/* { dg-do compile } */ /* { dg-options "-O1 -foptimize-sibling-calls -fdump-tree-tailr1-details" } */ int t(int a) { int r; if (a) r = t(a-1); else return 0; if (r) r=r; return r; } /* { dg-final { scan-tree-dump-times "Eliminated tail recursion" 1 "tailr1"} } */ /* { dg-final { cleanup-tree-dump "tailr1" } } */