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1 | /* rawmemchr (str, ch) -- Return pointer to first occurrence of CH in STR. |
2 | For SPARC v9. | |
b168057a | 3 | Copyright (C) 1999-2015 Free Software Foundation, Inc. |
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4 | This file is part of the GNU C Library. |
5 | Contributed by Jakub Jelinek <jj@ultra.linux.cz>. | |
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6 | This version is developed using the same algorithm as the fast C |
7 | version which carries the following introduction: | |
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8 | Based on strlen implementation by Torbjorn Granlund (tege@sics.se), |
9 | with help from Dan Sahlin (dan@sics.se) and | |
10 | commentary by Jim Blandy (jimb@ai.mit.edu); | |
11 | adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu), | |
12 | and implemented by Roland McGrath (roland@ai.mit.edu). | |
13 | ||
14 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
15 | modify it under the terms of the GNU Lesser General Public |
16 | License as published by the Free Software Foundation; either | |
17 | version 2.1 of the License, or (at your option) any later version. | |
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18 | |
19 | The GNU C Library is distributed in the hope that it will be useful, | |
20 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 22 | Lesser General Public License for more details. |
407d26b7 | 23 | |
41bdb6e2 | 24 | You should have received a copy of the GNU Lesser General Public |
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25 | License along with the GNU C Library; if not, see |
26 | <http://www.gnu.org/licenses/>. */ | |
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27 | |
28 | #include <sysdep.h> | |
29 | #include <asm/asi.h> | |
30 | #ifndef XCC | |
31 | #define XCC xcc | |
32 | #define USE_BPR | |
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33 | .register %g2, #scratch |
34 | .register %g3, #scratch | |
407d26b7 UD |
35 | #endif |
36 | ||
37 | /* Normally, this uses | |
38 | ((xword - 0x0101010101010101) & 0x8080808080808080) test | |
39 | to find out if any byte in xword could be zero. This is fast, but | |
40 | also gives false alarm for any byte in range 0x81-0xff. It does | |
41 | not matter for correctness, as if this test tells us there could | |
42 | be some zero byte, we check it byte by byte, but if bytes with | |
43 | high bits set are common in the strings, then this will give poor | |
44 | performance. You can #define EIGHTBIT_NOT_RARE and the algorithm | |
45 | will use one tick slower, but more precise test | |
46 | ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080), | |
47 | which does not give any false alarms (but if some bits are set, | |
48 | one cannot assume from it which bytes are zero and which are not). | |
49 | It is yet to be measured, what is the correct default for glibc | |
50 | in these days for an average user. | |
51 | */ | |
52 | ||
53 | .text | |
54 | .align 32 | |
55 | ENTRY(__rawmemchr) | |
56 | and %o1, 0xff, %o1 /* IEU0 Group */ | |
57 | sethi %hi(0x01010101), %g1 /* IEU1 */ | |
58 | ldub [%o0], %o3 /* Load */ | |
59 | sll %o1, 8, %o4 /* IEU0 Group */ | |
9c84384c | 60 | |
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61 | or %g1, %lo(0x01010101), %g1 /* IEU1 */ |
62 | sllx %g1, 32, %g2 /* IEU0 Group */ | |
63 | or %o4, %o1, %o4 /* IEU1 */ | |
64 | andcc %o0, 7, %g0 /* IEU1 Group */ | |
65 | ||
66 | sll %o4, 16, %g5 /* IEU0 */ | |
67 | or %o4, %g5, %o4 /* IEU0 Group */ | |
68 | or %g1, %g2, %g1 /* IEU1 */ | |
69 | bne,pn %icc, 32f /* CTI */ | |
70 | ||
71 | sllx %o4, 32, %g5 /* IEU0 Group */ | |
72 | cmp %o3, %o1 /* IEU1 */ | |
73 | be,pn %icc, 30f /* CTI */ | |
74 | sllx %g1, 7, %g2 /* IEU0 Group */ | |
75 | ||
76 | 18: ldx [%o0], %o3 /* Load */ | |
77 | or %o4, %g5, %o4 /* IEU1 */ | |
78 | add %o0, 8, %o0 /* IEU0 Group */ | |
79 | 19: xor %o3, %o4, %o3 /* IEU0 Group */ | |
80 | ||
81 | sub %o3, %g1, %o2 /* IEU0 Group */ | |
82 | #ifdef EIGHTBIT_NOT_RARE | |
8cb079d4 | 83 | andn %o2, %o3, %o5 /* IEU0 Group */ |
407d26b7 | 84 | ldxa [%o0] ASI_PNF, %o3 /* Load */ |
8cb079d4 | 85 | andcc %o5, %g2, %g0 /* IEU1 Group */ |
407d26b7 UD |
86 | #else |
87 | ldxa [%o0] ASI_PNF, %o3 /* Load */ | |
88 | andcc %o2, %g2, %g0 /* IEU1 Group */ | |
89 | #endif | |
90 | be,pt %xcc, 19b /* CTI */ | |
91 | ||
92 | add %o0, 8, %o0 /* IEU0 */ | |
93 | addcc %o2, %g1, %g3 /* IEU1 Group */ | |
94 | srlx %o2, 32, %o2 /* IEU0 */ | |
95 | 20: andcc %o2, %g2, %g0 /* IEU1 Group */ | |
96 | ||
97 | be,pn %xcc, 21f /* CTI */ | |
98 | srlx %g3, 56, %o2 /* IEU0 */ | |
99 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
100 | be,pn %icc, 29f /* CTI */ | |
101 | ||
102 | srlx %g3, 48, %o2 /* IEU0 */ | |
103 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
104 | be,pn %icc, 28f /* CTI */ | |
105 | srlx %g3, 40, %o2 /* IEU0 */ | |
106 | ||
107 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
108 | be,pn %icc, 27f /* CTI */ | |
109 | srlx %g3, 32, %o2 /* IEU0 */ | |
110 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
111 | ||
112 | be,pn %icc, 26f /* CTI */ | |
113 | 21: srlx %g3, 24, %o2 /* IEU0 */ | |
114 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
115 | be,pn %icc, 25f /* CTI */ | |
116 | ||
117 | srlx %g3, 16, %o2 /* IEU0 */ | |
118 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
119 | be,pn %icc, 24f /* CTI */ | |
120 | srlx %g3, 8, %o2 /* IEU0 */ | |
121 | ||
122 | andcc %o2, 0xff, %g0 /* IEU1 Group */ | |
123 | be,pn %icc, 23f /* CTI */ | |
124 | xor %o3, %o4, %o3 /* IEU0 */ | |
125 | andcc %g3, 0xff, %g0 /* IEU1 Group */ | |
126 | ||
127 | be,pn %icc, 22f /* CTI */ | |
128 | sub %o3, %g1, %o2 /* IEU0 */ | |
129 | ldxa [%o0] ASI_PNF, %o3 /* Load */ | |
130 | andcc %o2, %g2, %g0 /* IEU1 Group */ | |
131 | ||
132 | be,pt %xcc, 19b /* CTI */ | |
133 | add %o0, 8, %o0 /* IEU0 */ | |
134 | addcc %o2, %g1, %g3 /* IEU1 Group */ | |
135 | ba,pt %xcc, 20b /* CTI */ | |
136 | ||
137 | srlx %o2, 32, %o2 /* IEU0 */ | |
138 | ||
139 | .align 16 | |
140 | 22: retl /* CTI+IEU1 Group */ | |
141 | add %o0, -9, %o0 /* IEU0 */ | |
142 | 23: retl /* CTI+IEU1 Group */ | |
143 | add %o0, -10, %o0 /* IEU0 */ | |
144 | ||
145 | 24: retl /* CTI+IEU1 Group */ | |
146 | add %o0, -11, %o0 /* IEU0 */ | |
147 | 25: retl /* CTI+IEU1 Group */ | |
148 | add %o0, -12, %o0 /* IEU0 */ | |
149 | ||
150 | 26: retl /* CTI+IEU1 Group */ | |
151 | add %o0, -13, %o0 /* IEU0 */ | |
152 | 27: retl /* CTI+IEU1 Group */ | |
153 | add %o0, -14, %o0 /* IEU0 */ | |
154 | ||
155 | 28: retl /* CTI+IEU1 Group */ | |
156 | add %o0, -15, %o0 /* IEU0 */ | |
157 | 29: retl /* CTI+IEU1 Group */ | |
158 | add %o0, -16, %o0 /* IEU0 */ | |
159 | ||
160 | 30: retl /* CTI+IEU1 Group */ | |
161 | nop /* IEU0 */ | |
162 | ||
163 | .align 16 | |
164 | 32: andcc %o0, 7, %g0 /* IEU1 Group */ | |
165 | be,a,pn %icc, 18b /* CTI */ | |
166 | sllx %g1, 7, %g2 /* IEU0 */ | |
167 | add %o0, 1, %o0 /* IEU0 Group */ | |
168 | ||
169 | cmp %o3, %o1 /* IEU1 */ | |
170 | bne,a,pt %icc, 32b /* CTI */ | |
171 | lduba [%o0] ASI_PNF, %o3 /* Load */ | |
172 | retl /* CTI+IEU1 Group */ | |
173 | ||
174 | add %o0, -1, %o0 /* IEU0 */ | |
175 | END(__rawmemchr) | |
176 | ||
37ba7d66 | 177 | libc_hidden_def (__rawmemchr) |
407d26b7 | 178 | weak_alias (__rawmemchr, rawmemchr) |