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annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/gen/risc/field/SignDependentOperations.java @ 4142:bc8527f3071c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, 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 package com.sun.max.asm.gen.risc.field;
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24
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25 import java.util.*;
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26
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27 import com.sun.max.asm.gen.risc.bitRange.*;
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28
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29 /**
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30 */
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31 public enum SignDependentOperations {
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32
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33 UNSIGNED {
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34 @Override
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35 public int minArgumentValue(BitRange bitRange) {
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36 return 0;
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37 }
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38
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39 @Override
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40 public int maxArgumentValue(BitRange bitRange) {
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41 return bitRange.valueMask();
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42 }
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43
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44 @Override
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45 public int assemble(int unsignedInt, BitRange bitRange) throws IndexOutOfBoundsException {
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46 return bitRange.assembleUnsignedInt(unsignedInt);
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47 }
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48
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49 @Override
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50 public int extract(int instruction, BitRange bitRange) {
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51 return bitRange.extractUnsignedInt(instruction);
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52 }
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53
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54 @Override
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55 public List<Integer> legalTestArgumentValues(int min, int max, int grain) {
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56 assert min == 0;
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57 assert grain > 0;
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58 assert max >= grain;
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59 final List<Integer> result = smallContiguousRange(min, max, grain);
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60 return result == null ? Arrays.asList(0, grain, max - grain, max) : result;
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61 }
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62 },
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63
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64 SIGNED {
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65
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66 @Override
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67 public int minArgumentValue(BitRange bitRange) {
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68 return -1 << (bitRange.width() - 1);
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69 }
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70
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71 @Override
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72 public int maxArgumentValue(BitRange bitRange) {
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73 return bitRange.valueMask() >>> 1;
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74 }
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75
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76 @Override
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77 public int assemble(int signedInt, BitRange bitRange) throws IndexOutOfBoundsException {
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78 return bitRange.assembleSignedInt(signedInt);
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79 }
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80
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81 @Override
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82 public int extract(int instruction, BitRange bitRange) {
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83 return bitRange.extractSignedInt(instruction);
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84 }
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85
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86 @Override
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87 public List<Integer> legalTestArgumentValues(int min, int max, int grain) {
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88 assert min < 0;
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89 assert grain > 0;
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90 assert max >= grain;
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91 final List<Integer> result = smallContiguousRange(min, max, grain);
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92 return result == null ? Arrays.asList(min, min + grain, -grain, 0, grain, max - grain, max) : null;
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93 }
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94 },
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95
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96 SIGNED_OR_UNSIGNED {
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97
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98 @Override
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99 public int minArgumentValue(BitRange bitRange) {
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100 return SIGNED.minArgumentValue(bitRange);
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101 }
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102
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103 @Override
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104 public int maxArgumentValue(BitRange bitRange) {
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105 return UNSIGNED.maxArgumentValue(bitRange);
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106 }
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107
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108 @Override
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109 public int assemble(int value, BitRange bitRange) throws IndexOutOfBoundsException {
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110 return (value >= 0) ? UNSIGNED.assemble(value, bitRange) : SIGNED.assemble(value, bitRange);
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111 }
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112
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113 @Override
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114 public int extract(int instruction, BitRange bitRange) {
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115 return UNSIGNED.extract(instruction, bitRange);
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116 }
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117
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118 @Override
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119 public List<Integer> legalTestArgumentValues(int min, int max, int grain) {
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120 assert min < 0;
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121 assert grain > 0;
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122 assert max >= grain;
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123 final List<Integer> result = smallContiguousRange(min, max, grain);
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124 return result == null ? Arrays.asList(
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125 // We only test positive arguments, since negative ones would be returned as positive by extract()
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126 // and that is correct, because there is no way to tell just by the instruction which sign was meant
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127 0, grain, max / 2, max - grain, max
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128 ) : null;
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129 }
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130 };
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131
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132 /**
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133 * Creates a sequence of all the integers inclusive between a given min and max if the
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134 * sequence contains 32 or less items. Otherwise, this method returns null.
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135 */
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136 public static List<Integer> smallContiguousRange(int min, int max, int grain) {
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137 final long range = (((long) max - (long) min) + 1) / grain;
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138 if (range > 0 && range <= 32) {
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139 final List<Integer> result = new ArrayList<>((int) range);
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140 for (int i = min; i <= max; i += grain * 2) {
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141 result.add(i);
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142 }
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143 return result;
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144 }
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145 return null;
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146 }
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147
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148 public abstract int minArgumentValue(BitRange bitRange);
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149
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150 public abstract int maxArgumentValue(BitRange bitRange);
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151
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152 /**
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153 * @return instruction
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154 * @throws IndexOutOfBoundsException
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155 */
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156 public abstract int assemble(int value, BitRange bitRange) throws IndexOutOfBoundsException;
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157
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158 public abstract int extract(int instruction, BitRange bitRange);
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159
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160 public abstract List<Integer> legalTestArgumentValues(int min, int max, int grain);
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161 }