Bull Hn Information Systems, Inc.

William E Woods, Deceased

Richard A Lemay

Edward Kumiega

An application such as an interpretative emulator executes a wide range of different classes of emulated program instructions developed for the processor architecture being emulated on a host system which includes an dual integer pipelined execution unit. The sets of RISC instructions which execute emulated program instructions are organized within the emulator so as to be processed as two distinct instruction streams by the dual integer pipelined execution units wherein one of the pipelined unit performs the steps necessary to completing a current or foreground like operation on each emulated program instruction while the other pipelined unit performs the steps of an anticipated lookahead or background like operation on the next emulated program instruction. By having one unit execute operations such as interpreting each program instruction within an established foreground instruction stream and the other unit execute operations such as prefetching each next program instruction within an established background instruction stream, the speed of emulated program execution is optimized.

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Natick, MA, United States of America

William E Woods, Deceased