From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Fri, 23 Sep 2022 19:12:05 +0000 (+0100)
Subject: put back the barse-ackward decode_bo inversion of {inv||CR_bit}
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a8d36e83162d65f6c89d64ac212b81b655ff648d;p=openpower-isa.git

put back the barse-ackward decode_bo inversion of {inv||CR_bit}
---

diff --git a/src/openpower/sv/trans/svp64.py b/src/openpower/sv/trans/svp64.py
index edd4f2b7..8a6d271a 100644
--- a/src/openpower/sv/trans/svp64.py
+++ b/src/openpower/sv/trans/svp64.py
@@ -666,7 +666,9 @@ def decode_bo(encoding):
     }
     assert encoding in pmap, \
         "encoding %s for BO Mode not recognised" % encoding
-    return pmap[encoding]
+    # barse-ackwards MSB0/LSB0. sigh
+    mapped = pmap[encoding]
+    return int(bin(mapped)[:1:-1], 2) # to 0bNNN, reverse-and-strip b0, base2
 
 
 # partial-decode fail-first mode