re PR libstdc++/58437 (Sorting value in reverse order is much slower compare to gcc44)

2013-09-30  Chris Jefferson  <chris@bubblescope.net>

	PR libstdc++/58437
	* include/bits/stl_algo.h (__move_median_first): Rename to
	__move_median_to_first, change to take an addition argument.
	(__unguarded_partition_pivot): Adjust.
	* testsuite/performance/25_algorithms/sort.cc: New.
	* testsuite/performance/25_algorithms/sort_heap.cc: Likewise.
	* testsuite/performance/25_algorithms/stable_sort.cc: Likewise.

From-SVN: r203035

3 files changed, 203 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/performance/25_algorithms/sort.cc b/libstdc++-v3/testsuite/performance/25_algorithms/sort.cc
new file mode 100644
index 00000000000..07062ab8b3f
--- /dev/null
+++ b/libstdc++-v3/testsuite/performance/25_algorithms/sort.cc
@@ -0,0 +1,65 @@
+// Copyright (C) 2013 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/>.
+
+#include <vector>
+#include <algorithm>
+#include <testsuite_performance.h>
+
+int main()
+{
+  using namespace __gnu_test;
+
+  time_counter time;
+  resource_counter resource;
+
+  const int max_size = 10000000;
+
+  std::vector<int> v(max_size);
+
+  for (int i = 0; i < max_size; ++i)
+    v[i] = -i;
+
+  start_counters(time, resource);
+  std::sort(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "reverse", time, resource);
+  clear_counters(time, resource);
+
+  for (int i = 0; i < max_size; ++i)
+    v[i] = i;
+
+  start_counters(time, resource);
+  std::sort(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "forwards", time, resource);
+  clear_counters(time, resource);
+
+  // a simple psuedo-random series which does not rely on rand() and friends
+  v[0] = 0;
+  for (int i = 1; i < max_size; ++i)
+    v[i] = (v[i-1] + 110211473) * 745988807;
+
+  start_counters(time, resource);
+  std::sort(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "random", time, resource);
+
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/performance/25_algorithms/sort_heap.cc b/libstdc++-v3/testsuite/performance/25_algorithms/sort_heap.cc
new file mode 100644
index 00000000000..63cb2248033
--- /dev/null
+++ b/libstdc++-v3/testsuite/performance/25_algorithms/sort_heap.cc
@@ -0,0 +1,73 @@
+// Copyright (C) 2013 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/>.
+
+#include <vector>
+#include <algorithm>
+#include <testsuite_performance.h>
+
+int main()
+{
+  using namespace __gnu_test;
+
+  time_counter time;
+  resource_counter resource;
+
+  const int max_size = 10000000;
+
+  std::vector<int> v(max_size);
+
+  for (int i = 0; i < max_size; ++i)
+    v[i] = -i;
+
+  start_counters(time, resource);
+  std::make_heap(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "make_heap_reverse", time, resource);
+  clear_counters(time, resource);
+
+  for (int i = 0; i < max_size; ++i)
+    v[i] = i;
+
+  start_counters(time, resource);
+  std::make_heap(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "make_heap_forwards", time, resource);
+  clear_counters(time, resource);
+
+  // a simple psuedo-random series which does not rely on rand() and friends
+  v[0] = 0;
+  for (int i = 1; i < max_size; ++i)
+    v[i] = (v[i-1] + 110211473) * 745988807;
+
+  start_counters(time, resource);
+  std::make_heap(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "make_heap_random", time, resource);
+
+
+  start_counters(time, resource);
+  std::sort_heap(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "sort_heap", time, resource);
+  clear_counters(time, resource);
+
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/performance/25_algorithms/stable_sort.cc b/libstdc++-v3/testsuite/performance/25_algorithms/stable_sort.cc
new file mode 100644
index 00000000000..6440eb35f8f
--- /dev/null
+++ b/libstdc++-v3/testsuite/performance/25_algorithms/stable_sort.cc
@@ -0,0 +1,65 @@
+// Copyright (C) 2013 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/>.
+
+#include <vector>
+#include <algorithm>
+#include <testsuite_performance.h>
+
+int main()
+{
+  using namespace __gnu_test;
+
+  time_counter time;
+  resource_counter resource;
+
+  const int max_size = 10000000;
+
+  std::vector<int> v(max_size);
+
+  for (int i = 0; i < max_size; ++i)
+    v[i] = -i;
+
+  start_counters(time, resource);
+  std::stable_sort(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "reverse", time, resource);
+  clear_counters(time, resource);
+
+  for (int i = 0; i < max_size; ++i)
+    v[i] = i;
+
+  start_counters(time, resource);
+  std::stable_sort(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "forwards", time, resource);
+  clear_counters(time, resource);
+
+  // a simple psuedo-random series which does not rely on rand() and friends
+  v[0] = 0;
+  for (int i = 1; i < max_size; ++i)
+    v[i] = (v[i-1] + 110211473) * 745988807;
+
+  start_counters(time, resource);
+  std::stable_sort(v.begin(), v.end());
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "random", time, resource);
+
+  return 0;
+}