summaryrefslogtreecommitdiff
path: root/2.3-1/thirdparty/includes/OpenCV/opencv2/gpu/device/simd_functions.hpp
blob: b0377e533e8cf78db37ccfdfdb7e89494213f88d (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
/*M///////////////////////////////////////////////////////////////////////////////////////
//
//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install,
//  copy or use the software.
//
//
//                           License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//
//   * Redistribution's in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//
//   * The name of the copyright holders may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/

/*
 * Copyright (c) 2013 NVIDIA Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 *   Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 *   Neither the name of NVIDIA Corporation nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __OPENCV_GPU_SIMD_FUNCTIONS_HPP__
#define __OPENCV_GPU_SIMD_FUNCTIONS_HPP__

#include "common.hpp"

/*
  This header file contains inline functions that implement intra-word SIMD
  operations, that are hardware accelerated on sm_3x (Kepler) GPUs. Efficient
  emulation code paths are provided for earlier architectures (sm_1x, sm_2x)
  to make the code portable across all GPUs supported by CUDA. The following
  functions are currently implemented:

  vadd2(a,b)      per-halfword unsigned addition, with wrap-around: a + b
  vsub2(a,b)      per-halfword unsigned subtraction, with wrap-around: a - b
  vabsdiff2(a,b)  per-halfword unsigned absolute difference: |a - b|
  vavg2(a,b)      per-halfword unsigned average: (a + b) / 2
  vavrg2(a,b)     per-halfword unsigned rounded average: (a + b + 1) / 2
  vseteq2(a,b)    per-halfword unsigned comparison: a == b ? 1 : 0
  vcmpeq2(a,b)    per-halfword unsigned comparison: a == b ? 0xffff : 0
  vsetge2(a,b)    per-halfword unsigned comparison: a >= b ? 1 : 0
  vcmpge2(a,b)    per-halfword unsigned comparison: a >= b ? 0xffff : 0
  vsetgt2(a,b)    per-halfword unsigned comparison: a > b ? 1 : 0
  vcmpgt2(a,b)    per-halfword unsigned comparison: a > b ? 0xffff : 0
  vsetle2(a,b)    per-halfword unsigned comparison: a <= b ? 1 : 0
  vcmple2(a,b)    per-halfword unsigned comparison: a <= b ? 0xffff : 0
  vsetlt2(a,b)    per-halfword unsigned comparison: a < b ? 1 : 0
  vcmplt2(a,b)    per-halfword unsigned comparison: a < b ? 0xffff : 0
  vsetne2(a,b)    per-halfword unsigned comparison: a != b ? 1 : 0
  vcmpne2(a,b)    per-halfword unsigned comparison: a != b ? 0xffff : 0
  vmax2(a,b)      per-halfword unsigned maximum: max(a, b)
  vmin2(a,b)      per-halfword unsigned minimum: min(a, b)

  vadd4(a,b)      per-byte unsigned addition, with wrap-around: a + b
  vsub4(a,b)      per-byte unsigned subtraction, with wrap-around: a - b
  vabsdiff4(a,b)  per-byte unsigned absolute difference: |a - b|
  vavg4(a,b)      per-byte unsigned average: (a + b) / 2
  vavrg4(a,b)     per-byte unsigned rounded average: (a + b + 1) / 2
  vseteq4(a,b)    per-byte unsigned comparison: a == b ? 1 : 0
  vcmpeq4(a,b)    per-byte unsigned comparison: a == b ? 0xff : 0
  vsetge4(a,b)    per-byte unsigned comparison: a >= b ? 1 : 0
  vcmpge4(a,b)    per-byte unsigned comparison: a >= b ? 0xff : 0
  vsetgt4(a,b)    per-byte unsigned comparison: a > b ? 1 : 0
  vcmpgt4(a,b)    per-byte unsigned comparison: a > b ? 0xff : 0
  vsetle4(a,b)    per-byte unsigned comparison: a <= b ? 1 : 0
  vcmple4(a,b)    per-byte unsigned comparison: a <= b ? 0xff : 0
  vsetlt4(a,b)    per-byte unsigned comparison: a < b ? 1 : 0
  vcmplt4(a,b)    per-byte unsigned comparison: a < b ? 0xff : 0
  vsetne4(a,b)    per-byte unsigned comparison: a != b ? 1: 0
  vcmpne4(a,b)    per-byte unsigned comparison: a != b ? 0xff: 0
  vmax4(a,b)      per-byte unsigned maximum: max(a, b)
  vmin4(a,b)      per-byte unsigned minimum: min(a, b)
*/

namespace cv { namespace gpu { namespace device
{
    // 2

    static __device__ __forceinline__ unsigned int vadd2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vadd2.u32.u32.u32.sat %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vadd.u32.u32.u32.sat %0.h0, %1.h0, %2.h0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vadd.u32.u32.u32.sat %0.h1, %1.h1, %2.h1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s;
        s = a ^ b;          // sum bits
        r = a + b;          // actual sum
        s = s ^ r;          // determine carry-ins for each bit position
        s = s & 0x00010000; // carry-in to high word (= carry-out from low word)
        r = r - s;          // subtract out carry-out from low word
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsub2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vsub2.u32.u32.u32.sat %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vsub.u32.u32.u32.sat %0.h0, %1.h0, %2.h0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vsub.u32.u32.u32.sat %0.h1, %1.h1, %2.h1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s;
        s = a ^ b;          // sum bits
        r = a - b;          // actual sum
        s = s ^ r;          // determine carry-ins for each bit position
        s = s & 0x00010000; // borrow to high word
        r = r + s;          // compensate for borrow from low word
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vabsdiff2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vabsdiff2.u32.u32.u32.sat %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vabsdiff.u32.u32.u32.sat %0.h0, %1.h0, %2.h0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vabsdiff.u32.u32.u32.sat %0.h1, %1.h1, %2.h1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s, t, u, v;
        s = a & 0x0000ffff; // extract low halfword
        r = b & 0x0000ffff; // extract low halfword
        u = ::max(r, s);    // maximum of low halfwords
        v = ::min(r, s);    // minimum of low halfwords
        s = a & 0xffff0000; // extract high halfword
        r = b & 0xffff0000; // extract high halfword
        t = ::max(r, s);    // maximum of high halfwords
        s = ::min(r, s);    // minimum of high halfwords
        r = u | t;          // maximum of both halfwords
        s = v | s;          // minimum of both halfwords
        r = r - s;          // |a - b| = max(a,b) - min(a,b);
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vavg2(unsigned int a, unsigned int b)
    {
        unsigned int r, s;

        // HAKMEM #23: a + b = 2 * (a & b) + (a ^ b) ==>
        // (a + b) / 2 = (a & b) + ((a ^ b) >> 1)
        s = a ^ b;
        r = a & b;
        s = s & 0xfffefffe; // ensure shift doesn't cross halfword boundaries
        s = s >> 1;
        s = r + s;

        return s;
    }

    static __device__ __forceinline__ unsigned int vavrg2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vavrg2.u32.u32.u32 %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        // HAKMEM #23: a + b = 2 * (a | b) - (a ^ b) ==>
        // (a + b + 1) / 2 = (a | b) - ((a ^ b) >> 1)
        unsigned int s;
        s = a ^ b;
        r = a | b;
        s = s & 0xfffefffe; // ensure shift doesn't cross half-word boundaries
        s = s >> 1;
        r = r - s;
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vseteq2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset2.u32.u32.eq %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        // inspired by Alan Mycroft's null-byte detection algorithm:
        // null_byte(x) = ((x - 0x01010101) & (~x & 0x80808080))
        unsigned int c;
        r = a ^ b;          // 0x0000 if a == b
        c = r | 0x80008000; // set msbs, to catch carry out
        r = r ^ c;          // extract msbs, msb = 1 if r < 0x8000
        c = c - 0x00010001; // msb = 0, if r was 0x0000 or 0x8000
        c = r & ~c;         // msb = 1, if r was 0x0000
        r = c >> 15;        // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmpeq2(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vseteq2(a, b);
        c = r << 16;        // convert bool
        r = c - r;          //  into mask
    #else
        // inspired by Alan Mycroft's null-byte detection algorithm:
        // null_byte(x) = ((x - 0x01010101) & (~x & 0x80808080))
        r = a ^ b;          // 0x0000 if a == b
        c = r | 0x80008000; // set msbs, to catch carry out
        r = r ^ c;          // extract msbs, msb = 1 if r < 0x8000
        c = c - 0x00010001; // msb = 0, if r was 0x0000 or 0x8000
        c = r & ~c;         // msb = 1, if r was 0x0000
        r = c >> 15;        // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetge2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset2.u32.u32.ge %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int c;
        asm("not.b32 %0, %0;" : "+r"(b));
        c = vavrg2(a, b);   // (a + ~b + 1) / 2 = (a - b) / 2
        c = c & 0x80008000; // msb = carry-outs
        r = c >> 15;        // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmpge2(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetge2(a, b);
        c = r << 16;        // convert bool
        r = c - r;          //  into mask
    #else
        asm("not.b32 %0, %0;" : "+r"(b));
        c = vavrg2(a, b);   // (a + ~b + 1) / 2 = (a - b) / 2
        c = c & 0x80008000; // msb = carry-outs
        r = c >> 15;        // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetgt2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset2.u32.u32.gt %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int c;
        asm("not.b32 %0, %0;" : "+r"(b));
        c = vavg2(a, b);    // (a + ~b) / 2 = (a - b) / 2 [rounded down]
        c = c & 0x80008000; // msbs = carry-outs
        r = c >> 15;        // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmpgt2(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetgt2(a, b);
        c = r << 16;        // convert bool
        r = c - r;          //  into mask
    #else
        asm("not.b32 %0, %0;" : "+r"(b));
        c = vavg2(a, b);    // (a + ~b) / 2 = (a - b) / 2 [rounded down]
        c = c & 0x80008000; // msbs = carry-outs
        r = c >> 15;        // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetle2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset2.u32.u32.le %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int c;
        asm("not.b32 %0, %0;" : "+r"(a));
        c = vavrg2(a, b);   // (b + ~a + 1) / 2 = (b - a) / 2
        c = c & 0x80008000; // msb = carry-outs
        r = c >> 15;        // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmple2(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetle2(a, b);
        c = r << 16;        // convert bool
        r = c - r;          //  into mask
    #else
        asm("not.b32 %0, %0;" : "+r"(a));
        c = vavrg2(a, b);   // (b + ~a + 1) / 2 = (b - a) / 2
        c = c & 0x80008000; // msb = carry-outs
        r = c >> 15;        // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetlt2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset2.u32.u32.lt %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int c;
        asm("not.b32 %0, %0;" : "+r"(a));
        c = vavg2(a, b);    // (b + ~a) / 2 = (b - a) / 2 [rounded down]
        c = c & 0x80008000; // msb = carry-outs
        r = c >> 15;        // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmplt2(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetlt2(a, b);
        c = r << 16;        // convert bool
        r = c - r;          //  into mask
    #else
        asm("not.b32 %0, %0;" : "+r"(a));
        c = vavg2(a, b);    // (b + ~a) / 2 = (b - a) / 2 [rounded down]
        c = c & 0x80008000; // msb = carry-outs
        r = c >> 15;        // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetne2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm ("vset2.u32.u32.ne %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        // inspired by Alan Mycroft's null-byte detection algorithm:
        // null_byte(x) = ((x - 0x01010101) & (~x & 0x80808080))
        unsigned int c;
        r = a ^ b;          // 0x0000 if a == b
        c = r | 0x80008000; // set msbs, to catch carry out
        c = c - 0x00010001; // msb = 0, if r was 0x0000 or 0x8000
        c = r | c;          // msb = 1, if r was not 0x0000
        c = c & 0x80008000; // extract msbs
        r = c >> 15;        // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmpne2(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetne2(a, b);
        c = r << 16;        // convert bool
        r = c - r;          //  into mask
    #else
        // inspired by Alan Mycroft's null-byte detection algorithm:
        // null_byte(x) = ((x - 0x01010101) & (~x & 0x80808080))
        r = a ^ b;          // 0x0000 if a == b
        c = r | 0x80008000; // set msbs, to catch carry out
        c = c - 0x00010001; // msb = 0, if r was 0x0000 or 0x8000
        c = r | c;          // msb = 1, if r was not 0x0000
        c = c & 0x80008000; // extract msbs
        r = c >> 15;        // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vmax2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vmax2.u32.u32.u32 %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vmax.u32.u32.u32 %0.h0, %1.h0, %2.h0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vmax.u32.u32.u32 %0.h1, %1.h1, %2.h1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s, t, u;
        r = a & 0x0000ffff; // extract low halfword
        s = b & 0x0000ffff; // extract low halfword
        t = ::max(r, s);    // maximum of low halfwords
        r = a & 0xffff0000; // extract high halfword
        s = b & 0xffff0000; // extract high halfword
        u = ::max(r, s);    // maximum of high halfwords
        r = t | u;          // combine halfword maximums
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vmin2(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vmin2.u32.u32.u32 %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vmin.u32.u32.u32 %0.h0, %1.h0, %2.h0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vmin.u32.u32.u32 %0.h1, %1.h1, %2.h1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s, t, u;
        r = a & 0x0000ffff; // extract low halfword
        s = b & 0x0000ffff; // extract low halfword
        t = ::min(r, s);    // minimum of low halfwords
        r = a & 0xffff0000; // extract high halfword
        s = b & 0xffff0000; // extract high halfword
        u = ::min(r, s);    // minimum of high halfwords
        r = t | u;          // combine halfword minimums
    #endif

        return r;
    }

    // 4

    static __device__ __forceinline__ unsigned int vadd4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vadd4.u32.u32.u32.sat %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vadd.u32.u32.u32.sat %0.b0, %1.b0, %2.b0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vadd.u32.u32.u32.sat %0.b1, %1.b1, %2.b1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vadd.u32.u32.u32.sat %0.b2, %1.b2, %2.b2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vadd.u32.u32.u32.sat %0.b3, %1.b3, %2.b3, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s, t;
        s = a ^ b;          // sum bits
        r = a & 0x7f7f7f7f; // clear msbs
        t = b & 0x7f7f7f7f; // clear msbs
        s = s & 0x80808080; // msb sum bits
        r = r + t;          // add without msbs, record carry-out in msbs
        r = r ^ s;          // sum of msb sum and carry-in bits, w/o carry-out
    #endif /* __CUDA_ARCH__ >= 300 */

        return r;
    }

    static __device__ __forceinline__ unsigned int vsub4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vsub4.u32.u32.u32.sat %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vsub.u32.u32.u32.sat %0.b0, %1.b0, %2.b0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vsub.u32.u32.u32.sat %0.b1, %1.b1, %2.b1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vsub.u32.u32.u32.sat %0.b2, %1.b2, %2.b2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vsub.u32.u32.u32.sat %0.b3, %1.b3, %2.b3, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s, t;
        s = a ^ ~b;         // inverted sum bits
        r = a | 0x80808080; // set msbs
        t = b & 0x7f7f7f7f; // clear msbs
        s = s & 0x80808080; // inverted msb sum bits
        r = r - t;          // subtract w/o msbs, record inverted borrows in msb
        r = r ^ s;          // combine inverted msb sum bits and borrows
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vavg4(unsigned int a, unsigned int b)
    {
        unsigned int r, s;

        // HAKMEM #23: a + b = 2 * (a & b) + (a ^ b) ==>
        // (a + b) / 2 = (a & b) + ((a ^ b) >> 1)
        s = a ^ b;
        r = a & b;
        s = s & 0xfefefefe; // ensure following shift doesn't cross byte boundaries
        s = s >> 1;
        s = r + s;

        return s;
    }

    static __device__ __forceinline__ unsigned int vavrg4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vavrg4.u32.u32.u32 %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        // HAKMEM #23: a + b = 2 * (a | b) - (a ^ b) ==>
        // (a + b + 1) / 2 = (a | b) - ((a ^ b) >> 1)
        unsigned int c;
        c = a ^ b;
        r = a | b;
        c = c & 0xfefefefe; // ensure following shift doesn't cross byte boundaries
        c = c >> 1;
        r = r - c;
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vseteq4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset4.u32.u32.eq %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        // inspired by Alan Mycroft's null-byte detection algorithm:
        // null_byte(x) = ((x - 0x01010101) & (~x & 0x80808080))
        unsigned int c;
        r = a ^ b;          // 0x00 if a == b
        c = r | 0x80808080; // set msbs, to catch carry out
        r = r ^ c;          // extract msbs, msb = 1 if r < 0x80
        c = c - 0x01010101; // msb = 0, if r was 0x00 or 0x80
        c = r & ~c;         // msb = 1, if r was 0x00
        r = c >> 7;         // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmpeq4(unsigned int a, unsigned int b)
    {
        unsigned int r, t;

    #if __CUDA_ARCH__ >= 300
        r = vseteq4(a, b);
        t = r << 8;         // convert bool
        r = t - r;          //  to mask
    #else
        // inspired by Alan Mycroft's null-byte detection algorithm:
        // null_byte(x) = ((x - 0x01010101) & (~x & 0x80808080))
        t = a ^ b;          // 0x00 if a == b
        r = t | 0x80808080; // set msbs, to catch carry out
        t = t ^ r;          // extract msbs, msb = 1 if t < 0x80
        r = r - 0x01010101; // msb = 0, if t was 0x00 or 0x80
        r = t & ~r;         // msb = 1, if t was 0x00
        t = r >> 7;         // build mask
        t = r - t;          //  from
        r = t | r;          //   msbs
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetle4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset4.u32.u32.le %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int c;
        asm("not.b32 %0, %0;" : "+r"(a));
        c = vavrg4(a, b);   // (b + ~a + 1) / 2 = (b - a) / 2
        c = c & 0x80808080; // msb = carry-outs
        r = c >> 7;         // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmple4(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetle4(a, b);
        c = r << 8;         // convert bool
        r = c - r;          //  to mask
    #else
        asm("not.b32 %0, %0;" : "+r"(a));
        c = vavrg4(a, b);   // (b + ~a + 1) / 2 = (b - a) / 2
        c = c & 0x80808080; // msbs = carry-outs
        r = c >> 7;         // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetlt4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset4.u32.u32.lt %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int c;
        asm("not.b32 %0, %0;" : "+r"(a));
        c = vavg4(a, b);    // (b + ~a) / 2 = (b - a) / 2 [rounded down]
        c = c & 0x80808080; // msb = carry-outs
        r = c >> 7;         // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmplt4(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetlt4(a, b);
        c = r << 8;         // convert bool
        r = c - r;          //  to mask
    #else
        asm("not.b32 %0, %0;" : "+r"(a));
        c = vavg4(a, b);    // (b + ~a) / 2 = (b - a) / 2 [rounded down]
        c = c & 0x80808080; // msbs = carry-outs
        r = c >> 7;         // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetge4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset4.u32.u32.ge %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int c;
        asm("not.b32 %0, %0;" : "+r"(b));
        c = vavrg4(a, b);   // (a + ~b + 1) / 2 = (a - b) / 2
        c = c & 0x80808080; // msb = carry-outs
        r = c >> 7;         // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmpge4(unsigned int a, unsigned int b)
    {
        unsigned int r, s;

    #if __CUDA_ARCH__ >= 300
        r = vsetge4(a, b);
        s = r << 8;         // convert bool
        r = s - r;          //  to mask
    #else
        asm ("not.b32 %0,%0;" : "+r"(b));
        r = vavrg4 (a, b);  // (a + ~b + 1) / 2 = (a - b) / 2
        r = r & 0x80808080; // msb = carry-outs
        s = r >> 7;         // build mask
        s = r - s;          //  from
        r = s | r;          //   msbs
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetgt4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset4.u32.u32.gt %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int c;
        asm("not.b32 %0, %0;" : "+r"(b));
        c = vavg4(a, b);    // (a + ~b) / 2 = (a - b) / 2 [rounded down]
        c = c & 0x80808080; // msb = carry-outs
        r = c >> 7;         // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmpgt4(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetgt4(a, b);
        c = r << 8;         // convert bool
        r = c - r;          //  to mask
    #else
        asm("not.b32 %0, %0;" : "+r"(b));
        c = vavg4(a, b);    // (a + ~b) / 2 = (a - b) / 2 [rounded down]
        c = c & 0x80808080; // msb = carry-outs
        r = c >> 7;         // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vsetne4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vset4.u32.u32.ne %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        // inspired by Alan Mycroft's null-byte detection algorithm:
        // null_byte(x) = ((x - 0x01010101) & (~x & 0x80808080))
        unsigned int c;
        r = a ^ b;          // 0x00 if a == b
        c = r | 0x80808080; // set msbs, to catch carry out
        c = c - 0x01010101; // msb = 0, if r was 0x00 or 0x80
        c = r | c;          // msb = 1, if r was not 0x00
        c = c & 0x80808080; // extract msbs
        r = c >> 7;         // convert to bool
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vcmpne4(unsigned int a, unsigned int b)
    {
        unsigned int r, c;

    #if __CUDA_ARCH__ >= 300
        r = vsetne4(a, b);
        c = r << 8;         // convert bool
        r = c - r;          //  to mask
    #else
        // inspired by Alan Mycroft's null-byte detection algorithm:
        // null_byte(x) = ((x - 0x01010101) & (~x & 0x80808080))
        r = a ^ b;          // 0x00 if a == b
        c = r | 0x80808080; // set msbs, to catch carry out
        c = c - 0x01010101; // msb = 0, if r was 0x00 or 0x80
        c = r | c;          // msb = 1, if r was not 0x00
        c = c & 0x80808080; // extract msbs
        r = c >> 7;         // convert
        r = c - r;          //  msbs to
        r = c | r;          //   mask
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vabsdiff4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vabsdiff4.u32.u32.u32.sat %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vabsdiff.u32.u32.u32.sat %0.b0, %1.b0, %2.b0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vabsdiff.u32.u32.u32.sat %0.b1, %1.b1, %2.b1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vabsdiff.u32.u32.u32.sat %0.b2, %1.b2, %2.b2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vabsdiff.u32.u32.u32.sat %0.b3, %1.b3, %2.b3, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s;
        s = vcmpge4(a, b);  // mask = 0xff if a >= b
        r = a ^ b;          //
        s = (r &  s) ^ b;   // select a when a >= b, else select b => max(a,b)
        r = s ^ r;          // select a when b >= a, else select b => min(a,b)
        r = s - r;          // |a - b| = max(a,b) - min(a,b);
    #endif

        return r;
    }

    static __device__ __forceinline__ unsigned int vmax4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vmax4.u32.u32.u32 %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vmax.u32.u32.u32 %0.b0, %1.b0, %2.b0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vmax.u32.u32.u32 %0.b1, %1.b1, %2.b1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vmax.u32.u32.u32 %0.b2, %1.b2, %2.b2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vmax.u32.u32.u32 %0.b3, %1.b3, %2.b3, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s;
        s = vcmpge4(a, b);  // mask = 0xff if a >= b
        r = a & s;          // select a when b >= a
        s = b & ~s;         // select b when b < a
        r = r | s;          // combine byte selections
    #endif

        return r;           // byte-wise unsigned maximum
    }

    static __device__ __forceinline__ unsigned int vmin4(unsigned int a, unsigned int b)
    {
        unsigned int r = 0;

    #if __CUDA_ARCH__ >= 300
        asm("vmin4.u32.u32.u32 %0, %1, %2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #elif __CUDA_ARCH__ >= 200
        asm("vmin.u32.u32.u32 %0.b0, %1.b0, %2.b0, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vmin.u32.u32.u32 %0.b1, %1.b1, %2.b1, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vmin.u32.u32.u32 %0.b2, %1.b2, %2.b2, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
        asm("vmin.u32.u32.u32 %0.b3, %1.b3, %2.b3, %3;" : "=r"(r) : "r"(a), "r"(b), "r"(r));
    #else
        unsigned int s;
        s = vcmpge4(b, a);  // mask = 0xff if a >= b
        r = a & s;          // select a when b >= a
        s = b & ~s;         // select b when b < a
        r = r | s;          // combine byte selections
    #endif

        return r;
    }
}}}

#endif // __OPENCV_GPU_SIMD_FUNCTIONS_HPP__