1long long acc;
2
3addhi (short a)
4{
5  acc += (long long) a << 32;
6}
7
8subhi (short a)
9{
10  acc -= (long long) a << 32;
11}
12
13main ()
14{
15  acc = 0xffff00000000ll;
16  addhi (1);
17  if (acc != 0x1000000000000ll)
18    abort ();
19  subhi (1);
20  if (acc != 0xffff00000000ll)
21    abort ();
22  exit (0);
23}
24