Apparatus to dynamically control the out-of-order execution of l

Details Apparatus to dynamically control the out-of-order execution of l Apparatus to dynamically control the out-of-order execution of l

1995-12-01

1997-03-25

Treat, William M.

395585, 395392, G06F 938

Patent

active

056153503

ABSTRACT:
An apparatus to dynamically controls the out-of-order execution of load/store instructions by detecting a store violation condition and avoiding the penalty of a pipeline recovery process. The apparatus permits a load and store instruction to issue and execute out of order and incorporates a unique store barrier cache which is used to dynamically predict whether or not a store violation condition is likely to occur and, if so, to restrict the issue of instructions to the load/store unit until the store instruction has been executed and it is once again safe to proceed with out-of-order execution. The method implemented by the apparatus delivers performance within one percent of theoretically possible with apriori knowledge of load and store addresses.

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