--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/strlenopt-67.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,52 @@
+/* PR tree-optimization/90989 - incorrrect strlen result after second strcpy
+   into the same destination.
+   { dg-do compile }
+   { dg-options "-O2 -Wall -fdump-tree-optimized" } */
+
+// #include "strlenopt.h"
+
+char a[4];
+
+int f4 (void)
+{
+  char b[4];
+  __builtin_strcpy (b, "12");
+
+  int i = __builtin_strcmp (a, b);
+
+  __builtin_strcpy (b, "123");
+  if (__builtin_strlen (b) != 3)
+    __builtin_abort ();
+
+  return i;
+}
+
+int f6 (void)
+{
+  char b[6];
+  __builtin_strcpy (b, "1234");
+
+  int i = __builtin_strcmp (a, b);
+
+  __builtin_strcpy (b, "12345");
+  if (__builtin_strlen (b) != 5)
+    __builtin_abort ();
+
+  return i;
+}
+
+int f8 (void)
+{
+  char b[8];
+  __builtin_strcpy (b, "1234");
+
+  int i = __builtin_strcmp (a, b);
+
+  __builtin_strcpy (b, "1234567");
+  if (__builtin_strlen (b) != 7)
+    __builtin_abort ();
+
+  return i;
+}
+
+/* { dg-final { scan-tree-dump-times "abort|strlen" 0 "optimized" } } */