Method and apparatus for generating an initial estimate for a fl

Details Method and apparatus for generating an initial estimate for a fl Method and apparatus for generating an initial estimate for a fl

1996-10-21

1999-07-13

Ngo, Chuong D.

Boots, shoes, and leggings

G06F 738

Patent

active

059235772

ABSTRACT:
An initial estimate of a reciprocal of a floating point number is generated in one addition having correct sign, exponent and up to five or more bits of precision in the fraction by subtracting the input floating point number from a constant. The constant is determined such that subtracting the floating point number from the constant results in bit complementing the most significant m bits (f.sub.0 . . . f.sub.m), 1.ltoreq.m.ltoreq.n, of the fractional part of the floating point number to provide 1.f.sub.0 . . . f.sub.m , negating the exponent E and subtracting 1, to provide an initial estimate of the exponent=-E-1, and including in the constant a correction factor to further improve the initial estimate.

REFERENCES:
patent: 3648038 (1972-03-01), Sierra
patent: 3777132 (1973-12-01), Bennett, Jr.
patent: 5065352 (1991-11-01), Nakano
patent: 5153851 (1992-10-01), Kanazawa et al.

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