From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Fri, 14 Dec 2012 22:56:16 +0000 (+0100)
Subject: fhdl/tools: bitreverse
X-Git-Tag: 24jan2021_ls180~2099^2~714
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b06fbdedd6bbc3e2fe7db86964bc84a6f10aa811;p=litex.git

fhdl/tools: bitreverse
---

diff --git a/migen/fhdl/tools.py b/migen/fhdl/tools.py
index 186dd8e4..c4af475a 100644
--- a/migen/fhdl/tools.py
+++ b/migen/fhdl/tools.py
@@ -205,3 +205,8 @@ def lower_arrays(f):
 	f2 = al.visit(f)
 	f2.comb += al.comb
 	return f2
+
+def bitreverse(s):
+	length, signed = value_bits_sign(s)
+	l = [s[i] for i in reversed(range(length))]
+	return Cat(*l)