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:
Oct. 29, 2002
Filed:
Sep. 02, 1999
Hoichi Cheong, Austin, TX (US);
R. William Hay, Austin, TX (US);
James Allan Kahle, Austin, TX (US);
Hung Qui Le, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An ISYNC instruction does not cause a flush of speculatively dispatched or fetched instructions (instructions that are dispatched or fetched after the ISYNC instruction) unconditionally. The present invention detects the occurrence of any instruction that changes the state of the machine and requires a context synchronizing complete; these instructions are called context-synchronizing-required instructions. When a context-synchronizing-required instruction completes, the present invention sets a flag to note the occurrence of that condition. When an ISYNC instruction completes, the present invention causes a flush and refetches the instruction after the ISYNC if the context-synchronizing-required flag is active. The present invention then resets the context-synchronizing-required flag. If the context-synchronizing-required flag is not active, then the present invention does not generate a flush operation.