The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 2006
Filed:
Nov. 13, 2002
James Bergheim Shearer, Ossining, NY (US);
James Bergheim Shearer, Ossining, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and apparatus allows the quick computation of an estimate of the reciprocal of a floating point number in IEEE format. A table with 2entries allows the computation of an estimate with 2×k+3 good bits. x is a floating point number in IEEE format for which a reciprocal approximation is to be computed. {circumflex over (x)} be a floating point number in IEEE format derived from x by leaving the sign bit unchanged, complementing the exponent bits, leaving the first k fraction bits unchanged, and complementing the remaining fraction bits. t is another floating point number in IEEE format found by using the first k bits of the fraction of x as an index into a table with 2entries. The product {circumflex over (x)}×t computed with IEEE floating point arithmetic is an estimate of the reciprocal of x with 2×k+3 good bits (i.e., relative error less than 2).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile