1 /* { dg-do compile } */
2 /* { dg-options "-O1 -foptimize-sibling-calls -fdump-tree-tailr1-details" } */
3 int
t(int a)4 t(int a)
5 {
6 	int r;
7 	if (a&1)
8 		r = t(a-1);
9 	else if (a)
10 		r = t(a-2);
11 	else
12 		return 0;
13 	if (r)
14 		r=r;
15 	return r;
16 }
17 /* { dg-final { scan-tree-dump-times "Eliminated tail recursion" 2 "tailr1"} } */
18