1 {
2   for (int c0 = 0; c0 < n - 31; c0 += 32)
3     for (int c1 = 0; c1 <= n; c1 += 32) {
4       if (n >= c1 + 32) {
5         for (int c2 = 0; c2 <= 31; c2 += 1)
6           for (int c3 = 0; c3 <= 31; c3 += 1)
7             S_1(c0 + c2, c1 + c3);
8       } else
9         for (int c2 = 0; c2 <= 31; c2 += 1) {
10           for (int c3 = 0; c3 < n - c1; c3 += 1)
11             S_1(c0 + c2, c1 + c3);
12           S_2(c0 + c2);
13         }
14     }
15   for (int c1 = 0; c1 < n; c1 += 32) {
16     if (n >= c1 + 32) {
17       for (int c2 = 0; c2 < n % 32; c2 += 1)
18         for (int c3 = 0; c3 <= 31; c3 += 1)
19           S_1(-((n - 1) % 32) + n + c2 - 1, c1 + c3);
20     } else
21       for (int c2 = 0; c2 < n - c1; c2 += 1) {
22         for (int c3 = 0; c3 < n - c1; c3 += 1)
23           S_1(c1 + c2, c1 + c3);
24         S_2(c1 + c2);
25       }
26   }
27 }
28