gcc/testsuite/gcc.target/i386/20080723-1.c

   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 }