rsz: Use Steiner tree as fallback if w/o parasitics src

Signed-off-by: Martin Povišer <[email protected]>

Author: povik

src/rsz/src/RepairDesign.cc

@@ -1185,6 +1185,13 @@ void RepairDesign::repairNet(Net* net,
     // For tristate nets all we can do is resize the driver.
     if (!resizer_->isTristateDriver(drvr_pin)) {
       BufferedNetPtr bnet = resizer_->makeBufferedNet(drvr_pin, corner);
+
+      if (!bnet) {
+        // Create a Steiner bnet in case we haven't selected a source of
+        // parasitics
+        bnet = resizer_->makeBufferedNetSteiner(drvr_pin, corner);
+      }
+
       if (bnet) {
         int wire_length = bnet->maxLoadWireLength();
         repair_wire

src/rsz/test/repair_wire3.ok

@@ -17,5 +17,7 @@ in1 manhtn 0.7 steiner 0.7 0.00
 Iteration |   Area    | Resized | Buffers | Nets repaired | Remaining
 ---------------------------------------------------------------------
         0 |     +0.0% |       0 |       0 |             0 |         4
-    final |     +0.0% |       0 |       0 |             0 |         0
+    final |   +100.0% |       0 |       3 |             1 |         0
 ---------------------------------------------------------------------
+[INFO RSZ-0037] Found 1 long wires.
+[INFO RSZ-0038] Inserted 3 buffers in 1 nets.