--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr84436-4.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,38 @@
+/* PR tree-optimization/84436 */
+/* { dg-options "-O2 -fdump-tree-switchconv -fdump-tree-optimized" } */
+/* { dg-do run } */
+
+enum E
+{
+  A, B, C,
+};
+
+int
+__attribute__ ((noipa))
+foo(enum E e)
+{
+  switch (e)
+    {
+    case A: return 0;
+    case B: return 1;
+    case C: return 2;
+    }
+
+  return -1;
+}
+
+int main()
+{
+  if (foo (A) != 0)
+  __builtin_abort ();
+
+  if (foo (B) != 1)
+  __builtin_abort ();
+
+  if (foo (C) != 2)
+  __builtin_abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-not "switch" "optimized" } } */