Data processing system for determining min/max in a single opera

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36471506, G06F 900

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active

047746882

ABSTRACT:
A data processing system is provided which includes ALU data busses, temporary operand storage registers, an accumulator, and a set of latches for temporarily storing data to be supplied to the input of the ALU. Output multiplexer is provided which can select the output of one of the latches or that of the ALU which is sent to the accumulator. A detector is also provided for determining whether the smaller or larger one of two data elements is stored in said latches according to the status of the ALU and a new MIN/MAX instruction and the selected data element is returned to a predetermined temporary storage register via the output multiplexer. A controller operates in cooperation with the system instruction decoder to effect this operation with a single machine instruction. In determining the minimum or maximum of N data elements, it is only necessary to execute the MIN or MAX operations N-1 times, whereby the maximum or the minimum can be easily determined, the length of the program shortened, and the execution time reduced.

REFERENCES:
patent: 4183087 (1980-01-01), Huelsman
patent: 4308589 (1981-12-01), Joyce et al.
patent: 4467444 (1984-08-01), Harmon et al.
patent: 4539549 (1985-09-01), Hong
patent: 4597053 (1986-06-01), Chamberlin
"ALU Implements Native Minimum/Maximum Function for Signal Processing Applications", IBM Tech. Disclosure Bulletin, vol. 29, No. 5, 10/86, pp. 1975-1978.
IBM Technical Disclosure Bulletin, vol. 22, No. 7, Dec. 1979, pp. 2671-2672, Parallel-Search Max/Min Word Algorithm.

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