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/******************************************************************************
* 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 <iterator>
#include <thrust/system/cuda/detail/transform.h>
#include <thrust/system/cuda/detail/par_to_seq.h>
#include <thrust/swap.h>
#include <thrust/system/cuda/detail/parallel_for.h>
#include <thrust/distance.h>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub {
namespace __swap_ranges {
template <class ItemsIt1, class ItemsIt2>
struct swap_f
{
ItemsIt1 items1;
ItemsIt2 items2;
typedef typename iterator_traits<ItemsIt1>::value_type value1_type;
typedef typename iterator_traits<ItemsIt2>::value_type value2_type;
THRUST_FUNCTION
swap_f(ItemsIt1 items1_, ItemsIt2 items2_)
: items1(items1_), items2(items2_) {}
template<class Size>
void THRUST_DEVICE_FUNCTION operator()(Size idx)
{
value1_type item1 = items1[idx];
value2_type item2 = items2[idx];
// XXX thrust::swap is buggy
// if reference_type of ItemIt1/ItemsIt2
// is a proxy reference, then KABOOM!
// to avoid this, just copy the value first before swap
// *todo* specialize on real & proxy references
using thrust::swap;
swap(item1, item2);
items1[idx] = item1;
items2[idx] = item2;
}
};
} // namespace __swap_ranges
template <class Derived,
class ItemsIt1,
class ItemsIt2>
ItemsIt2 __host__ __device__
swap_ranges(execution_policy<Derived> &policy,
ItemsIt1 first1,
ItemsIt1 last1,
ItemsIt2 first2)
{
typedef typename iterator_traits<ItemsIt1>::difference_type size_type;
size_type num_items = static_cast<size_type>(thrust::distance(first1, last1));
cuda_cub::parallel_for(policy,
__swap_ranges::swap_f<ItemsIt1,
ItemsIt2>(first1, first2),
num_items);
cuda_cub::throw_on_error(
cuda_cub::synchronize_optional(policy)
, "swap_ranges: failed to synchronize"
);
return first2 + num_items;
}
} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif
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