Pipelined microprocessor with branch misprediction cache circuit

Details Pipelined microprocessor with branch misprediction cache circuit Pipelined microprocessor with branch misprediction cache circuit

1997-06-13

1999-03-09

Lall, Parshotam S.

395395, G06F 938

Patent

active

058812776

ABSTRACT:
A microprocessor comprising an instruction pipeline (36) comprising a plurality of successive instruction stages. An instruction passes from a beginning stage (38), through a plurality of intermediary stages (40 through 52), and to an ending stage (54) of the plurality of successive instruction stages. The microprocessor also comprises a storage circuit (58) coupled to receive program thread information output from a first stage (48) of the intermediary stages. Still further, the microprocessor comprises selection circuitry (56) comprising a first input, a second input, and an output for outputting output information from its first and second inputs. The first input of the selection circuitry is coupled to receive output information output from the first stage. The second input of the selection circuitry is coupled to receive program thread information output from the storage circuit. The output of the multiplexer is coupled to an input of a second stage (50) of the intermediary stages, wherein the second stage follows the first stage. Other circuits, systems, and methods are also disclosed and claimed.

REFERENCES:
patent: 4638423 (1987-01-01), Ballard
patent: 4851993 (1989-07-01), Chen et al.
patent: 5193157 (1993-03-01), Barbour et al.
patent: 5442760 (1995-08-01), Rastad et al.
patent: 5642493 (1997-06-01), Burgess
patent: 5687338 (1997-11-01), Boggs et al.

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