cub/thread/thread_scan.cuh
File members: cub/thread/thread_scan.cuh
/******************************************************************************
* Copyright (c) 2011, Duane Merrill. All rights reserved.
* Copyright (c) 2011-2018, 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:
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* notice, this list of conditions and the following disclaimer.
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* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
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* 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
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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#pragma once
#include <cub/config.cuh>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#include <cub/thread/thread_operators.cuh>
CUB_NAMESPACE_BEGIN
namespace internal
{
template <int LENGTH, typename T, typename ScanOp>
_CCCL_DEVICE _CCCL_FORCEINLINE T
ThreadScanExclusive(T inclusive, T exclusive, T* input, T* output, ScanOp scan_op, Int2Type<LENGTH> /*length*/)
{
#pragma unroll
for (int i = 0; i < LENGTH; ++i)
{
inclusive = scan_op(exclusive, input[i]);
output[i] = exclusive;
exclusive = inclusive;
}
return inclusive;
}
template <int LENGTH, typename T, typename ScanOp>
_CCCL_DEVICE _CCCL_FORCEINLINE T
ThreadScanExclusive(T* input, T* output, ScanOp scan_op, T prefix, bool apply_prefix = true)
{
T inclusive = input[0];
if (apply_prefix)
{
inclusive = scan_op(prefix, inclusive);
}
output[0] = prefix;
T exclusive = inclusive;
return ThreadScanExclusive(inclusive, exclusive, input + 1, output + 1, scan_op, Int2Type<LENGTH - 1>());
}
template <int LENGTH, typename T, typename ScanOp>
_CCCL_DEVICE _CCCL_FORCEINLINE T
ThreadScanExclusive(T (&input)[LENGTH], T (&output)[LENGTH], ScanOp scan_op, T prefix, bool apply_prefix = true)
{
return ThreadScanExclusive<LENGTH>((T*) input, (T*) output, scan_op, prefix, apply_prefix);
}
template <int LENGTH, typename T, typename ScanOp>
_CCCL_DEVICE _CCCL_FORCEINLINE T
ThreadScanInclusive(T inclusive, T* input, T* output, ScanOp scan_op, Int2Type<LENGTH> /*length*/)
{
#pragma unroll
for (int i = 0; i < LENGTH; ++i)
{
inclusive = scan_op(inclusive, input[i]);
output[i] = inclusive;
}
return inclusive;
}
template <int LENGTH, typename T, typename ScanOp>
_CCCL_DEVICE _CCCL_FORCEINLINE T ThreadScanInclusive(T* input, T* output, ScanOp scan_op)
{
T inclusive = input[0];
output[0] = inclusive;
// Continue scan
return ThreadScanInclusive(inclusive, input + 1, output + 1, scan_op, Int2Type<LENGTH - 1>());
}
template <int LENGTH, typename T, typename ScanOp>
_CCCL_DEVICE _CCCL_FORCEINLINE T ThreadScanInclusive(T (&input)[LENGTH], T (&output)[LENGTH], ScanOp scan_op)
{
return ThreadScanInclusive<LENGTH>((T*) input, (T*) output, scan_op);
}
template <int LENGTH, typename T, typename ScanOp>
_CCCL_DEVICE _CCCL_FORCEINLINE T
ThreadScanInclusive(T* input, T* output, ScanOp scan_op, T prefix, bool apply_prefix = true)
{
T inclusive = input[0];
if (apply_prefix)
{
inclusive = scan_op(prefix, inclusive);
}
output[0] = inclusive;
// Continue scan
return ThreadScanInclusive(inclusive, input + 1, output + 1, scan_op, Int2Type<LENGTH - 1>());
}
template <int LENGTH, typename T, typename ScanOp>
_CCCL_DEVICE _CCCL_FORCEINLINE T
ThreadScanInclusive(T (&input)[LENGTH], T (&output)[LENGTH], ScanOp scan_op, T prefix, bool apply_prefix = true)
{
return ThreadScanInclusive<LENGTH>((T*) input, (T*) output, scan_op, prefix, apply_prefix);
}
} // namespace internal
CUB_NAMESPACE_END