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/* { dg-do run } */
/* { dg-options "-O1 -foptimize-sibling-calls -fdump-tree-optimized" } */
 
extern void abort (void);
extern void exit (int);
 
int sum (int n)
{
  if (n == 0)
    return 0;
 
  return n + sum (n - 1);
}
 
int fac (int n)
{
  if (n == 0)
    return 1;
 
  return n * fac (n - 1);
}
 
int sq_sum (int n)
{
  if (n == 0)
    return 0;
 
  return n * n + sq_sum (n - 1);
}
 
int pow2m1 (int n)
{
  if (n == 0)
    return 0;
 
  return 2 * pow2m1 (n - 1) + 1;
}
 
int fib (int n)
{
  if (n <= 1)
    return 1;
 
  return fib (n - 2) + fib (n - 1);
}
 
int main(void)
{
  if (sum (5) != 15)
    abort ();
 
  if (fac (5) != 120)
    abort ();
 
  if (sq_sum (5) != 55)
    abort ();
 
  if (pow2m1 (5) != 31)
    abort ();
 
  if (fib (5) != 8)
    abort ();
 
  exit (0);
}
 
/* There is one call of sum in main and then 2 instances of the word in
   ;; Function sum (sum) and one in the function header.  */
/* { dg-final { scan-tree-dump-times "\\msum\\M" 4 "optimized"} } */
/* { dg-final { scan-tree-dump-times "\\mfac\\M" 4 "optimized"} } */
/* { dg-final { scan-tree-dump-times "\\msq_sum\\M" 4 "optimized"} } */
/* { dg-final { scan-tree-dump-times "\\mpow2m1\\M" 4 "optimized"} } */
 
/* There is one recursive call to fib.  */
/* { dg-final { scan-tree-dump-times "\\mfib\\M" 5 "optimized"} } */
 
/* { dg-final { cleanup-tree-dump "optimized" } } */