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ae6b8730 RH |
1 | /* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less |
2 | than N. | |
3 | For SPARC v7. | |
04277e02 | 4 | Copyright (C) 1996-2019 Free Software Foundation, Inc. |
ae6b8730 RH |
5 | This file is part of the GNU C Library. |
6 | Contributed by Jakub Jelinek <jj@ultra.linux.cz> and | |
7 | David S. Miller <davem@caip.rutgers.edu>. | |
ae6b8730 RH |
8 | This version is developed using the same algorithm as the fast C |
9 | version which carries the following introduction: | |
ae6b8730 RH |
10 | Based on strlen implementation by Torbjorn Granlund (tege@sics.se), |
11 | with help from Dan Sahlin (dan@sics.se) and | |
12 | commentary by Jim Blandy (jimb@ai.mit.edu); | |
13 | adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu), | |
14 | and implemented by Roland McGrath (roland@ai.mit.edu). | |
15 | ||
16 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
17 | modify it under the terms of the GNU Lesser General Public |
18 | License as published by the Free Software Foundation; either | |
19 | version 2.1 of the License, or (at your option) any later version. | |
ae6b8730 RH |
20 | |
21 | The GNU C Library is distributed in the hope that it will be useful, | |
22 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 24 | Lesser General Public License for more details. |
ae6b8730 | 25 | |
41bdb6e2 | 26 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 27 | License along with the GNU C Library; if not, see |
5a82c748 | 28 | <https://www.gnu.org/licenses/>. */ |
ae6b8730 RH |
29 | |
30 | #include <sysdep.h> | |
31 | ||
32 | .text | |
33 | .align 4 | |
043cee37 RM |
34 | ENTRY(__memchr) |
35 | andcc %o1, 0xff, %o1 | |
36 | sll %o1, 8, %g6 | |
37 | andcc %o0, 3, %g0 | |
38 | or %o1, %g6, %g6 | |
39 | sll %g6, 16, %o3 | |
40 | be 10f | |
41 | or %o3, %g6, %g2 | |
42 | cmp %o2, 0 | |
ae6b8730 RH |
43 | be 9f |
44 | sethi %hi(0x80808080), %o4 | |
45 | ldub [%o0], %g4 | |
46 | cmp %g4, %o1 | |
47 | be 1f | |
48 | add %o0, 1, %o0 | |
49 | subcc %o2, 1, %o2 | |
50 | be 9f | |
51 | andcc %o0, 3, %g0 | |
52 | be 4f | |
53 | or %o4, %lo(0x80808080), %o3 | |
54 | ldub [%o0], %g4 | |
55 | cmp %g4, %o1 | |
56 | be 1f | |
57 | add %o0, 1, %o0 | |
58 | subcc %o2, 1, %o2 | |
59 | be 9f | |
60 | andcc %o0, 3, %g0 | |
61 | be 5f | |
62 | sethi %hi(0x01010101), %o5 | |
63 | ldub [%o0], %g4 | |
64 | cmp %g4, %o1 | |
65 | be 1f | |
66 | add %o0, 1, %o0 | |
67 | subcc %o2, 1, %o2 | |
68 | bne,a 7f | |
69 | and %o2, 3, %g1 | |
70 | retl | |
71 | clr %o0 | |
72 | 1: retl | |
73 | sub %o0, 1, %o0 | |
043cee37 | 74 | 10: sethi %hi(0x80808080), %o4 |
ae6b8730 RH |
75 | or %o4, %lo(0x80808080), %o3 |
76 | 4: sethi %hi(0x01010101), %o5 | |
77 | 5: and %o2, 3, %g1 | |
78 | 7: andcc %o2, 0xfffffffc, %o2 | |
79 | be 0f | |
62f29da7 | 80 | or %o5, %lo(0x01010101), %g6 |
ae6b8730 RH |
81 | ld [%o0], %g4 |
82 | 6: xor %g4, %g2, %g5 | |
83 | add %o0, 4, %o0 | |
62f29da7 | 84 | sub %g5, %g6, %g5 |
ae6b8730 RH |
85 | andcc %g5, %o3, %g0 |
86 | bne 8f | |
87 | subcc %o2, 4, %o2 | |
88 | bne,a 6b | |
89 | ld [%o0], %g4 | |
90 | 0: cmp %g1, 0 | |
91 | 1: be 9f | |
92 | add %o0, 4, %o0 | |
93 | ldub [%o0 - 4], %g4 | |
94 | cmp %g4, %o1 | |
95 | be 4f | |
96 | cmp %g1, 1 | |
97 | be 9f | |
98 | ldub [%o0 - 3], %g4 | |
99 | cmp %g4, %o1 | |
100 | be 3f | |
101 | cmp %g1, 2 | |
102 | be 9f | |
103 | ldub [%o0 - 2], %g4 | |
104 | cmp %g4, %o1 | |
105 | be 2f | |
106 | nop | |
107 | 9: retl | |
108 | clr %o0 | |
109 | ||
110 | /* Check every byte. */ | |
2ed5fd9a | 111 | 8: srl %g4, 24, %g5 |
ae6b8730 RH |
112 | and %g5, 0xff, %g5 |
113 | cmp %g5, %o1 | |
114 | be 4f | |
115 | srl %g4, 16, %g5 | |
116 | and %g5, 0xff, %g5 | |
117 | cmp %g5, %o1 | |
118 | be 3f | |
119 | srl %g4, 8, %g5 | |
120 | and %g5, 0xff, %g5 | |
121 | cmp %g5, %o1 | |
122 | be 2f | |
123 | and %g4, 0xff, %g5 | |
124 | cmp %g5, %o1 | |
125 | be 1f | |
126 | cmp %o2, 0 | |
127 | bne,a 6b | |
128 | ld [%o0], %g4 | |
129 | b 1b | |
130 | cmp %g1, 0 | |
131 | 1: retl | |
132 | sub %o0, 1, %o0 | |
133 | 2: retl | |
134 | sub %o0, 2, %o0 | |
135 | 3: retl | |
136 | sub %o0, 3, %o0 | |
137 | 4: retl | |
138 | sub %o0, 4, %o0 | |
abf70633 GM |
139 | END(__memchr) |
140 | ||
141 | weak_alias (__memchr, memchr) | |
85dd1003 | 142 | libc_hidden_builtin_def (memchr) |