2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from locore.s.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 /* $FreeBSD: src/lib/libc/i386/string/bcopy.S,v 1.6.6.2 2002/11/07 19:35:25 sobomax Exp $ */
37 /* $DragonFly: src/lib/libcr/i386/string/Attic/bcopy.S,v 1.2 2003/06/17 04:26:43 dillon Exp $ */
39 #include <machine/asm.h>
41 RCSID("$NetBSD: bcopy.S,v 1.6 1996/11/12 00:50:06 jtc Exp $")
44 * (ov)bcopy (src,dst,cnt)
45 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
59 #if defined(MEMCOPY) || defined(MEMMOVE)
70 cmpl %ecx,%edx /* overlapping? */
72 cld /* nope, copy forwards. */
74 shrl $2,%ecx /* copy by words */
78 andl $3,%ecx /* any bytes left? */
85 addl %ecx,%edi /* copy backwards. */
89 andl $3,%ecx /* any fractional bytes? */
94 movl %edx,%ecx /* copy remainder by words */