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:
Nov. 16, 2010
Filed:
Feb. 28, 2006
Shailender Chaudhry, San Francisco, CA (US);
Quinn A. Jacobson, Sunnyvale, CA (US);
Paul Caprioli, Mountain View, CA (US);
Marc Tremblay, Menlo Park, CA (US);
Shailender Chaudhry, San Francisco, CA (US);
Quinn A. Jacobson, Sunnyvale, CA (US);
Paul Caprioli, Mountain View, CA (US);
Marc Tremblay, Menlo Park, CA (US);
Oracle America, Inc., Redwood City, CA (US);
Abstract
A technique recovers return address stack (RAS) content and restores alignment of a RAS top-of-stack (TOS) pointer for occurrences of mispredictions due to speculative operation, out-of-order instruction processing, and exception handling. In at least one embodiment of the invention, an apparatus includes a speculative execution processor pipeline, a first structure for maintaining return addresses relative to instruction flow at a first stage of the pipeline, at least a second structure for maintaining return addresses relative to instruction flow at a second stage of the pipeline. The second stage of the pipeline is deeper in the pipeline than the first stage. The apparatus includes circuitry operable to reproduce at least return addresses from the second structure to the first structure.