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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/distance.h>
#include <thrust/system/cuda/detail/execution_policy.h>
#include <thrust/system/cuda/detail/util.h>
#include <thrust/system/cuda/detail/parallel_for.h>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub {
namespace __uninitialized_copy {
template <class InputIt, class OutputIt>
struct functor
{
InputIt input;
OutputIt output;
typedef typename iterator_traits<InputIt>::value_type InputType;
typedef typename iterator_traits<OutputIt>::value_type OutputType;
THRUST_FUNCTION
functor(InputIt input_, OutputIt output_)
: input(input_), output(output_) {}
template<class Size>
void THRUST_DEVICE_FUNCTION operator()(Size idx)
{
InputType const &in = raw_reference_cast(input[idx]);
OutputType & out = raw_reference_cast(output[idx]);
#if defined(__CUDA__) && defined(__clang__)
// XXX unsafe, but clang is seemngly unable to call in-place new
out = in;
#else
::new (static_cast<void *>(&out)) OutputType(in);
#endif
}
}; // struct functor
} // namespace __uninitialized_copy
template <class Derived,
class InputIt,
class Size,
class OutputIt>
OutputIt __host__ __device__
uninitialized_copy_n(execution_policy<Derived> &policy,
InputIt first,
Size count,
OutputIt result)
{
typedef __uninitialized_copy::functor<InputIt,OutputIt> functor_t;
cuda_cub::parallel_for(policy,
functor_t(first, result),
count);
cuda_cub::throw_on_error(
cuda_cub::synchronize_optional(policy)
, "uninitialized_copy_n: failed to synchronize"
);
return result + count;
}
template <class Derived,
class InputIt,
class OutputIt>
OutputIt __host__ __device__
uninitialized_copy(execution_policy<Derived>& policy,
InputIt first,
InputIt last,
OutputIt result)
{
return cuda_cub::uninitialized_copy_n(policy,
first,
thrust::distance(first, last),
result);
}
} // namespace cuda_
THRUST_NAMESPACE_END
#endif
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