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093ecf92 LD |
1 | /* fast SSE2 memrchr with 64 byte loop and pmaxub instruction using |
2 | ||
04277e02 | 3 | Copyright (C) 2011-2019 Free Software Foundation, Inc. |
093ecf92 LD |
4 | Contributed by Intel Corporation. |
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 | |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
093ecf92 LD |
20 | |
21 | #include <sysdep.h> | |
22 | ||
23 | .text | |
380292ba | 24 | ENTRY (__memrchr) |
7395928b | 25 | movd %esi, %xmm1 |
093ecf92 | 26 | |
ecd8b842 | 27 | sub $16, %RDX_LP |
093ecf92 LD |
28 | jbe L(length_less16) |
29 | ||
30 | punpcklbw %xmm1, %xmm1 | |
31 | punpcklbw %xmm1, %xmm1 | |
32 | ||
ecd8b842 | 33 | add %RDX_LP, %RDI_LP |
093ecf92 LD |
34 | pshufd $0, %xmm1, %xmm1 |
35 | ||
36 | movdqu (%rdi), %xmm0 | |
37 | pcmpeqb %xmm1, %xmm0 | |
38 | ||
39 | /* Check if there is a match. */ | |
40 | pmovmskb %xmm0, %eax | |
41 | test %eax, %eax | |
42 | jnz L(matches0) | |
43 | ||
44 | sub $64, %rdi | |
7395928b L |
45 | mov %edi, %ecx |
46 | and $15, %ecx | |
093ecf92 LD |
47 | jz L(loop_prolog) |
48 | ||
49 | add $16, %rdi | |
50 | add $16, %rdx | |
51 | and $-16, %rdi | |
52 | sub %rcx, %rdx | |
53 | ||
54 | .p2align 4 | |
55 | L(loop_prolog): | |
56 | sub $64, %rdx | |
57 | jbe L(exit_loop) | |
58 | ||
59 | movdqa 48(%rdi), %xmm0 | |
60 | pcmpeqb %xmm1, %xmm0 | |
61 | pmovmskb %xmm0, %eax | |
62 | test %eax, %eax | |
63 | jnz L(matches48) | |
64 | ||
65 | movdqa 32(%rdi), %xmm2 | |
66 | pcmpeqb %xmm1, %xmm2 | |
67 | pmovmskb %xmm2, %eax | |
68 | test %eax, %eax | |
69 | jnz L(matches32) | |
70 | ||
71 | movdqa 16(%rdi), %xmm3 | |
72 | pcmpeqb %xmm1, %xmm3 | |
73 | pmovmskb %xmm3, %eax | |
74 | test %eax, %eax | |
75 | jnz L(matches16) | |
76 | ||
77 | movdqa (%rdi), %xmm4 | |
78 | pcmpeqb %xmm1, %xmm4 | |
79 | pmovmskb %xmm4, %eax | |
80 | test %eax, %eax | |
81 | jnz L(matches0) | |
82 | ||
83 | sub $64, %rdi | |
84 | sub $64, %rdx | |
85 | jbe L(exit_loop) | |
86 | ||
87 | movdqa 48(%rdi), %xmm0 | |
88 | pcmpeqb %xmm1, %xmm0 | |
89 | pmovmskb %xmm0, %eax | |
90 | test %eax, %eax | |
91 | jnz L(matches48) | |
92 | ||
93 | movdqa 32(%rdi), %xmm2 | |
94 | pcmpeqb %xmm1, %xmm2 | |
95 | pmovmskb %xmm2, %eax | |
96 | test %eax, %eax | |
97 | jnz L(matches32) | |
98 | ||
99 | movdqa 16(%rdi), %xmm3 | |
100 | pcmpeqb %xmm1, %xmm3 | |
101 | pmovmskb %xmm3, %eax | |
102 | test %eax, %eax | |
103 | jnz L(matches16) | |
104 | ||
105 | movdqa (%rdi), %xmm3 | |
106 | pcmpeqb %xmm1, %xmm3 | |
107 | pmovmskb %xmm3, %eax | |
108 | test %eax, %eax | |
109 | jnz L(matches0) | |
110 | ||
7395928b L |
111 | mov %edi, %ecx |
112 | and $63, %ecx | |
66fb11b1 | 113 | jz L(align64_loop) |
093ecf92 LD |
114 | |
115 | add $64, %rdi | |
116 | add $64, %rdx | |
117 | and $-64, %rdi | |
118 | sub %rcx, %rdx | |
119 | ||
120 | .p2align 4 | |
121 | L(align64_loop): | |
122 | sub $64, %rdi | |
123 | sub $64, %rdx | |
124 | jbe L(exit_loop) | |
125 | ||
126 | movdqa (%rdi), %xmm0 | |
127 | movdqa 16(%rdi), %xmm2 | |
128 | movdqa 32(%rdi), %xmm3 | |
129 | movdqa 48(%rdi), %xmm4 | |
130 | ||
131 | pcmpeqb %xmm1, %xmm0 | |
132 | pcmpeqb %xmm1, %xmm2 | |
133 | pcmpeqb %xmm1, %xmm3 | |
134 | pcmpeqb %xmm1, %xmm4 | |
135 | ||
136 | pmaxub %xmm3, %xmm0 | |
137 | pmaxub %xmm4, %xmm2 | |
138 | pmaxub %xmm0, %xmm2 | |
139 | pmovmskb %xmm2, %eax | |
140 | ||
141 | test %eax, %eax | |
142 | jz L(align64_loop) | |
143 | ||
144 | pmovmskb %xmm4, %eax | |
145 | test %eax, %eax | |
146 | jnz L(matches48) | |
147 | ||
148 | pmovmskb %xmm3, %eax | |
149 | test %eax, %eax | |
150 | jnz L(matches32) | |
151 | ||
152 | movdqa 16(%rdi), %xmm2 | |
153 | ||
154 | pcmpeqb %xmm1, %xmm2 | |
155 | pcmpeqb (%rdi), %xmm1 | |
156 | ||
157 | pmovmskb %xmm2, %eax | |
158 | test %eax, %eax | |
159 | jnz L(matches16) | |
160 | ||
161 | pmovmskb %xmm1, %eax | |
162 | bsr %eax, %eax | |
163 | ||
164 | add %rdi, %rax | |
165 | ret | |
166 | ||
167 | .p2align 4 | |
168 | L(exit_loop): | |
7395928b L |
169 | add $64, %edx |
170 | cmp $32, %edx | |
093ecf92 LD |
171 | jbe L(exit_loop_32) |
172 | ||
173 | movdqa 48(%rdi), %xmm0 | |
174 | pcmpeqb %xmm1, %xmm0 | |
175 | pmovmskb %xmm0, %eax | |
176 | test %eax, %eax | |
177 | jnz L(matches48) | |
178 | ||
179 | movdqa 32(%rdi), %xmm2 | |
180 | pcmpeqb %xmm1, %xmm2 | |
181 | pmovmskb %xmm2, %eax | |
182 | test %eax, %eax | |
183 | jnz L(matches32) | |
184 | ||
185 | movdqa 16(%rdi), %xmm3 | |
186 | pcmpeqb %xmm1, %xmm3 | |
187 | pmovmskb %xmm3, %eax | |
188 | test %eax, %eax | |
189 | jnz L(matches16_1) | |
7395928b | 190 | cmp $48, %edx |
093ecf92 LD |
191 | jbe L(return_null) |
192 | ||
193 | pcmpeqb (%rdi), %xmm1 | |
194 | pmovmskb %xmm1, %eax | |
195 | test %eax, %eax | |
196 | jnz L(matches0_1) | |
197 | xor %eax, %eax | |
198 | ret | |
199 | ||
200 | .p2align 4 | |
201 | L(exit_loop_32): | |
202 | movdqa 48(%rdi), %xmm0 | |
203 | pcmpeqb %xmm1, %xmm0 | |
204 | pmovmskb %xmm0, %eax | |
205 | test %eax, %eax | |
206 | jnz L(matches48_1) | |
7395928b | 207 | cmp $16, %edx |
093ecf92 LD |
208 | jbe L(return_null) |
209 | ||
210 | pcmpeqb 32(%rdi), %xmm1 | |
211 | pmovmskb %xmm1, %eax | |
212 | test %eax, %eax | |
213 | jnz L(matches32_1) | |
214 | xor %eax, %eax | |
215 | ret | |
216 | ||
217 | .p2align 4 | |
218 | L(matches0): | |
219 | bsr %eax, %eax | |
220 | add %rdi, %rax | |
221 | ret | |
222 | ||
223 | .p2align 4 | |
224 | L(matches16): | |
225 | bsr %eax, %eax | |
226 | lea 16(%rax, %rdi), %rax | |
227 | ret | |
228 | ||
229 | .p2align 4 | |
230 | L(matches32): | |
231 | bsr %eax, %eax | |
232 | lea 32(%rax, %rdi), %rax | |
233 | ret | |
234 | ||
235 | .p2align 4 | |
236 | L(matches48): | |
237 | bsr %eax, %eax | |
238 | lea 48(%rax, %rdi), %rax | |
239 | ret | |
240 | ||
241 | .p2align 4 | |
242 | L(matches0_1): | |
243 | bsr %eax, %eax | |
244 | sub $64, %rdx | |
245 | add %rax, %rdx | |
246 | jl L(return_null) | |
247 | add %rdi, %rax | |
248 | ret | |
249 | ||
250 | .p2align 4 | |
251 | L(matches16_1): | |
252 | bsr %eax, %eax | |
253 | sub $48, %rdx | |
254 | add %rax, %rdx | |
255 | jl L(return_null) | |
256 | lea 16(%rdi, %rax), %rax | |
257 | ret | |
258 | ||
259 | .p2align 4 | |
260 | L(matches32_1): | |
261 | bsr %eax, %eax | |
262 | sub $32, %rdx | |
263 | add %rax, %rdx | |
264 | jl L(return_null) | |
265 | lea 32(%rdi, %rax), %rax | |
266 | ret | |
267 | ||
268 | .p2align 4 | |
269 | L(matches48_1): | |
270 | bsr %eax, %eax | |
271 | sub $16, %rdx | |
272 | add %rax, %rdx | |
273 | jl L(return_null) | |
274 | lea 48(%rdi, %rax), %rax | |
275 | ret | |
276 | ||
277 | .p2align 4 | |
278 | L(return_null): | |
7395928b | 279 | xor %eax, %eax |
093ecf92 LD |
280 | ret |
281 | ||
282 | .p2align 4 | |
283 | L(length_less16_offset0): | |
81dcc7fb AS |
284 | test %edx, %edx |
285 | jz L(return_null) | |
286 | ||
093ecf92 LD |
287 | mov %dl, %cl |
288 | pcmpeqb (%rdi), %xmm1 | |
289 | ||
290 | mov $1, %edx | |
291 | sal %cl, %edx | |
292 | sub $1, %edx | |
293 | ||
294 | pmovmskb %xmm1, %eax | |
295 | ||
296 | and %edx, %eax | |
297 | test %eax, %eax | |
298 | jz L(return_null) | |
299 | ||
300 | bsr %eax, %eax | |
301 | add %rdi, %rax | |
302 | ret | |
303 | ||
304 | .p2align 4 | |
305 | L(length_less16): | |
306 | punpcklbw %xmm1, %xmm1 | |
307 | punpcklbw %xmm1, %xmm1 | |
308 | ||
7395928b | 309 | add $16, %edx |
093ecf92 LD |
310 | |
311 | pshufd $0, %xmm1, %xmm1 | |
312 | ||
7395928b L |
313 | mov %edi, %ecx |
314 | and $15, %ecx | |
093ecf92 LD |
315 | jz L(length_less16_offset0) |
316 | ||
093ecf92 | 317 | mov %cl, %dh |
7395928b | 318 | mov %ecx, %esi |
093ecf92 LD |
319 | add %dl, %dh |
320 | and $-16, %rdi | |
321 | ||
322 | sub $16, %dh | |
323 | ja L(length_less16_part2) | |
324 | ||
325 | pcmpeqb (%rdi), %xmm1 | |
326 | pmovmskb %xmm1, %eax | |
327 | ||
328 | sar %cl, %eax | |
329 | mov %dl, %cl | |
330 | ||
331 | mov $1, %edx | |
332 | sal %cl, %edx | |
333 | sub $1, %edx | |
334 | ||
335 | and %edx, %eax | |
336 | test %eax, %eax | |
337 | jz L(return_null) | |
338 | ||
339 | bsr %eax, %eax | |
340 | add %rdi, %rax | |
7395928b | 341 | add %rsi, %rax |
093ecf92 LD |
342 | ret |
343 | ||
344 | .p2align 4 | |
345 | L(length_less16_part2): | |
346 | movdqa 16(%rdi), %xmm2 | |
347 | pcmpeqb %xmm1, %xmm2 | |
348 | pmovmskb %xmm2, %eax | |
349 | ||
350 | mov %dh, %cl | |
351 | mov $1, %edx | |
352 | sal %cl, %edx | |
353 | sub $1, %edx | |
354 | ||
355 | and %edx, %eax | |
356 | ||
357 | test %eax, %eax | |
358 | jnz L(length_less16_part2_return) | |
359 | ||
360 | pcmpeqb (%rdi), %xmm1 | |
361 | pmovmskb %xmm1, %eax | |
362 | ||
7395928b | 363 | mov %esi, %ecx |
093ecf92 LD |
364 | sar %cl, %eax |
365 | test %eax, %eax | |
366 | jz L(return_null) | |
367 | ||
368 | bsr %eax, %eax | |
369 | add %rdi, %rax | |
7395928b | 370 | add %rsi, %rax |
093ecf92 LD |
371 | ret |
372 | ||
373 | .p2align 4 | |
374 | L(length_less16_part2_return): | |
375 | bsr %eax, %eax | |
376 | lea 16(%rax, %rdi), %rax | |
377 | ret | |
378 | ||
380292ba JM |
379 | END (__memrchr) |
380 | weak_alias (__memrchr, memrchr) |