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//---------------------------------------------------------------------------//
// Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//
#ifndef BOOST_COMPUTE_ALGORITHM_DETAIL_COPY_ON_DEVICE_HPP
#define BOOST_COMPUTE_ALGORITHM_DETAIL_COPY_ON_DEVICE_HPP
#include <iterator>
#include <boost/compute/command_queue.hpp>
#include <boost/compute/async/future.hpp>
#include <boost/compute/iterator/buffer_iterator.hpp>
#include <boost/compute/iterator/discard_iterator.hpp>
#include <boost/compute/memory/svm_ptr.hpp>
#include <boost/compute/detail/iterator_range_size.hpp>
#include <boost/compute/detail/meta_kernel.hpp>
#include <boost/compute/detail/parameter_cache.hpp>
#include <boost/compute/detail/work_size.hpp>
#include <boost/compute/detail/vendor.hpp>
namespace boost {
namespace compute {
namespace detail {
template<class InputIterator, class OutputIterator>
inline event copy_on_device_cpu(InputIterator first,
OutputIterator result,
size_t count,
command_queue &queue)
{
meta_kernel k("copy");
const device& device = queue.get_device();
k <<
"uint block = " <<
"(uint)ceil(((float)count)/get_global_size(0));\n" <<
"uint index = get_global_id(0) * block;\n" <<
"uint end = min(count, index + block);\n" <<
"while(index < end){\n" <<
result[k.var<uint_>("index")] << '=' <<
first[k.var<uint_>("index")] << ";\n" <<
"index++;\n" <<
"}\n";
k.add_set_arg<const uint_>("count", static_cast<uint_>(count));
size_t global_work_size = device.compute_units();
if(count <= 1024) global_work_size = 1;
return k.exec_1d(queue, 0, global_work_size);
}
template<class InputIterator, class OutputIterator>
inline event copy_on_device_gpu(InputIterator first,
OutputIterator result,
size_t count,
command_queue &queue)
{
typedef typename std::iterator_traits<InputIterator>::value_type input_type;
const device& device = queue.get_device();
boost::shared_ptr<parameter_cache> parameters =
detail::parameter_cache::get_global_cache(device);
std::string cache_key =
"__boost_copy_kernel_" + boost::lexical_cast<std::string>(sizeof(input_type));
uint_ vpt = parameters->get(cache_key, "vpt", 4);
uint_ tpb = parameters->get(cache_key, "tpb", 128);
meta_kernel k("copy");
k <<
"uint index = get_local_id(0) + " <<
"(" << vpt * tpb << " * get_group_id(0));\n" <<
"for(uint i = 0; i < " << vpt << "; i++){\n" <<
" if(index < count){\n" <<
result[k.var<uint_>("index")] << '=' <<
first[k.var<uint_>("index")] << ";\n" <<
" index += " << tpb << ";\n"
" }\n"
"}\n";
k.add_set_arg<const uint_>("count", static_cast<uint_>(count));
size_t global_work_size = calculate_work_size(count, vpt, tpb);
return k.exec_1d(queue, 0, global_work_size, tpb);
}
template<class InputIterator, class OutputIterator>
inline event dispatch_copy_on_device(InputIterator first,
InputIterator last,
OutputIterator result,
command_queue &queue)
{
const size_t count = detail::iterator_range_size(first, last);
if(count == 0){
// nothing to do
return event();
}
const device& device = queue.get_device();
// copy_on_device_cpu() does not work for CPU on Apple platform
// due to bug in its compiler.
// See https://github.com/boostorg/compute/pull/626
if((device.type() & device::cpu) && !is_apple_platform_device(device))
{
return copy_on_device_cpu(first, result, count, queue);
}
return copy_on_device_gpu(first, result, count, queue);
}
template<class InputIterator, class OutputIterator>
inline OutputIterator copy_on_device(InputIterator first,
InputIterator last,
OutputIterator result,
command_queue &queue)
{
dispatch_copy_on_device(first, last, result, queue);
return result + std::distance(first, last);
}
template<class InputIterator>
inline discard_iterator copy_on_device(InputIterator first,
InputIterator last,
discard_iterator result,
command_queue &queue)
{
(void) queue;
return result + std::distance(first, last);
}
template<class InputIterator, class OutputIterator>
inline future<OutputIterator> copy_on_device_async(InputIterator first,
InputIterator last,
OutputIterator result,
command_queue &queue)
{
event event_ = dispatch_copy_on_device(first, last, result, queue);
return make_future(result + std::distance(first, last), event_);
}
#ifdef BOOST_COMPUTE_CL_VERSION_2_0
// copy_on_device() specialization for svm_ptr
template<class T>
inline svm_ptr<T> copy_on_device(svm_ptr<T> first,
svm_ptr<T> last,
svm_ptr<T> result,
command_queue &queue)
{
size_t count = iterator_range_size(first, last);
if(count == 0){
return result;
}
queue.enqueue_svm_memcpy(
result.get(), first.get(), count * sizeof(T)
);
return result + count;
}
template<class T>
inline future<svm_ptr<T> > copy_on_device_async(svm_ptr<T> first,
svm_ptr<T> last,
svm_ptr<T> result,
command_queue &queue)
{
size_t count = iterator_range_size(first, last);
if(count == 0){
return future<svm_ptr<T> >();
}
event event_ = queue.enqueue_svm_memcpy_async(
result.get(), first.get(), count * sizeof(T)
);
return make_future(result + count, event_);
}
#endif // BOOST_COMPUTE_CL_VERSION_2_0
} // end detail namespace
} // end compute namespace
} // end boost namespace
#endif // BOOST_COMPUTE_ALGORITHM_DETAIL_COPY_ON_DEVICE_HPP
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