; if (length == 0)
;   length = 1;
; endif
    
if:        
    mov rax,qword ptr [length]
    test rax,rax
    jne endif
    
    mov qword ptr [length],1
    
endif:


if:        
    mov rax,qword ptr [length]

    cmp rax,0
    jne endif
    
    mov qword[length],1
    
endif: