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. 28, 1995
Filed:
Mar. 01, 1994
Robert P Colwell, Portland, OR (US);
Andrew F Glew, Hillsboro, OR (US);
David B Papworth, Beaverton, OR (US);
Glenn J Hinton, Portland, OR (US);
David W Clift, Hillsboro, OR (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
A register alias table unit (RAT) with an idiom recognition mechanism for overriding partial width conditions stalls is described. A partial width stall condition occurs during the RAT renaming process when a logical source register being renamed is larger than the corresponding physical source register pointed to by a renaming table. An idiom recognizer detects uops that zero their logical destination register and sets and clears zero bits in an iRAT array accordingly. The zero bits indicate which portions of an entry's physical source register are known to be zeros. A partial width stall override mechanism overrides a partial width stall condition when the zero bits for the physical source register causing the partial width stall indicate that the 'missing' portion of the physical source register contains zeros. The performance of a microprocessor implementing such a RAT renaming mechanism with an idiom recognizer is improved because common partial width stalls are avoided.