summaryrefslogtreecommitdiffstats
path: root/arch/sparc/lib/U3memcpy.S
blob: 5a8cb37f0a3b8e31d0a4194d831bb39559bb6a51 (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
/* U3memcpy.S: UltraSparc-III optimized memcpy.
 *
 * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
 */

#ifdef __KERNEL__
#include <linux/linkage.h>
#include <asm/visasm.h>
#include <asm/asi.h>
#define GLOBAL_SPARE	%g7
#else
#define ASI_BLK_P 0xf0
#define FPRS_FEF  0x04
#ifdef MEMCPY_DEBUG
#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs; \
		     clr %g1; clr %g2; clr %g3; subcc %g0, %g0, %g0;
#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
#else
#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
#endif
#define GLOBAL_SPARE	%g5
#endif

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

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

#ifndef LOAD
#define LOAD(type,addr,dest)	type [addr], dest
#endif

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

#ifndef STORE_BLK
#define STORE_BLK(src,addr)	stda src, [addr] ASI_BLK_P
#endif

#ifndef FUNC_NAME
#define FUNC_NAME	U3memcpy
#endif

#ifndef PREAMBLE
#define PREAMBLE
#endif

#ifndef XCC
#define XCC xcc
#endif

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

	/* Special/non-trivial issues of this code:
	 *
	 * 1) %o5 is preserved from VISEntryHalf to VISExitHalf
	 * 2) Only low 32 FPU registers are used so that only the
	 *    lower half of the FPU register set is dirtied by this
	 *    code.  This is especially important in the kernel.
	 * 3) This code never prefetches cachelines past the end
	 *    of the source buffer.
	 */

	.text
#ifndef EX_RETVAL
#define EX_RETVAL(x)	x
__restore_fp:
	VISExitHalf
	retl
	 nop
ENTRY(U3_retl_o2_plus_g2_plus_g1_plus_1_fp)
	add	%g1, 1, %g1
	add	%g2, %g1, %g2
	ba,pt	%xcc, __restore_fp
	 add	%o2, %g2, %o0
ENDPROC(U3_retl_o2_plus_g2_plus_g1_plus_1_fp)
ENTRY(U3_retl_o2_plus_g2_fp)
	ba,pt	%xcc, __restore_fp
	 add	%o2, %g2, %o0
ENDPROC(U3_retl_o2_plus_g2_fp)
ENTRY(U3_retl_o2_plus_g2_plus_8_fp)
	add	%g2, 8, %g2
	ba,pt	%xcc, __restore_fp
	 add	%o2, %g2, %o0
ENDPROC(U3_retl_o2_plus_g2_plus_8_fp)
ENTRY(U3_retl_o2)
	retl
	 mov	%o2, %o0
ENDPROC(U3_retl_o2)
ENTRY(U3_retl_o2_plus_1)
	retl
	 add	%o2, 1, %o0
ENDPROC(U3_retl_o2_plus_1)
ENTRY(U3_retl_o2_plus_4)
	retl
	 add	%o2, 4, %o0
ENDPROC(U3_retl_o2_plus_4)
ENTRY(U3_retl_o2_plus_8)
	retl
	 add	%o2, 8, %o0
ENDPROC(U3_retl_o2_plus_8)
ENTRY(U3_retl_o2_plus_g1_plus_1)
	add	%g1, 1, %g1
	retl
	 add	%o2, %g1, %o0
ENDPROC(U3_retl_o2_plus_g1_plus_1)
ENTRY(U3_retl_o2_fp)
	ba,pt	%xcc, __restore_fp
	 mov	%o2, %o0
ENDPROC(U3_retl_o2_fp)
ENTRY(U3_retl_o2_plus_o3_sll_6_plus_0x80_fp)
	sll	%o3, 6, %o3
	add	%o3, 0x80, %o3
	ba,pt	%xcc, __restore_fp
	 add	%o2, %o3, %o0
ENDPROC(U3_retl_o2_plus_o3_sll_6_plus_0x80_fp)
ENTRY(U3_retl_o2_plus_o3_sll_6_plus_0x40_fp)
	sll	%o3, 6, %o3
	add	%o3, 0x40, %o3
	ba,pt	%xcc, __restore_fp
	 add	%o2, %o3, %o0
ENDPROC(U3_retl_o2_plus_o3_sll_6_plus_0x40_fp)
ENTRY(U3_retl_o2_plus_GS_plus_0x10)
	add	GLOBAL_SPARE, 0x10, GLOBAL_SPARE
	retl
	 add	%o2, GLOBAL_SPARE, %o0
ENDPROC(U3_retl_o2_plus_GS_plus_0x10)
ENTRY(U3_retl_o2_plus_GS_plus_0x08)
	add	GLOBAL_SPARE, 0x08, GLOBAL_SPARE
	retl
	 add	%o2, GLOBAL_SPARE, %o0
ENDPROC(U3_retl_o2_plus_GS_plus_0x08)
ENTRY(U3_retl_o2_and_7_plus_GS)
	and	%o2, 7, %o2
	retl
	 add	%o2, GLOBAL_SPARE, %o0
ENDPROC(U3_retl_o2_and_7_plus_GS)
ENTRY(U3_retl_o2_and_7_plus_GS_plus_8)
	add	GLOBAL_SPARE, 8, GLOBAL_SPARE
	and	%o2, 7, %o2
	retl
	 add	%o2, GLOBAL_SPARE, %o0
ENDPROC(U3_retl_o2_and_7_plus_GS_plus_8)
#endif

	.align		64

	/* The cheetah's flexible spine, oversized liver, enlarged heart,
	 * slender muscular body, and claws make it the swiftest hunter
	 * in Africa and the fastest animal on land.  Can reach speeds
	 * of up to 2.4GB per second.
	 */

	.globl	FUNC_NAME
	.type	FUNC_NAME,#function
FUNC_NAME:	/* %o0=dst, %o1=src, %o2=len */
	srlx		%o2, 31, %g2
	cmp		%g2, 0
	tne		%xcc, 5
	PREAMBLE
	mov		%o0, %o4
	cmp		%o2, 0
	be,pn		%XCC, 85f
	 or		%o0, %o1, %o3
	cmp		%o2, 16
	blu,a,pn	%XCC, 80f
	 or		%o3, %o2, %o3

	cmp		%o2, (3 * 64)
	blu,pt		%XCC, 70f
	 andcc		%o3, 0x7, %g0

	/* Clobbers o5/g1/g2/g3/g7/icc/xcc.  We must preserve
	 * o5 from here until we hit VISExitHalf.
	 */
	VISEntryHalf

	/* Is 'dst' already aligned on an 64-byte boundary? */
	andcc		%o0, 0x3f, %g2
	be,pt		%XCC, 2f

	/* Compute abs((dst & 0x3f) - 0x40) into %g2.  This is the number
	 * of bytes to copy to make 'dst' 64-byte aligned.  We pre-
	 * subtract this from 'len'.
	 */
	 sub		%o0, %o1, GLOBAL_SPARE
	sub		%g2, 0x40, %g2
	sub		%g0, %g2, %g2
	sub		%o2, %g2, %o2
	andcc		%g2, 0x7, %g1
	be,pt		%icc, 2f
	 and		%g2, 0x38, %g2

1:	subcc		%g1, 0x1, %g1
	EX_LD_FP(LOAD(ldub, %o1 + 0x00, %o3), U3_retl_o2_plus_g2_plus_g1_plus_1)
	EX_ST_FP(STORE(stb, %o3, %o1 + GLOBAL_SPARE), U3_retl_o2_plus_g2_plus_g1_plus_1)
	bgu,pt		%XCC, 1b
	 add		%o1, 0x1, %o1

	add		%o1, GLOBAL_SPARE, %o0

2:	cmp		%g2, 0x0
	and		%o1, 0x7, %g1
	be,pt		%icc, 3f
	 alignaddr	%o1, %g0, %o1

	EX_LD_FP(LOAD(ldd, %o1, %f4), U3_retl_o2_plus_g2)
1:	EX_LD_FP(LOAD(ldd, %o1 + 0x8, %f6), U3_retl_o2_plus_g2)
	add		%o1, 0x8, %o1
	subcc		%g2, 0x8, %g2
	faligndata	%f4, %f6, %f0
	EX_ST_FP(STORE(std, %f0, %o0), U3_retl_o2_plus_g2_plus_8)
	be,pn		%icc, 3f
	 add		%o0, 0x8, %o0

	EX_LD_FP(LOAD(ldd, %o1 + 0x8, %f4), U3_retl_o2_plus_g2)
	add		%o1, 0x8, %o1
	subcc		%g2, 0x8, %g2
	faligndata	%f6, %f4, %f2
	EX_ST_FP(STORE(std, %f2, %o0), U3_retl_o2_plus_g2_plus_8)
	bne,pt		%icc, 1b
	 add		%o0, 0x8, %o0

3:	LOAD(prefetch, %o1 + 0x000, #one_read)
	LOAD(prefetch, %o1 + 0x040, #one_read)
	andn		%o2, (0x40 - 1), GLOBAL_SPARE
	LOAD(prefetch, %o1 + 0x080, #one_read)
	LOAD(prefetch, %o1 + 0x0c0, #one_read)
	LOAD(prefetch, %o1 + 0x100, #one_read)
	EX_LD_FP(LOAD(ldd, %o1 + 0x000, %f0), U3_retl_o2)
	LOAD(prefetch, %o1 + 0x140, #one_read)
	EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2), U3_retl_o2)
	LOAD(prefetch, %o1 + 0x180, #one_read)
	EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4), U3_retl_o2)
	LOAD(prefetch, %o1 + 0x1c0, #one_read)
	faligndata	%f0, %f2, %f16
	EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6), U3_retl_o2)
	faligndata	%f2, %f4, %f18
	EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8), U3_retl_o2)
	faligndata	%f4, %f6, %f20
	EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10), U3_retl_o2)
	faligndata	%f6, %f8, %f22

	EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12), U3_retl_o2)
	faligndata	%f8, %f10, %f24
	EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14), U3_retl_o2)
	faligndata	%f10, %f12, %f26
	EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0), U3_retl_o2)

	subcc		GLOBAL_SPARE, 0x80, GLOBAL_SPARE
	add		%o1, 0x40, %o1
	bgu,pt		%XCC, 1f
	 srl		GLOBAL_SPARE, 6, %o3
	ba,pt		%xcc, 2f
	 nop

	.align		64
1:
	EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2), U3_retl_o2_plus_o3_sll_6_plus_0x80)
	faligndata	%f12, %f14, %f28
	EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4), U3_retl_o2_plus_o3_sll_6_plus_0x80)
	faligndata	%f14, %f0, %f30
	EX_ST_FP(STORE_BLK(%f16, %o0), U3_retl_o2_plus_o3_sll_6_plus_0x80)
	EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	faligndata	%f0, %f2, %f16
	add		%o0, 0x40, %o0

	EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	faligndata	%f2, %f4, %f18
	EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	faligndata	%f4, %f6, %f20
	EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	subcc		%o3, 0x01, %o3
	faligndata	%f6, %f8, %f22
	EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14), U3_retl_o2_plus_o3_sll_6_plus_0x80)

	faligndata	%f8, %f10, %f24
	EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0), U3_retl_o2_plus_o3_sll_6_plus_0x80)
	LOAD(prefetch, %o1 + 0x1c0, #one_read)
	faligndata	%f10, %f12, %f26
	bg,pt		%XCC, 1b
	 add		%o1, 0x40, %o1

	/* Finally we copy the last full 64-byte block. */
2:
	EX_LD_FP(LOAD(ldd, %o1 + 0x008, %f2), U3_retl_o2_plus_o3_sll_6_plus_0x80)
	faligndata	%f12, %f14, %f28
	EX_LD_FP(LOAD(ldd, %o1 + 0x010, %f4), U3_retl_o2_plus_o3_sll_6_plus_0x80)
	faligndata	%f14, %f0, %f30
	EX_ST_FP(STORE_BLK(%f16, %o0), U3_retl_o2_plus_o3_sll_6_plus_0x80)
	EX_LD_FP(LOAD(ldd, %o1 + 0x018, %f6), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	faligndata	%f0, %f2, %f16
	EX_LD_FP(LOAD(ldd, %o1 + 0x020, %f8), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	faligndata	%f2, %f4, %f18
	EX_LD_FP(LOAD(ldd, %o1 + 0x028, %f10), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	faligndata	%f4, %f6, %f20
	EX_LD_FP(LOAD(ldd, %o1 + 0x030, %f12), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	faligndata	%f6, %f8, %f22
	EX_LD_FP(LOAD(ldd, %o1 + 0x038, %f14), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	faligndata	%f8, %f10, %f24
	cmp		%g1, 0
	be,pt		%XCC, 1f
	 add		%o0, 0x40, %o0
	EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0), U3_retl_o2_plus_o3_sll_6_plus_0x40)
1:	faligndata	%f10, %f12, %f26
	faligndata	%f12, %f14, %f28
	faligndata	%f14, %f0, %f30
	EX_ST_FP(STORE_BLK(%f16, %o0), U3_retl_o2_plus_o3_sll_6_plus_0x40)
	add		%o0, 0x40, %o0
	add		%o1, 0x40, %o1
	membar		#Sync

	/* Now we copy the (len modulo 64) bytes at the end.
	 * Note how we borrow the %f0 loaded above.
	 *
	 * Also notice how this code is careful not to perform a
	 * load past the end of the src buffer.
	 */
	and		%o2, 0x3f, %o2
	andcc		%o2, 0x38, %g2
	be,pn		%XCC, 2f
	 subcc		%g2, 0x8, %g2
	be,pn		%XCC, 2f
	 cmp		%g1, 0

	sub		%o2, %g2, %o2
	be,a,pt		%XCC, 1f
	 EX_LD_FP(LOAD(ldd, %o1 + 0x00, %f0), U3_retl_o2_plus_g2)

1:	EX_LD_FP(LOAD(ldd, %o1 + 0x08, %f2), U3_retl_o2_plus_g2)
	add		%o1, 0x8, %o1
	subcc		%g2, 0x8, %g2
	faligndata	%f0, %f2, %f8
	EX_ST_FP(STORE(std, %f8, %o0), U3_retl_o2_plus_g2_plus_8)
	be,pn		%XCC, 2f
	 add		%o0, 0x8, %o0
	EX_LD_FP(LOAD(ldd, %o1 + 0x08, %f0), U3_retl_o2_plus_g2)
	add		%o1, 0x8, %o1
	subcc		%g2, 0x8, %g2
	faligndata	%f2, %f0, %f8
	EX_ST_FP(STORE(std, %f8, %o0), U3_retl_o2_plus_g2_plus_8)
	bne,pn		%XCC, 1b
	 add		%o0, 0x8, %o0

	/* If anything is left, we copy it one byte at a time.
	 * Note that %g1 is (src & 0x3) saved above before the
	 * alignaddr was performed.
	 */
2:
	cmp		%o2, 0
	add		%o1, %g1, %o1
	VISExitHalf
	be,pn		%XCC, 85f
	 sub		%o0, %o1, %o3

	andcc		%g1, 0x7, %g0
	bne,pn		%icc, 90f
	 andcc		%o2, 0x8, %g0
	be,pt		%icc, 1f
	 nop
	EX_LD(LOAD(ldx, %o1, %o5), U3_retl_o2)
	EX_ST(STORE(stx, %o5, %o1 + %o3), U3_retl_o2)
	add		%o1, 0x8, %o1
	sub		%o2, 8, %o2

1:	andcc		%o2, 0x4, %g0
	be,pt		%icc, 1f
	 nop
	EX_LD(LOAD(lduw, %o1, %o5), U3_retl_o2)
	EX_ST(STORE(stw, %o5, %o1 + %o3), U3_retl_o2)
	add		%o1, 0x4, %o1
	sub		%o2, 4, %o2

1:	andcc		%o2, 0x2, %g0
	be,pt		%icc, 1f
	 nop
	EX_LD(LOAD(lduh, %o1, %o5), U3_retl_o2)
	EX_ST(STORE(sth, %o5, %o1 + %o3), U3_retl_o2)
	add		%o1, 0x2, %o1
	sub		%o2, 2, %o2

1:	andcc		%o2, 0x1, %g0
	be,pt		%icc, 85f
	 nop
	EX_LD(LOAD(ldub, %o1, %o5), U3_retl_o2)
	ba,pt		%xcc, 85f
	 EX_ST(STORE(stb, %o5, %o1 + %o3), U3_retl_o2)

	.align		64
70: /* 16 < len <= 64 */
	bne,pn		%XCC, 75f
	 sub		%o0, %o1, %o3

72:
	andn		%o2, 0xf, GLOBAL_SPARE
	and		%o2, 0xf, %o2
1:	subcc		GLOBAL_SPARE, 0x10, GLOBAL_SPARE
	EX_LD(LOAD(ldx, %o1 + 0x00, %o5), U3_retl_o2_plus_GS_plus_0x10)
	EX_LD(LOAD(ldx, %o1 + 0x08, %g1), U3_retl_o2_plus_GS_plus_0x10)
	EX_ST(STORE(stx, %o5, %o1 + %o3), U3_retl_o2_plus_GS_plus_0x10)
	add		%o1, 0x8, %o1
	EX_ST(STORE(stx, %g1, %o1 + %o3), U3_retl_o2_plus_GS_plus_0x08)
	bgu,pt		%XCC, 1b
	 add		%o1, 0x8, %o1
73:	andcc		%o2, 0x8, %g0
	be,pt		%XCC, 1f
	 nop
	sub		%o2, 0x8, %o2
	EX_LD(LOAD(ldx, %o1, %o5), U3_retl_o2_plus_8)
	EX_ST(STORE(stx, %o5, %o1 + %o3), U3_retl_o2_plus_8)
	add		%o1, 0x8, %o1
1:	andcc		%o2, 0x4, %g0
	be,pt		%XCC, 1f
	 nop
	sub		%o2, 0x4, %o2
	EX_LD(LOAD(lduw, %o1, %o5), U3_retl_o2_plus_4)
	EX_ST(STORE(stw, %o5, %o1 + %o3), U3_retl_o2_plus_4)
	add		%o1, 0x4, %o1
1:	cmp		%o2, 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		%o2, %g1, %o2

1:	subcc		%g1, 1, %g1
	EX_LD(LOAD(ldub, %o1, %o5), U3_retl_o2_plus_g1_plus_1)
	EX_ST(STORE(stb, %o5, %o1 + %o3), U3_retl_o2_plus_g1_plus_1)
	bgu,pt		%icc, 1b
	 add		%o1, 1, %o1

2:	add		%o1, %o3, %o0
	andcc		%o1, 0x7, %g1
	bne,pt		%icc, 8f
	 sll		%g1, 3, %g1

	cmp		%o2, 16
	bgeu,pt		%icc, 72b
	 nop
	ba,a,pt		%xcc, 73b

8:	mov		64, %o3
	andn		%o1, 0x7, %o1
	EX_LD(LOAD(ldx, %o1, %g2), U3_retl_o2)
	sub		%o3, %g1, %o3
	andn		%o2, 0x7, GLOBAL_SPARE
	sllx		%g2, %g1, %g2
1:	EX_LD(LOAD(ldx, %o1 + 0x8, %g3), U3_retl_o2_and_7_plus_GS)
	subcc		GLOBAL_SPARE, 0x8, GLOBAL_SPARE
	add		%o1, 0x8, %o1
	srlx		%g3, %o3, %o5
	or		%o5, %g2, %o5
	EX_ST(STORE(stx, %o5, %o0), U3_retl_o2_and_7_plus_GS_plus_8)
	add		%o0, 0x8, %o0
	bgu,pt		%icc, 1b
	 sllx		%g3, %g1, %g2

	srl		%g1, 3, %g1
	andcc		%o2, 0x7, %o2
	be,pn		%icc, 85f
	 add		%o1, %g1, %o1
	ba,pt		%xcc, 90f
	 sub		%o0, %o1, %o3

	.align		64
80: /* 0 < len <= 16 */
	andcc		%o3, 0x3, %g0
	bne,pn		%XCC, 90f
	 sub		%o0, %o1, %o3

1:
	subcc		%o2, 4, %o2
	EX_LD(LOAD(lduw, %o1, %g1), U3_retl_o2_plus_4)
	EX_ST(STORE(stw, %g1, %o1 + %o3), U3_retl_o2_plus_4)
	bgu,pt		%XCC, 1b
	 add		%o1, 4, %o1

85:	retl
	 mov		EX_RETVAL(%o4), %o0

	.align		32
90:
	subcc		%o2, 1, %o2
	EX_LD(LOAD(ldub, %o1, %g1), U3_retl_o2_plus_1)
	EX_ST(STORE(stb, %g1, %o1 + %o3), U3_retl_o2_plus_1)
	bgu,pt		%XCC, 90b
	 add		%o1, 1, %o1
	retl
	 mov		EX_RETVAL(%o4), %o0

	.size		FUNC_NAME, .-FUNC_NAME