Pre-decoding variable length instructions

Details Pre-decoding variable length instructions Pre-decoding variable length instructions

2011-06-14

2011-06-14

Chan, Eddie P (Department: 2183)

Electrical computers and digital processing systems: processing

Instruction decoding

Predecoding of instruction component

C712S210000, C712S227000

Reexamination Certificate

active

07962725

ABSTRACT:
A pre-decoder in a variable instruction length processor indicates properties of instructions in pre-decode bits stored in an instruction cache with the instructions. When all the encodings of pre-decode bits associate with one length instruction are defined, a property of an instruction of that length may be indicated by altering the instruction to emulate an instruction of a different length, and encoding the property in the pre-decode bits associated with instructions of the different length. One example of a property that may be so indicated is an undefined instruction.

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