1 /* { dg-do compile } */ 2 /* { dg-options "-O1 -foptimize-sibling-calls -fdump-tree-tailr1-details" } */ 3 int foo(int a)4foo (int a) 5 { 6 if (a) 7 return a * (2 * (foo (a - 1))) + a + 1; 8 else 9 return 0; 10 } 11 /* { dg-final { scan-tree-dump-times "Eliminated tail recursion" 1 "tailr1"} } */ 12