Condition code producing system

A condition code producing system for an arithmetic unit having a bus, said arithmetic unit being controlled by a micro program of microinstructions and operating on precision and data portions of binary floating point data, said condition code producing system producing a condition code having a plurality of bits and describing an attribute of the binary floating point data, said condition code producing system comprising:

• storing means for storing each bit of the condition code;
• detection signal producing means for producing a plurality of detection signals from values of predetermined bits of the binary floating point data transferred to said bus within said airthmetic unit by an executing micro instruction performing data transfer, the executing micro instruction being one of the micro instructions constituting said micro program, the executing micro instruction comprising a condition control field constituted by a plurality of bits having values depending on at least the precision and data portions of the binary floating point data being transferred;
• and
• setting means for producing a new condition code from said plurality of detection signals and from the condition code already stored in said storing means depending on a value of said condition control field and for setting said new condition code in said storing means.