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:
Jan. 16, 1990
Filed:
Jul. 31, 1987
Brian K Langendorf, Worcester, MA (US);
Prime Computer, Inc., Natick, MA (US);
Abstract
A look ahead fetch system for a pipelined digital computer is provided for predicting in advance of decoding the outcome of a branch instruction. The system includes a branch cache having a plurality of associative sets for storing branch target addresses indexed by the lowest significant bits of the corresponding branch instruction's address. A memory for storing a coupling bit vector indicative for each branch cache set of whether the set contains a corresponding branch target address. The coupling bit vector is used to guide prediction logic to the correct branch cache sets for qualifying the entry there contained having an index corresponding to a fetched instruction's address for formulating a prediction of the next instruction to be processed.