From b42136aa8cac243f6875bf4b18e86c69c2d60bc0 Mon Sep 17 00:00:00 2001
From: "Emil J. Tywoniak" <emil@tywoniak.eu>
Date: Tue, 17 Mar 2026 16:37:00 +0100
Subject: [PATCH] signorm: remove $input cells when leaving

---
 kernel/rtlil_bufnorm.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/rtlil_bufnorm.cc b/kernel/rtlil_bufnorm.cc
index f7105734d..baa9e884f 100644
--- a/kernel/rtlil_bufnorm.cc
+++ b/kernel/rtlil_bufnorm.cc
@@ -327,6 +327,13 @@ void RTLIL::Design::sigNormalize(bool enable)
 				wire->driverCell_ = nullptr;
 				wire->driverPort_ = IdString();
 			}
+
+			// TODO inefficient?
+			std::vector<Cell*> cells_snapshot = module->cells();
+			for (auto cell : cells_snapshot) {
+				if (cell->type == ID($input_port))
+					module->remove(cell);
+			}
 		}
 
 		flagSigNormalized = false;