llvm-gcc-4.2/gcc/testsuite/gcc.target/i386/20011009-1.c

/* { dg-do run { target i?86-*-* x86_64-*-* } } */
/* { dg-options "-O2" } */

extern void abort (void);
extern void exit (int);

int main ()
{
  int x;

  asm ("movl $26, %0 # 26 |-> reg \n\t"
       "movl $28, %0" : "=r" (x));
  if (x != 28)
    abort ();
  exit (0);
}