Multiplying unit in a computer system, capable of population counting
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United States of America Patent
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-
Jan 29, 1991
Grant Date -
N/A
app pub date -
Nov 21, 1988
filing date -
Nov 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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