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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NegateNode.java @ 16895:06c15e88d383

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added factory method to all Node classes; replaced Node classes instantiation with calls to factory methods; replaced identity tests on Node classes with ' == <node class>.getGenClass()' idiom
author Doug Simon <doug.simon@oracle.com>
date Mon, 18 Aug 2014 14:04:21 +0200
parents cbd42807a31f
children 0fe4732e5181
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1 /*
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2 * Copyright (c) 2009, 2014, 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.meta.*;
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26 import com.oracle.graal.compiler.common.*;
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27 import com.oracle.graal.graph.spi.*;
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28 import com.oracle.graal.lir.gen.*;
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29 import com.oracle.graal.nodeinfo.*;
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30 import com.oracle.graal.nodes.*;
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31 import com.oracle.graal.nodes.spi.*;
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32 import com.oracle.graal.nodes.type.*;
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33
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34 /**
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35 * The {@code NegateNode} node negates its operand.
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36 */
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37 @NodeInfo
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38 public class NegateNode extends UnaryNode implements ArithmeticLIRLowerable, NarrowableArithmeticNode {
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39
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40 @Override
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41 public boolean inferStamp() {
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42 return updateStamp(StampTool.negate(getValue().stamp()));
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43 }
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44
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45 /**
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46 * Creates new NegateNode instance.
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47 *
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48 * @param value the instruction producing the value that is input to this instruction
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49 */
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50 public static NegateNode create(ValueNode value) {
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51 return new NegateNodeGen(value);
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52 }
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53
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54 protected NegateNode(ValueNode value) {
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55 super(StampTool.negate(value.stamp()), value);
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56 }
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57
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58 public Constant evalConst(Constant... inputs) {
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59 assert inputs.length == 1;
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60 Constant constant = inputs[0];
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61 switch (constant.getKind()) {
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62 case Int:
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63 return Constant.forInt(-(constant.asInt()));
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64 case Long:
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65 return Constant.forLong(-(constant.asLong()));
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66 case Float:
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67 return Constant.forFloat(-(constant.asFloat()));
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68 case Double:
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69 return Constant.forDouble(-(constant.asDouble()));
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70 default:
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71 throw GraalInternalError.shouldNotReachHere("unknown kind " + constant.getKind());
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72 }
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73 }
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74
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75 @Override
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76 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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77 if (forValue.isConstant()) {
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78 return ConstantNode.forConstant(evalConst(forValue.asConstant()), null);
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79 }
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80 if (forValue instanceof NegateNode) {
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81 return ((NegateNode) forValue).getValue();
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82 }
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83 if (forValue instanceof IntegerSubNode) {
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84 IntegerSubNode sub = (IntegerSubNode) forValue;
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85 return IntegerSubNode.create(sub.getY(), sub.getX());
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86 }
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87 return this;
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88 }
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89
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90 @Override
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91 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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92 builder.setResult(this, gen.emitNegate(builder.operand(getValue())));
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93 }
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94 }