2 * Copyright Droids Corporation, Microb Technology, Eirbot (2005)
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 * Revision : $Id: f64_mul.c,v 1.5.4.2 2008-05-10 15:06:26 zer0 Exp $
24 #include <s64_to_f64.h>
27 /* about 300 us with a 16 Mhz quartz on an atm128 */
28 f64 f64_mul(f64 a, f64 b)
30 return s64_to_f64( ( ((int64_t)(a.f64_integer) * (int64_t)(b.f64_integer)) << 32 ) +
31 (int64_t)(a.f64_integer) * (int64_t)(b.f64_decimal) +
32 (int64_t)(a.f64_decimal) * (int64_t)(b.f64_integer) +
33 ( ((int64_t)(a.f64_decimal) * (int64_t)(b.f64_decimal)) >> 32 ) );