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comparison test/compiler/intrinsics/mathexact/Verify.java @ 12323:c9ccd7b85f20

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8024924: Intrinsify java.lang.Math.addExact Reviewed-by: kvn, twisti
author rbackman
date Fri, 27 Sep 2013 08:39:19 +0200
parents
children 59e8ad757e19
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12322:72b7e96c1922 12323:c9ccd7b85f20
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 }