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comparison test/compiler/7199742/Test7199742.java @ 6824:f13867c41f73

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7199742: A lot of C2 OSR compilations of the same method's bci Summary: Don't clone head of OSR loop. Reviewed-by: jrose, twisti
author kvn
date Tue, 02 Oct 2012 14:49:21 -0700
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6823:859c45fb8cea 6824:f13867c41f73
1 /*
2 * Copyright (c) 2012, 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 7199742
28 * @summary A lot of C2 OSR compilations of the same method's bci
29 *
30 * @run main/othervm -Xmx32m -Xbatch Test7199742
31 */
32
33 public class Test7199742 {
34 private static final int ITERS = 10000000;
35 public static void main(String args[]) {
36 Test7199742 t = new Test7199742();
37 for (int i=0; i<10; i++) {
38 test(t, 7);
39 }
40 }
41 static Test7199742 test(Test7199742 t, int m) {
42 int i = -(ITERS/2);
43 if (i == 0) return null;
44 Test7199742 v = null;
45 while(i < ITERS) {
46 if ((i&m) == 0) {
47 v = t;
48 }
49 i++;
50 }
51 return v;
52 }
53 }
54