From 2412feec33402035d5070f433482b28f8dc778a7 Mon Sep 17 00:00:00 2001
From: Matt Liberty <mliberty@precisioninno.com>
Date: Tue, 9 Sep 2025 00:04:21 +0000
Subject: [PATCH] pad cells are not buffers or inverters (#294)

Signed-off-by: Matt Liberty <mliberty@precisioninno.com>
---
 liberty/Liberty.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/liberty/Liberty.cc b/liberty/Liberty.cc
index c87093fb..ecf81f24 100644
--- a/liberty/Liberty.cc
+++ b/liberty/Liberty.cc
@@ -1175,7 +1175,8 @@ LibertyCell::isBuffer() const
   bufferPorts(input, output);
   return input && output
     && hasBufferFunc(input, output)
-    && !is_level_shifter_;
+    && !is_level_shifter_
+    && !is_pad_;
 }
 
 bool
@@ -1195,7 +1196,9 @@ LibertyCell::isInverter() const
   LibertyPort *output;
   bufferPorts(input, output);
   return input && output
-    && hasInverterFunc(input, output);
+    && hasInverterFunc(input, output)
+    && !is_level_shifter_
+    && !is_pad_;
 }
 
 bool