back.rtlil: don't emit a slice if all bits are used.

diff --git a/nmigen/back/rtlil.py b/nmigen/back/rtlil.py
index 5641322031f5585807a021c658d79adb1dd26b71..05d4ac646e13bccbe0be8532d680f9875ca03953 100644 (file)
--- a/nmigen/back/rtlil.py
+++ b/nmigen/back/rtlil.py
@@ -273,7 +273,9 @@ class _ValueCompiler(xfrm.AbstractValueTransformer):
         raise NotImplementedError # :nocov:
 
     def on_Slice(self, value):
-        if value.end == value.start + 1:
+        if value.start == 0 and value.end == len(value.value):
+            return self(value.value)
+        elif value.start + 1 == value.end:
             return "{} [{}]".format(self(value.value), value.start)
         else:
             return "{} [{}:{}]".format(self(value.value), value.end - 1, value.start)