Shift prefix instruction decoder for modifying register...

Details Shift prefix instruction decoder for modifying register... Shift prefix instruction decoder for modifying register...

2008-03-04

2008-03-04

Meonske, Tonia L. (Department: 2181)

Electrical computers and digital processing systems: processing

Instruction decoding

Predecoding of instruction component

C712S212000, C712S200000, C712S226000

Reexamination Certificate

active

07340589

ABSTRACT:
The data processing device and electronic equipment of the present invention perform pipeline control and include a fetch circuit which fetches instruction codes of a plurality of instructions in instruction queues. A prefix instruction decoder circuit performs a decode processing only on a prefix instruction. The prefix instruction decoder circuit receives the instruction code before decoding, judges whether or not the instruction is a given prefix instruction, and causes a target instruction to modify an information register to store information necessary for decoding a target instruction when the instruction is the given prefix instruction. A decoder circuit receives each of the instruction codes of the instructions other than the prefix instruction as a decode instruction and decodes the decode instruction. When the decode instruction is a target instruction, the target instruction modified by the prefix instruction is decoded based on the target instruction modifying information.

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