summaryrefslogtreecommitdiffstats
path: root/apps/recorder/jpeg_idct_arm.S
blob: 4739600a81ee7d212ca250f0fc10552a89bd6c6d (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
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
/***************************************************************************
*             __________               __   ___.
*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
*                     \/            \/     \/    \/            \/
* $Id$
*
* JPEG assembly IDCT
*
* Copyright (C) 2009 Andrew Mahone asm versions of the C IDCT algorithms used
*                                  jpeg_load.c with 
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "apps/core_asmdefs.h"

    .section .text
    .align   2
    .global jpeg_idct1h
    .type   jpeg_idct1h, %function
    .global jpeg_idct2v
    .type   jpeg_idct2v, %function
    .global jpeg_idct2h
    .type   jpeg_idct2h, %function
    .global jpeg_idct4v
    .type   jpeg_idct4v, %function
    .global jpeg_idct4h
    .type   jpeg_idct4h, %function
    .global jpeg_idct8v
    .type   jpeg_idct8v, %function
    .global jpeg_idct8h
    .type   jpeg_idct8h, %function

jpeg_idct1h:
/* In the common case of one pass through the loop, the extra add should be
   cheaper than saving registers to stack and loading a the value 4112. */
1:
    ldrsh  r12, [r0]
    add    r12, r12, #4096
    add    r12, r12, #16
#if ARM_ARCH < 6
    mov    r12, r12, asr #5
    cmp    r12, #255
    mvnhi  r12, r12, asr #31
#else
    usat   r12, #8,  r12, asr #5
#endif
    strb   r12, [r1]
    add    r0,  r0,  #16
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    bx     lr
    .size jpeg_idct1h, .-jpeg_idct1h

jpeg_idct2v:
#if ARM_ARCH < 6
/* Use SWAR tricks to fake partitioned add and subtract. This is slightly faster
   than loading two values in each register and using shifts and strh, and
   requires fewer fixup operations than splitting the values, calculating, and
   merging.
*/
    stmdb  sp!, { r4, lr }
1:
    ldr    r2,  [r0]
    ldr    r3,  [r0, #16]
    eor    r12, r2,  r3
    and    r12, r12, #0x8000
    bic    r3,  r3,  #0x8000
    bic    r4,  r2,  #0x8000
    add    r4,  r4,  r3
    eor    r4,  r4,  r12
    orr    r2,  r2,  #0x8000
    sub    r2,  r2,  r3
    eor    r2,  r2,  r12
    eor    r2,  r2,  #0x8000
    str    r4,  [r0]
    str    r2,  [r0, #16]
    add    r0,  r0,  #4
    cmp    r0,  r1
    bcc    1b
    ldmia  sp!, { r4, pc }
#else
/* ARMv6 offers partitioned adds and subtracts, used here to unroll the loop
   to two columns.
*/
1:
    ldr    r2,  [r0]
    ldr    r3,  [r0, #16]
    sadd16 r12, r2,  r3
    ssub16 r2,  r2,  r3
    str    r12, [r0]
    str    r2,  [r0, #16]
    add    r0,  r0,  #4
    cmp    r0,  r1
    bcc    1b
    bx     lr
#endif
    .size jpeg_idct2v, .-jpeg_idct2v

jpeg_idct2h:
#if ARM_ARCH < 6
/* Using LDR and shifts here would costs two more ops, and is no faster as
   results can not be stored merged.
*/
    stmdb  sp!, { r4-r5, lr }
#if ARM_ARCH < 5
    ldr    r14, =4112
#else
    ldrsh  r14, .Lpool4+2
#endif
1:
    ldrsh  r12, [r0]
    ldrsh  r4,  [r0, #2]
    add    r12, r12, r14
    add    r5,  r12, r4
    sub    r4,  r12, r4
    mov    r5,  r5,  asr #5
    mov    r4,  r4,  asr #5
    cmp    r5,  #255
    mvnhi  r5,  r5,  asr #31
    cmp    r4,  #255
    mvnhi  r4,  r4,  asr #31
    strb   r5,  [r1]
    strb   r4,  [r1, #pix8_size]
    add    r0,  r0,  #16
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia  sp!, { r4-r5, pc }
#else
    stmdb  sp!, { r4, lr }
    ldrsh  r14, .Lpool4+2
1:
    ldr    r12, [r0]
    sadd16 r12, r12, r14
    saddsubx    r12, r12, r12
    usat   r4,  #8,  r12, asr #21
    sxth   r12, r12
    usat   r12, #8,  r12, asr #5
    strb   r4,  [r1]
    strb   r12, [r1, #pix8_size]
    add    r0,  r0,  #16
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia  sp!, { r4, pc }
#endif
    .size jpeg_idct2h, .-jpeg_idct2h

jpeg_idct4v:
#if ARM_ARCH < 5
    stmdb  sp!, { r4-r7, lr }
    ldr    r14, =-15137
    ldr    r12, =6270
1:
    ldrsh  r4,  [r0, #32]
    ldrsh  r2,  [r0]
    ldrsh  r5,  [r0, #48]
    ldrsh  r3,  [r0, #16]
    add    r6,  r2,  r4            /* r6 = tmp10 >> 2 = d0 + d2 */
    sub    r2,  r2,  r4            /* r2 = tmp12 >> 2= d0 - d2 */
    add    r4,  r3,  r5            /* r4 = z1 = d1 + d3 */
    add    r7,  r4,  r4,  lsl #3
    rsb    r4,  r4,  r7,  lsl #4
    rsb    r4,  r4,  r4,  lsl #5   /* z1 *= 4433 */
    add    r4,  r4,  #1024
    mla    r3,  r12, r3,  r4       /* r3 = tmp2 = z1 + z2 * 6270 */ 
    mla    r5,  r14, r5,  r4       /* r5 = tmp0 = z1 - z3 * 15137 */
    mov    r6,  r6,  lsl #2        /* r6 <<= 2 */
    mov    r2,  r2,  lsl #2        /* r2 <<= 2 */
    add    r7,  r6,  r3,  asr #11   /* r7 = o0 */
    sub    r3,  r6,  r3,  asr #11   /* r3 = o3 */
    add    r6,  r2,  r5,  asr #11   /* r6 = o1 */
    sub    r2,  r2,  r5,  asr #11   /* r2 = o2 */
    strh   r7,  [r0]
    strh   r3,  [r0, #48]
    strh   r6,  [r0, #16]
    strh   r2,  [r0, #32]
    add    r0,  r0,  #2
    cmp    r0,  r1
    bcc    1b
    ldmia  sp!, { r4-r7, pc }
#elif ARM_ARCH < 6
    stmdb sp!, { r4-r8, lr }
    mov    r8,  #1024
    ldr    r4,  .Lpool4
    ldr    r5,  .Lpool4+4
1:
    ldrsh  r14, [r0, #48]
    ldrsh  r3,  [r0, #16]
    ldrsh  r12, [r0, #32]
    ldrsh  r2,  [r0]
    add    r6,  r3,  r14           /* r6  = z1 = d1 + d3 */
    add    r7,  r2,  r12           /* r7  = tmp10 >> 2 = d0 + d2 */
    smlabb r6,  r5,  r6,  r8       /* z1 *= 4433 */
    sub    r2,  r2,  r12           /* r2  = tmp12 >> 2= d0 - d2 */
    smlatb r3,  r5,  r3,  r6       /* r3  = tmp2 = z1 + z2 * 6270 */ 
    smlabb r14, r4,  r14, r6       /* r14 = tmp0 = z1 - z3 * 15137 */
    mov    r7,  r7,  lsl #2
    mov    r2,  r2,  lsl #2
    add    r12, r7,  r3,  asr #11   /* r12 = o0 */
    sub    r7,  r7,  r3,  asr #11   /* r7  = o3 */
    add    r3,  r2,  r14, asr #11   /* r3  = o1 */
    sub    r2,  r2,  r14, asr #11   /* r2  = o2 */
    strh   r12, [r0]
    strh   r7,  [r0, #48]
    strh   r3,  [r0, #16]
    strh   r2,  [r0, #32]
    add    r0,  r0,  #2
    cmp    r0,  r1
    bcc    1b
    ldmia sp!, { r4-r8, pc }
#else
    stmdb  sp!, { r4-r10, lr }
    ldrd   r2,  .Lpool4
    mov    r12, #1024
1:
    ldr    r6,  [r0, #32]
    ldr    r4,  [r0]
    ldr    r7,  [r0, #48]
    ldr    r5,  [r0, #16]
    /* this part is being done in parallel on two columns */
    sadd16 r8,  r4,  r6            /* r8 = d0 + d2 */
    ssub16 r4,  r4,  r6            /* r4 = d0 - d2 */
    sadd16 r6,  r5,  r7            /* r6 = d1 + d3 */
    /* there is no parallel shift operation, but we can fake it with bic
       and lsl */
    bic    r8,  r8,  #0xc000
    bic    r4,  r4,  #0xc000
    /* multiplication expands values beyond 16 bits, so this part needs to be
       split. the values will be merged below so that the rest of the addition
       can be done in parallel */
    smlabb r9,  r3,  r6,  r12      /* r9 = z1[0] = (d1 * d3) * 4433 + 1024 */
    smlabt r6,  r3,  r6,  r12      /* r6 = z1[1] = (d1 * d3) * 4433 + 1024 */
    smlatb r10, r3,  r5,  r9       /* r10 = tmp2[0] = z1 + d1 * 6270 */
    smlabb r14, r2,  r7,  r9       /* r14 = tmp0[0] = z1 - d3 * 15137 */
    smlatt r5,  r3,  r5,  r6       /* r5  = tmp2[1] */
    smlabt r6,  r2,  r7,  r6       /* r6  = tmp0[1] */
    mov    r8,  r8,  lsl #2        /* complete the parallel shift started */
    mov    r4,  r4,  lsl #2        /* with the earlier bic instructions */
    /* tmp2 are in r10, r5; tmp0 are in r14, r6 */
    /* tmp10, tmp12 are in r4, r8 */
    mov    r10, r10, asr #11
    mov    r14, r14, asr #11
    pkhbt  r5,  r10, r5,  lsl #5 /* parallel tmp2 */ 
    pkhbt  r6,  r14, r6,  lsl #5 /* parallel tmp0 */
    sadd16 r10, r8,  r5 /* d0 */
    ssub16 r5,  r8,  r5 /* d3 */
    sadd16 r14, r4,  r6 /* d1 */
    ssub16 r6,  r4,  r6 /* d2 */
    str    r10, [r0]
    str    r5,  [r0, #48]
    str    r14, [r0, #16]
    str    r6,  [r0, #32]
    add    r0,  r0,  #4
    cmp    r0,  r1
    bcc    1b
    ldmia  sp!, { r4-r10, pc }
#endif
    .size jpeg_idct4v, .-jpeg_idct4v

#if ARM_ARCH > 4
    .align 4
.Lpool4:
    .short -15137
    .short 4112
    .short 4433
    .short 6270

    .align 2
#endif

jpeg_idct4h:
#if ARM_ARCH < 5
    stmdb  sp!, { r4-r10, lr }
    ldr    r10, =-15137
    ldr    r14, =4112
    ldr    r12, =6270
1:
    ldrsh  r4,  [r0]
    ldrsh  r6,  [r0, #4]
    ldrsh  r7,  [r0, #6]
    ldrsh  r5,  [r0, #2]
    add    r4,  r4,  r14
    add    r8,  r4,  r6            /* r8 = tmp10 >> 2 = d0 + d2 */
    sub    r4,  r4,  r6            /* r4 = tmp12 >> 2= d0 - d2 */
    add    r6,  r5,  r7            /* r6 = z1 = d1 + d3 */
    add    r9,  r6,  r6,  lsl #3
    rsb    r6,  r6,  r9,  lsl #4
    rsb    r6,  r6,  r6,  lsl #5   /* z1 *= 4433 */
    mla    r7,  r10, r7,  r6       /* r5 = tmp0 = z1 - z3 * 15137 */
    mla    r5,  r12, r5,  r6       /* r3 = tmp2 = z1 + z2 * 6270 */ 
    add    r9,  r5,  r8,  lsl #13  /* r7 = o0 */
    rsb    r5,  r5,  r8,  lsl #13  /* r3 = o3 */
    add    r8,  r7,  r4,  lsl #13  /* r6 = o1 */
    rsb    r4,  r7,  r4,  lsl #13  /* r2 = o2 */
    mov    r9,  r9,  asr #18
    mov    r8,  r8,  asr #18
    mov    r4,  r4,  asr #18
    mov    r5,  r5,  asr #18
    cmp    r9,  #255
    mvnhi  r9,  r9,  asr #31
    cmp    r8,  #255
    mvnhi  r8,  r8,  asr #31
    cmp    r4,  #255
    mvnhi  r4,  r4,  asr #31
    cmp    r5,  #255
    mvnhi  r5,  r5,  asr #31
    strb   r9,  [r1]
    strb   r8,  [r1, #pix8_size]
    strb   r4,  [r1, #2*pix8_size]
    strb   r5,  [r1, #3*pix8_size]
    add    r0,  r0,  #16
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia sp!, { r4-r10, pc }
#elif ARM_ARCH < 6
    stmdb  sp!, { r4-r9, lr }
    ldr    r4,  .Lpool4
    ldr    r5,  .Lpool4+4
1:
    ldrsh  r7,  [r0, #6]
    ldrsh  r14, [r0, #2]
    ldrsh  r12, [r0]
    ldrsh  r6,  [r0, #4]
    add    r8,  r14, r7             /* r8 = z1 = d1 + d3 */
    add    r12, r12, r4,  lsr #16
    smulbb r8,  r5,  r8             /* z1 *= 4433 */
    add    r9,  r12, r6             /* r9 = tmp10 >> 13 = d0 + d2 */
    smlatb r14, r5,  r14, r8        /* r14= tmp2 = z1 + z2 * 6270 */ 
    smlabb r7,  r4,  r7,  r8        /* r7 = tmp0 = z1 - z3 * 15137 */
    sub    r12, r12, r6             /* r12= tmp12 >> 13 = d0 - d2 */
    add    r6,  r14, r9,  lsl #13   /* r6 = o0 */
    rsb    r9,  r14, r9,  lsl #13   /* r9 = o3 */
    add    r14, r7,  r12, lsl #13   /* r14= o1 */
    rsb    r12, r7,  r12, lsl #13   /* r12= o2 */
    mov    r6,  r6,  asr #18
    mov    r14, r14, asr #18
    mov    r12, r12, asr #18
    mov    r9,  r9,  asr #18
    cmp    r6,  #255
    mvnhi  r6,  r6,  asr #31
    cmp    r14, #255
    mvnhi  r14, r14, asr #31
    cmp    r12, #255
    mvnhi  r12, r12, asr #31
    cmp    r9,  #255
    mvnhi  r9,  r9,  asr #31
    strb   r6,  [r1]
    strb   r14, [r1, #pix8_size]
    strb   r12, [r1, #2*pix8_size]
    strb   r9,  [r1, #3*pix8_size]
    add    r0,  r0,  #16
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia sp!, { r4-r9, pc }
#else
    stmdb sp!, { r4-r9, lr }
    ldrd   r4,  .Lpool4
    mov    r9,  r4,  lsr #16
1:
    ldmia  r0,  { r12, r14 }
    sadd16 r12, r12, r9
    sadd16 r6,  r12, r14            /* r6lo = d0 + d2, r6hi = d1 + d3 */
    ssub16 r7,  r12, r14            /* r7lo = d0 - d2 */
    smulbt r8,  r5,  r6
    sxth   r6,  r6
    smlatt r12, r5,  r12, r8        /* r12= tmp2 = z1 + z2 * 6270 */
    smlabt r14, r4,  r14, r8        /* r14= tmp0 = z1 - z3 * 15137 */
    sxth   r7,  r7
    add    r8,  r12, r6,  lsl #13   /* r8 = o0 */
    rsb    r6,  r12, r6,  lsl #13   /* r6 = o3 */
    add    r12, r14, r7,  lsl #13   /* r12= o1 */
    rsb    r14, r14, r7,  lsl #13   /* r14= o2 */
    usat  r8,  #8,  r8,  asr #18
    usat  r6,  #8,  r6,  asr #18
    usat  r12, #8,  r12, asr #18
    usat  r14, #8,  r14, asr #18
    strb   r8,  [r1]
    strb   r6,  [r1, #3*pix8_size]
    strb   r12, [r1, #pix8_size]
    strb   r14, [r1, #2*pix8_size]
    add   r0,  r0,  #16
    add   r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia sp!, { r4-r9, pc }
#endif
    .size jpeg_idct4h, .-jpeg_idct4h

#if ARM_ARCH < 6
jpeg_idct8v:
    stmdb  sp!, { r4-r11, lr }
    add    r2,  r0,  #128
1:
    ldmia  r0!, { r4-r7 }
#if ARM_ARCH < 5
    mov    r8,  r4,  lsl #16
    orrs   r9,  r6,  r7
    orreqs r9,  r5,  r4, lsr #16
    bne    2f
    mov    r8,  r8,  asr #14
    strh   r8,  [r2]
    strh   r8,  [r2, #16]
    strh   r8,  [r2, #32]
    strh   r8,  [r2, #48]
    strh   r8,  [r2, #64]
    strh   r8,  [r2, #80]
    strh   r8,  [r2, #96]
    strh   r8,  [r2, #112]
    cmp    r0,  r1
    add    r2,  r2,  #2
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
2:
    ldr    r14, =4433
    ldr    r12, =-15137
    mov    r10, r5,  lsl #16
    mov    r11, r7,  lsl #16
    mov    r10, r10, asr #16        /* r10 = z2 = d2 */
    mov    r11, r11, asr #16        /* r11 = z3 = d6 */
    add    r8,  r8,  #8192
    add    r9,  r10, r11
    mov    r8,  r8,  asr #3         /* r8  = z4 = (d0 << 13) + 1024 */
    mul    r9,  r14, r9             /* r9  = z1 = (z2 + z3) * 4433 */
    ldr    r14, =6270
    mla    r11, r12, r11, r9         /* r11 = tmp2 = z1 - z3 * 15137 */
    mla    r10, r14, r10, r9         /* r10 = tmp3 = z1 + z2 * 6270 */
    mov    r9,  r6,  lsl #16         /* r9  = z5 << 3 = d4 << 16 */
    add    r12, r8,  r9,  asr #3     /* r12 = tmp0 = z4 + z5 */
    sub    r14, r8,  r9,  asr #3     /* r14 = tmp1 = z4 - z5 */
    add    r8,  r12, r10             /* r8  = tmp10 = tmp0 + tmp3 */
    sub    r9,  r12, r10             /* r9  = tmp13 = tmp0 - tmp3 */
    add    r10, r14, r11             /* r10 = tmp11 = tmp1 + tmp2 */
    sub    r11, r14, r11             /* r11 = tmp12 = tmp1 - tmp2 */
    stmdb  sp,  { r8-r11 }           /* tmp10 tmp13 tmp11 tmp12 */
    mov    r4,  r4,  asr #16         /* r4  = tmp3 = d1 */
    mov    r5,  r5,  asr #16         /* r5  = tmp2 = d3 */
    mov    r6,  r6,  asr #16         /* r6  = tmp1 = d5 */
    mov    r7,  r7,  asr #16         /* r7  = tmp0 = d7 */
    ldr    r10, =9633
    ldr    r11, =-16069
    add    r12, r5,  r7              /* r12 = z3 = tmp0 + tmp2 */
    add    r14, r4,  r6              /* r14 = z4 = tmp1 + tmp3 */
    add    r9,  r12, r14             /* r9  = z3 + z4 */
    mul    r9,  r10, r9              /* r9  = z5 = (z3 + z4) * 9633 */
    ldr    r10, =-3196
    mla    r12, r11, r12, r9         /* r12 = z3 = z5 - z3 * 16069 */
    ldr    r11, =-7373
    mla    r14, r10, r14, r9         /* r14 = z4 = z5 - z4 * 3196 */
    ldr    r10, =2446
    add    r9,  r4,  r7              /* r9  = tmp0 + tmp3 */
    mla    r8,  r11, r9,  r12        /* r8  = z1 + z3 */
    mla    r9,  r11, r9,  r14        /* r9  = z1 + z4 */
    ldr    r11, =12299
    mla    r7,  r10, r7,  r8         /* r7  = tmp0 = z1 + z3 + tmp0 * 2446 */
    ldr    r10, =-20995
    mla    r4,  r11, r4,  r9         /* r4  = tmp3 = z1 + z4 + tmp0 * 12299 */
    ldr    r11, =25172
    add    r9,  r5,  r6              /* r9  = tmp1 + tmp2 */
    mla    r12, r10, r9, r12         /* r12 = z2 + z3 */
    mla    r14, r10, r9, r14         /* r14 = z2 + z4 */
    ldr    r10, =16819
    mla    r5,  r11, r5, r12         /* r5  = tmp2 = z2 + z3 + tmp2 * 25172 */
    mla    r6,  r10, r6, r14         /* r6  = tmp1 = z2 + z4 + tmp1 * 16819 */
    ldmdb  sp,  { r8-r11 }
    add    r12, r8,  r4              /* o0 */
    sub    r14, r8,  r4              /* o7 */
    add    r8,  r9,  r7              /* o3 */
    sub    r9,  r9,  r7              /* o4 */
    add    r4,  r10, r5              /* O1 */
    sub    r5,  r10, r5              /* o6 */
    add    r10, r11, r6              /* o2 */
    sub    r11, r11, r6              /* o5 */
    /* output in order: r12 r4  r10 r8  r9  r11 r5  r14 */
    mov    r12, r12, asr #11
    mov    r4,  r4,  asr #11
    mov    r10, r10, asr #11
    mov    r8,  r8,  asr #11
    mov    r9,  r9,  asr #11
    mov    r11, r11, asr #11
    mov    r5,  r5,  asr #11
    mov    r14, r14, asr #11
    strh   r12, [r2]
    strh   r4,  [r2, #16]
    strh   r10, [r2, #32]
    strh   r8,  [r2, #48]
    strh   r9,  [r2, #64]
    strh   r11, [r2, #80]
    strh   r5,  [r2, #96]
    strh   r14, [r2, #112]
#else /* ARMv5+ */
    mov    r12, r4,  lsl #16
    orrs   r9,  r6,  r7
    orreqs r9,  r5,  r4,  lsr #16
    bne    2f
    mov    r12, r12, asr #14
    strh   r12, [r2]
    strh   r12, [r2, #16]
    strh   r12, [r2, #32]
    strh   r12, [r2, #48]
    strh   r12, [r2, #64]
    strh   r12, [r2, #80]
    strh   r12, [r2, #96]
    strh   r12, [r2, #112]
    add    r2,  r2,  #2
    cmp    r0,  r1
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
2:
    ldr    r8,  .Lpool8
    ldr    r9,  .Lpool8+4
    add    r12, r12, #8192
    add    r10, r5,  r7              /* r10[15:0] = d2 + d6 */
    sub    r14, r12, r6,  lsl #16    /* r14 = tmp1 << 3 = (d0 - d4) << 16 */
    smulbb r10, r8,  r10             /* r10 = z1 = (d2 + d6) * 4433 */
    add    r12, r12, r6,  lsl #16    /* r12 = tmp0 << 3= (d0 + d4) << 16 */
    smlatb r11, r8,  r7,  r10        /* r11 = tmp2 = z1 - d6 * 15137 */
    smlabb r10, r9,  r5,  r10        /* r10 = tmp3 = z1 + d2 * 6270 */
    add    r8,  r11, r14, asr #3     /* r8  = tmp11 */
    rsb    r11, r11, r14, asr #3     /* r11 = tmp12 */
    add    r14, r10, r12, asr #3     /* r14 = tmp10 */
    rsb    r12, r10, r12, asr #3     /* r12 = tmp13 */
    stmdb  sp,  { r8, r11, r12, r14 }/* tmp11 tmp12 tmp13 tmp10 */
    mov    r6,  r6,  asr #16         /* r6  = tmp1 = d5 */
    mov    r7,  r7,  asr #16         /* r7  = tmp0 = d7 */
    add    r12, r6,  r4,  asr #16    /* r12 = z4 = tmp1 + tmp3 */
    add    r14, r7,  r5,  asr #16    /* r14 = z3 = tmp0 + tmp2 */
    add    r8,  r12, r14             /* r8  = z3 + z4 */
    ldr    r10, .Lpool8+8
    ldr    r11, .Lpool8+12
    smultb r8,  r9,  r8              /* r8  = z5 = (z3 + z4) * 9633 */
    add    r9,  r7,  r4,  asr #16    /* r9  = z1 = tmp0 + tmp3 */
    smlabb r14, r10, r14, r8         /* r14 = z3 = z5 - z3 * 16069 */
    smlatb r12, r10, r12, r8         /* r12 = z4 = z5 - z4 * 3196 */
    smlabb r8,  r11, r9,  r14        /* r8  = z3 - z1 * 7373 */
    smlabb r9,  r11, r9,  r12        /* r9  = z4 - z1 * 7373 */
    add    r10, r6,  r5,  asr #16    /* r10 = z2 = tmp1 + tmp2 */
    smlatb r12, r11, r10, r12        /* r12 = z4 - z2 * 20995 */
    smlatb r14, r11, r10, r14        /* r14 = z3 - z2 * 20995 */
    ldr    r10, .Lpool8+16
    ldr    r11, .Lpool8+20
    smlabb r7,  r10, r7,  r8         /* r7 = tmp0 */
    smlatt r4,  r10, r4,  r9         /* r4 = tmp3 */
    smlabb r6,  r11, r6,  r12        /* r6 = tmp1 */
    smlatt r5,  r11, r5,  r14        /* r5 = tmp2 */
    ldmdb  sp,  { r8-r11 }           /* tmp11 tmp12 tmp13 tmp10 */
    add    r12, r8,  r5              /* o1 */
    sub    r14, r8,  r5              /* o6 */
    add    r8,  r9,  r6              /* o2 */
    sub    r9,  r9,  r6              /* o5 */
    add    r6,  r10, r7              /* o3 */
    sub    r7,  r10, r7              /* o4 */
    add    r10, r11, r4              /* o0 */
    sub    r11, r11, r4              /* o7 */
    mov    r12, r12, asr #11
    mov    r14, r14, asr #11
    mov    r8,  r8,  asr #11
    mov    r9,  r9,  asr #11
    mov    r6,  r6,  asr #11
    mov    r7,  r7,  asr #11
    mov    r10, r10, asr #11
    mov    r11, r11, asr #11
    strh   r10, [r2]
    strh   r12, [r2, #16]
    strh   r8,  [r2, #32]
    strh   r6,  [r2, #48]
    strh   r7,  [r2, #64]
    strh   r9,  [r2, #80]
    strh   r14, [r2, #96]
    strh   r11, [r2, #112]
#endif
    cmp    r0,  r1
    add    r2,  r2,  #2
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
    .size jpeg_idct8v, .-jpeg_idct8v

#if ARM_ARCH > 4
    .align 4
.Lpool8:
    .short 4433
    .short -15137
    .short 6270
    .short 9633
    .short -16069
    .short -3196
    .short -7373
    .short -20995
    .short 2446
    .short 12299
    .short 16819
    .short 25172
    .align 2
#endif

jpeg_idct8h:
    stmdb  sp!, { r4-r11, lr }
1:
    ldmia  r0!, { r4-r7 }
    ldr    r14, =(4112<<16)
#if ARM_ARCH < 5
    add    r8,  r14, r4,  lsl #16
    orrs   r9,  r6,  r7
    orreqs r9,  r5,  r4, lsr #16
    bne    2f
    mov    r8,  r8,  asr #21
    cmp    r8,  #255
    mvnhi  r8,  r8,  asr #31
    strb   r8,  [r1]
    strb   r8,  [r1, #pix8_size]
    strb   r8,  [r1, #2*pix8_size]
    strb   r8,  [r1, #3*pix8_size]
    strb   r8,  [r1, #4*pix8_size]
    strb   r8,  [r1, #5*pix8_size]
    strb   r8,  [r1, #6*pix8_size]
    strb   r8,  [r1, #7*pix8_size]
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
2:
    ldr    r14, =4433
    ldr    r12, =-15137
    mov    r10, r5,  lsl #16
    mov    r11, r7,  lsl #16
    mov    r10, r10, asr #16        /* r10 = z2 = d2 */
    mov    r11, r11, asr #16        /* r11 = z3 = d6 */
    add    r9,  r10, r11
    mov    r8,  r8,  asr #3         /* r8  = z4 = (d0 + 4112) << 13 */
    mul    r9,  r14, r9             /* r9  = z1 = (z2 + z3) * 4433 */
    ldr    r14, =6270
    mla    r11, r12, r11, r9         /* r11 = tmp2 = z1 - z3 * 15137 */
    mla    r10, r14, r10, r9         /* r10 = tmp3 = z1 + z2 * 6270 */
    mov    r9,  r6,  lsl #16         /* r9  = z5 << 3 = d4 << 16 */
    add    r12, r8,  r9,  asr #3     /* r12 = tmp0 = z4 + z5 */
    sub    r14, r8,  r9,  asr #3     /* r14 = tmp1 = z4 - z5 */
    add    r8,  r12, r10             /* r8  = tmp10 = tmp0 + tmp3 */
    sub    r9,  r12, r10             /* r9  = tmp13 = tmp0 - tmp3 */
    add    r10, r14, r11             /* r10 = tmp11 = tmp1 + tmp2 */
    sub    r11, r14, r11             /* r11 = tmp12 = tmp1 - tmp2 */
    stmdb  sp,  { r8-r11 }           /* tmp10 tmp13 tmp11 tmp12 */
    mov    r4,  r4,  asr #16         /* r4  = tmp3 = d1 */
    mov    r5,  r5,  asr #16         /* r5  = tmp2 = d3 */
    mov    r6,  r6,  asr #16         /* r6  = tmp1 = d5 */
    mov    r7,  r7,  asr #16         /* r7  = tmp0 = d7 */
    ldr    r10, =9633
    ldr    r11, =-16069
    add    r12, r5,  r7              /* r12 = z3 = tmp0 + tmp2 */
    add    r14, r4,  r6              /* r14 = z4 = tmp1 + tmp3 */
    add    r9,  r12, r14             /* r9  = z3 + z4 */
    mul    r9,  r10, r9              /* r9  = z5 = (z3 + z4) * 9633 */
    ldr    r10, =-3196
    mla    r12, r11, r12, r9         /* r12 = z3 = z5 - z3 * 16069 */
    ldr    r11, =-7373
    mla    r14, r10, r14, r9         /* r14 = z4 = z5 - z4 * 3196 */
    ldr    r10, =2446
    add    r9,  r4,  r7              /* r9  = tmp0 + tmp3 */
    mla    r8,  r11, r9,  r12        /* r8  = z1 + z3 */
    mla    r9,  r11, r9,  r14        /* r9  = z1 + z4 */
    ldr    r11, =12299
    mla    r7,  r10, r7,  r8         /* r7  = tmp0 = z1 + z3 + tmp0 * 2446 */
    ldr    r10, =-20995
    mla    r4,  r11, r4,  r9         /* r4  = tmp3 = z1 + z4 + tmp0 * 12299 */
    ldr    r11, =25172
    add    r9,  r5,  r6              /* r9  = tmp1 + tmp2 */
    mla    r12, r10, r9, r12         /* r12 = z2 + z3 */
    mla    r14, r10, r9, r14         /* r14 = z2 + z4 */
    ldr    r10, =16819
    mla    r5,  r11, r5, r12         /* r5  = tmp2 = z2 + z3 + tmp2 * 25172 */
    mla    r6,  r10, r6, r14         /* r6  = tmp1 = z2 + z4 + tmp1 * 16819 */
    ldmdb  sp,  { r8-r11 }
    add    r12, r8,  r4              /* o0 */
    sub    r14, r8,  r4              /* o7 */
    add    r8,  r9,  r7              /* o3 */
    sub    r9,  r9,  r7              /* o4 */
    add    r4,  r10, r5              /* O1 */
    sub    r5,  r10, r5              /* o6 */
    add    r10, r11, r6              /* o2 */
    sub    r11, r11, r6              /* o5 */
    /* output in order: r12 r4  r10 r8  r9  r11 r5  r14 */
    mov    r12, r12, asr #18
    cmp    r12, #255
    mvnhi  r12, r12, asr #31
    mov    r4,  r4,  asr #18
    cmp    r4,  #255
    mvnhi  r4,  r4,  asr #31
    mov    r10, r10, asr #18
    cmp    r10, #255
    mvnhi  r10, r10, asr #31
    mov    r8,  r8,  asr #18
    cmp    r8,  #255
    mvnhi  r8,  r8,  asr #31
    mov    r9,  r9,  asr #18
    cmp    r9,  #255
    mvnhi  r9,  r9,  asr #31
    mov    r11, r11, asr #18
    cmp    r11, #255
    mvnhi  r11, r11, asr #31
    mov    r5,  r5,  asr #18
    cmp    r5,  #255
    mvnhi  r5,  r5,  asr #31
    mov    r14, r14, asr #18
    cmp    r14, #255
    mvnhi  r14, r14, asr #31
    strb   r12, [r1]
    strb   r4,  [r1, #pix8_size]
    strb   r10, [r1, #2*pix8_size]
    strb   r8,  [r1, #3*pix8_size]
    strb   r9,  [r1, #4*pix8_size]
    strb   r11, [r1, #5*pix8_size]
    strb   r5,  [r1, #6*pix8_size]
    strb   r14, [r1, #7*pix8_size]
#else /* ARMv5+ */
    add    r12, r14, r4,  lsl #16
    orrs   r9,  r6,  r7
    orreqs r9,  r5,  r4,  lsr #16
    bne    2f
    mov    r12, r12, asr #21
    cmp    r12, #255
    mvnhi  r12, r12, asr #31
    strb   r12, [r1]
    strb   r12, [r1, #pix8_size]
    strb   r12, [r1, #2*pix8_size]
    strb   r12, [r1, #3*pix8_size]
    strb   r12, [r1, #4*pix8_size]
    strb   r12, [r1, #5*pix8_size]
    strb   r12, [r1, #6*pix8_size]
    strb   r12, [r1, #7*pix8_size]
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
2:
    ldr    r8,  .Lpool8
    ldr    r9,  .Lpool8+4
    add    r10, r5,  r7              /* r10[15:0] = d2 + d6 */
    sub    r14, r12, r6,  lsl #16    /* r14 = tmp1 << 3 = (d0 - d4) << 16 */
    smulbb r10, r8,  r10             /* r10 = z1 = (d2 + d6) * 4433 */
    add    r12, r12, r6,  lsl #16    /* r12 = tmp0 << 3= (d0 + d4) << 16 */
    smlatb r11, r8,  r7,  r10        /* r11 = tmp2 = z1 - d6 * 15137 */
    smlabb r10, r9,  r5,  r10        /* r10 = tmp3 = z1 + d2 * 6270 */
    add    r8,  r11, r14, asr #3     /* r8  = tmp11 */
    rsb    r11, r11, r14, asr #3     /* r11 = tmp12 */
    add    r14, r10, r12, asr #3     /* r14 = tmp10 */
    rsb    r12, r10, r12, asr #3     /* r12 = tmp13 */
    stmdb  sp,  { r8, r11, r12, r14 }/* tmp11 tmp12 tmp13 tmp10 */
    mov    r6,  r6,  asr #16         /* r6  = tmp1 = d5 */
    mov    r7,  r7,  asr #16         /* r7  = tmp0 = d7 */
    add    r12, r6,  r4,  asr #16    /* r12 = z4 = tmp1 + tmp3 */
    add    r14, r7,  r5,  asr #16    /* r14 = z3 = tmp0 + tmp2 */
    add    r8,  r12, r14             /* r8  = z3 + z4 */
    ldr    r10, .Lpool8+8
    ldr    r11, .Lpool8+12
    smultb r8,  r9,  r8              /* r8  = z5 = (z3 + z4) * 9633 */
    add    r9,  r7,  r4,  asr #16    /* r9  = z1 = tmp0 + tmp3 */
    smlabb r14, r10, r14, r8         /* r14 = z3 = z5 - z3 * 16069 */
    smlatb r12, r10, r12, r8         /* r12 = z4 = z5 - z4 * 3196 */
    smlabb r8,  r11, r9,  r14        /* r8  = z3 - z1 * 7373 */
    smlabb r9,  r11, r9,  r12        /* r9  = z4 - z1 * 7373 */
    add    r10, r6,  r5,  asr #16    /* r10 = z2 = tmp1 + tmp2 */
    smlatb r12, r11, r10, r12        /* r12 = z4 - z2 * 20995 */
    smlatb r14, r11, r10, r14        /* r14 = z3 - z2 * 20995 */
    ldr    r10, .Lpool8+16
    ldr    r11, .Lpool8+20
    smlabb r7,  r10, r7,  r8         /* r7 = tmp0 */
    smlatt r4,  r10, r4,  r9         /* r4 = tmp3 */
    smlabb r6,  r11, r6,  r12        /* r6 = tmp1 */
    smlatt r5,  r11, r5,  r14        /* r5 = tmp2 */
    ldmdb  sp,  { r8-r11 }           /* tmp11 tmp12 tmp13 tmp10 */
    add    r12, r8,  r5              /* o1 */
    sub    r14, r8,  r5              /* o6 */
    add    r8,  r9,  r6              /* o2 */
    sub    r9,  r9,  r6              /* o5 */
    add    r6,  r10, r7              /* o3 */
    sub    r7,  r10, r7              /* o4 */
    add    r10, r11, r4              /* o0 */
    sub    r11, r11, r4              /* o7 */
    /* output in order: r10 r12 r8  r6  r7  r9  r14 r11 */
    mov    r10, r10, asr #18
    cmp    r10, #255
    mvnhi  r10, r10, asr #31
    mov    r12, r12, asr #18
    cmp    r12, #255
    mvnhi  r12, r12, asr #31
    mov    r8,  r8,  asr #18
    cmp    r8,  #255
    mvnhi  r8,  r8,  asr #31
    mov    r6,  r6,  asr #18
    cmp    r6,  #255
    mvnhi  r6,  r6,  asr #31
    mov    r7,  r7,  asr #18
    cmp    r7,  #255
    mvnhi  r7,  r7,  asr #31
    mov    r9,  r9,  asr #18
    cmp    r9,  #255
    mvnhi  r9,  r9,  asr #31
    mov    r14, r14, asr #18
    cmp    r14, #255
    mvnhi  r14, r14, asr #31
    mov    r11, r11, asr #18
    cmp    r11, #255
    mvnhi  r11, r11, asr #31
    strb   r10, [r1]
    strb   r12, [r1, #pix8_size]
    strb   r8,  [r1, #2*pix8_size]
    strb   r6,  [r1, #3*pix8_size]
    strb   r7,  [r1, #4*pix8_size]
    strb   r9,  [r1, #5*pix8_size]
    strb   r14, [r1, #6*pix8_size]
    strb   r11, [r1, #7*pix8_size]
#endif
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
    .size jpeg_idct8h, .-jpeg_idct8h
#else
jpeg_idct8v:
    stmdb  sp!, { r4-r11, lr }
    add    r2,  r0,  #128
1:
    ldmia  r0!, { r4-r7 }
    orrs   r9,  r6,  r7
    orreqs r9,  r5,  r4,  lsr #16
    bne    2f
    mov    r4,  r4,  lsl #2
    strh   r4,  [r2]
    strh   r4,  [r2, #16]
    strh   r4,  [r2, #32]
    strh   r4,  [r2, #48]
    strh   r4,  [r2, #64]
    strh   r4,  [r2, #80]
    strh   r4,  [r2, #96]
    strh   r4,  [r2, #112]
    cmp    r0,  r1
    add    r2,  r2,  #2
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
2:
    ldrd   r8,  .Lpool8
    mov    r12, r4,  lsl #16
    add    r10, r5,  r7              /* r10 = d2 + d6 */
    add    r12, r12, #8192
    add    r3,  r12, r6, lsl #16     /* tmp0 */
    sub    r12, r12, r6, lsl #16     /* tmp1 */
    pkhtb  r4,  r5,  r4,  asr #16    /* r4  = (tmp3[o], tmp2[0]) = (d1, d3) */
    smulbb r14, r8,  r10             /* r14 = z1[e] = (d2 + d6) * 4433 */
    pkhtb  r6,  r6,  r7,  asr #16    /* r6  = (tmp0[o], tmp1[o]) = (d7, d5) */
    smlatb r7,  r8,  r7,  r14        /* r7  = tmp2[e] = z1 - d6 * 15137 */
    smlabb r5,  r9,  r5,  r14        /* r5  = tmp3[e] = z1 + d2 * 6270 */
    pkhtb  r9,  r9,  r9,  asr #16    /* r9  = (9633, 9633) */
    add    r10, r5,  r3,  asr #3     /* r10 = tmp10 */
    rsb    r11, r5,  r3,  asr #3     /* r11 = tmp13 */
    mov    r3,  r4,  ror #16
    rsb    r14, r7,  r12, asr #3     /* r14 = tmp12 */
    add    r12, r7,  r12, asr #3     /* r12 = tmp11 */
    sadd16 r8,  r3,  r6              /* z3, z4 */
    stmdb  sp,   { r10-r12, r14 }    /* tmp10 tmp13 tmp11 tmp12 */
    smuad  r5,  r9,  r8              /* r5  = z5 = (z3[o] + z4[o]) * 9633 */
    ldrd   r10, .Lpool8+8
    sadd16 r7,  r4,  r6              /* r7  = (z1, z2) */
    smlatt r9,  r10, r8,  r5         /* r9  = z4 = z5 - z4 * 16069 */
    smlabb r8,  r10, r8,  r5         /* r8  = z3 = z5 - z3 * 3196 */
    smlabb r14, r11, r7,  r9         /* r14 = z1 + z4 */
    smlabb r12, r11, r7,  r8         /* r12 = z1 + z3 */
    smlatt r5,  r11, r7,  r9         /* r5  = z2 + z4 */
    smlatt r7,  r11, r7,  r8         /* r7  = z2 + z3 */
    ldrd   r8,  .Lpool8+16
    smlabt r7,  r9,  r4,  r7         /* r7  = tmp2 */
    smlatb r14, r9,  r4,  r14        /* r14 = tmp3 */
    ldmdb  sp,  { r4, r9-r11 }       /* tmp10 tmp13 tmp11 tmp12 */
    smlabb r12, r8,  r6,  r12        /* r12 = tmp0 */
    smlatt r5,  r8,  r6,  r5         /* r5  = tmp1 */
    /* used: r4, r5, r7, r9-r12, r14 */
    add    r6,  r4,  r14             /* o0 */
    sub    r8,  r4,  r14             /* o7 */
    add    r14, r9,  r12             /* o3 */
    sub    r12, r9,  r12             /* o4 */
    add    r4,  r10, r7              /* o1 */
    sub    r7,  r10, r7              /* o6 */
    add    r9,  r11, r5              /* o2 */
    sub    r10, r11, r5              /* o5 */
    mov    r6,  r6,  asr #11
    mov    r4,  r4,  asr #11
    mov    r9,  r9,  asr #11
    mov    r14, r14, asr #11
    mov    r12, r12, asr #11
    mov    r10, r10, asr #11
    mov    r7,  r7,  asr #11
    mov    r8,  r8,  asr #11
    strh   r6,  [r2]
    strh   r4,  [r2, #16]
    strh   r9,  [r2, #32]
    strh   r14, [r2, #48]
    strh   r12, [r2, #64]
    strh   r10, [r2, #80]
    strh   r7,  [r2, #96]
    strh   r8,  [r2, #112]
    cmp    r0,  r1
    add    r2,  r2,  #2
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
    .size jpeg_idct8v, .-jpeg_idct8v

    .align 4
.Lpool8:
    .short 4433
    .short -15137
    .short 6270
    .short 9633
    .short -16069
    .short -3196
    .short -7373
    .short -20995
    .short 2446
    .short 16819
    .short 25172
    .short 12299

    .align 2
jpeg_idct8h:
    stmdb  sp!, { r4-r11, lr }
1:
    ldr    r14, =4112
    ldmia  r0!, { r4-r7 }
    sadd16 r4,  r4,  r14
    orrs   r9,  r6,  r7
    orreqs r9,  r5,  r4,  lsr #16
    bne    2f
    sxth   r4,  r4
    usat   r4,  #8,  r4,  asr #5
    strb   r4,  [r1]
    strb   r4,  [r1, #pix8_size]
    strb   r4,  [r1, #2*pix8_size]
    strb   r4,  [r1, #3*pix8_size]
    strb   r4,  [r1, #4*pix8_size]
    strb   r4,  [r1, #5*pix8_size]
    strb   r4,  [r1, #6*pix8_size]
    strb   r4,  [r1, #7*pix8_size]
    add    r1,  r1,  r3
    cmp    r0,  r2
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
2:
    ldrd   r8,  .Lpool8
    sadd16 r10, r5,  r7              /* r10 = (d2 + d6, d3 + d7) */
    ssub16 r12, r4,  r6              /* r12 = (d0 - d4, d1 - d5) */
    sadd16 r11, r4,  r6              /* r11 = (d0 + d4, d1 + d5) */
    pkhtb  r4,  r5,  r4,  asr #16    /* r4  = (tmp3[o], tmp2[0]) = (d1, d3) */
    smulbb r14, r8,  r10             /* r14 = z1[e] = (d2 + d6) * 4433 */
    pkhtb  r6,  r6,  r7,  asr #16    /* r6  = (tmp0[o], tmp1[o]) = (d7, d5) */
    smlatb r7,  r8,  r7,  r14        /* r7  = tmp2[e] = z1 - d6 * 15137 */
    smlabb r5,  r9,  r5,  r14        /* r5  = tmp3[e] = z1 + d2 * 6270 */
    sxth   r12, r12                  /* r12 = tmp1[e] = d0 - d4 */
    pkhtb  r8,  r11, r10, asr #16    /* r8  = (z3[o], z4[o]) */
    sxth   r14, r11                  /* r14 = tmp0[e] */
    pkhtb  r9,  r9,  r9,  asr #16    /* r9  = (9633, 9633) */
    add    r10, r5,  r14, lsl #13    /* r10 = tmp10 */
    rsb    r11, r5,  r14, lsl #13    /* r11 = tmp13 */
    rsb    r14, r7,  r12, lsl #13    /* r14 = tmp12 */
    add    r12, r7,  r12, lsl #13    /* r12 = tmp11 */
    stmdb  sp,   { r10-r12, r14 }    /* tmp10 tmp13 tmp11 tmp12 */
    smuad  r5,  r9,  r8              /* r5  = z5 = (z3[o] + z4[o]) * 9633 */
    ldrd   r10, .Lpool8+8
    sadd16 r7,  r4,  r6              /* r7  = (z1, z2) */
    smlatt r9,  r10, r8,  r5         /* r9  = z4 = z5 - z4 * 16069 */
    smlabb r8,  r10, r8,  r5         /* r8  = z3 = z5 - z3 * 3196 */
    smlabb r14, r11, r7,  r9         /* r14 = z1 + z4 */
    smlabb r12, r11, r7,  r8         /* r12 = z1 + z3 */
    smlatt r5,  r11, r7,  r9         /* r5  = z2 + z4 */
    smlatt r7,  r11, r7,  r8         /* r7  = z2 + z3 */
    ldrd   r8,  .Lpool8+16
    smlabt r7,  r9,  r4,  r7         /* r7  = tmp2 */
    smlatb r14, r9,  r4,  r14        /* r14 = tmp3 */
    ldmdb  sp,  { r4, r9-r11 }       /* tmp10 tmp13 tmp11 tmp12 */
    smlabb r12, r8,  r6,  r12        /* r12 = tmp0 */
    smlatt r5,  r8,  r6,  r5         /* r5  = tmp1 */
    /* used: r4, r5, r7, r9-r12, r14 */
    add    r6,  r4,  r14             /* o0 */
    sub    r8,  r4,  r14             /* o7 */
    add    r14, r9,  r12             /* o3 */
    sub    r12, r9,  r12             /* o4 */
    add    r4,  r10, r7              /* o1 */
    sub    r7,  r10, r7              /* o6 */
    add    r9,  r11, r5              /* o2 */
    sub    r10, r11, r5              /* o5 */
    usat   r6,  #8,  r6,  asr #18
    usat   r4,  #8,  r4,  asr #18
    usat   r9,  #8,  r9,  asr #18
    usat   r14, #8,  r14, asr #18
    usat   r12, #8,  r12, asr #18
    usat   r10, #8,  r10, asr #18
    usat   r7,  #8,  r7,  asr #18
    usat   r8,  #8,  r8,  asr #18
    strb   r6,  [r1]
    strb   r4,  [r1, #pix8_size]
    strb   r9,  [r1, #2*pix8_size]
    strb   r14, [r1, #3*pix8_size]
    strb   r12, [r1, #4*pix8_size]
    strb   r10, [r1, #5*pix8_size]
    strb   r7,  [r1, #6*pix8_size]
    strb   r8,  [r1, #7*pix8_size]
    cmp    r0,  r2
    add    r1,  r1,  r3
    bcc    1b
    ldmia  sp!, { r4-r11, pc }
    .size jpeg_idct8h, .-jpeg_idct8h
#endif