Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/ir/Condition.java @ 2522:58c05e4c51e2
Removing two more HIR instructions.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 16:43:31 +0200 |
parents | 16b9a8b5ad39 |
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rev | line source |
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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 } |