pad: dont create empty wires

Signed-off-by: Peter Gadfort <[email protected]>

Author: gadfort

src/pad/src/RDLRouter.cpp

@@ -1603,7 +1603,12 @@ void RDLRouter::writeToDb(odb::dbNet* net,
 {
   Utilities::makeSpecial(net);
 
-  auto* swire = odb::dbSWire::create(net, odb::dbWireType::ROUTED);
+  if (source == nullptr && target == nullptr && stubs.empty()) {
+    // Nothing to create a wire for, so return
+    return;
+  }
+
+  odb::dbSWire* swire = odb::dbSWire::create(net, odb::dbWireType::ROUTED);
   for (const odb::Rect& stub : stubs) {
     odb::dbSBox::create(swire,
                         layer_,

src/pad/test/rdl_route_assignments_overlapping_iterms.defok

@@ -2894,7 +2894,6 @@ SPECIALNETS 141 ;
       NEW metal10 8000 + SHAPE IOWIRE ( 1094590 530540 ) ( 1094590 730540 )
       NEW metal10 8000 + SHAPE IOWIRE ( 1090590 726540 ) ( 1109000 726540 )
       NEW metal10 8000 + SHAPE IOWIRE ( 1105000 722540 ) ( 1105000 795000 )
-      + ROUTED
       + ROUTED metal10 8000 + SHAPE IOWIRE ( 175000 4706540 ) ( 175000 4740000 )
       NEW metal10 8000 + SHAPE IOWIRE ( 171000 4710540 ) ( 202590 4710540 )
       NEW metal10 8000 + SHAPE IOWIRE ( 198590 4690540 ) ( 198590 4714540 )
@@ -3728,8 +3727,7 @@ SPECIALNETS 141 ;
     - p_co2_6_o ( PIN p_co2_6_o ) ( BUMP_0_15 PAD ) ( u_co2_6_o PAD ) + USE SIGNAL
       + ROUTED metal10 10000 + SHAPE IOWIRE ( 175000 5289000 ) ( 175000 5310000 ) ;
     - p_co2_7_o ( PIN p_co2_7_o ) ( BUMP_1_15 PAD ) ( u_co2_7_o PAD ) + USE SIGNAL ;
-    - p_co2_8_o ( PIN p_co2_8_o ) ( BUMP_0_16 PAD ) ( u_co2_8_o PAD ) + USE SIGNAL
-      + ROUTED ;
+    - p_co2_8_o ( PIN p_co2_8_o ) ( BUMP_0_16 PAD ) ( u_co2_8_o PAD ) + USE SIGNAL ;
     - p_co2_clk_o ( PIN p_co2_clk_o ) ( BUMP_3_12 PAD ) ( u_co2_clk_o PAD ) + USE SIGNAL ;
     - p_co2_tkn_i ( PIN p_co2_tkn_i ) ( BUMP_2_13 PAD ) ( u_co2_tkn_i PAD ) + USE SIGNAL ;
     - p_co2_v_o ( PIN p_co2_v_o ) ( BUMP_0_13 PAD ) ( u_co2_v_o PAD ) + USE SIGNAL ;