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138 lines
3.7 KiB
138 lines
3.7 KiB
/* |
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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_difference_detail |
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{ |
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struct serial_bounded_set_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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++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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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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} // 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 + last1 - first1; |
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} |
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}; // end serial_bounded_set_difference |
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} // end namespace set_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_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_difference_detail::serial_bounded_set_difference()); |
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} // end set_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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