Mercurial > hg > truffle
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/LogicConstantNode.java @ 15877:f55153a2ca55
Stop propagating probability above loop header.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 13 May 2014 03:57:06 +0200 |
parents | d5a1206e1923 |
children | dc1f9c606f36 |
rev | line source |
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7767
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separate BooleanNode and ConstantNode hierarchy, rename BooleanNode to LogicNode and LogicNode to BitLogicNode
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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; |
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24 |
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25 import com.oracle.graal.graph.*; |
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26 import com.oracle.graal.nodes.spi.*; |
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27 |
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28 /** |
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29 * The {@code LogicConstantNode} represents a boolean constant. |
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30 */ |
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31 @NodeInfo(nameTemplate = "{p#value}") |
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32 public class LogicConstantNode extends LogicNode implements LIRLowerable { |
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33 |
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34 public final boolean value; |
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35 |
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36 protected LogicConstantNode(boolean value) { |
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37 super(); |
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38 this.value = value; |
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39 } |
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40 |
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41 /** |
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42 * Returns a node for a boolean constant. |
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43 * |
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44 * @param v the boolean value for which to create the instruction |
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45 * @param graph |
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46 * @return a node representing the boolean |
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47 */ |
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48 public static LogicConstantNode forBoolean(boolean v, Graph graph) { |
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49 return graph.unique(new LogicConstantNode(v)); |
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50 } |
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51 |
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52 /** |
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53 * Gets a constant for {@code true}. |
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54 */ |
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55 public static LogicConstantNode tautology(Graph graph) { |
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56 return forBoolean(true, graph); |
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57 } |
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58 |
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59 /** |
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60 * Gets a constant for {@code false}. |
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61 */ |
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62 public static LogicConstantNode contradiction(Graph graph) { |
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63 return forBoolean(false, graph); |
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64 } |
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65 |
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66 public boolean getValue() { |
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67 return value; |
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68 } |
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69 |
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70 @Override |
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71 public void generate(NodeLIRBuilderTool generator) { |
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72 // nothing to do |
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73 } |
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74 } |