[v3] Add simple string performance test

[Paolo Carlini <pcarlini at suse dot de>]

Hi,

maybe useful for some ongoing work. Committed to mainline.

Paolo.

//////////////
2006-07-13  Paolo Carlini  <pcarlini@suse.de>

	* testsuite/performance/21_strings/string_copy_cons_and_dest.cc: New.

Index: testsuite/performance/21_strings/string_copy_cons_and_dest.cc
===================================================================
--- testsuite/performance/21_strings/string_copy_cons_and_dest.cc	(revision 0)
+++ testsuite/performance/21_strings/string_copy_cons_and_dest.cc	(revision 0)
@@ -0,0 +1,61 @@
+// Copyright (C) 2006 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#include <string>
+#include <testsuite_performance.h>
+
+void benchmark(long len)
+{
+  using namespace std;
+  using namespace __gnu_test;
+
+  time_counter time;
+  resource_counter resource;
+  
+  start_counters(time, resource);
+  string a("1");
+  for (long i = 0; i < len; ++i)
+    {
+      string ss1(a);
+      string ss2(ss1);
+      string ss3(ss2);
+      string ss4(ss3);
+      string ss5(ss4);
+    }
+  stop_counters(time, resource);
+
+  report_performance(__FILE__, "", time, resource);
+  clear_counters(time, resource);
+}
+
+int main()
+{
+  benchmark(1000000);
+  benchmark(10000000);
+  benchmark(100000000);
+  return 0;
+}