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:
Jul. 03, 2012
Filed:
Sep. 30, 2008
Rajaraman Ramanarayanan, Hillsboro, OR (US);
Sanu K. Mathew, Hillsboro, OR (US);
Ram K. Krishnamurthy, Portland, OR (US);
Shay Gueron, Haifa, IL;
Vasantha K. Erraguntla, Bangalore, IN;
Rajaraman Ramanarayanan, Hillsboro, OR (US);
Sanu K. Mathew, Hillsboro, OR (US);
Ram K. Krishnamurthy, Portland, OR (US);
Shay Gueron, Haifa, IL;
Vasantha K. Erraguntla, Bangalore, IN;
Intel Corporation, Santa Clara, CA (US);
Abstract
A merged datapath for PopCount and BitScan is described. A hardware circuit includes a compressor tree utilized for a PopCount function, which is reused by a BitScan function (e.g., bit scan forward (BSF) or bit scan reverse (BSR)). Selector logic enables the compressor tree to operate on an input word for the PopCount or BitScan operation, based on a microprocessor instruction. The input word is encoded if a BitScan operation is selected. The compressor tree receives the input word, operates on the bits as though all bits have same level of significance (e.g., for an N-bit input word, the input word is treated as N one-bit inputs). The result of the compressor tree circuit is a binary value representing a number related to the operation performed (the number of set bits for PopCount, or the bit position of the first set bit encountered by scanning the input word).