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annotate graal/com.oracle.max.graal.compiler/src/com/sun/c1x/ir/Condition.java @ 2872:0341b6424579

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Project renaming.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 08 Jun 2011 08:42:25 +0200
parents graal/GraalCompiler/src/com/sun/c1x/ir/Condition.java@16b9a8b5ad39
children
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1 /*
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2 * Copyright (c) 2009, 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.c1x.ir;
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24
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25 import com.sun.cri.bytecode.Bytecodes.*;
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26 import com.sun.cri.ci.*;
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27 import com.sun.cri.ri.*;
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28
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29 /**
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30 * Condition codes used in conditionals.
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31 */
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32 public enum Condition {
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33 /**
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34 * Equal.
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35 */
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36 EQ("=="),
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37
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38 /**
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39 * Not equal.
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40 */
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41 NE("!="),
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42
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43 /**
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44 * Signed less than.
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45 */
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46 LT("<"),
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47
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48 /**
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49 * Signed less than or equal.
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50 */
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51 LE("<="),
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52
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53 /**
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54 * Signed greater than.
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55 */
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56 GT(">"),
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57
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58 /**
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59 * Signed greater than or equal.
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60 */
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61 GE(">="),
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62
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63 /**
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64 * Unsigned greater than or equal ("above than or equal").
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65 */
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66 AE("|>=|"),
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67
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68 /**
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69 * Unsigned less than or equal ("below than or equal").
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70 */
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71 BE("|<=|"),
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72
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73 /**
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74 * Unsigned greater than ("above than").
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75 */
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76 AT("|>|"),
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77
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78 /**
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79 * Unsigned less than ("below than").
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80 */
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81 BT("|<|"),
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82
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83 TRUE("TRUE");
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84
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85 public final String operator;
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86
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87 private Condition(String operator) {
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88 this.operator = operator;
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89 }
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90
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91 public boolean check(int left, int right) {
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92 switch (this) {
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93 case EQ: return left == right;
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94 case NE: return left != right;
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95 case LT: return left < right;
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96 case LE: return left <= right;
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97 case GT: return left > right;
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98 case GE: return left >= right;
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99 case BT: return (left & 0xffffffffL) < (right & 0xffffffffL);
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100 case BE: return (left & 0xffffffffL) <= (right & 0xffffffffL);
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101 case AT: return (left & 0xffffffffL) > (right & 0xffffffffL);
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102 case AE: return (left & 0xffffffffL) >= (right & 0xffffffffL);
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103 }
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104 throw new IllegalArgumentException();
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105 }
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106
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107 /**
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108 * Negate this conditional.
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109 * @return the condition that represents the negation
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110 */
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111 public final Condition negate() {
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112 switch (this) {
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113 case EQ: return NE;
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114 case NE: return EQ;
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115 case LT: return GE;
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116 case LE: return GT;
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117 case GT: return LE;
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118 case GE: return LT;
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119 case BT: return AE;
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120 case BE: return AT;
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121 case AT: return BE;
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122 case AE: return BT;
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123 }
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124 throw new IllegalArgumentException();
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125 }
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126
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127 /**
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128 * Mirror this conditional (i.e. commute "a op b" to "b op' a")
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129 * @return the condition representing the equivalent commuted operation
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130 */
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131 public final Condition mirror() {
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132 switch (this) {
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133 case EQ: return EQ;
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134 case NE: return NE;
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135 case LT: return GT;
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136 case LE: return GE;
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137 case GT: return LT;
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138 case GE: return LE;
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139 case BT: return AT;
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140 case BE: return AE;
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141 case AT: return BT;
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142 case AE: return BE;
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143 }
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144 throw new IllegalArgumentException();
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145 }
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146
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147 /**
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148 * Checks if this conditional operation is commutative.
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149 * @return {@code true} if this operation is commutative
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150 */
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151 public final boolean isCommutative() {
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152 return this == EQ || this == NE;
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153 }
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154
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155 /**
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156 * Attempts to fold a comparison between two constants and return the result.
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157 * @param lt the constant on the left side of the comparison
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158 * @param rt the constant on the right side of the comparison
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159 * @param runtime the RiRuntime (might be needed to compare runtime-specific types)
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160 * @return {@link Boolean#TRUE} if the comparison is known to be true,
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161 * {@link Boolean#FALSE} if the comparison is known to be false, {@code null} otherwise.
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162 */
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163 public Boolean foldCondition(CiConstant lt, CiConstant rt, RiRuntime runtime) {
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164 switch (lt.kind) {
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165 case Int: {
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166 int x = lt.asInt();
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167 int y = rt.asInt();
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168 switch (this) {
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169 case EQ: return x == y;
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170 case NE: return x != y;
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171 case LT: return x < y;
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172 case LE: return x <= y;
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173 case GT: return x > y;
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174 case GE: return x >= y;
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175 case AE: return UnsignedComparisons.aboveOrEqual(x, y);
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176 case BE: return UnsignedComparisons.belowOrEqual(x, y);
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177 case AT: return UnsignedComparisons.aboveThan(x, y);
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178 case BT: return UnsignedComparisons.belowThan(x, y);
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179 }
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180 break;
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181 }
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182 case Long: {
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183 long x = lt.asLong();
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184 long y = rt.asLong();
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185 switch (this) {
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186 case EQ: return x == y;
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187 case NE: return x != y;
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188 case LT: return x < y;
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189 case LE: return x <= y;
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190 case GT: return x > y;
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191 case GE: return x >= y;
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192 }
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193 break;
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194 }
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195 case Object: {
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196 switch (this) {
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197 case EQ: return runtime.areConstantObjectsEqual(lt, rt);
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198 case NE: return !runtime.areConstantObjectsEqual(lt, rt);
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199 }
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200 break;
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201 }
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202 // XXX: folding of floating comparisons should be possible
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203 }
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204 return null;
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205 }
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206 }