Apparatus for computing transcendental functions quickly

Details Apparatus for computing transcendental functions quickly Apparatus for computing transcendental functions quickly

1996-12-17

1999-10-05

Grant, William

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36471801, 36473601, 36473602, 36474801, 36476002, 36478603, 36478701, G06F 738, G06F 750, G06F 752

Patent

active

059634600

ABSTRACT:
The invention provides a method and system for computing transcendental functions quickly: (1) the multiply ALU is enhanced to add a term to the product, (2) rounding operations for intermediate multiplies are skipped, and (3) the Taylor series is separated into two partial series which are performed in parallel. Transcendental functions with ten terms (e.g., SIN or COS), are thus performed in about ten clock times.

REFERENCES:
patent: 3813529 (1974-05-01), Bartlett
patent: 4075704 (1978-02-01), O'Leary
patent: 4589067 (1986-05-01), Porter et al.
patent: 4620292 (1986-10-01), Hagiwara et al.
patent: 4969118 (1990-11-01), Montoye et al.
patent: 5497343 (1996-03-01), Rarick
Montoye et al; Microprocessors: An 18ns 56-Bit Multiply-Add Circuit; Feb. 14, 1990; pp. 46-47, and 262.

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