/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <TargetConditionals.h>
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/string/ffsll.c,v 1.1 2008/11/03 10:22:19 kib Exp $");

#include <strings.h>

/*
 * Find First Set bit
 */
int
ffsll(long long mask)
{
#if __has_builtin(__builtin_ffsll)
	return __builtin_ffsll(mask);
#elif __has_builtin(__builtin_ctzll)
	if (mask == 0)
		return (0);

	return __builtin_ctzll(mask) + 1;
#else
	int bit;

	if (mask == 0)
		return (0);
	for (bit = 1; !(mask & 1); bit++)
		mask = (unsigned long long)mask >> 1;
	return (bit);
#endif
}

#if VARIANT_DYLD && TARGET_IPHONE_SIMULATOR
int
ffsl(long mask)
{
#if __has_builtin(__builtin_ffsl)
	return __builtin_ffsl(mask);
#elif __has_builtin(__builtin_ctzl)
	if (mask == 0)
		return (0);

	return __builtin_ctzl(mask) + 1;
#else
	int bit;

	if (mask == 0)
		return (0);
	for (bit = 1; !(mask & 1); bit++)
		mask = (unsigned long)mask >> 1;
	return (bit);
#endif
}

int
ffs(int mask)
{
#if __has_builtin(__builtin_ffs)
	return __builtin_ffs(mask);
#elif __has_builtin(__builtin_ctz)
	if (mask == 0)
		return (0);

	return __builtin_ctz(mask) + 1;
#else
	int bit;

	if (mask == 0)
		return (0);
	for (bit = 1; !(mask & 1); bit++)
		mask = (unsigned)mask >> 1;
	return (bit);
#endif
}
#endif