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annotate test/compiler/6661247/Test.java @ 70:b683f557224b

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6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations Summary: copy elimination of a constant value results in incorrect execution Reviewed-by: kvn, sgoldman, rasbold
author never
date Wed, 19 Mar 2008 15:14:36 -0700
parents
children 2a8ec427fbe1
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70
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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1 /*
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2 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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3 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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4 *
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5 *
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6 *
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7 *
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8 *
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9 *
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10 *
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11 *
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12 *
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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13 *
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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14 *
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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15 *
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16 *
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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17 *
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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18 *
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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19 *
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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20 *
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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21 *
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22 */
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23
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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24 /*
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25 * @test
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26 * @bug 6661247
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
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27 * @summary Internal bug in 32-bit HotSpot optimizer while bit manipulations
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28 */
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29
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30 import java.util.Random;
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31 import java.nio.*;
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32
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33 // This isn't a completely reliable test for 6661247 since the results
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34 // depend on what the local schedule looks like but it does reproduce
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35 // the issue in current builds.
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36
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37 public class Test {
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38
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39 public static void test(boolean[] src, int srcPos, LongBuffer dest, long destPos, int count) {
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40 int countStart = (destPos & 63) == 0 ? 0 : 64 - (int)(destPos & 63);
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41 if (countStart > count)
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42 countStart = count;
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43 for (int srcPosMax = srcPos + countStart; srcPos < srcPosMax; srcPos++, destPos++) {
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44 if (src[srcPos])
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45 dest.put((int)(destPos >>> 6), dest.get((int)(destPos >>> 6)) | 1L << (destPos & 63));
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46 else
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47 dest.put((int)(destPos >>> 6), dest.get((int)(destPos >>> 6)) & ~(1L << (destPos & 63)));
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48 }
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49 count -= countStart;
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50 int cnt = count >>> 6;
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51 for (int k = (int)(destPos >>> 6), kMax = k + cnt; k < kMax; k++) {
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52 int low = (src[srcPos] ? 1 : 0)
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53 | (src[srcPos + 1] ? 1 << 1 : 0)
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54 | (src[srcPos + 2] ? 1 << 2 : 0)
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55 | (src[srcPos + 3] ? 1 << 3 : 0)
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56 | (src[srcPos + 4] ? 1 << 4 : 0)
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57 | (src[srcPos + 5] ? 1 << 5 : 0)
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58 | (src[srcPos + 6] ? 1 << 6 : 0)
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59 | (src[srcPos + 7] ? 1 << 7 : 0)
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60 | (src[srcPos + 8] ? 1 << 8 : 0)
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61 | (src[srcPos + 9] ? 1 << 9 : 0)
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62 | (src[srcPos + 10] ? 1 << 10 : 0)
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63 | (src[srcPos + 11] ? 1 << 11 : 0)
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64 | (src[srcPos + 12] ? 1 << 12 : 0)
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65 | (src[srcPos + 13] ? 1 << 13 : 0)
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66 | (src[srcPos + 14] ? 1 << 14 : 0)
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67 | (src[srcPos + 15] ? 1 << 15 : 0)
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68 | (src[srcPos + 16] ? 1 << 16 : 0)
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69 | (src[srcPos + 17] ? 1 << 17 : 0)
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70 | (src[srcPos + 18] ? 1 << 18 : 0)
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71 | (src[srcPos + 19] ? 1 << 19 : 0)
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72 | (src[srcPos + 20] ? 1 << 20 : 0)
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73 | (src[srcPos + 21] ? 1 << 21 : 0)
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74 | (src[srcPos + 22] ? 1 << 22 : 0)
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75 | (src[srcPos + 23] ? 1 << 23 : 0)
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76 | (src[srcPos + 24] ? 1 << 24 : 0)
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77 | (src[srcPos + 25] ? 1 << 25 : 0)
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78 | (src[srcPos + 26] ? 1 << 26 : 0)
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79 | (src[srcPos + 27] ? 1 << 27 : 0)
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80 | (src[srcPos + 28] ? 1 << 28 : 0)
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81 | (src[srcPos + 29] ? 1 << 29 : 0)
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82 | (src[srcPos + 30] ? 1 << 30 : 0)
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83 | (src[srcPos + 31] ? 1 << 31 : 0)
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84 ;
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85 srcPos += 32;
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86 int high = (src[srcPos] ? 1 : 0) // PROBLEM!
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87 | (src[srcPos + 1] ? 1 << 1 : 0)
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88 | (src[srcPos + 2] ? 1 << 2 : 0)
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89 | (src[srcPos + 3] ? 1 << 3 : 0)
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90 | (src[srcPos + 4] ? 1 << 4 : 0)
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91 | (src[srcPos + 5] ? 1 << 5 : 0)
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92 | (src[srcPos + 6] ? 1 << 6 : 0)
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93 | (src[srcPos + 7] ? 1 << 7 : 0)
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94 | (src[srcPos + 8] ? 1 << 8 : 0)
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95 | (src[srcPos + 9] ? 1 << 9 : 0)
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96 | (src[srcPos + 10] ? 1 << 10 : 0)
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97 | (src[srcPos + 11] ? 1 << 11 : 0)
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98 | (src[srcPos + 12] ? 1 << 12 : 0)
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99 | (src[srcPos + 13] ? 1 << 13 : 0)
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100 | (src[srcPos + 14] ? 1 << 14 : 0)
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101 | (src[srcPos + 15] ? 1 << 15 : 0)
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102 | (src[srcPos + 16] ? 1 << 16 : 0)
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103 | (src[srcPos + 17] ? 1 << 17 : 0)
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104 | (src[srcPos + 18] ? 1 << 18 : 0)
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105 | (src[srcPos + 19] ? 1 << 19 : 0)
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106 | (src[srcPos + 20] ? 1 << 20 : 0)
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107 | (src[srcPos + 21] ? 1 << 21 : 0)
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108 | (src[srcPos + 22] ? 1 << 22 : 0)
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109 | (src[srcPos + 23] ? 1 << 23 : 0)
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110 | (src[srcPos + 24] ? 1 << 24 : 0)
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111 | (src[srcPos + 25] ? 1 << 25 : 0)
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112 | (src[srcPos + 26] ? 1 << 26 : 0)
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113 | (src[srcPos + 27] ? 1 << 27 : 0)
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114 | (src[srcPos + 28] ? 1 << 28 : 0)
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115 | (src[srcPos + 29] ? 1 << 29 : 0)
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116 | (src[srcPos + 30] ? 1 << 30 : 0)
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117 | (src[srcPos + 31] ? 1 << 31 : 0)
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118 ;
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119 srcPos += 32;
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120 dest.put(k, ((long)low & 0xFFFFFFFFL) | (((long)high) << 32));
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121 destPos += 64;
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122 }
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123 int countFinish = count & 63;
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124 for (int srcPosMax = srcPos + countFinish; srcPos < srcPosMax; srcPos++, destPos++) {
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125 if (src[srcPos])
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126 dest.put((int)(destPos >>> 6), dest.get((int)(destPos >>> 6)) | 1L << (destPos & 63));
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127 else
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128 dest.put((int)(destPos >>> 6), dest.get((int)(destPos >>> 6)) & ~(1L << (destPos & 63)));
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129 }
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130 }
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131 public static void main(String[] args) {
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132 Random r = new Random();
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133 int entries = 1000;
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134 boolean[] src = new boolean[entries * 64];
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135 long[] dest = new long[entries];
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136 long[] result = new long[entries];
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137
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138 for (int c = 0; c < 2000; c++) {
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139 for (int i = 0; i < entries; i++) {
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140 long l = r.nextLong();
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141 for (int bit = 0; bit < 64; bit++) {
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142 src[i * 64 + bit] = (l & (1L << bit)) != 0;
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143 }
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144 dest[i] = 0;
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145 result[i] = l;
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146 }
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147 test(src, 0, LongBuffer.wrap(dest, 0, dest.length), 0, src.length);
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148 for (int i = 0; i < entries; i++) {
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149 if (dest[i] != result[i]) {
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150 throw new InternalError(i + ": " + Long.toHexString(dest[i]) + " != " + Long.toHexString(result[i]));
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151 }
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152 }
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153 }
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
never
parents:
diff changeset
154 }
b683f557224b 6661247: Internal bug in 32-bit HotSpot optimizer while bit manipulations
never
parents:
diff changeset
155 }