2000-10-14 17:01:12 +00:00
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/*-
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* Copyright (c) 2000 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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2003-03-03 01:09:46 +00:00
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__FBSDID("$FreeBSD$");
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2000-10-14 17:01:12 +00:00
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ENTRY(bzero, 2)
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cmp.le p6,p0=in1,r0 // bail if len <= 0
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(p6) br.ret.spnt.few rp
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2001-10-22 08:48:11 +00:00
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;;
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2000-10-14 17:01:12 +00:00
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mov r14=ar.lc // save ar.lc
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2000-10-16 16:48:48 +00:00
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cmp.ltu p6,p0=17,in1 // check for small
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(p6) br.dptk.few 3f
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2000-10-14 17:01:12 +00:00
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2001-09-22 18:27:01 +00:00
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1: add r15=-1,in1 ;;
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mov ar.lc=r15 ;;
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2000-10-14 17:01:12 +00:00
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2: st1 [in0]=r0,1 // zero one byte
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br.cloop.sptk.few 2b // loop
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2001-09-22 18:27:01 +00:00
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;;
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2000-10-14 17:01:12 +00:00
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mov ar.lc=r14 // done
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br.ret.sptk.few rp
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// Zero up to 8byte alignment
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2000-10-16 16:48:48 +00:00
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2001-09-22 18:27:01 +00:00
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3: tbit.nz p6,p0=in0,0 ;;
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2000-10-14 17:01:12 +00:00
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(p6) st1 [in0]=r0,1
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2001-10-22 08:48:11 +00:00
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(p6) add in1=-1,in1 ;;
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2000-10-14 17:01:12 +00:00
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2001-09-22 18:27:01 +00:00
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tbit.nz p6,p0=in0,1 ;;
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2000-10-14 17:01:12 +00:00
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(p6) st2 [in0]=r0,2
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2001-10-22 08:48:11 +00:00
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(p6) add in1=-2,in1 ;;
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2000-10-14 17:01:12 +00:00
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2001-09-22 18:27:01 +00:00
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tbit.nz p6,p0=in0,2 ;;
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2000-10-14 17:01:12 +00:00
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(p6) st4 [in0]=r0,4
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(p6) add in1=-4,in1
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2001-09-22 18:27:01 +00:00
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;;
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2000-10-14 17:01:12 +00:00
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shr.u r15=in1,3 // word count
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extr.u in1=in1,0,3 ;; // trailing bytes
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cmp.eq p6,p0=r15,r0 // check for zero
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cmp.ne p7,p0=in1,r0
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(p6) br.dpnt.few 1b // zero last bytes
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2000-10-16 16:48:48 +00:00
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add r15=-1,r15 ;;
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2001-09-22 18:27:01 +00:00
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mov ar.lc=r15 ;;
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2000-10-16 16:48:48 +00:00
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4: st8 [in0]=r0,8
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br.cloop.sptk.few 4b
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2000-10-14 17:01:12 +00:00
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(p7) br.dpnt.few 1b // zero last bytes
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2001-09-22 18:27:01 +00:00
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;;
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2000-10-14 17:01:12 +00:00
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mov ar.lc=r14 // done
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br.ret.sptk.few rp
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2001-09-22 18:27:01 +00:00
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END(bzero)
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