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:
May. 27, 2003
Filed:
Feb. 21, 2000
Stephen L Bass, Ft Collins, CO (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A floating-point multiply accumulate method acquiring a final mantissa result comprises comparing exponents of (A*B) and C. Transferring part of the C mantissa to a CHI register. Shifting any part of the C mantissa which overlaps the range of the (A*B) mantissa to align the bits of the (A*B) and C mantissas. Adding the shifted part of the C mantissa to the (A*B) mantissa. Shifting least significant bits corresponding to a number of bits transferred to the CHI register out of the Temp. Result. Mask merging bits of the C mantissa which were transferred to the CHI register with most significant bit positions of the shifted Temp. Result. Rounding this mantissa result to the first precision and acquiring L from an Lbit value of the CHI register or an Lbit value of the Temp. Result based on the bit value of the merge mask corresponding to the Lbit position.