Changeset 110 for trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Decod_unit/Decod/src/Decod_genMealy.cpp

Timestamp:

Feb 19, 2009, 5:31:47 PM (15 years ago)

Author:

rosiere

Message:

1) OOO_egine : add stat to depiste low perf source
2) Commit : add stat
3) LSU_Pointer : retire - always ack (else combinatory loop). insert - max nb_inst_memory
4) TopLevel? : add debug_idle_time to stop combinatory loop.
5) Issue_queue : add reexecute_queue, new implementation (routage after issue_queue)
6) Decod / Predictor : add "can_continue"

File:

• trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Decod_unit/Decod/src/Decod_genMealy.cpp (modified) (6 diffs)

trunk/IPs/systemC/processor/Morpheo/Behavioural/Core/Multi_Front_end/Front_end/Decod_unit/Decod/src/Decod_genMealy.cpp

@@ -43 +43 @@
 
     Tcontrol_t can_continue      [_param->_nb_context];
-//     Tcontrol_t can_continue_next [_param->_nb_context];
-//     Tcontrol_t have_decod_branch [_param->_nb_context];
+    Tcontrol_t have_decod_branch [_param->_nb_context];
 
     for (uint32_t i=0; i<_param->_nb_context; i++)
@@ -53 +52 @@
         
         can_continue                      [i] = PORT_READ(in_CONTEXT_DECOD_ENABLE [i]);
-//      can_continue_next                 [i] = PORT_READ(in_CONTEXT_DECOD_ENABLE [i]);
-//         have_decod_branch                 [i] = false;
+        have_decod_branch                 [i] = false;
       }
     
@@ -80 +78 @@
                 log_printf(TRACE,Decod,FUNCTION,"  * IFETCH [%d][%d]",x,y);    
                 log_printf(TRACE,Decod,FUNCTION,"    * decod_ack [%d] : %d",i,PORT_READ(in_DECOD_ACK [i]));
-
-//              can_continue [x] = can_continue_next [x];
 
                 decod_val  [i]    = true;                        // fetch_val and decod_enable 
@@ -131 +127 @@
 
                 Ttype_t      type      = _decod_instruction->_type;
-                Tdepth_t     depth     = (_param->_have_port_depth)?PORT_READ(in_CONTEXT_DEPTH [x]):0; // DEPTH_CURRENT
-
+                // Depth current. If have decod a branch and i can continue : depth = depth_next
+                Tdepth_t     depth     = (_param->_have_port_depth)?PORT_READ(in_CONTEXT_DEPTH [x]):0;
+
+                if ((_param->_nb_branch_speculated[x] > 0) and have_decod_branch [x])
+                  depth = (depth+1)%_param->_nb_branch_speculated[x];
+                
                 if (_param->_have_port_context_id)
                 PORT_WRITE(out_DECOD_CONTEXT_ID    [i], x);
@@ -179 +179 @@
                     log_printf(TRACE,Decod,FUNCTION,"      * address dest : %.8x (%.8x)",_decod_instruction->_address_next,_decod_instruction->_address_next<<2);
                     
-                    predict_val [i]     = ifetch_ack  [x][y] // and decod_val [i]
+                    // test if have already decod an branch : one branch per context
+                    predict_val [i]     = not have_decod_branch [x] and ifetch_ack  [x][y] // and decod_val [i]
                       ;
-                    decod_val   [i]    &= PORT_READ(in_PREDICT_ACK [i]);// predict_ack and fetch_val and decod_enable               
-                    ifetch_ack  [x][y] &= PORT_READ(in_PREDICT_ACK [i]);// predict_ack and fetch_val and decod_enable and decod_ack
+                    decod_val   [i]    &= not have_decod_branch [x] and PORT_READ(in_PREDICT_ACK [i]);// predict_ack and fetch_val and decod_enable                 
+                    ifetch_ack  [x][y] &= not have_decod_branch [x] and PORT_READ(in_PREDICT_ACK [i]);// predict_ack and fetch_val and decod_enable and decod_ack
                 
                     if (_param->_have_port_context_id)
@@ -196 +197 @@
                     PORT_WRITE(out_PREDICT_ADDRESS_DEST                [i],_decod_instruction->_address_next      );
                 
-                    //can_continue_next [x] = PORT_READ(in_PREDICT_CAN_CONTINUE [i]); // can continue is set if direction is "not take" (also, continue is sequential order)
-                    can_continue [x] = false; // one branch per context, the DS don't execute
-//                  can_continue_next [x] = false; // one branch per context, the DS don't execute
-//                     have_decod_branch [x] = true;
+                    // can continue is set if direction is "not take" (also, continue is sequential order)
+
+//                  can_continue [x] = false; // one branch per context, the DS don't execute
+                    can_continue [x]&= PORT_READ(in_PREDICT_CAN_CONTINUE [i]); // one branch per context, the DS don't execute
+                    have_decod_branch [x] = true;
                   }