summaryrefslogtreecommitdiffstats
path: root/arch/sparc/lib/NGmemcpy.S
blob: d88c4ed50a0023cd8e2daa06689abc0d46d79f46 (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
/* NGmemcpy.S: Niagara optimized memcpy.
 *
 * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
 */

#ifdef __KERNEL__
#include <linux/linkage.h>
#include <asm/asi.h>
#include <asm/thread_info.h>
#define GLOBAL_SPARE	%g7
#define RESTORE_ASI(TMP)	\
	ldub	[%g6 + TI_CURRENT_DS], TMP;  \
	wr	TMP, 0x0, %asi;
#else
#define GLOBAL_SPARE	%g5
#define RESTORE_ASI(TMP)	\
	wr	%g0, ASI_PNF, %asi
#endif

#ifdef __sparc_v9__
#define SAVE_AMOUNT	128
#else
#define SAVE_AMOUNT	64
#endif

#ifndef STORE_ASI
#define STORE_ASI	ASI_BLK_INIT_QUAD_LDD_P
#endif

#ifndef EX_LD
#define EX_LD(x,y)	x
#endif

#ifndef EX_ST
#define EX_ST(x,y)	x
#endif

#ifndef LOAD
#ifndef MEMCPY_DEBUG
#define LOAD(type,addr,dest)	type [addr], dest
#else
#define LOAD(type,addr,dest)	type##a [addr] 0x80, dest
#endif
#endif

#ifndef LOAD_TWIN
#define LOAD_TWIN(addr_reg,dest0,dest1)	\
	ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_P, dest0
#endif

#ifndef STORE
#define STORE(type,src,addr)	type src, [addr]
#endif

#ifndef STORE_INIT
#ifndef SIMULATE_NIAGARA_ON_NON_NIAGARA
#define STORE_INIT(src,addr)	stxa src, [addr] %asi
#else
#define STORE_INIT(src,addr)	stx src, [addr + 0x00]
#endif
#endif

#ifndef FUNC_NAME
#define FUNC_NAME	NGmemcpy
#endif

#ifndef PREAMBLE
#define PREAMBLE
#endif

#ifndef XCC
#define XCC xcc
#endif

	.register	%g2,#scratch
	.register	%g3,#scratch

	.text
#ifndef EX_RETVAL
#define EX_RETVAL(x)	x
__restore_asi:
	ret
	wr	%g0, ASI_AIUS, %asi
	 restore
ENTRY(NG_ret_i2_plus_i4_plus_1)
	ba,pt	%xcc, __restore_asi
	 add	%i2, %i5, %i0
ENDPROC(NG_ret_i2_plus_i4_plus_1)
ENTRY(NG_ret_i2_plus_g1)
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1)
ENTRY(NG_ret_i2_plus_g1_minus_8)
	sub	%g1, 8, %g1
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1_minus_8)
ENTRY(NG_ret_i2_plus_g1_minus_16)
	sub	%g1, 16, %g1
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1_minus_16)
ENTRY(NG_ret_i2_plus_g1_minus_24)
	sub	%g1, 24, %g1
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1_minus_24)
ENTRY(NG_ret_i2_plus_g1_minus_32)
	sub	%g1, 32, %g1
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1_minus_32)
ENTRY(NG_ret_i2_plus_g1_minus_40)
	sub	%g1, 40, %g1
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1_minus_40)
ENTRY(NG_ret_i2_plus_g1_minus_48)
	sub	%g1, 48, %g1
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1_minus_48)
ENTRY(NG_ret_i2_plus_g1_minus_56)
	sub	%g1, 56, %g1
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1_minus_56)
ENTRY(NG_ret_i2_plus_i4)
	ba,pt	%xcc, __restore_asi
	 add	%i2, %i4, %i0
ENDPROC(NG_ret_i2_plus_i4)
ENTRY(NG_ret_i2_plus_i4_minus_8)
	sub	%i4, 8, %i4
	ba,pt	%xcc, __restore_asi
	 add	%i2, %i4, %i0
ENDPROC(NG_ret_i2_plus_i4_minus_8)
ENTRY(NG_ret_i2_plus_8)
	ba,pt	%xcc, __restore_asi
	 add	%i2, 8, %i0
ENDPROC(NG_ret_i2_plus_8)
ENTRY(NG_ret_i2_plus_4)
	ba,pt	%xcc, __restore_asi
	 add	%i2, 4, %i0
ENDPROC(NG_ret_i2_plus_4)
ENTRY(NG_ret_i2_plus_1)
	ba,pt	%xcc, __restore_asi
	 add	%i2, 1, %i0
ENDPROC(NG_ret_i2_plus_1)
ENTRY(NG_ret_i2_plus_g1_plus_1)
	add	%g1, 1, %g1
	ba,pt	%xcc, __restore_asi
	 add	%i2, %g1, %i0
ENDPROC(NG_ret_i2_plus_g1_plus_1)
ENTRY(NG_ret_i2)
	ba,pt	%xcc, __restore_asi
	 mov	%i2, %i0
ENDPROC(NG_ret_i2)
ENTRY(NG_ret_i2_and_7_plus_i4)
	and	%i2, 7, %i2
	ba,pt	%xcc, __restore_asi
	 add	%i2, %i4, %i0
ENDPROC(NG_ret_i2_and_7_plus_i4)
#endif

	.align		64

	.globl	FUNC_NAME
	.type	FUNC_NAME,#function
FUNC_NAME:	/* %i0=dst, %i1=src, %i2=len */
	PREAMBLE
	save		%sp, -SAVE_AMOUNT, %sp
	srlx		%i2, 31, %g2
	cmp		%g2, 0
	tne		%xcc, 5
	mov		%i0, %o0
	cmp		%i2, 0
	be,pn		%XCC, 85f
	 or		%o0, %i1, %i3
	cmp		%i2, 16
	blu,a,pn	%XCC, 80f
	 or		%i3, %i2, %i3

	/* 2 blocks (128 bytes) is the minimum we can do the block
	 * copy with.  We need to ensure that we'll iterate at least
	 * once in the block copy loop.  At worst we'll need to align
	 * the destination to a 64-byte boundary which can chew up
	 * to (64 - 1) bytes from the length before we perform the
	 * block copy loop.
	 */
	cmp		%i2, (2 * 64)
	blu,pt		%XCC, 70f
	 andcc		%i3, 0x7, %g0

	/* %o0:	dst
	 * %i1:	src
	 * %i2:	len  (known to be >= 128)
	 *
	 * The block copy loops will use %i4/%i5,%g2/%g3 as
	 * temporaries while copying the data.
	 */

	LOAD(prefetch, %i1, #one_read)
	wr		%g0, STORE_ASI, %asi

	/* Align destination on 64-byte boundary.  */
	andcc		%o0, (64 - 1), %i4
	be,pt		%XCC, 2f
	 sub		%i4, 64, %i4
	sub		%g0, %i4, %i4	! bytes to align dst
	sub		%i2, %i4, %i2
1:	subcc		%i4, 1, %i4
	EX_LD(LOAD(ldub, %i1, %g1), NG_ret_i2_plus_i4_plus_1)
	EX_ST(STORE(stb, %g1, %o0), NG_ret_i2_plus_i4_plus_1)
	add		%i1, 1, %i1
	bne,pt		%XCC, 1b
	add		%o0, 1, %o0

	/* If the source is on a 16-byte boundary we can do
	 * the direct block copy loop.  If it is 8-byte aligned
	 * we can do the 16-byte loads offset by -8 bytes and the
	 * init stores offset by one register.
	 *
	 * If the source is not even 8-byte aligned, we need to do
	 * shifting and masking (basically integer faligndata).
	 *
	 * The careful bit with init stores is that if we store
	 * to any part of the cache line we have to store the whole
	 * cacheline else we can end up with corrupt L2 cache line
	 * contents.  Since the loop works on 64-bytes of 64-byte
	 * aligned store data at a time, this is easy to ensure.
	 */
2:
	andcc		%i1, (16 - 1), %i4
	andn		%i2, (64 - 1), %g1	! block copy loop iterator
	be,pt		%XCC, 50f
	 sub		%i2, %g1, %i2		! final sub-block copy bytes

	cmp		%i4, 8
	be,pt		%XCC, 10f
	 sub		%i1, %i4, %i1

	/* Neither 8-byte nor 16-byte aligned, shift and mask.  */
	and		%i4, 0x7, GLOBAL_SPARE
	sll		GLOBAL_SPARE, 3, GLOBAL_SPARE
	mov		64, %i5
	EX_LD(LOAD_TWIN(%i1, %g2, %g3), NG_ret_i2_plus_g1)
	sub		%i5, GLOBAL_SPARE, %i5
	mov		16, %o4
	mov		32, %o5
	mov		48, %o7
	mov		64, %i3

	bg,pn	   	%XCC, 9f
	 nop

#define MIX_THREE_WORDS(WORD1, WORD2, WORD3, PRE_SHIFT, POST_SHIFT, TMP) \
	sllx		WORD1, POST_SHIFT, WORD1; \
	srlx		WORD2, PRE_SHIFT, TMP; \
	sllx		WORD2, POST_SHIFT, WORD2; \
	or		WORD1, TMP, WORD1; \
	srlx		WORD3, PRE_SHIFT, TMP; \
	or		WORD2, TMP, WORD2;

8:	EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3), NG_ret_i2_plus_g1)
	MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)
	LOAD(prefetch, %i1 + %i3, #one_read)

	EX_ST(STORE_INIT(%g2, %o0 + 0x00), NG_ret_i2_plus_g1)
	EX_ST(STORE_INIT(%g3, %o0 + 0x08), NG_ret_i2_plus_g1_minus_8)

	EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3), NG_ret_i2_plus_g1_minus_16)
	MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)

	EX_ST(STORE_INIT(%o2, %o0 + 0x10), NG_ret_i2_plus_g1_minus_16)
	EX_ST(STORE_INIT(%o3, %o0 + 0x18), NG_ret_i2_plus_g1_minus_24)

	EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3), NG_ret_i2_plus_g1_minus_32)
	MIX_THREE_WORDS(%g2, %g3, %o2, %i5, GLOBAL_SPARE, %o1)

	EX_ST(STORE_INIT(%g2, %o0 + 0x20), NG_ret_i2_plus_g1_minus_32)
	EX_ST(STORE_INIT(%g3, %o0 + 0x28), NG_ret_i2_plus_g1_minus_40)

	EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3), NG_ret_i2_plus_g1_minus_48)
	add		%i1, 64, %i1
	MIX_THREE_WORDS(%o2, %o3, %g2, %i5, GLOBAL_SPARE, %o1)

	EX_ST(STORE_INIT(%o2, %o0 + 0x30), NG_ret_i2_plus_g1_minus_48)
	EX_ST(STORE_INIT(%o3, %o0 + 0x38), NG_ret_i2_plus_g1_minus_56)

	subcc		%g1, 64, %g1
	bne,pt		%XCC, 8b
	 add		%o0, 64, %o0

	ba,pt		%XCC, 60f
	 add		%i1, %i4, %i1

9:	EX_LD(LOAD_TWIN(%i1 + %o4, %o2, %o3), NG_ret_i2_plus_g1)
	MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)
	LOAD(prefetch, %i1 + %i3, #one_read)

	EX_ST(STORE_INIT(%g3, %o0 + 0x00), NG_ret_i2_plus_g1)
	EX_ST(STORE_INIT(%o2, %o0 + 0x08), NG_ret_i2_plus_g1_minus_8)

	EX_LD(LOAD_TWIN(%i1 + %o5, %g2, %g3), NG_ret_i2_plus_g1_minus_16)
	MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)

	EX_ST(STORE_INIT(%o3, %o0 + 0x10), NG_ret_i2_plus_g1_minus_16)
	EX_ST(STORE_INIT(%g2, %o0 + 0x18), NG_ret_i2_plus_g1_minus_24)

	EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3), NG_ret_i2_plus_g1_minus_32)
	MIX_THREE_WORDS(%g3, %o2, %o3, %i5, GLOBAL_SPARE, %o1)

	EX_ST(STORE_INIT(%g3, %o0 + 0x20), NG_ret_i2_plus_g1_minus_32)
	EX_ST(STORE_INIT(%o2, %o0 + 0x28), NG_ret_i2_plus_g1_minus_40)

	EX_LD(LOAD_TWIN(%i1 + %i3, %g2, %g3), NG_ret_i2_plus_g1_minus_48)
	add		%i1, 64, %i1
	MIX_THREE_WORDS(%o3, %g2, %g3, %i5, GLOBAL_SPARE, %o1)

	EX_ST(STORE_INIT(%o3, %o0 + 0x30), NG_ret_i2_plus_g1_minus_48)
	EX_ST(STORE_INIT(%g2, %o0 + 0x38), NG_ret_i2_plus_g1_minus_56)

	subcc		%g1, 64, %g1
	bne,pt		%XCC, 9b
	 add		%o0, 64, %o0

	ba,pt		%XCC, 60f
	 add		%i1, %i4, %i1

10:	/* Destination is 64-byte aligned, source was only 8-byte
	 * aligned but it has been subtracted by 8 and we perform
	 * one twin load ahead, then add 8 back into source when
	 * we finish the loop.
	 */
	EX_LD(LOAD_TWIN(%i1, %o4, %o5), NG_ret_i2_plus_g1)
	mov	16, %o7
	mov	32, %g2
	mov	48, %g3
	mov	64, %o1
1:	EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3), NG_ret_i2_plus_g1)
	LOAD(prefetch, %i1 + %o1, #one_read)
	EX_ST(STORE_INIT(%o5, %o0 + 0x00), NG_ret_i2_plus_g1)	! initializes cache line
	EX_ST(STORE_INIT(%o2, %o0 + 0x08), NG_ret_i2_plus_g1_minus_8)
	EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5), NG_ret_i2_plus_g1_minus_16)
	EX_ST(STORE_INIT(%o3, %o0 + 0x10), NG_ret_i2_plus_g1_minus_16)
	EX_ST(STORE_INIT(%o4, %o0 + 0x18), NG_ret_i2_plus_g1_minus_24)
	EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3), NG_ret_i2_plus_g1_minus_32)
	EX_ST(STORE_INIT(%o5, %o0 + 0x20), NG_ret_i2_plus_g1_minus_32)
	EX_ST(STORE_INIT(%o2, %o0 + 0x28), NG_ret_i2_plus_g1_minus_40)
	EX_LD(LOAD_TWIN(%i1 + %o1, %o4, %o5), NG_ret_i2_plus_g1_minus_48)
	add		%i1, 64, %i1
	EX_ST(STORE_INIT(%o3, %o0 + 0x30), NG_ret_i2_plus_g1_minus_48)
	EX_ST(STORE_INIT(%o4, %o0 + 0x38), NG_ret_i2_plus_g1_minus_56)
	subcc		%g1, 64, %g1
	bne,pt		%XCC, 1b
	 add		%o0, 64, %o0

	ba,pt		%XCC, 60f
	 add		%i1, 0x8, %i1

50:	/* Destination is 64-byte aligned, and source is 16-byte
	 * aligned.
	 */
	mov	16, %o7
	mov	32, %g2
	mov	48, %g3
	mov	64, %o1
1:	EX_LD(LOAD_TWIN(%i1 + %g0, %o4, %o5), NG_ret_i2_plus_g1)
	EX_LD(LOAD_TWIN(%i1 + %o7, %o2, %o3), NG_ret_i2_plus_g1)
	LOAD(prefetch, %i1 + %o1, #one_read)
	EX_ST(STORE_INIT(%o4, %o0 + 0x00), NG_ret_i2_plus_g1)	! initializes cache line
	EX_ST(STORE_INIT(%o5, %o0 + 0x08), NG_ret_i2_plus_g1_minus_8)
	EX_LD(LOAD_TWIN(%i1 + %g2, %o4, %o5), NG_ret_i2_plus_g1_minus_16)
	EX_ST(STORE_INIT(%o2, %o0 + 0x10), NG_ret_i2_plus_g1_minus_16)
	EX_ST(STORE_INIT(%o3, %o0 + 0x18), NG_ret_i2_plus_g1_minus_24)
	EX_LD(LOAD_TWIN(%i1 + %g3, %o2, %o3), NG_ret_i2_plus_g1_minus_32)
	add	%i1, 64, %i1
	EX_ST(STORE_INIT(%o4, %o0 + 0x20), NG_ret_i2_plus_g1_minus_32)
	EX_ST(STORE_INIT(%o5, %o0 + 0x28), NG_ret_i2_plus_g1_minus_40)
	EX_ST(STORE_INIT(%o2, %o0 + 0x30), NG_ret_i2_plus_g1_minus_48)
	EX_ST(STORE_INIT(%o3, %o0 + 0x38), NG_ret_i2_plus_g1_minus_56)
	subcc	%g1, 64, %g1
	bne,pt	%XCC, 1b
	 add	%o0, 64, %o0
	/* fall through */

60:	
	membar		#Sync

	/* %i2 contains any final bytes still needed to be copied
	 * over. If anything is left, we copy it one byte at a time.
	 */
	RESTORE_ASI(%i3)
	brz,pt		%i2, 85f
	 sub		%o0, %i1, %i3
	ba,a,pt		%XCC, 90f

	.align		64
70: /* 16 < len <= 64 */
	bne,pn		%XCC, 75f
	 sub		%o0, %i1, %i3

72:
	andn		%i2, 0xf, %i4
	and		%i2, 0xf, %i2
1:	subcc		%i4, 0x10, %i4
	EX_LD(LOAD(ldx, %i1, %o4), NG_ret_i2_plus_i4)
	add		%i1, 0x08, %i1
	EX_LD(LOAD(ldx, %i1, %g1), NG_ret_i2_plus_i4)
	sub		%i1, 0x08, %i1
	EX_ST(STORE(stx, %o4, %i1 + %i3), NG_ret_i2_plus_i4)
	add		%i1, 0x8, %i1
	EX_ST(STORE(stx, %g1, %i1 + %i3), NG_ret_i2_plus_i4_minus_8)
	bgu,pt		%XCC, 1b
	 add		%i1, 0x8, %i1
73:	andcc		%i2, 0x8, %g0
	be,pt		%XCC, 1f
	 nop
	sub		%i2, 0x8, %i2
	EX_LD(LOAD(ldx, %i1, %o4), NG_ret_i2_plus_8)
	EX_ST(STORE(stx, %o4, %i1 + %i3), NG_ret_i2_plus_8)
	add		%i1, 0x8, %i1
1:	andcc		%i2, 0x4, %g0
	be,pt		%XCC, 1f
	 nop
	sub		%i2, 0x4, %i2
	EX_LD(LOAD(lduw, %i1, %i5), NG_ret_i2_plus_4)
	EX_ST(STORE(stw, %i5, %i1 + %i3), NG_ret_i2_plus_4)
	add		%i1, 0x4, %i1
1:	cmp		%i2, 0
	be,pt		%XCC, 85f
	 nop
	ba,pt		%xcc, 90f
	 nop

75:
	andcc		%o0, 0x7, %g1
	sub		%g1, 0x8, %g1
	be,pn		%icc, 2f
	 sub		%g0, %g1, %g1
	sub		%i2, %g1, %i2

1:	subcc		%g1, 1, %g1
	EX_LD(LOAD(ldub, %i1, %i5), NG_ret_i2_plus_g1_plus_1)
	EX_ST(STORE(stb, %i5, %i1 + %i3), NG_ret_i2_plus_g1_plus_1)
	bgu,pt		%icc, 1b
	 add		%i1, 1, %i1

2:	add		%i1, %i3, %o0
	andcc		%i1, 0x7, %g1
	bne,pt		%icc, 8f
	 sll		%g1, 3, %g1

	cmp		%i2, 16
	bgeu,pt		%icc, 72b
	 nop
	ba,a,pt		%xcc, 73b

8:	mov		64, %i3
	andn		%i1, 0x7, %i1
	EX_LD(LOAD(ldx, %i1, %g2), NG_ret_i2)
	sub		%i3, %g1, %i3
	andn		%i2, 0x7, %i4
	sllx		%g2, %g1, %g2
1:	add		%i1, 0x8, %i1
	EX_LD(LOAD(ldx, %i1, %g3), NG_ret_i2_and_7_plus_i4)
	subcc		%i4, 0x8, %i4
	srlx		%g3, %i3, %i5
	or		%i5, %g2, %i5
	EX_ST(STORE(stx, %i5, %o0), NG_ret_i2_and_7_plus_i4)
	add		%o0, 0x8, %o0
	bgu,pt		%icc, 1b
	 sllx		%g3, %g1, %g2

	srl		%g1, 3, %g1
	andcc		%i2, 0x7, %i2
	be,pn		%icc, 85f
	 add		%i1, %g1, %i1
	ba,pt		%xcc, 90f
	 sub		%o0, %i1, %i3

	.align		64
80: /* 0 < len <= 16 */
	andcc		%i3, 0x3, %g0
	bne,pn		%XCC, 90f
	 sub		%o0, %i1, %i3

1:
	subcc		%i2, 4, %i2
	EX_LD(LOAD(lduw, %i1, %g1), NG_ret_i2_plus_4)
	EX_ST(STORE(stw, %g1, %i1 + %i3), NG_ret_i2_plus_4)
	bgu,pt		%XCC, 1b
	 add		%i1, 4, %i1

85:	ret
	 restore	EX_RETVAL(%i0), %g0, %o0

	.align		32
90:
	subcc		%i2, 1, %i2
	EX_LD(LOAD(ldub, %i1, %g1), NG_ret_i2_plus_1)
	EX_ST(STORE(stb, %g1, %i1 + %i3), NG_ret_i2_plus_1)
	bgu,pt		%XCC, 90b
	 add		%i1, 1, %i1
	ret
	 restore	EX_RETVAL(%i0), %g0, %o0

	.size		FUNC_NAME, .-FUNC_NAME