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
|
/******************************************************************************
* 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/system/cuda/detail/execution_policy.h>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub {
template <class Derived, class ItemsIt, class ResultIt>
ResultIt __host__ __device__
reverse_copy(execution_policy<Derived> &policy,
ItemsIt first,
ItemsIt last,
ResultIt result);
template <class Derived, class ItemsIt>
void __host__ __device__
reverse(execution_policy<Derived> &policy,
ItemsIt first,
ItemsIt last);
} // namespace cuda_cub
THRUST_NAMESPACE_END
#include <thrust/advance.h>
#include <thrust/distance.h>
#include <thrust/system/cuda/detail/swap_ranges.h>
#include <thrust/system/cuda/detail/copy.h>
#include <thrust/iterator/reverse_iterator.h>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub {
template <class Derived,
class ItemsIt,
class ResultIt>
ResultIt __host__ __device__
reverse_copy(execution_policy<Derived> &policy,
ItemsIt first,
ItemsIt last,
ResultIt result)
{
return cuda_cub::copy(policy,
thrust::make_reverse_iterator(last),
thrust::make_reverse_iterator(first),
result);
}
template <class Derived,
class ItemsIt>
void __host__ __device__
reverse(execution_policy<Derived> &policy,
ItemsIt first,
ItemsIt last)
{
typedef typename thrust::iterator_difference<ItemsIt>::type difference_type;
// find the midpoint of [first,last)
difference_type N = thrust::distance(first, last);
ItemsIt mid(first);
thrust::advance(mid, N / 2);
cuda_cub::swap_ranges(policy, first, mid, thrust::make_reverse_iterator(last));
}
} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif
|
