--- /dev/null	2009-07-06 20:02:10.000000000 -0700
+++ new/test/java/lang/Long/Unsigned.java	2010-01-21 16:57:29.000000000 -0800
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/**
+ * @test
+ * @bug 4504839
+ * @summary Basic tests for unsigned operations
+ * @author Joseph D. Darcy
+ */
+
+import java.math.*;
+
+public class Unsigned {
+    public static void main(String... args) {
+        int errors = 0;
+
+        errors += testUnsignedCompare();
+
+        if (errors > 0) {
+            throw new RuntimeException(errors + "errors found in unsigned operations.");
+        }
+    }
+
+    private static int testUnsignedCompare() {
+        int errors = 0;
+        
+        long[] data = {
+            0L,
+            1L,
+            2L,
+            3L,
+            0x00000000_80000000L,
+            0x00000000_FFFFFFFFL,
+            0x00000001_00000000L,
+            0x80000000_00000000L,
+            0x80000000_00000001L,
+            0x80000000_00000002L,
+            0x80000000_00000003L,
+            0x80000000_80000000L,
+            0xFFFFFFFF_FFFFFFFEL,
+            0xFFFFFFFF_FFFFFFFFL,
+        };
+
+        for(long i : data) {
+            for(long j : data) {
+                long libraryResult    = Long.compareUnsigned(i, j);
+                long libraryResultRev = Long.compareUnsigned(j, i);
+                long localResult      = compUnsigned(i, j);
+                
+                if (i == j) {
+                    if (libraryResult != 0) {
+                        errors++;
+                        System.err.printf("Value 0x%x did not compare as " +
+                                          "an unsigned equal to itself; got %d%n",
+                                          i, libraryResult);
+                    }
+                }
+
+                   if (Long.signum(libraryResult) != Long.signum(localResult)) {
+                       errors++;
+                       System.err.printf("Unsigned compare of 0x%x to 0x%x%n:" +
+                                         "\texpected sign of %d, got %d%n",
+                                         i, j, localResult, libraryResult);
+                   }
+
+                if (Long.signum(libraryResult) !=
+                    -Long.signum(libraryResultRev)) {
+                    errors++;
+                    System.err.printf("unsgnCmp(x, y) != - unsignedComp(y,x) for" +
+                                      "\t0x%x and 0x%x, computed %d and %d%n",
+                                      i, j, libraryResult, libraryResultRev);
+                }
+            }
+        }
+
+        return errors;
+    }
+
+    private static int compUnsigned(long x, long y) {
+        BigInteger big_x = toUnsignedBigInt(x);
+        BigInteger big_y = toUnsignedBigInt(y);
+
+        return big_x.compareTo(big_y);
+    }
+
+    private static BigInteger toUnsignedBigInt(long x) {
+        if (x >= 0)
+            return BigInteger.valueOf(x);
+        else {
+            int upper = (int)(((long)x) >> 32);
+            int lower = (int) x;
+
+            BigInteger bi = // (upper << 32) + lower
+                (BigInteger.valueOf(Integer.toUnsignedLong(upper))).shiftLeft(32).
+                add(BigInteger.valueOf(Integer.toUnsignedLong(lower)));
+
+            System.out.printf("%n\t%d%n\t%s%n", x, bi.toString());
+            return bi; // TODO
+        }
+    }
+}