From c335bad6e933331db64d027237529473b103799d Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Mon, 16 Sep 2024 12:25:35 +0200
Subject: [PATCH] Do not incorporate loops in XLUT

---
 himbaechel/uarch/ng-ultra/pack.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/himbaechel/uarch/ng-ultra/pack.cc b/himbaechel/uarch/ng-ultra/pack.cc
index 29aaf864..aa51b47c 100644
--- a/himbaechel/uarch/ng-ultra/pack.cc
+++ b/himbaechel/uarch/ng-ultra/pack.cc
@@ -355,6 +355,8 @@ void NgUltraPacker::pack_xluts(void)
             if (!net)
                 continue;
             lut[i] = net_driven_by(ctx, net, is_lut, id_O);
+            if (lut[i] == cell.second.get())
+                continue;
             if (lut[i]) {
                 if (net->users.entries()>1) dff_parts_used++;
                 inputs_used++;