gcc/testsuite/gcc.dg/tree-ssa/tailrecursion-6.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -foptimize-sibling-calls -fdump-tree-tailr1-details" } */
   3 int
   4 foo (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 /* { dg-final { cleanup-tree-dump "tailr1" } } */