ceph/src/boost/libs/compute/include/boost/compute/algorithm/detail/serial_accumulate.hpp

   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_ACCUMULATE_HPP
  12 #define BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_ACCUMULATE_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
  18 namespace boost {
  19 namespace compute {
  20 namespace detail {
  21
  22 template<class InputIterator, class OutputIterator, class T, class BinaryFunction>
  23 inline void serial_accumulate(InputIterator first,
  24                               InputIterator last,
  25                               OutputIterator result,
  26                               T init,
  27                               BinaryFunction function,
  28                               command_queue &queue)
  29 {
  30     const context &context = queue.get_context();
  31     size_t count = detail::iterator_range_size(first, last);
  32
  33     meta_kernel k("serial_accumulate");
  34     size_t init_arg = k.add_arg<T>("init");
  35     size_t count_arg = k.add_arg<cl_uint>("count");
  36
  37     k <<
  38         k.decl<T>("result") << " = init;\n" <<
  39         "for(uint i = 0; i < count; i++)\n" <<
  40         "    result = " << function(k.var<T>("result"),
  41                                     first[k.var<cl_uint>("i")]) << ";\n" <<
  42         result[0] << " = result;\n";
  43
  44     kernel kernel = k.compile(context);
  45
  46     kernel.set_arg(init_arg, init);
  47     kernel.set_arg(count_arg, static_cast<cl_uint>(count));
  48
  49     queue.enqueue_task(kernel);
  50 }
  51
  52 } // end detail namespace
  53 } // end compute namespace
  54 } // end boost namespace
  55
  56 #endif // BOOST_COMPUTE_ALGORITHM_DETAIL_SERIAL_ACCUMULATE_HPP