1 files changed, 38 insertions, 0 deletions
diff --git a/libmudflap/testsuite/libmudflap.c/pass64-frag.c b/libmudflap/testsuite/libmudflap.c/pass64-frag.c
new file mode 100644
index 000000000..856eec0fa
--- /dev/null
+++ b/libmudflap/testsuite/libmudflap.c/pass64-frag.c
@@ -0,0 +1,38 @@
+/* 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;
+}