--- /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/LoopUnswitchTest.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,143 @@
+/*
+ * 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.debug.DebugDumpScope;
+import org.graalvm.compiler.loop.DefaultLoopPolicies;
+import org.graalvm.compiler.loop.phases.LoopUnswitchingPhase;
+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 LoopUnswitchTest extends GraalCompilerTest {
+
+    public static int referenceSnippet1(int a) {
+        int sum = 0;
+        if (a > 2) {
+            for (int i = 0; i < 1000; i++) {
+                sum += 2;
+            }
+        } else {
+            for (int i = 0; i < 1000; i++) {
+                sum += a;
+            }
+        }
+        return sum;
+    }
+
+    public static int test1Snippet(int a) {
+        int sum = 0;
+        for (int i = 0; i < 1000; i++) {
+            if (a > 2) {
+                sum += 2;
+            } else {
+                sum += a;
+            }
+        }
+        return sum;
+    }
+
+    public static int referenceSnippet2(int a) {
+        int sum = 0;
+        switch (a) {
+            case 0:
+                for (int i = 0; i < 1000; i++) {
+                    sum += System.currentTimeMillis();
+                }
+                break;
+            case 1:
+                for (int i = 0; i < 1000; i++) {
+                    sum += 1;
+                    sum += 5;
+                }
+                break;
+            case 55:
+                for (int i = 0; i < 1000; i++) {
+                    sum += 5;
+                }
+                break;
+            default:
+                for (int i = 0; i < 1000; i++) {
+                    // nothing
+                }
+                break;
+        }
+        return sum;
+    }
+
+    @SuppressWarnings("fallthrough")
+    public static int test2Snippet(int a) {
+        int sum = 0;
+        for (int i = 0; i < 1000; i++) {
+            switch (a) {
+                case 0:
+                    sum += System.currentTimeMillis();
+                    break;
+                case 1:
+                    sum += 1;
+                    // fall through
+                case 55:
+                    sum += 5;
+                    break;
+                default:
+                    // nothing
+                    break;
+            }
+        }
+        return sum;
+    }
+
+    @Test
+    public void test1() {
+        test("test1Snippet", "referenceSnippet1");
+    }
+
+    @Test
+    public void test2() {
+        test("test2Snippet", "referenceSnippet2");
+    }
+
+    @SuppressWarnings("try")
+    private void test(String snippet, String referenceSnippet) {
+        DebugContext debug = getDebugContext();
+        final StructuredGraph graph = parseEager(snippet, AllowAssumptions.NO);
+        final StructuredGraph referenceGraph = parseEager(referenceSnippet, AllowAssumptions.NO);
+
+        new LoopUnswitchingPhase(new DefaultLoopPolicies()).apply(graph);
+
+        // Framestates create comparison problems
+        graph.clearAllStateAfter();
+        referenceGraph.clearAllStateAfter();
+
+        new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
+        new CanonicalizerPhase().apply(referenceGraph, new PhaseContext(getProviders()));
+        try (DebugContext.Scope s = debug.scope("Test", new DebugDumpScope("Test:" + snippet))) {
+            assertEquals(referenceGraph, graph);
+        } catch (Throwable e) {
+            throw debug.handle(e);
+        }
+    }
+}