Methods and apparatus for determining a floating-point...

Details Methods and apparatus for determining a floating-point... Methods and apparatus for determining a floating-point...

2007-09-18

2007-09-18

Ngo, Chuong D. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

10118349

ABSTRACT:
Methods and apparatus are disclosed for determining a floating-point exponent associated with an underflow condition or an overflow condition. The methods and apparatus determine the ‘true’ value of a floating-point exponent based on a truncated value of the floating-point exponent passed from a floating-point hardware unit to an exponent determination module when the floating-point hardware unit encounters an underflow condition or an overflow condition. The determined value of the floating-point exponent may then be passed to a floating-point software unit for additional floating-point calculations, if necessary. If the floating-point hardware unit does not encounter an underflow condition or an overflow condition, the floating-point hardware unit and/or the floating-point software unit preferably perform the floating-point operation without the assistance of the exponent determination module.

REFERENCES:
patent: 4647401 (1987-03-01), Gradeff et al.
patent: 5892697 (1999-04-01), Brakefield
patent: 6571265 (2003-05-01), Story
patent: 2003/0041081 (2003-02-01), Steele
Steve Hollasch, “IEEE Standard 754 Floating Point Numbers”, Dec. 4, 2001, http://research.microsoft.com/˜hollasch/cgindex/coding/ieeefloat.html.

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