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annotate graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/nodes/IntegerMulExactNode.java @ 10484:0097fb11c16f

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Add basic version of Graal's Truffle runtime.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 23 Jun 2013 21:44:15 +0200
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10484
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1 /*
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2 * Copyright (c) 2013, 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.truffle.nodes;
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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.nodes.*;
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27 import com.oracle.graal.nodes.calc.*;
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28 import com.oracle.graal.nodes.spi.*;
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29 import com.oracle.truffle.api.*;
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30
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31 /**
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32 * Node representing an exact integer multiplication that will throw an {@link ArithmeticException}
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33 * in case the addition would overflow the 32 bit range.
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34 */
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35 public class IntegerMulExactNode extends IntegerMulNode implements Canonicalizable, IntegerExactArithmeticNode {
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36
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37 public IntegerMulExactNode(ValueNode x, ValueNode y) {
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38 super(x.kind(), x, y);
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39 assert x.kind() == y.kind() && (x.kind() == Kind.Int || x.kind() == Kind.Long);
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40 }
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41
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42 @Override
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43 public ValueNode canonical(CanonicalizerTool tool) {
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44 if (x().isConstant() && !y().isConstant()) {
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45 return graph().unique(new IntegerMulExactNode(y(), x()));
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46 }
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47 if (x().isConstant()) {
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48 try {
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49 if (kind() == Kind.Int) {
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50 return ConstantNode.forInt(ExactMath.multiplyExact(x().asConstant().asInt(), y().asConstant().asInt()), graph());
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51 } else {
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52 assert kind() == Kind.Long;
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53 return ConstantNode.forLong(ExactMath.multiplyExact(x().asConstant().asLong(), y().asConstant().asLong()), graph());
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54 }
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55 } catch (ArithmeticException ex) {
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56 // The operation will result in an overflow exception, so do not canonicalize.
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57 }
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58 } else if (y().isConstant()) {
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59 long c = y().asConstant().asLong();
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60 if (c == 1) {
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61 return x();
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62 }
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63 if (c == 0) {
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64 return ConstantNode.defaultForKind(kind(), graph());
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65 }
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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 IntegerExactArithmeticSplitNode createSplit(AbstractBeginNode next, AbstractBeginNode deopt) {
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72 return graph().add(new IntegerMulExactSplitNode(stamp(), x(), y(), next, deopt));
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73 }
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74
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75 @Override
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76 public void lower(LoweringTool tool, LoweringType loweringType) {
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77 IntegerExactArithmeticSplitNode.lower(tool, this);
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78 }
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79
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80 @NodeIntrinsic
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81 public static native int multiplyExact(int a, int b);
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82
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83 @NodeIntrinsic
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84 public static native long multiplyExact(long a, long b);
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85 }