From 9f5cd2e425fdb8e89531a5a89ade539b7d79a517 Mon Sep 17 00:00:00 2001
From: Mike Naberezny <mike@naberezny.com>
Date: Sun, 14 Dec 2014 15:56:15 -0800
Subject: [PATCH] Speed up run() by caching in local variables

---
 py65/monitor.py | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/py65/monitor.py b/py65/monitor.py
index 98ad997..99a7d68 100644
--- a/py65/monitor.py
+++ b/py65/monitor.py
@@ -439,17 +439,19 @@ class Monitor(cmd.Cmd):
     def _run(self, stopcodes):
         stopcodes = set(stopcodes)
         breakpoints = set(self._breakpoints)
+        mpu = self._mpu
+        mem = self._mpu.memory
 
-        if not breakpoints: # optimization
+        if not breakpoints:
             while True:
-                self._mpu.step()
-                if self._mpu.memory[self._mpu.pc] in stopcodes:
+                mpu.step()
+                if mem[mpu.pc] in stopcodes:
                     break
         else:
             while True:
-                self._mpu.step()
-                pc = self._mpu.pc
-                if self._mpu.memory[pc] in stopcodes:
+                mpu.step()
+                pc = mpu.pc
+                if mem[pc] in stopcodes:
                     break
                 if pc in breakpoints:
                     msg = "Breakpoint %d reached."