diff options
Diffstat (limited to 'lib/libc/alpha/string/ffs.S')
-rw-r--r-- | lib/libc/alpha/string/ffs.S | 92 |
1 files changed, 0 insertions, 92 deletions
diff --git a/lib/libc/alpha/string/ffs.S b/lib/libc/alpha/string/ffs.S deleted file mode 100644 index 11147d6..0000000 --- a/lib/libc/alpha/string/ffs.S +++ /dev/null @@ -1,92 +0,0 @@ -/* $NetBSD: ffs.S,v 1.3 1996/10/17 03:08:13 cgd Exp $ */ - -/* - * Copyright (c) 1995 Christopher G. Demetriou - * 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. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by Christopher G. Demetriou - * for the NetBSD Project. - * 4. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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("$FreeBSD$"); - -LEAF(ffs, 1) - addl a0, 0, t0 - beq t0, Lallzero - - /* - * Initialize return value (v0), and set up t1 so that it - * contains the mask with only the lowest bit set. - */ - subl zero, t0, t1 - ldil v0, 1 - and t0, t1, t1 - - and t1, 0xff, t2 - bne t2, Ldo8 - - /* - * If lower 16 bits empty, add 16 to result and use upper 16. - */ - zapnot t1, 0x03, t3 - bne t3, Ldo16 - sra t1, 16, t1 - addl v0, 16, v0 - -Ldo16: - /* - * If lower 8 bits empty, add 8 to result and use upper 8. - */ - and t1, 0xff, t4 - bne t4, Ldo8 - sra t1, 8, t1 - addl v0, 8, v0 - -Ldo8: - and t1, 0x0f, t5 /* lower 4 of 8 empty? */ - and t1, 0x33, t6 /* lower 2 of each 4 empty? */ - and t1, 0x55, t7 /* lower 1 of each 2 empty? */ - - /* If lower 4 bits empty, add 4 to result. */ - bne t5, Ldo4 - addl v0, 4, v0 - -Ldo4: /* If lower 2 bits of each 4 empty, add 2 to result. */ - bne t6, Ldo2 - addl v0, 2, v0 - -Ldo2: /* If lower bit of each 2 empty, add 1 to result. */ - bne t7, Ldone - addl v0, 1, v0 - -Ldone: - RET - -Lallzero: - bis zero, zero, v0 - RET -END(ffs) |