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 }