source: trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Prediction_unit/Update_Prediction_Table/src/Update_Prediction_Table_genMealy_decod.cpp @ 123

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

#include "Behavioural/Core/Multi_Front_end/Front_end/Prediction_unit/Update_Prediction_Table/include/Update_Prediction_Table.h"

namespace morpheo                    {
namespace behavioural {
namespace core {
namespace multi_front_end {
namespace front_end {
namespace prediction_unit {
namespace update_prediction_table {


#undef  FUNCTION
#define FUNCTION "Update_Prediction_Table::genMealy_decod"
  void Update_Prediction_Table::genMealy_decod (void)
  {
    log_begin(Update_Prediction_Table,FUNCTION);
    log_function(Update_Prediction_Table,FUNCTION,_name.c_str());
    
    // WARNING : One branch per context per cycle
    if (PORT_READ(in_NRESET) != 0)
      {
    // for each decod instruction
    for (uint32_t i=0; i<_param->_nb_inst_decod; i++)
      {
        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * DECOD [%d]",i);

        // Read information
        Tcontext_t         context          = (_param->_have_port_context_id)?PORT_READ(in_DECOD_CONTEXT_ID [i]):0;
        bool               is_accurate      = (_param->_always_accurate_decod or 
                                              (_param->_can_accurate_decod and reg_IS_ACCURATE [context]));
        upt_event_state_t  upt_event_state  = reg_UPT_EVENT_STATE  [context];
        ufpt_event_state_t ufpt_event_state = reg_UFPT_EVENT_STATE [context];
        uint32_t           ptr_write        = reg_UPT_TOP     [context]; // One branch per context per cycle
        uint32_t           ptr_write_next   = (ptr_write+1)%_param->_size_upt_queue[context];
        // Decod can continue until the next branch if next slot is empty, and no event
        Tcontrol_t         can_continue     = (reg_UPDATE_PREDICTION_TABLE [context][ptr_write_next]._state == UPDATE_PREDICTION_STATE_EMPTY);

        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * context          : %d",context);
        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * is_accurate      : %d",is_accurate);
        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * ufpt_event_state : %s",toString(ufpt_event_state).c_str());
        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * upt_event_state  : %s",toString(upt_event_state).c_str());
        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * ptr_write        : %d - %d",ptr_write,ptr_write_next);
        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * upt_state        : %s",toString(reg_UPDATE_PREDICTION_TABLE [context][ptr_write]._state).c_str());
        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * can_continue     : %d",can_continue);

        // can decod (ack) if :
        //   * in all case (miss or hit), need empty slot
        //   * not previous event (state = ok)
        //   * is_accurate
        internal_DECOD_ACK           [i] = ((reg_UPDATE_PREDICTION_TABLE [context][ptr_write]._state == UPDATE_PREDICTION_STATE_EMPTY) and
                                            (ufpt_event_state == UFPT_EVENT_STATE_OK) and
                                            (upt_event_state  == UPT_EVENT_STATE_OK ) and
                                            is_accurate);
        internal_DECOD_UPT_PTR_WRITE [i] = ptr_write;

        log_printf(TRACE,Update_Prediction_Table,FUNCTION,"  * ack              : %d",internal_DECOD_ACK [i]);

        PORT_WRITE(out_DECOD_ACK          [i], internal_DECOD_ACK [i]);
        PORT_WRITE(out_DECOD_CAN_CONTINUE [i], can_continue);
      }
      }
    else
      {
        // RESET
        for (uint32_t i=0; i<_param->_nb_inst_decod; i++)
          PORT_WRITE(out_DECOD_ACK          [i], 0);
      }

    log_end(Update_Prediction_Table,FUNCTION);
  };

}; // end namespace update_prediction_table
}; // end namespace prediction_unit
}; // end namespace front_end
}; // end namespace multi_front_end
}; // end namespace core

}; // end namespace behavioural
}; // end namespace morpheo              
#endif