/* fixed_sqrt_uf248.c */
/* avr.math.fixed - Fixed point math module. {{{
*
* Copyright (C) 2005 Nicolas Schodet
*
* Robot APB Team/Efrei 2006.
* Web: http://assos.efrei.fr/robot/
* Email: robot AT efrei DOT fr
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* }}} */
#include "common.h"
#include "fixed.h"
/** Compute square root, uf24.8. */
uint32_t
fixed_sqrt_uf248 (uint32_t x)
{
uint32_t root, bit, test;
root = 0;
bit = 1L << 30;
do
{
test = root + bit;
if (x >= test)
{
x -= test;
root = test + bit;
}
root >>= 1;
bit >>= 2;
} while (bit);
return root << 4;
}