--- /dev/null	2017-01-22 10:16:57.869617664 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ConditionalEliminationTest5.java	2017-02-15 16:57:28.404648038 -0800
@@ -0,0 +1,153 @@
+/*
+ * Copyright (c) 2015, 2015, 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.core.test;
+
+import org.junit.Test;
+
+import org.graalvm.compiler.api.directives.GraalDirectives;
+
+/**
+ * Collection of tests for
+ * {@link org.graalvm.compiler.phases.common.DominatorConditionalEliminationPhase} including those
+ * that triggered bugs in this phase.
+ */
+public class ConditionalEliminationTest5 extends ConditionalEliminationTestBase {
+
+    interface A {
+    }
+
+    interface B extends A {
+    }
+
+    static final class DistinctA {
+    }
+
+    static final class DistinctB {
+    }
+
+    public static int reference1Snippet(Object a) {
+        if (a instanceof B) {
+            return 1;
+        }
+        return 2;
+    }
+
+    public static int test1Snippet(Object a) {
+        if (a instanceof B) {
+            if (a instanceof A) {
+                return 1;
+            }
+        }
+        return 2;
+    }
+
+    @Test
+    public void test1() {
+        testConditionalElimination("test1Snippet", "reference1Snippet");
+    }
+
+    public static int reference2Snippet(A a) {
+        if (a instanceof B) {
+            return 1;
+        }
+        return 2;
+    }
+
+    public static int test2Snippet(A a) {
+        if (a instanceof B) {
+            B newVal = (B) a;
+            if (newVal != null) {
+                return 1;
+            }
+        }
+        return 2;
+    }
+
+    @Test
+    public void test2() {
+        testConditionalElimination("test2Snippet", "reference2Snippet");
+    }
+
+    @SuppressWarnings("unused")
+    public static int reference3Snippet(Object a, Object b) {
+        if (a instanceof DistinctA) {
+            DistinctA proxyA = (DistinctA) a;
+            if (b instanceof DistinctB) {
+                return 1;
+            }
+        }
+        return 2;
+    }
+
+    @SuppressWarnings("all")
+    public static int test3Snippet(Object a, Object b) {
+        if (a instanceof DistinctA) {
+            DistinctA proxyA = (DistinctA) a;
+            if (b instanceof DistinctB) {
+                if (proxyA == b) {
+                    return 42;
+                }
+                return 1;
+            }
+        }
+        return 2;
+    }
+
+    @Test
+    public void test3() {
+        testConditionalElimination("test3Snippet", "reference3Snippet", true);
+    }
+
+    public static int reference4Snippet(Object a) {
+        if (!(a instanceof B)) {
+            GraalDirectives.deoptimize();
+        }
+        return 1;
+    }
+
+    public static int test4Snippet1(Object a) {
+        if (!(a instanceof B)) {
+            GraalDirectives.deoptimize();
+        }
+        if (!(a instanceof A)) {
+            GraalDirectives.deoptimize();
+        }
+        return 1;
+    }
+
+    public static int test4Snippet2(Object a) {
+        if (!(a instanceof A)) {
+            GraalDirectives.deoptimize();
+        }
+        if (!(a instanceof B)) {
+            GraalDirectives.deoptimize();
+        }
+        return 1;
+    }
+
+    @Test
+    public void test4() {
+        testConditionalElimination("test4Snippet1", "reference4Snippet");
+        testConditionalElimination("test4Snippet2", "reference4Snippet");
+    }
+}