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:
Jun. 09, 1998
Filed:
Oct. 06, 1995
Robert L Caulk, Jr, Livermore, CA (US);
LSI Logic Corporation, Milpitas, CA (US);
Abstract
An add with circular mask operation is executed in a RISC processor which includes a coprocessor having a register for storing a circular mask value. A circular mask instruction to the coprocessor includes a value in an immediate field and identifies a general register (RS), and a destination register (RT). The coprocessor operates on the value stored in the general register with the value in the immediate field and then masks the results using the circular mask value. The results are then stored in the destination register. The operation includes sign-extending the immediate field before adding to the contents of the general register to provide a sum, and the sum is then masked with the circular mask value.