160 lines
5.7 KiB
Plaintext
160 lines
5.7 KiB
Plaintext
//---------------------------------------------------------------------------//
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// Copyright (c) 2016 Jakub Szuppe <j.szuppe@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_STABLE_SORT_BY_KEY_HPP
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#define BOOST_COMPUTE_ALGORITHM_STABLE_SORT_BY_KEY_HPP
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#include <iterator>
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#include <boost/compute/system.hpp>
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#include <boost/compute/command_queue.hpp>
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#include <boost/compute/algorithm/sort_by_key.hpp>
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#include <boost/compute/detail/iterator_range_size.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 KeyIterator, class ValueIterator>
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inline void
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dispatch_gpu_ssort_by_key(KeyIterator keys_first,
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KeyIterator keys_last,
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ValueIterator values_first,
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less<typename std::iterator_traits<KeyIterator>::value_type> compare,
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command_queue &queue,
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typename boost::enable_if_c<
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is_radix_sortable<
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typename std::iterator_traits<KeyIterator>::value_type
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>::value
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>::type* = 0)
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{
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size_t count = detail::iterator_range_size(keys_first, keys_last);
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if(count < 32){
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detail::serial_insertion_sort_by_key(
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keys_first, keys_last, values_first, compare, queue
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);
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}
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else {
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detail::radix_sort_by_key(
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keys_first, keys_last, values_first, queue
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);
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}
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}
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template<class KeyIterator, class ValueIterator>
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inline void
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dispatch_gpu_ssort_by_key(KeyIterator keys_first,
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KeyIterator keys_last,
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ValueIterator values_first,
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greater<typename std::iterator_traits<KeyIterator>::value_type> compare,
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command_queue &queue,
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typename boost::enable_if_c<
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is_radix_sortable<
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typename std::iterator_traits<KeyIterator>::value_type
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>::value
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>::type* = 0)
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{
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size_t count = detail::iterator_range_size(keys_first, keys_last);
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if(count < 32){
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detail::serial_insertion_sort_by_key(
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keys_first, keys_last, values_first, compare, queue
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);
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}
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else {
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// radix sorts in descending order
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detail::radix_sort_by_key(
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keys_first, keys_last, values_first, false, queue
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);
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}
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}
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template<class KeyIterator, class ValueIterator, class Compare>
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inline void dispatch_gpu_ssort_by_key(KeyIterator keys_first,
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KeyIterator keys_last,
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ValueIterator values_first,
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Compare compare,
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command_queue &queue)
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{
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size_t count = detail::iterator_range_size(keys_first, keys_last);
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if(count < 32){
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detail::serial_insertion_sort_by_key(
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keys_first, keys_last, values_first,
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compare, queue
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);
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} else {
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detail::merge_sort_by_key_on_gpu(
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keys_first, keys_last, values_first,
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compare, true /* stable */, queue
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);
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}
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}
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template<class KeyIterator, class ValueIterator, class Compare>
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inline void dispatch_ssort_by_key(KeyIterator keys_first,
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KeyIterator keys_last,
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ValueIterator values_first,
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Compare compare,
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command_queue &queue)
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{
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if(queue.get_device().type() & device::gpu) {
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dispatch_gpu_ssort_by_key(
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keys_first, keys_last, values_first, compare, queue
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);
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return;
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}
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::boost::compute::detail::merge_sort_by_key_on_cpu(
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keys_first, keys_last, values_first, compare, queue
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);
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}
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} // end detail namespace
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/// Performs a key-value stable sort using the keys in the range [\p keys_first,
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/// \p keys_last) on the values in the range [\p values_first,
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/// \p values_first \c + (\p keys_last \c - \p keys_first)) using \p compare.
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///
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/// If no compare function is specified, \c less is used.
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///
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/// \see sort()
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template<class KeyIterator, class ValueIterator, class Compare>
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inline void stable_sort_by_key(KeyIterator keys_first,
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KeyIterator keys_last,
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ValueIterator values_first,
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Compare compare,
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command_queue &queue = system::default_queue())
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{
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::boost::compute::detail::dispatch_ssort_by_key(
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keys_first, keys_last, values_first, compare, queue
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);
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}
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/// \overload
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template<class KeyIterator, class ValueIterator>
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inline void stable_sort_by_key(KeyIterator keys_first,
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KeyIterator keys_last,
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ValueIterator values_first,
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command_queue &queue = system::default_queue())
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{
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typedef typename std::iterator_traits<KeyIterator>::value_type key_type;
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::boost::compute::stable_sort_by_key(
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keys_first, keys_last, values_first, less<key_type>(), queue
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);
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}
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_ALGORITHM_STABLE_SORT_BY_KEY_HPP
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