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/dead13.
  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.dead13.dead13
  34  */
  35 
  36 package vm.compiler.jbe.dead.dead13;
  37 
  38 // dead13.java
  39 
  40 /* -- Test the elimination of dead assignments to a chain of array references.
  41       Example:
  42 
  43       void foo()
  44       {
  45          int arr[] = new int[SIZE];
  46          arr[0] = 0;
  47          arr[1] = arr[0];
  48          arr[2] = arr[1];
  49       }
  50 
  51 The assignmnet to arr[2] is dead.  Therefore, arr[1] is not referenced, and the assignment to arr[1] is dead, as is the assignment to arr[0].
  52  */
  53 
  54 public class dead13 {
  55   int SIZE = 30;
  56 
  57   public static void main(String args[]) {
  58     dead13 dce = new dead13();
  59 
  60     System.out.println("f()="+dce.f()+"; fopt()="+dce.fopt());
  61     if (dce.f() == dce.fopt()) {
  62       System.out.println("Test dead13 Passed.");
  63     } else {
  64       throw new Error("Test dead13 Failed: f()=" + dce.f() + " != fopt()=" + dce.fopt());
  65     }
  66   }
  67 
  68   int f() {
  69 
  70     int a[] = new int[SIZE];
  71 
  72     a[0] = 0;
  73     a[1] = a[0] + 1;
  74     a[2] = a[1] + 2;
  75     a[3] = a[2] + 3;
  76     a[4] = a[3] + 4;
  77     a[5] = a[4] + 5;
  78     a[6] = a[5] + 6;
  79     a[7] = a[6] + 7;
  80     a[8] = a[7] + 8;
  81     a[9] = a[8] + 9;
  82     a[10] = a[9] + 10;
  83     a[11] = a[10] + 11;
  84     a[12] = a[11] + 12;
  85     a[13] = a[12] + 13;
  86     a[14] = a[13] + 14;
  87     a[15] = a[14] + 15;
  88     a[16] = a[15] + 16;
  89     a[17] = a[16] + 17;
  90     a[18] = a[17] + 18;
  91     a[19] = a[18] + 19;
  92     a[20] = a[19] + 20;
  93     a[21] = a[20] + 21;
  94     a[22] = a[21] + 22;
  95     a[23] = a[22] + 23;
  96     a[24] = a[23] + 24;
  97     a[25] = a[24] + 25;
  98     a[26] = a[25] + 26;
  99     a[27] = a[26] + 27;
 100     a[28] = a[27] + 28;
 101     a[29] = a[28] + 29;
 102 
 103     return a[1];
 104   }
 105   // Code fragment after dead code elimination
 106   int fopt() {
 107     int a[] = new int[SIZE];
 108 
 109     a[0] = 0;
 110     a[1] = a[0] + 1;
 111 
 112     return a[1];
 113   }
 114 }