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annotate src/share/vm/opto/mathexactnode.cpp @ 17726:085b304a1cc5

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8027754: Enable loop optimizations for loops with MathExact inside Reviewed-by: kvn, iveresov
author rbackman
date Thu, 23 Jan 2014 12:08:28 +0100
parents 59e8ad757e19
children 4ca6dc0799b6
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1 /*
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2 * Copyright (c) 2013, 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 *
c9ccd7b85f20 8024924: Intrinsify java.lang.Math.addExact
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5 * This code is free software; you can redistribute it and/or modify it
c9ccd7b85f20 8024924: Intrinsify java.lang.Math.addExact
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6 * under the terms of the GNU General Public License version 2 only, as
c9ccd7b85f20 8024924: Intrinsify java.lang.Math.addExact
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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
c9ccd7b85f20 8024924: Intrinsify java.lang.Math.addExact
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
c9ccd7b85f20 8024924: Intrinsify java.lang.Math.addExact
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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
c9ccd7b85f20 8024924: Intrinsify java.lang.Math.addExact
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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
c9ccd7b85f20 8024924: Intrinsify java.lang.Math.addExact
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25 #include "precompiled.hpp"
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26 #include "memory/allocation.inline.hpp"
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27 #include "opto/addnode.hpp"
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28 #include "opto/cfgnode.hpp"
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29 #include "opto/machnode.hpp"
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30 #include "opto/matcher.hpp"
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31 #include "opto/mathexactnode.hpp"
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32 #include "opto/subnode.hpp"
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33
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34 template <typename OverflowOp>
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35 class AddHelper {
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36 public:
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37 typedef typename OverflowOp::TypeClass TypeClass;
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38 typedef typename TypeClass::NativeType NativeType;
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39
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40 static bool will_overflow(NativeType value1, NativeType value2) {
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41 NativeType result = value1 + value2;
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42 // Hacker's Delight 2-12 Overflow if both arguments have the opposite sign of the result
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43 if (((value1 ^ result) & (value2 ^ result)) >= 0) {
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44 return false;
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45 }
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46 return true;
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47 }
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48
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49 static bool can_overflow(const Type* type1, const Type* type2) {
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50 if (type1 == TypeClass::ZERO || type2 == TypeClass::ZERO) {
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51 return false;
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52 }
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53 return true;
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54 }
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55 };
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56
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57 template <typename OverflowOp>
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58 class SubHelper {
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59 public:
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60 typedef typename OverflowOp::TypeClass TypeClass;
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61 typedef typename TypeClass::NativeType NativeType;
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62
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63 static bool will_overflow(NativeType value1, NativeType value2) {
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64 NativeType result = value1 - value2;
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65 // hacker's delight 2-12 overflow iff the arguments have different signs and
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66 // the sign of the result is different than the sign of arg1
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67 if (((value1 ^ value2) & (value1 ^ result)) >= 0) {
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68 return false;
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69 }
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70 return true;
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71 }
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72
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73 static bool can_overflow(const Type* type1, const Type* type2) {
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74 if (type2 == TypeClass::ZERO) {
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75 return false;
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76 }
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77 return true;
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78 }
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79 };
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80
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81 template <typename OverflowOp>
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82 class MulHelper {
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83 public:
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84 typedef typename OverflowOp::TypeClass TypeClass;
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85
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86 static bool can_overflow(const Type* type1, const Type* type2) {
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87 if (type1 == TypeClass::ZERO || type2 == TypeClass::ZERO) {
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88 return false;
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89 } else if (type1 == TypeClass::ONE || type2 == TypeClass::ONE) {
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90 return false;
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91 }
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92 return true;
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93 }
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94 };
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95
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96 bool OverflowAddINode::will_overflow(jint v1, jint v2) const {
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97 return AddHelper<OverflowAddINode>::will_overflow(v1, v2);
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98 }
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99
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100 bool OverflowSubINode::will_overflow(jint v1, jint v2) const {
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101 return SubHelper<OverflowSubINode>::will_overflow(v1, v2);
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102 }
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103
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104 bool OverflowMulINode::will_overflow(jint v1, jint v2) const {
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105 jlong result = (jlong) v1 * (jlong) v2;
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106 if ((jint) result == result) {
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107 return false;
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108 }
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109 return true;
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110 }
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111
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112 bool OverflowAddLNode::will_overflow(jlong v1, jlong v2) const {
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113 return AddHelper<OverflowAddLNode>::will_overflow(v1, v2);
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114 }
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115
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116 bool OverflowSubLNode::will_overflow(jlong v1, jlong v2) const {
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117 return SubHelper<OverflowSubLNode>::will_overflow(v1, v2);
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118 }
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119
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120 bool OverflowMulLNode::will_overflow(jlong val1, jlong val2) const {
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121 jlong result = val1 * val2;
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122 jlong ax = (val1 < 0 ? -val1 : val1);
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123 jlong ay = (val2 < 0 ? -val2 : val2);
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124
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125 bool overflow = false;
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126 if ((ax | ay) & CONST64(0xFFFFFFFF00000000)) {
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127 // potential overflow if any bit in upper 32 bits are set
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128 if ((val1 == min_jlong && val2 == -1) || (val2 == min_jlong && val1 == -1)) {
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129 // -1 * Long.MIN_VALUE will overflow
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130 overflow = true;
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131 } else if (val2 != 0 && (result / val2 != val1)) {
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132 overflow = true;
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133 }
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134 }
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135
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136 return overflow;
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137 }
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138
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139 bool OverflowAddINode::can_overflow(const Type* t1, const Type* t2) const {
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140 return AddHelper<OverflowAddINode>::can_overflow(t1, t2);
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141 }
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142
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143 bool OverflowSubINode::can_overflow(const Type* t1, const Type* t2) const {
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144 if (in(1) == in(2)) {
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145 return false;
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146 }
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147 return SubHelper<OverflowSubINode>::can_overflow(t1, t2);
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148 }
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149
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150 bool OverflowMulINode::can_overflow(const Type* t1, const Type* t2) const {
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151 return MulHelper<OverflowMulINode>::can_overflow(t1, t2);
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152 }
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153
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154 bool OverflowAddLNode::can_overflow(const Type* t1, const Type* t2) const {
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155 return AddHelper<OverflowAddLNode>::can_overflow(t1, t2);
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156 }
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157
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158 bool OverflowSubLNode::can_overflow(const Type* t1, const Type* t2) const {
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159 if (in(1) == in(2)) {
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160 return false;
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161 }
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162 return SubHelper<OverflowSubLNode>::can_overflow(t1, t2);
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163 }
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164
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165 bool OverflowMulLNode::can_overflow(const Type* t1, const Type* t2) const {
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166 return MulHelper<OverflowMulLNode>::can_overflow(t1, t2);
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167 }
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168
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169 const Type* OverflowNode::sub(const Type* t1, const Type* t2) const {
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170 fatal(err_msg_res("sub() should not be called for '%s'", NodeClassNames[this->Opcode()]));
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171 return TypeInt::CC;
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172 }
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173
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174 template <typename OverflowOp>
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175 struct IdealHelper {
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176 typedef typename OverflowOp::TypeClass TypeClass; // TypeInt, TypeLong
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177 typedef typename TypeClass::NativeType NativeType;
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178
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179 static Node* Ideal(const OverflowOp* node, PhaseGVN* phase, bool can_reshape) {
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180 Node* arg1 = node->in(1);
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181 Node* arg2 = node->in(2);
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182 const Type* type1 = phase->type(arg1);
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183 const Type* type2 = phase->type(arg2);
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184
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185 if (type1 == NULL || type2 == NULL) {
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186 return NULL;
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187 }
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188
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189 if (type1 != Type::TOP && type1->singleton() &&
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190 type2 != Type::TOP && type2->singleton()) {
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191 NativeType val1 = TypeClass::as_self(type1)->get_con();
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192 NativeType val2 = TypeClass::as_self(type2)->get_con();
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193 if (node->will_overflow(val1, val2) == false) {
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194 Node* con_result = ConINode::make(phase->C, 0);
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195 return con_result;
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196 }
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197 return NULL;
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198 }
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199 return NULL;
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200 }
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201
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202 static const Type* Value(const OverflowOp* node, PhaseTransform* phase) {
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203 const Type *t1 = phase->type( node->in(1) );
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204 const Type *t2 = phase->type( node->in(2) );
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205 if( t1 == Type::TOP ) return Type::TOP;
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206 if( t2 == Type::TOP ) return Type::TOP;
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207
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208 const TypeClass* i1 = TypeClass::as_self(t1);
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209 const TypeClass* i2 = TypeClass::as_self(t2);
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210
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211 if (i1 == NULL || i2 == NULL) {
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212 return TypeInt::CC;
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213 }
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214
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215 if (t1->singleton() && t2->singleton()) {
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216 NativeType val1 = i1->get_con();
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217 NativeType val2 = i2->get_con();
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218 if (node->will_overflow(val1, val2)) {
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219 return TypeInt::CC;
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220 }
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221 return TypeInt::ZERO;
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222 } else if (i1 != TypeClass::TYPE_DOMAIN && i2 != TypeClass::TYPE_DOMAIN) {
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223 if (node->will_overflow(i1->_lo, i2->_lo)) {
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224 return TypeInt::CC;
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225 } else if (node->will_overflow(i1->_lo, i2->_hi)) {
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226 return TypeInt::CC;
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227 } else if (node->will_overflow(i1->_hi, i2->_lo)) {
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228 return TypeInt::CC;
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229 } else if (node->will_overflow(i1->_hi, i2->_hi)) {
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230 return TypeInt::CC;
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231 }
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232 return TypeInt::ZERO;
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233 }
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234
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235 if (!node->can_overflow(t1, t2)) {
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236 return TypeInt::ZERO;
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237 }
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238 return TypeInt::CC;
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239 }
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240 };
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241
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242 Node* OverflowINode::Ideal(PhaseGVN* phase, bool can_reshape) {
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243 return IdealHelper<OverflowINode>::Ideal(this, phase, can_reshape);
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244 }
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245
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246 Node* OverflowLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
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247 return IdealHelper<OverflowLNode>::Ideal(this, phase, can_reshape);
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248 }
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249
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250 const Type* OverflowINode::Value(PhaseTransform* phase) const {
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251 return IdealHelper<OverflowINode>::Value(this, phase);
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252 }
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253
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254 const Type* OverflowLNode::Value(PhaseTransform* phase) const {
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255 return IdealHelper<OverflowLNode>::Value(this, phase);
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256 }
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257