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:
Apr. 21, 2020
Filed:
Jul. 30, 2018
Apple Inc., Cupertino, CA (US);
Kulin N. Kothari, Cupertino, CA (US);
Mridul Agarwal, Sunnyvale, CA (US);
Aditya Kesiraju, San Jose, CA (US);
Deepankar Duggal, Sunnyvale, CA (US);
Sean M. Reynolds, Cupertino, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A system and method for efficiently handling speculative execution. A load store unit (LSU) of a processor stores a commit candidate pointer, which points to a given store instruction buffered in the store queue. The given store instruction is an oldest store instruction not currently permitted to commit to the data cache. The LSU receives a first pointer from the mapping unit, which points to an oldest instruction of non-dispatched branches and unresolved system instructions. The LSU receives a second pointer from the execution unit, which points to an oldest unresolved, issued branch instruction. When the LSU determines the commit candidate pointer is older than each of the first pointer and the second pointer, the commit candidate pointer is updated to point to an oldest store instruction younger than the given store instruction stored in the store queue. The given store instruction is permitted to commit to the data cache.