| ffs.S (178580) | ffs.S (209231) |
|---|---|
| 1/* $NetBSD: ffs.S,v 1.1 2005/12/20 19:28:49 christos Exp $ */ | 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 * --- 18 unchanged lines hidden (view full) --- 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> | 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 * --- 18 unchanged lines hidden (view full) --- 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 178580 2008-04-26 12:08:02Z imp $"); | 36__FBSDID("$FreeBSD: head/lib/libc/mips/string/ffs.S 209231 2010-06-16 12:55:14Z jchandra $"); |
| 37 38#if defined(LIBC_SCCS) && !defined(lint) 39 ASMSTR("from: @(#)ffs.s 8.1 (Berkeley) 6/4/93") | 37 38#if defined(LIBC_SCCS) && !defined(lint) 39 ASMSTR("from: @(#)ffs.s 8.1 (Berkeley) 6/4/93") |
| 40 ASMSTR("$NetBSD: ffs.S,v 1.1 2005/12/20 19:28:49 christos Exp $") | 40 ASMSTR("$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) | 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) |