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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ZeroExtendNode.java @ 19526:8fc336a04d77

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Create TYPE fields for LIRInstruction and CompositeValue. Renaming NodeClass#get to NodeClass#create.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Fri, 20 Feb 2015 22:22:55 +0100
parents 61d3cb8e1280
children 93c50cefb9e8
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1 /*
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2 * Copyright (c) 2014, 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 package com.oracle.graal.nodes.calc;
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24
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25 import com.oracle.graal.api.code.*;
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26 import com.oracle.graal.compiler.common.calc.*;
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27 import com.oracle.graal.compiler.common.type.*;
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28 import com.oracle.graal.compiler.common.type.ArithmeticOpTable.*;
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29 import com.oracle.graal.compiler.common.type.ArithmeticOpTable.IntegerConvertOp.*;
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30 import com.oracle.graal.graph.*;
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31 import com.oracle.graal.graph.spi.*;
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32 import com.oracle.graal.lir.gen.*;
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33 import com.oracle.graal.nodeinfo.*;
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34 import com.oracle.graal.nodes.*;
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35 import com.oracle.graal.nodes.spi.*;
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36
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37 /**
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38 * The {@code ZeroExtendNode} converts an integer to a wider integer using zero extension.
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39 */
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40 @NodeInfo
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41 public final class ZeroExtendNode extends IntegerConvertNode<ZeroExtend, Narrow> {
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42
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43 public static final NodeClass<ZeroExtendNode> TYPE = NodeClass.create(ZeroExtendNode.class);
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44
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45 public ZeroExtendNode(ValueNode input, int resultBits) {
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46 this(input, PrimitiveStamp.getBits(input.stamp()), resultBits);
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47 assert 0 < PrimitiveStamp.getBits(input.stamp()) && PrimitiveStamp.getBits(input.stamp()) <= resultBits;
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48 }
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49
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50 public ZeroExtendNode(ValueNode input, int inputBits, int resultBits) {
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51 super(TYPE, ArithmeticOpTable::getZeroExtend, ArithmeticOpTable::getNarrow, inputBits, resultBits, input);
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52 }
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53
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54 public static ValueNode create(ValueNode input, int resultBits) {
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55 return create(input, PrimitiveStamp.getBits(input.stamp()), resultBits);
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56 }
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57
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58 public static ValueNode create(ValueNode input, int inputBits, int resultBits) {
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59 IntegerConvertOp<ZeroExtend> signExtend = ArithmeticOpTable.forStamp(input.stamp()).getZeroExtend();
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60 ValueNode synonym = findSynonym(signExtend, input, inputBits, resultBits, signExtend.foldStamp(inputBits, resultBits, input.stamp()));
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61 if (synonym != null) {
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62 return synonym;
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63 } else {
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64 return new ZeroExtendNode(input, inputBits, resultBits);
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65 }
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66 }
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67
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68 @Override
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69 public boolean isLossless() {
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70 return true;
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71 }
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72
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73 @Override
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74 public boolean preservesOrder(Condition cond) {
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75 switch (cond) {
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76 case GE:
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77 case GT:
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78 case LE:
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79 case LT:
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80 return false;
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81 default:
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82 return true;
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83 }
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84 }
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85
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86 @Override
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87 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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88 ValueNode ret = super.canonical(tool, forValue);
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89 if (ret != this) {
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90 return ret;
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91 }
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92
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93 if (forValue instanceof ZeroExtendNode) {
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94 // xxxx -(zero-extend)-> 0000 xxxx -(zero-extend)-> 00000000 0000xxxx
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95 // ==> xxxx -(zero-extend)-> 00000000 0000xxxx
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96 ZeroExtendNode other = (ZeroExtendNode) forValue;
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97 return new ZeroExtendNode(other.getValue(), other.getInputBits(), getResultBits());
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98 }
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99 if (forValue instanceof NarrowNode) {
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100 NarrowNode narrow = (NarrowNode) forValue;
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101 Stamp inputStamp = narrow.getValue().stamp();
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102 if (inputStamp instanceof IntegerStamp && inputStamp.isCompatible(stamp())) {
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103 IntegerStamp istamp = (IntegerStamp) inputStamp;
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104 long mask = CodeUtil.mask(PrimitiveStamp.getBits(narrow.stamp()));
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105 if (((istamp.upMask() | istamp.downMask()) & ~mask) == 0) {
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106 // The original value is in the range of the masked zero extended result so
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107 // simply return the original input.
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108 return narrow.getValue();
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109 }
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110 }
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111 }
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112
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113 return this;
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114 }
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115
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116 @Override
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117 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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118 builder.setResult(this, gen.emitZeroExtend(builder.operand(getValue()), getInputBits(), getResultBits()));
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119 }
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120 }