79 lines
2.3 KiB
ArmAsm
79 lines
2.3 KiB
ArmAsm
/*-
|
|
* Copyright (c) 2000 Doug Rabson
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
ENTRY(bzero, 2)
|
|
|
|
cmp.le p6,p0=in1,r0 // bail if len <= 0
|
|
(p6) br.ret.spnt.few rp
|
|
|
|
mov r14=ar.lc // save ar.lc
|
|
|
|
cmp.ltu p6,p0=17,in1 // check for small
|
|
(p6) br.dptk.few 3f
|
|
|
|
add r15=-1,in1 ;;
|
|
1: mov ar.lc=r15
|
|
2: st1 [in0]=r0,1 // zero one byte
|
|
br.cloop.sptk.few 2b // loop
|
|
|
|
mov ar.lc=r14 // done
|
|
br.ret.sptk.few rp
|
|
|
|
// Zero up to 8byte alignment
|
|
|
|
3: tbit.nz p6,p0=in1,0 ;;
|
|
(p6) st1 [in0]=r0,1
|
|
(p6) add in1=-1,in1
|
|
|
|
tbit.nz p6,p0=in1,1 ;;
|
|
(p6) st2 [in0]=r0,2
|
|
(p6) add in1=-2,in1
|
|
|
|
tbit.nz p6,p0=in1,2 ;;
|
|
(p6) st4 [in0]=r0,4
|
|
(p6) add in1=-4,in1
|
|
|
|
shr.u r15=in1,3 // word count
|
|
extr.u in1=in1,0,3 ;; // trailing bytes
|
|
cmp.eq p6,p0=r15,r0 // check for zero
|
|
cmp.ne p7,p0=in1,r0
|
|
(p6) br.dpnt.few 1b // zero last bytes
|
|
|
|
add r15=-1,r15 ;;
|
|
mov ar.lc=r15
|
|
4: st8 [in0]=r0,8
|
|
br.cloop.sptk.few 4b
|
|
|
|
(p7) br.dpnt.few 1b // zero last bytes
|
|
|
|
mov ar.lc=r14 // done
|
|
br.ret.sptk.few rp
|
|
|
|
END(bzero) |