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 withough 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#if defined(LIBC_RCS) && !defined(lint)
32 .text
| 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 withough 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#if defined(LIBC_RCS) && !defined(lint)
32 .text
|
33 .asciz "$FreeBSD: head/lib/libc/i386/string/strcmp.S 85437 2001-10-24 20:29:14Z peter $"
| 33 .asciz "$FreeBSD: head/lib/libc/i386/string/strcmp.S 91999 2002-03-10 12:08:28Z billf $"
|
34#endif /* LIBC_RCS and not lint */
35
36#include <machine/asm.h>
37
38/*
39 * strcmp(s1, s2)
40 * return an integer greater than, equal to, or less than 0,
41 * according as string s1 is greater than, equal to, or less
42 * than the string s2.
43 *
44 * %eax - pointer to s1
45 * %edx - pointer to s2
46 *
47 * Written by:
48 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
49 */
50
51/*
52 * I've unrolled the loop eight times: large enough to make a
53 * significant difference, and small enough not to totally trash the
| 34#endif /* LIBC_RCS and not lint */
35
36#include <machine/asm.h>
37
38/*
39 * strcmp(s1, s2)
40 * return an integer greater than, equal to, or less than 0,
41 * according as string s1 is greater than, equal to, or less
42 * than the string s2.
43 *
44 * %eax - pointer to s1
45 * %edx - pointer to s2
46 *
47 * Written by:
48 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
49 */
50
51/*
52 * I've unrolled the loop eight times: large enough to make a
53 * significant difference, and small enough not to totally trash the
|
54 * cashe.
| 54 * cache.
|
55 */
56
57ENTRY(strcmp)
58 movl 0x04(%esp),%eax
59 movl 0x08(%esp),%edx
60 jmp L2 /* Jump into the loop! */
61
62 .align 2,0x90
63L1: incl %eax
64 incl %edx
65L2: movb (%eax),%cl
66 testb %cl,%cl
67 je L3
68 cmpb %cl,(%edx)
69 jne L3
70 incl %eax
71 incl %edx
72 movb (%eax),%cl
73 testb %cl,%cl
74 je L3
75 cmpb %cl,(%edx)
76 jne L3
77 incl %eax
78 incl %edx
79 movb (%eax),%cl
80 testb %cl,%cl
81 je L3
82 cmpb %cl,(%edx)
83 jne L3
84 incl %eax
85 incl %edx
86 movb (%eax),%cl
87 testb %cl,%cl
88 je L3
89 cmpb %cl,(%edx)
90 jne L3
91 incl %eax
92 incl %edx
93 movb (%eax),%cl
94 testb %cl,%cl
95 je L3
96 cmpb %cl,(%edx)
97 jne L3
98 incl %eax
99 incl %edx
100 movb (%eax),%cl
101 testb %cl,%cl
102 je L3
103 cmpb %cl,(%edx)
104 jne L3
105 incl %eax
106 incl %edx
107 movb (%eax),%cl
108 testb %cl,%cl
109 je L3
110 cmpb %cl,(%edx)
111 jne L3
112 incl %eax
113 incl %edx
114 movb (%eax),%cl
115 testb %cl,%cl
116 je L3
117 cmpb %cl,(%edx)
118 je L1
119 .align 2, 0x90
120L3: movzbl (%eax),%eax /* unsigned comparison */
121 movzbl (%edx),%edx
122 subl %edx,%eax
123 ret
| 55 */
56
57ENTRY(strcmp)
58 movl 0x04(%esp),%eax
59 movl 0x08(%esp),%edx
60 jmp L2 /* Jump into the loop! */
61
62 .align 2,0x90
63L1: incl %eax
64 incl %edx
65L2: movb (%eax),%cl
66 testb %cl,%cl
67 je L3
68 cmpb %cl,(%edx)
69 jne L3
70 incl %eax
71 incl %edx
72 movb (%eax),%cl
73 testb %cl,%cl
74 je L3
75 cmpb %cl,(%edx)
76 jne L3
77 incl %eax
78 incl %edx
79 movb (%eax),%cl
80 testb %cl,%cl
81 je L3
82 cmpb %cl,(%edx)
83 jne L3
84 incl %eax
85 incl %edx
86 movb (%eax),%cl
87 testb %cl,%cl
88 je L3
89 cmpb %cl,(%edx)
90 jne L3
91 incl %eax
92 incl %edx
93 movb (%eax),%cl
94 testb %cl,%cl
95 je L3
96 cmpb %cl,(%edx)
97 jne L3
98 incl %eax
99 incl %edx
100 movb (%eax),%cl
101 testb %cl,%cl
102 je L3
103 cmpb %cl,(%edx)
104 jne L3
105 incl %eax
106 incl %edx
107 movb (%eax),%cl
108 testb %cl,%cl
109 je L3
110 cmpb %cl,(%edx)
111 jne L3
112 incl %eax
113 incl %edx
114 movb (%eax),%cl
115 testb %cl,%cl
116 je L3
117 cmpb %cl,(%edx)
118 je L1
119 .align 2, 0x90
120L3: movzbl (%eax),%eax /* unsigned comparison */
121 movzbl (%edx),%edx
122 subl %edx,%eax
123 ret
|