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:
Aug. 01, 2000
Filed:
Mar. 24, 1998
Lee Evan Eisen, Austin, TX (US);
Michael Putrino, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A mechanism structured to check for instruction collisions at the Dispatch Unit rather than the Completion Unit. In processors which issue multiple commands simultaneously, a flag bit is sent to the Completion Unit and attached to the instruction in the queue that follows the other in program order if they both have the same targeted address. When the instructions from position 1 and position 2 of the instruction queue are ready to issue, the Completion Unit checks position 2 for a flag bit. If there is a bit, then the instruction in position 1 is discarded and the instruction in position 2 is written to the target address. If there is no flag bit with the instruction in position 2, the instruction in position 1 is written to the target register. This method eliminates the need to compare all the targeted addresses that are associated with the rename registers. It requires two comparisons instead of a minimum of 15 comparisons.