Mercurial > hg > truffle
annotate src/share/vm/opto/mathexactnode.cpp @ 14702:d4dd5204c0aa
Merge
author | ehelin |
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date | Fri, 14 Mar 2014 13:27:18 +0100 |
parents | cd5d10655495 |
children | 4ca6dc0799b6 |
rev | line source |
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12323 | 1 /* |
2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #include "precompiled.hpp" | |
26 #include "memory/allocation.inline.hpp" | |
27 #include "opto/addnode.hpp" | |
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28 #include "opto/cfgnode.hpp" |
12323 | 29 #include "opto/machnode.hpp" |
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30 #include "opto/matcher.hpp" |
12323 | 31 #include "opto/mathexactnode.hpp" |
32 #include "opto/subnode.hpp" | |
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; |
12323 | 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; |
12323 | 45 } |
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46 return true; |
12323 | 47 } |
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; |
12323 | 54 } |
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55 }; |
12323 | 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 |