From 91ed230d8324cded1a5d82cf8f85d9d81af00956 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Mon, 31 Oct 2022 19:14:05 -0700
Subject: Only use DF for addresses generated via indirection.

---
 isa/decode.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'isa/decode.cpp')

diff --git a/isa/decode.cpp b/isa/decode.cpp
index af38c64..f183c1f 100644
--- a/isa/decode.cpp
+++ b/isa/decode.cpp
@@ -373,7 +373,7 @@ instruction_context decode(unsigned int dfifb, unsigned int pc, unsigned int bit
 
     // Instructions with memory operands may be direct or indirect
     if (inst.need_exec_load || inst.need_exec_store || inst.possibly_redirects) {
-        auto addr = (df << 12) | ((bits & 00200) ? (pc & 07600) : 0) | (bits & 00177);
+        auto addr = (pc & 070000) | ((bits & 00200) ? (pc & 07600) : 0) | (bits & 00177);
         if (bits & 00400) {
             inst.need_indirect_load = true;
             inst.init_address = addr;
-- 
cgit v1.2.3