1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -ftree-loop-distribution" } */
       3  #define NULL ((void *)0)
       4  
       5  __extension__ typedef __SIZE_TYPE__ size_t;
       6  extern void *foo(size_t nelem, size_t elsize);
       7  extern void bar (char*, ...);
       8  
       9  typedef struct alt_state *alt_state_t;
      10  typedef struct state *state_t;
      11  
      12  struct alt_state
      13  {
      14    alt_state_t next_alt_state;
      15  };
      16  
      17  static alt_state_t first_free_alt_state = NULL;
      18  
      19  static void
      20  free_alt_state (alt_state_t alt_state)
      21  {
      22    if (alt_state == NULL)
      23      return;
      24    alt_state->next_alt_state = first_free_alt_state;
      25    first_free_alt_state = alt_state;
      26  }
      27  
      28  /* The function frees list started with node ALT_STATE_LIST.  */
      29  static void
      30  free_alt_states (alt_state_t alt_states_list)
      31  {
      32    alt_state_t curr_alt_state;
      33    alt_state_t next_alt_state;
      34  
      35    for (curr_alt_state = alt_states_list;
      36         curr_alt_state != NULL;
      37         curr_alt_state = next_alt_state)
      38      {
      39        next_alt_state = curr_alt_state->next_alt_state;
      40        free_alt_state (curr_alt_state);
      41      }
      42  }
      43  
      44  int 
      45  main (void)
      46  {
      47    int i;
      48    alt_state_t state, act_state;
      49  
      50    act_state = state = foo (1, sizeof (struct alt_state));
      51    for (i = 0; i < 2; i ++)
      52    {
      53      act_state->next_alt_state = foo (1, sizeof (struct alt_state));
      54      act_state = act_state->next_alt_state;
      55    }
      56  
      57    free_alt_states (state);
      58  
      59    for (act_state = first_free_alt_state;
      60         act_state != NULL;
      61         act_state = act_state->next_alt_state)
      62         bar ("going from %p to %p\n", act_state, act_state->next_alt_state);
      63  
      64    return 0;
      65  }