/*
* Copyright 2011 Linaro Limited
* Aneesh V
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
static void do_cancel_out(u32 *num, u32 *den, u32 factor)
{
while (1) {
if (((*num)/factor*factor == (*num)) &&
((*den)/factor*factor == (*den))) {
(*num) /= factor;
(*den) /= factor;
} else
break;
}
}
/*
* Cancel out the denominator and numerator of a fraction
* to get smaller numerator and denominator.
*/
void cancel_out(u32 *num, u32 *den, u32 den_limit)
{
do_cancel_out(num, den, 2);
do_cancel_out(num, den, 3);
do_cancel_out(num, den, 5);
do_cancel_out(num, den, 7);
do_cancel_out(num, den, 11);
do_cancel_out(num, den, 13);
do_cancel_out(num, den, 17);
while ((*den) > den_limit) {
*num /= 2;
/*
* Round up the denominator so that the final fraction
* (num/den) is always <= the desired value
*/
*den = (*den + 1) / 2;
}
}