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annotate graal/GraalCompiler/src/com/sun/c1x/ir/ArithmeticOp.java @ 2538:e1ba5a93e997

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Clean up on Value class and LIRGenerator/LIRItem-related things.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 20:13:54 +0200
parents 16b9a8b5ad39
children 0f9eeb15e636
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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 private boolean isStrictFP;
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40
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41 /**
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42 * Creates a new arithmetic operation.
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43 * @param opcode the bytecode opcode
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44 * @param kind the result kind of the operation
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45 * @param x the first input instruction
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46 * @param y the second input instruction
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47 * @param isStrictFP indicates this operation has strict rounding semantics
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48 * @param stateBefore the state for instructions that may trap
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49 */
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50 public ArithmeticOp(int opcode, CiKind kind, Value x, Value y, boolean isStrictFP, FrameState stateBefore) {
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51 super(kind, opcode, x, y);
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52 this.isStrictFP = isStrictFP;
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53 if (stateBefore != null) {
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54 // state before is only used in the case of a division or remainder,
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55 // and isn't needed if the zero check is redundant
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56 if (y.isConstant()) {
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57 long divisor = y.asConstant().asLong();
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58 if (divisor != 0) {
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59 C1XMetrics.ZeroChecksRedundant++;
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60 setFlag(Flag.NoZeroCheck);
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61 } else {
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62 this.stateBefore = stateBefore;
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63 }
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64 } else {
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65 this.stateBefore = stateBefore;
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66 }
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67 }
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68 }
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69
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70 @Override
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71 public FrameState stateBefore() {
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72 return stateBefore;
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73 }
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74
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75 /**
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76 * Checks whether this instruction has strict fp semantics.
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77 * @return {@code true} if this instruction has strict fp semantics
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78 */
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79 public boolean isStrictFP() {
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80 return isStrictFP;
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81 }
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82
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83 /**
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84 * Checks whether this instruction can cause a trap. For arithmetic operations,
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85 * only division and remainder operations can cause traps.
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86 * @return {@code true} if this instruction can cause a trap
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87 */
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88 @Override
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89 public boolean canTrap() {
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90 return stateBefore != null;
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91 }
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92
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93 @Override
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94 public void accept(ValueVisitor v) {
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95 v.visitArithmeticOp(this);
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96 }
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97
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98 public boolean isCommutative() {
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99 return Bytecodes.isCommutative(opcode);
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100 }
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101
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102 public boolean needsZeroCheck() {
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103 return !checkFlag(Flag.NoZeroCheck);
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104 }
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105
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106 public void eliminateZeroCheck() {
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107 clearRuntimeCheck(Flag.NoZeroCheck);
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108 }
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109
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110 @Override
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111 public void print(LogStream out) {
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112 out.print(x()).print(' ').print(Bytecodes.operator(opcode)).print(' ').print(y());
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113 }
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114 }