It doesn't get TCOd, the compiler simply recognizes what it does and optimizes it. It does literally same thing with the code below. int count(int n) {

It doesn't get TCOd, the compiler simply recognizes what it does and optimizes it. It does literally same thing with the code below. int count(int n) { int res = 0; for (int i=0; i < n; i++) res++; return res; }