167 lines
5.6 KiB
ArmAsm
167 lines
5.6 KiB
ArmAsm
/* $NetBSD: bcmp.S,v 1.7 1999/11/11 01:32:10 thorpej Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by J.T. Conklin.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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RCSID("from: @(#)bcmp.s 5.1 (Berkeley) 5/12/90")
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#else
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RCSID("$NetBSD: bcmp.S,v 1.7 1999/11/11 01:32:10 thorpej Exp $")
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#endif
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#endif /* LIBC_SCCS and not lint */
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ENTRY(bcmp)
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movl %sp@(4),%a0 | string 1
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movl %sp@(8),%a1 | string 2
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movl %sp@(12),%d1 | length
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/*
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* It isn't worth the overhead of aligning to {long}word boundries
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* if the string is too short.
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*/
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cmpl #8,%d1
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jlt Lbcbyte
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/* word align */
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movl %a0,%d0
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btst #0,%d0
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jeq Lbcalgndw
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cmpmb %a0@+,%a1@+
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jne Lbcnoteq
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subql #1,%d1
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Lbcalgndw:
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/* long word align */
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btst #1,%d0
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jeq Lbcalgndl
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cmpmw %a0@+,%a1@+
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jne Lbcnoteq
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subql #2,%d1
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Lbcalgndl:
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/* compare by 8 longwords */
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movl %d1,%d0
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lsrl #5,%d0 | cnt = len / 32
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jeq Lbclong | if (cnt)
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andl #31,%d1 | len %= 32
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subql #1,%d0 | set up for dbf
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Lbc32loop:
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cmpml %a0@+,%a1@+ | compare 8 longwords
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jne Lbcnoteq | not equal, return non-zero
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cmpml %a0@+,%a1@+
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jne Lbcnoteq
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cmpml %a0@+,%a1@+
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jne Lbcnoteq
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cmpml %a0@+,%a1@+
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jne Lbcnoteq
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cmpml %a0@+,%a1@+
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jne Lbcnoteq
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cmpml %a0@+,%a1@+
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jne Lbcnoteq
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cmpml %a0@+,%a1@+
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jne Lbcnoteq
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cmpml %a0@+,%a1@+
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jne Lbcnoteq
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dbf %d0,Lbc32loop | till done
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clrw %d0
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subql #1,%d0
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jcc Lbc32loop
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Lbclong:
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/* compare by longwords */
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movl %d1,%d0
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lsrl #2,%d0 | cnt = len / 4
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jeq Lbcbyte | if (cnt)
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subql #1,%d0 | set up for dbf
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Lbclloop:
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cmpml %a0@+,%a1@+ | compare a longword
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jne Lbcnoteq | not equal, return non-zero
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dbf %d0,Lbclloop | till done
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andl #3,%d1 | len %= 4
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jeq Lbcdone
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subql #1,%d1 | set up for dbf
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Lbcbloop:
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cmpmb %a0@+,%a1@+ | compare a byte
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jne Lbcnoteq | not equal, return non-zero
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Lbcbyte:
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dbf %d1,Lbcbloop
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Lbcdone:
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movql #0,%d0
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rts
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Lbcnoteq:
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movql #1,%d0
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rts
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