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
|
/******************************************************************************
* Copyright (c) 2016, 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 the 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 NVIDIA CORPORATION 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.
*
******************************************************************************/
#pragma once
#include <thrust/detail/config.h>
#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
#include <thrust/detail/config/exec_check_disable.h>
#include <thrust/detail/cstdint.h>
#include <thrust/detail/type_traits.h>
#include <thrust/distance.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/system/cuda/config.h>
#include <thrust/system/cuda/detail/dispatch.h>
#include <cub/device/device_scan.cuh>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub
{
namespace detail
{
__thrust_exec_check_disable__
template <typename Derived,
typename InputIt,
typename Size,
typename OutputIt,
typename ScanOp>
__host__ __device__
OutputIt inclusive_scan_n_impl(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
Size num_items,
OutputIt result,
ScanOp scan_op)
{
using Dispatch32 = cub::DispatchScan<InputIt,
OutputIt,
ScanOp,
cub::NullType,
thrust::detail::int32_t>;
using Dispatch64 = cub::DispatchScan<InputIt,
OutputIt,
ScanOp,
cub::NullType,
thrust::detail::int64_t>;
cudaStream_t stream = thrust::cuda_cub::stream(policy);
cudaError_t status;
// Determine temporary storage requirements:
size_t tmp_size = 0;
{
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
num_items,
(nullptr,
tmp_size,
first,
result,
scan_op,
cub::NullType{},
num_items_fixed,
stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(status,
"after determining tmp storage "
"requirements for inclusive_scan");
}
// Run scan:
{
// Allocate temporary storage:
thrust::detail::temporary_array<thrust::detail::uint8_t, Derived> tmp{
policy,
tmp_size};
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
num_items,
(tmp.data().get(),
tmp_size,
first,
result,
scan_op,
cub::NullType{},
num_items_fixed,
stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(status,
"after dispatching inclusive_scan kernel");
thrust::cuda_cub::throw_on_error(thrust::cuda_cub::synchronize_optional(policy),
"inclusive_scan failed to synchronize");
}
return result + num_items;
}
__thrust_exec_check_disable__
template <typename Derived,
typename InputIt,
typename Size,
typename OutputIt,
typename InitValueT,
typename ScanOp>
__host__ __device__
OutputIt exclusive_scan_n_impl(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
Size num_items,
OutputIt result,
InitValueT init,
ScanOp scan_op)
{
using InputValueT = cub::detail::InputValue<InitValueT>;
using Dispatch32 = cub::DispatchScan<InputIt,
OutputIt,
ScanOp,
InputValueT,
thrust::detail::int32_t>;
using Dispatch64 = cub::DispatchScan<InputIt,
OutputIt,
ScanOp,
InputValueT,
thrust::detail::int64_t>;
cudaStream_t stream = thrust::cuda_cub::stream(policy);
cudaError_t status;
// Determine temporary storage requirements:
size_t tmp_size = 0;
{
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
num_items,
(nullptr,
tmp_size,
first,
result,
scan_op,
InputValueT(init),
num_items_fixed,
stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(status,
"after determining tmp storage "
"requirements for exclusive_scan");
}
// Run scan:
{
// Allocate temporary storage:
thrust::detail::temporary_array<thrust::detail::uint8_t, Derived> tmp{
policy,
tmp_size};
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
num_items,
(tmp.data().get(),
tmp_size,
first,
result,
scan_op,
InputValueT(init),
num_items_fixed,
stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(status,
"after dispatching exclusive_scan kernel");
thrust::cuda_cub::throw_on_error(thrust::cuda_cub::synchronize_optional(policy),
"exclusive_scan failed to synchronize");
}
return result + num_items;
}
} // namespace detail
//-------------------------
// Thrust API entry points
//-------------------------
__thrust_exec_check_disable__
template <typename Derived,
typename InputIt,
typename Size,
typename OutputIt,
typename ScanOp>
__host__ __device__
OutputIt inclusive_scan_n(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
Size num_items,
OutputIt result,
ScanOp scan_op)
{
OutputIt ret = result;
if (__THRUST_HAS_CUDART__)
{
ret = thrust::cuda_cub::detail::inclusive_scan_n_impl(policy,
first,
num_items,
result,
scan_op);
}
else
{
#if !__THRUST_HAS_CUDART__
ret = thrust::inclusive_scan(cvt_to_seq(derived_cast(policy)),
first,
first + num_items,
result,
scan_op);
#endif
}
return ret;
}
template <typename Derived, typename InputIt, typename OutputIt, typename ScanOp>
__host__ __device__
OutputIt inclusive_scan(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
InputIt last,
OutputIt result,
ScanOp scan_op)
{
using diff_t = typename thrust::iterator_traits<InputIt>::difference_type;
diff_t const num_items = thrust::distance(first, last);
return thrust::cuda_cub::inclusive_scan_n(policy,
first,
num_items,
result,
scan_op);
}
template <typename Derived, typename InputIt, typename OutputIt>
__host__ __device__
OutputIt inclusive_scan(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
InputIt last,
OutputIt result)
{
return thrust::cuda_cub::inclusive_scan(policy,
first,
last,
result,
thrust::plus<>{});
}
__thrust_exec_check_disable__
template <typename Derived,
typename InputIt,
typename Size,
typename OutputIt,
typename T,
typename ScanOp>
__host__ __device__
OutputIt exclusive_scan_n(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
Size num_items,
OutputIt result,
T init,
ScanOp scan_op)
{
OutputIt ret = result;
if (__THRUST_HAS_CUDART__)
{
ret = thrust::cuda_cub::detail::exclusive_scan_n_impl(policy,
first,
num_items,
result,
init,
scan_op);
}
else
{
#if !__THRUST_HAS_CUDART__
ret = thrust::exclusive_scan(cvt_to_seq(derived_cast(policy)),
first,
first + num_items,
result,
init,
scan_op);
#endif
}
return ret;
}
template <typename Derived,
typename InputIt,
typename OutputIt,
typename T,
typename ScanOp>
__host__ __device__
OutputIt exclusive_scan(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
InputIt last,
OutputIt result,
T init,
ScanOp scan_op)
{
using diff_t = typename thrust::iterator_traits<InputIt>::difference_type;
diff_t const num_items = thrust::distance(first, last);
return thrust::cuda_cub::exclusive_scan_n(policy,
first,
num_items,
result,
init,
scan_op);
}
template <typename Derived, typename InputIt, typename OutputIt, typename T>
__host__ __device__
OutputIt exclusive_scan(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
InputIt last,
OutputIt result,
T init)
{
return thrust::cuda_cub::exclusive_scan(policy,
first,
last,
result,
init,
thrust::plus<>{});
}
template <typename Derived, typename InputIt, typename OutputIt>
__host__ __device__
OutputIt exclusive_scan(thrust::cuda_cub::execution_policy<Derived> &policy,
InputIt first,
InputIt last,
OutputIt result)
{
using init_type = typename thrust::iterator_traits<InputIt>::value_type;
return cuda_cub::exclusive_scan(policy, first, last, result, init_type{});
};
} // namespace cuda_cub
THRUST_NAMESPACE_END
#include <thrust/scan.h>
#endif // NVCC
|
