Issuing load-dependent instructions in an issue queue in a processing unit of a data processing system
A system and method for issuing load-dependent instructions in an issue queue in a processing unit. A load miss queue is provided. The load miss queue comprises a physical address field, an issue queue position field, a valid identifier field, a source identifier field, and a data type field. A load...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | A system and method for issuing load-dependent instructions in an issue queue in a processing unit. A load miss queue is provided. The load miss queue comprises a physical address field, an issue queue position field, a valid identifier field, a source identifier field, and a data type field. A load instruction that misses a first level cache is dispatched, and both the physical address field and the data type field are set. A load-dependent instruction is identified. In response to identifying the load-dependent instruction, each of the issue queue position field, valid identifier field, and source identifier field are set. If the issue queue position field refers to a flushed instruction, the valid identifier field is cleared. The load instruction is recycled, and a value of the valid identifier field is determined. The load-dependent instruction is then selected for issue on a next processing cycle independent of an age of the load-dependent instruction. |
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