Reading prediction outcomes within a branch prediction...

Details Reading prediction outcomes within a branch prediction... Reading prediction outcomes within a branch prediction...

2005-04-20

2008-11-04

Chan, Eddie P (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Branching

C712S238000, C712S239000

Reexamination Certificate

active

07447885

ABSTRACT:
A branch prediction mechanism includes a history value register storing a history value which is used to address into a history buffer from which a plurality of prediction values are read and stored into a prediction value store. The one or more prediction values to be used with a potential branch instruction are selected from the prediction values store using a multiplexer switched by a branch predicting portion of a fetch address. The history buffer is only read when the history value changes whereas the prediction values store is read each time a potential branch instruction is identified requiting a prediction value to be associated with it. The reduced duty cycle of the history buffer saves power.

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Related U.S. Appl. No. 11/109,957, filed Apr. 20, 2005, Elwood.
Related U.S. Appl. No. 10/994,179, filed Nov. 22, 2004, Elwood.
Related U.S. Appl. No. 11/095,655, filed Apr. 1, 2005, Elwood et al.
Related U.S. Appl. No. 11/121,184, filed May 4, 2005, Elwood et al.

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