QUDA: quda/include/externals/trove/detail/fallback.h Source File

QUDA  v1.1.0
A library for QCD on GPUs
fallback.h
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1 /*
2 Copyright (c) 2013, NVIDIA Corporation
3 All rights reserved.
4 
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions are met:
7  * Redistributions of source code must retain the above copyright
8  notice, this list of conditions and the following disclaimer.
9  * Redistributions in binary form must reproduce the above copyright
10  notice, this list of conditions and the following disclaimer in the
11  documentation and/or other materials provided with the distribution.
12  * Neither the name of the <organization> nor the
13  names of its contributors may be used to endorse or promote products
14  derived from this software without specific prior written permission.
15 
16 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
17 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
20 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27 
28 #pragma once
29 #include <trove/utility.h>
30 #include <trove/detail/dismember.h>
31 
32 namespace trove {
33 namespace detail {
34 
35 template<int s, typename T>
36  struct divergent_loader {
37   typedef typename detail::dismember_type<T>::type U;
38  __device__
39   static array<U, s> impl(const U* src) {
40  return array<U, s>(*src,
41  divergent_loader<s-1, T>::impl(src+1));
42  }
43  __device__
44   static array<U, s> impl(const T* src) {
45  return impl((U*)src);
46  }
47 };
48 
49 template<typename T>
50  struct divergent_loader<1, T> {
51   typedef typename detail::dismember_type<T>::type U;
52  __device__
53   static array<U, 1> impl(const U* src) {
54  return array<U, 1>(*src);
55  }
56  __device__
57   static array<U, 1> impl(const T* src) {
58  return impl((U*)src);
59  }
60 };
61 
62 template<typename T>
63  struct use_divergent {
64   static const bool value = (sizeof(T) % 4) == 0;
65 };
66 
67 template<typename T>
68 __device__
69 typename enable_if<use_divergent<T>::value, T>::type
70  divergent_load(const T* src) {
71  typedef typename detail::dismember_type<T>::type U;
72  typedef array<U, detail::aliased_size<T, U>::value> u_store;
73  u_store loaded =
74  detail::divergent_loader<detail::aliased_size<T, U>::value, T>::impl(
75  src);
76  return detail::fuse<T>(loaded);
77 }
78 
79 template<typename T>
80 __device__
81 typename enable_if<!use_divergent<T>::value, T>::type
82  divergent_load(const T* src) {
83  return *src;
84 }
85 
86 template<int s, typename T>
87  struct divergent_storer {
88   typedef typename detail::dismember_type<T>::type U;
89  __device__
90   static void impl(const array<U, s>& data, U* dest) {
91  *dest = data.head;
92  divergent_storer<s-1, T>::impl(data.tail, dest+1);
93  }
94  __device__
95   static void impl(const array<U, s>& data, const T* dest) {
96  return impl(data, (U*)dest);
97  }
98 };
99 
100 template<typename T>
101  struct divergent_storer<1, T> {
102   typedef typename detail::dismember_type<T>::type U;
103  __device__
104   static void impl(const array<U, 1>& data, U* dest) {
105  *dest = data.head;
106  }
107  __device__
108   static void impl(const array<U, 1>& data, const T* dest) {
109  return impl(data, (U*)dest);
110  }
111 };
112 
113 template<typename T>
114 __device__
115 typename enable_if<use_divergent<T>::value>::type
116  divergent_store(const T& data, T* dest) {
117  typedef typename detail::dismember_type<T>::type U;
118  typedef array<U, detail::aliased_size<T, U>::value> u_store;
119  u_store lysed = detail::lyse<U>(data);
120  detail::divergent_storer<detail::aliased_size<T, U>::value, T>::impl(
121  lysed, dest);
122 }
123 
124 template<typename T>
125 __device__
126 typename enable_if<!use_divergent<T>::value>::type
127  divergent_store(const T& data, T* dest) {
128  *dest = data;
129 }
130 
131 
132 }
133 }
detail
Definition: alias.h:4
trove::detail::divergent_load
__device__ enable_if< use_divergent< T >::value, T >::type divergent_load(const T *src)
Definition: fallback.h:70
trove::detail::divergent_store
__device__ enable_if< use_divergent< T >::value >::type divergent_store(const T &data, T *dest)
Definition: fallback.h:116
trove
Definition: aos.h:38
trove::array::head
head_type head
Definition: array.h:38
trove::array::tail
tail_type tail
Definition: array.h:39
trove::detail::divergent_loader< 1, T >::impl
static __device__ array< U, 1 > impl(const U *src)
Definition: fallback.h:53
trove::detail::divergent_loader< 1, T >::impl
static __device__ array< U, 1 > impl(const T *src)
Definition: fallback.h:57
trove::detail::divergent_loader< 1, T >::U
detail::dismember_type< T >::type U
Definition: fallback.h:51
trove::detail::divergent_loader::impl
static __device__ array< U, s > impl(const U *src)
Definition: fallback.h:39
trove::detail::divergent_loader::U
detail::dismember_type< T >::type U
Definition: fallback.h:37
trove::detail::divergent_loader::impl
static __device__ array< U, s > impl(const T *src)
Definition: fallback.h:44
trove::detail::divergent_storer< 1, T >::impl
static __device__ void impl(const array< U, 1 > &data, U *dest)
Definition: fallback.h:104
trove::detail::divergent_storer< 1, T >::impl
static __device__ void impl(const array< U, 1 > &data, const T *dest)
Definition: fallback.h:108
trove::detail::divergent_storer< 1, T >::U
detail::dismember_type< T >::type U
Definition: fallback.h:102
trove::detail::divergent_storer::impl
static __device__ void impl(const array< U, s > &data, U *dest)
Definition: fallback.h:90
trove::detail::divergent_storer::U
detail::dismember_type< T >::type U
Definition: fallback.h:88
trove::detail::divergent_storer::impl
static __device__ void impl(const array< U, s > &data, const T *dest)
Definition: fallback.h:95
trove::detail::use_divergent::value
static const bool value
Definition: fallback.h:64

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