71 lines
2.4 KiB
Plaintext
71 lines
2.4 KiB
Plaintext
//---------------------------------------------------------------------------//
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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_FIND_EXTREMA_HPP
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#define BOOST_COMPUTE_ALGORITHM_DETAIL_FIND_EXTREMA_HPP
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#include <boost/compute/detail/iterator_range_size.hpp>
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#include <boost/compute/algorithm/detail/find_extrema_on_cpu.hpp>
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#include <boost/compute/algorithm/detail/find_extrema_with_reduce.hpp>
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#include <boost/compute/algorithm/detail/find_extrema_with_atomics.hpp>
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#include <boost/compute/algorithm/detail/serial_find_extrema.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 Compare>
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inline InputIterator find_extrema(InputIterator first,
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InputIterator last,
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Compare compare,
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const bool find_minimum,
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command_queue &queue)
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{
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size_t count = iterator_range_size(first, last);
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// handle trivial cases
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if(count == 0 || count == 1){
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return first;
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}
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const device &device = queue.get_device();
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// CPU
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if(device.type() & device::cpu) {
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return find_extrema_on_cpu(first, last, compare, find_minimum, queue);
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}
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// GPU
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// use serial method for small inputs
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if(count < 512)
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{
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return serial_find_extrema(first, last, compare, find_minimum, queue);
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}
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// find_extrema_with_reduce() is used only if requirements are met
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if(find_extrema_with_reduce_requirements_met(first, last, queue))
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{
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return find_extrema_with_reduce(first, last, compare, find_minimum, queue);
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}
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// use serial method for OpenCL version 1.0 due to
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// problems with atomic_cmpxchg()
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#ifndef CL_VERSION_1_1
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return serial_find_extrema(first, last, compare, find_minimum, queue);
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#endif
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return find_extrema_with_atomics(first, last, compare, find_minimum, queue);
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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_FIND_EXTREMA_HPP
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