Operand specifier processing

Details Operand specifier processing Operand specifier processing

G - Physics

06

F

354/230.72

G06F 9/26 (2006.01) G06F 9/22 (2006.01) G06F 9/30 (2006.01) G06F 9/34 (2006.01)

Patent

CA 1321652

OPERAND SPECIFIER PROCESSING ABSTRACT A method of specifying the operands for a microcoded CPU employs a combination of a set of microinstruction routines for generic operand modes, along with hardware primitives for selecting various specific types of operand treatment. Decode of a machine-level instruction produces an entry point for the microstore to select one of the set of generic operand modes, and also decode of the instruction produces control bits that are used directly to select the specific operand type or use by the hardware primitives. In this way, branching is avoided in the microinstruction sequences for operand specifying, but yet the amount of microcode needed is a minimum.

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