Changeset 146 for trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Prediction_unit/Direction/Meta_Predictor/Two_Level_Branch_Predictor/src/Two_Level_Branch_Predictor_transition.cpp

Timestamp:

Feb 1, 2011, 9:57:54 PM (13 years ago)

Author:

rosiere

Message:

1) Integration of RegisterFile_Internal_Banked in RegisterFile?
2) Erase "read_write" interface in RegisterFile_Monolithic component
3) Add smith predictor parameters in Load_store_pointer_unit.
4) Fix not statistics flags

File:

• trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Prediction_unit/Direction/Meta_Predictor/Two_Level_Branch_Predictor/src/Two_Level_Branch_Predictor_transition.cpp (modified) (3 diffs)

trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Prediction_unit/Direction/Meta_Predictor/Two_Level_Branch_Predictor/src/Two_Level_Branch_Predictor_transition.cpp

@@ -10 +10 @@
 // #include <assert.h>
 
-namespace morpheo                    {
+namespace morpheo {
 namespace behavioural {
 namespace core {
@@ -77 +77 @@
                         log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION,"  * pht_history (old): %llx",pht_history);
                         
+                        // TODO -> don't change PHT here !
+                        Thistory_t min = 0;
+                        Thistory_t max = _param->_pht_counter_max;
+
                         // PHT : saturation counter
-                        pht_history = (direction==1)?((pht_history<_param->_pht_counter_max)?(pht_history+1):(pht_history)):((pht_history>0)?(pht_history-1):(pht_history));
-                        
+                        switch (_param->_pht_scheme)
+                          {
+                          case PHT_SCHEME_COUNTER :
+                            {
+                              pht_history = (direction==1)?((pht_history<max)?(pht_history+1):(max)):((pht_history>min)?(pht_history-1):(min));
+                              break;
+                            }
+                          case PHT_SCHEME_FSM :
+                            {
+                              Thistory_t down = _param->_pht_threshold_down;
+                              Thistory_t up   = _param->_pht_threshold_up;
+
+                              pht_history = (direction==1)?(((pht_history==max) or (pht_history==up))?(max):(pht_history+1)):(((pht_history==min) or (pht_history==down))?(min):(pht_history-1));
+                              break;
+                            }
+                          default :
+                            {
+                              break;
+                            }
+                          }
+
                         log_printf(TRACE,Two_Level_Branch_Predictor,FUNCTION,"  * pht_history (new): %llx",pht_history);
                         
@@ -169 +192 @@
                       else
                         {
-                          pht_history = (direction==1)?((pht_history<_param->_pht_counter_max)?(pht_history+1):(pht_history)):((pht_history>0)?(pht_history-1):(pht_history));
+                          Thistory_t min = 0;
+                          Thistory_t max = _param->_pht_counter_max;
+                          
+                          // PHT : saturation counter
+                          switch (_param->_pht_scheme)
+                            {
+                            case PHT_SCHEME_COUNTER :
+                              {
+                                //  [ 11 ] -- NT -> [ 10 ] 
+                                //  [    ] <-  T -- [    ]
+                                //                   ^  |
+                                //                   |  |
+                                //                   T NT
+                                //                   |  |
+                                //                   |  V
+                                //  [ 00 ] --  T -> [ 01 ] 
+                                //  [    ] <- NT -- [    ]
+
+                                pht_history = (direction==1)?((pht_history<max)?(pht_history+1):(max)):((pht_history>min)?(pht_history-1):(min));
+                                break;
+                              }
+                            case PHT_SCHEME_FSM :
+                              {
+                                //  [11] -- NT -> [10] 
+                                //  [  ] <-  T -- [  ]
+                                //   ^              |
+                                //   |              |
+                                //   T             NT
+                                //   |              |
+                                //   |              V
+                                //  [00] -- NT -> [00] 
+                                //  [  ] <-  T -- [  ]
+
+                                Thistory_t down = _param->_pht_threshold_down;
+                                Thistory_t up   = _param->_pht_threshold_up;
+                                
+                                pht_history = (direction==1)?(((pht_history==max) or (pht_history==up))?(max):(pht_history+1)):(((pht_history==min) or (pht_history==down))?(min):(pht_history-1));
+                                break;
+                              }
+                            default :
+                              {
+                                break;
+                              }
+                            }
                         }