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1 /* |
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2 * Copyright (c) 2015, 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 8073670 |
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27 * @summary Test that causes C2 to fold two NaNs with different values into a single NaN. |
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28 * |
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29 * @run main/othervm -XX:-TieredCompilation -Xcomp |
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30 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_inf |
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31 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_zero |
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32 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_nan |
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33 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_inf |
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34 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_zero |
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35 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_nan |
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36 * compiler.c2.FloatingPointFoldingTest |
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37 */ |
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38 |
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39 package compiler.c2; |
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40 |
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41 public class FloatingPointFoldingTest { |
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42 // Double values. |
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43 public static final long MINUS_INF_LONGBITS = 0xfff0000000000000L; |
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44 public static final double DOUBLE_MINUS_INF = Double.longBitsToDouble(MINUS_INF_LONGBITS); |
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45 |
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46 public static final long PLUS_INF_LONGBITS = 0x7ff0000000000000L; |
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47 public static final double DOUBLE_PLUS_INF = Double.longBitsToDouble(PLUS_INF_LONGBITS); |
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48 |
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49 public static final long MINUS_ZERO_LONGBITS = 0x8000000000000000L; |
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50 public static final double DOUBLE_MINUS_ZERO = Double.longBitsToDouble(MINUS_ZERO_LONGBITS); |
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51 |
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52 // We need two different NaN values. A floating point number is |
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53 // considered to be NaN is the sign bit is 0, all exponent bits |
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54 // are set to 1, and at least one bit of the exponent is not zero. |
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55 // |
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56 // As java.lang.Double.NaN is 0x7ff8000000000000L, we use |
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57 // 0x7ffc000000000000L as a second NaN double value. |
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58 public static final long NAN_LONGBITS = 0x7ffc000000000000L; |
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59 public static final double DOUBLE_NAN = Double.longBitsToDouble(NAN_LONGBITS); |
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60 |
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61 // Float values. |
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62 public static final int MINUS_INF_INTBITS = 0xff800000; |
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63 public static final float FLOAT_MINUS_INF = Float.intBitsToFloat(MINUS_INF_INTBITS); |
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64 |
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65 public static final int PLUS_INF_INTBITS = 0x7f800000; |
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66 public static final float FLOAT_PLUS_INF = Float.intBitsToFloat(PLUS_INF_INTBITS); |
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67 |
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68 public static final int MINUS_ZERO_INTBITS = 0x80000000; |
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69 public static final float FLOAT_MINUS_ZERO = Float.intBitsToFloat(MINUS_ZERO_INTBITS); |
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70 |
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71 // As java.lang.Float.NaN is 0x7fc00000, we use 0x7fe00000 |
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72 // as a second NaN float value. |
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73 public static final int NAN_INTBITS = 0x7fe00000; |
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74 public static final float FLOAT_NAN = Float.intBitsToFloat(NAN_INTBITS); |
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75 |
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76 |
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77 // Double tests. |
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78 static void test_double_inf(long[] result) { |
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79 double d1 = DOUBLE_MINUS_INF; |
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80 double d2 = DOUBLE_PLUS_INF; |
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81 result[0] = Double.doubleToRawLongBits(d1); |
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82 result[1] = Double.doubleToRawLongBits(d2); |
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83 } |
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84 |
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85 static void test_double_zero(long[] result) { |
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86 double d1 = DOUBLE_MINUS_ZERO; |
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87 double d2 = 0; |
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88 result[0] = Double.doubleToRawLongBits(d1); |
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89 result[1] = Double.doubleToRawLongBits(d2); |
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90 } |
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91 |
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92 static void test_double_nan(long[] result) { |
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93 double d1 = DOUBLE_NAN; |
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94 double d2 = Double.NaN; |
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95 result[0] = Double.doubleToRawLongBits(d1); |
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96 result[1] = Double.doubleToRawLongBits(d2); |
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97 } |
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98 |
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99 // Float tests. |
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100 static void test_float_inf(int[] result) { |
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101 float f1 = FLOAT_MINUS_INF; |
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102 float f2 = FLOAT_PLUS_INF; |
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103 result[0] = Float.floatToRawIntBits(f1); |
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104 result[1] = Float.floatToRawIntBits(f2); |
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105 } |
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106 |
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107 static void test_float_zero(int[] result) { |
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108 float f1 = FLOAT_MINUS_ZERO; |
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109 float f2 = 0; |
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110 result[0] = Float.floatToRawIntBits(f1); |
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111 result[1] = Float.floatToRawIntBits(f2); |
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112 } |
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113 |
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114 static void test_float_nan(int[] result) { |
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115 float f1 = FLOAT_NAN; |
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116 float f2 = Float.NaN; |
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117 result[0] = Float.floatToRawIntBits(f1); |
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118 result[1] = Float.floatToRawIntBits(f2); |
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119 } |
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120 |
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121 // Check doubles. |
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122 static void check_double(long[] result, double d1, double d2) { |
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123 if (result[0] == result[1]) { |
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124 throw new RuntimeException("ERROR: Two different double values are considered equal. \n" |
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125 + String.format("\toriginal values: 0x%x 0x%x\n", Double.doubleToRawLongBits(d1), Double.doubleToRawLongBits(d2)) |
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126 + String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1])); |
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127 } |
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128 } |
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129 |
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130 // Check floats. |
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131 static void check_float(int[] result, float f1, float f2) { |
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132 if (result[0] == result[1]) { |
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133 throw new RuntimeException("ERROR: Two different float values are considered equal. \n" |
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134 + String.format("\toriginal values: 0x%x 0x%x\n", Float.floatToRawIntBits(f1), Float.floatToRawIntBits(f2)) |
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135 + String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1])); |
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136 } |
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137 } |
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138 |
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139 public static void main(String[] args) { |
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140 // Float tests. |
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141 |
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142 int[] iresult = new int[2]; |
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143 |
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144 // -Inf and +Inf. |
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145 test_float_inf(iresult); |
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146 check_float(iresult, FLOAT_MINUS_INF, FLOAT_PLUS_INF); |
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147 |
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148 // 0 and -0. |
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149 test_float_zero(iresult); |
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150 check_float(iresult, FLOAT_MINUS_ZERO, 0); |
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151 |
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152 // Diferrent NaNs. |
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153 test_float_nan(iresult); |
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154 check_float(iresult, FLOAT_NAN, Float.NaN); |
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155 |
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156 // Double tests. |
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157 |
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158 long[] lresult = new long[2]; |
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159 |
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160 // -Inf and +Inf. |
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161 test_double_inf(lresult); |
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162 check_double(lresult, DOUBLE_MINUS_INF, DOUBLE_PLUS_INF); |
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163 |
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164 // 0 and -0. |
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165 test_double_zero(lresult); |
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166 check_double(lresult, DOUBLE_MINUS_ZERO, 0); |
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167 |
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168 // Diferrent NaNs. |
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169 test_double_nan(lresult); |
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170 check_double(lresult, DOUBLE_NAN, Double.NaN); |
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171 } |
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172 } |