Last branch records div.c example

      1 /* div.c */
      2 volatile int count;
      3 
      4 __attribute__((noinline))
      5 int compute_flag(int i)
      6 {
      7         if (i % 10 < 4)          /* ... in 40% of the iterations */
      8                 return i + 1;
      9         return 0;
     10 }
     11 
     12 int main(void)
     13 {
     14         int i;
     15         int flag;
     16         volatile double x = 1212121212, y = 121212; /* Avoid compiler optimizing away */
     17 
     18         for (i = 0; i < 2000000000; i++) {
     19                 flag = compute_flag(i);
     20         
     21                 /* Some other code */
     22                 count++;
     23 
     24                 if (flag)
     25                         x += x / y + y / x;     /* Execute expensive division if flag is set */
     26         }
     27         return 0;
     28 }