--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr80170.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,43 @@
+/* { dg-do run } */
+/* { dg-options "-fgimple -O2 -ftree-slp-vectorize" } */
+/* { dg-require-effective-target ptr32plus } */
+
+struct  A
+{
+  void * a;
+  void * b;
+};
+
+struct __attribute__((aligned(16))) B
+{
+  void * pad;
+  void * misaligned;
+  void * pad2;
+
+  struct A a;
+};
+
+__attribute__((noclone, noinline))
+void __GIMPLE (startwith("slp"))
+NullB (void * misalignedPtr)
+{
+  struct B * b;
+
+  bb_2:
+#if __SIZEOF_LONG__ == 8
+  b_2 = misalignedPtr_1(D) + 18446744073709551608ul;
+#else
+  b_2 = misalignedPtr_1(D) + 4294967292ul;
+#endif
+  __MEM <struct B> (b_2).a.a = _Literal (void *) 0;
+  __MEM <struct B> (b_2).a.b = _Literal (void *) 0;
+  return;
+
+}
+
+int main()
+{
+  struct B b;
+  NullB (&b.misaligned);
+  return 0;
+}