\section{Acknowledgments}

We would like to thank R.S. Nikhil and Greg Papadopoulos for
permitting us to use diagrams and codes from their papers in this
document.  We would also like to thank Jamey Hicks, R.S. Nikhil, Shail
Aditya, R. Paul Johnson, and Yuli Zhou, for reading various drafts of
this paper and offering helpful comments.

The discussion on {\archname} has involved many people, both within
our group and at Motorola.  We have had very extensive discussions
with Mike Beckerle, Bob Greiner and Jamey Hicks at Motorola and with
Greg Papadopoulos, James Hoe, Chris Joerg, and Andy Boughton at MIT.

This paper describes research done at the Laboratory for Computer
Science of the Massachusetts Institute of Technology. Funding for the
Laboratory is provided in part by the Advanced Research Projects
Agency of the Department of Defense under the Office of Naval Research
contract N00014-92-J-1310.

