From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Thu, 22 Jul 2021 14:24:36 +0000 (+0100)
Subject: copy of halfrev2 algorithm updated
X-Git-Tag: xlen-bcd~234
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5158c567392c82753ce3a477b6b1b631b577bad1;p=openpower-isa.git

copy of halfrev2 algorithm updated
---

diff --git a/src/openpower/decoder/isa/remap_dct_yield.py b/src/openpower/decoder/isa/remap_dct_yield.py
index eaaeaf89..44a43753 100644
--- a/src/openpower/decoder/isa/remap_dct_yield.py
+++ b/src/openpower/decoder/isa/remap_dct_yield.py
@@ -36,8 +36,7 @@ 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