1 /* 2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.core.test; 24 25 import org.junit.Test; 26 27 import org.graalvm.compiler.nodes.StructuredGraph; 28 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions; 29 import org.graalvm.compiler.phases.common.CanonicalizerPhase; 30 import org.graalvm.compiler.phases.common.DominatorConditionalEliminationPhase; 31 import org.graalvm.compiler.phases.tiers.HighTierContext; 32 33 public class ConditionalEliminationMulTest extends GraalCompilerTest { 34 35 public static void snippet01(int a) { 36 if (a == 2) { 37 if (a * 3 != 6) { 38 shouldBeOptimizedAway(); 39 } 40 } 41 } 42 43 public static void snippet02(int a) { 44 if (a == 0) { 45 if (a * 3 != 0) { 46 shouldBeOptimizedAway(); 47 } 48 } 49 } 50 51 public static void snippet03(int a) { 52 if (a * 0 == 6) { 53 shouldBeOptimizedAway(); 54 } 55 } 56 57 @Test 58 public void testConditionalEliminated01() { 59 assertOptimized("snippet01"); 60 } 61 62 @Test 63 public void testConditionalEliminated02() { 64 assertOptimized("snippet02"); 65 } 66 67 @Test 68 public void testConditionalEliminated03() { 69 assertOptimized("snippet03"); 70 } 71 72 private void assertOptimized(String snippet) { 73 assertOptimizedAway(prepareGraph(snippet)); 74 } 75 76 private StructuredGraph prepareGraph(String snippet) { 77 StructuredGraph graph = parseEager(snippet, AllowAssumptions.NO); 78 HighTierContext context = getDefaultHighTierContext(); 79 CanonicalizerPhase c = new CanonicalizerPhase(); 80 c.apply(graph, context); 81 new DominatorConditionalEliminationPhase(false).apply(graph, context); 82 c.apply(graph, context); 83 return graph; 84 } 85 86 }