src/arch/arm/libgcc/udivmoddi4.c

/*
 * This file is part of the coreboot 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; version 2 of the License.
 *
 * 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.
 */

#include "libgcc.h"

uint64_t __udivmoddi4(uint64_t num, uint64_t den, uint64_t *rem_p)
{
	uint64_t quot = 0, qbit = 1;
	if (den == 0) {
		return 1 / ((unsigned)den); /* Intentional divide by zero, without
					       triggering a compiler warning which
					       would abort the build */
	}

	/* Left-justify denominator and count shift */
	while ((int64_t)den >= 0) {
		den <<= 1;
		qbit <<= 1;
	}

	while (qbit) {
		if (den <= num) {
			num -= den;
			quot += qbit;
		}
		den >>= 1;
		qbit >>= 1;
	}

	if (rem_p)
		*rem_p = num;

	return quot;
}