summaryrefslogtreecommitdiffstats
path: root/arch/sh/lib/memcpy-sh4.S
blob: db6b736537adf9ff7e46f7aa7d69bd8260a83a19 (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
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
/*
 * "memcpy" implementation of SuperH
 *
 * Copyright (C) 1999  Niibe Yutaka
 * Copyright (c) 2002  STMicroelectronics Ltd
 *   Modified from memcpy.S and micro-optimised for SH4
 *   Stuart Menefy (stuart.menefy@st.com)
 *
 */
#include <linux/linkage.h>

/*
 * void *memcpy(void *dst, const void *src, size_t n);
 *
 * It is assumed that there is no overlap between src and dst.
 * If there is an overlap, then the results are undefined.
 */

	!
	!	GHIJ KLMN OPQR -->  ...G HIJK LMNO PQR.
	!

	! Size is 16 or greater, and may have trailing bytes

	.balign	32
.Lcase1:
	! Read a long word and write a long word at once
	! At the start of each iteration, r7 contains last long load
	add	#-1,r5		!  79 EX
	mov	r4,r2		!   5 MT (0 cycles latency)

	mov.l	@(r0,r5),r7	!  21 LS (2 cycles latency)
	add	#-4,r5		!  50 EX

	add	#7,r2		!  79 EX
	!
#ifdef CONFIG_CPU_LITTLE_ENDIAN
	! 6 cycles, 4 bytes per iteration
3:	mov.l	@(r0,r5),r1	!  21 LS (latency=2)	! NMLK
	mov	r7, r3		!   5 MT (latency=0)	! RQPO

	cmp/hi	r2,r0		!  57 MT
	shll16	r3		! 103 EX

	mov	r1,r6		!   5 MT (latency=0)
	shll8	r3		! 102 EX		! Oxxx

	shlr8	r6		! 106 EX		! xNML
	mov	r1, r7		!   5 MT (latency=0)

	or	r6,r3		!  82 EX		! ONML
	bt/s	3b		! 109 BR

	 mov.l	r3,@-r0		!  30 LS
#else
3:	mov.l	@(r0,r5),r1	!  21 LS (latency=2)	! KLMN
	mov	r7,r3		!   5 MT (latency=0)	! OPQR

	cmp/hi	r2,r0		!  57 MT
	shlr16	r3		! 107 EX

	shlr8	r3		! 106 EX		! xxxO
	mov	r1,r6		!   5 MT (latency=0)

	shll8	r6		! 102 EX		! LMNx
	mov	r1,r7		!   5 MT (latency=0)

	or	r6,r3		!  82 EX		! LMNO
	bt/s	3b		! 109 BR

	 mov.l	r3,@-r0		!  30 LS
#endif
	! Finally, copy a byte at once, if necessary

	add	#4,r5		!  50 EX
	cmp/eq	r4,r0		!  54 MT

	add	#-6,r2		!  50 EX
	bt	9f		! 109 BR

8:	cmp/hi	r2,r0		!  57 MT
	mov.b	@(r0,r5),r1	!  20 LS (latency=2)

	bt/s	8b		! 109 BR

	 mov.b	r1,@-r0		!  29 LS

9:	rts
	 nop


	!
	!	GHIJ KLMN OPQR -->  .GHI JKLM NOPQ R...
	!

	! Size is 16 or greater, and may have trailing bytes

	.balign	32
.Lcase3:
	! Read a long word and write a long word at once
	! At the start of each iteration, r7 contains last long load
	add	#-3,r5		! 79 EX
	mov	r4,r2		!  5 MT (0 cycles latency)

	mov.l	@(r0,r5),r7	! 21 LS (2 cycles latency)
	add	#-4,r5		! 50 EX

	add	#7,r2		!  79 EX
	!
#ifdef CONFIG_CPU_LITTLE_ENDIAN
	! 6 cycles, 4 bytes per iteration
3:	mov.l	@(r0,r5),r1	!  21 LS (latency=2)	! NMLK
	mov	r7, r3		!   5 MT (latency=0)	! RQPO

	cmp/hi	r2,r0		!  57 MT
	shll8	r3		! 102 EX		! QPOx

	mov	r1,r6		!   5 MT (latency=0)
	shlr16	r6		! 107 EX

	shlr8	r6		! 106 EX		! xxxN
	mov	r1, r7		!   5 MT (latency=0)

	or	r6,r3		!  82 EX		! QPON
	bt/s	3b		! 109 BR

	 mov.l	r3,@-r0		!  30 LS
#else
3:	mov	r1,r3		! OPQR
	shlr8	r3		! xOPQ
	mov.l	@(r0,r5),r1	! KLMN
	mov	r1,r6
	shll16	r6
	shll8	r6		! Nxxx
	or	r6,r3		! NOPQ
	cmp/hi	r2,r0
	bt/s	3b
	 mov.l	r3,@-r0
#endif

	! Finally, copy a byte at once, if necessary

	add	#6,r5		!  50 EX
	cmp/eq	r4,r0		!  54 MT

	add	#-6,r2		!  50 EX
	bt	9f		! 109 BR

8:	cmp/hi	r2,r0		!  57 MT
	mov.b	@(r0,r5),r1	!  20 LS (latency=2)

	bt/s	8b		! 109 BR

	 mov.b	r1,@-r0		!  29 LS

9:	rts
	 nop

ENTRY(memcpy)

	! Calculate the invariants which will be used in the remainder
	! of the code:
	!
	!      r4   -->  [ ...  ] DST             [ ...  ] SRC
	!	         [ ...  ]                 [ ...  ]
	!	           :                        :
	!      r0   -->  [ ...  ]       r0+r5 --> [ ...  ]
	!
	!

	! Short circuit the common case of src, dst and len being 32 bit aligned
	! and test for zero length move

	mov	r6, r0		!   5 MT (0 cycle latency)
	or	r4, r0		!  82 EX

	or	r5, r0		!  82 EX
	tst	r6, r6		!  86 MT

	bt/s	99f		! 111 BR		(zero len)
	 tst	#3, r0		!  87 MT

	mov	r4, r0		!   5 MT (0 cycle latency)
	add	r6, r0		!  49 EX

	mov	#16, r1		!   6 EX
	bt/s	.Lcase00	! 111 BR		(aligned)

	 sub	r4, r5		!  75 EX

	! Arguments are not nicely long word aligned or zero len.
	! Check for small copies, and if so do a simple byte at a time copy.
	!
	! Deciding on an exact value of 'small' is not easy, as the point at which
	! using the optimised routines become worthwhile varies (these are the
	! cycle counts for differnet sizes using byte-at-a-time vs. optimised):
	!	size	byte-at-time	long	word	byte
	!	16	42		39-40	46-50	50-55
	!	24	58		43-44	54-58	62-67
	!	36	82		49-50	66-70	80-85
	! However the penalty for getting it 'wrong' is much higher for long word
	! aligned data (and this is more common), so use a value of 16.

	cmp/gt	r6,r1		!  56 MT

	add	#-1,r5		!  50 EX
	bf/s	6f		! 108 BR		(not small)

	 mov	r5, r3		!   5 MT (latency=0)
	shlr	r6		! 104 EX

	mov.b	@(r0,r5),r1	!  20 LS (latency=2)
	bf/s	4f		! 111 BR

	 add	#-1,r3		!  50 EX
	tst	r6, r6		!  86 MT

	bt/s	98f		! 110 BR
	 mov.b	r1,@-r0		!  29 LS

	! 4 cycles, 2 bytes per iteration
3:	mov.b	@(r0,r5),r1	!  20 LS (latency=2)

4:	mov.b	@(r0,r3),r2	!  20 LS (latency=2)
	dt	r6		!  67 EX

	mov.b	r1,@-r0		!  29 LS
	bf/s	3b		! 111 BR

	 mov.b	r2,@-r0		!  29 LS
98:
	rts
	 nop

99:	rts
	 mov	r4, r0

	! Size is not small, so its worthwhile looking for optimisations.
	! First align destination to a long word boundary.
	!
	! r5 = normal value -1

6:	tst	#3, r0		!  87 MT
        mov	#3, r3		!   6 EX

	bt/s	2f		! 111 BR
	 and	r0,r3		!  78 EX

	! 3 cycles, 1 byte per iteration
1:	dt	r3		!  67 EX
	mov.b	@(r0,r5),r1	!  19 LS (latency=2)

	add	#-1, r6		!  79 EX
	bf/s	1b		! 109 BR

	 mov.b	r1,@-r0		!  28 LS

2:	add	#1, r5		!  79 EX

	! Now select the appropriate bulk transfer code based on relative
	! alignment of src and dst.

	mov	r0, r3		!   5 MT (latency=0)

	mov	r5, r0		!   5 MT (latency=0)
	tst	#1, r0		!  87 MT

	bf/s	1f		! 111 BR
	 mov	#64, r7		!   6 EX

	! bit 0 clear

	cmp/ge	r7, r6		!  55 MT

	bt/s	2f		! 111 BR
	 tst	#2, r0		!  87 MT

	! small
	bt/s	.Lcase0
	 mov	r3, r0

	bra	.Lcase2
	 nop

	! big
2:	bt/s	.Lcase0b
	 mov	r3, r0

	bra	.Lcase2b
	 nop

	! bit 0 set
1:	tst	#2, r0		! 87 MT

	bt/s	.Lcase1
	 mov	r3, r0

	bra	.Lcase3
	 nop


	!
	!	GHIJ KLMN OPQR -->  GHIJ KLMN OPQR
	!

	! src, dst and size are all long word aligned
	! size is non-zero

	.balign	32
.Lcase00:
	mov	#64, r1		!   6 EX
	mov	r5, r3		!   5 MT (latency=0)

	cmp/gt	r6, r1		!  56 MT
	add	#-4, r5		!  50 EX

	bf	.Lcase00b	! 108 BR		(big loop)
	shlr2	r6		! 105 EX

	shlr	r6		! 104 EX
	mov.l	@(r0, r5), r1	!  21 LS (latency=2)

	bf/s	4f		! 111 BR
	 add	#-8, r3		!  50 EX

	tst	r6, r6		!  86 MT
	bt/s	5f		! 110 BR

	 mov.l	r1,@-r0		!  30 LS

	! 4 cycles, 2 long words per iteration
3:	mov.l	@(r0, r5), r1	!  21 LS (latency=2)

4:	mov.l	@(r0, r3), r2	!  21 LS (latency=2)
	dt	r6		!  67 EX

	mov.l	r1, @-r0	!  30 LS
	bf/s	3b		! 109 BR

	 mov.l	r2, @-r0	!  30 LS

5:	rts
	 nop


	! Size is 16 or greater and less than 64, but may have trailing bytes

	.balign	32
.Lcase0:
	add	#-4, r5		!  50 EX
	mov	r4, r7		!   5 MT (latency=0)

	mov.l	@(r0, r5), r1	!  21 LS (latency=2)
	mov	#4, r2		!   6 EX

	add	#11, r7		!  50 EX
	tst	r2, r6		!  86 MT

	mov	r5, r3		!   5 MT (latency=0)
	bt/s	4f		! 111 BR

	 add	#-4, r3		!  50 EX
	mov.l	r1,@-r0		!  30 LS

	! 4 cycles, 2 long words per iteration
3:	mov.l	@(r0, r5), r1	!  21 LS (latency=2)

4:	mov.l	@(r0, r3), r2	!  21 LS (latency=2)
	cmp/hi	r7, r0

	mov.l	r1, @-r0	!  30 LS
	bt/s	3b		! 109 BR

	 mov.l	r2, @-r0	!  30 LS

	! Copy the final 0-3 bytes

	add	#3,r5		!  50 EX

	cmp/eq	r0, r4		!  54 MT
	add	#-10, r7	!  50 EX

	bt	9f		! 110 BR

	! 3 cycles, 1 byte per iteration
1:	mov.b	@(r0,r5),r1	!  19 LS
	cmp/hi	r7,r0		!  57 MT

	bt/s	1b		! 111 BR
	 mov.b	r1,@-r0		!  28 LS

9:	rts
	 nop

	! Size is at least 64 bytes, so will be going round the big loop at least once.
	!
	!   r2 = rounded up r4
	!   r3 = rounded down r0

	.balign	32
.Lcase0b:
	add	#-4, r5		!  50 EX

.Lcase00b:
	mov	r0, r3		!   5 MT (latency=0)
	mov	#(~0x1f), r1	!   6 EX

	and	r1, r3		!  78 EX
	mov	r4, r2		!   5 MT (latency=0)

	cmp/eq	r3, r0		!  54 MT
	add	#0x1f, r2	!  50 EX

	bt/s	1f		! 110 BR
	 and	r1, r2		!  78 EX

	! copy initial words until cache line aligned

	mov.l	@(r0, r5), r1	!  21 LS (latency=2)
	tst	#4, r0		!  87 MT

	mov	r5, r6		!   5 MT (latency=0)
	add	#-4, r6		!  50 EX

	bt/s	4f		! 111 BR
	 add	#8, r3		!  50 EX

	tst	#0x18, r0	!  87 MT

	bt/s	1f		! 109 BR
	 mov.l	r1,@-r0		!  30 LS

	! 4 cycles, 2 long words per iteration
3:	mov.l	@(r0, r5), r1	!  21 LS (latency=2)

4:	mov.l	@(r0, r6), r7	!  21 LS (latency=2)
	cmp/eq	r3, r0		!  54 MT

	mov.l	r1, @-r0	!  30 LS
	bf/s	3b		! 109 BR

	 mov.l	r7, @-r0	!  30 LS

	! Copy the cache line aligned blocks
	!
	! In use: r0, r2, r4, r5
	! Scratch: r1, r3, r6, r7
	!
	! We could do this with the four scratch registers, but if src
	! and dest hit the same cache line, this will thrash, so make
	! use of additional registers.
	!
	! We also need r0 as a temporary (for movca), so 'undo' the invariant:
	!   r5:	 src (was r0+r5)
	!   r1:	 dest (was r0)
	! this can be reversed at the end, so we don't need to save any extra
	! state.
	!
1:	mov.l	r8, @-r15	!  30 LS
	add	r0, r5		!  49 EX

	mov.l	r9, @-r15	!  30 LS
	mov	r0, r1		!   5 MT (latency=0)

	mov.l	r10, @-r15	!  30 LS
	add	#-0x1c, r5	!  50 EX

	mov.l	r11, @-r15	!  30 LS

	! 16 cycles, 32 bytes per iteration
2:	mov.l	@(0x00,r5),r0	! 18 LS (latency=2)
	add	#-0x20, r1	! 50 EX
	mov.l	@(0x04,r5),r3	! 18 LS (latency=2)
	mov.l	@(0x08,r5),r6	! 18 LS (latency=2)
	mov.l	@(0x0c,r5),r7	! 18 LS (latency=2)
	mov.l	@(0x10,r5),r8	! 18 LS (latency=2)
	mov.l	@(0x14,r5),r9	! 18 LS (latency=2)
	mov.l	@(0x18,r5),r10	! 18 LS (latency=2)
	mov.l	@(0x1c,r5),r11	! 18 LS (latency=2)
	movca.l	r0,@r1		! 40 LS (latency=3-7)
	mov.l	r3,@(0x04,r1)	! 33 LS
	mov.l	r6,@(0x08,r1)	! 33 LS
	mov.l	r7,@(0x0c,r1)	! 33 LS

	mov.l	r8,@(0x10,r1)	! 33 LS
	add	#-0x20, r5	! 50 EX

	mov.l	r9,@(0x14,r1)	! 33 LS
	cmp/eq	r2,r1		! 54 MT

	mov.l	r10,@(0x18,r1)	!  33 LS
	bf/s	2b		! 109 BR

	 mov.l	r11,@(0x1c,r1)	!  33 LS

	mov	r1, r0		!   5 MT (latency=0)

	mov.l	@r15+, r11	!  15 LS
	sub	r1, r5		!  75 EX

	mov.l	@r15+, r10	!  15 LS
	cmp/eq	r4, r0		!  54 MT

	bf/s	1f		! 109 BR
	 mov.l	 @r15+, r9	!  15 LS

	rts
1:	 mov.l	@r15+, r8	!  15 LS
	sub	r4, r1		!  75 EX		(len remaining)

	! number of trailing bytes is non-zero
	!
	! invariants restored (r5 already decremented by 4)
	! also r1=num bytes remaining

	mov	#4, r2		!   6 EX
	mov	r4, r7		!   5 MT (latency=0)

	add	#0x1c, r5	!  50 EX		(back to -4)
	cmp/hs	r2, r1		!  58 MT

	bf/s	5f		! 108 BR
	 add	 #11, r7	!  50 EX

	mov.l	@(r0, r5), r6	!  21 LS (latency=2)
	tst	r2, r1		!  86 MT

	mov	r5, r3		!   5 MT (latency=0)
	bt/s	4f		! 111 BR

	 add	#-4, r3		!  50 EX
	cmp/hs	r2, r1		!  58 MT

	bt/s	5f		! 111 BR
	 mov.l	r6,@-r0		!  30 LS

	! 4 cycles, 2 long words per iteration
3:	mov.l	@(r0, r5), r6	!  21 LS (latency=2)

4:	mov.l	@(r0, r3), r2	!  21 LS (latency=2)
	cmp/hi	r7, r0

	mov.l	r6, @-r0	!  30 LS
	bt/s	3b		! 109 BR

	 mov.l	r2, @-r0	!  30 LS

	! Copy the final 0-3 bytes

5:	cmp/eq	r0, r4		!  54 MT
	add	#-10, r7	!  50 EX

	bt	9f		! 110 BR
	add	#3,r5		!  50 EX

	! 3 cycles, 1 byte per iteration
1:	mov.b	@(r0,r5),r1	!  19 LS
	cmp/hi	r7,r0		!  57 MT

	bt/s	1b		! 111 BR
	 mov.b	r1,@-r0		!  28 LS

9:	rts
	 nop

	!
	!	GHIJ KLMN OPQR -->  ..GH IJKL MNOP QR..
	!

	.balign	32
.Lcase2:
	! Size is 16 or greater and less then 64, but may have trailing bytes

2:	mov	r5, r6		!   5 MT (latency=0)
	add	#-2,r5		!  50 EX

	mov	r4,r2		!   5 MT (latency=0)
	add	#-4,r6		!  50 EX

	add	#7,r2		!  50 EX
3:	mov.w	@(r0,r5),r1	!  20 LS (latency=2)

	mov.w	@(r0,r6),r3	!  20 LS (latency=2)
	cmp/hi	r2,r0		!  57 MT

	mov.w	r1,@-r0		!  29 LS
	bt/s	3b		! 111 BR

	 mov.w	r3,@-r0		!  29 LS

	bra	10f
	 nop


	.balign	32
.Lcase2b:
	! Size is at least 64 bytes, so will be going round the big loop at least once.
	!
	!   r2 = rounded up r4
	!   r3 = rounded down r0

	mov	r0, r3		!   5 MT (latency=0)
	mov	#(~0x1f), r1	!   6 EX

	and	r1, r3		!  78 EX
	mov	r4, r2		!   5 MT (latency=0)

	cmp/eq	r3, r0		!  54 MT
	add	#0x1f, r2	!  50 EX

	add	#-2, r5		!  50 EX
	bt/s	1f		! 110 BR
	 and	r1, r2		!  78 EX

	! Copy a short word one at a time until we are cache line aligned
	!   Normal values: r0, r2, r3, r4
	!   Unused: r1, r6, r7
	!   Mod: r5 (=r5-2)
	!
	add	#2, r3		!  50 EX

2:	mov.w	@(r0,r5),r1	!  20 LS (latency=2)
	cmp/eq	r3,r0		!  54 MT

	bf/s	2b		! 111 BR

	 mov.w	r1,@-r0		!  29 LS

	! Copy the cache line aligned blocks
	!
	! In use: r0, r2, r4, r5 (=r5-2)
	! Scratch: r1, r3, r6, r7
	!
	! We could do this with the four scratch registers, but if src
	! and dest hit the same cache line, this will thrash, so make
	! use of additional registers.
	!
	! We also need r0 as a temporary (for movca), so 'undo' the invariant:
	!   r5:	 src (was r0+r5)
	!   r1:	 dest (was r0)
	! this can be reversed at the end, so we don't need to save any extra
	! state.
	!
1:	mov.l	r8, @-r15	!  30 LS
	add	r0, r5		!  49 EX

	mov.l	r9, @-r15	!  30 LS
	mov	r0, r1		!   5 MT (latency=0)

	mov.l	r10, @-r15	!  30 LS
	add	#-0x1e, r5	!  50 EX

	mov.l	r11, @-r15	!  30 LS

	mov.l	r12, @-r15	!  30 LS

	! 17 cycles, 32 bytes per iteration
#ifdef CONFIG_CPU_LITTLE_ENDIAN
2:	mov.w	@r5+, r0	!  14 LS (latency=2)		..JI
	add	#-0x20, r1	!  50 EX

	mov.l	@r5+, r3	!  15 LS (latency=2)		NMLK

	mov.l	@r5+, r6	!  15 LS (latency=2)		RQPO
	shll16	r0		! 103 EX			JI..

	mov.l	@r5+, r7	!  15 LS (latency=2)
	xtrct	r3, r0		!  48 EX			LKJI

	mov.l	@r5+, r8	!  15 LS (latency=2)
	xtrct	r6, r3		!  48 EX			PONM

	mov.l	@r5+, r9	!  15 LS (latency=2)
	xtrct	r7, r6		!  48 EX

	mov.l	@r5+, r10	!  15 LS (latency=2)
	xtrct	r8, r7		!  48 EX

	mov.l	@r5+, r11	!  15 LS (latency=2)
	xtrct	r9, r8		!  48 EX

	mov.w	@r5+, r12	!  15 LS (latency=2)
	xtrct	r10, r9		!  48 EX

	movca.l	r0,@r1		!  40 LS (latency=3-7)
	xtrct	r11, r10	!  48 EX

	mov.l	r3, @(0x04,r1)	!  33 LS
	xtrct	r12, r11	!  48 EX

	mov.l	r6, @(0x08,r1)	!  33 LS

	mov.l	r7, @(0x0c,r1)	!  33 LS

	mov.l	r8, @(0x10,r1)	!  33 LS
	add	#-0x40, r5	!  50 EX

	mov.l	r9, @(0x14,r1)	!  33 LS
	cmp/eq	r2,r1		!  54 MT

	mov.l	r10, @(0x18,r1)	!  33 LS
	bf/s	2b		! 109 BR

	 mov.l	r11, @(0x1c,r1)	!  33 LS
#else
2:	mov.w	@(0x1e,r5), r0	!  17 LS (latency=2)
	add	#-2, r5		!  50 EX

	mov.l	@(0x1c,r5), r3	!  18 LS (latency=2)
	add	#-4, r1		!  50 EX

	mov.l	@(0x18,r5), r6	!  18 LS (latency=2)
	shll16	r0		! 103 EX

	mov.l	@(0x14,r5), r7	!  18 LS (latency=2)
	xtrct	r3, r0		!  48 EX

	mov.l	@(0x10,r5), r8	!  18 LS (latency=2)
	xtrct	r6, r3		!  48 EX

	mov.l	@(0x0c,r5), r9	!  18 LS (latency=2)
	xtrct	r7, r6		!  48 EX

	mov.l	@(0x08,r5), r10	!  18 LS (latency=2)
	xtrct	r8, r7		!  48 EX

	mov.l	@(0x04,r5), r11	!  18 LS (latency=2)
	xtrct	r9, r8		!  48 EX

	mov.w	@(0x02,r5), r12	!  18 LS (latency=2)
	xtrct	r10, r9		!  48 EX

	movca.l	r0,@r1		!  40 LS (latency=3-7)
	add	#-0x1c, r1	!  50 EX

	mov.l	r3, @(0x1c,r1)	!  33 LS
	xtrct	r11, r10	!  48 EX

	mov.l	r6, @(0x18,r1)	!  33 LS
	xtrct	r12, r11	!  48 EX

	mov.l	r7, @(0x14,r1)	!  33 LS

	mov.l	r8, @(0x10,r1)	!  33 LS
	add	#-0x3e, r5	!  50 EX

	mov.l	r9, @(0x0c,r1)	!  33 LS
	cmp/eq	r2,r1		!  54 MT

	mov.l	r10, @(0x08,r1)	!  33 LS
	bf/s	2b		! 109 BR

	 mov.l	r11, @(0x04,r1)	!  33 LS
#endif

	mov.l	@r15+, r12
	mov	r1, r0		!   5 MT (latency=0)

	mov.l	@r15+, r11	!  15 LS
	sub	r1, r5		!  75 EX

	mov.l	@r15+, r10	!  15 LS
	cmp/eq	r4, r0		!  54 MT

	bf/s	1f		! 109 BR
	 mov.l	 @r15+, r9	!  15 LS

	rts
1:	 mov.l	@r15+, r8	!  15 LS

	add	#0x1e, r5	!  50 EX

	! Finish off a short word at a time
	! r5 must be invariant - 2
10:	mov	r4,r2		!   5 MT (latency=0)
	add	#1,r2		!  50 EX

	cmp/hi	r2, r0		!  57 MT
	bf/s	1f		! 109 BR

	 add	#2, r2		!  50 EX

3:	mov.w	@(r0,r5),r1	!  20 LS
	cmp/hi	r2,r0		!  57 MT

	bt/s	3b		! 109 BR

	 mov.w	r1,@-r0		!  29 LS
1:

	!
	! Finally, copy the last byte if necessary
	cmp/eq	r4,r0		!  54 MT
	bt/s	9b
	 add	#1,r5
	mov.b	@(r0,r5),r1
	rts
	 mov.b	r1,@-r0