--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/StraighteningTest.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,96 @@
+/*
+ * 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.graalvm.compiler.debug.DebugContext;
+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;
+import org.junit.Test;
+
+public class StraighteningTest extends GraalCompilerTest {
+
+    private static final String REFERENCE_SNIPPET = "ref";
+
+    public static boolean ref(int a, int b) {
+        return a == b;
+    }
+
+    public static boolean test1Snippet(int a, int b) {
+        int c = a;
+        if (c == b) {
+            c = 0x55;
+        }
+        if (c != 0x55) {
+            return false;
+        }
+        return true;
+    }
+
+    public static boolean test3Snippet(int a, int b) {
+        int val = (int) System.currentTimeMillis();
+        int c = val + 1;
+        if (a == b) {
+            c = val;
+        }
+        if (c != val) {
+            return false;
+        }
+        return true;
+    }
+
+    public static boolean test2Snippet(int a, int b) {
+        int c;
+        if (a == b) {
+            c = 1;
+        } else {
+            c = 0;
+        }
+        return c == 1;
+    }
+
+    @Test(expected = AssertionError.class)
+    public void test1() {
+        test("test1Snippet");
+    }
+
+    public void test2() {
+        test("test2Snippet");
+    }
+
+    @Test(expected = AssertionError.class)
+    public void test3() {
+        test("test3Snippet");
+    }
+
+    private void test(final String snippet) {
+        // No debug scope to reduce console noise for @Test(expected = ...) tests
+        StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES);
+        DebugContext debug = graph.getDebug();
+        debug.dump(DebugContext.BASIC_LEVEL, graph, "Graph");
+        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
+        StructuredGraph referenceGraph = parseEager(REFERENCE_SNIPPET, AllowAssumptions.YES);
+        assertEquals(referenceGraph, graph);
+    }
+}