--- /dev/null
+/* PR libmudflap/36397 */
+/* { dg-do run } */
+/* { dg-options "-O -fmudflap -fno-strict-aliasing -lmudflap" } */
+
+struct A
+{
+ int a[2];
+};
+
+long long int x;
+
+int __attribute__ ((noinline))
+baz (long long int *x)
+{
+ return *x;
+}
+
+int __attribute__ ((noinline))
+foo (int i)
+{
+ if (i > 10)
+ return baz (&x);
+ return ((struct A *) &x)->a[i];
+}
+
+int
+main (void)
+{
+ if (sizeof (long long) == 2 * sizeof (int)
+ && sizeof (long long) == sizeof (struct A))
+ {
+ struct A a = { .a[0] = 10, .a[1] = 20 };
+ __builtin_memcpy (&x, &a, sizeof (x));
+ if (foo (0) != 10 || foo (1) != 20)
+ __builtin_abort ();
+ }
+ return 0;
+}