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/*
* 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.
*/
// TODO: This can probably be removed.
#pragma once
#include <thrust/detail/config.h>
#include <thrust/system/cuda/detail/util.h>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub {
namespace alignment_of_detail {
template <typename T>
class alignment_of_impl;
template <typename T, std::size_t size_diff>
struct helper
{
static const std::size_t value = size_diff;
};
template <typename T>
class helper<T, 0>
{
public:
static const std::size_t value = alignment_of_impl<T>::value;
};
template <typename T>
class alignment_of_impl
{
private:
struct big
{
T x;
char c;
};
public:
static const std::size_t value = helper<big, sizeof(big) - sizeof(T)>::value;
};
} // end alignment_of_detail
template <typename T>
struct alignment_of
: alignment_of_detail::alignment_of_impl<T>
{
};
template <std::size_t Align>
struct aligned_type;
// __align__ is CUDA-specific, so guard it
#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
// implementing aligned_type portably is tricky:
#if THRUST_HOST_COMPILER == THRUST_HOST_COMPILER_MSVC
// implement aligned_type with specialization because MSVC
// requires literals as arguments to declspec(align(n))
template <>
struct aligned_type<1>
{
struct __align__(1) type{};
};
template <>
struct aligned_type<2>
{
struct __align__(2) type{};
};
template <>
struct aligned_type<4>
{
struct __align__(4) type{};
};
template <>
struct aligned_type<8>
{
struct __align__(8) type{};
};
template <>
struct aligned_type<16>
{
struct __align__(16) type{};
};
template <>
struct aligned_type<32>
{
struct __align__(32) type{};
};
template <>
struct aligned_type<64>
{
struct __align__(64) type{};
};
template <>
struct aligned_type<128>
{
struct __align__(128) type{};
};
template <>
struct aligned_type<256>
{
struct __align__(256) type{};
};
template <>
struct aligned_type<512>
{
struct __align__(512) type{};
};
template <>
struct aligned_type<1024>
{
struct __align__(1024) type{};
};
template <>
struct aligned_type<2048>
{
struct __align__(2048) type{};
};
template <>
struct aligned_type<4096>
{
struct __align__(4096) type{};
};
template <>
struct aligned_type<8192>
{
struct __align__(8192) type{};
};
#elif (THRUST_HOST_COMPILER == THRUST_HOST_COMPILER_GCC) && (THRUST_GCC_VERSION < 40300)
// implement aligned_type with specialization because gcc 4.2
// requires literals as arguments to __attribute__(aligned(n))
template <>
struct aligned_type<1>
{
struct __align__(1) type{};
};
template <>
struct aligned_type<2>
{
struct __align__(2) type{};
};
template <>
struct aligned_type<4>
{
struct __align__(4) type{};
};
template <>
struct aligned_type<8>
{
struct __align__(8) type{};
};
template <>
struct aligned_type<16>
{
struct __align__(16) type{};
};
template <>
struct aligned_type<32>
{
struct __align__(32) type{};
};
template <>
struct aligned_type<64>
{
struct __align__(64) type{};
};
template <>
struct aligned_type<128>
{
struct __align__(128) type{};
};
#else
// assume the compiler allows template parameters as
// arguments to __align__
template <std::size_t Align>
struct aligned_type
{
struct __align__(Align) type{};
};
#endif // THRUST_HOST_COMPILER
#else
template <std::size_t Align>
struct aligned_type
{
struct type
{
};
};
#endif // THRUST_DEVICE_COMPILER
template <std::size_t Len, std::size_t Align>
struct aligned_storage
{
union type
{
unsigned char data[Len];
typename aligned_type<Align>::type align;
};
};
} // end cuda_
THRUST_NAMESPACE_END
|
