Multiplying unit in a computer system, capable of population cou

Details Multiplying unit in a computer system, capable of population cou Multiplying unit in a computer system, capable of population cou

1988-11-21

1991-01-29

Harkcom, Gary V.

Boots, shoes, and leggings

364754, G06F 700, G06F 752

Patent

active

049891685

ABSTRACT:
Population counting is performed by using a multiplying unit, in the computer system, including a plurality of multiplying sub-units for simultaneously executing partial multiplication among elements obtained by dividing a multiplicand data and a multiplier data in a regular multiplication mode. In a population counting mode, an input data for the population counting is divided into population counting elements instead of the multiplier data and population counting on the population counting elements are performed simultaneously using the multiplying sub-units which produce partial counted data of the population counting elements, and the partial counted data is sent to a carry save adder and a carry propagate adder by which a population counting result for the input data is obtained and output.

REFERENCES:
patent: 3814924 (1974-06-01), Tate
patent: 4189716 (1980-02-01), Krambeck
patent: 4594680 (1986-06-01), Schomburg et al.
patent: 4630192 (1986-12-01), Wassal et al.
patent: 4679164 (1987-07-01), Rearick
patent: 4825401 (1989-04-01), Ikumi

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