1 /* { dg-do compile } */ 2 /* { dg-options "-O1 -foptimize-sibling-calls -fdump-tree-tailr1-details" } */ 3 int t(int a)4t(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