; Get a hard copy on Amazon for $10.

[0x0c]
dec [xchg rax,rax] inc
mov      rcx,rax
xor      rcx,rbx
ror      rcx,0xd

ror      rax,0xd
ror      rbx,0xd
xor      rax,rbx

cmp      rax,rcx
; xorpd(&)xorpd.net