Condition code producing system

Details Condition code producing system Condition code producing system

1986-06-16

1988-11-29

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 738

Patent

active

047886552

ABSTRACT:
A condition code producing system for an arithmetic unit which is controlled by a micro program and operate on binary floating point data produces a condition code having a plurality of bits and describing an attribute of the binary floating point data. The condition code producing system comprises: a storing device for storing each bit of the condition code; a device for producing a plurality of detection signals from values of predetermined bits of the binary floating point data. This data is transferred to a bus within the arithmetic unit by a micro instruction which involves a data transfer, where the micro instruction is one of a plurality of micro instructions constituting the micro program. The micro instruction comprises a condition control field constituted by a plurality of bits having values depending on at least precision and data portions of the binary floating point data which is transferred. The system also includes a device for producing a new condition code from the plurality of detection signals and the condition code already stored in the storing device depending on a value of the condition control field and for setting the new condition code in the storing device.

REFERENCES:
patent: 4377846 (1883-03-01), Yoshida
patent: 4683546 (1987-07-01), Boney

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