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_start_return:
;; return the last value in the stack
pop rdi
;; is nil?
mov rax, rdi
cmp rax, NIL_VAL
je exit
;; is boolean?
mov rax, rdi
and rax, BOOL_MASK
cmp rax, BOOL_TAG
jne not_bool
call printbool
jmp exit
not_bool:
;; is fixnum?
mov rax, rdi
and rax, FIXNUM_MASK
cmp rax, FIXNUM_TAG
jne not_fixnum
call printdln
jmp exit
not_fixnum:
exit:
; exit syscall
mov rax, 60
xor rdi, rdi
syscall
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