Mercurial > hg > graal-jvmci-8
annotate graal/GraalCompiler/src/com/sun/c1x/ir/ArithmeticOp.java @ 2538:e1ba5a93e997
Clean up on Value class and LIRGenerator/LIRItem-related things.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 20:13:54 +0200 |
parents | 16b9a8b5ad39 |
children | 0f9eeb15e636 |
rev | line source |
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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 } |