Mercurial > hg > graal-jvmci-8
annotate test/compiler/loopopts/CountedLoopProblem.java @ 24007:776cb7cbe2e4
8017629: G1: UseSHM in combination with a G1HeapRegionSize > os::large_page_size() falls back to use small pages
Reviewed-by: pliden, sjohanss, stuefe
author | stefank |
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date | Mon, 25 Apr 2016 11:36:14 +0200 |
parents | 8c791dd1c24d |
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rev | line source |
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22842 | 1 /* |
2 * Copyright (c) 2015, 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 | |
25 /** | |
26 * @test | |
27 * @bug 8072753 | |
28 * @summary Inner loop induction variable increment occurs before compare which causes integer overflow | |
29 * @run main/othervm CountedLoopProblem | |
30 * | |
31 */ | |
32 | |
33 import java.util.*; | |
34 | |
35 public class CountedLoopProblem { | |
36 public static void main(String[] args) throws Exception { | |
37 Random r = new Random(42); | |
38 int x = 0; | |
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39 try { |
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40 StringBuilder sb = new StringBuilder(); |
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41 for(int i = 0; i < 1000000; ++i) { |
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42 int v = Math.abs(r.nextInt()); |
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43 sb.append('+').append(v).append('\n'); |
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44 x += v; |
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45 // To trigger the problem we must OSR in the following loop |
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46 // To make the problem 100% reproducible run with -XX:-TieredCompilation -XX:OSROnlyBCI=62 |
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47 while(x < 0) x += 1000000000; |
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48 sb.append('=').append(x).append('\n'); |
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49 } |
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50 if (sb.toString().hashCode() != 0xaba94591) { |
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51 throw new Exception("Unexpected result"); |
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52 } |
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53 } catch(OutOfMemoryError e) { |
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54 // small heap, ignore |
22842 | 55 } |
56 } | |
57 } | |
58 |