From: whitequark <whitequark@whitequark.org>
Date: Wed, 2 Jan 2019 18:14:29 +0000 (+0000)
Subject: back.rtlil: translate empty slices correctly.
X-Git-Tag: working~98
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=ef1e0b8d55fd5c957ee9c64518359d8ad8d6b5ce;p=nmigen.git

back.rtlil: translate empty slices correctly.
---

diff --git a/nmigen/back/rtlil.py b/nmigen/back/rtlil.py
index 85856f8..8982f23 100644
--- a/nmigen/back/rtlil.py
+++ b/nmigen/back/rtlil.py
@@ -319,7 +319,9 @@ class _ValueCompiler(xfrm.ValueVisitor):
             return self(value.value)
 
         sigspec = self._prepare_value_for_Slice(value.value)
-        if value.start + 1 == value.end:
+        if value.start == value.end:
+            return "{}"
+        elif value.start + 1 == value.end:
             return "{} [{}]".format(sigspec, value.start)
         else:
             return "{} [{}:{}]".format(sigspec, value.end - 1, value.start)