about summary refs log tree commit diff
path: root/sysdeps/powerpc/powerpc64/power8/strcasestr.S
blob: fc98574bec3e8e2106318ab10be4a52e17a16056 (plain) (blame)
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
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
/* Optimized strcasestr implementation for PowerPC64/POWER8.
   Copyright (C) 2016-2024 Free Software Foundation, Inc.
   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
   <https://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include <locale-defines.h>

/* Char * [r3] strcasestr (char *s [r3], char * pat[r4])  */

/* The performance gain is obtained by comparing 16 bytes.  */

/* When the first char of r4 is hit ITERATIONS times in r3
   fallback to default.  */
#define ITERATIONS	64

#ifndef STRCASESTR
# define STRCASESTR __strcasestr
#endif

#ifndef STRLEN
/* For builds without IFUNC support, local calls should be made to internal
   GLIBC symbol (created by libc_hidden_builtin_def).  */
# ifdef SHARED
#  define STRLEN   __GI_strlen
# else
#  define STRLEN   strlen
# endif
#endif

#ifndef STRNLEN
/* For builds without IFUNC support, local calls should be made to internal
   GLIBC symbol (created by libc_hidden_builtin_def).  */
# ifdef SHARED
#  define STRNLEN   __GI_strnlen
# else
#  define STRNLEN    __strnlen
# endif
#endif

#ifndef STRCHR
# ifdef SHARED
#  define STRCHR   __GI_strchr
# else
#  define STRCHR   strchr
# endif
#endif

/* Convert 16 bytes of v4 and reg to lowercase and compare.  */
#define TOLOWER(reg)     \
	vcmpgtub	v6, v4, v1; \
	vcmpgtub	v7, v2, v4; \
	vand	v8, v7, v6; \
	vand	v8, v8, v3; \
	vor	v4, v8, v4; \
	vcmpgtub	v6, reg, v1; \
	vcmpgtub	v7, v2, reg; \
	vand	v8, v7, v6; \
	vand	v8, v8, v3; \
	vor	reg, v8, reg; \
	vcmpequb.	v6, reg, v4;

#define	FRAMESIZE	(FRAME_MIN_SIZE+48)
	.machine  power8
ENTRY (STRCASESTR, 4)
	CALL_MCOUNT 2
	mflr	r0			/* Load link register LR to r0.  */
	std	r31, -8(r1)		/* Save callers register r31.  */
	std	r30, -16(r1)		/* Save callers register r30.  */
	std	r29, -24(r1)		/* Save callers register r29.  */
	std	r28, -32(r1)		/* Save callers register r28.  */
	std	r27, -40(r1)		/* Save callers register r27.  */
	std	r0, 16(r1)		/* Store the link register.  */
	cfi_offset(r31, -8)
	cfi_offset(r30, -16)
	cfi_offset(r29, -24)
	cfi_offset(r28, -32)
	cfi_offset(r27, -40)
	cfi_offset(lr, 16)
	stdu	r1, -FRAMESIZE(r1)	/* Create the stack frame.  */
	cfi_adjust_cfa_offset(FRAMESIZE)

	dcbt	0, r3
	dcbt	0, r4
	cmpdi	cr7, r3, 0		/* Input validation.  */
	beq	cr7, L(retnull)
	cmpdi	cr7, r4, 0
	beq	cr7, L(retnull)

	mr	r29, r3
	mr	r30, r4
	/* Load first byte from r4 and check if its null.  */
	lbz	r6, 0(r4)
	cmpdi	cr7, r6, 0
	beq	cr7, L(ret_r3)

	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r9, r10, __libc_tsd_LOCALE@tls
	ld	r9, 0(r9)
	ld	r9, LOCALE_CTYPE_TOUPPER(r9)
	sldi	r10, r6, 2		/* Convert to upper case.  */
	lwzx	r28, r9, r10

	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r11, r10, __libc_tsd_LOCALE@tls
	ld	r11, 0(r11)
	ld	r11, LOCALE_CTYPE_TOLOWER(r11)
	sldi	r10, r6, 2              /* Convert to lower case.  */
	lwzx	r27, r11, r10

	/* Check if the first char is present.  */
	mr	r4, r27
	bl	STRCHR
	nop
	mr	r5, r3
	mr	r3, r29
	mr	r29, r5
	mr	r4, r28
	bl	STRCHR
	nop
	cmpdi	cr7, r29, 0
	beq	cr7, L(firstpos)
	cmpdi	cr7, r3, 0
	beq	cr7, L(skipcheck)
	cmpw	cr7, r3, r29
	ble 	cr7, L(firstpos)
	/* Move r3 to the first occurrence.  */
L(skipcheck):
	mr	r3, r29
L(firstpos):
	mr	r29, r3

	sldi	r9, r27, 8
	or	r28, r9, r28
	/* Reg r27 is used to count the number of iterations.  */
	li	r27, 0
	/* If first char of search str is not present.  */
	cmpdi	cr7, r3, 0
	ble	cr7, L(end)

	/* Find the length of pattern.  */
	mr	r3, r30
	bl	STRLEN
	nop

	cmpdi	cr7, r3, 0	/* If search str is null.  */
	beq	cr7, L(ret_r3)

	mr	r31, r3
	mr	r4, r3
	mr	r3, r29
	bl	STRNLEN
	nop

	cmpd	cr7, r3, r31 	/* If len(r3) < len(r4).  */
	blt	cr7, L(retnull)

	mr	r3, r29

	/* Locales not matching ASCII for single bytes.  */
	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r9, r10, __libc_tsd_LOCALE@tls
	ld	r9, 0(r9)
	ld	r7, 0(r9)
	addi	r7, r7, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES
	lwz	r8, 0(r7)
	cmpdi	cr7, r8, 1
	beq	cr7, L(bytebybyte)

	/* If len(r4) < 16 handle byte by byte.  */
	/* For shorter strings we will not use vector registers.  */
	cmpdi	cr7, r31, 16
	blt	cr7, L(bytebybyte)

	/* Comparison values used for TOLOWER.  */
	/* Load v1 = 64('A' - 1), v2 = 91('Z' + 1), v3 = 32 in each byte.  */
	vspltish	v0, 0
	vspltisb	v5, 2
	vspltisb	v4, 4
	vsl	v3, v5, v4
	vaddubm	v1, v3, v3
	vspltisb	v5, 15
	vaddubm	v2, v5, v5
	vaddubm	v2, v1, v2
	vspltisb	v4, -3
	vaddubm	v2, v2, v4

	/*
	1. Load 16 bytes from r3 and r4
	2. Check if there is null, If yes, proceed byte by byte path.
	3. Else,Convert both to lowercase and compare.
	4. If they are same proceed to 1.
	5. If they dont match, find if first char of r4 is present in the
	   loaded 16 byte of r3.
	6. If yes, move position, load next 16 bytes of r3 and proceed to 2.
	*/

	mr	r8, r3		/* Save r3 for future use.  */
	mr	r4, r30		/* Restore r4.  */
	clrldi	r10, r4, 60
	lvx	v5, 0, r4	/* Load 16 bytes from r4.  */
	cmpdi	cr7, r10, 0
	beq	cr7, L(begin2)
	/* If r4 is unaligned, load another 16 bytes.  */
#ifdef __LITTLE_ENDIAN__
	lvsr	v7, 0, r4
#else
	lvsl	v7, 0, r4
#endif
	addi	r5, r4, 16
	lvx	v9, 0, r5
#ifdef __LITTLE_ENDIAN__
	vperm	v5, v9, v5, v7
#else
	vperm	v5, v5, v9, v7
#endif
L(begin2):
	lvx	v4, 0, r3
	vcmpequb.	v7, v0, v4	/* Check for null.  */
	beq	cr6, L(nullchk6)
	b	L(trailcheck)

        .align  4
L(nullchk6):
	clrldi	r10, r3, 60
	cmpdi	cr7, r10, 0
	beq	cr7, L(next16)
#ifdef __LITTLE_ENDIAN__
	lvsr	v7, 0, r3
#else
	lvsl	v7, 0, r3
#endif
	addi	r5, r3, 16
	/* If r3 is unaligned, load another 16 bytes.  */
	lvx	v10, 0, r5
#ifdef __LITTLE_ENDIAN__
	vperm	v4, v10, v4, v7
#else
	vperm	v4, v4, v10, v7
#endif
L(next16):
	vcmpequb.	v6, v0, v5	/* Check for null.  */
	beq	cr6, L(nullchk)
	b	L(trailcheck)

	.align	4
L(nullchk):
	vcmpequb.	v6, v0, v4
	beq	cr6, L(nullchk1)
	b	L(retnull)

	.align	4
L(nullchk1):
	/* Convert both v3 and v4 to lower.  */
	TOLOWER(v5)
	/* If both are same, branch to match.  */
	blt	cr6, L(match)
	/* Find if the first char is present in next 15 bytes.  */
#ifdef __LITTLE_ENDIAN__
	vspltb	v6, v5, 15
	vsldoi	v7, v0, v4, 15
#else
	vspltb	v6, v5, 0
	vspltisb	v7, 8
	vslo	v7, v4, v7
#endif
	vcmpequb	v7, v6, v7
	vcmpequb.	v6, v0, v7
	/* Shift r3 by 16 bytes and proceed.  */
	blt	cr6, L(shift16)
	vclzd	v8, v7
#ifdef __LITTLE_ENDIAN__
	vspltb	v6, v8, 15
#else
	vspltb	v6, v8, 7
#endif
	vcmpequb.	v6, v6, v1
	/* Shift r3 by 8  bytes and proceed.  */
	blt	cr6, L(shift8)
	b	L(begin)

	.align	4
L(match):
	/* There is a match of 16 bytes, check next bytes.  */
	cmpdi	cr7, r31, 16
	mr	r29, r3
	beq	cr7, L(ret_r3)

L(secondmatch):
	addi	r3, r3, 16
	addi	r4, r4, 16
	/* Load next 16 bytes of r3 and r4 and compare.  */
	clrldi	r10, r4, 60
	cmpdi	cr7, r10, 0
	beq	cr7, L(nextload)
	/* Handle unaligned case.  */
	vor	v6, v9, v9
	vcmpequb.	v7, v0, v6
	beq	cr6, L(nullchk2)
	b	L(trailcheck)

	.align	4
L(nullchk2):
#ifdef __LITTLE_ENDIAN__
	lvsr	v7, 0, r4
#else
	lvsl	v7, 0, r4
#endif
	addi	r5, r4, 16
	/* If r4 is unaligned, load another 16 bytes.  */
	lvx	v9, 0, r5
#ifdef __LITTLE_ENDIAN__
	vperm	v11, v9, v6, v7
#else
	vperm	v11, v6, v9, v7
#endif
	b	L(compare)

	.align	4
L(nextload):
	lvx	v11, 0, r4
L(compare):
	vcmpequb.	v7, v0, v11
	beq	cr6, L(nullchk3)
	b	L(trailcheck)

	.align	4
L(nullchk3):
	clrldi	r10, r3, 60
	cmpdi 	cr7, r10, 0
	beq 	cr7, L(nextload1)
	/* Handle unaligned case.  */
	vor	v4, v10, v10
	vcmpequb.	v7, v0, v4
	beq	cr6, L(nullchk4)
	b	L(retnull)

	.align	4
L(nullchk4):
#ifdef __LITTLE_ENDIAN__
	lvsr	v7, 0, r3
#else
	lvsl	v7, 0, r3
#endif
	addi	r5, r3, 16
	/* If r3 is unaligned, load another 16 bytes.  */
	lvx	v10, 0, r5
#ifdef __LITTLE_ENDIAN__
	vperm	v4, v10, v4, v7
#else
	vperm	v4, v4, v10, v7
#endif
	b	L(compare1)

	.align	4
L(nextload1):
	lvx	v4, 0, r3
L(compare1):
	vcmpequb.	v7, v0, v4
	beq	cr6, L(nullchk5)
	b	L(retnull)

	.align	4
L(nullchk5):
	/* Convert both v3 and v4 to lower.  */
	TOLOWER(v11)
	/* If both are same, branch to secondmatch.  */
	blt 	cr6, L(secondmatch)
	/* Continue the search.  */
        b	L(begin)

	.align	4
L(trailcheck):
	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r11, r10, __libc_tsd_LOCALE@tls
	ld	r11, 0(r11)
	ld	r11, LOCALE_CTYPE_TOLOWER(r11)
L(loop2):
	lbz	r5, 0(r3)               /* Load byte from r3.  */
	lbz	r6, 0(r4)               /* Load next byte from r4.  */
	cmpdi 	cr7, r6, 0              /* Is it null?  */
	beq 	cr7, L(updater3)
	cmpdi 	cr7, r5, 0              /* Is it null?  */
	beq 	cr7, L(retnull)         /* If yes, return.  */
	addi	r3, r3, 1
	addi	r4, r4, 1               /* Increment r4.  */
	sldi	r10, r5, 2              /* Convert to lower case.  */
	lwzx	r10, r11, r10
	sldi	r7, r6, 2               /* Convert to lower case.  */
	lwzx	r7, r11, r7
	cmpw	cr7, r7, r10            /* Compare with byte from r4.  */
	bne	cr7, L(begin)
	b	L(loop2)

	.align	4
L(shift8):
	addi	r8, r8, 7
	b	L(begin)
	.align	4
L(shift16):
	addi	r8, r8, 15
	.align	4
L(begin):
	addi	r8, r8, 1
	mr	r3, r8
	/* When our iterations exceed ITERATIONS,fall back to default.  */
	addi	r27, r27, 1
	cmpdi	cr7, r27, ITERATIONS
	beq	cr7, L(default)
	mr	r4, r30         /* Restore r4.  */
	b	L(begin2)

	/* Handling byte by byte.  */
	.align	4
L(loop1):
	mr	r3, r8
	addi	r27, r27, 1
	cmpdi	cr7, r27, ITERATIONS
	beq	cr7, L(default)
	mr	r29, r8
	srdi	r4, r28, 8
	/* Check if the first char is present.  */
	bl	STRCHR
	nop
	mr	r5, r3
	mr	r3, r29
	mr	r29, r5
	sldi	r4, r28, 56
	srdi	r4, r4, 56
	bl	STRCHR
	nop
	cmpdi	cr7, r29, 0
	beq	cr7, L(nextpos)
	cmpdi	cr7, r3, 0
	beq	cr7, L(skipcheck1)
	cmpw	cr7, r3, r29
	ble 	cr7, L(nextpos)
	/* Move r3 to first occurrence.  */
L(skipcheck1):
	mr	r3, r29
L(nextpos):
	mr	r29, r3
	cmpdi 	cr7, r3, 0
	ble 	cr7, L(retnull)
L(bytebybyte):
	ld	r10, __libc_tsd_LOCALE@got@tprel(r2)
	add	r11, r10, __libc_tsd_LOCALE@tls
	ld	r11, 0(r11)
	ld	r11, LOCALE_CTYPE_TOLOWER(r11)
	mr	r4, r30                 /* Restore r4.  */
	mr	r8, r3                  /* Save r3.  */
	addi	r8, r8, 1

L(loop):
	addi	r3, r3, 1
	lbz	r5, 0(r3)               /* Load byte from r3.  */
	addi	r4, r4, 1               /* Increment r4.  */
	lbz	r6, 0(r4)               /* Load next byte from r4.  */
	cmpdi 	cr7, r6, 0              /* Is it null?  */
	beq 	cr7, L(updater3)
	cmpdi 	cr7, r5, 0              /* Is it null?  */
	beq 	cr7, L(retnull)         /* If yes, return.  */
	sldi	r10, r5, 2              /* Convert to lower case.  */
	lwzx	r10, r11, r10
	sldi	r7, r6, 2               /* Convert to lower case.  */
	lwzx	r7, r11, r7
	cmpw	cr7, r7, r10            /* Compare with byte from r4.  */
	bne 	cr7, L(loop1)
	b	L(loop)

	/* Handling return values.  */
	.align	4
L(updater3):
	subf	r3, r31, r3	/* Reduce r31 (len of r4) from r3.  */
	b	L(end)

	.align	4
L(ret_r3):
	mr	r3, r29		/* Return point of match.  */
	b	L(end)

	.align	4
L(retnull):
	li	r3, 0		/* Substring was not found.  */
	b	L(end)

	.align	4
L(default):
	mr	r4, r30
	bl	__strcasestr_ppc
	nop

	.align	4
L(end):
	addi	r1, r1, FRAMESIZE	/* Restore stack pointer.  */
	cfi_adjust_cfa_offset(-FRAMESIZE)
	ld	r0, 16(r1)	/* Restore the saved link register.  */
	ld	r27, -40(r1)
	ld	r28, -32(r1)
	ld	r29, -24(r1)	/* Restore callers save register r29.  */
	ld	r30, -16(r1)	/* Restore callers save register r30.  */
	ld	r31, -8(r1)	/* Restore callers save register r31.  */
	cfi_restore(lr)
	cfi_restore(r27)
	cfi_restore(r28)
	cfi_restore(r29)
	cfi_restore(r30)
	cfi_restore(r31)
	mtlr	r0		/* Branch to link register.  */
	blr
END (STRCASESTR)

weak_alias (__strcasestr, strcasestr)
libc_hidden_def (__strcasestr)
libc_hidden_builtin_def (strcasestr)