Scoreboard table for a counterflow pipeline processor with instr

Details Scoreboard table for a counterflow pipeline processor with instr Scoreboard table for a counterflow pipeline processor with instr

1995-08-26

1997-10-28

Lall, Parshotam S.

395394, 395800, G06F 938

Patent

active

056824939

ABSTRACT:
A counterflow pipeline having a scoreboard table and a register file is disclosed. In the counterflow pipeline, information flows in two directions. Instructions flow up the pipeline during execution. The results from previous instructions flow down the same pipeline. As an instruction meets a result that is needed by that instruction, that result is garnered. The scoreboard table maintains a record of the registers values that are being recomputed in the counterflow pipeline at any given point in time. When a new instruction enters the counterflow pipeline, the register values it needs are compared to the record of register values being recomputed or otherwise stored in the scoreboard table. If a match occurs, the source value is not fetched from the register file. Rather, the needed source value is garnered in the counter flow pipeline. By this procedure, the number of times the register file need be accessed is significantly reduced.

REFERENCES:
patent: 5471591 (1995-11-01), Edmondson et al.
patent: 5488729 (1996-01-01), Vegesna et al.
patent: 5574939 (1996-11-01), Keckler et al.

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