--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/Wduplicated-branches-11.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,75 @@
+/* PR c/64279 */
+/* { dg-do compile } */
+/* { dg-options "-Wduplicated-branches" } */
+
+int
+f (int p)
+{
+  if (p == 0)
+    {
+      p += 1, ++p;
+    }
+  else
+    {
+      p -= 1, ++p;
+    }
+
+  if (p == 1)
+    {
+    }
+  else
+    p++;
+
+  if (p == 2)
+    p++;
+  else
+    {
+    }
+
+  if (p == 3)
+    {
+    }
+  else
+    {
+    }
+
+  if (p == 4)
+    {
+      ++p;
+      return p;
+    }
+  else
+    {
+      p++;
+      return p;
+    }
+
+  if (p == 5)
+    ++p;
+  else
+    p++;
+
+  if (p == 6)
+    {
+      ++p;
+      ++p;
+      return p;
+    }
+  else
+    {
+      ++p;
+      return p;
+    }
+
+  if (p == 7)
+    {
+      ++p;
+      return p;
+    }
+  else
+    {
+      ++p;
+      ++p;
+      return p;
+    }
+}