Fast multiply-add instruction sequence in a pipeline floating-po

Details Fast multiply-add instruction sequence in a pipeline floating-po Fast multiply-add instruction sequence in a pipeline floating-po

1994-07-20

1996-05-14

Malzahn, David H.

Boots, shoes, and leggings

364736, G06F 738

Patent

active

055174388

ABSTRACT:
A pipeline floating point processor in which the addition pipelining is reorganized so that no wait cycle is needed when the addition uses the result of an immediately foregoing multiplication (fast multiply-add instruction). The reorganization implies the following changes of an existing data flow of the pipeline floating processor: data feed-back via path ND of normalized data from the multiplier M into the aligners AL1 and AL2; shift left one digit feature on both sides of the data path for taking account of a possible leading zero digit of the product, and special zeroing of potential guard digits by Z1 and Z2; exponent build by 9 bits for overflow and underflow recognition, and due to an underflow the exponent result, is reset to zero on the fly by a true zero unit (T/C).

REFERENCES:
patent: 4916651 (1990-04-01), Gill et al.
patent: 4969118 (1990-11-01), Montoye
patent: 5204828 (1993-04-01), Kohn
patent: 5212662 (1993-05-01), Cocanougher et al.
patent: 5241493 (1993-08-01), Chu et al.
patent: 5375078 (1994-12-01), Hrvsecky et al.
Patent Abstracts of Japan, vol. 013, No. 444 (E-828), 5 Oct. 1989, & JP-A-01 170 111 (Hitachi Ltd.) 5 Jul. 1989 (abstract).
IBM J. Res. Dev. (USA), IBM Journal of Research and Development, Jul. 1992, USA, 36, 4, 733-749 ISSN 0018-8646 Dao-Trong.
S et al. "A Single-Chip IBM System/390 Floating-Point Processor In CMOS", p. 734, column 1, line 21-line 43; FIG. 1.

Affiliated with

Also associated with

Rating

Fast multiply-add instruction sequence in a pipeline floating-po does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fast multiply-add instruction sequence in a pipeline floating-po, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast multiply-add instruction sequence in a pipeline floating-po will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1901650