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comparison test/compiler/6800154/Test6800154.java @ 567:bbef4344adb2

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6800154: Add comments to long_by_long_mulhi() for better understandability Summary: This patch adds a comment pointing to the Hacker's Delight version of the algorithm plus a verbatim copy of it. Furthermore it adds inline comments. Reviewed-by: kvn, jrose
author twisti
date Fri, 13 Feb 2009 09:09:35 -0800
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children c18cbe5936b8
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566:91263420e1c6 567:bbef4344adb2
1 /*
2 * Copyright 2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 */
23
24 /**
25 * @test
26 * @bug 6800154
27 * @summary Add comments to long_by_long_mulhi() for better understandability
28 *
29 * @run main/othervm -Xcomp -XX:CompileOnly=Test6800154.divcomp Test6800154
30 */
31
32 import java.net.URLClassLoader;
33
34 public class Test6800154 implements Runnable {
35 static final long[] DIVIDENDS = {
36 0,
37 1,
38 2,
39 1423487,
40 4444441,
41 4918923241323L,
42 -1,
43 -24351,
44 0x3333,
45 0x0000000080000000L,
46 0x7fffffffffffffffL,
47 0x8000000000000000L
48 };
49
50 static final long[] DIVISORS = {
51 1,
52 2,
53 17,
54 12342,
55 24123,
56 143444,
57 123444442344L,
58 -1,
59 -2,
60 -4423423234231423L,
61 0x0000000080000000L,
62 0x7fffffffffffffffL,
63 0x8000000000000000L
64 };
65
66 // Initialize DIVISOR so that it is final in this class.
67 static final long DIVISOR;
68
69 static {
70 long value = 0;
71 try {
72 value = Long.decode(System.getProperty("divisor"));
73 } catch (Throwable e) {
74 }
75 DIVISOR = value;
76 }
77
78 public static void main(String[] args) throws Exception
79 {
80 Class cl = Class.forName("Test6800154");
81 URLClassLoader apploader = (URLClassLoader) cl.getClassLoader();
82
83 // Iterate over all divisors.
84 for (int i = 0; i < DIVISORS.length; i++) {
85 System.setProperty("divisor", "" + DIVISORS[i]);
86 ClassLoader loader = new URLClassLoader(apploader.getURLs(), apploader.getParent());
87 Class c = loader.loadClass("Test6800154");
88 Runnable r = (Runnable) c.newInstance();
89 r.run();
90 }
91 }
92
93 public void run()
94 {
95 // Iterate over all dividends.
96 for (int i = 0; i < DIVIDENDS.length; i++) {
97 long dividend = DIVIDENDS[i];
98
99 long expected = divint(dividend);
100 long result = divcomp(dividend);
101
102 if (result != expected)
103 throw new InternalError(dividend + " / " + DIVISOR + " failed: " + result + " != " + expected);
104 }
105 }
106
107 static long divint(long a) { return a / DIVISOR; }
108 static long divcomp(long a) { return a / DIVISOR; }
109 }