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diff --git a/bench/btl/generic_bench/timers/mixed_perf_analyzer.hh b/bench/btl/generic_bench/timers/mixed_perf_analyzer.hh
new file mode 100644
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+++ b/bench/btl/generic_bench/timers/mixed_perf_analyzer.hh
@@ -0,0 +1,73 @@
+//=====================================================
+// File   :  mixed_perf_analyzer.hh
+// Author :  L. Plagne <laurent.plagne@edf.fr)>        
+// Copyright (C) EDF R&D,  mar déc 3 18:59:36 CET 2002
+//=====================================================
+// 
+// This program 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
+// of the License, or (at your option) any later version.
+// 
+// This program 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 program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+// 
+#ifndef _MIXED_PERF_ANALYSER_HH
+#define _MIXED_PERF_ANALYSER_HH
+
+#include "x86_perf_analyzer.hh"
+#include "portable_perf_analyzer.hh"
+
+// choose portable perf analyzer for long calculations and x86 analyser for short ones
+
+
+template<class Action>
+class Mixed_Perf_Analyzer{
+  
+public:  
+  Mixed_Perf_Analyzer( void ):_x86pa(),_ppa(),_use_ppa(true)
+  {
+    MESSAGE("Mixed_Perf_Analyzer Ctor");
+  }; 
+  Mixed_Perf_Analyzer( const Mixed_Perf_Analyzer & ){
+    INFOS("Copy Ctor not implemented");
+    exit(0);
+  };
+  ~Mixed_Perf_Analyzer( void ){
+    MESSAGE("Mixed_Perf_Analyzer Dtor");
+  };
+    
+  
+  inline double eval_mflops(int size)
+  {
+
+    double result=0.0;
+    if (_use_ppa){      
+      result=_ppa.eval_mflops(size);
+      if (_ppa.get_nb_calc()>DEFAULT_NB_SAMPLE){_use_ppa=false;}      
+    }
+    else{      
+      result=_x86pa.eval_mflops(size);
+    }
+
+    return result;
+  }
+
+private:
+
+  Portable_Perf_Analyzer<Action> _ppa;
+  X86_Perf_Analyzer<Action> _x86pa;
+  bool _use_ppa;
+
+};
+
+#endif
+
+  
+    
+