Multi-issue/plural counterflow pipeline processor

Details Multi-issue/plural counterflow pipeline processor Multi-issue/plural counterflow pipeline processor

1997-05-09

1998-11-17

Lall, Parshotam S.

39580001, G06F 938

Patent

active

058389393

ABSTRACT:
A computer system architecture is described for providing increased performance in a counterflow pipeline processor. The system includes an instruction fetching unit, a register file, and a pipeline connected between the instruction fetching unit and the register file. The pipeline is formed from a group of sequential stages. Each stage in the pipeline includes a first instruction register for storing a first instruction, a second instruction register for storing a second instruction, and a first results register for storing results. The instructions are transferred in a first direction from stage to stage, and results are transferred in an opposite direction from stage to stage. The registers for the instructions include an operand field, a first source field for the operand, a second source field for the operand, and a destination field. Each of the fields itself includes a register name, a value, and a validity bit. In operation instructions and results pass each other in the pipeline and the results of execution of the instructions are transferred to the register file and to the results fields. In another approach to providing improved performance plural pipelines are employed, individual ones of which may have multiple instruction registers therein.

REFERENCES:
patent: 4916606 (1990-04-01), Yamaoka et al.
patent: 4964046 (1990-10-01), Mehrgardt et al.
patent: 5187800 (1993-02-01), Sutherland
patent: 5488729 (1996-01-01), Vegesna et al.

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