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When using the Performance Monitoring Unit to count runtime events the counter registers are limited...

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When using the Performance Monitoring Unit to count runtime events the counter registers are limited to 32-bits. How can more than 2A32 events be counted without significantly impacting the software performance?

A.

Register an interrupt which is triggered when the counter overflows

B.

Count the events using a 64-bit VFP register

C.

Allow one event type to use concatenated counter registers

D.

Poll the event counter, resetting it when the counter is close to overflowing

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