From 822c7b0341064c3d0d9b142dc6ce61c66797159a Mon Sep 17 00:00:00 2001
From: Lofty <dan.ravensloft@gmail.com>
Date: Wed, 25 Jan 2023 09:26:58 +0000
Subject: muxcover: do not add decode muxes with x inputs

---
 passes/techmap/muxcover.cc | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

(limited to 'passes/techmap')

diff --git a/passes/techmap/muxcover.cc b/passes/techmap/muxcover.cc
index a90d81985..2656f30ce 100644
--- a/passes/techmap/muxcover.cc
+++ b/passes/techmap/muxcover.cc
@@ -179,7 +179,7 @@ struct MuxcoverWorker
 
 	int prepare_decode_mux(SigBit &A, SigBit B, SigBit sel, SigBit bit)
 	{
-		if (A == B || sel == State::Sx)
+		if (A == B || A == State::Sx || B == State::Sx || sel == State::Sx)
 			return 0;
 
 		tuple<SigBit, SigBit, SigBit> key(A, B, sel);
@@ -197,9 +197,6 @@ struct MuxcoverWorker
 		if (std::get<2>(entry))
 			return 0;
 
-		if (A == State::Sx || B == State::Sx)
-			return 0;
-
 		return cost_dmux / GetSize(std::get<1>(entry));
 	}
 
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