Floating point number storage method and floating point...

Details Floating point number storage method and floating point... Floating point number storage method and floating point...

2007-03-06

2007-03-06

Malzahn, D. H. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

10405242

ABSTRACT:
In order to provide a method or the like for storing floating point numbers to make it easier to manage the floating point numbers using a fixed point processor, when a real number x is represented by a*(2^n) where a mantissa is a and an exponent is n, the mantissa is stored as a fixed point number in the upper U bits of N-bit field (N≧(U+L)) and the exponent is stored as an integer in the lower L bits. For the multiplication of two real numbers represented in such a format, these two real numbers are multiplied as fixed point numbers so as to make only the upper significant bits of the multiplication result a mantissa, while these two real numbers are added as integers so as to make only the lower significant bits of the addition result an exponent. As a result, the multiplication result can be obtained in a floating point format.

REFERENCES:
patent: 4594679 (1986-06-01), George et al.
patent: 6990505 (2006-01-01), Ahmed
patent: 2002/0026468 (2002-02-01), Miyasaka et al.
“The IEEE 754 Standard for Floating Point Arithmetic”, Institute of Electrical and Electronics Engineers, pp. 1-2, Nov. 10, 1999.

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