From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Fri, 24 Jul 2015 10:48:51 +0000 (+0200)
Subject: migen/fhdl/tools: fix rename_clock_domain when new == old
X-Git-Tag: 24jan2021_ls180~2099^2~36
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1f1ff5a5e968b5b6078bc846671fab5b9a137435;p=litex.git

migen/fhdl/tools: fix rename_clock_domain when new == old

Clock domain renaming should support new == old to allow programmatically determined clock domain renaming.
---

diff --git a/migen/fhdl/tools.py b/migen/fhdl/tools.py
index 9a6c3a66..685f4df3 100644
--- a/migen/fhdl/tools.py
+++ b/migen/fhdl/tools.py
@@ -256,12 +256,13 @@ def rename_clock_domain_expr(f, old, new):
 
 def rename_clock_domain(f, old, new):
     rename_clock_domain_expr(f, old, new)
-    if old in f.sync:
-        if new in f.sync:
-            f.sync[new].extend(f.sync[old])
-        else:
-            f.sync[new] = f.sync[old]
-        del f.sync[old]
+    if new != old:
+        if old in f.sync:
+            if new in f.sync:
+                f.sync[new].extend(f.sync[old])
+            else:
+                f.sync[new] = f.sync[old]
+            del f.sync[old]
     for special in f.specials:
         special.rename_clock_domain(old, new)
     try: