integer res
#ilASM{ jmp @f
      ::add
    [32]
        mov eax,[esp+4]
        add eax,[esp+8]
    [64]
        mov rax,[rsp+8]
        add rax,[rsp+16]
    []
        ret
      @@:
        push 12
        push 7
        call :add
    [32]
        add esp,8
        mov [res],eax
    [64]
        add rsp,16
        mov [res],rax
    []
      }
?res