--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes.test/src/org/graalvm/compiler/nodes/test/ObjectStampMeetTest.java	2016-12-09 00:54:47.930357625 -0800
@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2013, 2016, 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.
+ */
+package org.graalvm.compiler.nodes.test;
+
+import jdk.vm.ci.meta.JavaKind;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import org.graalvm.compiler.core.common.type.ObjectStamp;
+import org.graalvm.compiler.core.common.type.Stamp;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.core.common.type.TypeReference;
+
+public class ObjectStampMeetTest extends AbstractObjectStampTest {
+
+    @Test
+    public void testMeet0() {
+        check(A.class, B.class, A.class);
+    }
+
+    @Test
+    public void testMeet1() {
+        Stamp a = StampFactory.object(getType(A.class));
+        Stamp aNonNull = StampFactory.objectNonNull(getType(A.class));
+        Stamp b = StampFactory.object(getType(B.class));
+        Stamp bNonNull = StampFactory.objectNonNull(getType(B.class));
+        Assert.assertEquals(a, meet(aNonNull, b));
+        Assert.assertEquals(aNonNull, meet(aNonNull, bNonNull));
+    }
+
+    @Test
+    public void testMeet2() {
+        Stamp a = StampFactory.object(getType(A.class));
+        Stamp aExact = StampFactory.objectNonNull(getType(A.class).asExactReference());
+        Stamp b = StampFactory.object(getType(B.class));
+        Assert.assertEquals(a, meet(aExact, b));
+    }
+
+    @Test
+    public void testMeet3() {
+        check(C.class, D.class, A.class);
+    }
+
+    @Test
+    public void testMeet4() {
+        Stamp dExactNonNull = StampFactory.objectNonNull(getType(D.class).asExactReference());
+        Stamp cExactNonNull = StampFactory.objectNonNull(getType(C.class).asExactReference());
+        Stamp aNonNull = StampFactory.objectNonNull(getType(A.class));
+        Assert.assertEquals(aNonNull, meet(cExactNonNull, dExactNonNull));
+    }
+
+    @Test
+    public void testMeet5() {
+        Stamp dExact = StampFactory.object(getType(D.class).asExactReference());
+        Stamp c = StampFactory.object(getType(C.class));
+        Stamp a = StampFactory.object(getType(A.class));
+        Assert.assertEquals(a, meet(dExact, c));
+    }
+
+    @Test
+    public void testMeet6() {
+        Stamp dExactNonNull = StampFactory.objectNonNull(getType(D.class).asExactReference());
+        Stamp alwaysNull = StampFactory.alwaysNull();
+        Stamp dExact = StampFactory.object(getType(D.class).asExactReference());
+        Assert.assertEquals(dExact, meet(dExactNonNull, alwaysNull));
+    }
+
+    @Test
+    public void testMeet7() {
+        Stamp aExact = StampFactory.object(getType(A.class).asExactReference());
+        Stamp e = StampFactory.object(getType(E.class));
+        Stamp a = StampFactory.object(getType(A.class));
+        Assert.assertEquals(a, meet(aExact, e));
+    }
+
+    @Test
+    public void testMeet8() {
+        check(A.class, A.class, A.class);
+    }
+
+    @Test
+    public void testMeet9() {
+        Stamp base1 = StampFactory.object(getType(Base1.class));
+        Stamp ord1 = StampFactory.object(getType(ImplOrder1.class));
+        Stamp ord2 = StampFactory.object(getType(ImplOrder2.class));
+        Assert.assertEquals(base1, meet(ord1, ord2));
+    }
+
+    @Test
+    public void testMeet10() {
+        Stamp base1 = StampFactory.object(getType(Object.class));
+        Stamp ord1 = StampFactory.object(getType(Deep1.class));
+        Stamp ord2 = StampFactory.object(getType(Deep2.class));
+        Assert.assertEquals(base1, meet(ord1, ord2));
+    }
+
+    @Test
+    public void testMeetInterface0() {
+        check(C.class, I.class, I.class);
+    }
+
+    @Test
+    public void testMeetInterface1() {
+        check(I.class, SubI1.class, I.class);
+    }
+
+    @Test
+    public void testMeetInterface2() {
+        check(SubI1.class, SubI2.class, I.class);
+    }
+
+    @Test
+    public void testMeetInterface3() {
+        check(SubI4.class, SubI5.class, SubI3.class);
+    }
+
+    @Test
+    public void testMeetInterface4() {
+        check(SubI4.class, SubI6.class, Object.class);
+    }
+
+    private void check(Class<?> a, Class<?> b, Class<?> result) {
+        Stamp aStamp = StampFactory.object(getType(a));
+        Stamp bStamp = StampFactory.object(getType(b));
+        ObjectStamp resultStamp = StampFactory.object(getType(result));
+        Assert.assertEquals(resultStamp, meet(aStamp, bStamp));
+    }
+
+    @Test
+    public void testMeetIllegal1() {
+        for (Class<?> clazz : new Class<?>[]{A.class, B.class, C.class, D.class, E.class, I.class, Object.class}) {
+            TypeReference type = getType(clazz);
+            for (Stamp test : new Stamp[]{StampFactory.object(type), StampFactory.objectNonNull(type), StampFactory.object(type.asExactReference()),
+                            StampFactory.objectNonNull(type.asExactReference())}) {
+                if (type.getType().isConcrete() || !((ObjectStamp) test).isExactType()) {
+                    Assert.assertEquals("meeting empty and " + test, test, meet(StampFactory.empty(JavaKind.Object), test));
+                }
+            }
+        }
+    }
+}