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annotate test/compiler/6823354/Test6823354.java @ 20543:e7d0505c8a30

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8059758: Footprint regressions with JDK-8038423 Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything. Reviewed-by: jwilhelm, brutisso
author tschatzl
date Fri, 10 Oct 2014 15:51:58 +0200
parents c18cbe5936b8
children
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1 /*
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2 * Copyright (c) 2009, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23
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24 /**
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25 * @test
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26 * @bug 6823354
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27 * @summary These methods can be instrinsified by using bit scan, bit test, and population count instructions.
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28 *
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29 * @run main/othervm -Xcomp -XX:CompileOnly=Test6823354.lzcomp,Test6823354.tzcomp,.dolzcomp,.dotzcomp Test6823354
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30 */
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31
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32 import java.net.URLClassLoader;
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33
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34 public class Test6823354 {
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35 // Arrays of corner case values.
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36 static final int[] ia = new int[] { 0, 1, -1, Integer.MIN_VALUE, Integer.MAX_VALUE };
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37 static final long[] la = new long[] { 0L, 1L, -1L, Long.MIN_VALUE, Long.MAX_VALUE };
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38
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39 public static void main(String[] args) throws Exception {
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40 // Load the classes and the methods.
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41 Integer.numberOfLeadingZeros(0);
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42 Integer.numberOfTrailingZeros(0);
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43 Long.numberOfLeadingZeros(0);
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44 Long.numberOfTrailingZeros(0);
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45
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46 lz();
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47 tz();
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48 }
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49
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50 static void lz() throws Exception {
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51 // int
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52
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53 // Test corner cases.
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54 for (int i = 0; i < ia.length; i++) {
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55 int x = ia[i];
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56 check(x, lzcomp(x), lzint(x));
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57 }
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58
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59 // Test all possible return values.
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60 for (int i = 0; i < Integer.SIZE; i++) {
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61 int x = 1 << i;
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62 check(x, lzcomp(x), lzint(x));
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63 }
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64
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65 String classname = "Test6823354$lzconI";
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66
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67 // Test Ideal optimizations (constant values).
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68 for (int i = 0; i < ia.length; i++) {
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69 testclass(classname, ia[i]);
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70 }
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71
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72 // Test Ideal optimizations (constant values).
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73 for (int i = 0; i < Integer.SIZE; i++) {
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74 int x = 1 << i;
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75 testclass(classname, x);
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76 }
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77
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78
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79 // long
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80
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81 // Test corner cases.
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82 for (int i = 0; i < ia.length; i++) {
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83 long x = la[i];
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84 check(x, lzcomp(x), lzint(x));
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85 }
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86
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87 // Test all possible return values.
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88 for (int i = 0; i < Long.SIZE; i++) {
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89 long x = 1L << i;
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90 check(x, lzcomp(x), lzint(x));
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91 }
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92
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93 classname = "Test6823354$lzconL";
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94
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95 // Test Ideal optimizations (constant values).
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96 for (int i = 0; i < la.length; i++) {
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97 testclass(classname, la[i]);
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98 }
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99
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100 // Test Ideal optimizations (constant values).
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101 for (int i = 0; i < Long.SIZE; i++) {
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102 long x = 1L << i;
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103 testclass(classname, x);
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104 }
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105 }
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106
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107 static void tz() throws Exception {
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108 // int
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109
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110 // Test corner cases.
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111 for (int i = 0; i < ia.length; i++) {
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112 int x = ia[i];
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113 check(x, tzcomp(x), tzint(x));
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114 }
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115
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116 // Test all possible return values.
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117 for (int i = 0; i < Integer.SIZE; i++) {
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118 int x = 1 << i;
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119 check(x, tzcomp(x), tzint(x));
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120 }
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121
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122 String classname = "Test6823354$tzconI";
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123
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124 // Test Ideal optimizations (constant values).
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125 for (int i = 0; i < ia.length; i++) {
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126 testclass(classname, ia[i]);
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127 }
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128
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129 // Test Ideal optimizations (constant values).
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130 for (int i = 0; i < Integer.SIZE; i++) {
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131 int x = 1 << i;
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132 testclass(classname, x);
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133 }
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134
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135
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136 // long
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137
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138 // Test corner cases.
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139 for (int i = 0; i < la.length; i++) {
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140 long x = la[i];
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141 check(x, tzcomp(x), tzint(x));
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142 }
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143
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144 // Test all possible return values.
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145 for (int i = 0; i < Long.SIZE; i++) {
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146 long x = 1L << i;
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147 check(x, tzcomp(x), tzint(x));
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148 }
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149
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150 classname = "Test6823354$tzconL";
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151
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152 // Test Ideal optimizations (constant values).
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153 for (int i = 0; i < la.length; i++) {
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154 testclass(classname, la[i]);
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155 }
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156
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157 // Test Ideal optimizations (constant values).
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158 for (int i = 0; i < Long.SIZE; i++) {
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159 long x = 1L << i;
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160 testclass(classname, x);
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161 }
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162 }
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163
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164 static void check(int value, int result, int expected) {
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165 //System.out.println(value + ": " + result + ", " + expected);
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166 if (result != expected)
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167 throw new InternalError(value + " failed: " + result + " != " + expected);
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168 }
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169
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170 static void check(long value, long result, long expected) {
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171 //System.out.println(value + ": " + result + ", " + expected);
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172 if (result != expected)
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173 throw new InternalError(value + " failed: " + result + " != " + expected);
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174 }
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175
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176 static int lzint( int i) { return Integer.numberOfLeadingZeros(i); }
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177 static int lzcomp(int i) { return Integer.numberOfLeadingZeros(i); }
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178
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179 static int lzint( long l) { return Long.numberOfLeadingZeros(l); }
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180 static int lzcomp(long l) { return Long.numberOfLeadingZeros(l); }
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181
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182 static int tzint( int i) { return Integer.numberOfTrailingZeros(i); }
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183 static int tzcomp(int i) { return Integer.numberOfTrailingZeros(i); }
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184
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185 static int tzint( long l) { return Long.numberOfTrailingZeros(l); }
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186 static int tzcomp(long l) { return Long.numberOfTrailingZeros(l); }
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187
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188 static void testclass(String classname, int x) throws Exception {
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189 System.setProperty("value", "" + x);
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190 loadandrunclass(classname);
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191 }
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192
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193 static void testclass(String classname, long x) throws Exception {
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194 System.setProperty("value", "" + x);
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195 loadandrunclass(classname);
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196 }
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197
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198 static void loadandrunclass(String classname) throws Exception {
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199 Class cl = Class.forName(classname);
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200 URLClassLoader apploader = (URLClassLoader) cl.getClassLoader();
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201 ClassLoader loader = new URLClassLoader(apploader.getURLs(), apploader.getParent());
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202 Class c = loader.loadClass(classname);
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203 Runnable r = (Runnable) c.newInstance();
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204 r.run();
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205 }
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206
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207 public static class lzconI implements Runnable {
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208 static final int VALUE;
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209
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210 static {
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211 int value = 0;
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212 try {
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213 value = Integer.decode(System.getProperty("value"));
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214 } catch (Throwable e) {}
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215 VALUE = value;
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216 }
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217
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218 public void run() { check(VALUE, lzint(VALUE), dolzcomp()); }
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219 static int dolzcomp() { return lzcomp(VALUE); }
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220 }
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221
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222 public static class lzconL implements Runnable {
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223 static final long VALUE;
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224
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225 static {
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226 long value = 0;
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227 try {
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228 value = Long.decode(System.getProperty("value"));
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229 } catch (Throwable e) {}
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230 VALUE = value;
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231 }
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232
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233 public void run() { check(VALUE, lzint(VALUE), dolzcomp()); }
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234 static int dolzcomp() { return lzcomp(VALUE); }
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235 }
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236
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237 public static class tzconI implements Runnable {
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238 static final int VALUE;
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239
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240 static {
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241 int value = 0;
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242 try {
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243 value = Integer.decode(System.getProperty("value"));
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244 } catch (Throwable e) {}
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245 VALUE = value;
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246 }
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247
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248 public void run() { check(VALUE, tzint(VALUE), dotzcomp()); }
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249 static int dotzcomp() { return tzcomp(VALUE); }
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250 }
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251
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252 public static class tzconL implements Runnable {
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253 static final long VALUE;
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254
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255 static {
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256 long value = 0;
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257 try {
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258 value = Long.decode(System.getProperty("value"));
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259 } catch (Throwable e) {}
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260 VALUE = value;
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261 }
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262
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263 public void run() { check(VALUE, tzint(VALUE), dotzcomp()); }
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264 static int dotzcomp() { return tzcomp(VALUE); }
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265 }
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266 }