; Hacker's Delight, page 15, rules s - v
1 var 8 x
2 var 8 y
3 one 8

4 xnor 8 1 2
5 and 8 1 2
6 or 8 1 2
7 sub 8 5 6
8 sub 8 7 3
9 ne 1 4 8

10 add 8 5 -6
11 ne 1 4 10

12 and 8 1 -2
13 add 8 12 2
14 ne 1 6 13

15 or 8 -1 2
16 sub 8 15 -1
17 ne 1 5 16

18 or 1 9 11
19 or 1 14 17
20 or 1 18 19
21 root 1 20