1  /* { dg-do assemble } */
       2  /* { dg-options "-O2 -masm=intel" } */
       3  /* { dg-require-effective-target lp64 } */
       4  /* { dg-require-effective-target masm_intel } */
       5  
       6  void
       7  foo (void)
       8  {
       9    *(volatile long*)0xFFFF800000000000 = -1;
      10  }