1/* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less
2 than N.
3 For SPARC v9.
4 Copyright (C) 1998-2024 Free Software Foundation, Inc.
5 This file is part of the GNU C Library.
6
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
11
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
16
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <https://www.gnu.org/licenses/>. */
20
21#include <sysdep.h>
22#include <asm/asi.h>
23#ifndef XCC
24#define XCC xcc
25#define USE_BPR
26 .register %g2, #scratch
27 .register %g3, #scratch
28#endif
29
30 /* Normally, this uses
31 ((xword - 0x0101010101010101) & 0x8080808080808080) test
32 to find out if any byte in xword could be zero. This is fast, but
33 also gives false alarm for any byte in range 0x81-0xff. It does
34 not matter for correctness, as if this test tells us there could
35 be some zero byte, we check it byte by byte, but if bytes with
36 high bits set are common in the strings, then this will give poor
37 performance. You can #define EIGHTBIT_NOT_RARE and the algorithm
38 will use one tick slower, but more precise test
39 ((xword - 0x0101010101010101) & (~xword) & 0x8080808080808080),
40 which does not give any false alarms (but if some bits are set,
41 one cannot assume from it which bytes are zero and which are not).
42 It is yet to be measured, what is the correct default for glibc
43 in these days for an average user.
44 */
45
46 .text
47 .align 32
48ENTRY(__memchr)
49 and %o1, 0xff, %o1 /* IEU0 Group */
50#ifdef USE_BPR
51 brz,pn %o2, 12f /* CTI+IEU1 */
52#else
53 tst %o2 /* IEU1 */
54 be,pn %XCC, 12f /* CTI */
55#endif
56 sll %o1, 8, %g3 /* IEU0 Group */
57 addcc %o0, %o2, %o2 /* IEU1 */
58 movcs %XCC, -1, %o2 /* IEU0 Group */
59
60 sethi %hi(0x01010101), %g1 /* IEU0 Group */
61 or %g3, %o1, %g3 /* IEU1 */
62 ldub [%o0], %o3 /* Load */
63 sllx %g3, 16, %g5 /* IEU0 Group */
64
65 or %g1, %lo(0x01010101), %g1 /* IEU1 */
66 sllx %g1, 32, %g2 /* IEU0 Group */
67 or %g3, %g5, %g3 /* IEU1 */
68 sllx %g3, 32, %g5 /* IEU0 Group */
69
70 cmp %o3, %o1 /* IEU1 */
71 be,pn %xcc, 13f /* CTI */
72 or %g1, %g2, %g1 /* IEU0 Group */
73 andcc %o0, 7, %g0 /* IEU1 */
74
75 bne,a,pn %icc, 21f /* CTI */
76 add %o0, 1, %o0 /* IEU0 Group */
77 ldx [%o0], %o3 /* Load Group */
78 sllx %g1, 7, %g2 /* IEU0 */
79
80 or %g3, %g5, %g3 /* IEU1 */
811: add %o0, 8, %o0 /* IEU0 Group */
82 xor %o3, %g3, %o4 /* IEU1 */
83 /* %g1 = 0101010101010101 *
84 * %g2 = 8080088080808080 *
85 * %g3 = c c c c c c c c *
86 * %o3 = value *
87 * %o4 = value XOR c */
882: cmp %o0, %o2 /* IEU1 Group */
89
90 bgu,pn %XCC, 11f /* CTI */
91 ldxa [%o0] ASI_PNF, %o3 /* Load */
92 sub %o4, %g1, %o5 /* IEU0 Group */
93 add %o0, 8, %o0 /* IEU1 */
94#ifdef EIGHTBIT_NOT_RARE
95 andn %o5, %o4, %o5 /* IEU0 Group */
96#endif
97
98 andcc %o5, %g2, %g0 /* IEU1 Group */
99 be,a,pt %xcc, 2b /* CTI */
100 xor %o3, %g3, %o4 /* IEU0 */
101 srlx %o4, 56, %g5 /* IEU0 */
102
103 andcc %g5, 0xff, %g0 /* IEU1 Group */
104 be,pn %icc, 3f /* CTI */
105 srlx %o4, 48, %g5 /* IEU0 */
106 andcc %g5, 0xff, %g0 /* IEU1 Group */
107
108 be,pn %icc, 4f /* CTI */
109 srlx %o4, 40, %g5 /* IEU0 */
110 andcc %g5, 0xff, %g0 /* IEU1 Group */
111 be,pn %icc, 5f /* CTI */
112
113 srlx %o4, 32, %g5 /* IEU0 */
114 andcc %g5, 0xff, %g0 /* IEU1 Group */
115 be,pn %icc, 6f /* CTI */
116 srlx %o4, 24, %g5 /* IEU0 */
117
118 andcc %g5, 0xff, %g0 /* IEU1 Group */
119 be,pn %icc, 7f /* CTI */
120 srlx %o4, 16, %g5 /* IEU0 */
121 andcc %g5, 0xff, %g0 /* IEU1 Group */
122
123 be,pn %icc, 8f /* CTI */
124 srlx %o4, 8, %g5 /* IEU0 */
125 andcc %g5, 0xff, %g0 /* IEU1 Group */
126 be,pn %icc, 9f /* CTI */
127
128 andcc %o4, 0xff, %g0 /* IEU1 Group */
129 bne,pt %icc, 2b /* CTI */
130 xor %o3, %g3, %o4 /* IEU0 */
131 retl /* CTI+IEU1 Group */
132
133 add %o0, -9, %o0 /* IEU0 */
134
135 .align 16
1363: retl /* CTI+IEU1 Group */
137 add %o0, -16, %o0 /* IEU0 */
1384: retl /* CTI+IEU1 Group */
139 add %o0, -15, %o0 /* IEU0 */
140
1415: retl /* CTI+IEU1 Group */
142 add %o0, -14, %o0 /* IEU0 */
1436: retl /* CTI+IEU1 Group */
144 add %o0, -13, %o0 /* IEU0 */
145
1467: retl /* CTI+IEU1 Group */
147 add %o0, -12, %o0 /* IEU0 */
1488: retl /* CTI+IEU1 Group */
149 add %o0, -11, %o0 /* IEU0 */
150
1519: retl /* CTI+IEU1 Group */
152 add %o0, -10, %o0 /* IEU0 */
15311: sub %o4, %g1, %o5 /* IEU0 Group */
154 sub %o0, 8, %o0 /* IEU1 */
155
156 andcc %o5, %g2, %g0 /* IEU1 Group */
157 be,pt %xcc, 12f /* CTI */
158 sub %o2, %o0, %o2 /* IEU0 */
159 tst %o2 /* IEU1 Group */
160
161 be,pn %XCC, 12f /* CTI */
162 srlx %o4, 56, %g5 /* IEU0 */
163 andcc %g5, 0xff, %g0 /* IEU1 Group */
164 be,pn %icc, 13f /* CTI */
165
166 cmp %o2, 1 /* IEU0 */
167 be,pn %XCC, 12f /* CTI Group */
168 srlx %o4, 48, %g5 /* IEU0 */
169 andcc %g5, 0xff, %g0 /* IEU1 Group */
170
171 be,pn %icc, 14f /* CTI */
172 cmp %o2, 2 /* IEU1 Group */
173 be,pn %XCC, 12f /* CTI */
174 srlx %o4, 40, %g5 /* IEU0 */
175
176 andcc %g5, 0xff, %g0 /* IEU1 Group */
177 be,pn %icc, 15f /* CTI */
178 cmp %o2, 3 /* IEU1 Group */
179 be,pn %XCC, 12f /* CTI */
180
181 srlx %o4, 32, %g5 /* IEU0 */
182 andcc %g5, 0xff, %g0 /* IEU1 Group */
183 be,pn %icc, 16f /* CTI */
184 cmp %o2, 4 /* IEU1 Group */
185
186 be,pn %XCC, 12f /* CTI */
187 srlx %o4, 24, %g5 /* IEU0 */
188 andcc %g5, 0xff, %g0 /* IEU1 Group */
189 be,pn %icc, 17f /* CTI */
190
191 cmp %o2, 5 /* IEU1 Group */
192 be,pn %XCC, 12f /* CTI */
193 srlx %o4, 16, %g5 /* IEU0 */
194 andcc %g5, 0xff, %g0 /* IEU1 Group */
195
196 be,pn %icc, 18f /* CTI */
197 cmp %o2, 6 /* IEU1 Group */
198 be,pn %XCC, 12f /* CTI */
199 srlx %o4, 8, %g5 /* IEU0 */
200
201 andcc %g5, 0xff, %g0 /* IEU1 Group */
202 be,pn %icc, 19f /* CTI */
203 nop /* IEU0 */
20412: retl /* CTI+IEU1 Group */
205
206 clr %o0 /* IEU0 */
207 nop /* Stub */
20813: retl /* CTI+IEU1 Group */
209 nop /* IEU0 */
210
21114: retl /* CTI+IEU1 Group */
212 add %o0, 1, %o0 /* IEU0 */
21315: retl /* CTI+IEU1 Group */
214 add %o0, 2, %o0 /* IEU0 */
215
21616: retl /* CTI+IEU1 Group */
217 add %o0, 3, %o0 /* IEU0 */
21817: retl /* CTI+IEU1 Group */
219 add %o0, 4, %o0 /* IEU0 */
220
22118: retl /* CTI+IEU1 Group */
222 add %o0, 5, %o0 /* IEU0 */
22319: retl /* CTI+IEU1 Group */
224 add %o0, 6, %o0 /* IEU0 */
225
22621: cmp %o0, %o2 /* IEU1 */
227 be,pn %XCC, 12b /* CTI */
228 sllx %g1, 7, %g2 /* IEU0 Group */
229 ldub [%o0], %o3 /* Load */
230
231 or %g3, %g5, %g3 /* IEU1 */
23222: andcc %o0, 7, %g0 /* IEU1 Group */
233 be,a,pn %icc, 1b /* CTI */
234 ldx [%o0], %o3 /* Load */
235
236 cmp %o3, %o1 /* IEU1 Group */
237 be,pn %xcc, 23f /* CTI */
238 add %o0, 1, %o0 /* IEU0 */
239 cmp %o0, %o2 /* IEU1 Group */
240
241 bne,a,pt %XCC, 22b /* CTI */
242 ldub [%o0], %o3 /* Load */
243 retl /* CTI+IEU1 Group */
244 clr %o0 /* IEU0 */
245
24623: retl /* CTI+IEU1 Group */
247 add %o0, -1, %o0 /* IEU0 */
248END(__memchr)
249
250weak_alias (__memchr, memchr)
251libc_hidden_builtin_def (memchr)
252

source code of glibc/sysdeps/sparc/sparc64/memchr.S