--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr38245-2.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,109 @@
+/* PR rtl-optimization/38245 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-optimized" } */
+
+extern void link_error (void);
+
+void
+f1 (unsigned int a)
+{
+  if (a != 28)
+    {
+      if (4 / a == 5)
+	link_error ();
+    }
+}
+
+void
+f2 (unsigned int a)
+{
+  if (4 / a == 5)
+    link_error ();
+}
+
+void
+f3 (unsigned int a)
+{
+  if (4 / (a & 0xff) == 5)
+    link_error ();
+}
+
+void
+f4 (unsigned int a, unsigned int b)
+{
+  if ((b & 3) / ((a & 0xff) + 1) == 5)
+    link_error ();
+}
+
+void
+f5 (int a)
+{
+  if (a != 28)
+    {
+      if (4 / a == 5)
+	link_error ();
+    }
+}
+
+void
+f6 (int a)
+{
+  if (4 / a == 5)
+    link_error ();
+}
+
+void
+f7 (int a)
+{
+  if (4 / (a & 0xff) == 5)
+    link_error ();
+}
+
+void
+f8 (int a, int b)
+{
+  if ((b & 3) / ((a & 0xff) + 1) == 5)
+    link_error ();
+}
+
+void
+f9 (int a, int b)
+{
+  if (b >= 4)
+    if ((a / b) == __INT_MAX__ / 2)
+      link_error ();
+}
+
+void
+f10 (unsigned int a, unsigned int b)
+{
+  if (b >= 16)
+    if ((a / b) == __INT_MAX__ / 4)
+      link_error ();
+}
+
+void
+f11 (int a, int b)
+{
+  if (b <= -32)
+    if ((a / b) == -__INT_MAX__ / 16)
+      link_error ();
+}
+
+void
+f12 (int a, int b)
+{
+  if (a >= -6 && a <= 4)
+    if ((a / b) == -7 || (a / b) == 7)
+      link_error ();
+}
+
+void
+f13 (unsigned int a, unsigned int b)
+{
+  if (a <= 4)
+    if ((a / b) == 5)
+      link_error ();
+}
+
+/* { dg-final { scan-tree-dump-not "link_error" "optimized" } } */