fix off-by-1 pin index when loading AOI and OAI cells

src/kyupy/techlib.py

@@ -30,8 +30,8 @@ class TechLib:
     def pin_index(kind, pin):
         """Returns a pin list position for a given node kind and pin name."""
         if kind[:3] in ('OAI', 'AOI'):
-            if pin[0] == 'A': return int(pin[1])
-            if pin[0] == 'B': return int(pin[1]) + int(kind[4])
+            if pin[0] == 'A': return int(pin[1]) - 1
+            if pin[0] == 'B': return int(pin[1]) + int(kind[4]) - 1
         for prefix, pins, index in [('HADD', ('B0', 'SO'), 1),
                                     ('MUX21', ('S', 'S0'), 2),
                                     ('MX2', ('S0',), 2),