From 8a0759602983254d13f91196ec977f3dbccfaf05 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Thu, 22 Jul 2021 15:24:00 +0100
Subject: [PATCH] simplification of halfrev2 algorithm (really neat)

---
 src/openpower/decoder/isa/fastdctlee.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/openpower/decoder/isa/fastdctlee.py b/src/openpower/decoder/isa/fastdctlee.py
index f9f481b7..f2641461 100644
--- a/src/openpower/decoder/isa/fastdctlee.py
+++ b/src/openpower/decoder/isa/fastdctlee.py
@@ -102,8 +102,7 @@ def halfrev2(vec, pre_rev=True):
             ri = i
             bl = i.bit_length()
             for ji in range(1, bl):
-                if (1<<ji) & i:
-                    ri ^= ((1<<ji)-1)
+                ri ^= (i >> ji)
             res.append(vec[ri])
     return res
 
-- 
2.30.2