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. 13, 2004
Filed:
Jan. 18, 2002
Akihiro Takamura, Koganei, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A processor having an execution result prediction function for an instruction that performs a branch/value prediction by which a high percentage of correct predictions can be realized ought to be provided. Accordingly, in a branch/value prediction circuit having a set associative, a priority of an entry used for a prediction is increased only when an execution result is referred to for the prediction and the prediction is correct, and the execution result is registered in the entry of the lowest priority when the execution result for the instruction is newly registered in a history table. Thus, the entry of a low percentage of correct predictions becomes easy to erase and prediction accuracy can be increased by updating the priority only when the prediction is correct.