Specialized millicode instructions for test PSW validity, load w

Details Specialized millicode instructions for test PSW validity, load w Specialized millicode instructions for test PSW validity, load w

1995-03-31

1997-12-02

Lall, Parshotam S.

395595, G06F 9305

Patent

active

056945876

ABSTRACT:
A pipelined computer processor in a milli-mode architected state tests the validity of a program status word with a mask stored in a millicode general register. The mask indicates bits in the program status word which are to be zeros if the word is valid. A logical AND operation is performed between correspondingly positioned bits in the word and bits in the mask and in addition the status of at least one other bit in the word is checked, a bit other than a correspondingly positioned bit.

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