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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ReinterpretNode.java @ 19529:8fc336a04d77

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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 48c1ebd24120
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1 /*
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2 * Copyright (c) 2013, 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 java.nio.*;
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26
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27 import com.oracle.graal.api.meta.*;
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28 import com.oracle.graal.compiler.common.type.*;
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29 import com.oracle.graal.graph.*;
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30 import com.oracle.graal.graph.spi.*;
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31 import com.oracle.graal.lir.gen.*;
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32 import com.oracle.graal.nodeinfo.*;
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33 import com.oracle.graal.nodes.*;
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34 import com.oracle.graal.nodes.spi.*;
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35
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36 /**
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37 * The {@code ReinterpretNode} class represents a reinterpreting conversion that changes the stamp
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38 * of a primitive value to some other incompatible stamp. The new stamp must have the same width as
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39 * the old stamp.
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40 */
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41 @NodeInfo
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42 public final class ReinterpretNode extends UnaryNode implements ArithmeticLIRLowerable {
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43
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44 public static final NodeClass<ReinterpretNode> TYPE = NodeClass.create(ReinterpretNode.class);
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45
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46 public ReinterpretNode(Kind to, ValueNode value) {
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47 this(StampFactory.forKind(to), value);
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48 }
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49
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50 public ReinterpretNode(Stamp to, ValueNode value) {
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51 super(TYPE, to, value);
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52 assert to instanceof ArithmeticStamp;
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53 }
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54
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55 private SerializableConstant evalConst(SerializableConstant c) {
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56 /*
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57 * We don't care about byte order here. Either would produce the correct result.
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58 */
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59 ByteBuffer buffer = ByteBuffer.wrap(new byte[c.getSerializedSize()]).order(ByteOrder.nativeOrder());
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60 c.serialize(buffer);
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61
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62 buffer.rewind();
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63 SerializableConstant ret = ((ArithmeticStamp) stamp()).deserialize(buffer);
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64
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65 assert !buffer.hasRemaining();
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66 return ret;
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67 }
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68
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69 @Override
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70 public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
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71 if (forValue.isConstant()) {
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72 return ConstantNode.forConstant(stamp(), evalConst((SerializableConstant) forValue.asConstant()), null);
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73 }
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74 if (stamp().isCompatible(forValue.stamp())) {
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75 return forValue;
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76 }
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77 if (forValue instanceof ReinterpretNode) {
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78 ReinterpretNode reinterpret = (ReinterpretNode) forValue;
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79 return new ReinterpretNode(stamp(), reinterpret.getValue());
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80 }
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81 return this;
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82 }
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83
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84 @Override
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85 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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86 LIRKind kind = gen.getLIRKind(stamp());
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87 builder.setResult(this, gen.emitReinterpret(kind, builder.operand(getValue())));
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88 }
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89
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90 public static ValueNode reinterpret(Kind toKind, ValueNode value) {
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91 return value.graph().unique(new ReinterpretNode(toKind, value));
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92 }
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93
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94 @NodeIntrinsic
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95 public static native float reinterpret(@ConstantNodeParameter Kind kind, int value);
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96
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97 @NodeIntrinsic
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98 public static native int reinterpret(@ConstantNodeParameter Kind kind, float value);
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99
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100 @NodeIntrinsic
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101 public static native double reinterpret(@ConstantNodeParameter Kind kind, long value);
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102
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103 @NodeIntrinsic
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104 public static native long reinterpret(@ConstantNodeParameter Kind kind, double value);
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105 }