Imported gcc-4.4.3

[msp430-gcc.git] / libstdc++-v3 / testsuite / util / performance / time / timing_test_base.hpp

diff --git a/libstdc++-v3/testsuite/util/performance/time/timing_test_base.hpp b/libstdc++-v3/testsuite/util/performance/time/timing_test_base.hpp
new file mode 100644 (file)
index 0000000..9615832
--- /dev/null
+++ b/libstdc++-v3/testsuite/util/performance/time/timing_test_base.hpp
@@ -0,0 +1,117 @@
+// -*- C++ -*-
+
+// Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the terms
+// of the GNU General Public License as published by the Free Software
+// Foundation; either version 3, or (at your option) any later
+// version.
+
+// This library is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+
+// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
+
+// Permission to use, copy, modify, sell, and distribute this software
+// is hereby granted without fee, provided that the above copyright
+// notice appears in all copies, and that both that copyright notice
+// and this permission notice appear in supporting documentation. None
+// of the above authors, nor IBM Haifa Research Laboratories, make any
+// representation about the suitability of this software for any
+// purpose. It is provided "as is" without express or implied
+// warranty.
+
+/**
+ * @file timing_test_base.hpp
+ * Contains a base class for timing tests.
+ */
+
+#ifndef PB_DS_TIMING_TEST_BASE_HPP
+#define PB_DS_TIMING_TEST_BASE_HPP
+
+#include <performance/time/elapsed_timer.hpp>
+#include <statistic/result_recorder.hpp>
+
+namespace __gnu_pbds
+{
+  namespace test
+  {
+    namespace detail
+    {
+      class timing_test_base
+      {
+      protected:
+       template<typename Functor>
+       double
+       operator()(Functor& fn);
+
+       static double
+        min_time_res();
+
+      private:
+       template<typename Functor>
+       std::size_t
+       get_min_resolution(Functor&);
+
+       template<typename Functor>
+       double
+       run_at_resolution(Functor&, std::size_t);
+      };
+
+      template<typename Functor>
+      double
+      timing_test_base::operator()(Functor& fn)
+      {
+       const std::size_t resolution = get_min_resolution(fn);
+       __gnu_pbds::test::detail::result_recorder<double> rec;
+       double res;
+       do
+         res = run_at_resolution(fn, resolution);
+       while (rec.add_result(res) == false);
+       res = rec.get_sample_mean() / resolution;
+       return res;
+      }
+
+      double
+      timing_test_base::min_time_res()
+      { return 1e-7; }
+
+      template<typename Functor>
+      std::size_t
+      timing_test_base::get_min_resolution(Functor& fn)
+      {
+       std::size_t guess = 0;
+       const double epsilon_val = min_time_res();
+       double res;
+       do
+         {
+           guess = guess * 2 + 1;
+           res = run_at_resolution(fn, guess);
+         }
+       while (res < epsilon_val);
+       return guess;
+      }
+
+      template<typename Functor>
+      double
+      timing_test_base::run_at_resolution(Functor& fn, std::size_t resolution)
+      {
+       elapsed_timer res;
+       fn(resolution);
+       return res;
+      }
+
+    } // namespace detail
+  } // namespace test
+} // namespace __gnu_pbds
+
+#endif 
+