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annotate graal/com.oracle.graal.compiler.amd64/src/com/oracle/graal/compiler/amd64/AMD64AddressLowering.java @ 21784:f4e1d958f1c3

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[AMD64] Create AMD64 specific address nodes.
author Roland Schatz <roland.schatz@oracle.com>
date Mon, 08 Jun 2015 19:19:45 +0200
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children 2766fee1809a
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21784
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
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1 /*
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2 * Copyright (c) 2015, 2015, 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
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
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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
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
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16 * 2 along with this work; if not, write to the Free Software Foundation,
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
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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
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
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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
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24 package com.oracle.graal.compiler.amd64;
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25
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26 import com.oracle.graal.asm.*;
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27 import com.oracle.graal.asm.amd64.AMD64Address.Scale;
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28 import com.oracle.graal.nodes.*;
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29 import com.oracle.graal.nodes.calc.*;
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30 import com.oracle.graal.nodes.memory.address.*;
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31 import com.oracle.graal.phases.common.AddressLoweringPhase.AddressLowering;
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32 import com.oracle.jvmci.code.*;
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33 import com.oracle.jvmci.meta.*;
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34
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35 public class AMD64AddressLowering extends AddressLowering {
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36
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37 private final CodeCacheProvider codeCache;
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38
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39 public AMD64AddressLowering(CodeCacheProvider codeCache) {
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40 this.codeCache = codeCache;
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41 }
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42
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43 @Override
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44 public AddressNode lower(ValueNode address) {
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45 return lower(address, null);
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46 }
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47
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48 @Override
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49 public AddressNode lower(ValueNode base, ValueNode offset) {
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50 AMD64AddressNode ret = new AMD64AddressNode(base, offset);
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51 boolean changed;
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52 do {
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53 changed = improve(ret);
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54 } while (changed);
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55 return base.graph().unique(ret);
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56 }
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57
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58 protected boolean improve(AMD64AddressNode ret) {
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59 ValueNode newBase = improveConstDisp(ret, ret.getBase(), 0);
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60 if (newBase != ret.getBase()) {
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61 ret.setBase(newBase);
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62 return true;
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63 }
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64
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65 ValueNode newIdx = improveConstDisp(ret, ret.getIndex(), ret.getScale().log2);
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66 if (newIdx != ret.getIndex()) {
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67 ret.setIndex(newIdx);
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68 return true;
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69 }
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70
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71 if (ret.getIndex() instanceof LeftShiftNode) {
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72 LeftShiftNode shift = (LeftShiftNode) ret.getIndex();
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73 if (shift.getY().isConstant()) {
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74 int amount = ret.getScale().log2 + shift.getY().asJavaConstant().asInt();
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75 Scale scale = Scale.fromShift(amount);
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76 if (scale != null) {
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77 ret.setIndex(shift.getX());
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78 ret.setScale(scale);
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79 return true;
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80 }
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81 }
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82 }
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83
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84 if (ret.getScale() == Scale.Times1) {
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85 if (ret.getBase() == null || ret.getIndex() == null) {
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86 if (ret.getBase() instanceof AddNode) {
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87 AddNode add = (AddNode) ret.getBase();
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88 ret.setBase(add.getX());
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89 ret.setIndex(add.getY());
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90 return true;
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91 } else if (ret.getIndex() instanceof AddNode) {
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92 AddNode add = (AddNode) ret.getIndex();
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93 ret.setBase(add.getX());
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94 ret.setIndex(add.getY());
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95 return true;
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96 }
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97 }
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98
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99 if (ret.getBase() instanceof LeftShiftNode && !(ret.getIndex() instanceof LeftShiftNode)) {
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100 ValueNode tmp = ret.getBase();
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101 ret.setBase(ret.getIndex());
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102 ret.setIndex(tmp);
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103 return true;
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104 }
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105 }
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106
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107 return false;
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108 }
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109
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110 private ValueNode improveConstDisp(AMD64AddressNode address, ValueNode node, int shift) {
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111 if (node == null) {
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112 return null;
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113 }
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114
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115 if (node.isConstant()) {
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116 return improveConstDisp(address, node, node.asJavaConstant(), null, shift);
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117 } else if (node instanceof AddNode) {
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118 AddNode add = (AddNode) node;
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119 if (add.getX().isConstant()) {
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120 return improveConstDisp(address, node, add.getX().asJavaConstant(), add.getY(), shift);
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121 } else if (add.getY().isConstant()) {
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122 return improveConstDisp(address, node, add.getY().asJavaConstant(), add.getX(), shift);
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123 }
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124 }
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125
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126 return node;
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127 }
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128
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129 private ValueNode improveConstDisp(AMD64AddressNode address, ValueNode original, JavaConstant c, ValueNode other, int shift) {
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130 if (c.getKind().isNumericInteger() && !codeCache.needsDataPatch(c)) {
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131 long disp = address.getDisplacement();
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132 disp += c.asLong() << shift;
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
Roland Schatz <roland.schatz@oracle.com>
parents:
diff changeset
133 if (NumUtil.isInt(disp)) {
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
Roland Schatz <roland.schatz@oracle.com>
parents:
diff changeset
134 address.setDisplacement((int) disp);
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
Roland Schatz <roland.schatz@oracle.com>
parents:
diff changeset
135 return other;
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
Roland Schatz <roland.schatz@oracle.com>
parents:
diff changeset
136 }
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
Roland Schatz <roland.schatz@oracle.com>
parents:
diff changeset
137 }
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
Roland Schatz <roland.schatz@oracle.com>
parents:
diff changeset
138 return original;
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
Roland Schatz <roland.schatz@oracle.com>
parents:
diff changeset
139 }
f4e1d958f1c3 [AMD64] Create AMD64 specific address nodes.
Roland Schatz <roland.schatz@oracle.com>
parents:
diff changeset
140 }