Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2005-09-06
2005-09-06
Mai, Tan V. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
C708S497000
Reexamination Certificate
active
06941335
ABSTRACT:
A method and apparatus for adding and multiplying floating-point operands such that a fixed-size mantissa result is produced. In accordance with the present addition method, the mantissa of a first floating-point operand is shifted in accordance with relative operand exponent information. Next, the first operand mantissa is added to the second operand mantissa. The addition step includes replacing a least significant non-overlapped portion of the first operand mantissa with a randomly-generated carry-in bit. In accordance with the multiplication method, a partial product array is generated from a pair of floating-point operand mantissas. Next, prior to compressing the partial product array into a compressed mantissa result, a lower-order bit portion of the partial product array is replaced with a randomly generated carry-in value.
REFERENCES:
patent: 4562553 (1985-12-01), Mattedi et al.
patent: 4644490 (1987-02-01), Kobayashi et al.
patent: 4758972 (1988-07-01), Frazier
patent: 4839846 (1989-06-01), Hirose et al.
patent: 4922446 (1990-05-01), Zurawski et al.
patent: 5128889 (1992-07-01), Nakano
patent: 5337265 (1994-08-01), Desrosiers et al.
patent: 6199089 (2001-03-01), Mansingh
patent: 6205461 (2001-03-01), Mansingh
patent: 2003/0115236 (2003-06-01), Naini et al.
Dhong Sang Hoo
Hofstee Harm Peter
Nowka Kevin
Posluszny Steven Douglas
Silberman Joel Abraham
Dillon & Yudell LLP
International Business Machines - Corporation
Mai Tan V.
Salys Casimer K.
LandOfFree
Random carry-in for floating-point operations does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Random carry-in for floating-point operations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Random carry-in for floating-point operations will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3410084