63 lines
2.1 KiB
Plaintext
63 lines
2.1 KiB
Plaintext
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//---------------------------------------------------------------------------//
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// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#ifndef BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_REDUCE_HPP
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#define BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_REDUCE_HPP
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/detail/meta_kernel.hpp>
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#include <boost/compute/detail/iterator_range_size.hpp>
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#include <boost/compute/type_traits/result_of.hpp>
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namespace boost {
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namespace compute {
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namespace detail {
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template<class InputIterator, class OutputIterator, class BinaryFunction>
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inline void serial_reduce(InputIterator first,
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InputIterator last,
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OutputIterator result,
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BinaryFunction function,
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command_queue &queue)
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{
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typedef typename
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std::iterator_traits<InputIterator>::value_type T;
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typedef typename
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::boost::compute::result_of<BinaryFunction(T, T)>::type result_type;
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const context &context = queue.get_context();
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size_t count = detail::iterator_range_size(first, last);
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if(count == 0){
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return;
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}
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meta_kernel k("serial_reduce");
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size_t count_arg = k.add_arg<cl_uint>("count");
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k <<
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k.decl<result_type>("result") << " = " << first[0] << ";\n" <<
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"for(uint i = 1; i < count; i++)\n" <<
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" result = " << function(k.var<T>("result"),
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first[k.var<uint_>("i")]) << ";\n" <<
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result[0] << " = result;\n";
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kernel kernel = k.compile(context);
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kernel.set_arg(count_arg, static_cast<uint_>(count));
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queue.enqueue_task(kernel);
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}
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} // end detail namespace
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_REDUCE_HPP
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