How to run one specific PTX instruction repeatly?

I want to make one specific PTX instruction run for many times. How to do with that?

I used to use inline PTX to program, but I found the loop is not correct. The problem is already put onto this forum yestoday.

I try to write pure PTX code to relize this goal. But I can’t compile the PTX code into executable file.

So anyone could give me some hints to do with this goal? Thank you!!