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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/UnsignedRightShiftNode.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 545cd6b3b377
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1 /*
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2 * Copyright (c) 2011, 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.meta.*;
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26 import com.oracle.graal.compiler.common.type.*;
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27 import com.oracle.graal.compiler.common.type.ArithmeticOpTable.ShiftOp.UShr;
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28 import com.oracle.graal.graph.*;
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29 import com.oracle.graal.graph.spi.*;
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30 import com.oracle.graal.lir.gen.*;
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31 import com.oracle.graal.nodeinfo.*;
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32 import com.oracle.graal.nodes.*;
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33 import com.oracle.graal.nodes.spi.*;
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34
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35 @NodeInfo(shortName = ">>>")
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36 public final class UnsignedRightShiftNode extends ShiftNode<UShr> {
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37
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38 public static final NodeClass<UnsignedRightShiftNode> TYPE = NodeClass.create(UnsignedRightShiftNode.class);
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39
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40 public UnsignedRightShiftNode(ValueNode x, ValueNode y) {
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41 super(TYPE, ArithmeticOpTable::getUShr, x, y);
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42 }
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43
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44 @Override
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45 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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46 ValueNode ret = super.canonical(tool, forX, forY);
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47 if (ret != this) {
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48 return ret;
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49 }
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50
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51 if (forY.isConstant()) {
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52 int amount = forY.asJavaConstant().asInt();
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53 int originalAmout = amount;
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54 int mask = getShiftAmountMask();
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55 amount &= mask;
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56 if (amount == 0) {
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57 return forX;
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58 }
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59 if (forX instanceof ShiftNode) {
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60 ShiftNode<?> other = (ShiftNode<?>) forX;
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61 if (other.getY().isConstant()) {
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62 int otherAmount = other.getY().asJavaConstant().asInt() & mask;
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63 if (other instanceof UnsignedRightShiftNode) {
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64 int total = amount + otherAmount;
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65 if (total != (total & mask)) {
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66 return ConstantNode.forIntegerKind(getKind(), 0);
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67 }
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68 return new UnsignedRightShiftNode(other.getX(), ConstantNode.forInt(total));
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69 } else if (other instanceof LeftShiftNode && otherAmount == amount) {
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70 if (getKind() == Kind.Long) {
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71 return new AndNode(other.getX(), ConstantNode.forLong(-1L >>> amount));
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72 } else {
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73 assert getKind() == Kind.Int;
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74 return new AndNode(other.getX(), ConstantNode.forInt(-1 >>> amount));
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75 }
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76 }
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77 }
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78 }
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79 if (originalAmout != amount) {
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80 return new UnsignedRightShiftNode(forX, ConstantNode.forInt(amount));
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81 }
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82 }
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83 return this;
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84 }
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86 @Override
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87 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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88 builder.setResult(this, gen.emitUShr(builder.operand(getX()), builder.operand(getY())));
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89 }
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90 }