--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/compiler/runtime/Test6778657.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2008, 2009, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 6778657
+ * @summary Casts in SharedRuntime::f2i, f2l, d2i and d2l rely on undefined C++ behaviour
+ *
+ * @run main compiler.runtime.Test6778657
+ */
+
+package compiler.runtime;
+
+public class Test6778657 {
+    public static void check_f2i(int expect) {
+        float check = expect;
+        check *= 2;
+        int actual = (int) check;
+        if (actual != expect) {
+            throw new RuntimeException("expecting " + expect + ", got " + actual);
+        }
+    }
+
+    public static void check_f2l(long expect) {
+        float check = expect;
+        check *= 2;
+        long actual = (long) check;
+        if (actual != expect) {
+            throw new RuntimeException("expecting " + expect + ", got " + actual);
+        }
+    }
+
+    public static void check_d2i(int expect) {
+        double check = expect;
+        check *= 2;
+        int actual = (int) check;
+        if (actual != expect) {
+            throw new RuntimeException("expecting " + expect + ", got " + actual);
+        }
+    }
+
+    public static void check_d2l(long expect) {
+        double check = expect;
+        check *= 2;
+        long actual = (long) check;
+        if (actual != expect) {
+            throw new RuntimeException("expecting " + expect + ", got " + actual);
+        }
+    }
+
+    public static void main(String[] args) {
+        check_f2i(Integer.MAX_VALUE);
+        check_f2i(Integer.MIN_VALUE);
+        check_f2l(Long.MAX_VALUE);
+        check_f2l(Long.MIN_VALUE);
+        check_d2i(Integer.MAX_VALUE);
+        check_d2i(Integer.MIN_VALUE);
+        check_d2l(Long.MAX_VALUE);
+        check_d2l(Long.MIN_VALUE);
+    }
+}
+