.intel_syntax noprefix
.global fib

fib:
        cmp rdi, 1
        jg L1
        mov rax, rdi
        ret
L1:
        sub rdi, 1
        push rdi
        call fib
        mov rsi, rax
        pop rdi
        push rsi
        sub rdi, 1
        call fib
        pop rsi
        add rax, rsi
        ret