--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.c-torture/execute/strlen-2.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,210 @@
+/* PR tree-optimization/86532 - Wrong code due to a wrong strlen folding  */
+
+extern __SIZE_TYPE__ strlen (const char*);
+
+static const char a[2][3] = { "1", "12" };
+static const char b[2][2][5] = { { "1", "12" }, { "123", "1234" } };
+
+volatile int v0 = 0;
+volatile int v1 = 1;
+volatile int v2 = 2;
+
+#define A(expr)								\
+  ((expr) ? (void)0 : (__builtin_printf ("assertion on line %i: %s\n",	\
+					 __LINE__, #expr),		\
+		       __builtin_abort ()))
+
+void test_array_ref_2_3 (void)
+{
+  A (strlen (a[v0]) == 1);
+  A (strlen (&a[v0][v0]) == 1);
+  A (strlen (&a[0][v0]) == 1);
+  A (strlen (&a[v0][0]) == 1);
+
+  A (strlen (a[v1]) == 2);
+  A (strlen (&a[v1][0]) == 2);
+  A (strlen (&a[1][v0]) == 2);
+  A (strlen (&a[v1][v0]) == 2);
+
+  A (strlen (&a[v1][1]) == 1);
+  A (strlen (&a[v1][1]) == 1);
+
+  A (strlen (&a[v1][2]) == 0);
+  A (strlen (&a[v1][v2]) == 0);
+
+  int i0 = 0;
+  int i1 = i0 + 1;
+  int i2 = i1 + 1;
+
+  A (strlen (a[v0]) == 1);
+  A (strlen (&a[v0][v0]) == 1);
+  A (strlen (&a[i0][v0]) == 1);
+  A (strlen (&a[v0][i0]) == 1);
+
+  A (strlen (a[v1]) == 2);
+  A (strlen (&a[v1][i0]) == 2);
+  A (strlen (&a[i1][v0]) == 2);
+  A (strlen (&a[v1][v0]) == 2);
+
+  A (strlen (&a[v1][i1]) == 1);
+  A (strlen (&a[v1][i1]) == 1);
+
+  A (strlen (&a[v1][i2]) == 0);
+  A (strlen (&a[v1][v2]) == 0);
+}
+
+void test_array_off_2_3 (void)
+{
+  A (strlen (a[0] + 0) == 1);
+  A (strlen (a[0] + v0) == 1);
+  A (strlen (a[v0] + 0) == 1);
+  A (strlen (a[v0] + v0) == 1);
+
+  A (strlen (a[v1] + 0) == 2);
+  A (strlen (a[1] + v0) == 2);
+  A (strlen (a[v1] + 0) == 2);
+  A (strlen (a[v1] + v0) == 2);
+
+  A (strlen (a[v1] + 1) == 1);
+  A (strlen (a[v1] + v1) == 1);
+
+  A (strlen (a[v1] + 2) == 0);
+  A (strlen (a[v1] + v2) == 0);
+
+  int i0 = 0;
+  int i1 = i0 + 1;
+  int i2 = i1 + 1;
+
+  A (strlen (a[i0] + i0) == 1);
+  A (strlen (a[i0] + v0) == 1);
+  A (strlen (a[v0] + i0) == 1);
+  A (strlen (a[v0] + v0) == 1);
+
+  A (strlen (a[v1] + i0) == 2);
+  A (strlen (a[i1] + v0) == 2);
+  A (strlen (a[v1] + i0) == 2);
+  A (strlen (a[v1] + v0) == 2);
+
+  A (strlen (a[v1] + i1) == 1);
+  A (strlen (a[v1] + v1) == 1);
+
+  A (strlen (a[v1] + i2) == 0);
+  A (strlen (a[v1] + v2) == 0);
+}
+
+void test_array_ref_2_2_5 (void)
+{
+  A (strlen (b[0][v0]) == 1);
+  A (strlen (b[v0][0]) == 1);
+
+  A (strlen (&b[0][0][v0]) == 1);
+  A (strlen (&b[0][v0][0]) == 1);
+  A (strlen (&b[v0][0][0]) == 1);
+
+  A (strlen (&b[0][v0][v0]) == 1);
+  A (strlen (&b[v0][0][v0]) == 1);
+  A (strlen (&b[v0][v0][0]) == 1);
+
+  A (strlen (b[0][v1]) == 2);
+  A (strlen (b[v1][0]) == 3);
+
+  A (strlen (&b[0][0][v1]) == 0);
+  A (strlen (&b[0][v1][0]) == 2);
+  A (strlen (&b[v0][0][0]) == 1);
+
+  A (strlen (&b[0][v0][v0]) == 1);
+  A (strlen (&b[v0][0][v0]) == 1);
+  A (strlen (&b[v0][v0][0]) == 1);
+
+  A (strlen (&b[0][v1][v1]) == 1);
+  A (strlen (&b[v1][0][v1]) == 2);
+  A (strlen (&b[v1][v1][0]) == 4);
+  A (strlen (&b[v1][v1][1]) == 3);
+  A (strlen (&b[v1][v1][2]) == 2);
+
+  int i0 = 0;
+  int i1 = i0 + 1;
+  int i2 = i1 + 1;
+
+  A (strlen (b[i0][v0]) == 1);
+  A (strlen (b[v0][i0]) == 1);
+
+  A (strlen (&b[i0][i0][v0]) == 1);
+  A (strlen (&b[i0][v0][i0]) == 1);
+  A (strlen (&b[v0][i0][i0]) == 1);
+
+  A (strlen (&b[i0][v0][v0]) == 1);
+  A (strlen (&b[v0][i0][v0]) == 1);
+  A (strlen (&b[v0][v0][i0]) == 1);
+
+  A (strlen (b[i0][v1]) == 2);
+  A (strlen (b[v1][i0]) == 3);
+
+  A (strlen (&b[i0][i0][v1]) == 0);
+  A (strlen (&b[i0][v1][i0]) == 2);
+  A (strlen (&b[v0][i0][i0]) == 1);
+
+  A (strlen (&b[i0][v0][v0]) == 1);
+  A (strlen (&b[v0][i0][v0]) == 1);
+  A (strlen (&b[v0][v0][i0]) == 1);
+
+  A (strlen (&b[i0][v1][v1]) == 1);
+  A (strlen (&b[v1][i0][v1]) == 2);
+  A (strlen (&b[v1][v1][i0]) == 4);
+  A (strlen (&b[v1][v1][i1]) == 3);
+  A (strlen (&b[v1][v1][i2]) == 2);
+}
+
+void test_array_off_2_2_5 (void)
+{
+  A (strlen (b[0][0] + v0) == 1);
+  A (strlen (b[0][v0] + v0) == 1);
+  A (strlen (b[v0][0] + v0) == 1);
+  A (strlen (b[v0][v0] + v0) == 1);
+
+  A (strlen (b[0][0] + v1) == 0);
+  A (strlen (b[0][v1] + 0) == 2);
+  A (strlen (b[v0][0] + 0) == 1);
+
+  A (strlen (b[0][v0] + v0) == 1);
+  A (strlen (b[v0][0] + v0) == 1);
+  A (strlen (b[v0][v0] + 0) == 1);
+
+  A (strlen (b[0][v1] + v1) == 1);
+  A (strlen (b[v1][0] + v1) == 2);
+  A (strlen (b[v1][v1] + 0) == 4);
+  A (strlen (b[v1][v1] + 1) == 3);
+  A (strlen (b[v1][v1] + 2) == 2);
+
+  int i0 = 0;
+  int i1 = i0 + 1;
+  int i2 = i1 + 1;
+
+  A (strlen (b[i0][i0] + v0) == 1);
+  A (strlen (b[i0][v0] + v0) == 1);
+  A (strlen (b[v0][i0] + v0) == 1);
+  A (strlen (b[v0][v0] + v0) == 1);
+
+  A (strlen (b[i0][i0] + v1) == 0);
+  A (strlen (b[i0][v1] + i0) == 2);
+  A (strlen (b[v0][i0] + i0) == 1);
+
+  A (strlen (b[i0][v0] + v0) == 1);
+  A (strlen (b[v0][i0] + v0) == 1);
+  A (strlen (b[v0][v0] + i0) == 1);
+
+  A (strlen (b[i0][v1] + v1) == 1);
+  A (strlen (b[v1][i0] + v1) == 2);
+  A (strlen (b[v1][v1] + i0) == 4);
+  A (strlen (b[v1][v1] + i1) == 3);
+  A (strlen (b[v1][v1] + i2) == 2);
+}
+
+int main ()
+{
+  test_array_ref_2_3 ();
+  test_array_off_2_3 ();
+
+  test_array_ref_2_2_5 ();
+  test_array_off_2_2_5 ();
+}