20010520-1.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* { dg-do compile { target i?86-*-* } } */
/* { dg-options "-w" } */

void f ()
{
  int i __asm__ ("%eax");
  __asm__ volatile ("" : "=a" (i));
}