Processing a micro-operation may include providing information to an event handler indicating which of multiple sets of data caused events during processing of a single instruction on multiple sets of data in parallel. The event handler may access the provided information to simplify handling of data sets that did not cause an event. Handling the data sets may include the event handler determining a result for data sets that caused events, accessing results determined outside of the event handler for data sets that did not cause an event, and accumulating all of the results.