75 lines
2.3 KiB
Plaintext
75 lines
2.3 KiB
Plaintext
|
//---------------------------------------------------------------------------//
|
||
|
|
// 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_REVERSE_HPP
|
||
|
|
#define BOOST_COMPUTE_ALGORITHM_REVERSE_HPP
|
||
|
|
|
||
|
|
#include <boost/compute/system.hpp>
|
||
|
|
#include <boost/compute/command_queue.hpp>
|
||
|
|
#include <boost/compute/detail/meta_kernel.hpp>
|
||
|
|
#include <boost/compute/detail/iterator_range_size.hpp>
|
||
|
|
|
||
|
|
namespace boost {
|
||
|
|
namespace compute {
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
template<class Iterator>
|
||
|
|
struct reverse_kernel : public meta_kernel
|
||
|
|
{
|
||
|
|
reverse_kernel(Iterator first, Iterator last)
|
||
|
|
: meta_kernel("reverse")
|
||
|
|
{
|
||
|
|
typedef typename std::iterator_traits<Iterator>::value_type value_type;
|
||
|
|
|
||
|
|
// store size of the range
|
||
|
|
m_size = detail::iterator_range_size(first, last);
|
||
|
|
add_set_arg<const cl_uint>("size", static_cast<const cl_uint>(m_size));
|
||
|
|
|
||
|
|
*this <<
|
||
|
|
decl<cl_uint>("i") << " = get_global_id(0);\n" <<
|
||
|
|
decl<cl_uint>("j") << " = size - get_global_id(0) - 1;\n" <<
|
||
|
|
decl<value_type>("tmp") << "=" << first[var<cl_uint>("i")] << ";\n" <<
|
||
|
|
first[var<cl_uint>("i")] << "=" << first[var<cl_uint>("j")] << ";\n" <<
|
||
|
|
first[var<cl_uint>("j")] << "= tmp;\n";
|
||
|
|
}
|
||
|
|
|
||
|
|
void exec(command_queue &queue)
|
||
|
|
{
|
||
|
|
exec_1d(queue, 0, m_size / 2);
|
||
|
|
}
|
||
|
|
|
||
|
|
size_t m_size;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // end detail namespace
|
||
|
|
|
||
|
|
/// Reverses the elements in the range [\p first, \p last).
|
||
|
|
///
|
||
|
|
/// \see reverse_copy()
|
||
|
|
template<class Iterator>
|
||
|
|
inline void reverse(Iterator first,
|
||
|
|
Iterator last,
|
||
|
|
command_queue &queue = system::default_queue())
|
||
|
|
{
|
||
|
|
size_t count = detail::iterator_range_size(first, last);
|
||
|
|
if(count < 2){
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
detail::reverse_kernel<Iterator> kernel(first, last);
|
||
|
|
|
||
|
|
kernel.exec(queue);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // end compute namespace
|
||
|
|
} // end boost namespace
|
||
|
|
|
||
|
|
#endif // BOOST_COMPUTE_ALGORITHM_REVERSE_HPP
|