summaryrefslogtreecommitdiff
path: root/sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S
blob: c035329ecede0593d216699483b87331bd6b06c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
/* Optimized memchr with sse2
   Copyright (C) 2011-2017 Free Software Foundation, Inc.
   Contributed by Intel Corporation.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#if IS_IN (libc)

# include <sysdep.h>

# define CFI_PUSH(REG)	\
	cfi_adjust_cfa_offset (4);	\
	cfi_rel_offset (REG, 0)

# define CFI_POP(REG)	\
	cfi_adjust_cfa_offset (-4);	\
	cfi_restore (REG)

# define PUSH(REG) pushl REG; CFI_PUSH (REG)
# define POP(REG) popl REG; CFI_POP (REG)

# define PARMS  4
# define STR1  PARMS
# define STR2  STR1+4

# ifndef USE_AS_RAWMEMCHR
#  define LEN   STR2+4
#  define RETURN  POP(%edi); ret; CFI_PUSH(%edi);
# endif

# ifndef MEMCHR
#  define MEMCHR __memchr_sse2_bsf
# endif

	.text
ENTRY (MEMCHR)

	mov	STR1(%esp), %ecx
	movd	STR2(%esp), %xmm1

# ifndef USE_AS_RAWMEMCHR
	mov	LEN(%esp), %edx
	test	%edx, %edx
	jz	L(return_null_1)
# endif
	mov	%ecx, %eax

	punpcklbw %xmm1, %xmm1
	punpcklbw %xmm1, %xmm1

	and	$63, %ecx
	pshufd	$0, %xmm1, %xmm1

	cmp	$48, %ecx
	ja	L(crosscache)

	movdqu	(%eax), %xmm0
	pcmpeqb	%xmm1, %xmm0
/* Check if there is a match.  */
	pmovmskb %xmm0, %ecx
	test	%ecx, %ecx
	je	L(unaligned_no_match_1)
/* Check which byte is a match.  */
	bsf	%ecx, %ecx

# ifndef USE_AS_RAWMEMCHR
	sub	%ecx, %edx
	jbe	L(return_null_1)
# endif
	add	%ecx, %eax
	ret

	.p2align 4
L(unaligned_no_match_1):
# ifndef USE_AS_RAWMEMCHR
	sub	$16, %edx
	jbe	L(return_null_1)
	PUSH	(%edi)
	lea	16(%eax), %edi
	and	$15, %eax
	and	$-16, %edi
	add	%eax, %edx
# else
	lea	16(%eax), %edx
	and	$-16, %edx
# endif
	jmp	L(loop_prolog)

	.p2align 4
L(return_null_1):
	xor	%eax, %eax
	ret

# ifndef USE_AS_RAWMEMCHR
	CFI_POP	(%edi)
# endif

	.p2align 4
L(crosscache):
/* Handle unaligned string.  */

# ifndef USE_AS_RAWMEMCHR
	PUSH	(%edi)
	mov	%eax, %edi
	and	$15, %ecx
	and	$-16, %edi
	movdqa	(%edi), %xmm0
# else
	mov	%eax, %edx
	and	$15, %ecx
	and	$-16, %edx
	movdqa	(%edx), %xmm0
# endif
	pcmpeqb	%xmm1, %xmm0
/* Check if there is a match.  */
	pmovmskb %xmm0, %eax
/* Remove the leading bytes.  */
	sar	%cl, %eax
	test	%eax, %eax
	je	L(unaligned_no_match)
/* Check which byte is a match.  */
	bsf	%eax, %eax

# ifndef USE_AS_RAWMEMCHR
	sub	%eax, %edx
	jbe	L(return_null)
	add	%edi, %eax
	add	%ecx, %eax
	RETURN
# else
	add	%edx, %eax
	add	%ecx, %eax
	ret
# endif

	.p2align 4
L(unaligned_no_match):
# ifndef USE_AS_RAWMEMCHR
	sub	$16, %edx
	add	%ecx, %edx
	jle	L(return_null)
	add	$16, %edi
# else
	add	$16, %edx
# endif

	.p2align 4
/* Loop start on aligned string.  */
L(loop_prolog):
# ifndef USE_AS_RAWMEMCHR
	sub	$64, %edx
	jbe	L(exit_loop)
	movdqa	(%edi), %xmm0
# else
	movdqa	(%edx), %xmm0
# endif
	pcmpeqb	%xmm1, %xmm0
	pmovmskb %xmm0, %eax
	test	%eax, %eax
	jnz	L(matches)

# ifndef USE_AS_RAWMEMCHR
	movdqa	16(%edi), %xmm2
# else
	movdqa	16(%edx), %xmm2
# endif
	pcmpeqb	%xmm1, %xmm2
	pmovmskb %xmm2, %eax
	test	%eax, %eax
	jnz	L(matches16)

# ifndef USE_AS_RAWMEMCHR
	movdqa	32(%edi), %xmm3
# else
	movdqa	32(%edx), %xmm3
# endif
	pcmpeqb	%xmm1, %xmm3
	pmovmskb %xmm3, %eax
	test	%eax, %eax
	jnz	L(matches32)

# ifndef USE_AS_RAWMEMCHR
	movdqa	48(%edi), %xmm4
# else
	movdqa	48(%edx), %xmm4
# endif
	pcmpeqb	%xmm1, %xmm4

# ifndef USE_AS_RAWMEMCHR
	add	$64, %edi
# else
	add	$64, %edx
# endif
	pmovmskb %xmm4, %eax
	test	%eax, %eax
	jnz	L(matches0)

# ifndef USE_AS_RAWMEMCHR
	test	$0x3f, %edi
# else
	test	$0x3f, %edx
# endif
	jz	L(align64_loop)

# ifndef USE_AS_RAWMEMCHR
	sub	$64, %edx
	jbe	L(exit_loop)
	movdqa	(%edi), %xmm0
# else
	movdqa	(%edx), %xmm0
# endif
	pcmpeqb	%xmm1, %xmm0
	pmovmskb %xmm0, %eax
	test	%eax, %eax
	jnz	L(matches)

# ifndef USE_AS_RAWMEMCHR
	movdqa	16(%edi), %xmm2
# else
	movdqa	16(%edx), %xmm2
# endif
	pcmpeqb	%xmm1, %xmm2
	pmovmskb %xmm2, %eax
	test	%eax, %eax
	jnz	L(matches16)

# ifndef USE_AS_RAWMEMCHR
	movdqa	32(%edi), %xmm3
# else
	movdqa	32(%edx), %xmm3
# endif
	pcmpeqb	%xmm1, %xmm3
	pmovmskb %xmm3, %eax
	test	%eax, %eax
	jnz	L(matches32)

# ifndef USE_AS_RAWMEMCHR
	movdqa	48(%edi), %xmm3
# else
	movdqa	48(%edx), %xmm3
# endif
	pcmpeqb	%xmm1, %xmm3
	pmovmskb %xmm3, %eax

# ifndef USE_AS_RAWMEMCHR
	add	$64, %edi
# else
	add	$64, %edx
# endif
	test	%eax, %eax
	jnz	L(matches0)

# ifndef USE_AS_RAWMEMCHR
	mov	%edi, %ecx
	and	$-64, %edi
	and	$63, %ecx
	add	%ecx, %edx
# else
	and	$-64, %edx
# endif

	.p2align 4
L(align64_loop):
# ifndef USE_AS_RAWMEMCHR
	sub	$64, %edx
	jbe	L(exit_loop)
	movdqa	(%edi), %xmm0
	movdqa	16(%edi), %xmm2
	movdqa	32(%edi), %xmm3
	movdqa	48(%edi), %xmm4
# else
	movdqa	(%edx), %xmm0
	movdqa	16(%edx), %xmm2
	movdqa	32(%edx), %xmm3
	movdqa	48(%edx), %xmm4
# endif
	pcmpeqb	%xmm1, %xmm0
	pcmpeqb	%xmm1, %xmm2
	pcmpeqb	%xmm1, %xmm3
	pcmpeqb	%xmm1, %xmm4

	pmaxub	%xmm0, %xmm3
	pmaxub	%xmm2, %xmm4
	pmaxub	%xmm3, %xmm4
	pmovmskb %xmm4, %eax

# ifndef USE_AS_RAWMEMCHR
	add	$64, %edi
# else
	add	$64, %edx
# endif

	test	%eax, %eax
	jz	L(align64_loop)

# ifndef USE_AS_RAWMEMCHR
	sub	$64, %edi
# else
	sub	$64, %edx
# endif

	pmovmskb %xmm0, %eax
	test	%eax, %eax
	jnz	L(matches)

	pmovmskb %xmm2, %eax
	test	%eax, %eax
	jnz	L(matches16)

# ifndef USE_AS_RAWMEMCHR
	movdqa	32(%edi), %xmm3
# else
	movdqa	32(%edx), %xmm3
# endif

	pcmpeqb	%xmm1, %xmm3

# ifndef USE_AS_RAWMEMCHR
	pcmpeqb	48(%edi), %xmm1
# else
	pcmpeqb	48(%edx), %xmm1
# endif
	pmovmskb %xmm3, %eax
	test	%eax, %eax
	jnz	L(matches32)

	pmovmskb %xmm1, %eax
	bsf	%eax, %eax

# ifndef USE_AS_RAWMEMCHR
	lea	48(%edi, %eax), %eax
	RETURN
# else
	lea	48(%edx, %eax), %eax
	ret
# endif

# ifndef USE_AS_RAWMEMCHR
	.p2align 4
L(exit_loop):
	add	$64, %edx
	cmp	$32, %edx
	jbe	L(exit_loop_32)

	movdqa	(%edi), %xmm0
	pcmpeqb	%xmm1, %xmm0
	pmovmskb %xmm0, %eax
	test	%eax, %eax
	jnz	L(matches)

	movdqa	16(%edi), %xmm2
	pcmpeqb	%xmm1, %xmm2
	pmovmskb %xmm2, %eax
	test	%eax, %eax
	jnz	L(matches16)

	movdqa	32(%edi), %xmm3
	pcmpeqb	%xmm1, %xmm3
	pmovmskb %xmm3, %eax
	test	%eax, %eax
	jnz	L(matches32_1)
	cmp	$48, %edx
	jbe	L(return_null)

	pcmpeqb	48(%edi), %xmm1
	pmovmskb %xmm1, %eax
	test	%eax, %eax
	jnz	L(matches48_1)
	xor	%eax, %eax
	RETURN

	.p2align 4
L(exit_loop_32):
	movdqa	(%edi), %xmm0
	pcmpeqb	%xmm1, %xmm0
	pmovmskb %xmm0, %eax
	test	%eax, %eax
	jnz	L(matches_1)
	cmp	$16, %edx
	jbe	L(return_null)

	pcmpeqb	16(%edi), %xmm1
	pmovmskb %xmm1, %eax
	test	%eax, %eax
	jnz	L(matches16_1)
	xor	%eax, %eax
	RETURN
# endif
	.p2align 4
L(matches0):
	bsf	%eax, %eax
# ifndef USE_AS_RAWMEMCHR
	lea	-16(%eax, %edi), %eax
	RETURN
# else
	lea	-16(%eax, %edx), %eax
	ret
# endif

	.p2align 4
L(matches):
	bsf	%eax, %eax
# ifndef USE_AS_RAWMEMCHR
	add	%edi, %eax
	RETURN
# else
	add	%edx, %eax
	ret
# endif

	.p2align 4
L(matches16):
	bsf	%eax, %eax
# ifndef USE_AS_RAWMEMCHR
	lea	16(%eax, %edi), %eax
	RETURN
# else
	lea	16(%eax, %edx), %eax
	ret
# endif

	.p2align 4
L(matches32):
	bsf	%eax, %eax
# ifndef USE_AS_RAWMEMCHR
	lea	32(%eax, %edi), %eax
	RETURN
# else
	lea	32(%eax, %edx), %eax
	ret
# endif

# ifndef USE_AS_RAWMEMCHR
	.p2align 4
L(matches_1):
	bsf	%eax, %eax
	sub	%eax, %edx
	jbe	L(return_null)

	add	%edi, %eax
	RETURN

	.p2align 4
L(matches16_1):
	sub	$16, %edx
	bsf	%eax, %eax
	sub	%eax, %edx
	jbe	L(return_null)

	lea	16(%edi, %eax), %eax
	RETURN

	.p2align 4
L(matches32_1):
	sub	$32, %edx
	bsf	%eax, %eax
	sub	%eax, %edx
	jbe	L(return_null)

	lea	32(%edi, %eax), %eax
	RETURN

	.p2align 4
L(matches48_1):
	sub	$48, %edx
	bsf	%eax, %eax
	sub	%eax, %edx
	jbe	L(return_null)

	lea	48(%edi, %eax), %eax
	RETURN
# endif
	.p2align 4
L(return_null):
	xor	%eax, %eax
# ifndef USE_AS_RAWMEMCHR
	RETURN
# else
	ret
# endif

END (MEMCHR)
#endif