/*
   +----------------------------------------------------------------------+
   | HipHop for PHP                                                       |
   +----------------------------------------------------------------------+
   | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   | Copyright (c) 1998-2010 Zend Technologies Ltd. (http://www.zend.com) |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
*/
#ifndef incl_HPHP_ZEND_MULTIPLY_H_
#define incl_HPHP_ZEND_MULTIPLY_H_

#if (defined(__x86_64__) || defined(__i386__)) && defined(__GNUC__)

#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do {       \
    long __tmpvar;                                                      \
    __asm__ ("imul %3,%0\n"                                             \
             "adc $0,%1"                                                \
             : "=r"(__tmpvar),"=r"(usedval)                             \
             : "0"(a), "r"(b), "1"(0));                                 \
    if (usedval) (dval) = (double) (a) * (double) (b);                  \
    else (lval) = __tmpvar;                                             \
  } while (0)

#else

#define ZEND_SIGNED_MULTIPLY_LONG(a, b, lval, dval, usedval) do {       \
    long   __lres  = (a) * (b);                                         \
    long double __dres  = (long double)(a) * (long double)(b);          \
    long double __delta = (long double) __lres - __dres;                \
    if ( ((usedval) = (( __dres + __delta ) != __dres))) {              \
      (dval) = __dres;                                                  \
    } else {                                                            \
      (lval) = __lres;                                                  \
    }                                                                   \
  } while (0)

#endif

#endif // incl_HPHP_ZEND_MULTIPLY_H_
