1 /* 2 * Copyright (c) 2013, 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 24 public class Verify { 25 public static String throwWord(boolean threw) { 26 return (threw ? "threw" : "didn't throw"); 27 } 28 29 public static void verify(int a, int b) { 30 boolean exception1 = false, exception2 = false; 31 int result1 = 0, result2 = 0; 32 try { 33 result1 = testIntrinsic(a, b); 34 } catch (ArithmeticException e) { 35 exception1 = true; 36 } 37 try { 38 result2 = testNonIntrinsic(a, b); 39 } catch (ArithmeticException e) { 40 exception2 = true; 41 } 42 43 if (exception1 != exception2) { 44 throw new RuntimeException("Intrinsic version " + throwWord(exception1) + " exception, NonIntrinsic version " + throwWord(exception2) + " for: " + a + " + " + b); 45 } 46 if (result1 != result2) { 47 throw new RuntimeException("Intrinsic version returned: " + a + " while NonIntrinsic version returned: " + b); 48 } 49 } 50 51 public static int testIntrinsic(int a, int b) { 52 return java.lang.Math.addExact(a, b); 53 } 54 55 public static int testNonIntrinsic(int a, int b) { 56 return safeAddExact(a, b); 57 } 58 59 // Copied java.lang.Math.addExact to avoid intrinsification 60 public static int safeAddExact(int x, int y) { 61 int r = x + y; 62 // HD 2-12 Overflow iff both arguments have the opposite sign of the result 63 if (((x ^ r) & (y ^ r)) < 0) { 64 throw new ArithmeticException("integer overflow"); 65 } 66 return r; 67 } 68 }