groupBusPorts callback for endedness

Signed-off-by: James Cherry <cherry@parallaxsw.com>

include/sta/ConcreteLibrary.hh

@@ -117,7 +117,8 @@ public:
 			       ConcretePortSeq *members);
   // Group previously defined bus bit ports together.
   void groupBusPorts(const char bus_brkt_left,
-		     const char bus_brkt_right);
+		     const char bus_brkt_right,
+                     std::function<bool(const char*)> port_big_endian_pred);
   size_t portCount() const;
   void setName(const char *name);
   void addPort(ConcretePort *port);

include/sta/ConcreteNetwork.hh

@@ -176,7 +176,8 @@ public:
 			    const char *name,
 			    int from_index,
 			    int to_index);
-  virtual void groupBusPorts(Cell *cell);
+  virtual void groupBusPorts(Cell *cell,
+                             std::function<bool(const char*)> port_is_big_endian);
   virtual Port *makeBundlePort(Cell *cell,
 			       const char *name,
 			       PortSeq *members);

include/sta/Network.hh

@@ -548,7 +548,8 @@ public:
 			    const char *name,
 			    int from_index,
 			    int to_index) = 0;
-  virtual void groupBusPorts(Cell *cell) = 0;
+  virtual void groupBusPorts(Cell *cell,
+                             std::function<bool(const char*)> port_is_big_endian) = 0;
   virtual Port *makeBundlePort(Cell *cell,
 			       const char *name,
 			       PortSeq *members) = 0;

network/ConcreteLibrary.cc

@@ -375,7 +375,8 @@ typedef Map<const char*, BusPort*, CharPtrLess> BusPortMap;
 
 void
 ConcreteCell::groupBusPorts(const char bus_brkt_left,
-			    const char bus_brkt_right)
+			    const char bus_brkt_right,
+                            std::function<bool(const char*)> port_is_big_endian)
 {
   const char bus_brkts_left[2]{bus_brkt_left, '\0'};
   const char bus_brkts_right[2]{bus_brkt_right, '\0'};
@@ -395,12 +396,8 @@ ConcreteCell::groupBusPorts(const char bus_brkt_left,
     if (bus_name) {
       if (!port->isBusBit()) {
 	BusPort *bus_port = port_map.findKey(bus_name);
-	if (bus_port) {
-	  // Treat it as [max:min]/[from:to], ie downto.
-	  bus_port->setFrom(std::max(index, bus_port->from()));
-	  bus_port->setTo(std::min(index, bus_port->to()));
+	if (bus_port)
 	  stringDelete(bus_name);
-	}
 	else {
 	  bus_port = new BusPort(bus_name, index, port->direction());
 	  port_map[bus_name] = bus_port;
@@ -419,6 +416,7 @@ ConcreteCell::groupBusPorts(const char bus_brkt_left,
   while (bus_iter.hasNext()) {
     BusPort *bus_port = bus_iter.next();
     const char *bus_name = bus_port->name();
+    bool is_big_endian = port_is_big_endian(bus_name);
     ConcretePortSeq *members = bus_port->members();
     sort(members, [&](ConcretePort *port1,
 		      ConcretePort *port2) {
@@ -430,10 +428,21 @@ ConcreteCell::groupBusPorts(const char bus_brkt_left,
 		    parseBusName(port2->name(), bus_brkts_left, bus_brkts_right, escape_,
 				 bus_name, index2);
 		    stringDelete(bus_name);
-		    return index1 > index2;
+		    return is_big_endian ? index1 > index2 : index1 < index2;
 		  });
-    ConcretePort *port = makeBusPort(bus_name, bus_port->from(),
-				     bus_port->to(), members);
+
+    char *bus_name1;
+    int from_index, to_index;
+    parseBusName((*members)[0]->name(),
+                 bus_brkts_left, bus_brkts_right, escape_,
+                 bus_name1, from_index);
+    stringDelete(bus_name1);
+    parseBusName((*members)[members->size() - 1]->name(),
+                 bus_brkts_left, bus_brkts_right, escape_,
+                 bus_name1, to_index);
+    stringDelete(bus_name1);
+
+    ConcretePort *port = makeBusPort(bus_name, from_index, to_index, members);
     port->setDirection(bus_port->direction());
     delete bus_port;
 

network/ConcreteNetwork.cc

@@ -638,12 +638,13 @@ ConcreteNetwork::makeBusPort(Cell *cell,
 }
 
 void
-ConcreteNetwork::groupBusPorts(Cell *cell)
+ConcreteNetwork::groupBusPorts(Cell *cell,
+                               std::function<bool(const char*)> port_is_big_endian)
 {
   Library *lib = library(cell);
   ConcreteLibrary *clib = reinterpret_cast<ConcreteLibrary*>(lib);
   ConcreteCell *ccell = reinterpret_cast<ConcreteCell*>(cell);
-  ccell->groupBusPorts(clib->busBrktLeft(), clib->busBrktRight());
+  ccell->groupBusPorts(clib->busBrktLeft(), clib->busBrktRight(), port_is_big_endian);
 }
 
 Port *