summaryrefslogtreecommitdiff
path: root/recipes/glibc/glibc-cvs/arm-memcpy.patch
blob: bc2b3dab84863f0372207b2a7bb5afacc0348e9e (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
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
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
--- /dev/null	2004-02-02 20:32:13.000000000 +0000
+++ sysdeps/arm/memmove.S	2004-03-20 18:37:23.000000000 +0000
@@ -0,0 +1,251 @@
+/*
+ *   Optimized memmove implementation for ARM processors
+ *
+ *	Author: 	Nicolas Pitre
+ *	Created:	Dec 23, 2003
+ *	Copyright:	(C) MontaVista Software, Inc.
+ *
+ *   This file 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.
+ *
+ *   This file 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.
+ */
+
+#include <sysdep.h>
+
+
+/*
+ * Endian independent macros for shifting bytes within registers.
+ */
+#ifndef __ARMEB__
+#define pull            lsr
+#define push            lsl
+#else
+#define pull            lsl
+#define push            lsr
+#endif
+
+/*
+ * Enable data preload for architectures that support it (ARMv5 and above)
+ */
+#if defined(__ARM_ARCH_5__) || \
+    defined(__ARM_ARCH_5T__) || \
+    defined(__ARM_ARCH_5TE__)
+#define PLD(code...)	code
+#else
+#define PLD(code...)
+#endif
+
+
+/* char * memmove (char *dst, const char *src) */
+ENTRY(memmove)
+		subs	ip, r0, r1
+		cmphi	r2, ip
+		bls	memcpy(PLT)
+
+		stmfd	sp!, {r0, r4, lr}
+		add	r1, r1, r2
+		add	r0, r0, r2
+		subs	r2, r2, #4
+		blt	25f
+		ands	ip, r0, #3
+	PLD(	pld	[r1, #-4]		)
+		bne	26f
+		ands	ip, r1, #3
+		bne	27f
+
+19:		subs	r2, r2, #4
+		blt	24f
+		subs	r2, r2, #8
+		blt	23f
+		subs	r2, r2, #16
+		blt	22f
+
+	PLD(	pld	[r1, #-32]		)
+	PLD(	subs	r2, r2, #96		)
+		stmfd	sp!, {r5 - r8}
+	PLD(	blt	21f			)
+
+	PLD(	@ cache alignment		)
+	PLD(	ands	ip, r1, #31		)
+	PLD(	pld	[r1, #-64]		)
+	PLD(	beq	20f			)
+	PLD(	cmp	r2, ip			)
+	PLD(	pld	[r1, #-96]		)
+	PLD(	blt	20f			)
+	PLD(	cmp	ip, #16			)
+	PLD(	sub	r2, r2, ip		)
+	PLD(	ldmgedb	r1!, {r3 - r6}		)
+	PLD(	stmgedb	r0!, {r3 - r6}		)
+	PLD(	beq	20f			)
+	PLD(	and	ip, ip, #15		)
+	PLD(	cmp	ip, #8			)
+	PLD(	ldr	r3, [r1, #-4]!		)
+	PLD(	ldrge	r4, [r1, #-4]!		)
+	PLD(	ldrgt	r5, [r1, #-4]!		)
+	PLD(	str	r3, [r0, #-4]!		)
+	PLD(	strge	r4, [r0, #-4]!		)
+	PLD(	strgt	r5, [r0, #-4]!		)
+
+20:	PLD(	pld	[r1, #-96]		)
+	PLD(	pld	[r1, #-128]		)
+21:		ldmdb	r1!, {r3, r4, ip, lr}
+		subs	r2, r2, #32
+		stmdb	r0!, {r3, r4, ip, lr}
+		ldmdb	r1!, {r3, r4, ip, lr}
+		stmgedb	r0!, {r3, r4, ip, lr}
+		ldmgedb	r1!, {r3, r4, ip, lr}
+		stmgedb	r0!, {r3, r4, ip, lr}
+		ldmgedb	r1!, {r3, r4, ip, lr}
+		subges	r2, r2, #32
+		stmdb	r0!, {r3, r4, ip, lr}
+		bge	20b
+	PLD(	cmn	r2, #96			)
+	PLD(	bge	21b			)
+	PLD(	add	r2, r2, #96		)
+		tst	r2, #31
+		ldmfd	sp!, {r5 - r8}
+		ldmeqfd	sp!, {r0, r4, pc}
+
+		tst	r2, #16
+22:		ldmnedb	r1!, {r3, r4, ip, lr}
+		stmnedb	r0!, {r3, r4, ip, lr}
+
+		tst	r2, #8
+23:		ldmnedb	r1!, {r3, r4}
+		stmnedb	r0!, {r3, r4}
+
+		tst	r2, #4
+24:		ldrne	r3, [r1, #-4]!
+		strne	r3, [r0, #-4]!
+
+25:		ands	r2, r2, #3
+		ldmeqfd	sp!, {r0, r4, pc}
+
+		cmp	r2, #2
+		ldrb	r3, [r1, #-1]
+		ldrgeb	r4, [r1, #-2]
+		ldrgtb	ip, [r1, #-3]
+		strb	r3, [r0, #-1]
+		strgeb	r4, [r0, #-2]
+		strgtb	ip, [r0, #-3]
+		ldmfd	sp!, {r0, r4, pc}
+
+26:		cmp	ip, #2
+		ldrb	r3, [r1, #-1]!
+		ldrgeb	r4, [r1, #-1]!
+		ldrgtb	lr, [r1, #-1]!
+		strb	r3, [r0, #-1]!
+		strgeb	r4, [r0, #-1]!
+		strgtb	lr, [r0, #-1]!
+		subs	r2, r2, ip
+		blt	25b
+		ands	ip, r1, #3
+		beq	19b
+
+27:		bic	r1, r1, #3
+		cmp	ip, #2
+		ldr	r3, [r1]
+		beq	35f
+		blt	36f
+
+
+		.macro	backward_copy_shift push pull
+
+		cmp	r2, #12
+	PLD(	pld	[r1, #-4]		)
+		blt	33f
+		subs	r2, r2, #28
+		stmfd	sp!, {r5 - r9}
+		blt	31f
+
+	PLD(	subs	r2, r2, #96		)
+	PLD(	pld	[r1, #-32]		)
+	PLD(	blt	30f			)
+	PLD(	pld	[r1, #-64]		)
+
+	PLD(	@ cache alignment		)
+	PLD(	ands	ip, r1, #31		)
+	PLD(	pld	[r1, #-96]		)
+	PLD(	beq	29f			)
+	PLD(	cmp	r2, ip			)
+	PLD(	pld	[r1, #-128]		)
+	PLD(	blt	29f			)
+	PLD(	sub	r2, r2, ip		)
+28:	PLD(	mov	r4, r3, push #\push	)
+	PLD(	ldr	r3, [r1, #-4]!		)
+	PLD(	subs	ip, ip, #4		)
+	PLD(	orr	r4, r4, r3, pull #\pull	)
+	PLD(	str	r4, [r0, #-4]!		)
+	PLD(	bgt	28b			)
+
+29:	PLD(	pld	[r1, #-128]		)
+30:		mov	lr, r3, push #\push
+		ldmdb	r1!, {r3 - r9, ip}
+		subs	r2, r2, #32
+		orr	lr, lr, ip, pull #\pull
+		mov	ip, ip, push #\push
+		orr	ip, ip, r9, pull #\pull
+		mov	r9, r9, push #\push
+		orr	r9, r9, r8, pull #\pull
+		mov	r8, r8, push #\push
+		orr	r8, r8, r7, pull #\pull
+		mov	r7, r7, push #\push
+		orr	r7, r7, r6, pull #\pull
+		mov	r6, r6, push #\push
+		orr	r6, r6, r5, pull #\pull
+		mov	r5, r5, push #\push
+		orr	r5, r5, r4, pull #\pull
+		mov	r4, r4, push #\push
+		orr	r4, r4, r3, pull #\pull
+		stmdb	r0!, {r4 - r9, ip, lr}
+		bge	29b
+	PLD(	cmn	r2, #96			)
+	PLD(	bge	30b			)
+	PLD(	add	r2, r2, #96		)
+		cmn	r2, #16
+		blt	32f
+31:		mov	r7, r3, push #\push
+		ldmdb	r1!, {r3 - r6}
+		sub	r2, r2, #16
+		orr	r7, r7, r6, pull #\pull
+		mov	r6, r6, push #\push
+		orr	r6, r6, r5, pull #\pull
+		mov	r5, r5, push #\push
+		orr	r5, r5, r4, pull #\pull
+		mov	r4, r4, push #\push
+		orr	r4, r4, r3, pull #\pull
+		stmdb	r0!, {r4 - r7}
+32:		adds	r2, r2, #28
+		ldmfd	sp!, {r5 - r9}
+		blt	34f
+33:		mov	r4, r3, push #\push
+		ldr	r3, [r1, #-4]!
+		subs	r2, r2, #4
+		orr	r4, r4, r3, pull #\pull
+		str	r4, [r0, #-4]!
+		bge	33b
+34:
+		.endm
+
+
+		backward_copy_shift	push=8	pull=24
+		add	r1, r1, #3
+		b	25b
+
+35:		backward_copy_shift	push=16	pull=16
+		add	r1, r1, #2
+		b	25b
+
+36:		backward_copy_shift	push=24	pull=8
+		add	r1, r1, #1
+		b	25b
+
+		.size	memmove, . - memmove
+END(memmove)
+libc_hidden_builtin_def (memmove)
--- /dev/null	2004-02-02 20:32:13.000000000 +0000
+++ sysdeps/arm/bcopy.S	2004-03-20 18:37:48.000000000 +0000
@@ -0,0 +1,255 @@
+/*
+ *   Optimized memmove implementation for ARM processors
+ *
+ *	Author: 	Nicolas Pitre
+ *	Created:	Dec 23, 2003
+ *	Copyright:	(C) MontaVista Software, Inc.
+ *
+ *   This file 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.
+ *
+ *   This file 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.
+ */
+
+#include <sysdep.h>
+
+
+/*
+ * Endian independent macros for shifting bytes within registers.
+ */
+#ifndef __ARMEB__
+#define pull            lsr
+#define push            lsl
+#else
+#define pull            lsl
+#define push            lsr
+#endif
+
+/*
+ * Enable data preload for architectures that support it (ARMv5 and above)
+ */
+#if defined(__ARM_ARCH_5__) || \
+    defined(__ARM_ARCH_5T__) || \
+    defined(__ARM_ARCH_5TE__)
+#define PLD(code...)	code
+#else
+#define PLD(code...)
+#endif
+
+dst		.req	r1
+src		.req	r0
+
+/* void *bcopy (const char *src, char *dst, size_t size) */
+ENTRY(bcopy)
+		subs	ip, dst, src
+		cmphi	r2, ip
+		movls	r3, r0
+		movls	r0, r1
+		movls	r1, r3
+		bls	memcpy(PLT)
+
+		stmfd	sp!, {r4, lr}
+		add	src, src, r2
+		add	dst, dst, r2
+		subs	r2, r2, #4
+		blt	25f
+		ands	ip, dst, #3
+	PLD(	pld	[src, #-4]		)
+		bne	26f
+		ands	ip, src, #3
+		bne	27f
+
+19:		subs	r2, r2, #4
+		blt	24f
+		subs	r2, r2, #8
+		blt	23f
+		subs	r2, r2, #16
+		blt	22f
+
+	PLD(	pld	[src, #-32]		)
+	PLD(	subs	r2, r2, #96		)
+		stmfd	sp!, {r5 - r8}
+	PLD(	blt	21f			)
+
+	PLD(	@ cache alignment		)
+	PLD(	ands	ip, src, #31		)
+	PLD(	pld	[src, #-64]		)
+	PLD(	beq	20f			)
+	PLD(	cmp	r2, ip			)
+	PLD(	pld	[src, #-96]		)
+	PLD(	blt	20f			)
+	PLD(	cmp	ip, #16			)
+	PLD(	sub	r2, r2, ip		)
+	PLD(	ldmgedb	src!, {r3 - r6}		)
+	PLD(	stmgedb	dst!, {r3 - r6}		)
+	PLD(	beq	20f			)
+	PLD(	and	ip, ip, #15		)
+	PLD(	cmp	ip, #8			)
+	PLD(	ldr	r3, [src, #-4]!		)
+	PLD(	ldrge	r4, [src, #-4]!		)
+	PLD(	ldrgt	r5, [src, #-4]!		)
+	PLD(	str	r3, [dst, #-4]!		)
+	PLD(	strge	r4, [dst, #-4]!		)
+	PLD(	strgt	r5, [dst, #-4]!		)
+
+20:	PLD(	pld	[src, #-96]		)
+	PLD(	pld	[src, #-128]		)
+21:		ldmdb	src!, {r3, r4, ip, lr}
+		subs	r2, r2, #32
+		stmdb	dst!, {r3, r4, ip, lr}
+		ldmdb	src!, {r3, r4, ip, lr}
+		stmgedb	dst!, {r3, r4, ip, lr}
+		ldmgedb	src!, {r3, r4, ip, lr}
+		stmgedb	dst!, {r3, r4, ip, lr}
+		ldmgedb	src!, {r3, r4, ip, lr}
+		subges	r2, r2, #32
+		stmdb	dst!, {r3, r4, ip, lr}
+		bge	20b
+	PLD(	cmn	r2, #96			)
+	PLD(	bge	21b			)
+	PLD(	add	r2, r2, #96		)
+		tst	r2, #31
+		ldmfd	sp!, {r5 - r8}
+		ldmeqfd	sp!, {r4, pc}
+
+		tst	r2, #16
+22:		ldmnedb	src!, {r3, r4, ip, lr}
+		stmnedb	dst!, {r3, r4, ip, lr}
+
+		tst	r2, #8
+23:		ldmnedb	src!, {r3, r4}
+		stmnedb	dst!, {r3, r4}
+
+		tst	r2, #4
+24:		ldrne	r3, [src, #-4]!
+		strne	r3, [dst, #-4]!
+
+25:		ands	r2, r2, #3
+		ldmeqfd	sp!, {dst, r4, pc}
+
+		cmp	r2, #2
+		ldrb	r3, [src, #-1]
+		ldrgeb	r4, [src, #-2]
+		ldrgtb	ip, [src, #-3]
+		strb	r3, [dst, #-1]
+		strgeb	r4, [dst, #-2]
+		strgtb	ip, [dst, #-3]
+		ldmfd	sp!, {dst, r4, pc}
+
+26:		cmp	ip, #2
+		ldrb	r3, [src, #-1]!
+		ldrgeb	r4, [src, #-1]!
+		ldrgtb	lr, [src, #-1]!
+		strb	r3, [dst, #-1]!
+		strgeb	r4, [dst, #-1]!
+		strgtb	lr, [dst, #-1]!
+		subs	r2, r2, ip
+		blt	25b
+		ands	ip, src, #3
+		beq	19b
+
+27:		bic	src, src, #3
+		cmp	ip, #2
+		ldr	r3, [src]
+		beq	35f
+		blt	36f
+
+
+		.macro	backward_copy_shift push pull
+
+		cmp	r2, #12
+	PLD(	pld	[src, #-4]		)
+		blt	33f
+		subs	r2, r2, #28
+		stmfd	sp!, {r5 - r9}
+		blt	31f
+
+	PLD(	subs	r2, r2, #96		)
+	PLD(	pld	[src, #-32]		)
+	PLD(	blt	30f			)
+	PLD(	pld	[src, #-64]		)
+
+	PLD(	@ cache alignment		)
+	PLD(	ands	ip, src, #31		)
+	PLD(	pld	[src, #-96]		)
+	PLD(	beq	29f			)
+	PLD(	cmp	r2, ip			)
+	PLD(	pld	[src, #-128]		)
+	PLD(	blt	29f			)
+	PLD(	sub	r2, r2, ip		)
+28:	PLD(	mov	r4, r3, push #\push	)
+	PLD(	ldr	r3, [src, #-4]!		)
+	PLD(	subs	ip, ip, #4		)
+	PLD(	orr	r4, r4, r3, pull #\pull	)
+	PLD(	str	r4, [dst, #-4]!		)
+	PLD(	bgt	28b			)
+
+29:	PLD(	pld	[src, #-128]		)
+30:		mov	lr, r3, push #\push
+		ldmdb	src!, {r3 - r9, ip}
+		subs	r2, r2, #32
+		orr	lr, lr, ip, pull #\pull
+		mov	ip, ip, push #\push
+		orr	ip, ip, r9, pull #\pull
+		mov	r9, r9, push #\push
+		orr	r9, r9, r8, pull #\pull
+		mov	r8, r8, push #\push
+		orr	r8, r8, r7, pull #\pull
+		mov	r7, r7, push #\push
+		orr	r7, r7, r6, pull #\pull
+		mov	r6, r6, push #\push
+		orr	r6, r6, r5, pull #\pull
+		mov	r5, r5, push #\push
+		orr	r5, r5, r4, pull #\pull
+		mov	r4, r4, push #\push
+		orr	r4, r4, r3, pull #\pull
+		stmdb	dst!, {r4 - r9, ip, lr}
+		bge	29b
+	PLD(	cmn	r2, #96			)
+	PLD(	bge	30b			)
+	PLD(	add	r2, r2, #96		)
+		cmn	r2, #16
+		blt	32f
+31:		mov	r7, r3, push #\push
+		ldmdb	src!, {r3 - r6}
+		sub	r2, r2, #16
+		orr	r7, r7, r6, pull #\pull
+		mov	r6, r6, push #\push
+		orr	r6, r6, r5, pull #\pull
+		mov	r5, r5, push #\push
+		orr	r5, r5, r4, pull #\pull
+		mov	r4, r4, push #\push
+		orr	r4, r4, r3, pull #\pull
+		stmdb	dst!, {r4 - r7}
+32:		adds	r2, r2, #28
+		ldmfd	sp!, {r5 - r9}
+		blt	34f
+33:		mov	r4, r3, push #\push
+		ldr	r3, [src, #-4]!
+		subs	r2, r2, #4
+		orr	r4, r4, r3, pull #\pull
+		str	r4, [dst, #-4]!
+		bge	33b
+34:
+		.endm
+
+
+		backward_copy_shift	push=8	pull=24
+		add	src, src, #3
+		b	25b
+
+35:		backward_copy_shift	push=16	pull=16
+		add	src, src, #2
+		b	25b
+
+36:		backward_copy_shift	push=24	pull=8
+		add	src, src, #1
+		b	25b
+
+		.size	bcopy, . - bcopy
+END(bcopy)

--- /dev/null	2004-02-02 20:32:13.000000000 +0000
+++ sysdeps/arm/memcpy.S	2004-05-02 14:33:22.000000000 +0100
@@ -0,0 +1,242 @@
+/*
+ *   Optimized memcpy implementation for ARM processors
+ *
+ *	Author: 	Nicolas Pitre
+ *	Created:	Dec 23, 2003
+ *	Copyright:	(C) MontaVista Software, Inc.
+ *
+ *   This file 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.
+ *
+ *   This file 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.
+ */
+
+#include <sysdep.h>
+
+
+/*
+ * Endian independent macros for shifting bytes within registers.
+ */
+#ifndef __ARMEB__
+#define pull            lsr
+#define push            lsl
+#else
+#define pull            lsl
+#define push            lsr
+#endif
+
+/*
+ * Enable data preload for architectures that support it (ARMv5 and above)
+ */
+#if defined(__ARM_ARCH_5__) || \
+    defined(__ARM_ARCH_5T__) || \
+    defined(__ARM_ARCH_5TE__)
+#define PLD(code...)	code
+#else
+#define PLD(code...)
+#endif
+
+
+/* char * memcpy (char *dst, const char *src) */
+
+ENTRY(memcpy)
+		subs	r2, r2, #4
+		stmfd	sp!, {r0, r4, lr}
+		blt	7f
+		ands	ip, r0, #3
+	PLD(	pld	[r1, #0]		)
+		bne	8f
+		ands	ip, r1, #3
+		bne	9f
+
+1:		subs	r2, r2, #4
+		blt	6f
+		subs	r2, r2, #8
+		blt	5f
+		subs	r2, r2, #16
+		blt	4f
+
+	PLD(	subs	r2, r2, #65		)
+		stmfd	sp!, {r5 - r8}
+	PLD(	blt	3f			)
+	PLD(	pld	[r1, #32]		)
+
+	PLD(	@ cache alignment		)
+	PLD(	ands	ip, r1, #31		)
+	PLD(	pld	[r1, #64]		)
+	PLD(	beq	2f			)
+	PLD(	rsb	ip, ip, #32		)
+	PLD(	cmp	r2, ip			)
+	PLD(	pld	[r1, #96]		)
+	PLD(	blt	2f			)
+	PLD(	cmp	ip, #16			)
+	PLD(	sub	r2, r2, ip		)
+	PLD(	ldmgeia	r1!, {r3 - r6}		)
+	PLD(	stmgeia	r0!, {r3 - r6}		)
+	PLD(	beq	2f			)
+	PLD(	and	ip, ip, #15		)
+	PLD(	cmp	ip, #8			)
+	PLD(	ldr	r3, [r1], #4		)
+	PLD(	ldrge	r4, [r1], #4		)
+	PLD(	ldrgt	r5, [r1], #4		)
+	PLD(	str	r3, [r0], #4		)
+	PLD(	strge	r4, [r0], #4		)
+	PLD(	strgt	r5, [r0], #4		)
+
+2:	PLD(	pld	[r1, #96]		)
+3:		ldmia	r1!, {r3 - r8, ip, lr}
+		subs	r2, r2, #32
+		stmia	r0!, {r3 - r8, ip, lr}
+		bge	2b
+	PLD(	cmn	r2, #65			)
+	PLD(	bge	3b			)
+	PLD(	add	r2, r2, #65		)
+		tst	r2, #31
+		ldmfd	sp!, {r5 - r8}
+		ldmeqfd	sp!, {r0, r4, pc}
+
+		tst	r2, #16
+4:		ldmneia	r1!, {r3, r4, ip, lr}
+		stmneia	r0!, {r3, r4, ip, lr}
+
+		tst	r2, #8
+5:		ldmneia	r1!, {r3, r4}
+		stmneia	r0!, {r3, r4}
+
+		tst	r2, #4
+6:		ldrne	r3, [r1], #4
+		strne	r3, [r0], #4
+
+7:		ands	r2, r2, #3
+		ldmeqfd	sp!, {r0, r4, pc}
+
+		cmp	r2, #2
+		ldrb	r3, [r1], #1
+		ldrgeb	r4, [r1], #1
+		ldrgtb	ip, [r1]
+		strb	r3, [r0], #1
+		strgeb	r4, [r0], #1
+		strgtb	ip, [r0]
+		ldmfd	sp!, {r0, r4, pc}
+
+8:		rsb	ip, ip, #4
+		cmp	ip, #2
+		ldrb	r3, [r1], #1
+		ldrgeb	r4, [r1], #1
+		ldrgtb	lr, [r1], #1
+		strb	r3, [r0], #1
+		strgeb	r4, [r0], #1
+		strgtb	lr, [r0], #1
+		subs	r2, r2, ip
+		blt	7b
+		ands	ip, r1, #3
+		beq	1b
+
+9:		bic	r1, r1, #3
+		cmp	ip, #2
+		ldr	lr, [r1], #4
+		beq	17f
+		bgt	18f
+
+
+		.macro	forward_copy_shift pull push
+
+		cmp	r2, #12
+	PLD(	pld	[r1, #0]		)
+		blt	15f
+		subs	r2, r2, #28
+		stmfd	sp!, {r5 - r9}
+		blt	13f
+
+	PLD(	subs	r2, r2, #97		)
+	PLD(	blt	12f			)
+	PLD(	pld	[r1, #32]		)
+
+	PLD(	@ cache alignment		)
+	PLD(	rsb	ip, r1, #36		)
+	PLD(	pld	[r1, #64]		)
+	PLD(	ands	ip, ip, #31		)
+	PLD(	pld	[r1, #96]		)
+	PLD(	beq	11f			)
+	PLD(	cmp	r2, ip			)
+	PLD(	pld	[r1, #128]		)
+	PLD(	blt	11f			)
+	PLD(	sub	r2, r2, ip		)
+10:	PLD(	mov	r3, lr, pull #\pull	)
+	PLD(	ldr	lr, [r1], #4		)
+	PLD(	subs	ip, ip, #4		)
+	PLD(	orr	r3, r3, lr, push #\push	)
+	PLD(	str	r3, [r0], #4		)
+	PLD(	bgt	10b			)
+
+11:	PLD(	pld	[r1, #128]		)
+12:		mov	r3, lr, pull #\pull
+		ldmia	r1!, {r4 - r9, ip, lr}
+		subs	r2, r2, #32
+		orr	r3, r3, r4, push #\push
+		mov	r4, r4, pull #\pull
+		orr	r4, r4, r5, push #\push
+		mov	r5, r5, pull #\pull
+		orr	r5, r5, r6, push #\push
+		mov	r6, r6, pull #\pull
+		orr	r6, r6, r7, push #\push
+		mov	r7, r7, pull #\pull
+		orr	r7, r7, r8, push #\push
+		mov	r8, r8, pull #\pull
+		orr	r8, r8, r9, push #\push
+		mov	r9, r9, pull #\pull
+		orr	r9, r9, ip, push #\push
+		mov	ip, ip, pull #\pull
+		orr	ip, ip, lr, push #\push
+		stmia	r0!, {r3 - r9, ip}
+		bge	11b
+	PLD(	cmn	r2, #97			)
+	PLD(	bge	12b			)
+	PLD(	add	r2, r2, #97		)
+		cmn	r2, #16
+		blt	14f
+13:		mov	r3, lr, pull #\pull
+		ldmia	r1!, {r4 - r6, lr}
+		sub	r2, r2, #16
+		orr	r3, r3, r4, push #\push
+		mov	r4, r4, pull #\pull
+		orr	r4, r4, r5, push #\push
+		mov	r5, r5, pull #\pull
+		orr	r5, r5, r6, push #\push
+		mov	r6, r6, pull #\pull
+		orr	r6, r6, lr, push #\push
+		stmia	r0!, {r3 - r6}
+14:		adds	r2, r2, #28
+		ldmfd	sp!, {r5 - r9}
+		blt	16f
+15:		mov	r3, lr, pull #\pull
+		ldr	lr, [r1], #4
+		subs	r2, r2, #4
+		orr	r3, r3, lr, push #\push
+		str	r3, [r0], #4
+		bge	15b
+16:
+		.endm
+
+
+		forward_copy_shift	pull=8	push=24
+		sub	r1, r1, #3
+		b	7b
+
+17:		forward_copy_shift	pull=16	push=16
+		sub	r1, r1, #2
+		b	7b
+
+18:		forward_copy_shift	pull=24	push=8
+		sub	r1, r1, #1
+		b	7b
+
+		.size	memcpy, . - memcpy
+END(memcpy)
+libc_hidden_builtin_def (memcpy)
+