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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NegateNode.java @ 5606:5ad40c8ba3ed

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add StampFactory.negate(IntegerStamp), use it for NegateNode
author Gilles Duboscq <duboscq@ssw.jku.at>
date Wed, 13 Jun 2012 13:40:39 +0200
parents 0364a2a874b8
children d71eb56d6bb0
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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.oracle.graal.nodes.calc;
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24
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25 import com.oracle.graal.nodes.*;
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26 import com.oracle.graal.nodes.spi.*;
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27 import com.oracle.graal.nodes.type.*;
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28
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29 /**
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30 * The {@code NegateNode} node negates its operand.
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31 */
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32 public final class NegateNode extends FloatingNode implements Canonicalizable, LIRLowerable {
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33
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34 @Input private ValueNode x;
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35
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36 public ValueNode x() {
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37 return x;
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38 }
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39
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40 /**
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41 * Creates new NegateNode instance.
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42 *
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43 * @param x the instruction producing the value that is input to this instruction
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44 */
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45 public NegateNode(ValueNode x) {
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46 super(x.stamp() instanceof IntegerStamp ? StampFactory.negate((IntegerStamp) x.stamp()) : StampFactory.forKind(x.kind()));
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47 this.x = x;
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48 }
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49
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50 @Override
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51 public ValueNode canonical(CanonicalizerTool tool) {
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52 if (x().isConstant()) {
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53 switch (x().kind()) {
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54 case Int:
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55 return ConstantNode.forInt(-x().asConstant().asInt(), graph());
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56 case Long:
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57 return ConstantNode.forLong(-x().asConstant().asLong(), graph());
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58 case Float:
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59 return ConstantNode.forFloat(-x().asConstant().asFloat(), graph());
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60 case Double:
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61 return ConstantNode.forDouble(-x().asConstant().asDouble(), graph());
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62 }
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63 }
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64 if (x() instanceof NegateNode) {
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65 return ((NegateNode) x()).x();
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66 }
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67 return this;
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68 }
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69
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70 @Override
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71 public void generate(LIRGeneratorTool gen) {
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72 gen.setResult(this, gen.emitNegate(gen.operand(x())));
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73 }
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74 }