From f8498fc42d2b690e32c4c54ba880fe08a32763a5 Mon Sep 17 00:00:00 2001
From: Dmitry Selyutin <ghostmansd@gmail.com>
Date: Thu, 1 Jun 2023 00:04:13 +0300
Subject: [PATCH] power_insn: forbid r0 for RA0 and RT0

---
 src/openpower/decoder/power_insn.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/openpower/decoder/power_insn.py b/src/openpower/decoder/power_insn.py
index f93037dd..d480a3f3 100644
--- a/src/openpower/decoder/power_insn.py
+++ b/src/openpower/decoder/power_insn.py
@@ -1264,6 +1264,8 @@ class ExtendableOperand(DynamicOperand):
                 value = value[1:]
                 vector = True
             if value.startswith(prefix):
+                if (self.extra_reg.or_zero and (value == f"{prefix}0")):
+                    raise ValueError(value)
                 value = value[len(prefix):]
             value = int(value, 0)
 
-- 
2.30.2