Uniform register addressing using prefix byte

Details Uniform register addressing using prefix byte Uniform register addressing using prefix byte

2005-12-27

2005-12-27

Chan, Eddie (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Instruction modification based on condition

C712S208000

Reexamination Certificate

active

06981132

ABSTRACT:
A processor changes the mapping of register addresses to registers dependent on an instruction field. In one particular embodiment, the mapping may be changed for byte addressing of the registers. A register mapping in which each register address maps to either the least significant byte or the next least significant byte of a subset of the registers may be supported, as well as a register mapping in which each register address maps to the least significant byte of each register, in one implementation. In one particular implementation, the instruction field may be a prefix field (e.g. a prefix byte). The processor may provide for uniform addressing of registers (e.g. byte addressing of the registers) responsive to a prefix field, in other embodiments, irrespective of the addressing provided if the prefix field is not included, or is encoded differently than the encoding which results in the uniform addressing.

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