projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | //---------------------------------------------------------------------------// |
| 2 | // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com> | |
| 3 | // | |
| 4 | // Distributed under the Boost Software License, Version 1.0 | |
| 5 | // See accompanying file LICENSE_1_0.txt or copy at | |
| 6 | // http://www.boost.org/LICENSE_1_0.txt | |
| 7 | // | |
| 8 | // See http://boostorg.github.com/compute for more information. | |
| 9 | //---------------------------------------------------------------------------// | |
| 10 | ||
| 11 | #ifndef BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_REDUCE_HPP | |
| 12 | #define BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_REDUCE_HPP | |
| 13 | ||
| 14 | #include <boost/compute/command_queue.hpp> | |
| 15 | #include <boost/compute/detail/meta_kernel.hpp> | |
| 16 | #include <boost/compute/detail/iterator_range_size.hpp> | |
| 17 | #include <boost/compute/type_traits/result_of.hpp> | |
| 18 | ||
| 19 | namespace boost { | |
| 20 | namespace compute { | |
| 21 | namespace detail { | |
| 22 | ||
| 23 | template<class InputIterator, class OutputIterator, class BinaryFunction> | |
| 24 | inline void serial_reduce(InputIterator first, | |
| 25 | InputIterator last, | |
| 26 | OutputIterator result, | |
| 27 | BinaryFunction function, | |
| 28 | command_queue &queue) | |
| 29 | { | |
| 30 | typedef typename | |
| 31 | std::iterator_traits<InputIterator>::value_type T; | |
| 32 | typedef typename | |
| 33 | ::boost::compute::result_of<BinaryFunction(T, T)>::type result_type; | |
| 34 | ||
| 35 | const context &context = queue.get_context(); | |
| 36 | size_t count = detail::iterator_range_size(first, last); | |
| 37 | if(count == 0){ | |
| 38 | return; | |
| 39 | } | |
| 40 | ||
| 41 | meta_kernel k("serial_reduce"); | |
| 42 | size_t count_arg = k.add_arg<cl_uint>("count"); | |
| 43 | ||
| 44 | k << | |
| 45 | k.decl<result_type>("result") << " = " << first[0] << ";\n" << | |
| 46 | "for(uint i = 1; i < count; i++)\n" << | |
| 47 | " result = " << function(k.var<T>("result"), | |
| 48 | first[k.var<uint_>("i")]) << ";\n" << | |
| 49 | result[0] << " = result;\n"; | |
| 50 | ||
| 51 | kernel kernel = k.compile(context); | |
| 52 | ||
| 53 | kernel.set_arg(count_arg, static_cast<uint_>(count)); | |
| 54 | ||
| 55 | queue.enqueue_task(kernel); | |
| 56 | } | |
| 57 | ||
| 58 | } // end detail namespace | |
| 59 | } // end compute namespace | |
| 60 | } // end boost namespace | |
| 61 | ||
| 62 | #endif // BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_REDUCE_HPP |