <ard@ard.nu> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#if defined(__i386__) && defined(__GNUC__)
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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long __tmpvar; \
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__asm__ ("imul %3,%0\n" \
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"adc $0,%1" \
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: "=r"(__tmpvar),"=r"(usedval) \
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: "0"(a), "r"(b), "1"(0)); \
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if (usedval) (dval) = (double) (a) * (double) (b); \
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else (lval) = __tmpvar; \
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} while (0)
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#elif SIZEOF_LONG == 4 && defined(HAVE_ZEND_LONG64)
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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zend_long64 __result = (zend_long64) (a) * (zend_long64) (b); \
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if (__result > LONG_MAX || __result < LONG_MIN) { \
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(dval) = (double) __result; \
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(usedval) = 1; \
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} else { \
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(lval) = (long) __result; \
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(usedval) = 0; \
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} \
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} while (0)
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#else
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#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do { \
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long __lres = (a) * (b); \
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long double __dres = (long double)(a) * (long double)(b); \
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long double __delta = (long double) __lres - __dres; \
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if ( ((usedval) = (( __dres + __delta ) != __dres))) { \
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(dval) = __dres; \
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} else { \
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(lval) = __lres; \
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} \
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} while (0)
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#endif
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