1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 18 public class Main { 19 public static void assertBooleanEquals(boolean expected, boolean result) { 20 if (expected != result) { 21 throw new Error("Expected: " + expected + ", found: " + result); 22 } 23 } 24 25 public static boolean inlinePhi(boolean x, boolean y, boolean z) { 26 boolean phi; 27 if (z) { 28 phi = x; 29 } else { 30 phi = y; 31 } 32 return phi; 33 } 34 35 public static boolean dontUseParam(boolean x) { 36 return false; 37 } 38 39 public static boolean testCase(boolean x, boolean y, boolean z) { 40 // First create a Phi(x, y). 41 boolean phi = inlinePhi(x, y, z); 42 // Now use the phi as a condition which the boolean simplifier will try to 43 // optimize out. If the result is not used, the algorithm will try to remove 44 // the original condition (phi) and crash. 45 return dontUseParam(phi == false ? false : true); 46 } 47 48 public static void main(String[] args) { 49 assertBooleanEquals(false, testCase(true, true, true)); 50 } 51 } 52
