--- /dev/null	2017-04-05 16:10:48.427197190 -0400
+++ new/test/native/utilities/test_count_trailing_zeros.cpp	2017-04-21 13:24:49.973162728 -0400
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2017, 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "utilities/count_trailing_zeros.hpp"
+#include "utilities/globalDefinitions.hpp"
+#include "unittest.hpp"
+
+TEST(count_trailing_zeros, one_or_two_set_bits) {
+  unsigned i = 0;               // Position of a set bit.
+  for (uintx ix = 1; ix != 0; ix <<= 1, ++i) {
+    unsigned j = 0;             // Position of a set bit.
+    for (uintx jx = 1; jx != 0; jx <<= 1, ++j) {
+      uintx value = ix | jx;
+      EXPECT_EQ(MIN2(i, j), count_trailing_zeros(value))
+        << "value = " << value;
+    }
+  }
+}
+
+TEST(count_trailing_zeros, all_ones_followed_by_all_zeros) {
+  unsigned i = BitsPerWord - 1; // Index of most significant set bit.
+  uintx value = ~(uintx)0;
+  for ( ; value != 0; value >>= 1, --i) {
+    EXPECT_EQ(0u, count_trailing_zeros(value))
+      << "value = " << value;
+  }
+}
+
+TEST(count_trailing_zeros, all_zeros_followed_by_all_ones) {
+  unsigned i = 0;               // Index of least significant set bit.
+  uintx value = ~(uintx)0;
+  for ( ; value != 0; value <<= 1, ++i) {
+    EXPECT_EQ(i, count_trailing_zeros(value))
+      << "value = " << value;
+  }
+}