Apparatus and method for masked move to and from flags...

Details Apparatus and method for masked move to and from flags... Apparatus and method for masked move to and from flags...

2006-07-11

2006-07-11

Tsai, Henry W. H. (Department: 2181)

Electrical computers and digital processing systems: processing

Processing control

Processing control for data transfer

C712S005000

Reexamination Certificate

active

07076639

ABSTRACT:
A method and apparatus are provided for writing to a flags register in a pipeline microprocessor. Responsive to a macro instruction that directs a write to the flags register, a mask is generated using destination information for the write and privilege level information for the write, where the mask permits updates of particular bits within the flags register that are appropriate for the current operating mode. The mask is then ANDed with new values for bits within the flags register and the result is written to the flags register in a single instruction cycle.

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