/*
* @(#)TestLongShiftSpeed.java 1.6 06/10/10
*
* Copyright 1990-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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 program 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 at /legal/license.txt).
*
* 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 or visit www.sun.com if you need additional
* information or have any questions.
*
*/
//
// @(#)TestLongShiftSpeed.java 1.2 02/03/02
// Measures the speed of computing long shifts.
//
public class TestLongShiftSpeed
{
public static void main(String[] args) {
long value = 0x21223123adfca251L;
long j;
int iterations = Integer.parseInt(args[0]);
long t0 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
j = (value >>> i);
}
long t1 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
j = value;
}
long t2 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
j = (value >> i);
}
long t3 = System.currentTimeMillis();
for (int i = 0; i < iterations; ++i) {
j = (value << i);
}
long t4 = System.currentTimeMillis();
System.out.println("null loop " + iterations + " iterations in " +
(t2 - t1) + "ms");
System.out.println("lushr " + iterations + " iterations in " +
(t1 - t0 - (t2 - t1)) + "ms");
System.out.println("lshr " + iterations + " iterations in " +
(t3 - t2 - (t2 - t1)) + "ms");
System.out.println("lshl " + iterations + " iterations in " +
(t4 - t3 - (t2 - t1)) + "ms");
}
}