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:
Sep. 23, 2003
Filed:
Oct. 01, 1999
Marc Tremblay, Menlo Park, CA (US);
Chandramouli Banerjee, Fremont, CA (US);
Sun Microsystems, Inc., Santa Clara, CA (US);
Abstract
The present invention provides an efficient implementation of multiprecision arithmetic, such as for a microprocessor. In one embodiment, a method includes executing a generate carry instruction on a microprocessor, the generate carry instruction determining the carry bit of the addition of a first operand and a second operand. The generate carry instruction can be executed in parallel on the microprocessor with an add (without carry) instruction of the first operand and the second operand. In one embodiment, a generate borrow instruction is similarly provided for an efficient implementation of multiprecision subtraction operations executed on the microprocessor. Accordingly, multiprecision arithmetic can be provided on a microprocessor without the use of a dedicated condition code register for the carry bit or borrow bit of multiprecision arithmetic operations.