Operation unit for floating point data with variable exponent-pa

Details Operation unit for floating point data with variable exponent-pa Operation unit for floating point data with variable exponent-pa

1985-12-13

1988-07-26

Harkcom, Gary V.

Boots, shoes, and leggings

235310, G06F 748, G06F 500

Patent

active

047605510

ABSTRACT:
An operation unit has a significant digit number judging circuit in which to detect as to whether or not a significant digit number of exponent part variable length data obtained as an arithmetic result becomes smaller than a specified minimum significant digit number, this operation unit manipulating data characterized in that exponent and mantissa parts thereof vary in length according to data values and its data length is fixed. In a first embodiment, there is a circuit for detecting the significant digit number of the resultant data with a variable length exponent part, the data being gained by a step wherein exponent and mantissa data are combined by using the exponent data of the resultant fixed length exponent and mantissa data. A second embodiment involves utilization of a circuit in which to detect as to whether or not the significant digit number is lower than a predetermined significant digit number by directly employing the resultant data with the variable length exponent part which data are procured after completion of the combination.

REFERENCES:
patent: 4603323 (1986-07-01), Hassitt et al.
patent: 4617641 (1986-10-01), Hamada
patent: 4675809 (1987-06-01), Omoda et al.

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