"Favor readability over bare-metal."

LOL

http://git.2f30.org/sbase/commit/?id=bd6f8304fdf98433027e2bced868711270614696

>>13
Your code is bloated and does not follow any calling convention.

Here, this follows X86_64 convention and only takes 13 bytes.

; first arg: pointer to null terminated string to check for dubs
; return value: 0 if dubs, non 0 if not dubs
dubs:
push rax
lodsb
test al, al
jz .L1
pop rdx
jmp dubs
.L1: pop rax
xor al, dl
ret