Aside: this test code would have been a bit easier to debug if it had used decimal bases. That is, replace int a[] = {10,20,30}; int r = 1 * a[i++] + 2 * a

Aside: this test code would have been a bit easier to debug if it had used decimal bases. That is, replace int a[] = {10,20,30}; int r = 1 * a[i++] + 2 * a[i++] + 3 * a[i++]; with int a[] = {1,2,3}; int r = 1 * a[i++] + 10 * a[i++] + 100 * a[i++]; Then if your program outputs r = 111, it's obvious that it's doing a[0] + 10*a[0] + 100*a[0] and if it outputs 321, it's obvious that it's doing a[0] + 10*a[1] + 100*a[2] No disassembly required.