source: trunk/IPs/systemC/processor/Morpheo/Behavioural/Stage_1_Ifetch/Predictor/Meta_Predictor/Meta_Predictor_Glue/src/Meta_Predictor_Glue_genMealy_predict_history.cpp @ 5

#ifdef SYSTEMC
/*
 * $Id$
 *
 * [ Description ]
 * 
 */

#include "Behavioural/Stage_1_Ifetch/Predictor/Meta_Predictor/Meta_Predictor_Glue/include/Meta_Predictor_Glue.h"

namespace morpheo                    {
namespace behavioural {
namespace stage_1_ifetch {
namespace predictor {
namespace meta_predictor {
namespace meta_predictor_glue {


  void Meta_Predictor_Glue::genMealy_predict_history (void)
  {
    log_printf(FUNC,Meta_Predictor_Glue,"genMealy_predict_history","Begin");
    
    for (uint32_t i=0; i<_param._nb_prediction; i++)
      {
        Thistory_t     history = 0;
        Tpht_history_t predictor_0_pht_history  =0, predictor_1_pht_history  =0, predictor_2_pht_history  =0;
        Tbht_history_t predictor_0_bht_history  =0, predictor_1_bht_history  =0, predictor_2_bht_history  =0;
        Tcontrol_t     predictor_0_pht_direction=0, predictor_1_pht_direction=0, predictor_2_pht_direction=0;
        Tcontrol_t     predictor_0_bht_direction=0, predictor_1_bht_direction=0, predictor_2_bht_direction=0;
        Tcontrol_t     predictor_0_direction,     predictor_1_direction,     predictor_2_direction;
        Tcontrol_t     predictor_direction;

        if (_param._predictor_2_have_pht)
          {
        predictor_2_pht_history   = PORT_READ(in_PREDICT_PREDICTOR_2_PHT_HISTORY [i]);
        predictor_2_pht_direction = predictor_2_pht_history >> (_param._predictor_2_pht_size_counter-1);
        history                  |= (predictor_2_pht_history << _param._shift_5);
          }
        if (_param._predictor_2_have_bht)
          {
        predictor_2_bht_history   = PORT_READ(in_PREDICT_PREDICTOR_2_BHT_HISTORY [i]);
        predictor_2_bht_direction = predictor_2_bht_history >> (_param._predictor_2_bht_size_shifter-1);
        history                  |= (predictor_2_bht_history << _param._shift_4);
          }

        predictor_2_direction = (_param._predictor_2_have_pht==true)?predictor_2_pht_direction:predictor_2_bht_direction;

        if (_param._have_meta_predictor)
          {
        if (_param._predictor_1_have_pht)
          {
        predictor_1_pht_history   = PORT_READ(in_PREDICT_PREDICTOR_1_PHT_HISTORY [i]);
        predictor_1_pht_direction = predictor_1_pht_history >> (_param._predictor_1_pht_size_counter-1);
        history                  |= (predictor_1_pht_history << _param._shift_3);
          }
        if (_param._predictor_1_have_bht)
          {
        predictor_1_bht_history   = PORT_READ(in_PREDICT_PREDICTOR_1_BHT_HISTORY [i]);
        predictor_1_bht_direction = predictor_1_bht_history >> (_param._predictor_1_bht_size_shifter-1);
        history                  |= (predictor_1_bht_history << _param._shift_2) ;
          }
        if (_param._predictor_0_have_pht)
          {
        predictor_0_pht_history   = PORT_READ(in_PREDICT_PREDICTOR_0_PHT_HISTORY [i]);
        predictor_0_pht_direction = predictor_0_pht_history >> (_param._predictor_0_pht_size_counter-1);
        history                  |= (predictor_0_pht_history << _param._shift_1);
          }
        if (_param._predictor_0_have_bht)
          {
        predictor_0_bht_history   = PORT_READ(in_PREDICT_PREDICTOR_0_BHT_HISTORY [i]);
        predictor_0_bht_direction = predictor_0_bht_history >> (_param._predictor_0_bht_size_shifter-1);
        history                  |= (predictor_0_bht_history << _param._shift_0);
          }

        predictor_0_direction = (_param._predictor_0_have_pht==true)?predictor_0_pht_direction:predictor_0_bht_direction;
        predictor_1_direction = (_param._predictor_1_have_pht==true)?predictor_1_pht_direction:predictor_1_bht_direction;

        // Meta predictor : take direction of prediction_2 and select the good predictor.
        predictor_direction   = (predictor_2_direction==0)?predictor_0_direction:predictor_1_direction;
        
        log_printf(TRACE,Meta_Predictor_Glue,"genMealy_predict_history","predict_direction = %d - predictor(_0 %d, _1 %d, _2 %d)",predictor_direction,predictor_0_direction,predictor_1_direction,predictor_2_direction);
          }
        else
          {
        predictor_direction   =  predictor_2_direction;
        log_printf(TRACE,Meta_Predictor_Glue,"genMealy_predict_history","predict_direction = %d - predictor_2 %d",predictor_direction,predictor_2_direction);
          }

        PORT_WRITE(out_PREDICT_DIRECTION [i], predictor_direction);
        PORT_WRITE(out_PREDICT_HISTORY   [i], history            );
      }

    log_printf(FUNC,Meta_Predictor_Glue,"genMealy_predict_history","End");
  };

}; // end namespace meta_predictor_glue
}; // end namespace meta_predictor
}; // end namespace predictor
}; // end namespace stage_1_ifetch
}; // end namespace behavioural
}; // end namespace morpheo              
#endif