--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.c-torture/execute/pr91597.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,48 @@
+/* PR tree-optimization/91597 */
+
+enum E { A, B, C };
+struct __attribute__((aligned (4))) S { enum E e; };
+
+enum E
+foo (struct S *o)
+{
+  if (((__UINTPTR_TYPE__) (o) & 1) == 0)
+    return o->e;
+  else
+    return A;
+}
+
+int
+bar (struct S *o)
+{
+  return foo (o) == B || foo (o) == C;
+}
+
+static inline void
+baz (struct S *o, int d)
+{
+  if (__builtin_expect (!bar (o), 0))
+    __builtin_abort ();
+  if (d > 2) return;
+  baz (o, d + 1);
+}
+
+void
+qux (struct S *o)
+{
+  switch (o->e)
+    {
+    case A: return;
+    case B: baz (o, 0); break;
+    case C: baz (o, 0); break;
+    }
+}
+
+struct S s = { C };
+
+int
+main ()
+{
+  qux (&s);
+  return 0;
+}