Data processor having a data table for performing a dual functio

Details Data processor having a data table for performing a dual functio Data processor having a data table for performing a dual functio

1995-10-20

1996-08-13

Malzahn, David H.

Boots, shoes, and leggings

380 4, 395186, G06F 1214, H04L 900

Patent

active

055463339

ABSTRACT:
A data processor and method are used to find log.sub.p (x) wherein p is a numerical base and x is a floating point value. The method begins by deriving a number y from the quantity x wherein the number y has a predetermined sign portion, a predetermined exponent portion, and the fraction portion f, the predetermined fraction portion f being a truncated portion of x. A logarithm to the predetermined base p of the number y is found by calculating:

REFERENCES:
patent: 5014234 (1991-05-01), Edwards, Jr.
patent: 5131091 (1992-07-01), Mizuta
patent: 5301138 (1994-04-01), Lindsley
patent: 5327563 (1994-07-01), Singh
patent: 5481672 (1996-01-01), Okuno et al.
patent: 5483658 (1996-01-01), Grube et al.
patent: 5490216 (1996-02-01), Richardson, III
"An Accurate Elementary Mathematical Library for the IEEE Floating Point Standard," Gal et al; ACM Transactions on Mathematical Software, vol. 17, No. 1, Mar. 1991.
"Table-Driven Implementation of the Logarithm Function in IEEE Floating-Point Arithmetic," Tang; ACM Transactions on Mathematical Software, vol. 16, No. 4, Dec. 1990.

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