1/*
2 * Copyright (c) 1993 Winning Strategies, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Winning Strategies, Inc.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <machine/asm.h>
| 1/*
2 * Copyright (c) 1993 Winning Strategies, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Winning Strategies, Inc.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <machine/asm.h>
|
33
34/*
35 * memcmp (void *b1, void *b2, size_t len)
36 *
37 * Written by:
38 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
39 */
40
41ENTRY(memcmp)
42 pushl %edi
43 pushl %esi
44 movl 12(%esp),%edi
45 movl 16(%esp),%esi
46 cld /* set compare direction forward */
47
48 movl 20(%esp),%ecx /* compare by words */
49 shrl $2,%ecx
50 repe
51 cmpsl
52 jne L5 /* do we match so far? */
53
54 movl 20(%esp),%ecx /* compare remainder by bytes */
55 andl $3,%ecx
56 repe
57 cmpsb
58 jne L6 /* do we match? */
59
60 xorl %eax,%eax /* we match, return zero */
61 popl %esi
62 popl %edi
63 ret
64
65L5: movl $4,%ecx /* We know that one of the next */
66 subl %ecx,%edi /* four pairs of bytes do not */
67 subl %ecx,%esi /* match. */
68 repe
69 cmpsb
70L6: movzbl -1(%edi),%eax /* Perform unsigned comparison */
71 movzbl -1(%esi),%edx
72 subl %edx,%eax
73 popl %esi
74 popl %edi
75 ret
| 33
34/*
35 * memcmp (void *b1, void *b2, size_t len)
36 *
37 * Written by:
38 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
39 */
40
41ENTRY(memcmp)
42 pushl %edi
43 pushl %esi
44 movl 12(%esp),%edi
45 movl 16(%esp),%esi
46 cld /* set compare direction forward */
47
48 movl 20(%esp),%ecx /* compare by words */
49 shrl $2,%ecx
50 repe
51 cmpsl
52 jne L5 /* do we match so far? */
53
54 movl 20(%esp),%ecx /* compare remainder by bytes */
55 andl $3,%ecx
56 repe
57 cmpsb
58 jne L6 /* do we match? */
59
60 xorl %eax,%eax /* we match, return zero */
61 popl %esi
62 popl %edi
63 ret
64
65L5: movl $4,%ecx /* We know that one of the next */
66 subl %ecx,%edi /* four pairs of bytes do not */
67 subl %ecx,%esi /* match. */
68 repe
69 cmpsb
70L6: movzbl -1(%edi),%eax /* Perform unsigned comparison */
71 movzbl -1(%esi),%edx
72 subl %edx,%eax
73 popl %esi
74 popl %edi
75 ret
|