; Hacker's Delight, page 22, comparison predicates 
1 var 8 x
2 var 8 y 

3 eq 1 1 2
4 sub 8 1 2
5 sub 8 2 1
6 or 8 4 5
7 slice 1 6 7 7
8 eq 1 3 -7

9 eq 1 -3 7

10 or 1 -8 -9
11 root 1 10