1  /* { dg-do compile } */
       2  /* { dg-options "-O2" } */
       3  /* { dg-final { scan-assembler-not "ldwio" } } */
       4  /* { dg-final { scan-assembler-not "stwio" } } */
       5  
       6  /* Make sure the default behavior is not to generate I/O variants of
       7     the load and stores to foo.  */
       8  
       9  extern volatile int foo;
      10  
      11  int
      12  read_foo (void)
      13  {
      14    return foo;
      15  }
      16  
      17  void
      18  write_foo (int x)
      19  {
      20    foo = x;
      21  }