annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/MulNode.java @ 18844:5e80dd2f1783

Extend emitMul, emitAdd and emitSub in ArithmeticLIRGenerator for explicitly requesting to set the flags register. (In AMD64 flags are set implicitly, but on SPARC it is not)
author Stefan Anzinger <stefan.anzinger@oracle.com>
date Mon, 12 Jan 2015 19:34:31 +0100
parents 290dc460feb3
children edbac8edc2e1
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1 /*
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2 * Copyright (c) 2011, 2014, 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.code.*;
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26 import com.oracle.graal.api.meta.*;
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27 import com.oracle.graal.compiler.common.type.*;
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28 import com.oracle.graal.compiler.common.type.ArithmeticOpTable.BinaryOp;
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29 import com.oracle.graal.compiler.common.type.ArithmeticOpTable.BinaryOp.Mul;
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30 import com.oracle.graal.graph.spi.*;
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31 import com.oracle.graal.lir.gen.*;
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32 import com.oracle.graal.nodeinfo.*;
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33 import com.oracle.graal.nodes.*;
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34 import com.oracle.graal.nodes.spi.*;
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35
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36 @NodeInfo(shortName = "*")
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37 public class MulNode extends BinaryArithmeticNode<Mul> implements NarrowableArithmeticNode {
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38
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39 public static MulNode create(ValueNode x, ValueNode y) {
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40 return new MulNode(x, y);
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41 }
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42
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43 protected MulNode(ValueNode x, ValueNode y) {
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44 super(ArithmeticOpTable::getMul, x, y);
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45 }
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46
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47 @Override
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48 public ValueNode canonical(CanonicalizerTool tool, ValueNode forX, ValueNode forY) {
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49 ValueNode ret = super.canonical(tool, forX, forY);
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50 if (ret != this) {
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51 return ret;
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52 }
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53
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54 if (forX.isConstant() && !forY.isConstant()) {
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55 return MulNode.create(forY, forX);
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56 }
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57 if (forY.isConstant()) {
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58 BinaryOp<Mul> op = getOp(forX, forY);
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59 Constant c = forY.asConstant();
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60 if (op.isNeutral(c)) {
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61 return forX;
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62 }
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63
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64 if (c instanceof PrimitiveConstant && ((PrimitiveConstant) c).getKind().isNumericInteger()) {
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65 long i = ((PrimitiveConstant) c).asLong();
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66 boolean signFlip = false;
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67 if (i < 0) {
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68 i = -i;
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69 signFlip = true;
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70 }
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71 if (i > 0) {
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72 ValueNode mulResult = null;
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73 long bit1 = i & -i;
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74 long bit2 = i - bit1;
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75 bit2 = bit2 & -bit2; // Extract 2nd bit
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76 if (CodeUtil.isPowerOf2(i)) { //
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77 mulResult = LeftShiftNode.create(forX, ConstantNode.forInt(CodeUtil.log2(i)));
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78 } else if (bit2 + bit1 == i) { // We can work with two shifts and add
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79 ValueNode shift1 = LeftShiftNode.create(forX, ConstantNode.forInt(CodeUtil.log2(bit1)));
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80 ValueNode shift2 = LeftShiftNode.create(forX, ConstantNode.forInt(CodeUtil.log2(bit2)));
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81 mulResult = AddNode.create(shift1, shift2);
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82 } else if (CodeUtil.isPowerOf2(i + 1)) { // shift and subtract
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83 ValueNode shift1 = LeftShiftNode.create(forX, ConstantNode.forInt(CodeUtil.log2(i + 1)));
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84 mulResult = SubNode.create(shift1, forX);
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85 }
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86 if (mulResult != null) {
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87 if (signFlip) {
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88 return NegateNode.create(mulResult);
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89 } else {
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90 return mulResult;
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91 }
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92 }
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93 }
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94 }
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95
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96 if (op.isAssociative()) {
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97 // canonicalize expressions like "(a * 1) * 2"
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98 return reassociate(this, ValueNode.isConstantPredicate(), forX, forY);
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99 }
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100 }
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101 return this;
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102 }
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103
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104 @Override
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105 public void generate(NodeMappableLIRBuilder builder, ArithmeticLIRGenerator gen) {
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106 Value op1 = builder.operand(getX());
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107 Value op2 = builder.operand(getY());
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108 if (!getY().isConstant() && !BinaryArithmeticNode.livesLonger(this, getY(), builder)) {
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109 Value tmp = op1;
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110 op1 = op2;
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111 op2 = tmp;
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112 }
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113 builder.setResult(this, gen.emitMul(op1, op2, false));
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114 }
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115 }