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/******************************************************************************
* Copyright (c) 2020, 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>
#include <thrust/detail/cpp14_required.h>
#if THRUST_CPP_DIALECT >= 2014
#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
#include <thrust/iterator/iterator_traits.h>
#include <thrust/system/cuda/config.h>
#include <thrust/system/cuda/detail/async/customization.h>
#include <thrust/system/cuda/detail/util.h>
#include <thrust/system/cuda/future.h>
#include <thrust/type_traits/remove_cvref.h>
#include <thrust/distance.h>
#include <type_traits>
// TODO specialize for thrust::plus to use e.g. ExclusiveSum instead of ExcScan
// - Note that thrust::plus<> is transparent, cub::Sum is not. This should be
// fixed in CUB first).
// - Need to check if CUB actually optimizes for sums before putting in effort
THRUST_NAMESPACE_BEGIN
namespace system
{
namespace cuda
{
namespace detail
{
template <typename DerivedPolicy,
typename ForwardIt,
typename Size,
typename OutputIt,
typename InitialValueType,
typename BinaryOp>
unique_eager_event
async_exclusive_scan_n(execution_policy<DerivedPolicy>& policy,
ForwardIt first,
Size n,
OutputIt out,
InitialValueType init,
BinaryOp op)
{
using InputValueT = cub::detail::InputValue<InitialValueType>;
using Dispatch32 = cub::DispatchScan<ForwardIt,
OutputIt,
BinaryOp,
InputValueT,
thrust::detail::int32_t>;
using Dispatch64 = cub::DispatchScan<ForwardIt,
OutputIt,
BinaryOp,
InputValueT,
thrust::detail::int64_t>;
InputValueT init_value(init);
auto const device_alloc = get_async_device_allocator(policy);
unique_eager_event ev;
// Determine temporary device storage requirements.
cudaError_t status;
size_t tmp_size = 0;
{
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
n,
(nullptr,
tmp_size,
first,
out,
op,
init_value,
n_fixed,
nullptr,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(status,
"after determining tmp storage "
"requirements for exclusive_scan");
}
// Allocate temporary storage.
auto content = uninitialized_allocate_unique_n<thrust::detail::uint8_t>(
device_alloc, tmp_size
);
void* const tmp_ptr = raw_pointer_cast(content.get());
// Set up stream with dependencies.
cudaStream_t const user_raw_stream = thrust::cuda_cub::stream(policy);
if (thrust::cuda_cub::default_stream() != user_raw_stream)
{
ev = make_dependent_event(
std::tuple_cat(
std::make_tuple(
std::move(content),
unique_stream(nonowning, user_raw_stream)
),
extract_dependencies(std::move(thrust::detail::derived_cast(policy)))));
}
else
{
ev = make_dependent_event(
std::tuple_cat(
std::make_tuple(std::move(content)),
extract_dependencies(std::move(thrust::detail::derived_cast(policy)))));
}
// Run scan.
{
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
n,
(tmp_ptr,
tmp_size,
first,
out,
op,
init_value,
n_fixed,
user_raw_stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(status,
"after dispatching exclusive_scan kernel");
}
return ev;
}
}}} // namespace system::cuda::detail
namespace cuda_cub
{
// ADL entry point.
template <typename DerivedPolicy,
typename ForwardIt,
typename Sentinel,
typename OutputIt,
typename InitialValueType,
typename BinaryOp>
auto async_exclusive_scan(execution_policy<DerivedPolicy>& policy,
ForwardIt first,
Sentinel&& last,
OutputIt&& out,
InitialValueType &&init,
BinaryOp&& op)
THRUST_RETURNS(
thrust::system::cuda::detail::async_exclusive_scan_n(
policy,
first,
distance(first, THRUST_FWD(last)),
THRUST_FWD(out),
THRUST_FWD(init),
THRUST_FWD(op)
)
)
} // namespace cuda_cub
THRUST_NAMESPACE_END
#endif // THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_NVCC
#endif // C++14
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