1 /* Simple check that sibling calls are performed from a
2    void non-leaf-function taking one int argument calling itself.
3 
4    Copyright (C) 2002 Free Software Foundation Inc.
5    Contributed by Hans-Peter Nilsson  <hp@bitrange.com>  */
6 
7 /* { dg-do run } */
8 /* { dg-options "-O2 -foptimize-sibling-calls" } */
9 
10 /* The option -foptimize-sibling-calls is the default, but serves as
11    marker.  Self-recursion tail calls are optimized for all targets,
12    regardless of presence of sibcall patterns.  */
13 
14 extern void abort (void);
15 extern void exit (int);
16 
17 extern void recurser_void (int);
18 extern void track (int);
19 
main()20 int main ()
21 {
22   recurser_void (0);
23   exit (0);
24 }
25 
26 void
recurser_void(int n)27 recurser_void (int n)
28 {
29   if (n == 0 || n == 7)
30     track (n);
31 
32   if (n == 10)
33     return;
34 
35   recurser_void (n + 1);
36 }
37 
38 void *trackpoint;
39 
40 void __attribute__ ((noinline))
track(int n)41 track (int n)
42 {
43   char stackpos[1];
44 
45   if (n == 0)
46     trackpoint = stackpos;
47   else if (n != 7 || trackpoint != stackpos)
48     abort ();
49 }
50