[Yosys+Odin]: creating extra pins to extend the mult output port

Signed-off-by: Seyed Alireza Damghani <[email protected]>

Author: sdamghan

ODIN_II/SRC/BLIFElaborate.cpp

@@ -485,7 +485,7 @@ static void resolve_arithmetic_nodes(nnode_t* node, uintptr_t traverse_mark_numb
             if (!hard_multipliers)
                 check_constant_multipication(node, traverse_mark_number, netlist);
             else
-                check_multiplier_port_size(node, netlist);
+                check_multiplier_port_size(node);
 
             /* Adding to mult_list for future checking on hard blocks */
             mult_list = insert_in_vptr_list(mult_list, node);

ODIN_II/SRC/include/multipliers.h

@@ -56,7 +56,7 @@ extern void define_mult_function(nnode_t* node, FILE* out);
 extern void split_multiplier(nnode_t* node, int a0, int b0, int a1, int b1, netlist_t* netlist);
 extern void iterate_multipliers(netlist_t* netlist);
 extern bool check_constant_multipication(nnode_t* node, uintptr_t traverse_mark_number, netlist_t* netlist);
-extern void check_multiplier_port_size(nnode_t* node, netlist_t* netlist);
+extern void check_multiplier_port_size(nnode_t* node);
 extern bool is_ast_multiplier(ast_node_t* node);
 extern void clean_multipliers();
 extern void free_multipliers();

ODIN_II/SRC/multipliers.cpp

@@ -1769,10 +1769,9 @@ bool is_ast_multiplier(ast_node_t* node) {
  * we need to expand output pins with pad pins
  * 
  * @param node pointer to the multiplication node
- * @param netlist pointer to the current netlist file
  * -----------------------------------------------------------------------
  */
-void check_multiplier_port_size(nnode_t* node, netlist_t* netlist) {
+void check_multiplier_port_size(nnode_t* node) {
     /* Can only perform the optimisation if hard multipliers exist! */
     if (hard_multipliers == NULL)
         return;
@@ -1795,8 +1794,16 @@ void check_multiplier_port_size(nnode_t* node, netlist_t* netlist) {
         for (int i = 0; i < node->num_output_pins; i++) {
             if (i < sizeout)
                 node->output_pins[i] = old_output_pins[i];
-            else
-                add_output_pin_to_node(node, get_pad_pin(netlist), i);
+            else {
+                npin_t* new_pin = allocate_npin();
+                new_pin->name = append_string("", "%s~dummy_output~%d", node->name, 0);
+                nnet_t* new_net = allocate_nnet();
+
+                // hook the output pin into the node
+                add_output_pin_to_node(node, new_pin, i);
+                // hook up new pin 1 into the new net
+                add_driver_pin_to_net(new_net, new_pin);
+            }
         }
         // CLEAN UP
         vtr::free(old_output_pins);