text: /* { dg-do run } */
  /* { dg-options "-O1 -foptimize-sibling-calls -fdump-tree-optimized" } */
  
  extern void abort (void);
  extern void exit (int);
  
  int foo (int n)
  {
    return n == 0 ? 1 : n * (n - foo (n - 1));
  }
  
  int bar (int n)
  {
    return n == 0 ? 1 : n * (- bar (n - 1));
  }
  
  int baz (int n, int m)
  {
    return n == 0 ? 100 : (baz (n - 1, m) - m);
  }
  
  int main (void)
  {
    if (foo (6) != 726)
      abort ();
  
    if (bar (7) != -5040)
      abort ();
  
    if (baz (10, 5) != 50)
      abort ();
  
    exit (0);
  }
  
  /* { dg-final { scan-tree-dump-times "\\mfoo\\M" 4 "optimized"} } */
  /* { dg-final { scan-tree-dump-times "\\mbar\\M" 4 "optimized"} } */
  /* { dg-final { scan-tree-dump-times "\\mbaz\\M" 4 "optimized"} } */
  
  