Reduction of add-pipe logic by operand offset shift

Details Reduction of add-pipe logic by operand offset shift Reduction of add-pipe logic by operand offset shift

2006-05-09

2006-05-09

Backer, Firmin (Department: 3621)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S508000, C340S146200, C712S222000

Reexamination Certificate

active

07043516

ABSTRACT:
The shifters (30, 32) that a floating-point processor (10)'s addition pipeline (14) uses to align or normalize floating-point operands' mantissas before addition or subtraction shift a given mantissa pair one more bit to the left for subtraction than for addition. As a result, the addition pipeline's rounding circuitry (160, 166) does not need to be capable of adding round bits in as many positions as it would without the shift difference, so it can be simpler and faster. Similarly, circuitry (164a–gand188) employed for normalization after addition and subtraction can be simpler because it does not have to implement as shift options.

REFERENCES:
patent: 4660143 (1987-04-01), King et al.
patent: 4922446 (1990-05-01), Zurawski et al.
patent: 5027308 (1991-06-01), Sit et al.
patent: 5128889 (1992-07-01), Nakano
patent: 5276634 (1994-01-01), Suzuki et al.
patent: 5384723 (1995-01-01), Karim et al.
patent: 5452241 (1995-09-01), Desrosiers et al.
patent: 5627773 (1997-05-01), Wolrich et al.
patent: 5684729 (1997-11-01), Yamada et al.
patent: 5751621 (1998-05-01), Arakawa
patent: 5884062 (1999-03-01), Wichman et al.
patent: 5889690 (1999-03-01), Arakawa
patent: 5901076 (1999-05-01), Lynch
patent: 6018756 (2000-01-01), Wolrich et al.

Affiliated with

Also associated with

Rating

Reduction of add-pipe logic by operand offset shift does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reduction of add-pipe logic by operand offset shift, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduction of add-pipe logic by operand offset shift will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3562289