(a) 
void f(int* p) {
  for (int i = 0; i < 10; ++i) {
    g(p);
    h(*p);
  }
}

(b) 
void f(int* p) {
  int x = *p;
  for (int i = 0; i < 10; ++i)  {
    g(p);
    h(x);
  }
}

Example 5: Avoiding aliasing problems. (a) Obvious implementation; (b) version that tells the compiler that g does not modify *p.