Selective poisoning of data during runahead
A run-ahead, selected technology used in electrical digital data processing, concurrent instruction execution, machine execution devices, etc., to solve problems such as polluting caches
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[0009] In modern microprocessors, instructions are often executed in a pipeline. Such instructions may be issued to individual execution mechanisms in the pipeline either individually or as bundles of micro-ops. Regardless of the form in which an instruction is issued for execution, when the instruction is issued, it may be dispatched without knowing whether a miss or exception will occur during execution of the instruction. It can take some time to resolve some misses / exceptions before the microprocessor is able to make progress on subsequent instructions. This way, the microprocessor can stall while trying to resolve the root cause of the long latency event.
[0010] Some microprocessors can be configured to execute instructions prospectively while the root cause of the stall is being resolved. Proactive execution is typically directed at discovering other potential stalls so that the microprocessor can begin to resolve those stalls as well, potentially saving processing t...
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