Obtains the current system cycle count. To convert to time, use a frequency of 50 MHz. The time unit is us, and the conversion formula is: time = (cycle count / 50) us.
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Returns the system cycle count.
PIPE_S
This interface runs on the PIPE_S pipeline. If you need to measure the instruction time of other pipelines, you must insert the corresponding pipeline synchronization before calling this interface.
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