GOSTCoin CUDA miner project, compatible with most nvidia cards, containing only gostd algo
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

154 lines
4.1 KiB

/*
* Copyright 2008-2012 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file scan.h
* \brief Sequential implementations of scan functions.
*/
#pragma once
#include <thrust/detail/config.h>
#include <thrust/system/cpp/detail/execution_policy.h>
#include <thrust/iterator/iterator_traits.h>
#include <thrust/detail/type_traits.h>
#include <thrust/detail/type_traits/function_traits.h>
#include <thrust/detail/type_traits/iterator/is_output_iterator.h>
#include <thrust/detail/function.h>
namespace thrust
{
namespace system
{
namespace detail
{
namespace internal
{
namespace scalar
{
template<typename InputIterator,
typename OutputIterator,
typename BinaryFunction>
OutputIterator inclusive_scan(InputIterator first,
InputIterator last,
OutputIterator result,
BinaryFunction binary_op)
{
// the pseudocode for deducing the type of the temporary used below:
//
// if BinaryFunction is AdaptableBinaryFunction
// TemporaryType = AdaptableBinaryFunction::result_type
// else if OutputIterator is a "pure" output iterator
// TemporaryType = InputIterator::value_type
// else
// TemporaryType = OutputIterator::value_type
//
// XXX upon c++0x, TemporaryType needs to be:
// result_of<BinaryFunction>::type
using namespace thrust::detail;
typedef typename eval_if<
has_result_type<BinaryFunction>::value,
result_type<BinaryFunction>,
eval_if<
is_output_iterator<OutputIterator>::value,
thrust::iterator_value<InputIterator>,
thrust::iterator_value<OutputIterator>
>
>::type ValueType;
// wrap binary_op
thrust::detail::host_function<
BinaryFunction,
ValueType
> wrapped_binary_op(binary_op);
if(first != last)
{
ValueType sum = *first;
*result = sum;
for(++first, ++result; first != last; ++first, ++result)
*result = sum = wrapped_binary_op(sum,*first);
}
return result;
}
template<typename InputIterator,
typename OutputIterator,
typename T,
typename BinaryFunction>
OutputIterator exclusive_scan(InputIterator first,
InputIterator last,
OutputIterator result,
T init,
BinaryFunction binary_op)
{
// the pseudocode for deducing the type of the temporary used below:
//
// if BinaryFunction is AdaptableBinaryFunction
// TemporaryType = AdaptableBinaryFunction::result_type
// else if OutputIterator is a "pure" output iterator
// TemporaryType = InputIterator::value_type
// else
// TemporaryType = OutputIterator::value_type
//
// XXX upon c++0x, TemporaryType needs to be:
// result_of<BinaryFunction>::type
using namespace thrust::detail;
typedef typename eval_if<
has_result_type<BinaryFunction>::value,
result_type<BinaryFunction>,
eval_if<
is_output_iterator<OutputIterator>::value,
thrust::iterator_value<InputIterator>,
thrust::iterator_value<OutputIterator>
>
>::type ValueType;
if(first != last)
{
ValueType tmp = *first; // temporary value allows in-situ scan
ValueType sum = init;
*result = sum;
sum = binary_op(sum, tmp);
for(++first, ++result; first != last; ++first, ++result)
{
tmp = *first;
*result = sum;
sum = binary_op(sum, tmp);
}
}
return result;
}
} // end namespace scalar
} // end namespace internal
} // end namespace detail
} // end namespace system
} // end namespace thrust