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
|
/*
* Copyright 2008-2013 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/detail/allocator/allocator_traits.h>
#include <thrust/detail/type_traits/pointer_traits.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/detail/copy.h>
#include <thrust/tuple.h>
#include <thrust/advance.h>
#include <thrust/distance.h>
#include <thrust/iterator/zip_iterator.h>
#include <thrust/for_each.h>
#include <thrust/detail/memory_wrapper.h>
THRUST_NAMESPACE_BEGIN
namespace detail
{
namespace allocator_traits_detail
{
template<typename Allocator, typename InputType, typename OutputType>
struct copy_construct_with_allocator
{
Allocator &a;
__host__ __device__
copy_construct_with_allocator(Allocator &a)
: a(a)
{}
template<typename Tuple>
inline __host__ __device__
void operator()(Tuple t)
{
const InputType &in = thrust::get<0>(t);
OutputType &out = thrust::get<1>(t);
allocator_traits<Allocator>::construct(a, &out, in);
}
};
// we need to use allocator_traits<Allocator>::construct() to
// copy construct a T if either:
// 1. Allocator has a 2-argument construct() member or
// 2. T has a non-trivial copy constructor
template<typename Allocator, typename T>
struct needs_copy_construct_via_allocator
: integral_constant<
bool,
(has_member_construct2<Allocator,T,T>::value || !has_trivial_copy_constructor<T>::value)
>
{};
// we know that std::allocator::construct's only effect is to call T's
// copy constructor, so we needn't consider or use its construct() member for copy construction
template<typename U, typename T>
struct needs_copy_construct_via_allocator<std::allocator<U>, T>
: integral_constant<
bool,
!has_trivial_copy_constructor<T>::value
>
{};
// XXX it's regrettable that this implementation is copied almost
// exactly from system::detail::generic::uninitialized_copy
// perhaps generic::uninitialized_copy could call this routine
// with a default allocator
template<typename Allocator, typename FromSystem, typename ToSystem, typename InputIterator, typename Pointer>
__host__ __device__
typename enable_if_convertible<
FromSystem,
ToSystem,
Pointer
>::type
uninitialized_copy_with_allocator(Allocator &a,
const thrust::execution_policy<FromSystem> &,
const thrust::execution_policy<ToSystem> &to_system,
InputIterator first,
InputIterator last,
Pointer result)
{
// zip up the iterators
typedef thrust::tuple<InputIterator,Pointer> IteratorTuple;
typedef thrust::zip_iterator<IteratorTuple> ZipIterator;
ZipIterator begin = thrust::make_zip_iterator(thrust::make_tuple(first,result));
ZipIterator end = begin;
// get a zip_iterator pointing to the end
const typename thrust::iterator_difference<InputIterator>::type n = thrust::distance(first,last);
thrust::advance(end,n);
// create a functor
typedef typename iterator_traits<InputIterator>::value_type InputType;
typedef typename iterator_traits<Pointer>::value_type OutputType;
// do the for_each
// note we use to_system to dispatch the for_each
thrust::for_each(to_system, begin, end, copy_construct_with_allocator<Allocator,InputType,OutputType>(a));
// return the end of the output range
return thrust::get<1>(end.get_iterator_tuple());
}
// XXX it's regrettable that this implementation is copied almost
// exactly from system::detail::generic::uninitialized_copy_n
// perhaps generic::uninitialized_copy_n could call this routine
// with a default allocator
template<typename Allocator, typename FromSystem, typename ToSystem, typename InputIterator, typename Size, typename Pointer>
__host__ __device__
typename enable_if_convertible<
FromSystem,
ToSystem,
Pointer
>::type
uninitialized_copy_with_allocator_n(Allocator &a,
const thrust::execution_policy<FromSystem> &,
const thrust::execution_policy<ToSystem> &to_system,
InputIterator first,
Size n,
Pointer result)
{
// zip up the iterators
typedef thrust::tuple<InputIterator,Pointer> IteratorTuple;
typedef thrust::zip_iterator<IteratorTuple> ZipIterator;
ZipIterator begin = thrust::make_zip_iterator(thrust::make_tuple(first,result));
// create a functor
typedef typename iterator_traits<InputIterator>::value_type InputType;
typedef typename iterator_traits<Pointer>::value_type OutputType;
// do the for_each_n
// note we use to_system to dispatch the for_each_n
ZipIterator end = thrust::for_each_n(to_system, begin, n, copy_construct_with_allocator<Allocator,InputType,OutputType>(a));
// return the end of the output range
return thrust::get<1>(end.get_iterator_tuple());
}
template<typename Allocator, typename FromSystem, typename ToSystem, typename InputIterator, typename Pointer>
__host__ __device__
typename disable_if_convertible<
FromSystem,
ToSystem,
Pointer
>::type
uninitialized_copy_with_allocator(Allocator &,
const thrust::execution_policy<FromSystem> &from_system,
const thrust::execution_policy<ToSystem> &to_system,
InputIterator first,
InputIterator last,
Pointer result)
{
// the systems aren't trivially interoperable
// just call two_system_copy and hope for the best
return thrust::detail::two_system_copy(from_system, to_system, first, last, result);
} // end uninitialized_copy_with_allocator()
template<typename Allocator, typename FromSystem, typename ToSystem, typename InputIterator, typename Size, typename Pointer>
__host__ __device__
typename disable_if_convertible<
FromSystem,
ToSystem,
Pointer
>::type
uninitialized_copy_with_allocator_n(Allocator &,
const thrust::execution_policy<FromSystem> &from_system,
const thrust::execution_policy<ToSystem> &to_system,
InputIterator first,
Size n,
Pointer result)
{
// the systems aren't trivially interoperable
// just call two_system_copy_n and hope for the best
return thrust::detail::two_system_copy_n(from_system, to_system, first, n, result);
} // end uninitialized_copy_with_allocator_n()
template<typename FromSystem, typename Allocator, typename InputIterator, typename Pointer>
__host__ __device__
typename disable_if<
needs_copy_construct_via_allocator<
Allocator,
typename pointer_element<Pointer>::type
>::value,
Pointer
>::type
copy_construct_range(thrust::execution_policy<FromSystem> &from_system,
Allocator &a,
InputIterator first,
InputIterator last,
Pointer result)
{
// just call two_system_copy
return thrust::detail::two_system_copy(from_system, allocator_system<Allocator>::get(a), first, last, result);
}
template<typename FromSystem, typename Allocator, typename InputIterator, typename Size, typename Pointer>
__host__ __device__
typename disable_if<
needs_copy_construct_via_allocator<
Allocator,
typename pointer_element<Pointer>::type
>::value,
Pointer
>::type
copy_construct_range_n(thrust::execution_policy<FromSystem> &from_system,
Allocator &a,
InputIterator first,
Size n,
Pointer result)
{
// just call two_system_copy_n
return thrust::detail::two_system_copy_n(from_system, allocator_system<Allocator>::get(a), first, n, result);
}
template<typename FromSystem, typename Allocator, typename InputIterator, typename Pointer>
__host__ __device__
typename enable_if<
needs_copy_construct_via_allocator<
Allocator,
typename pointer_element<Pointer>::type
>::value,
Pointer
>::type
copy_construct_range(thrust::execution_policy<FromSystem> &from_system,
Allocator &a,
InputIterator first,
InputIterator last,
Pointer result)
{
return uninitialized_copy_with_allocator(a, from_system, allocator_system<Allocator>::get(a), first, last, result);
}
template<typename FromSystem, typename Allocator, typename InputIterator, typename Size, typename Pointer>
__host__ __device__
typename enable_if<
needs_copy_construct_via_allocator<
Allocator,
typename pointer_element<Pointer>::type
>::value,
Pointer
>::type
copy_construct_range_n(thrust::execution_policy<FromSystem> &from_system,
Allocator &a,
InputIterator first,
Size n,
Pointer result)
{
return uninitialized_copy_with_allocator_n(a, from_system, allocator_system<Allocator>::get(a), first, n, result);
}
} // end allocator_traits_detail
template<typename System, typename Allocator, typename InputIterator, typename Pointer>
__host__ __device__
Pointer copy_construct_range(thrust::execution_policy<System> &from_system,
Allocator &a,
InputIterator first,
InputIterator last,
Pointer result)
{
return allocator_traits_detail::copy_construct_range(from_system, a, first, last, result);
}
template<typename System, typename Allocator, typename InputIterator, typename Size, typename Pointer>
__host__ __device__
Pointer copy_construct_range_n(thrust::execution_policy<System> &from_system,
Allocator &a,
InputIterator first,
Size n,
Pointer result)
{
return allocator_traits_detail::copy_construct_range_n(from_system, a, first, n, result);
}
} // end detail
THRUST_NAMESPACE_END
|
