; Hacker's Delight, page 15, rules n - r
1 var 8 x
2 var 8 y

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

8 and 8 1 -2
9 sub 8 4 2
10 ne 1 8 9

11 sub 8 1 5
12 ne 1 8 11

13 one 8
14 sub 8 1 2
15 sub 8 2 1
16 sub 8 15 13
17 ne 1 -14 16

18 add 8 -1 2
19 ne 1 -14 18

20 or 1 7 10
21 or 1 12 17
22 or 1 20 21
23 or 1 22 19
24 root 1 23