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:
Dec. 29, 2015
Filed:
Dec. 13, 2013
Oracle International Corporation, Redwood City, CA (US);
David R. Chase, Belmont, MA (US);
Nils Gura, Belmont, CA (US);
Guy L. Steele, Jr., Burlington, MA (US);
Oracle International Corporation, Redwood City, CA (US);
Abstract
A lookup circuit evaluates hash functions that map keys to addresses in lookup tables. The circuit includes multiple hash function sub-circuits, each of which applies a respective hash function to an input key, producing a hash value. Candidate pairs of hash functions to be implemented by the hash function sub-circuits (or hash function bit matrices thereof) may be generated and tested for suitability in hashing a particular collection of keys. Each hash function bit matrix may be generated according to heuristics chosen to improve the likelihood that it will be suitable for use in a pair, and may be tested against previously generated hash function bit matrices contained in one or more pools (each of which may contain matrices generated using different heuristics) to identify suitable pairs. The hash function bit matrices may be represented in the pools in a tabulated form, which may reduce the suitability testing time.