--- /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/ScalarTypeSystemTest.java	2017-02-15 16:57:46.770446163 -0800
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) 2011, 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.debug.Debug;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+import org.graalvm.compiler.phases.tiers.PhaseContext;
+
+/**
+ * In the following tests, the scalar type system of the compiler should be complete enough to see
+ * the relation between the different conditions.
+ */
+public class ScalarTypeSystemTest extends GraalCompilerTest {
+
+    public static int referenceSnippet1(int a) {
+        if (a > 0) {
+            return 1;
+        } else {
+            return 2;
+        }
+    }
+
+    @Test(expected = AssertionError.class)
+    public void test1() {
+        test("test1Snippet", "referenceSnippet1");
+    }
+
+    public static int test1Snippet(int a) {
+        if (a > 0) {
+            if (a > -1) {
+                return 1;
+            } else {
+                return 3;
+            }
+        } else {
+            return 2;
+        }
+    }
+
+    @Test(expected = AssertionError.class)
+    public void test2() {
+        test("test2Snippet", "referenceSnippet1");
+    }
+
+    public static int test2Snippet(int a) {
+        if (a > 0) {
+            if (a == -15) {
+                return 3;
+            } else {
+                return 1;
+            }
+        } else {
+            return 2;
+        }
+    }
+
+    @Test(expected = AssertionError.class)
+    public void test3() {
+        test("test3Snippet", "referenceSnippet2");
+    }
+
+    public static int referenceSnippet2(int a, int b) {
+        if (a > b) {
+            return 1;
+        } else {
+            return 2;
+        }
+    }
+
+    public static int test3Snippet(int a, int b) {
+        if (a > b) {
+            if (a == b) {
+                return 3;
+            } else {
+                return 1;
+            }
+        } else {
+            return 2;
+        }
+    }
+
+    public static int referenceSnippet3(int a, int b) {
+        if (a == b) {
+            return 1;
+        } else {
+            return 2;
+        }
+    }
+
+    @Test(expected = AssertionError.class)
+    public void test6() {
+        test("test6Snippet", "referenceSnippet3");
+    }
+
+    public static int test6Snippet(int a, int b) {
+        if (a == b) {
+            if (a == b + 1) {
+                return 3;
+            } else {
+                return 1;
+            }
+        } else {
+            return 2;
+        }
+    }
+
+    private void test(final String snippet, final String referenceSnippet) {
+        // No debug scope to reduce console noise for @Test(expected = ...) tests
+        StructuredGraph graph = parseEager(snippet, AllowAssumptions.NO);
+        Debug.dump(Debug.BASIC_LOG_LEVEL, graph, "Graph");
+        PhaseContext context = new PhaseContext(getProviders());
+        new CanonicalizerPhase().apply(graph, context);
+        StructuredGraph referenceGraph = parseEager(referenceSnippet, AllowAssumptions.NO);
+        assertEquals(referenceGraph, graph);
+    }
+}