Apparatus and method for providing extended address modes in...

Electrical computers and digital processing systems: processing – Processing control – Specialized instruction processing in support of testing,...

Reexamination Certificate

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Reexamination Certificate

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07380109

ABSTRACT:
An apparatus and method are provided for extending a microprocessor instruction set to allow for extended size addresses. The apparatus includes translation logic and extended execution logic. The translation logic translates an extended instruction into an associated micro instruction sequence for execution by the microprocessor, where the extended instruction has an extended prefix and an extended prefix tag. Extended prefix specifies an extended address mode for an address calculation corresponding to an operation, where the extended address mode not otherwise provided for by instructions in an existing instruction set. The extended prefix tag indicates the extended prefix, where the extended prefix tag is an otherwise architecturally specified opcode within the existing instruction set. The extended execution logic is coupled to the translation logic. The extended execution logic receives the associated micro instruction sequence, and performs the address calculation to generate an extended address according to the extended address mode.

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