2 * Copyright (c) 2000 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <machine/asm.h>
28 __FBSDID("$FreeBSD$");
32 cmp.le p6,p0=in1,r0 // bail if len <= 0
33 (p6) br.ret.spnt.few rp
35 mov r14=ar.lc // save ar.lc
37 cmp.ltu p6,p0=17,in1 // check for small
42 2: st1 [in0]=r0,1 // zero one byte
43 br.cloop.sptk.few 2b // loop
49 // Zero up to 8byte alignment
51 3: tbit.nz p6,p0=in0,0 ;;
53 (p6) add in1=-1,in1 ;;
55 tbit.nz p6,p0=in0,1 ;;
57 (p6) add in1=-2,in1 ;;
59 tbit.nz p6,p0=in0,2 ;;
64 shr.u r15=in1,3 // word count
65 extr.u in1=in1,0,3 ;; // trailing bytes
66 cmp.eq p6,p0=r15,r0 // check for zero
68 (p6) br.dpnt.few 1b // zero last bytes
75 (p7) br.dpnt.few 1b // zero last bytes