Method and circuit for computing reciprocals

Details Method and circuit for computing reciprocals Method and circuit for computing reciprocals

1987-10-22

1989-04-18

Harkcom, Gary V.

Boots, shoes, and leggings

364748, 364765, G06F 752

Patent

active

048233013

ABSTRACT:
A circuit produces an output binary floating point number approximating with high accuracy the inverse of an input binary floating point number D in accordance with the expression (1/D).apprxeq.[(1/A)-C]+[C-(B/A.sup.2)], where the number A is a low accuracy approximation of D, and B is substantially equal to D-A. C is a number selected for each value of A such that the exponents of quantities [(1/A)-C] and [C-(B/A.sup.2)] are equal to the exponent of the quantity 1/2A. Quantities [(1/A)-C] and [C-(B/A.sup.2)] are produced by lookup tables and summed to provide an approximation of 1/D.

REFERENCES:
patent: 3633018 (1972-01-01), Ling
patent: 3648038 (1972-03-01), Sierra
patent: 3777132 (1973-12-01), Bennett, Jr.
patent: 4718032 (1988-01-01), Irukulla et al.

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