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132 lines
3.4 KiB
132 lines
3.4 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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#pragma once
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#include <thrust/detail/config.h>
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#include <thrust/detail/function.h>
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#include <thrust/detail/static_assert.h>
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#include <thrust/iterator/iterator_traits.h>
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#include <thrust/distance.h>
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#include <thrust/reduce.h>
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#include <tbb/blocked_range.h>
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#include <tbb/parallel_reduce.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 tbb
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{
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namespace detail
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{
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namespace reduce_detail
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{
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template<typename RandomAccessIterator,
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typename OutputType,
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typename BinaryFunction>
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struct body
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{
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RandomAccessIterator first;
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OutputType sum;
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bool first_call; // TBB can invoke operator() multiple times on the same body
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thrust::detail::host_function<BinaryFunction,OutputType> binary_op;
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// note: we only initalize sum with init to avoid calling OutputType's default constructor
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body(RandomAccessIterator first, OutputType init, BinaryFunction binary_op)
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: first(first), sum(init), first_call(true), binary_op(binary_op)
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{}
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// note: we only initalize sum with b.sum to avoid calling OutputType's default constructor
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body(body& b, ::tbb::split)
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: first(b.first), sum(b.sum), first_call(true), binary_op(b.binary_op)
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{}
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template <typename Size>
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void operator()(const ::tbb::blocked_range<Size> &r)
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{
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// we assume that blocked_range specifies a contiguous range of integers
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if (r.empty()) return; // nothing to do
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RandomAccessIterator iter = first + r.begin();
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OutputType temp = thrust::raw_reference_cast(*iter);
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++iter;
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for (Size i = r.begin() + 1; i != r.end(); ++i, ++iter)
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temp = binary_op(temp, *iter);
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if (first_call)
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{
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// first time body has been invoked
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first_call = false;
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sum = temp;
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}
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else
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{
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// body has been previously invoked, accumulate temp into sum
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sum = binary_op(sum, temp);
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}
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} // end operator()()
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void join(body& b)
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{
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sum = binary_op(sum, b.sum);
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}
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}; // end body
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} // end reduce_detail
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template<typename DerivedPolicy,
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typename InputIterator,
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typename OutputType,
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typename BinaryFunction>
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OutputType reduce(execution_policy<DerivedPolicy> &exec,
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InputIterator begin,
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InputIterator end,
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OutputType init,
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BinaryFunction binary_op)
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{
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typedef typename thrust::iterator_difference<InputIterator>::type Size;
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Size n = thrust::distance(begin, end);
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if (n == 0)
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{
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return init;
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}
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else
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{
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typedef typename reduce_detail::body<InputIterator,OutputType,BinaryFunction> Body;
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Body reduce_body(begin, init, binary_op);
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::tbb::parallel_reduce(::tbb::blocked_range<Size>(0,n), reduce_body);
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return binary_op(init, reduce_body.sum);
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}
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}
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} // end namespace detail
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} // end namespace tbb
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} // end namespace system
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} // end namespace thrust
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