Apparatus for processing floating-point data having exponents of

Details Apparatus for processing floating-point data having exponents of Apparatus for processing floating-point data having exponents of

1985-09-05

1988-07-19

Harkcom, Gary V.

Boots, shoes, and leggings

235310, G06F 748, G06F 500

Patent

active

047589736

ABSTRACT:
A floating-point data processing apparatus operates to generate exponent data of fixed length from floating-point data composed of (a) a sign bit indicating a mantissa sign, (b) a first exponent part which has bit length determined in dependence upon a significant bit length necessary for binary expression of an exponent and which has all its bits determined at 1 or 0 in dependence upon the mantissa sign and the sign of said exponent, (c) a second exponent part which has its bit length determined in dependence upon the bit length of the first exponent part, which has a predetermined relationship determined in dependence upon the sign of the exponent and the mantissa sign with the significant bit part when the exponent is expressed in binary form, and the leading bit of which has a value different from the value of one bit of said first exponent part, and (d) a mantisa part which has a plurality of bits having a bit length determined in dependence upon the value of the exponent. The exponent data of fixed length is composed of a sign bit part having a plurality of bits having values indicating the sign of the exponent and a significant bit part having a plurality of bits indicating the values of the exponent.

REFERENCES:
patent: 3742198 (1973-06-01), Morris
patent: 4617641 (1986-10-01), Hamada
patent: 4675809 (1987-06-01), Omoda et al.
Morris, "Tapered Floating Point: A New Floating-Point Representation", IEEE Trans. on Computers, Dec. 1971, pp. 1578-1579.
Matsui et al., "An Overflow/Underflow-Free Floating-Point Representation of Numbers", J. of Infor. Processing, vol. 4, No. 3, 1981, pp. 123-133.
Patent Abstracts of Japan, vol 8, No 101, p. P-273 [1538], May 12, 1984; (JP-A-59 11 444, Jan. 21, 1984).

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