Can you optimize my fibs?

Hi /frog/,

I've been tweaking my fibs implementation and it still seems slow in some cases.

How could I make it faster? Any ideas? Any obvious optimilizations I'm missing here?

fibs:
cmp rdi, 1
ja .l1
mov rax, rdi
ret
.l1:
dec rdi
push rdi
call fibs
pop rdi
push rax
dec rdi
call fibs
pop rcx
add rax, rcx
ret

>>23
I KNOW, FUNROLL ALL THE THINGS

>>24
I'm the same C-supremacist from that thread. Unfortunately he didnt implement semantically exact C equivalent, no side by side comparison, no scientific method. Wishful thinking, as expected from anime degenerates.