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The implementation of a superscalar, speculative execution SPARC-V9 microprocessor incorporating Restricted Data Flow principles required many design trade-offs. Consideration was given to both performance and cost. Performance is largely a function of cycle time and instructions executed per cycle while cost is primarily a function of die area. Here we describe our Restricted Data Flow implementation and the means with which we arrived at its configuration. Future semiconductor technology advances will allow these trade-offs to be relaxed and higher performance Restricted Data Flow machines to be built.
Simone et al. (Sun,) studied this question.