gcc/testsuite/gcc.dg/tree-ssa/tailrecursion-4.c

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