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