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151 lines
5.3 KiB
151 lines
5.3 KiB
11 years ago
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/*
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* Copyright 2008-2012 NVIDIA Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <thrust/iterator/iterator_traits.h>
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#include <thrust/detail/temporary_array.h>
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#include <thrust/system/detail/internal/scalar/merge.h>
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#include <thrust/system/detail/internal/scalar/insertion_sort.h>
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namespace thrust
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{
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namespace system
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{
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namespace detail
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{
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namespace internal
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{
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namespace scalar
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{
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namespace detail
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{
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template <typename RandomAccessIterator,
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typename StrictWeakOrdering>
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void inplace_merge(RandomAccessIterator first,
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RandomAccessIterator middle,
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RandomAccessIterator last,
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StrictWeakOrdering comp)
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{
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// XXX the type of exec should be:
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// typedef decltype(select_system(first, middle, last)) DerivedPolicy;
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typedef typename thrust::iterator_system<RandomAccessIterator>::type DerivedPolicy;
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typedef typename thrust::iterator_value<RandomAccessIterator>::type value_type;
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// XXX assumes DerivedPolicy is default constructible
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// XXX find a way to get a stateful execution policy into this function
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// or simply pass scratch space
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DerivedPolicy exec;
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thrust::detail::temporary_array<value_type, DerivedPolicy> a(exec, first, middle);
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thrust::detail::temporary_array<value_type, DerivedPolicy> b(exec, middle, last);
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thrust::system::detail::internal::scalar::merge(a.begin(), a.end(), b.begin(), b.end(), first, comp);
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}
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template <typename RandomAccessIterator1,
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typename RandomAccessIterator2,
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typename StrictWeakOrdering>
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void inplace_merge_by_key(RandomAccessIterator1 first1,
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RandomAccessIterator1 middle1,
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RandomAccessIterator1 last1,
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RandomAccessIterator2 first2,
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StrictWeakOrdering comp)
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{
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// XXX the type of exec should be:
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// typedef decltype(select_system(first1, middle1, last1, first2)) DerivedPolicy;
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typedef typename thrust::iterator_system<RandomAccessIterator1>::type DerivedPolicy;
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typedef typename thrust::iterator_value<RandomAccessIterator1>::type value_type1;
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typedef typename thrust::iterator_value<RandomAccessIterator2>::type value_type2;
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RandomAccessIterator2 middle2 = first2 + (middle1 - first1);
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RandomAccessIterator2 last2 = first2 + (last1 - first1);
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// XXX assumes DerivedPolicy is default constructible
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// XXX find a way to get a stateful exec into this function
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// or simply pass scratch space
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DerivedPolicy exec;
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thrust::detail::temporary_array<value_type1, DerivedPolicy> lhs1(exec, first1, middle1);
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thrust::detail::temporary_array<value_type1, DerivedPolicy> rhs1(exec, middle1, last1);
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thrust::detail::temporary_array<value_type2, DerivedPolicy> lhs2(exec, first2, middle2);
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thrust::detail::temporary_array<value_type2, DerivedPolicy> rhs2(exec, middle2, last2);
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thrust::system::detail::internal::scalar::merge_by_key
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(lhs1.begin(), lhs1.end(), rhs1.begin(), rhs1.end(),
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lhs2.begin(), rhs2.begin(),
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first1, first2, comp);
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}
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} // end namespace detail
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//////////////
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// Key Sort //
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//////////////
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template <typename RandomAccessIterator,
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typename StrictWeakOrdering>
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void stable_merge_sort(RandomAccessIterator first,
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RandomAccessIterator last,
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StrictWeakOrdering comp)
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{
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if (last - first < 32)
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{
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thrust::system::detail::internal::scalar::insertion_sort(first, last, comp);
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}
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else
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{
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RandomAccessIterator middle = first + (last - first) / 2;
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thrust::system::detail::internal::scalar::stable_merge_sort(first, middle, comp);
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thrust::system::detail::internal::scalar::stable_merge_sort(middle, last, comp);
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detail::inplace_merge(first, middle, last, comp);
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}
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}
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////////////////////
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// Key-Value Sort //
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////////////////////
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template <typename RandomAccessIterator1,
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typename RandomAccessIterator2,
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typename StrictWeakOrdering>
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void stable_merge_sort_by_key(RandomAccessIterator1 first1,
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RandomAccessIterator1 last1,
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RandomAccessIterator2 first2,
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StrictWeakOrdering comp)
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{
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if (last1 - first1 <= 32)
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{
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thrust::system::detail::internal::scalar::insertion_sort_by_key(first1, last1, first2, comp);
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}
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else
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{
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RandomAccessIterator1 middle1 = first1 + (last1 - first1) / 2;
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RandomAccessIterator2 middle2 = first2 + (last1 - first1) / 2;
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thrust::system::detail::internal::scalar::stable_merge_sort_by_key(first1, middle1, first2, comp);
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thrust::system::detail::internal::scalar::stable_merge_sort_by_key(middle1, last1, middle2, comp);
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detail::inplace_merge_by_key(first1, middle1, last1, first2, comp);
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}
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}
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} // end namespace scalar
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} // end namespace internal
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} // end namespace detail
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} // end namespace system
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} // end namespace thrust
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