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This operation starts by clearing a recursion count variable to zero before making the first call to a recursive function. The function increments the count variable then checks to see if the variable has reached 5.
If the variable is less than 5 the function calls itself. If the count variable equals 5 the function returns and the call stack unwinds. The variable can only be 5 if the function has recursively called itself four time, making five calls in total.
In addition to conditional branching, this operation tests the overhead of a C function call. A recursive function was necessary to prevent some compiler optimizers removing the call all together.
The operation was performed ten times within the measured period - making fifty function calls in total.
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