Mercurial > hg > graal-compiler
diff 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 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/compiler/6800154/Test6800154.java Fri Feb 13 09:09:35 2009 -0800 @@ -0,0 +1,109 @@ +/* + * Copyright 2009 Sun Microsystems, Inc. All Rights Reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + */ + +/** + * @test + * @bug 6800154 + * @summary Add comments to long_by_long_mulhi() for better understandability + * + * @run main/othervm -Xcomp -XX:CompileOnly=Test6800154.divcomp Test6800154 + */ + +import java.net.URLClassLoader; + +public class Test6800154 implements Runnable { + static final long[] DIVIDENDS = { + 0, + 1, + 2, + 1423487, + 4444441, + 4918923241323L, + -1, + -24351, + 0x3333, + 0x0000000080000000L, + 0x7fffffffffffffffL, + 0x8000000000000000L + }; + + static final long[] DIVISORS = { + 1, + 2, + 17, + 12342, + 24123, + 143444, + 123444442344L, + -1, + -2, + -4423423234231423L, + 0x0000000080000000L, + 0x7fffffffffffffffL, + 0x8000000000000000L + }; + + // Initialize DIVISOR so that it is final in this class. + static final long DIVISOR; + + static { + long value = 0; + try { + value = Long.decode(System.getProperty("divisor")); + } catch (Throwable e) { + } + DIVISOR = value; + } + + public static void main(String[] args) throws Exception + { + Class cl = Class.forName("Test6800154"); + URLClassLoader apploader = (URLClassLoader) cl.getClassLoader(); + + // Iterate over all divisors. + for (int i = 0; i < DIVISORS.length; i++) { + System.setProperty("divisor", "" + DIVISORS[i]); + ClassLoader loader = new URLClassLoader(apploader.getURLs(), apploader.getParent()); + Class c = loader.loadClass("Test6800154"); + Runnable r = (Runnable) c.newInstance(); + r.run(); + } + } + + public void run() + { + // Iterate over all dividends. + for (int i = 0; i < DIVIDENDS.length; i++) { + long dividend = DIVIDENDS[i]; + + long expected = divint(dividend); + long result = divcomp(dividend); + + if (result != expected) + throw new InternalError(dividend + " / " + DIVISOR + " failed: " + result + " != " + expected); + } + } + + static long divint(long a) { return a / DIVISOR; } + static long divcomp(long a) { return a / DIVISOR; } +}