501 lines
19 KiB
C++
501 lines
19 KiB
C++
// -*- C++ -*-
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// Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/**
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* @file parallel/numeric
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*
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* @brief Parallel STL function calls corresponding to stl_numeric.h.
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* The functions defined here mainly do case switches and
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* call the actual parallelized versions in other files.
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* Inlining policy: Functions that basically only contain one function call,
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* are declared inline.
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* This file is a GNU parallel extension to the Standard C++ Library.
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*/
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// Written by Johannes Singler and Felix Putze.
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#ifndef _GLIBCXX_PARALLEL_NUMERIC_H
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#define _GLIBCXX_PARALLEL_NUMERIC_H 1
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#include <numeric>
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#include <functional>
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#include <parallel/numericfwd.h>
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#include <parallel/iterator.h>
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#include <parallel/for_each.h>
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#include <parallel/for_each_selectors.h>
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#include <parallel/partial_sum.h>
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namespace std
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{
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namespace __parallel
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{
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// Sequential fallback.
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template<typename InputIterator, typename T>
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inline T
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accumulate(InputIterator begin, InputIterator end, T init,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_P::accumulate(begin, end, init); }
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template<typename InputIterator, typename T, typename BinaryOperation>
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inline T
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accumulate(InputIterator begin, InputIterator end, T init,
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BinaryOperation binary_op, __gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_P::accumulate(begin, end, init, binary_op); }
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// Sequential fallback for input iterator case.
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template<typename InputIterator, typename T, typename IteratorTag>
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inline T
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accumulate_switch(InputIterator begin, InputIterator end,
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T init, IteratorTag)
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{ return accumulate(begin, end, init, __gnu_parallel::sequential_tag()); }
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template<typename InputIterator, typename T, typename BinaryOperation,
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typename IteratorTag>
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inline T
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accumulate_switch(InputIterator begin, InputIterator end, T init,
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BinaryOperation binary_op, IteratorTag)
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{ return accumulate(begin, end, init, binary_op,
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__gnu_parallel::sequential_tag()); }
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// Parallel algorithm for random access iterators.
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template<typename _RandomAccessIterator, typename T,
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typename BinaryOperation>
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T
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accumulate_switch(_RandomAccessIterator begin, _RandomAccessIterator end,
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T init, BinaryOperation binary_op,
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random_access_iterator_tag,
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__gnu_parallel::_Parallelism parallelism_tag
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= __gnu_parallel::parallel_unbalanced)
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{
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if (_GLIBCXX_PARALLEL_CONDITION(
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static_cast<__gnu_parallel::sequence_index_t>(end - begin)
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>= __gnu_parallel::_Settings::get().accumulate_minimal_n
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&& __gnu_parallel::is_parallel(parallelism_tag)))
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{
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T res = init;
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__gnu_parallel::accumulate_selector<_RandomAccessIterator>
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my_selector;
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__gnu_parallel::
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for_each_template_random_access_ed(begin, end,
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__gnu_parallel::nothing(),
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my_selector,
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__gnu_parallel::
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accumulate_binop_reduct
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<BinaryOperation>(binary_op),
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res, res, -1);
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return res;
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}
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else
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return accumulate(begin, end, init, binary_op,
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__gnu_parallel::sequential_tag());
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}
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// Public interface.
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template<typename InputIterator, typename T>
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inline T
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accumulate(InputIterator begin, InputIterator end, T init,
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__gnu_parallel::_Parallelism parallelism_tag)
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{
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typedef std::iterator_traits<InputIterator> iterator_traits;
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typedef typename iterator_traits::value_type value_type;
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typedef typename iterator_traits::iterator_category iterator_category;
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return accumulate_switch(begin, end, init,
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__gnu_parallel::plus<T, value_type>(),
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iterator_category(), parallelism_tag);
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}
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template<typename InputIterator, typename T>
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inline T
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accumulate(InputIterator begin, InputIterator end, T init)
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{
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typedef std::iterator_traits<InputIterator> iterator_traits;
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typedef typename iterator_traits::value_type value_type;
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typedef typename iterator_traits::iterator_category iterator_category;
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return accumulate_switch(begin, end, init,
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__gnu_parallel::plus<T, value_type>(),
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iterator_category());
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}
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template<typename InputIterator, typename T, typename BinaryOperation>
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inline T
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accumulate(InputIterator begin, InputIterator end, T init,
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BinaryOperation binary_op,
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__gnu_parallel::_Parallelism parallelism_tag)
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{
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typedef iterator_traits<InputIterator> iterator_traits;
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typedef typename iterator_traits::iterator_category iterator_category;
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return accumulate_switch(begin, end, init, binary_op,
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iterator_category(), parallelism_tag);
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}
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template<typename InputIterator, typename T, typename BinaryOperation>
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inline T
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accumulate(InputIterator begin, InputIterator end, T init,
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BinaryOperation binary_op)
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{
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typedef iterator_traits<InputIterator> iterator_traits;
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typedef typename iterator_traits::iterator_category iterator_category;
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return accumulate_switch(begin, end, init, binary_op,
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iterator_category());
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}
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// Sequential fallback.
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template<typename InputIterator1, typename InputIterator2, typename T>
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inline T
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inner_product(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_P::inner_product(first1, last1, first2, init); }
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template<typename InputIterator1, typename InputIterator2, typename T,
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typename BinaryFunction1, typename BinaryFunction2>
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inline T
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inner_product(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init, BinaryFunction1 binary_op1,
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BinaryFunction2 binary_op2, __gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_P::inner_product(first1, last1, first2, init,
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binary_op1, binary_op2); }
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// Parallel algorithm for random access iterators.
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template<typename RandomAccessIterator1, typename RandomAccessIterator2,
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typename T, typename BinaryFunction1, typename BinaryFunction2>
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T
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inner_product_switch(RandomAccessIterator1 first1,
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RandomAccessIterator1 last1,
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RandomAccessIterator2 first2, T init,
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BinaryFunction1 binary_op1,
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BinaryFunction2 binary_op2,
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random_access_iterator_tag,
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random_access_iterator_tag,
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__gnu_parallel::_Parallelism parallelism_tag
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= __gnu_parallel::parallel_unbalanced)
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{
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if (_GLIBCXX_PARALLEL_CONDITION((last1 - first1)
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>= __gnu_parallel::_Settings::get().
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accumulate_minimal_n
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&& __gnu_parallel::
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is_parallel(parallelism_tag)))
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{
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T res = init;
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__gnu_parallel::
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inner_product_selector<RandomAccessIterator1,
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RandomAccessIterator2, T> my_selector(first1, first2);
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__gnu_parallel::
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for_each_template_random_access_ed(first1, last1, binary_op2,
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my_selector, binary_op1,
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res, res, -1);
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return res;
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}
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else
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return inner_product(first1, last1, first2, init,
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__gnu_parallel::sequential_tag());
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}
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// No parallelism for input iterators.
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template<typename InputIterator1, typename InputIterator2, typename T,
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typename BinaryFunction1, typename BinaryFunction2,
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typename IteratorTag1, typename IteratorTag2>
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inline T
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inner_product_switch(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init,
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BinaryFunction1 binary_op1,
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BinaryFunction2 binary_op2,
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IteratorTag1, IteratorTag2)
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{ return inner_product(first1, last1, first2, init,
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binary_op1, binary_op2,
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__gnu_parallel::sequential_tag()); }
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template<typename InputIterator1, typename InputIterator2, typename T,
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typename BinaryFunction1, typename BinaryFunction2>
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inline T
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inner_product(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init, BinaryFunction1 binary_op1,
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BinaryFunction2 binary_op2,
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__gnu_parallel::_Parallelism parallelism_tag)
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{
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typedef iterator_traits<InputIterator1> traits1_type;
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typedef typename traits1_type::iterator_category iterator1_category;
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typedef iterator_traits<InputIterator2> traits2_type;
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typedef typename traits2_type::iterator_category iterator2_category;
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return inner_product_switch(first1, last1, first2, init, binary_op1,
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binary_op2, iterator1_category(),
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iterator2_category(), parallelism_tag);
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}
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template<typename InputIterator1, typename InputIterator2, typename T,
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typename BinaryFunction1, typename BinaryFunction2>
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inline T
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inner_product(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init, BinaryFunction1 binary_op1,
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BinaryFunction2 binary_op2)
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{
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typedef iterator_traits<InputIterator1> traits1_type;
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typedef typename traits1_type::iterator_category iterator1_category;
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typedef iterator_traits<InputIterator2> traits2_type;
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typedef typename traits2_type::iterator_category iterator2_category;
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return inner_product_switch(first1, last1, first2, init, binary_op1,
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binary_op2, iterator1_category(),
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iterator2_category());
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}
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template<typename InputIterator1, typename InputIterator2, typename T>
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inline T
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inner_product(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init,
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__gnu_parallel::_Parallelism parallelism_tag)
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{
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typedef iterator_traits<InputIterator1> traits_type1;
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typedef typename traits_type1::value_type value_type1;
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typedef iterator_traits<InputIterator2> traits_type2;
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typedef typename traits_type2::value_type value_type2;
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typedef typename
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__gnu_parallel::multiplies<value_type1, value_type2>::result
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multiplies_result_type;
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return inner_product(first1, last1, first2, init,
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__gnu_parallel::plus<T, multiplies_result_type>(),
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__gnu_parallel::
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multiplies<value_type1, value_type2>(),
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parallelism_tag);
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}
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template<typename InputIterator1, typename InputIterator2, typename T>
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inline T
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inner_product(InputIterator1 first1, InputIterator1 last1,
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InputIterator2 first2, T init)
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{
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typedef iterator_traits<InputIterator1> traits_type1;
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typedef typename traits_type1::value_type value_type1;
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typedef iterator_traits<InputIterator2> traits_type2;
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typedef typename traits_type2::value_type value_type2;
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typedef typename
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__gnu_parallel::multiplies<value_type1, value_type2>::result
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multiplies_result_type;
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return inner_product(first1, last1, first2, init,
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__gnu_parallel::plus<T, multiplies_result_type>(),
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__gnu_parallel::
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multiplies<value_type1, value_type2>());
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}
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// Sequential fallback.
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template<typename InputIterator, typename OutputIterator>
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inline OutputIterator
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partial_sum(InputIterator begin, InputIterator end, OutputIterator result,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_P::partial_sum(begin, end, result); }
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// Sequential fallback.
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation>
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inline OutputIterator
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partial_sum(InputIterator begin, InputIterator end, OutputIterator result,
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BinaryOperation bin_op, __gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_P::partial_sum(begin, end, result, bin_op); }
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// Sequential fallback for input iterator case.
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation, typename IteratorTag1,
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typename IteratorTag2>
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inline OutputIterator
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partial_sum_switch(InputIterator begin, InputIterator end,
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OutputIterator result, BinaryOperation bin_op,
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IteratorTag1, IteratorTag2)
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{ return _GLIBCXX_STD_P::partial_sum(begin, end, result, bin_op); }
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// Parallel algorithm for random access iterators.
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation>
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OutputIterator
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partial_sum_switch(InputIterator begin, InputIterator end,
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OutputIterator result, BinaryOperation bin_op,
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random_access_iterator_tag, random_access_iterator_tag)
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{
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if (_GLIBCXX_PARALLEL_CONDITION(
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static_cast<__gnu_parallel::sequence_index_t>(end - begin)
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>= __gnu_parallel::_Settings::get().partial_sum_minimal_n))
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return __gnu_parallel::parallel_partial_sum(begin, end,
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result, bin_op);
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else
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return partial_sum(begin, end, result, bin_op,
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__gnu_parallel::sequential_tag());
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}
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// Public interface.
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template<typename InputIterator, typename OutputIterator>
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inline OutputIterator
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partial_sum(InputIterator begin, InputIterator end, OutputIterator result)
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{
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typedef typename iterator_traits<InputIterator>::value_type value_type;
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return partial_sum(begin, end, result, std::plus<value_type>());
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}
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// Public interface
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation>
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inline OutputIterator
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partial_sum(InputIterator begin, InputIterator end, OutputIterator result,
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BinaryOperation binary_op)
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{
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typedef iterator_traits<InputIterator> traitsi_type;
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typedef typename traitsi_type::iterator_category iteratori_category;
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typedef iterator_traits<OutputIterator> traitso_type;
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typedef typename traitso_type::iterator_category iteratoro_category;
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return partial_sum_switch(begin, end, result, binary_op,
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iteratori_category(), iteratoro_category());
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}
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// Sequential fallback.
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template<typename InputIterator, typename OutputIterator>
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inline OutputIterator
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adjacent_difference(InputIterator begin, InputIterator end,
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OutputIterator result, __gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_P::adjacent_difference(begin, end, result); }
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// Sequential fallback.
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation>
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inline OutputIterator
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adjacent_difference(InputIterator begin, InputIterator end,
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OutputIterator result, BinaryOperation bin_op,
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__gnu_parallel::sequential_tag)
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{ return _GLIBCXX_STD_P::adjacent_difference(begin, end, result, bin_op); }
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// Sequential fallback for input iterator case.
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation, typename IteratorTag1,
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typename IteratorTag2>
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inline OutputIterator
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adjacent_difference_switch(InputIterator begin, InputIterator end,
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OutputIterator result, BinaryOperation bin_op,
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IteratorTag1, IteratorTag2)
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{ return adjacent_difference(begin, end, result, bin_op,
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__gnu_parallel::sequential_tag()); }
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// Parallel algorithm for random access iterators.
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation>
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OutputIterator
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adjacent_difference_switch(InputIterator begin, InputIterator end,
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OutputIterator result, BinaryOperation bin_op,
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random_access_iterator_tag,
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random_access_iterator_tag,
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__gnu_parallel::_Parallelism parallelism_tag
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= __gnu_parallel::parallel_balanced)
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{
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if (_GLIBCXX_PARALLEL_CONDITION(
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static_cast<__gnu_parallel::sequence_index_t>(end - begin)
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>= __gnu_parallel::_Settings::get().adjacent_difference_minimal_n
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&& __gnu_parallel::is_parallel(parallelism_tag)))
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{
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bool dummy = true;
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typedef __gnu_parallel::iterator_pair<InputIterator, OutputIterator,
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random_access_iterator_tag> ip;
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*result = *begin;
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ip begin_pair(begin + 1, result + 1),
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end_pair(end, result + (end - begin));
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__gnu_parallel::adjacent_difference_selector<ip> functionality;
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__gnu_parallel::
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for_each_template_random_access_ed(begin_pair, end_pair, bin_op,
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functionality,
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__gnu_parallel::dummy_reduct(),
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dummy, dummy, -1);
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return functionality.finish_iterator;
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}
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else
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return adjacent_difference(begin, end, result, bin_op,
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__gnu_parallel::sequential_tag());
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}
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// Public interface.
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template<typename InputIterator, typename OutputIterator>
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inline OutputIterator
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adjacent_difference(InputIterator begin, InputIterator end,
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OutputIterator result,
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__gnu_parallel::_Parallelism parallelism_tag)
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{
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typedef iterator_traits<InputIterator> traits_type;
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typedef typename traits_type::value_type value_type;
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return adjacent_difference(begin, end, result, std::minus<value_type>(),
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parallelism_tag);
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}
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template<typename InputIterator, typename OutputIterator>
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inline OutputIterator
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adjacent_difference(InputIterator begin, InputIterator end,
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OutputIterator result)
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{
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typedef iterator_traits<InputIterator> traits_type;
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typedef typename traits_type::value_type value_type;
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return adjacent_difference(begin, end, result, std::minus<value_type>());
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}
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation>
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inline OutputIterator
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adjacent_difference(InputIterator begin, InputIterator end,
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OutputIterator result, BinaryOperation binary_op,
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__gnu_parallel::_Parallelism parallelism_tag)
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{
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typedef iterator_traits<InputIterator> traitsi_type;
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typedef typename traitsi_type::iterator_category iteratori_category;
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typedef iterator_traits<OutputIterator> traitso_type;
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typedef typename traitso_type::iterator_category iteratoro_category;
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return adjacent_difference_switch(begin, end, result, binary_op,
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iteratori_category(),
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iteratoro_category(), parallelism_tag);
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}
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template<typename InputIterator, typename OutputIterator,
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typename BinaryOperation>
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inline OutputIterator
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adjacent_difference(InputIterator begin, InputIterator end,
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OutputIterator result, BinaryOperation binary_op)
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{
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typedef iterator_traits<InputIterator> traitsi_type;
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typedef typename traitsi_type::iterator_category iteratori_category;
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typedef iterator_traits<OutputIterator> traitso_type;
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typedef typename traitso_type::iterator_category iteratoro_category;
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return adjacent_difference_switch(begin, end, result, binary_op,
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iteratori_category(),
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iteratoro_category());
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}
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} // end namespace
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} // end namespace
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#endif /* _GLIBCXX_NUMERIC_H */
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