1  /* Simple check that tail recursive call optimization is also
       2     controlled by -foptimize-sibling-calls.
       3  
       4     Copyright (C) 2006 Free Software Foundation Inc.
       5     Original test by Hans-Peter Nilsson  <hp@bitrange.com>  */
       6  
       7  /* On IA64 the call frame is allocated on the register stack, not the
       8     normal stack.  */
       9  
      10  /* { dg-do run { target { ! "ia64-*-*" } } } */
      11  /* { dg-options "-O2 -fno-optimize-sibling-calls" } */
      12  
      13  
      14  extern void abort (void);
      15  
      16  extern void recurser_void (int);
      17  extern void track (int);
      18  
      19  int main (void)
      20  {
      21    recurser_void (0);
      22    return 0;
      23  }
      24  
      25  void recurser_void (int n)
      26  {
      27    if (n == 0 || n == 7)
      28      track (n);
      29  
      30    if (n == 10)
      31      return;
      32  
      33    recurser_void (n + 1);
      34  }
      35  
      36  void *trackpoint;
      37  
      38  void track (int n)
      39  {
      40    char stackpos[1];
      41  
      42    if (n == 0)
      43      trackpoint = stackpos;
      44    else if (n != 7 || trackpoint == stackpos)
      45      abort ();
      46  }