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diff --git a/eigen/bench/btl/actions/action_trisolve.hh b/eigen/bench/btl/actions/action_trisolve.hh
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+++ b/eigen/bench/btl/actions/action_trisolve.hh
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+//=====================================================
+// File   :  action_trisolve.hh
+// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
+//=====================================================
+//
+// 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 ACTION_TRISOLVE
+#define ACTION_TRISOLVE
+#include "utilities.h"
+#include "STL_interface.hh"
+#include <string>
+#include "init/init_function.hh"
+#include "init/init_vector.hh"
+#include "init/init_matrix.hh"
+
+using namespace std;
+
+template<class Interface>
+class Action_trisolve {
+
+public :
+
+  // Ctor
+
+  Action_trisolve( int size ):_size(size)
+  {
+    MESSAGE("Action_trisolve Ctor");
+
+    // STL vector initialization
+    init_matrix<pseudo_random>(L_stl,_size);
+    init_vector<pseudo_random>(B_stl,_size);
+    init_vector<null_function>(X_stl,_size);
+    for (int j=0; j<_size; ++j)
+    {
+      for (int i=0; i<j; ++i)
+        L_stl[j][i] = 0;
+      L_stl[j][j] += 3;
+    }
+
+    init_vector<null_function>(resu_stl,_size);
+
+    // generic matrix and vector initialization
+    Interface::matrix_from_stl(L,L_stl);
+    Interface::vector_from_stl(X,X_stl);
+    Interface::vector_from_stl(B,B_stl);
+
+    _cost = 0;
+    for (int j=0; j<_size; ++j)
+    {
+      _cost += 2*j + 1;
+    }
+  }
+
+  // invalidate copy ctor
+
+  Action_trisolve( const  Action_trisolve & )
+  {
+    INFOS("illegal call to Action_trisolve Copy Ctor");
+    exit(1);
+  }
+
+  // Dtor
+
+  ~Action_trisolve( void ){
+
+    MESSAGE("Action_trisolve Dtor");
+
+    // deallocation
+    Interface::free_matrix(L,_size);
+    Interface::free_vector(B);
+    Interface::free_vector(X);
+  }
+
+  // action name
+
+  static inline std::string name( void )
+  {
+    return "trisolve_vector_"+Interface::name();
+  }
+
+  double nb_op_base( void ){
+    return _cost;
+  }
+
+  inline void initialize( void ){
+    //Interface::copy_vector(X_ref,X,_size);
+  }
+
+  inline void calculate( void ) {
+      Interface::trisolve_lower(L,B,X,_size);
+  }
+
+  void check_result(){
+    if (_size>128) return;
+    // calculation check
+    Interface::vector_to_stl(X,resu_stl);
+
+    STL_interface<typename Interface::real_type>::trisolve_lower(L_stl,B_stl,X_stl,_size);
+
+    typename Interface::real_type error=
+      STL_interface<typename Interface::real_type>::norm_diff(X_stl,resu_stl);
+
+    if (error>1.e-4){
+      INFOS("WRONG CALCULATION...residual=" << error);
+      exit(2);
+    } //else INFOS("CALCULATION OK...residual=" << error);
+
+  }
+
+private :
+
+  typename Interface::stl_matrix L_stl;
+  typename Interface::stl_vector X_stl;
+  typename Interface::stl_vector B_stl;
+  typename Interface::stl_vector resu_stl;
+
+  typename Interface::gene_matrix L;
+  typename Interface::gene_vector X;
+  typename Interface::gene_vector B;
+
+  int _size;
+  double _cost;
+};
+
+#endif