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Using serial_reduce() when reducing on CPU device #491

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Aug 12, 2015
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Using serial_reduce() when reducing on CPU device #491

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18 changes: 7 additions & 11 deletions include/boost/compute/algorithm/reduce.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -198,16 +198,6 @@ inline void generic_reduce(InputIterator first,
}
}

template<class InputIterator, class T>
inline void dispatch_reduce(InputIterator first,
InputIterator last,
const buffer_iterator<T> result,
const plus<T> &function,
command_queue &queue)
{
reduce_on_gpu(first, last, result, function, queue);
}

template<class InputIterator, class OutputIterator, class T>
inline void dispatch_reduce(InputIterator first,
InputIterator last,
Expand All @@ -216,10 +206,16 @@ inline void dispatch_reduce(InputIterator first,
command_queue &queue)
{
const context &context = queue.get_context();
const device &device = queue.get_device();

// reduce to temporary buffer on device
array<T, 1> tmp(context);
dispatch_reduce(first, last, tmp.begin(), function, queue);
if(device.type() & device::cpu){
detail::serial_reduce(first, last, tmp.begin(), function, queue);
}
else {
reduce_on_gpu(first, last, tmp.begin(), function, queue);
}

// copy to result iterator
copy_n(tmp.begin(), 1, result, queue);
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