Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+//---------------------------------------------------------------------------//
+// Copyright (c) 2014 Roshan <thisisroshansmail@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_SEARCH_ALL_HPP
+#define BOOST_COMPUTE_ALGORITHM_DETAIL_SEARCH_ALL_HPP
+
+#include <boost/compute/algorithm/copy.hpp>
+#include <boost/compute/container/vector.hpp>
+#include <boost/compute/detail/iterator_range_size.hpp>
+#include <boost/compute/detail/meta_kernel.hpp>
+#include <boost/compute/lambda.hpp>
+#include <boost/compute/system.hpp>
+
+namespace boost {
+namespace compute {
+namespace detail {
+
+///
+/// \brief Search kernel class
+///
+/// Subclass of meta_kernel which is capable of performing pattern matching
+///
+template<class PatternIterator, class TextIterator, class OutputIterator>
+class search_kernel : public meta_kernel
+{
+public:
+    search_kernel() : meta_kernel("search")
+    {}
+
+    void set_range(PatternIterator p_first,
+                   PatternIterator p_last,
+                   TextIterator t_first,
+                   TextIterator t_last,
+                   OutputIterator result)
+    {
+        m_p_count = iterator_range_size(p_first, p_last);
+        m_p_count_arg = add_arg<uint_>("p_count");
+
+        m_count = iterator_range_size(t_first, t_last);
+        m_count = m_count + 1 - m_p_count;
+
+        *this <<
+            "uint i = get_global_id(0);\n" <<
+            "const uint i1 = i;\n" <<
+            "uint j;\n" <<
+            "for(j = 0; j<p_count; j++,i++)\n" <<
+            "{\n" <<
+            "   if(" << p_first[expr<uint_>("j")] << " != " <<
+                    t_first[expr<uint_>("i")] << ")\n" <<
+            "       j = p_count + 1;\n" <<
+            "}\n" <<
+            "if(j == p_count)\n" <<
+            result[expr<uint_>("i1")] << " = 1;\n" <<
+            "else\n" <<
+            result[expr<uint_>("i1")] << " = 0;\n";
+    }
+
+    event exec(command_queue &queue)
+    {
+        if(m_count == 0) {
+            return event();
+        }
+
+        set_arg(m_p_count_arg, uint_(m_p_count));
+
+        return exec_1d(queue, 0, m_count);
+    }
+
+private:
+    size_t m_p_count;
+    size_t m_p_count_arg;
+    size_t m_count;
+};
+
+} //end detail namespace
+} //end compute namespace
+} //end boost namespace
+
+#endif // BOOST_COMPUTE_ALGORITHM_DETAIL_SEARCH_ALL_HPP