System and method for extraction, alignment and decoding of CISC

Details System and method for extraction, alignment and decoding of CISC System and method for extraction, alignment and decoding of CISC

1992-03-31

1995-08-01

Lall, Parshotam S.

Boots, shoes, and leggings

364DIG1, 36423222, 3642597, 3642599, G06F 930, G06F 9312, G06F 9315, G06F 9318

Patent

active

054386683

ABSTRACT:
A system and method for extracting complex, variable length computer instructions from a stream of complex instructions each subdivided into a variable number of instructions bytes, and aligning instruction bytes of individual ones of the complex instructions. The system receives a portion of the stream of complex instructions and extracts a first set of instruction bytes starting with the first instruction bytes, using an extract shifter. The set of instruction bytes are then passed to an align latch where they are aligned and output to a next instruction detector. The next instruction detector determines the end of the first instruction based on said set of instruction bytes. An extract shifter is used to extract and provide the next set of instruction bytes to an align shifter which aligns and outputs the next instruction. The process is then repeated for the remaining instruction bytes in the stream of complex instructions. The isolated complex instructions are decoded into nano-instructions which are processed by a RISC processor core.

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