Double precision approximate quotient network

Details Double precision approximate quotient network Double precision approximate quotient network

1987-07-20

1988-11-15

Harkcom, Gary V.

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G06F 752

Patent

active

047854120

ABSTRACT:
A double precision approximate quotient network determines the quotient of a 2n bit number and an n bit number where the n bit number has a value of 2.sup.n-1 -2, 2.sup.n-1 -1, 2.sup.-1, or 2.sup.n+1. Apparatus determines the 2's complement and 2 times the 2's complement of the n most significant bits of the 2n bit number. A select circuit is responsive to the value of the n bit number to select one of (a) the 2's complement of the n most significant bits of the 2n bit number, (b) 2 times the 2's complement of the n most significant bits of the 2n bit number, (c) zero, or (d) the n most significant bits of the 2n bit number. A shift register right shifts the 2n bit number one place. An adder adds the shifted 2n bit number to the number selected by the select circuit to determine the quotient. The apparatus is particularly useful in determining a double precision approximate quotient for use in double precision floating point divide and decimal divide operations.

REFERENCES:
patent: 3777132 (1973-12-01), Bennett, Jr.
patent: 4488247 (1984-12-01), Inagami et al.

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