Mercurial > hg > graal-compiler
annotate graal/Compiler/src/com/sun/c1x/ir/ArithmeticOp.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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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 } |