diff options
Diffstat (limited to 'lib/libc/mips/string/ffs.S')
| -rw-r--r-- | lib/libc/mips/string/ffs.S | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/lib/libc/mips/string/ffs.S b/lib/libc/mips/string/ffs.S new file mode 100644 index 0000000..17e509c --- /dev/null +++ b/lib/libc/mips/string/ffs.S @@ -0,0 +1,59 @@ +/* $NetBSD: ffs.S,v 1.2 2009/12/14 00:39:00 matt Exp $ */ + +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Ralph Campbell. + * + * 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. + * 3. 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 <machine/asm.h> +__FBSDID("$FreeBSD$"); + +#if defined(LIBC_SCCS) && !defined(lint) + ASMSTR("from: @(#)ffs.s 8.1 (Berkeley) 6/4/93") + ASMSTR("$NetBSD: ffs.S,v 1.2 2009/12/14 00:39:00 matt Exp $") +#endif /* LIBC_SCCS and not lint */ + +#ifdef __ABICALLS__ + .abicalls +#endif + +/* bit = ffs(value) */ + +LEAF(ffs) + move v0, zero + beq a0, zero, done +1: + and v1, a0, 1 # bit set? + addu v0, v0, 1 + srl a0, a0, 1 + beq v1, zero, 1b # no, continue +done: + j ra +END(ffs) |
