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151 lines
4.1 KiB
151 lines
4.1 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/detail/config.h>
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#include <thrust/detail/cstdint.h>
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#include <thrust/system/cuda/detail/detail/set_operation.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 cuda
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{
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namespace detail
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{
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namespace set_symmetric_difference_detail
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{
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struct serial_bounded_set_symmetric_difference
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{
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// max_input_size <= 32
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template<typename Size, typename InputIterator1, typename InputIterator2, typename OutputIterator, typename Compare>
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inline __device__
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thrust::detail::uint32_t operator()(Size max_input_size,
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InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, InputIterator2 last2,
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OutputIterator result,
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Compare comp)
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{
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thrust::detail::uint32_t active_mask = 0;
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thrust::detail::uint32_t active_bit = 1;
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while(first1 != last1 && first2 != last2)
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{
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if(comp(*first1,*first2))
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{
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*result = *first1;
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active_mask |= active_bit;
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++first1;
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} // end if
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else if(comp(*first2,*first1))
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{
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*result = *first2;
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active_mask |= active_bit;
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++first2;
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} // end else if
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else
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{
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++first1;
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++first2;
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} // end else
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++result;
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active_bit <<= 1;
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} // end while
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while(first1 != last1)
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{
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*result = *first1;
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++first1;
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++result;
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active_mask |= active_bit;
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active_bit <<= 1;
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}
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while(first2 != last2)
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{
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*result = *first2;
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++first2;
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++result;
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active_mask |= active_bit;
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active_bit <<= 1;
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}
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return active_mask;
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}
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template<typename Size, typename InputIterator1, typename InputIterator2, typename Compare>
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inline __device__
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Size count(Size max_input_size,
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InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, InputIterator2 last2,
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Compare comp)
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{
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Size result = 0;
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while(first1 != last1 && first2 != last2)
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{
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if(comp(*first1,*first2))
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{
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++first1;
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++result;
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} // end if
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else if(comp(*first2,*first1))
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{
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++first2;
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++result;
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} // end else if
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else
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{
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++first1;
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++first2;
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} // end else
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} // end while
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return result + thrust::max(last1 - first1,last2 - first2);
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}
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}; // end serial_bounded_set_symmetric_difference
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} // end namespace set_symmetric_difference_detail
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template<typename DerivedPolicy,
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typename RandomAccessIterator1,
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typename RandomAccessIterator2,
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typename RandomAccessIterator3,
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typename Compare>
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RandomAccessIterator3 set_symmetric_difference(execution_policy<DerivedPolicy> &exec,
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RandomAccessIterator1 first1,
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RandomAccessIterator1 last1,
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RandomAccessIterator2 first2,
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RandomAccessIterator2 last2,
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RandomAccessIterator3 result,
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Compare comp)
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{
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return thrust::system::cuda::detail::detail::set_operation(exec, first1, last1, first2, last2, result, comp, set_symmetric_difference_detail::serial_bounded_set_symmetric_difference());
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} // end set_symmetric_difference
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} // end namespace detail
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} // end namespace cuda
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} // end namespace system
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} // end namespace thrust
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