Data processing system having a synchronizing link stack and met

Details Data processing system having a synchronizing link stack and met Data processing system having a synchronizing link stack and met

1997-06-03

2000-12-05

An, Meng-Ai T.

Electrical computers and digital processing systems: processing

Processing control

Branching

712239, G06F 942

Patent

active

061579998

ABSTRACT:
When a request to branch to an address stored in a return memory location (440) occurs, a busy bit is used to determine whether the return memory location (440) contains updated information. When the information is not updated, a predicted address is provided to the prediction verifier (460) by the link stack (410). Once the busy bit is valid, the prediction verifier (460) determines if a proper prediction was made. When an improper prediction was made, the update portion (415) of the link stack (410) based on information from the comparator (425) determines if a value stored in the link stack (410) matches the value stored in the return memory location (440). The link stack (410) is synchronized based upon a favorable comparison indicating the return memory location value matches a value in the link stack. If a match is not found, the predicted address is placed back on the link stack or alternatively the link stack is cleared.

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