Floating point unit for detecting and representing inexact...

Details Floating point unit for detecting and representing inexact... Floating point unit for detecting and representing inexact...

2006-06-27

2006-06-27

Ngo, Chuong Dinh (Department: 2124)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S525000, C708S497000

Reexamination Certificate

active

07069289

ABSTRACT:
A method and system perform a rounding step of a floating point computation on at least one floating point operand to preserve an inexact status. Inexact status information generated from the rounding step may be encoded within the result, instead of requiring a separate floating point status register for the inexact status information. In one embodiment, inexact status information is preserved by determining whether the at least one operand is inexact. Further, an intermediate result of the floating point computation is analyzed to determine whether it is inexact. Finally, the intermediate result is rounded based on whether the at least one operand is inexact and whether the intermediate result is inexact to preserve an inexact status of the at least one operand and the intermediate result.

REFERENCES:
patent: 3725649 (1973-04-01), Deerfield
patent: 4777613 (1988-10-01), Shahan et al.
patent: 4788655 (1988-11-01), Nakayama et al.
patent: 4991131 (1991-02-01), Yeh et al.
patent: 5065352 (1991-11-01), Nakano
patent: 5126963 (1992-06-01), Fukasawa
patent: 5161117 (1992-11-01), Waggener, Jr.
patent: 5249149 (1993-09-01), Cocanougher et al.
patent: 5307303 (1994-04-01), Briggs et al.
patent: 5347481 (1994-09-01), Williams
patent: 5347482 (1994-09-01), Williams
patent: 5357237 (1994-10-01), Bearden et al.
patent: 5363321 (1994-11-01), Dao Trong et al.
patent: 5365465 (1994-11-01), Larson
patent: 5481489 (1996-01-01), Yanagida et al.
patent: 5570310 (1996-10-01), Smith
patent: 5666301 (1997-09-01), Makino
patent: 5748516 (1998-05-01), Goddard et al.
patent: 5812439 (1998-09-01), Hansen
patent: 5862066 (1999-01-01), Rossin et al.
patent: 5892697 (1999-04-01), Brakefield
patent: 5931943 (1999-08-01), Orup
patent: 5953241 (1999-09-01), Hansen et al.
patent: 5963461 (1999-10-01), Gorshtein et al.
patent: 5978901 (1999-11-01), Luedtke et al.
patent: 5995991 (1999-11-01), Huang et al.
patent: 6009511 (1999-12-01), Lynch et al.
patent: 6049865 (2000-04-01), Smith
patent: 6081823 (2000-06-01), Purcell et al.
patent: 6105047 (2000-08-01), Sharangpani et al.
patent: 6108772 (2000-08-01), Sharangpani
patent: 6131106 (2000-10-01), Steele, Jr.
patent: 6138135 (2000-10-01), Karp
patent: 6151669 (2000-11-01), Huck et al.
patent: 6189094 (2001-02-01), Hinds et al.
patent: 6205460 (2001-03-01), Steele, Jr.
patent: 6219685 (2001-04-01), Story
patent: 6256655 (2001-07-01), Ezer et al.
patent: 6286023 (2001-09-01), Purcell et al.
patent: 6286024 (2001-09-01), Yano et al.
patent: 6360189 (2002-03-01), Hinds et al.
patent: 6393555 (2002-05-01), Meier et al.
patent: 6490607 (2002-12-01), Oberman
patent: 6571265 (2003-05-01), Story
patent: 6594681 (2003-07-01), Prabhu
patent: 6629120 (2003-09-01), Walster et al.
patent: 6658443 (2003-12-01), Walster
patent: 6658444 (2003-12-01), Walster et al.
patent: 6697832 (2004-02-01), Kelley et al.
patent: 6732134 (2004-05-01), Rosenberg et al.
patent: 6789098 (2004-09-01), Dijkstra
patent: 2002/0194232 (2002-12-01), Walster
patent: 2003/0033335 (2003-02-01), Walster
U.S. Appl. No. 10/320,547, filed Dec. 17, 2002, Steele, Jr.
U.S. Appl. No. 10/320,450, filed Dec. 17, 2002, Steele, Jr.
U.S. Appl. No. 10/035,581, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/028,375, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,579, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,580, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,582, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,583, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,584, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,585, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,586, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,587, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,595, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,647, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,674, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,741, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,746, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/035,747, filed Dec. 28, 2001, Steele, Jr.
U.S. Appl. No. 10/036,133, filed Dec. 28, 2001, Steele, Jr.
Title: Lecture Notes on the Status of “IEEE Standard 754 for Binary Floating-Point Arithmetic”, by Prof. W. Kahan, May 31, 1996, pp. 1-30.
Title: “Interval Arithmetic Specification” by Dmitri Chiriaev & G. William Walster, Draft revised May 4, 1998, pp. 1-78.
Title: “IEEE Standard for Binary Floating-Point Arithmetic IEEE Standard 754-1985,” by Standards Committee of the IEEE Computer Society, The Institute of Electrical and Electronics Engineers, Inc., copyright 1985, pp. 1-14.
Office Action mailed May 5, 2005 in U.S. Application No. 10/035,589.

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