--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.c-torture/execute/pr86844.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,24 @@
+/* PR tree-optimization/86844 */
+
+__attribute__((noipa)) void
+foo (int *p)
+{
+  *p = 0;
+  *((char *)p + 3) = 1;
+  *((char *)p + 1) = 2;
+  *((char *)p + 2) = *((char *)p + 6);
+}
+
+int
+main ()
+{
+  int a[2] = { -1, 0 };
+  if (sizeof (int) != 4)
+    return 0;
+  ((char *)a)[6] = 3;
+  foo (a);
+  if (((char *)a)[0] != 0 || ((char *)a)[1] != 2
+      || ((char *)a)[2] != 3 || ((char *)a)[3] != 1)
+    __builtin_abort ();
+  return 0;
+}