1 /*
 2  * Copyright (c) 2020, 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 package org.openjdk.bench.valhalla.ackermann;
24 
25 import org.openjdk.jmh.annotations.Benchmark;
26 import org.openjdk.jmh.annotations.OperationsPerInvocation;
27 
28 public class Primitive64 extends AckermannBase {
29 
30     private static long ack_primitive(long x, long y) {
31         return x == 0 ?
32                 y + 1 :
33                 (y == 0 ?
34                         ack_primitive(x - 1, 1) :
35                         ack_primitive(x - 1, ack_primitive(x, y - 1)));
36     }
37 
38     @Benchmark
39     @OperationsPerInvocation(OPI)
40     public long primitive() {
41         return ack_primitive(X1, Y1)
42                 + ack_primitive(X2, Y2)
43                 + ack_primitive(X3, Y3);
44     }
45 
46 }