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+#! /usr/bin/env perl
+# Copyright (c) 2003 The Regents of The University of Michigan
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Authors: Steve Reinhardt
+
+# Script to simplify using rundiff on trace outputs from two invocations of m5.
+
+if (@ARGV < 2) {
+    die "Usage: tracediff sim1 sim2 [args...]\n";
+}
+
+# First two args are the two simulator binaries to compare
+$sim1 = shift;
+$sim2 = shift;
+
+# Everything else on the command line is taken to be an m5 argument to
+# be given to both invocations
+$simargs = join(' ', @ARGV);
+
+$cmd1 = "$sim1 $simargs --stats:file=tracediff-$$-1.stats 2>&1 |";
+$cmd2 = "$sim2 $simargs --stats:file=tracediff-$$-2.stats 2>&1 |";
+
+# This only works if you have rundiff in your path.  I just edit it
+# with an explicit path if necessary.
+$fullcmd = "rundiff '$cmd1' '$cmd2' 2>&1 > tracediff-$$.out";
+
+print "Executing $fullcmd\n";
+system($fullcmd);
+
+
+