From 7ea3dfac296a44612a6784223319ae7f7ee6e904 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sun, 3 Dec 2023 11:32:28 +0000
Subject: [PATCH] bug 1231: all dc* instructions to be treated as nop

https://bugs.libre-soc.org/show_bug.cgi?id=1231#c1
---
 src/openpower/decoder/isa/caller.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/openpower/decoder/isa/caller.py b/src/openpower/decoder/isa/caller.py
index c8dc488c..69adf9fb 100644
--- a/src/openpower/decoder/isa/caller.py
+++ b/src/openpower/decoder/isa/caller.py
@@ -2108,6 +2108,11 @@ class ISACaller(ISACallerHelper, ISAFPHelpers, StepLoop):
             illegal = False
             ins_name = dotstrp
 
+        # match against instructions treated as nop, see nop below
+        if asmop.startswith("dc"):
+            illegal = False
+            ins_name = "nop"
+
         # branch-conditional redirects to sv.bc
         if asmop.startswith('bc') and self.is_svp64_mode:
             ins_name = 'sv.%s' % ins_name
-- 
2.30.2