Processor with conditional instruction execution based upon...

Electrical computers and digital processing systems: processing – Processing control – Instruction modification based on condition

Reexamination Certificate

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Reexamination Certificate

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06910123

ABSTRACT:
A processor having a changeable architected state. The processor includes an instruction memory for storing instructions. The processor also includes an instruction pipeline, where an instruction which passes entirely through the pipeline alters the architected state. Further, the pipeline comprises circuitry for fetching instructions from the instruction memory into the pipeline. The processor also includes circuitry for storing an annul code corresponding to instructions in the pipeline. Finally, the processor includes circuitry for preventing (FU1through FU8) one or more selected instructions in the group from altering the architected state in response to the annul code.

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