Electrical computers and digital processing systems: processing – Processing control – Processing control for data transfer
Reexamination Certificate
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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Col Gerard M.
Henry G. Glenn
Parks Terry
Huffman James W.
Huffman Richard K.
IP-First LLC
Tsai Henry W. H.
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