FM / algorithm

/usr/include/boost/compute/algorithm

Name	Size	Mode	Actions
detail/	-	0755	rm
accumulate.hpp	6375	0644	edit dl rm
adjacent_difference.hpp	4416	0644	edit dl rm
adjacent_find.hpp	5313	0644	edit dl rm
all_of.hpp	1427	0644	edit dl rm
any_of.hpp	1544	0644	edit dl rm
binary_search.hpp	1480	0644	edit dl rm
copy.hpp	31483	0644	edit dl rm
copy_if.hpp	2574	0644	edit dl rm
copy_n.hpp	1940	0644	edit dl rm
count.hpp	2103	0644	edit dl rm
count_if.hpp	2388	0644	edit dl rm
equal.hpp	2209	0644	edit dl rm
equal_range.hpp	1636	0644	edit dl rm
exclusive_scan.hpp	4042	0644	edit dl rm
fill.hpp	10030	0644	edit dl rm
fill_n.hpp	1367	0644	edit dl rm
find.hpp	2004	0644	edit dl rm
find_end.hpp	4772	0644	edit dl rm
find_if.hpp	1504	0644	edit dl rm
find_if_not.hpp	1652	0644	edit dl rm
for_each.hpp	2131	0644	edit dl rm
for_each_n.hpp	1423	0644	edit dl rm
gather.hpp	2796	0644	edit dl rm
generate.hpp	1903	0644	edit dl rm
generate_n.hpp	1277	0644	edit dl rm
includes.hpp	5615	0644	edit dl rm
inclusive_scan.hpp	3402	0644	edit dl rm
inner_product.hpp	3849	0644	edit dl rm
inplace_merge.hpp	2047	0644	edit dl rm
iota.hpp	1735	0644	edit dl rm
is_partitioned.hpp	1785	0644	edit dl rm
is_permutation.hpp	2744	0644	edit dl rm
is_sorted.hpp	2436	0644	edit dl rm
lexicographical_compare.hpp	4950	0644	edit dl rm
lower_bound.hpp	1573	0644	edit dl rm
max_element.hpp	2781	0644	edit dl rm
merge.hpp	5037	0644	edit dl rm
minmax_element.hpp	2668	0644	edit dl rm
min_element.hpp	2780	0644	edit dl rm
mismatch.hpp	3409	0644	edit dl rm
next_permutation.hpp	5703	0644	edit dl rm
none_of.hpp	1426	0644	edit dl rm
nth_element.hpp	2868	0644	edit dl rm
partial_sum.hpp	1676	0644	edit dl rm
partition.hpp	1523	0644	edit dl rm
partition_copy.hpp	2592	0644	edit dl rm
partition_point.hpp	1858	0644	edit dl rm
prev_permutation.hpp	5695	0644	edit dl rm
random_shuffle.hpp	3010	0644	edit dl rm
reduce.hpp	11454	0644	edit dl rm
reduce_by_key.hpp	5933	0644	edit dl rm
remove.hpp	2002	0644	edit dl rm
remove_if.hpp	1850	0644	edit dl rm
replace.hpp	2588	0644	edit dl rm
replace_copy.hpp	2230	0644	edit dl rm
reverse.hpp	2438	0644	edit dl rm
reverse_copy.hpp	2678	0644	edit dl rm
rotate.hpp	1813	0644	edit dl rm
rotate_copy.hpp	1529	0644	edit dl rm
scatter.hpp	3435	0644	edit dl rm
scatter_if.hpp	4730	0644	edit dl rm
search.hpp	2967	0644	edit dl rm
search_n.hpp	4428	0644	edit dl rm
set_difference.hpp	6941	0644	edit dl rm
set_intersection.hpp	6646	0644	edit dl rm
set_symmetric_difference.hpp	7533	0644	edit dl rm
set_union.hpp	7384	0644	edit dl rm
sort.hpp	6569	0644	edit dl rm
sort_by_key.hpp	6156	0644	edit dl rm
stable_partition.hpp	2737	0644	edit dl rm
stable_sort.hpp	3809	0644	edit dl rm
stable_sort_by_key.hpp	6071	0644	edit dl rm
swap_ranges.hpp	1870	0644	edit dl rm
transform.hpp	3252	0644	edit dl rm
transform_if.hpp	4737	0644	edit dl rm
transform_reduce.hpp	3683	0644	edit dl rm
unique.hpp	2565	0644	edit dl rm
unique_copy.hpp	6429	0644	edit dl rm
upper_bound.hpp	1561	0644	edit dl rm

Edit: /usr/include/boost/compute/algorithm/accumulate.hpp (6375B)

//---------------------------------------------------------------------------//
// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//

#ifndef BOOST_COMPUTE_ALGORITHM_ACCUMULATE_HPP
#define BOOST_COMPUTE_ALGORITHM_ACCUMULATE_HPP

#include <boost/static_assert.hpp>
#include <boost/preprocessor/seq/for_each.hpp>

#include <boost/compute/system.hpp>
#include <boost/compute/functional.hpp>
#include <boost/compute/command_queue.hpp>
#include <boost/compute/algorithm/reduce.hpp>
#include <boost/compute/algorithm/detail/serial_accumulate.hpp>
#include <boost/compute/container/array.hpp>
#include <boost/compute/container/vector.hpp>
#include <boost/compute/type_traits/is_device_iterator.hpp>
#include <boost/compute/detail/iterator_range_size.hpp>

namespace boost {
namespace compute {
namespace detail {

// Space complexity O(1)
template<class InputIterator, class T, class BinaryFunction>
inline T generic_accumulate(InputIterator first,
                            InputIterator last,
                            T init,
                            BinaryFunction function,
                            command_queue &queue)
{
    const context &context = queue.get_context();

size_t size = iterator_range_size(first, last);
    if(size == 0){
        return init;
    }

// accumulate on device
    array<T, 1> device_result(context);
    detail::serial_accumulate(
        first, last, device_result.begin(), init, function, queue
    );

// copy result to host
    T result;
    ::boost::compute::copy_n(device_result.begin(), 1, &result, queue);
    return result;
}

// returns true if we can use reduce() instead of accumulate() when
// accumulate() this is true when the function is commutative (such as
// addition of integers) and the initial value is the identity value
// for the operation (zero for addition, one for multiplication).
template<class T, class F>
inline bool can_accumulate_with_reduce(T init, F function)
{
    (void) init;
    (void) function;

return false;
}

/// \internal_
#define BOOST_COMPUTE_DETAIL_DECLARE_CAN_ACCUMULATE_WITH_REDUCE(r, data, type) \
    inline bool can_accumulate_with_reduce(type init, plus<type>) \
    { \
        return init == type(0); \
    } \
    inline bool can_accumulate_with_reduce(type init, multiplies<type>) \
    { \
        return init == type(1); \
    }

BOOST_PP_SEQ_FOR_EACH(
    BOOST_COMPUTE_DETAIL_DECLARE_CAN_ACCUMULATE_WITH_REDUCE,
    _,
    (char_)(uchar_)(short_)(ushort_)(int_)(uint_)(long_)(ulong_)
)

template<class T>
inline bool can_accumulate_with_reduce(T init, min<T>)
{
    return init == (std::numeric_limits<T>::max)();
}

template<class T>
inline bool can_accumulate_with_reduce(T init, max<T>)
{
    return init == (std::numeric_limits<T>::min)();
}

#undef BOOST_COMPUTE_DETAIL_DECLARE_CAN_ACCUMULATE_WITH_REDUCE

template<class InputIterator, class T, class BinaryFunction>
inline T dispatch_accumulate(InputIterator first,
                             InputIterator last,
                             T init,
                             BinaryFunction function,
                             command_queue &queue)
{
    size_t size = iterator_range_size(first, last);
    if(size == 0){
        return init;
    }

if(can_accumulate_with_reduce(init, function)){
        T result;
        reduce(first, last, &result, function, queue);
        return result;
    }
    else {
        return generic_accumulate(first, last, init, function, queue);
    }
}

} // end detail namespace

/// Returns the result of applying \p function to the elements in the
/// range [\p first, \p last) and \p init.
///
/// If no function is specified, \c plus will be used.
///
/// \param first first element in the input range
/// \param last last element in the input range
/// \param init initial value
/// \param function binary reduction function
/// \param queue command queue to perform the operation
///
/// \return the accumulated result value
///
/// In specific situations the call to \c accumulate() can be automatically
/// optimized to a call to the more efficient \c reduce() algorithm. This
/// occurs when the binary reduction function is recognized as associative
/// (such as the \c plus<int> function).
///
/// Note that because floating-point addition is not associative, calling
/// \c accumulate() with \c plus<float> results in a less efficient serial
/// reduction algorithm being executed. If a slight loss in precision is
/// acceptable, the more efficient parallel \c reduce() algorithm should be
/// used instead.
///
/// For example:
/// \code
/// // with vec = boost::compute::vector<int>
/// accumulate(vec.begin(), vec.end(), 0, plus<int>());   // fast
/// reduce(vec.begin(), vec.end(), &result, plus<int>()); // fast
///
/// // with vec = boost::compute::vector<float>
/// accumulate(vec.begin(), vec.end(), 0, plus<float>());   // slow
/// reduce(vec.begin(), vec.end(), &result, plus<float>()); // fast
/// \endcode
///
/// Space complexity: \Omega(1)<br>
/// Space complexity when optimized to \c reduce(): \Omega(n)
///
/// \see reduce()
template<class InputIterator, class T, class BinaryFunction>
inline T accumulate(InputIterator first,
                    InputIterator last,
                    T init,
                    BinaryFunction function,
                    command_queue &queue = system::default_queue())
{
    BOOST_STATIC_ASSERT(is_device_iterator<InputIterator>::value);

return detail::dispatch_accumulate(first, last, init, function, queue);
}

/// \overload
template<class InputIterator, class T>
inline T accumulate(InputIterator first,
                    InputIterator last,
                    T init,
                    command_queue &queue = system::default_queue())
{
    BOOST_STATIC_ASSERT(is_device_iterator<InputIterator>::value);
    typedef typename std::iterator_traits<InputIterator>::value_type IT;

return detail::dispatch_accumulate(first, last, init, plus<IT>(), queue);
}

} // end compute namespace
} // end boost namespace

#endif // BOOST_COMPUTE_ALGORITHM_ACCUMULATE_HPP

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