From d188b5024f876c5a5dbb0fd31ebc7f07a67cfa25 Mon Sep 17 00:00:00 2001
From: thrust26 <tjentzsch@yahoo.de>
Date: Sat, 23 Feb 2019 19:02:25 +0100
Subject: [PATCH] one more missing optimization

---
 src/emucore/Thumbulator.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/emucore/Thumbulator.cxx b/src/emucore/Thumbulator.cxx
index da16eb22e..42593a875 100644
--- a/src/emucore/Thumbulator.cxx
+++ b/src/emucore/Thumbulator.cxx
@@ -843,10 +843,14 @@ int Thumbulator::execute()
 #endif
 
   Op decodedOp;
+#ifndef UNSAFE_OPTIMIZATIONS
   if ((instructionPtr & 0xF0000000) == 0 && instructionPtr < romSize)
-    decodedOp = decodedRom[instructionPtr / 2];
+    decodedOp = decodedRom[instructionPtr >> 1];
   else
     decodedOp = decodeInstructionWord(inst);
+#else
+  decodedOp = decodedRom[instructionPtr >> 1];
+#endif
 
   switch (decodedOp) {
     //ADC