--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/strlenopt-38.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,49 @@
+/* PR tree-optimization/83444 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+/* { dg-final { scan-tree-dump-not "abort \\(\\)" "optimized" } } */
+
+#include "strlenopt.h"
+
+void
+foo (void)
+{
+  char a[5] = "012";
+  strcpy (a, "");
+  if (strlen (a) != 0)
+    abort ();
+}
+
+void
+bar (void)
+{
+  char a[5] = "012";
+  char b[7] = "";
+  strcpy (a, b);
+  if (strlen (a) != 0)
+    abort ();
+}
+
+struct S { char a[4]; char b[5]; char c[7]; };
+
+void
+baz (void)
+{
+  struct S s;
+  strcpy (s.b, "012");
+  strcpy (s.c, "");
+  strcpy (s.b, s.c);
+  if (s.b[0] != 0)
+    abort ();
+}
+
+void
+boo (void)
+{
+  struct S s;
+  strcpy (s.b, "012");
+  strcpy (s.c, "");
+  strcpy (s.b, s.c);
+  if (strlen (s.b) != 0)
+    abort ();
+}