gistfile1.txt

  gcc simvm.c
  time ./a.out
  857419840

  real   0m0.374s
  user   0m0.359s
  sys    0m0.003s

------

  gcc -O3 simvm.c -o fast.out
  time ./fast.out 
  857419840
  
  real  0m0.006s
  user  0m0.001s
  sys   0m0.003s