How to optimize the following hotspot in the code reported by Vtune Amplifier?

The following code snippet is reported as the top hotspot :

i = some positive int
j = some positive int
L = some positive int

//j < i
x = some positive int
p = some prime number ( int)

while (i < L)
{
	arr[i] = arr[i] + x;      //this line is reported to be the hotspot
	arr[j] = arr[j] + x;
	i = i + p;
	j = j + p;
}