From 6bb55b71bd6020955bc38fe6297899a91db1bf9c Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sat, 3 Sep 2022 17:37:47 +0100
Subject: [PATCH] MSB0-order, xomask 31-start

---
 src/openpower/decoder/power_table.py | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/openpower/decoder/power_table.py b/src/openpower/decoder/power_table.py
index da35cdb8..6511221c 100644
--- a/src/openpower/decoder/power_table.py
+++ b/src/openpower/decoder/power_table.py
@@ -31,10 +31,18 @@ def do_table(insns, section):
     print ("start-end", start, end)
     bitlen = end-start+1
     half = bitlen // 2
-    xomask = ((1<<bitlen)-1) << start
+    xomask = ((1<<bitlen)-1) << (31-start)
     lowermask = (1<<half)-1
     uppermask = (1<<(bitlen-half))-1
     table_entries = {}
+    # debug-print all opcodes first
+    for insn in insns:
+        opcode = insn.opcode
+        if not isinstance(opcode, list):
+            opcode = [opcode]
+        for op in opcode:
+            print ("op", insn.name, opcode)
+
     for i in range(1<<bitlen):
         # calculate row, column
         lower = i & lowermask
@@ -44,7 +52,7 @@ def do_table(insns, section):
             table_entries[lower] = {}
         table_entries[lower][upper] = i
         # create an XO
-        key = i << start
+        key = i << (31-start)
         print ("search", i, hex(key))
         # start hunting
         for insn in insns:
-- 
2.30.2