MSVC optimizer bug

main.cpp

#include <iostream>

using namespace std;

int main()
{
   int A[12] = {
      1, 1, 1, 1,
      1, 1, 1, 1,
      1, 1, 1, 1
   };
  
   int sum = 0;
   for (int i = 0; i <= 11; ++i)
   {
      sum += A[11 - i];
   }

   cout << sum << endl;
   cin.get();
   return 0;
}