Non-stalling counterflow architecture

The counterflow pipeline concept was originated by Sproull et al.(1994) to demonstrate the concept of asynchronous circuits. This architecture relies on distributed decision making and localized clocking and data movement. We have taken these ideas and reformulated them into a substantially faster more scalable architecture that has the same distributed decision making and locality for clocking and data, but adds very aggressive speculation, no stalls, and other desirable characteristics. A high level Java simulator has been built to explore the design tradeoffs and evaluate performance.