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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $NetBSD: bcopy.S,v 1.2 2003/08/07 16:42:36 agc Exp $
32 * $FreeBSD: src/lib/libc/amd64/string/bcopy.S,v 1.3 2008/11/02 01:10:54 peter Exp $
35 #include <machine/asm.h>
38 * (ov)bcopy (src,dst,cnt)
39 * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
51 #if defined(MEMCOPY) || defined(MEMMOVE)
52 movq %rdi,%rax /* return dst */
59 cmpq %rcx,%r8 /* overlapping? */
61 cld /* nope, copy forwards. */
62 shrq $3,%rcx /* copy by words */
66 andq $7,%rcx /* any bytes left? */
71 addq %rcx,%rdi /* copy backwards. */
74 andq $7,%rcx /* any fractional bytes? */
79 movq %rdx,%rcx /* copy remainder by words */
97 .section .note.GNU-stack,"",%progbits