Unisys Corporation

Scott D Koenigsman

Gregory F Hammitt

A program history (P-history) listing of branch-type instruction addresses for pipelined data processing system that employs one or more pipelined processors is stored in a random access memory (RAM) which is also used to store other executive or task information. A set of three queue registers is used to respectively store, 1) the absolute 'to' address to which a branch instruction will jump, 2) the relative 'to' address, to which the branch instruction will jump, and 3) the relative 'from' address, from which the branch instruction will jump. The queues allow the storage of the P-history in the RAM without interference with the use of the RAM by the other functions that access it and without interruption of the pipelined processor.

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St. Joseph, MI, United States of America

Scott D Koenigsman