1  /* { dg-do run } */
       2  /* { dg-options "-O2" } */
       3  
       4  extern void abort (void);
       5  extern void exit (int);
       6  
       7  static inline __attribute__((always_inline))
       8  void
       9  prefetch (void *x)
      10  {
      11    asm volatile("prefetcht0 %0" : : "m" (*(unsigned long *)x));
      12  }
      13  
      14  struct hlist_head
      15  {
      16    struct hlist_node *first;
      17  };
      18  
      19  struct hlist_node
      20  {
      21    struct hlist_node *next;
      22    unsigned long i_ino;
      23  };
      24  
      25  struct hlist_node * find_inode_fast(struct hlist_head *head, unsigned long ino)
      26  {
      27    struct hlist_node *node;
      28  
      29    for (node = head->first;
      30         node && (prefetch (node->next), 1);
      31         node = node->next)
      32      {
      33        if (node->i_ino == ino)
      34  	break;
      35      }
      36    return node ? node : 0;
      37  }
      38  
      39  struct hlist_node g2;
      40  struct hlist_node g1 = { &g2 };
      41  struct hlist_head h = { &g1 };
      42  
      43  int
      44  main()
      45  {
      46    if (find_inode_fast (&h, 1) != 0)
      47      abort ();
      48    exit (0);
      49  }