Branch target buffer addressing in a data processor

Details Branch target buffer addressing in a data processor Branch target buffer addressing in a data processor

2011-01-18

2011-01-18

Pan, Daniel (Department: 2183)

Electrical computers and digital processing systems: processing

Processing control

Branching

C712S238000, C712S239000

Reexamination Certificate

active

07873819

ABSTRACT:
A branch target buffer (BTB) receives, from a processor, a current fetch group address which corresponds to a current fetch group including a plurality of instructions. In response to the current fetch group address resulting in a group hit in the BTB, the BTB provides to the processor a branch target address corresponding to a branch instruction within the current fetch group which is indicated by a control field as valid and predicted taken. The BTB generates the branch target address using an unshared lower order target portion, corresponding to the branch instruction and located within the entry of the BTB which caused the group hit, and one of a shared higher order target portion located within the entry of the BTB which caused the group hit or a higher order portion of the current fetch group address based on a value of the control field.

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