.lcomm num1 2
.lcomm num2 2
.global _start
.text
_start:
      movw  $46,%ax
      pushw %ax
      pushw %ax
      call  sub1
      popw  %ax
      popw  %ax
      nop
      movl  $1,%eax
      movl  $0,%ebx
      int   $0x80

sub1:
      movw  4(%esp),%ax
      addw  6(%esp),%ax
      ret