; Get a hard copy on Amazon for $10.

[0x31]
dec [xchg rax,rax] inc 
mov      rcx,rax
shr      rcx,1
xor      rcx,rax

inc      rax

mov      rdx,rax
shr      rdx,1
xor      rdx,rax

xor      rdx,rcx
; xorpd(&)xorpd.net