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annotate graal/Compiler/src/com/sun/c1x/ir/ArithmeticOp.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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children
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2507
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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.sun.c1x.ir;
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24
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25 import com.sun.c1x.*;
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26 import com.sun.c1x.debug.*;
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27 import com.sun.c1x.value.*;
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28 import com.sun.cri.bytecode.*;
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29 import com.sun.cri.ci.*;
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30
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31 /**
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32 * The {@code ArithmeticOp} class represents arithmetic operations such as addition, subtraction, etc.
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33 *
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34 * @author Ben L. Titzer
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35 */
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36 public final class ArithmeticOp extends Op2 {
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37
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38 private FrameState stateBefore;
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39
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40 /**
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41 * Creates a new arithmetic operation.
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42 * @param opcode the bytecode opcode
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43 * @param kind the result kind of the operation
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44 * @param x the first input instruction
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45 * @param y the second input instruction
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46 * @param isStrictFP indicates this operation has strict rounding semantics
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47 * @param stateBefore the state for instructions that may trap
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48 */
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49 public ArithmeticOp(int opcode, CiKind kind, Value x, Value y, boolean isStrictFP, FrameState stateBefore) {
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50 super(kind, opcode, x, y);
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51 initFlag(Flag.IsStrictFP, isStrictFP);
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52 if (stateBefore != null) {
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53 // state before is only used in the case of a division or remainder,
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54 // and isn't needed if the zero check is redundant
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55 if (y.isConstant()) {
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56 long divisor = y.asConstant().asLong();
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57 if (divisor != 0) {
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58 C1XMetrics.ZeroChecksRedundant++;
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59 setFlag(Flag.NoZeroCheck);
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60 } else {
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61 this.stateBefore = stateBefore;
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62 }
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63 if (divisor != -1) {
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64 C1XMetrics.DivideSpecialChecksRedundant++;
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65 setFlag(Flag.NoDivSpecialCase);
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66 }
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67 } else {
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68 this.stateBefore = stateBefore;
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69 }
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70 }
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71 }
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72
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73 @Override
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74 public FrameState stateBefore() {
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75 return stateBefore;
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76 }
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77
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78 /**
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79 * Checks whether this instruction has strict fp semantics.
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80 * @return {@code true} if this instruction has strict fp semantics
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81 */
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82 public boolean isStrictFP() {
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83 return checkFlag(Flag.IsStrictFP);
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84 }
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85
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86 /**
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87 * Checks whether this instruction can cause a trap. For arithmetic operations,
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88 * only division and remainder operations can cause traps.
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89 * @return {@code true} if this instruction can cause a trap
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90 */
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91 @Override
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92 public boolean canTrap() {
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93 return stateBefore != null;
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94 }
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95
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96 @Override
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97 public void accept(ValueVisitor v) {
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98 v.visitArithmeticOp(this);
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99 }
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100
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101 public boolean isCommutative() {
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102 return Bytecodes.isCommutative(opcode);
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103 }
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104
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105 public boolean needsZeroCheck() {
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106 return !checkFlag(Flag.NoZeroCheck);
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107 }
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108
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109 public void eliminateZeroCheck() {
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110 clearRuntimeCheck(Flag.NoZeroCheck);
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111 }
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112
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113 @Override
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114 public void print(LogStream out) {
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115 out.print(x()).
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116 print(' ').
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117 print(Bytecodes.operator(opcode)).
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118 print(' ').
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119 print(y());
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120 }
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121 }