obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
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4 files changed, 332 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/util/statistic/result_recorder.hpp b/libstdc++-v3/testsuite/util/statistic/result_recorder.hpp
new file mode 100644
index 000000000..fd638e22e
--- /dev/null
+++ b/libstdc++-v3/testsuite/util/statistic/result_recorder.hpp
@@ -0,0 +1,98 @@
+// -*- 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 result_recorder.hpp
+ * Contains a class for recording results
+ */
+
+#ifndef PB_DS_RES_RECORDER_HPP
+#define PB_DS_RES_RECORDER_HPP
+
+#include <statistic/sample_mean.hpp>
+#include <statistic/sample_variance.hpp>
+#include <statistic/sample_mean_confidence_checker.hpp>
+
+namespace __gnu_pbds
+{
+  namespace test
+  {
+    namespace detail
+    {
+      /*
+       * Records results until the probability that the sample mean is 10% away
+       * from the true mean is ~ 0.05.
+       */
+      template<typename Value_Type>
+      class result_recorder
+      {
+      public:
+	typedef Value_Type value_type;
+
+	result_recorder()
+        : m_sample_mean(value_type()), m_sample_var(value_type())
+	{ }
+
+	bool
+        add_result(value_type res);
+
+	inline value_type
+        get_sample_mean() const
+	{ return m_sample_mean; }
+
+      private:
+	typedef std::list<value_type> list_type;
+
+	list_type m_l;
+	value_type m_sample_mean;
+	value_type m_sample_var;
+      };
+
+
+      template<typename Value_Type>
+      bool
+      result_recorder<Value_Type>::
+      add_result(value_type res)
+      {
+	m_l.push_back(res);
+	m_sample_mean = sample_mean(m_l.begin(), m_l.end());
+	m_sample_var = sample_variance(m_l.begin(), m_l.end(), m_sample_mean);
+
+	size_t dist = std::distance(m_l.begin(), m_l.end());
+	return sample_mean_confidence_checker(m_sample_mean, m_sample_var,
+					      dist, 0.1);
+      }
+    } // namespace detail
+  } // namespace test
+} // namespace __gnu_pbds
+
+#endif 
+
diff --git a/libstdc++-v3/testsuite/util/statistic/sample_mean.hpp b/libstdc++-v3/testsuite/util/statistic/sample_mean.hpp
new file mode 100644
index 000000000..8dfdab8e2
--- /dev/null
+++ b/libstdc++-v3/testsuite/util/statistic/sample_mean.hpp
@@ -0,0 +1,69 @@
+// -*- 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 sample_mean.hpp
+ * Contains a function for calculating a sample mean
+ */
+
+#ifndef PB_DS_SAMPLE_MEAN_HPP
+#define PB_DS_SAMPLE_MEAN_HPP
+
+#include <list>
+#include <numeric>
+#include <math.h>
+#include <iterator>
+
+namespace __gnu_pbds
+{
+  namespace test
+  {
+    namespace detail
+    {
+#define PB_DS_VTYPE typename std::iterator_traits<It>::value_type
+
+      template<typename It>
+      PB_DS_VTYPE
+      sample_mean(It b, It e)
+      {
+	const PB_DS_VTYPE total = std::accumulate(b, e, PB_DS_VTYPE(0));
+	const size_t num = std::distance(b, e);
+	return total / num;
+      }
+
+#undef PB_DS_VTYPE
+
+    } // namespace detail
+  } // namespace test
+} // namespace __gnu_pbds
+
+#endif 
+
diff --git a/libstdc++-v3/testsuite/util/statistic/sample_mean_confidence_checker.hpp b/libstdc++-v3/testsuite/util/statistic/sample_mean_confidence_checker.hpp
new file mode 100644
index 000000000..d63f34bcb
--- /dev/null
+++ b/libstdc++-v3/testsuite/util/statistic/sample_mean_confidence_checker.hpp
@@ -0,0 +1,84 @@
+// -*- 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 sample_mean_confidence_checker.hpp
+ * Contains a function for checking the confidence of a sample mean
+ */
+
+#ifndef PB_DS_SAMPLE_MEAN_CONFIDENCE_CHECKER_HPP
+#define PB_DS_SAMPLE_MEAN_CONFIDENCE_CHECKER_HPP
+
+#include <list>
+#include <numeric>
+#include <math.h>
+
+namespace __gnu_pbds
+{
+  namespace test
+  {
+    namespace detail
+    {
+      /*
+       * Checks that a sample mean sm is in the relative interval
+       * relative_interval of a true mean (assuming i.i.d. samples),
+       * given a sample variance sv taken over num_samples samples,
+       * with confidence ~ 0.95.
+       *
+       * See "Probability, Random Variables, and Stochastic Processes"
+       * (Third edition) Athanasios Papoulis, Chapter 9.
+       */
+      template<typename Value_Type>
+      bool
+      sample_mean_confidence_checker(Value_Type sm, Value_Type sv, 
+				     std::size_t num_samples, 
+				     double relative_interval)
+      {
+	enum
+	  {
+	    // Ensures that the student-t distribution is approximately normal.
+	    min_num_samples = 30
+	  };
+
+	if (num_samples < min_num_samples)
+	  return (false);
+
+	// This is z_u (normal-dist percentile) for u = 0.975.
+	const Value_Type z = 1.976;
+
+	return (sv / ::sqrt(double(num_samples)) <= relative_interval * sm / z);
+      }
+    } // namespace detail
+  } // namespace test
+} // namespace __gnu_pbds
+
+#endif 
+
diff --git a/libstdc++-v3/testsuite/util/statistic/sample_variance.hpp b/libstdc++-v3/testsuite/util/statistic/sample_variance.hpp
new file mode 100644
index 000000000..ed61d0b05
--- /dev/null
+++ b/libstdc++-v3/testsuite/util/statistic/sample_variance.hpp
@@ -0,0 +1,81 @@
+// -*- 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 sample_variance.hpp
+ * Contains a function for calculating a sample variance
+ */
+
+#ifndef PB_DS_SAMPLE_VAR_HPP
+#define PB_DS_SAMPLE_VAR_HPP
+
+#include <list>
+#include <numeric>
+#include <math.h>
+#include <iterator>
+
+namespace __gnu_pbds
+{
+  namespace test
+  {
+    namespace detail
+    {
+#define PB_DS_VTYPE typename std::iterator_traits<It>::value_type
+
+      template<typename It>
+      PB_DS_VTYPE
+      sample_variance(It b, It e, PB_DS_VTYPE sm)
+      {
+	PB_DS_VTYPE ss = 0;
+	size_t num_res = 0;
+
+	while (b != e)
+	  {
+	    const PB_DS_VTYPE d =* b - sm;
+	    ss += d*  d;
+	    ++num_res;
+	    ++b;
+	  }
+
+	if (num_res == 1)
+	  return 0;
+
+	return ::sqrt(ss / (num_res - 1));
+      }
+
+#undef PB_DS_VTYPE
+
+    } // namespace detail
+  } // namespace test
+} // namespace __gnu_pbds
+
+#endif 
+