1  /* { dg-do compile } */
       2  /* { dg-skip-if "" { ! { i?86-*-* x86_64-*-* } } } */
       3  /* { dg-options "-O2 -fdump-tree-optimized" } */
       4  
       5  struct thread_info { int preempt_count; };
       6  static inline struct thread_info *current_thread_info(void)
       7  {
       8    register struct thread_info *sp asm("esp");
       9    return sp;
      10  }
      11  void testcase(void)
      12  {
      13    current_thread_info()->preempt_count += 1;
      14  }
      15  
      16  /* We have to make sure that alias analysis treats sp as pointing
      17     to globals and thus the store not optimized away.  */
      18  
      19  /* { dg-final { scan-tree-dump "->preempt_count =" "optimized" } } */