1 /*
2  * Copyright (c) 2002, 2018, 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 
24 /*
25  * @test
26  *
27  * @summary converted from VM Testbase runtime/jbe/dead/dead16.
28  * VM Testbase keywords: [quick, runtime]
29  *
30  * @library /vmTestbase
31  *          /test/lib
32  * @run driver jdk.test.lib.FileInstaller . .
33  * @run main/othervm vm.compiler.jbe.dead.dead16.dead16
34  */
35 
36 package vm.compiler.jbe.dead.dead16;
37 
38 // dead16.java
39 
40 /* -- Test the elimination of redundant code.
41       Example:
42 
43       double x;
44       x = x + 0;
45       x = x + 1;
46       x = x - 1;
47       return x;
48  */
49 class doit {
pause1(double x)50     static final double pause1(double x) {
51         for(int k = 1; k <= 10000; k++) {
52             x = x + 1.0;
53         }
54         return x;
55     }
56 
pause2(double x)57     static final double pause2(double x) {
58         for(int k = 1; k <= 10000; k++) {
59             x = x - 1.0;
60         }
61         return x;
62     }
63 }
64 
65 public class dead16 {
66     static double c = 1;
67     static double z = 0;
main(String args[])68     public static void main(String args[]) {
69 
70         System.out.println("un_optimized()="+un_optimized()+"; hand_optimized()="+hand_optimized());
71         if (un_optimized() == hand_optimized()) {
72             System.out.println("Test dead16 Passed.");
73         } else {
74             throw new Error("Test dead16 Failed: un_optimized()=" + un_optimized() + " != hand_optimized()=" + hand_optimized());
75         }
76     }
77 
un_optimized()78     static double un_optimized() {
79         double x = 1;
80         // example 1
81         x = x + 0;
82         x = x - 0;
83         x = x * 1;
84         x = x / 1;
85 
86         // example 2
87         x = x + c;
88         x = x - c;
89         x = x * c;
90         x = x / c;
91 
92         // example 3
93         x = x + z;
94         x = x - z;
95         x = x * (z + c);
96 
97         // example 4
98         x = doit.pause1(x);
99         x = doit.pause2(x);
100         x = doit.pause2(x);
101         x = doit.pause1(x);
102         x = doit.pause1(x);
103         x = doit.pause1(x);
104         x = doit.pause2(x);
105         x = doit.pause1(x);
106         x = doit.pause2(x);
107         x = doit.pause2(x);
108         x = doit.pause2(x);
109         x = doit.pause1(x);
110 
111         return x;
112     }
113 
114     // Code fragment after redundent code elimination
hand_optimized()115     static double hand_optimized() {
116         int k;
117         double x = 1;
118         // example 1
119 
120         // example 2
121 
122         // example 3
123 
124         // example 4
125         k = 10001;
126 
127         return x;
128     }
129 }
130