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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. | |
62f29da7 | 4 | Copyright (C) 1996, 1999, 2000, 2003 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: | |
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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 AJ |
26 | You should have received a copy of the GNU Lesser General Public |
27 | License along with the GNU C Library; if not, write to the Free | |
28 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
29 | 02111-1307 USA. */ | |
ae6b8730 RH |
30 | |
31 | #include <sysdep.h> | |
32 | ||
33 | .text | |
34 | .align 4 | |
35 | 0: cmp %o2, 0 | |
36 | be 9f | |
37 | sethi %hi(0x80808080), %o4 | |
38 | ldub [%o0], %g4 | |
39 | cmp %g4, %o1 | |
40 | be 1f | |
41 | add %o0, 1, %o0 | |
42 | subcc %o2, 1, %o2 | |
43 | be 9f | |
44 | andcc %o0, 3, %g0 | |
45 | be 4f | |
46 | or %o4, %lo(0x80808080), %o3 | |
47 | ldub [%o0], %g4 | |
48 | cmp %g4, %o1 | |
49 | be 1f | |
50 | add %o0, 1, %o0 | |
51 | subcc %o2, 1, %o2 | |
52 | be 9f | |
53 | andcc %o0, 3, %g0 | |
54 | be 5f | |
55 | sethi %hi(0x01010101), %o5 | |
56 | ldub [%o0], %g4 | |
57 | cmp %g4, %o1 | |
58 | be 1f | |
59 | add %o0, 1, %o0 | |
60 | subcc %o2, 1, %o2 | |
61 | bne,a 7f | |
62 | and %o2, 3, %g1 | |
63 | retl | |
64 | clr %o0 | |
65 | 1: retl | |
66 | sub %o0, 1, %o0 | |
67 | ||
abf70633 | 68 | ENTRY(__memchr) |
ae6b8730 | 69 | andcc %o1, 0xff, %o1 |
62f29da7 | 70 | sll %o1, 8, %g6 |
ae6b8730 | 71 | andcc %o0, 3, %g0 |
62f29da7 UD |
72 | or %o1, %g6, %g6 |
73 | sll %g6, 16, %o3 | |
ae6b8730 | 74 | bne 0b |
62f29da7 | 75 | or %o3, %g6, %g2 |
ae6b8730 RH |
76 | sethi %hi(0x80808080), %o4 |
77 | or %o4, %lo(0x80808080), %o3 | |
78 | 4: sethi %hi(0x01010101), %o5 | |
79 | 5: and %o2, 3, %g1 | |
80 | 7: andcc %o2, 0xfffffffc, %o2 | |
81 | be 0f | |
62f29da7 | 82 | or %o5, %lo(0x01010101), %g6 |
ae6b8730 RH |
83 | ld [%o0], %g4 |
84 | 6: xor %g4, %g2, %g5 | |
85 | add %o0, 4, %o0 | |
62f29da7 | 86 | sub %g5, %g6, %g5 |
ae6b8730 RH |
87 | andcc %g5, %o3, %g0 |
88 | bne 8f | |
89 | subcc %o2, 4, %o2 | |
90 | bne,a 6b | |
91 | ld [%o0], %g4 | |
92 | 0: cmp %g1, 0 | |
93 | 1: be 9f | |
94 | add %o0, 4, %o0 | |
95 | ldub [%o0 - 4], %g4 | |
96 | cmp %g4, %o1 | |
97 | be 4f | |
98 | cmp %g1, 1 | |
99 | be 9f | |
100 | ldub [%o0 - 3], %g4 | |
101 | cmp %g4, %o1 | |
102 | be 3f | |
103 | cmp %g1, 2 | |
104 | be 9f | |
105 | ldub [%o0 - 2], %g4 | |
106 | cmp %g4, %o1 | |
107 | be 2f | |
108 | nop | |
109 | 9: retl | |
110 | clr %o0 | |
111 | ||
112 | /* Check every byte. */ | |
2ed5fd9a | 113 | 8: srl %g4, 24, %g5 |
ae6b8730 RH |
114 | and %g5, 0xff, %g5 |
115 | cmp %g5, %o1 | |
116 | be 4f | |
117 | srl %g4, 16, %g5 | |
118 | and %g5, 0xff, %g5 | |
119 | cmp %g5, %o1 | |
120 | be 3f | |
121 | srl %g4, 8, %g5 | |
122 | and %g5, 0xff, %g5 | |
123 | cmp %g5, %o1 | |
124 | be 2f | |
125 | and %g4, 0xff, %g5 | |
126 | cmp %g5, %o1 | |
127 | be 1f | |
128 | cmp %o2, 0 | |
129 | bne,a 6b | |
130 | ld [%o0], %g4 | |
131 | b 1b | |
132 | cmp %g1, 0 | |
133 | 1: retl | |
134 | sub %o0, 1, %o0 | |
135 | 2: retl | |
136 | sub %o0, 2, %o0 | |
137 | 3: retl | |
138 | sub %o0, 3, %o0 | |
139 | 4: retl | |
140 | sub %o0, 4, %o0 | |
abf70633 GM |
141 | END(__memchr) |
142 | ||
143 | weak_alias (__memchr, memchr) | |
2ed5fd9a GM |
144 | #if !__BOUNDED_POINTERS__ |
145 | weak_alias (__memchr, __ubp_memchr) | |
146 | #endif |