From 9e666c727f83f37ae88a86139fe4fd737392ec88 Mon Sep 17 00:00:00 2001
From: abhinavputhran <aputhran@andrew.cmu.edu>
Date: Fri, 6 Mar 2026 10:37:59 -0500
Subject: [PATCH] setundef: respect selection in -undriven mode

---
 passes/cmds/setundef.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/passes/cmds/setundef.cc b/passes/cmds/setundef.cc
index ecbada2f8..5d9a7d1cb 100644
--- a/passes/cmds/setundef.cc
+++ b/passes/cmds/setundef.cc
@@ -310,6 +310,8 @@ struct SetundefPass : public Pass {
 
 					RTLIL::SigSpec sig = undriven_signals.export_all();
 					for (auto &c : sig.chunks()) {
+						if (!design->selected(module, c.wire))
+							continue;
 						RTLIL::Wire * wire;
 						if (c.wire->width == c.width) {
 							wire = c.wire;
@@ -343,6 +345,8 @@ struct SetundefPass : public Pass {
 
 					RTLIL::SigSpec sig = undriven_signals.export_all();
 					for (auto &c : sig.chunks()) {
+						if (!design->selected(module, c.wire))
+							continue;
 						RTLIL::SigSpec bits;
 						if (worker.next_bit_mode == MODE_ANYSEQ)
 							bits = module->Anyseq(NEW_ID, c.width);