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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/LeftShiftNode.java @ 11851:04b039d82e86

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Simplify constant folding.
author Roland Schatz <roland.schatz@oracle.com>
date Wed, 02 Oct 2013 12:09:51 +0200
parents 2ad1435489d1
children 673f93db4adc
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1 /*
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2 * Copyright (c) 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.api.meta.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.nodes.spi.*;
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29 import com.oracle.graal.nodes.type.*;
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30
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31 @NodeInfo(shortName = "<<")
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32 public final class LeftShiftNode extends ShiftNode implements Canonicalizable {
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33
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34 public LeftShiftNode(Kind kind, ValueNode x, ValueNode y) {
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35 super(kind, x, y);
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36 }
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37
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38 @Override
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39 public boolean inferStamp() {
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40 return updateStamp(StampTool.leftShift(x().stamp(), y().stamp()));
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41 }
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42
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43 @Override
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44 public Constant evalConst(Constant... inputs) {
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45 assert inputs.length == 2;
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46 if (kind() == Kind.Int) {
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47 return Constant.forInt(inputs[0].asInt() << inputs[1].asInt());
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48 } else {
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49 assert kind() == Kind.Long;
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50 return Constant.forLong(inputs[0].asLong() << inputs[1].asLong());
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51 }
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52 }
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53
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54 @Override
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55 public ValueNode canonical(CanonicalizerTool tool) {
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56 if (x().isConstant() && y().isConstant()) {
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57 return ConstantNode.forPrimitive(evalConst(x().asConstant(), y().asConstant()), graph());
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58 } else if (y().isConstant()) {
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59 int amount = y().asConstant().asInt();
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60 int originalAmout = amount;
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61 int mask;
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62 if (kind() == Kind.Int) {
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63 mask = 0x1f;
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64 } else {
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65 assert kind() == Kind.Long;
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66 mask = 0x3f;
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67 }
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68 amount &= mask;
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69 if (amount == 0) {
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70 return x();
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71 }
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72 if (x() instanceof ShiftNode) {
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73 ShiftNode other = (ShiftNode) x();
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74 if (other.y().isConstant()) {
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75 int otherAmount = other.y().asConstant().asInt() & mask;
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76 if (other instanceof LeftShiftNode) {
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77 int total = amount + otherAmount;
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78 if (total != (total & mask)) {
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79 return ConstantNode.forIntegerKind(kind(), 0, graph());
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80 }
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81 return graph().unique(new LeftShiftNode(kind(), other.x(), ConstantNode.forInt(total, graph())));
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82 } else if ((other instanceof RightShiftNode || other instanceof UnsignedRightShiftNode) && otherAmount == amount) {
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83 if (kind() == Kind.Long) {
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84 return graph().unique(new AndNode(kind(), other.x(), ConstantNode.forLong(-1L << amount, graph())));
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85 } else {
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86 assert kind() == Kind.Int;
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87 return graph().unique(new AndNode(kind(), other.x(), ConstantNode.forInt(-1 << amount, graph())));
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88 }
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89 }
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90 }
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91 }
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92 if (originalAmout != amount) {
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93 return graph().unique(new LeftShiftNode(kind(), x(), ConstantNode.forInt(amount, graph())));
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94 }
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95 }
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96 return this;
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97 }
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98
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99 @Override
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100 public void generate(ArithmeticLIRGenerator gen) {
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101 gen.setResult(this, gen.emitShl(gen.operand(x()), gen.operand(y())));
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102 }
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103 }