From c88696d7c74bb9ee0fc3cc20d950624ed39868c6 Mon Sep 17 00:00:00 2001
From: whitequark <cz@m-labs.hk>
Date: Fri, 12 Jul 2019 12:17:18 +0000
Subject: [PATCH] back.pysim: correctly add gtkwave traces for signals with
 decoders.

---
 nmigen/back/pysim.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nmigen/back/pysim.py b/nmigen/back/pysim.py
index a32a967..76ef2d6 100644
--- a/nmigen/back/pysim.py
+++ b/nmigen/back/pysim.py
@@ -849,7 +849,7 @@ class Simulator:
             def add_trace(signal, **kwargs):
                 signal_slot = self._signal_slots[signal]
                 if self._vcd_names[signal_slot] is not None:
-                    if len(signal) > 1:
+                    if len(signal) > 1 and not signal.decoder:
                         suffix = "[{}:0]".format(len(signal) - 1)
                     else:
                         suffix = ""
-- 
2.30.2