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// { dg-do run }

// { dg-options "-O2" }

// We used to mis-compile this testcase as we did not know that

// &a+offsetof(b,a) was the same as &a.b

struct Iterator {

    int * ptr;

    Iterator(int * i) : ptr(i) { }

    void operator++() { ++ptr; }

    int *const & base() const { return ptr; }

};

Iterator find_7(Iterator first, Iterator last)

{

  int trip_count  = (last.base() - first.base()) >> 1;

  for ( ; trip_count > 0 ; --trip_count) {

    if (*first.ptr == 7) return first;

    ++first;

    if (*first.ptr == 7) return first;

    ++first;

  }

  switch(last.base() - first.base()) {

    case 1:

          if (*first.ptr == 7) return first;

          ++first;

    case 0:

    default:

          return last;

  }

}

int main() {

  int as[5] = {4,4,4,4,7};

  return (find_7(Iterator(&as[0]), Iterator(&as[5])).ptr == &as[5]);

};