From a714a9d71a6a472908df8eb6f0434f53b378195a Mon Sep 17 00:00:00 2001
From: Loic Nageleisen <loic.nageleisen@gmail.com>
Date: Sat, 14 Apr 2012 15:41:20 +0200
Subject: [PATCH] guard against SET PC, [SP++], and SET PC, [--SP]

---
 dcpu_16.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dcpu_16.py b/dcpu_16.py
index 131d6f3..b0e60c1 100644
--- a/dcpu_16.py
+++ b/dcpu_16.py
@@ -415,8 +415,10 @@ class CPU(object):
     def run(c):
         """step until PC is constant"""
         last_pc = 0xFFFF
-        while c.pc != last_pc:
+        last_sp = 0xFFFF
+        while c.pc != last_pc or c.sp != last_sp:
             last_pc = c.pc
+            last_sp = c.sp
             c.step()
         log("Infinite loop")