using icpc, what is the best way to optimize the following code with AVX option?

I have a for loop to identify min and max of a float array. Here is my implementation:

for (int i = 0; i < counter; i++) {

     imin = intervals[i] < imin ? intervals[i] : imin;

     imax = intervals[i] > imax ? intervals[i] : imax;

   }

What is the best way to optimize the code here? I am using -xAVX option and I am running the program in single thread mode. How does this compare to using std::minmax_element? 

Should I write some manual AVX code?

Thanks,