System and method to stall dispatch of gathered store...

Details System and method to stall dispatch of gathered store... System and method to stall dispatch of gathered store...

2006-08-08

2006-08-08

Sparks, Donald (Department: 2185)

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

C710S054000, C711S122000, C711S145000, C712S225000

Reexamination Certificate

active

07089364

ABSTRACT:
A method and processor system that substantially enhances the store gathering capabilities of a store queue entry to enable gathering of a maximum number of proximate-in-time store operations before the entry is selected for dispatch. A counter is provided for each entry to track a time since a last gather to the entry. When a new gather does not occur before the counter reaches a threshold saturation point, the entry is signaled ready for dispatch. By defining an optimum threshold saturation point before the counter expires, sufficient time is provided for the entry to gather a proximate-in-time store operation. The entry may be deemed eligible for selection when certain conditions occur, including the entry becoming full, issuance of a barrier operation, and saturation of the counter. The use of the counter increases the ability of a store queue entry to complete gathering of enough store operations to update an entire cache line before that entry is dispatched to an RC machine.

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Pekkala et al., “Gathering Store Instructions In a Superscalar Processor”, Sep. 1996, IBM Technical Disclosure Bulletin, vol. 39, No. 09, pp. 103-106.

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