scanc.S revision 1.1 1 1.1 fvdl /* $NetBSD: scanc.S,v 1.1 2001/06/19 00:22:47 fvdl Exp $ */
2 1.1 fvdl
3 1.1 fvdl /*-
4 1.1 fvdl * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 1.1 fvdl * All rights reserved.
6 1.1 fvdl *
7 1.1 fvdl * This code is derived from software contributed to The NetBSD Foundation
8 1.1 fvdl * by Charles M. Hannum.
9 1.1 fvdl *
10 1.1 fvdl * Redistribution and use in source and binary forms, with or without
11 1.1 fvdl * modification, are permitted provided that the following conditions
12 1.1 fvdl * are met:
13 1.1 fvdl * 1. Redistributions of source code must retain the above copyright
14 1.1 fvdl * notice, this list of conditions and the following disclaimer.
15 1.1 fvdl * 2. Redistributions in binary form must reproduce the above copyright
16 1.1 fvdl * notice, this list of conditions and the following disclaimer in the
17 1.1 fvdl * documentation and/or other materials provided with the distribution.
18 1.1 fvdl * 3. All advertising materials mentioning features or use of this software
19 1.1 fvdl * must display the following acknowledgement:
20 1.1 fvdl * This product includes software developed by the NetBSD
21 1.1 fvdl * Foundation, Inc. and its contributors.
22 1.1 fvdl * 4. Neither the name of The NetBSD Foundation nor the names of its
23 1.1 fvdl * contributors may be used to endorse or promote products derived
24 1.1 fvdl * from this software without specific prior written permission.
25 1.1 fvdl *
26 1.1 fvdl * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 1.1 fvdl * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 1.1 fvdl * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 1.1 fvdl * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 1.1 fvdl * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 1.1 fvdl * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 1.1 fvdl * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 1.1 fvdl * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 1.1 fvdl * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 1.1 fvdl * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 1.1 fvdl * POSSIBILITY OF SUCH DAMAGE.
37 1.1 fvdl */
38 1.1 fvdl
39 1.1 fvdl /*
40 1.1 fvdl * Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl (at) wasabisystems.com>
41 1.1 fvdl */
42 1.1 fvdl
43 1.1 fvdl #include <machine/asm.h>
44 1.1 fvdl
45 1.1 fvdl ENTRY(scanc)
46 1.1 fvdl movq %rdx,%r11
47 1.1 fvdl movb %cl,%dl
48 1.1 fvdl movl %edi,%ecx
49 1.1 fvdl testl %ecx,%ecx
50 1.1 fvdl jz 2f
51 1.1 fvdl movq %r11,%rdi
52 1.1 fvdl xorq %rax,%rax
53 1.1 fvdl cld
54 1.1 fvdl 1:
55 1.1 fvdl lodsb
56 1.1 fvdl testb %dl,(%rax,%rdi)
57 1.1 fvdl jnz 2f
58 1.1 fvdl decl %ecx
59 1.1 fvdl jnz 1b
60 1.1 fvdl 2:
61 1.1 fvdl movl %ecx,%eax
62 1.1 fvdl ret
63