On the attributes of the SCISM organization

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Abstract
In this paper, we describe some of the attributes of the SCISM organization, a multiple instruction-issuing machine, the outcome of five years of research at the IBM Glendale Laboratory, in Endicott, New York. The proposed organization embodies a number of mechanisms, including the analysis of instruction sequences and deciding which instructions will execute in parallel prior to instruction fetch and issue, the incorporation of permanent preprocessing of instructions to be executed in parallel, the categorization of instructions for parallel execution on the basis of hardware utilization rather than opcode description, the avoidance of memory interlocks through the preprocessing mechanism, and the elimination of execution interlocks with specialized hardware. It is shown that by incorporating these mechanisms, a SCISM capable of issuing and executing two instructions per cycle can achieve more than 90% of the theoretical maximum performance of an idealized, dual instruction issue superscalar machine.

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