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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 <thrust/distance.h>
#include <thrust/functional.h>
#include <thrust/type_traits/is_contiguous_iterator.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/detail/cstdint.h>
#include <thrust/detail/temporary_array.h>
#include <thrust/system/cuda/config.h>
#include <thrust/system/cuda/detail/dispatch.h>
#include <thrust/system/cuda/detail/par_to_seq.h>
#include <thrust/system/cuda/detail/util.h>
#include <cub/device/dispatch/dispatch_scan_by_key.cuh>
#include <cub/util_type.cuh>
THRUST_NAMESPACE_BEGIN
namespace cuda_cub
{
namespace detail
{
__thrust_exec_check_disable__
template <typename Derived,
typename KeysInIt,
typename ValuesInIt,
typename ValuesOutIt,
typename EqualityOpT,
typename ScanOpT,
typename SizeT>
__host__ __device__
ValuesOutIt inclusive_scan_by_key_n(
thrust::cuda_cub::execution_policy<Derived>& policy,
KeysInIt keys,
ValuesInIt values,
ValuesOutIt result,
SizeT num_items,
EqualityOpT equality_op,
ScanOpT scan_op)
{
if (num_items == 0)
{
return result;
}
// Convert to raw pointers if possible:
using KeysInUnwrapIt =
thrust::detail::try_unwrap_contiguous_iterator_return_t<KeysInIt>;
using ValuesInUnwrapIt =
thrust::detail::try_unwrap_contiguous_iterator_return_t<ValuesInIt>;
using ValuesOutUnwrapIt =
thrust::detail::try_unwrap_contiguous_iterator_return_t<ValuesOutIt>;
auto keys_unwrap = thrust::detail::try_unwrap_contiguous_iterator(keys);
auto values_unwrap = thrust::detail::try_unwrap_contiguous_iterator(values);
auto result_unwrap = thrust::detail::try_unwrap_contiguous_iterator(result);
using Dispatch32 = cub::DispatchScanByKey<KeysInUnwrapIt,
ValuesInUnwrapIt,
ValuesOutUnwrapIt,
EqualityOpT,
ScanOpT,
cub::NullType,
thrust::detail::int32_t>;
using Dispatch64 = cub::DispatchScanByKey<KeysInUnwrapIt,
ValuesInUnwrapIt,
ValuesOutUnwrapIt,
EqualityOpT,
ScanOpT,
cub::NullType,
thrust::detail::int64_t>;
cudaStream_t stream = thrust::cuda_cub::stream(policy);
cudaError_t status{};
// Determine temporary storage requirements:
std::size_t tmp_size = 0;
{
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
num_items,
(nullptr,
tmp_size,
keys_unwrap,
values_unwrap,
result_unwrap,
equality_op,
scan_op,
cub::NullType{},
num_items_fixed,
stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(status,
"after determining tmp storage "
"requirements for inclusive_scan_by_key");
}
// Run scan:
{
// Allocate temporary storage:
thrust::detail::temporary_array<thrust::detail::uint8_t, Derived> tmp{
policy,
tmp_size};
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
num_items,
(tmp.data().get(),
tmp_size,
keys_unwrap,
values_unwrap,
result_unwrap,
equality_op,
scan_op,
cub::NullType{},
num_items_fixed,
stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(
status, "after dispatching inclusive_scan_by_key kernel");
thrust::cuda_cub::throw_on_error(
thrust::cuda_cub::synchronize_optional(policy),
"inclusive_scan_by_key failed to synchronize");
}
return result + num_items;
}
__thrust_exec_check_disable__
template <typename Derived,
typename KeysInIt,
typename ValuesInIt,
typename ValuesOutIt,
typename InitValueT,
typename EqualityOpT,
typename ScanOpT,
typename SizeT>
__host__ __device__
ValuesOutIt exclusive_scan_by_key_n(
thrust::cuda_cub::execution_policy<Derived>& policy,
KeysInIt keys,
ValuesInIt values,
ValuesOutIt result,
SizeT num_items,
InitValueT init_value,
EqualityOpT equality_op,
ScanOpT scan_op)
{
if (num_items == 0)
{
return result;
}
// Convert to raw pointers if possible:
using KeysInUnwrapIt =
thrust::detail::try_unwrap_contiguous_iterator_return_t<KeysInIt>;
using ValuesInUnwrapIt =
thrust::detail::try_unwrap_contiguous_iterator_return_t<ValuesInIt>;
using ValuesOutUnwrapIt =
thrust::detail::try_unwrap_contiguous_iterator_return_t<ValuesOutIt>;
auto keys_unwrap = thrust::detail::try_unwrap_contiguous_iterator(keys);
auto values_unwrap = thrust::detail::try_unwrap_contiguous_iterator(values);
auto result_unwrap = thrust::detail::try_unwrap_contiguous_iterator(result);
using Dispatch32 = cub::DispatchScanByKey<KeysInUnwrapIt,
ValuesInUnwrapIt,
ValuesOutUnwrapIt,
EqualityOpT,
ScanOpT,
InitValueT,
thrust::detail::int32_t>;
using Dispatch64 = cub::DispatchScanByKey<KeysInUnwrapIt,
ValuesInUnwrapIt,
ValuesOutUnwrapIt,
EqualityOpT,
ScanOpT,
InitValueT,
thrust::detail::int64_t>;
cudaStream_t stream = thrust::cuda_cub::stream(policy);
cudaError_t status{};
// Determine temporary storage requirements:
std::size_t tmp_size = 0;
{
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
num_items,
(nullptr,
tmp_size,
keys_unwrap,
values_unwrap,
result_unwrap,
equality_op,
scan_op,
init_value,
num_items_fixed,
stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(status,
"after determining tmp storage "
"requirements for exclusive_scan_by_key");
}
// Run scan:
{
// Allocate temporary storage:
thrust::detail::temporary_array<thrust::detail::uint8_t, Derived> tmp{
policy,
tmp_size};
THRUST_INDEX_TYPE_DISPATCH2(status,
Dispatch32::Dispatch,
Dispatch64::Dispatch,
num_items,
(tmp.data().get(),
tmp_size,
keys_unwrap,
values_unwrap,
result_unwrap,
equality_op,
scan_op,
init_value,
num_items_fixed,
stream,
THRUST_DEBUG_SYNC_FLAG));
thrust::cuda_cub::throw_on_error(
status, "after dispatching exclusive_scan_by_key kernel");
thrust::cuda_cub::throw_on_error(
thrust::cuda_cub::synchronize_optional(policy),
"exclusive_scan_by_key failed to synchronize");
}
return result + num_items;
}
} // namespace detail
//-------------------------
// Thrust API entry points
//-------------------------
//---------------------------
// Inclusive scan
//---------------------------
__thrust_exec_check_disable__
template <class Derived,
class KeyInputIt,
class ValInputIt,
class ValOutputIt,
class BinaryPred,
class ScanOp>
ValOutputIt __host__ __device__
inclusive_scan_by_key(execution_policy<Derived> &policy,
KeyInputIt key_first,
KeyInputIt key_last,
ValInputIt value_first,
ValOutputIt value_result,
BinaryPred binary_pred,
ScanOp scan_op)
{
ValOutputIt ret = value_result;
if (__THRUST_HAS_CUDART__)
{
ret = thrust::cuda_cub::detail::inclusive_scan_by_key_n(
policy,
key_first,
value_first,
value_result,
thrust::distance(key_first, key_last),
binary_pred,
scan_op);
}
else
{
#if !__THRUST_HAS_CUDART__
ret = thrust::inclusive_scan_by_key(cvt_to_seq(derived_cast(policy)),
key_first,
key_last,
value_first,
value_result,
binary_pred,
scan_op);
#endif
}
return ret;
}
template <class Derived,
class KeyInputIt,
class ValInputIt,
class ValOutputIt,
class BinaryPred>
ValOutputIt __host__ __device__
inclusive_scan_by_key(execution_policy<Derived> &policy,
KeyInputIt key_first,
KeyInputIt key_last,
ValInputIt value_first,
ValOutputIt value_result,
BinaryPred binary_pred)
{
return cuda_cub::inclusive_scan_by_key(policy,
key_first,
key_last,
value_first,
value_result,
binary_pred,
thrust::plus<>());
}
template <class Derived,
class KeyInputIt,
class ValInputIt,
class ValOutputIt>
ValOutputIt __host__ __device__
inclusive_scan_by_key(execution_policy<Derived> &policy,
KeyInputIt key_first,
KeyInputIt key_last,
ValInputIt value_first,
ValOutputIt value_result)
{
return cuda_cub::inclusive_scan_by_key(policy,
key_first,
key_last,
value_first,
value_result,
thrust::equal_to<>());
}
//---------------------------
// Exclusive scan
//---------------------------
__thrust_exec_check_disable__
template <class Derived,
class KeyInputIt,
class ValInputIt,
class ValOutputIt,
class Init,
class BinaryPred,
class ScanOp>
ValOutputIt __host__ __device__
exclusive_scan_by_key(execution_policy<Derived> &policy,
KeyInputIt key_first,
KeyInputIt key_last,
ValInputIt value_first,
ValOutputIt value_result,
Init init,
BinaryPred binary_pred,
ScanOp scan_op)
{
ValOutputIt ret = value_result;
if (__THRUST_HAS_CUDART__)
{
ret = thrust::cuda_cub::detail::exclusive_scan_by_key_n(
policy,
key_first,
value_first,
value_result,
thrust::distance(key_first, key_last),
init,
binary_pred,
scan_op);
}
else
{
#if !__THRUST_HAS_CUDART__
ret = thrust::exclusive_scan_by_key(cvt_to_seq(derived_cast(policy)),
key_first,
key_last,
value_first,
value_result,
init,
binary_pred,
scan_op);
#endif
}
return ret;
}
template <class Derived,
class KeyInputIt,
class ValInputIt,
class ValOutputIt,
class Init,
class BinaryPred>
ValOutputIt __host__ __device__
exclusive_scan_by_key(execution_policy<Derived> &policy,
KeyInputIt key_first,
KeyInputIt key_last,
ValInputIt value_first,
ValOutputIt value_result,
Init init,
BinaryPred binary_pred)
{
return cuda_cub::exclusive_scan_by_key(policy,
key_first,
key_last,
value_first,
value_result,
init,
binary_pred,
thrust::plus<>());
}
template <class Derived,
class KeyInputIt,
class ValInputIt,
class ValOutputIt,
class Init>
ValOutputIt __host__ __device__
exclusive_scan_by_key(execution_policy<Derived> &policy,
KeyInputIt key_first,
KeyInputIt key_last,
ValInputIt value_first,
ValOutputIt value_result,
Init init)
{
return cuda_cub::exclusive_scan_by_key(policy,
key_first,
key_last,
value_first,
value_result,
init,
thrust::equal_to<>());
}
template <class Derived,
class KeyInputIt,
class ValInputIt,
class ValOutputIt>
ValOutputIt __host__ __device__
exclusive_scan_by_key(execution_policy<Derived> &policy,
KeyInputIt key_first,
KeyInputIt key_last,
ValInputIt value_first,
ValOutputIt value_result)
{
using value_type = typename thrust::iterator_traits<ValInputIt>::value_type;
return cuda_cub::exclusive_scan_by_key(policy,
key_first,
key_last,
value_first,
value_result,
value_type{});
}
} // namespace cuda_cub
THRUST_NAMESPACE_END
#include <thrust/scan.h>
#endif // NVCC
|
