--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/asan/pr70712.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,32 @@
+/* PR sanitizer/70712 */
+/* { dg-do run } */
+
+struct __attribute__((aligned (64))) S
+{
+  char s[4];
+};
+
+struct T
+{
+  char t[8];
+  char u[480];
+
+};
+
+__attribute__((noinline, noclone)) void
+foo (struct T *p, struct S *q)
+{
+  __builtin_memset (p->t, '\0', sizeof (p->t));
+  __builtin_memset (p->u, '\0', sizeof (p->u));
+  __builtin_memset (q->s, '\0', sizeof (q->s));
+}
+
+int
+main ()
+{
+  struct S s;
+  struct T t;
+  foo (&t, &s);
+  asm volatile ("" : : "r" (&t), "r" (&s) : "memory");
+  return 0;
+}