summaryrefslogtreecommitdiff
path: root/boost/compute/algorithm/detail/find_extrema.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'boost/compute/algorithm/detail/find_extrema.hpp')
-rw-r--r--boost/compute/algorithm/detail/find_extrema.hpp64
1 files changed, 64 insertions, 0 deletions
diff --git a/boost/compute/algorithm/detail/find_extrema.hpp b/boost/compute/algorithm/detail/find_extrema.hpp
new file mode 100644
index 0000000000..6e756c3904
--- /dev/null
+++ b/boost/compute/algorithm/detail/find_extrema.hpp
@@ -0,0 +1,64 @@
+//---------------------------------------------------------------------------//
+// 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_FIND_EXTREMA_HPP
+#define BOOST_COMPUTE_ALGORITHM_DETAIL_FIND_EXTREMA_HPP
+
+#include <boost/compute/detail/iterator_range_size.hpp>
+#include <boost/compute/algorithm/detail/find_extrema_with_reduce.hpp>
+#include <boost/compute/algorithm/detail/find_extrema_with_atomics.hpp>
+#include <boost/compute/algorithm/detail/serial_find_extrema.hpp>
+
+namespace boost {
+namespace compute {
+namespace detail {
+
+template<class InputIterator, class Compare>
+inline InputIterator find_extrema(InputIterator first,
+ InputIterator last,
+ Compare compare,
+ const bool find_minimum,
+ command_queue &queue)
+{
+ size_t count = iterator_range_size(first, last);
+
+ // handle trivial cases
+ if(count == 0 || count == 1){
+ return first;
+ }
+
+ const device &device = queue.get_device();
+
+ // use serial method for small inputs
+ // and when device is a CPU
+ if(count < 512 || (device.type() & device::cpu)){
+ return serial_find_extrema(first, last, compare, find_minimum, queue);
+ }
+
+ // find_extrema_with_reduce() is used only if requirements are met
+ if(find_extrema_with_reduce_requirements_met(first, last, queue))
+ {
+ return find_extrema_with_reduce(first, last, compare, find_minimum, queue);
+ }
+
+ // use serial method for OpenCL version 1.0 due to
+ // problems with atomic_cmpxchg()
+ #ifndef CL_VERSION_1_1
+ return serial_find_extrema(first, last, compare, find_minimum, queue);
+ #endif
+
+ return find_extrema_with_atomics(first, last, compare, find_minimum, queue);
+}
+
+} // end detail namespace
+} // end compute namespace
+} // end boost namespace
+
+#endif // BOOST_COMPUTE_ALGORITHM_DETAIL_FIND_EXTREMA_HPP