1/* $NetBSD: ffs.S,v 1.2 2009/12/14 00:39:00 matt Exp $ */
2
3/*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
9 *
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28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <machine/asm.h>
36__FBSDID("$FreeBSD: head/lib/libc/mips/string/ffs.S 209231 2010-06-16 12:55:14Z jchandra $");
37
38#if defined(LIBC_SCCS) && !defined(lint)
39 ASMSTR("from: @(#)ffs.s 8.1 (Berkeley) 6/4/93")
40 ASMSTR("$NetBSD: ffs.S,v 1.2 2009/12/14 00:39:00 matt Exp $")
41#endif /* LIBC_SCCS and not lint */
42
43#ifdef __ABICALLS__
44 .abicalls
45#endif
46
47/* bit = ffs(value) */
48
49LEAF(ffs)
50 move v0, zero
51 beq a0, zero, done
521:
53 and v1, a0, 1 # bit set?
54 addu v0, v0, 1
55 srl a0, a0, 1
56 beq v1, zero, 1b # no, continue
57done:
58 j ra
59END(ffs)
2
3/*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
9 *
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28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <machine/asm.h>
36__FBSDID("$FreeBSD: head/lib/libc/mips/string/ffs.S 209231 2010-06-16 12:55:14Z jchandra $");
37
38#if defined(LIBC_SCCS) && !defined(lint)
39 ASMSTR("from: @(#)ffs.s 8.1 (Berkeley) 6/4/93")
40 ASMSTR("$NetBSD: ffs.S,v 1.2 2009/12/14 00:39:00 matt Exp $")
41#endif /* LIBC_SCCS and not lint */
42
43#ifdef __ABICALLS__
44 .abicalls
45#endif
46
47/* bit = ffs(value) */
48
49LEAF(ffs)
50 move v0, zero
51 beq a0, zero, done
521:
53 and v1, a0, 1 # bit set?
54 addu v0, v0, 1
55 srl a0, a0, 1
56 beq v1, zero, 1b # no, continue
57done:
58 j ra
59END(ffs)