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:
Mar. 30, 2010
Filed:
Jul. 18, 2007
Sampan Arora, Bangalore, IN;
Divya S. Anvekar, Bangalore, IN;
Manoj Dusanapudi, Bangalore, IN;
Sunil Suresh Hatti, Gokul, IN;
Shakti Kapoor, Austin, TX (US);
Bhavani Shringari Nanjundiah, Bangalore, IN;
Sampan Arora, Bangalore, IN;
Divya S. Anvekar, Bangalore, IN;
Manoj Dusanapudi, Bangalore, IN;
Sunil Suresh Hatti, Gokul, IN;
Shakti Kapoor, Austin, TX (US);
Bhavani Shringari Nanjundiah, Bangalore, IN;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system and method for predicting lwarx (Load Word And Reserve Index form) and stwcx (Store Word Conditional) instruction outcome is presented. A lwarx instruction establishes a reservation on an address/granule, and a stwcx instruction targeted to the same address/granule 'succeeds' only if the reservation for the granule still exists (conditional store). Since the reservation may be lost due to situations such as, for example, a processor (or another processor) executing a different lwarx or ldarx instruction (or other mechanism), which clears the first reservation and establishes a new reservation, the invention described herein builds test patterns in a manner that ensures, stwcx success and failure predictability. As a result, stwcx instructions are testable during test pattern execution.