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:
Jun. 21, 2005
Filed:
Jul. 31, 2002
Hung Qui Le, Austin, TX (US);
Alexander Erik Mericas, Austin, TX (US);
Robert Dominick Mirabella, Round Rock, TX (US);
Toshihiko Kurihara, Kanagawa-ken, JP;
Michitaka Okuno, Nagano, JP;
Masahiro Tokoro, Kanagawa, JP;
Hung Qui Le, Austin, TX (US);
Alexander Erik Mericas, Austin, TX (US);
Robert Dominick Mirabella, Round Rock, TX (US);
Toshihiko Kurihara, Kanagawa-ken, JP;
Michitaka Okuno, Nagano, JP;
Masahiro Tokoro, Kanagawa, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A circuit and method for maintaining a correct value in performance monitor counter within a speculative computer microprocessor is disclosed. In response to determining the begin of speculative execution within the microprocessor, the value of the performance monitor counter is stored in a rewind register. The performance monitor counter is incremented in response to predetermined events. If the microprocessor determines the speculative execution was incorrect, the value of the rewind register is loaded into the counter, restoring correct value for the counter.