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:
Feb. 12, 2002
Filed:
Sep. 24, 1998
David B. Witt, Austin, TX (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
Disclosed is a circuit and method for multiple access of a branch history table during a single clock cycle. In accordance thereto, a first branch history table index is generated which is used for accessing the branch history table. A first counter value is read from the branch history table in response to accessing the branch history table using the first branch history table index. A second branch history table index is also generated for accessing the branch history table. A pair of counter values are read from the branch history table in response to accessing the branch history table using the second branch history table index. One of the pair of counter values is selected based upon the value of the first counter value read from the branch history table. The first and second counter values in turn are used for predicting corresponding first and second branch instructions. The first and second branch history table indexes are generated in the same cycle. Likewise, the first counter value and the pair of counter values are read from the branch history table in the same clock cycle. Lastly, the second counter value is selected from the pair of counter values in the same cycle.