Fixed-point data/floating-point data converting apparatus

Details Fixed-point data/floating-point data converting apparatus Fixed-point data/floating-point data converting apparatus

1984-01-24

1986-12-23

Thomas, James D.

Boots, shoes, and leggings

364715, 235310, G06F 738, G06F 500

Patent

active

046316965

ABSTRACT:
A fixed-point data/floating-point data converting apparatus has: a priority encoder with input terminals respectively receiving output signals from logic gates (first logic gates) for use in detecting whether or not all of the digits fixed-point data are "0", to obtain a number of continuous "zero" digits from the most significant digit of the fixed-point data, in accordance with the contents of the signals received thereby; a shifter for shifting the fixed-point data to the left by the number of digits of continuous "zero" digits, thereby obtaining a mantissa part; an adder for subtracting the number of continuous "zero" digits from a reference value, thereby obtaining an exponent part; and a data selector for generating the floating-point data in accordance with the subtraction results from the adder, the shift results from the shifter, all-zero data, and an output signal from the logic gate (first logic gate) for detecting whether or not all digits of the fixed-point data are "0", in response to the output signals from the logic gates (second logic gates). In this converting apparatus, the data selector selects the all-zero data, as floating-point data, when all of the digits of the fixed-point data are "0". Otherwise, the data selector selects, as floating-point data, data including the subtraction results supplied from the adder and the shift results supplied from the shifter.

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patent: 4038538 (1977-07-01), Semmelhaack et al.
patent: 4189715 (1980-02-01), Duttweiler
patent: 4475173 (1984-10-01), Talmi
patent: 4511990 (1985-04-01), Hagiwara et al.
patent: 4553133 (1985-11-01), Peterson et al.
patent: 4559620 (1985-12-01), Blair

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