Mercurial > hg > graal-jvmci-8
comparison test/compiler/6800154/Test6800154.java @ 567:bbef4344adb2
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 |
parents | |
children | c18cbe5936b8 |
comparison
equal
deleted
inserted
replaced
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 } |