Electrical computers and digital processing systems: processing – Processing control – Branching
Reexamination Certificate
2007-10-02
2007-10-02
Chan, Eddie (Department: 2183)
Electrical computers and digital processing systems: processing
Processing control
Branching
Reexamination Certificate
active
11144206
ABSTRACT:
A microprocessor includes two branch history tables, and is configured to use a first one of the branch history tables for predicting branch instructions that are hits in a branch target cache, and to use a second one of the branch history tables for predicting branch instructions that are misses in the branch target cache. As such, the first branch history table is configured to have an access speed matched to that of the branch target cache, so that its prediction information is timely available relative to branch target cache hit detection, which may happen early in the microprocessor's instruction pipeline. The second branch history table thus need only be as fast as is required for providing timely prediction information in association with recognizing branch target cache misses as branch instructions, such as at the instruction decode stage(s) of the instruction pipeline.
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Bridges Jeffrey Todd
Dieffenderfer James Norris
Sartorius Thomas Andrew
Smith Rodney Wayne
Stempel Brian Michael
Agusta Joseph B.
Chan Eddie
Ciccozzi John L.
Huisman David J.
Pauley Nicholas J.
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