From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Tue, 28 Sep 2021 12:14:10 +0000 (+0100)
Subject: remove Mux Value.cast before passing to 1st argument __Mux__
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3df28b89fb027baba85396e52762b5d766fb0a8b;p=nmigen.git

remove Mux Value.cast before passing to 1st argument __Mux__
only one case requires Mux to perform Value.cast, which is when the sel
argument is a python bool
---

diff --git a/nmigen/hdl/ast.py b/nmigen/hdl/ast.py
index 9ddc717..6a1a05e 100644
--- a/nmigen/hdl/ast.py
+++ b/nmigen/hdl/ast.py
@@ -732,9 +732,8 @@ class Operator(Value):
 
 
 def Mux(sel, val1, val0):
-    sel = Value.cast(sel)
-    if len(sel) != 1:
-        sel = sel.bool()
+    if isinstance(sel, bool): # one instance where Mux is passed an actual bool
+        sel = Value.cast(sel)
     return sel.__Mux__(val1, val0)