Apparatus for computing a sticky bit for a floating point arithm

Details Apparatus for computing a sticky bit for a floating point arithm Apparatus for computing a sticky bit for a floating point arithm

1991-07-01

1995-07-11

Shin, Christopher B.

Electric lamp and discharge devices: consumable electrodes

With economizer

364745, 364768, 36471508, G06F 738

Patent

active

054327270

ABSTRACT:
An arithmetic unit wherein a plurality of electrical signals corresponding to the mantissa is shifted and a bit signal corresponding to the sticky bit is calculated simultaneously with the calculation of the shift count. Initially, a serial approach to mantissa shifting and sticky bit calculation is employed. A parallel approach to matissa shifting and sticky bit calculation is adopted when all shift count bits are available. In one embodiment of the present invention, an exclusive OR gate is used to calculate the difference between the least significant bits of the first and second exponents. A shifter/sticky bit calculator immediately acts upon the output of the exclusive OR gate and begins shifting the mantissa and calculating the guard, round, and sticky bits. The more significant bits of the shift count are progressively generated thereafter, and the guard, round and sticky bits are calculated and the mantissa is shifted as the shift count bits become available. As soon as all shift count bits are available, a parallel approach to sticky bit calculation is adopted. Consequently, the shifted mantissa and the guard, round and sticky bits are available at the same time and much earlier than if the sticky bit were calculated according to known methods.

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