Efficient firm consistency support mechanisms in an out-of-order

Details Efficient firm consistency support mechanisms in an out-of-order Efficient firm consistency support mechanisms in an out-of-order

1994-12-09

1997-12-16

Lall, Parshotam S.

395468, 395477, 395800, G06F 9312, G06F 938

Patent

active

056995385

ABSTRACT:
Two processor controls for supporting efficient Firm Consistency while allowing out-of-order execution of Load instructions is provided. The Touch control operates when the processor stores a subsequent Store in a pending Store buffer while awaiting any outstanding Loads or Stores. The efficiency of the pending Store is improved by issuing a Touch of the data which pre-loads the line of data in the cache that is the subject of the store. The processor can complete out-of-order execution of a subsequently issued Load relative to a prior Load, but only to its finished state. The subsequently issued Load is not allowed to complete until the prior Load is completed. The Finished Load Cancellation control ensures that Firm Consistency is maintained by canceling any finished Loads, and subsequent instructions, when the subject of the Load is the same as an invalidation request from a multiprocessor.

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