Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/compiler/int64-lowering.h" |
| 6 | #include "src/compiler/common-operator.h" |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 7 | #include "src/compiler/diamond.h" |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 8 | #include "src/compiler/graph.h" |
| 9 | #include "src/compiler/linkage.h" |
| 10 | #include "src/compiler/machine-operator.h" |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 11 | #include "src/compiler/node-matchers.h" |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 12 | #include "src/compiler/node-properties.h" |
| 13 | |
| 14 | #include "src/compiler/node.h" |
| 15 | #include "src/wasm/wasm-module.h" |
| 16 | #include "src/zone.h" |
| 17 | |
| 18 | namespace v8 { |
| 19 | namespace internal { |
| 20 | namespace compiler { |
| 21 | |
| 22 | Int64Lowering::Int64Lowering(Graph* graph, MachineOperatorBuilder* machine, |
| 23 | CommonOperatorBuilder* common, Zone* zone, |
| 24 | Signature<MachineRepresentation>* signature) |
| 25 | : zone_(zone), |
| 26 | graph_(graph), |
| 27 | machine_(machine), |
| 28 | common_(common), |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 29 | state_(graph, 3), |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 30 | stack_(zone), |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 31 | replacements_(nullptr), |
| 32 | signature_(signature), |
| 33 | placeholder_(graph->NewNode(common->Parameter(-2, "placeholder"), |
| 34 | graph->start())) { |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 35 | DCHECK_NOT_NULL(graph); |
| 36 | DCHECK_NOT_NULL(graph->end()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 37 | replacements_ = zone->NewArray<Replacement>(graph->NodeCount()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 38 | memset(replacements_, 0, sizeof(Replacement) * graph->NodeCount()); |
| 39 | } |
| 40 | |
| 41 | void Int64Lowering::LowerGraph() { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 42 | if (!machine()->Is32()) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 43 | return; |
| 44 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 45 | stack_.push_back({graph()->end(), 0}); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 46 | state_.Set(graph()->end(), State::kOnStack); |
| 47 | |
| 48 | while (!stack_.empty()) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 49 | NodeState& top = stack_.back(); |
| 50 | if (top.input_index == top.node->InputCount()) { |
| 51 | // All inputs of top have already been lowered, now lower top. |
| 52 | stack_.pop_back(); |
| 53 | state_.Set(top.node, State::kVisited); |
| 54 | LowerNode(top.node); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 55 | } else { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 56 | // Push the next input onto the stack. |
| 57 | Node* input = top.node->InputAt(top.input_index++); |
| 58 | if (state_.Get(input) == State::kUnvisited) { |
| 59 | if (input->opcode() == IrOpcode::kPhi) { |
| 60 | // To break cycles with phi nodes we push phis on a separate stack so |
| 61 | // that they are processed after all other nodes. |
| 62 | PreparePhiReplacement(input); |
| 63 | stack_.push_front({input, 0}); |
| 64 | } else { |
| 65 | stack_.push_back({input, 0}); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 66 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 67 | state_.Set(input, State::kOnStack); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 68 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 69 | } |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | static int GetParameterIndexAfterLowering( |
| 74 | Signature<MachineRepresentation>* signature, int old_index) { |
| 75 | int result = old_index; |
| 76 | for (int i = 0; i < old_index; i++) { |
| 77 | if (signature->GetParam(i) == MachineRepresentation::kWord64) { |
| 78 | result++; |
| 79 | } |
| 80 | } |
| 81 | return result; |
| 82 | } |
| 83 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 84 | int Int64Lowering::GetParameterCountAfterLowering( |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 85 | Signature<MachineRepresentation>* signature) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 86 | // GetParameterIndexAfterLowering(parameter_count) returns the parameter count |
| 87 | // after lowering. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 88 | return GetParameterIndexAfterLowering( |
| 89 | signature, static_cast<int>(signature->parameter_count())); |
| 90 | } |
| 91 | |
| 92 | static int GetReturnCountAfterLowering( |
| 93 | Signature<MachineRepresentation>* signature) { |
| 94 | int result = static_cast<int>(signature->return_count()); |
| 95 | for (int i = 0; i < static_cast<int>(signature->return_count()); i++) { |
| 96 | if (signature->GetReturn(i) == MachineRepresentation::kWord64) { |
| 97 | result++; |
| 98 | } |
| 99 | } |
| 100 | return result; |
| 101 | } |
| 102 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 103 | void Int64Lowering::GetIndexNodes(Node* index, Node*& index_low, |
| 104 | Node*& index_high) { |
| 105 | #if defined(V8_TARGET_LITTLE_ENDIAN) |
| 106 | index_low = index; |
| 107 | index_high = graph()->NewNode(machine()->Int32Add(), index, |
| 108 | graph()->NewNode(common()->Int32Constant(4))); |
| 109 | #elif defined(V8_TARGET_BIG_ENDIAN) |
| 110 | index_low = graph()->NewNode(machine()->Int32Add(), index, |
| 111 | graph()->NewNode(common()->Int32Constant(4))); |
| 112 | index_high = index; |
| 113 | #endif |
| 114 | } |
| 115 | |
| 116 | #if defined(V8_TARGET_LITTLE_ENDIAN) |
| 117 | const int Int64Lowering::kLowerWordOffset = 0; |
| 118 | const int Int64Lowering::kHigherWordOffset = 4; |
| 119 | #elif defined(V8_TARGET_BIG_ENDIAN) |
| 120 | const int Int64Lowering::kLowerWordOffset = 4; |
| 121 | const int Int64Lowering::kHigherWordOffset = 0; |
| 122 | #endif |
| 123 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 124 | void Int64Lowering::LowerNode(Node* node) { |
| 125 | switch (node->opcode()) { |
| 126 | case IrOpcode::kInt64Constant: { |
| 127 | int64_t value = OpParameter<int64_t>(node); |
| 128 | Node* low_node = graph()->NewNode( |
| 129 | common()->Int32Constant(static_cast<int32_t>(value & 0xFFFFFFFF))); |
| 130 | Node* high_node = graph()->NewNode( |
| 131 | common()->Int32Constant(static_cast<int32_t>(value >> 32))); |
| 132 | ReplaceNode(node, low_node, high_node); |
| 133 | break; |
| 134 | } |
| 135 | case IrOpcode::kLoad: { |
| 136 | LoadRepresentation load_rep = LoadRepresentationOf(node->op()); |
| 137 | |
| 138 | if (load_rep.representation() == MachineRepresentation::kWord64) { |
| 139 | Node* base = node->InputAt(0); |
| 140 | Node* index = node->InputAt(1); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 141 | Node* index_low; |
| 142 | Node* index_high; |
| 143 | GetIndexNodes(index, index_low, index_high); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 144 | const Operator* load_op = machine()->Load(MachineType::Int32()); |
| 145 | Node* high_node; |
| 146 | if (node->InputCount() > 2) { |
| 147 | Node* effect_high = node->InputAt(2); |
| 148 | Node* control_high = node->InputAt(3); |
| 149 | high_node = graph()->NewNode(load_op, base, index_high, effect_high, |
| 150 | control_high); |
| 151 | // change the effect change from old_node --> old_effect to |
| 152 | // old_node --> high_node --> old_effect. |
| 153 | node->ReplaceInput(2, high_node); |
| 154 | } else { |
| 155 | high_node = graph()->NewNode(load_op, base, index_high); |
| 156 | } |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 157 | node->ReplaceInput(1, index_low); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 158 | NodeProperties::ChangeOp(node, load_op); |
| 159 | ReplaceNode(node, node, high_node); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 160 | } else { |
| 161 | DefaultLowering(node); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 162 | } |
| 163 | break; |
| 164 | } |
| 165 | case IrOpcode::kStore: { |
| 166 | StoreRepresentation store_rep = StoreRepresentationOf(node->op()); |
| 167 | if (store_rep.representation() == MachineRepresentation::kWord64) { |
| 168 | // We change the original store node to store the low word, and create |
| 169 | // a new store node to store the high word. The effect and control edges |
| 170 | // are copied from the original store to the new store node, the effect |
| 171 | // edge of the original store is redirected to the new store. |
| 172 | WriteBarrierKind write_barrier_kind = store_rep.write_barrier_kind(); |
| 173 | |
| 174 | Node* base = node->InputAt(0); |
| 175 | Node* index = node->InputAt(1); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 176 | Node* index_low; |
| 177 | Node* index_high; |
| 178 | GetIndexNodes(index, index_low, index_high); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 179 | Node* value = node->InputAt(2); |
| 180 | DCHECK(HasReplacementLow(value)); |
| 181 | DCHECK(HasReplacementHigh(value)); |
| 182 | |
| 183 | const Operator* store_op = machine()->Store(StoreRepresentation( |
| 184 | MachineRepresentation::kWord32, write_barrier_kind)); |
| 185 | |
| 186 | Node* high_node; |
| 187 | if (node->InputCount() > 3) { |
| 188 | Node* effect_high = node->InputAt(3); |
| 189 | Node* control_high = node->InputAt(4); |
| 190 | high_node = graph()->NewNode(store_op, base, index_high, |
| 191 | GetReplacementHigh(value), effect_high, |
| 192 | control_high); |
| 193 | node->ReplaceInput(3, high_node); |
| 194 | |
| 195 | } else { |
| 196 | high_node = graph()->NewNode(store_op, base, index_high, |
| 197 | GetReplacementHigh(value)); |
| 198 | } |
| 199 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 200 | node->ReplaceInput(1, index_low); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 201 | node->ReplaceInput(2, GetReplacementLow(value)); |
| 202 | NodeProperties::ChangeOp(node, store_op); |
| 203 | ReplaceNode(node, node, high_node); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 204 | } else { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 205 | if (HasReplacementLow(node->InputAt(2))) { |
| 206 | node->ReplaceInput(2, GetReplacementLow(node->InputAt(2))); |
| 207 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 208 | } |
| 209 | break; |
| 210 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 211 | case IrOpcode::kStart: { |
| 212 | int parameter_count = GetParameterCountAfterLowering(signature()); |
| 213 | // Only exchange the node if the parameter count actually changed. |
| 214 | if (parameter_count != signature()->parameter_count()) { |
| 215 | int delta = |
| 216 | parameter_count - static_cast<int>(signature()->parameter_count()); |
| 217 | int new_output_count = node->op()->ValueOutputCount() + delta; |
| 218 | NodeProperties::ChangeOp(node, common()->Start(new_output_count)); |
| 219 | } |
| 220 | break; |
| 221 | } |
| 222 | case IrOpcode::kParameter: { |
| 223 | DCHECK(node->InputCount() == 1); |
| 224 | // Only exchange the node if the parameter count actually changed. We do |
| 225 | // not even have to do the default lowering because the the start node, |
| 226 | // the only input of a parameter node, only changes if the parameter count |
| 227 | // changes. |
| 228 | if (GetParameterCountAfterLowering(signature()) != |
| 229 | signature()->parameter_count()) { |
| 230 | int old_index = ParameterIndexOf(node->op()); |
| 231 | int new_index = GetParameterIndexAfterLowering(signature(), old_index); |
| 232 | NodeProperties::ChangeOp(node, common()->Parameter(new_index)); |
| 233 | |
| 234 | Node* high_node = nullptr; |
| 235 | if (signature()->GetParam(old_index) == |
| 236 | MachineRepresentation::kWord64) { |
| 237 | high_node = graph()->NewNode(common()->Parameter(new_index + 1), |
| 238 | graph()->start()); |
| 239 | } |
| 240 | ReplaceNode(node, node, high_node); |
| 241 | } |
| 242 | break; |
| 243 | } |
| 244 | case IrOpcode::kReturn: { |
| 245 | DefaultLowering(node); |
| 246 | int new_return_count = GetReturnCountAfterLowering(signature()); |
| 247 | if (signature()->return_count() != new_return_count) { |
| 248 | NodeProperties::ChangeOp(node, common()->Return(new_return_count)); |
| 249 | } |
| 250 | break; |
| 251 | } |
| 252 | case IrOpcode::kCall: { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 253 | // TODO(turbofan): Make WASM code const-correct wrt. CallDescriptor. |
| 254 | CallDescriptor* descriptor = |
| 255 | const_cast<CallDescriptor*>(CallDescriptorOf(node->op())); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 256 | if (DefaultLowering(node) || |
| 257 | (descriptor->ReturnCount() == 1 && |
| 258 | descriptor->GetReturnType(0) == MachineType::Int64())) { |
| 259 | // We have to adjust the call descriptor. |
| 260 | const Operator* op = common()->Call( |
| 261 | wasm::ModuleEnv::GetI32WasmCallDescriptor(zone(), descriptor)); |
| 262 | NodeProperties::ChangeOp(node, op); |
| 263 | } |
| 264 | if (descriptor->ReturnCount() == 1 && |
| 265 | descriptor->GetReturnType(0) == MachineType::Int64()) { |
| 266 | // We access the additional return values through projections. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 267 | Node* low_node = |
| 268 | graph()->NewNode(common()->Projection(0), node, graph()->start()); |
| 269 | Node* high_node = |
| 270 | graph()->NewNode(common()->Projection(1), node, graph()->start()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 271 | ReplaceNode(node, low_node, high_node); |
| 272 | } |
| 273 | break; |
| 274 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 275 | case IrOpcode::kWord64And: { |
| 276 | DCHECK(node->InputCount() == 2); |
| 277 | Node* left = node->InputAt(0); |
| 278 | Node* right = node->InputAt(1); |
| 279 | |
| 280 | Node* low_node = |
| 281 | graph()->NewNode(machine()->Word32And(), GetReplacementLow(left), |
| 282 | GetReplacementLow(right)); |
| 283 | Node* high_node = |
| 284 | graph()->NewNode(machine()->Word32And(), GetReplacementHigh(left), |
| 285 | GetReplacementHigh(right)); |
| 286 | ReplaceNode(node, low_node, high_node); |
| 287 | break; |
| 288 | } |
| 289 | case IrOpcode::kTruncateInt64ToInt32: { |
| 290 | DCHECK(node->InputCount() == 1); |
| 291 | Node* input = node->InputAt(0); |
| 292 | ReplaceNode(node, GetReplacementLow(input), nullptr); |
| 293 | node->NullAllInputs(); |
| 294 | break; |
| 295 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 296 | case IrOpcode::kInt64Add: { |
| 297 | DCHECK(node->InputCount() == 2); |
| 298 | |
| 299 | Node* right = node->InputAt(1); |
| 300 | node->ReplaceInput(1, GetReplacementLow(right)); |
| 301 | node->AppendInput(zone(), GetReplacementHigh(right)); |
| 302 | |
| 303 | Node* left = node->InputAt(0); |
| 304 | node->ReplaceInput(0, GetReplacementLow(left)); |
| 305 | node->InsertInput(zone(), 1, GetReplacementHigh(left)); |
| 306 | |
| 307 | NodeProperties::ChangeOp(node, machine()->Int32PairAdd()); |
| 308 | // We access the additional return values through projections. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 309 | Node* low_node = |
| 310 | graph()->NewNode(common()->Projection(0), node, graph()->start()); |
| 311 | Node* high_node = |
| 312 | graph()->NewNode(common()->Projection(1), node, graph()->start()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 313 | ReplaceNode(node, low_node, high_node); |
| 314 | break; |
| 315 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 316 | case IrOpcode::kInt64Sub: { |
| 317 | DCHECK(node->InputCount() == 2); |
| 318 | |
| 319 | Node* right = node->InputAt(1); |
| 320 | node->ReplaceInput(1, GetReplacementLow(right)); |
| 321 | node->AppendInput(zone(), GetReplacementHigh(right)); |
| 322 | |
| 323 | Node* left = node->InputAt(0); |
| 324 | node->ReplaceInput(0, GetReplacementLow(left)); |
| 325 | node->InsertInput(zone(), 1, GetReplacementHigh(left)); |
| 326 | |
| 327 | NodeProperties::ChangeOp(node, machine()->Int32PairSub()); |
| 328 | // We access the additional return values through projections. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 329 | Node* low_node = |
| 330 | graph()->NewNode(common()->Projection(0), node, graph()->start()); |
| 331 | Node* high_node = |
| 332 | graph()->NewNode(common()->Projection(1), node, graph()->start()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 333 | ReplaceNode(node, low_node, high_node); |
| 334 | break; |
| 335 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 336 | case IrOpcode::kInt64Mul: { |
| 337 | DCHECK(node->InputCount() == 2); |
| 338 | |
| 339 | Node* right = node->InputAt(1); |
| 340 | node->ReplaceInput(1, GetReplacementLow(right)); |
| 341 | node->AppendInput(zone(), GetReplacementHigh(right)); |
| 342 | |
| 343 | Node* left = node->InputAt(0); |
| 344 | node->ReplaceInput(0, GetReplacementLow(left)); |
| 345 | node->InsertInput(zone(), 1, GetReplacementHigh(left)); |
| 346 | |
| 347 | NodeProperties::ChangeOp(node, machine()->Int32PairMul()); |
| 348 | // We access the additional return values through projections. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 349 | Node* low_node = |
| 350 | graph()->NewNode(common()->Projection(0), node, graph()->start()); |
| 351 | Node* high_node = |
| 352 | graph()->NewNode(common()->Projection(1), node, graph()->start()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 353 | ReplaceNode(node, low_node, high_node); |
| 354 | break; |
| 355 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 356 | case IrOpcode::kWord64Or: { |
| 357 | DCHECK(node->InputCount() == 2); |
| 358 | Node* left = node->InputAt(0); |
| 359 | Node* right = node->InputAt(1); |
| 360 | |
| 361 | Node* low_node = |
| 362 | graph()->NewNode(machine()->Word32Or(), GetReplacementLow(left), |
| 363 | GetReplacementLow(right)); |
| 364 | Node* high_node = |
| 365 | graph()->NewNode(machine()->Word32Or(), GetReplacementHigh(left), |
| 366 | GetReplacementHigh(right)); |
| 367 | ReplaceNode(node, low_node, high_node); |
| 368 | break; |
| 369 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 370 | case IrOpcode::kWord64Xor: { |
| 371 | DCHECK(node->InputCount() == 2); |
| 372 | Node* left = node->InputAt(0); |
| 373 | Node* right = node->InputAt(1); |
| 374 | |
| 375 | Node* low_node = |
| 376 | graph()->NewNode(machine()->Word32Xor(), GetReplacementLow(left), |
| 377 | GetReplacementLow(right)); |
| 378 | Node* high_node = |
| 379 | graph()->NewNode(machine()->Word32Xor(), GetReplacementHigh(left), |
| 380 | GetReplacementHigh(right)); |
| 381 | ReplaceNode(node, low_node, high_node); |
| 382 | break; |
| 383 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 384 | case IrOpcode::kWord64Shl: { |
| 385 | // TODO(turbofan): if the shift count >= 32, then we can set the low word |
| 386 | // of the output to 0 and just calculate the high word. |
| 387 | DCHECK(node->InputCount() == 2); |
| 388 | Node* shift = node->InputAt(1); |
| 389 | if (HasReplacementLow(shift)) { |
| 390 | // We do not have to care about the high word replacement, because |
| 391 | // the shift can only be between 0 and 63 anyways. |
| 392 | node->ReplaceInput(1, GetReplacementLow(shift)); |
| 393 | } |
| 394 | |
| 395 | Node* value = node->InputAt(0); |
| 396 | node->ReplaceInput(0, GetReplacementLow(value)); |
| 397 | node->InsertInput(zone(), 1, GetReplacementHigh(value)); |
| 398 | |
| 399 | NodeProperties::ChangeOp(node, machine()->Word32PairShl()); |
| 400 | // We access the additional return values through projections. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 401 | Node* low_node = |
| 402 | graph()->NewNode(common()->Projection(0), node, graph()->start()); |
| 403 | Node* high_node = |
| 404 | graph()->NewNode(common()->Projection(1), node, graph()->start()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 405 | ReplaceNode(node, low_node, high_node); |
| 406 | break; |
| 407 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 408 | case IrOpcode::kWord64Shr: { |
| 409 | // TODO(turbofan): if the shift count >= 32, then we can set the low word |
| 410 | // of the output to 0 and just calculate the high word. |
| 411 | DCHECK(node->InputCount() == 2); |
| 412 | Node* shift = node->InputAt(1); |
| 413 | if (HasReplacementLow(shift)) { |
| 414 | // We do not have to care about the high word replacement, because |
| 415 | // the shift can only be between 0 and 63 anyways. |
| 416 | node->ReplaceInput(1, GetReplacementLow(shift)); |
| 417 | } |
| 418 | |
| 419 | Node* value = node->InputAt(0); |
| 420 | node->ReplaceInput(0, GetReplacementLow(value)); |
| 421 | node->InsertInput(zone(), 1, GetReplacementHigh(value)); |
| 422 | |
| 423 | NodeProperties::ChangeOp(node, machine()->Word32PairShr()); |
| 424 | // We access the additional return values through projections. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 425 | Node* low_node = |
| 426 | graph()->NewNode(common()->Projection(0), node, graph()->start()); |
| 427 | Node* high_node = |
| 428 | graph()->NewNode(common()->Projection(1), node, graph()->start()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 429 | ReplaceNode(node, low_node, high_node); |
| 430 | break; |
| 431 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 432 | case IrOpcode::kWord64Sar: { |
| 433 | // TODO(turbofan): if the shift count >= 32, then we can set the low word |
| 434 | // of the output to 0 and just calculate the high word. |
| 435 | DCHECK(node->InputCount() == 2); |
| 436 | Node* shift = node->InputAt(1); |
| 437 | if (HasReplacementLow(shift)) { |
| 438 | // We do not have to care about the high word replacement, because |
| 439 | // the shift can only be between 0 and 63 anyways. |
| 440 | node->ReplaceInput(1, GetReplacementLow(shift)); |
| 441 | } |
| 442 | |
| 443 | Node* value = node->InputAt(0); |
| 444 | node->ReplaceInput(0, GetReplacementLow(value)); |
| 445 | node->InsertInput(zone(), 1, GetReplacementHigh(value)); |
| 446 | |
| 447 | NodeProperties::ChangeOp(node, machine()->Word32PairSar()); |
| 448 | // We access the additional return values through projections. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 449 | Node* low_node = |
| 450 | graph()->NewNode(common()->Projection(0), node, graph()->start()); |
| 451 | Node* high_node = |
| 452 | graph()->NewNode(common()->Projection(1), node, graph()->start()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 453 | ReplaceNode(node, low_node, high_node); |
| 454 | break; |
| 455 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 456 | case IrOpcode::kWord64Equal: { |
| 457 | DCHECK(node->InputCount() == 2); |
| 458 | Node* left = node->InputAt(0); |
| 459 | Node* right = node->InputAt(1); |
| 460 | |
| 461 | // TODO(wasm): Use explicit comparisons and && here? |
| 462 | Node* replacement = graph()->NewNode( |
| 463 | machine()->Word32Equal(), |
| 464 | graph()->NewNode( |
| 465 | machine()->Word32Or(), |
| 466 | graph()->NewNode(machine()->Word32Xor(), GetReplacementLow(left), |
| 467 | GetReplacementLow(right)), |
| 468 | graph()->NewNode(machine()->Word32Xor(), GetReplacementHigh(left), |
| 469 | GetReplacementHigh(right))), |
| 470 | graph()->NewNode(common()->Int32Constant(0))); |
| 471 | |
| 472 | ReplaceNode(node, replacement, nullptr); |
| 473 | break; |
| 474 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 475 | case IrOpcode::kInt64LessThan: { |
| 476 | LowerComparison(node, machine()->Int32LessThan(), |
| 477 | machine()->Uint32LessThan()); |
| 478 | break; |
| 479 | } |
| 480 | case IrOpcode::kInt64LessThanOrEqual: { |
| 481 | LowerComparison(node, machine()->Int32LessThan(), |
| 482 | machine()->Uint32LessThanOrEqual()); |
| 483 | break; |
| 484 | } |
| 485 | case IrOpcode::kUint64LessThan: { |
| 486 | LowerComparison(node, machine()->Uint32LessThan(), |
| 487 | machine()->Uint32LessThan()); |
| 488 | break; |
| 489 | } |
| 490 | case IrOpcode::kUint64LessThanOrEqual: { |
| 491 | LowerComparison(node, machine()->Uint32LessThan(), |
| 492 | machine()->Uint32LessThanOrEqual()); |
| 493 | break; |
| 494 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 495 | case IrOpcode::kChangeInt32ToInt64: { |
| 496 | DCHECK(node->InputCount() == 1); |
| 497 | Node* input = node->InputAt(0); |
| 498 | if (HasReplacementLow(input)) { |
| 499 | input = GetReplacementLow(input); |
| 500 | } |
| 501 | // We use SAR to preserve the sign in the high word. |
| 502 | ReplaceNode( |
| 503 | node, input, |
| 504 | graph()->NewNode(machine()->Word32Sar(), input, |
| 505 | graph()->NewNode(common()->Int32Constant(31)))); |
| 506 | node->NullAllInputs(); |
| 507 | break; |
| 508 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 509 | case IrOpcode::kChangeUint32ToUint64: { |
| 510 | DCHECK(node->InputCount() == 1); |
| 511 | Node* input = node->InputAt(0); |
| 512 | if (HasReplacementLow(input)) { |
| 513 | input = GetReplacementLow(input); |
| 514 | } |
| 515 | ReplaceNode(node, input, graph()->NewNode(common()->Int32Constant(0))); |
| 516 | node->NullAllInputs(); |
| 517 | break; |
| 518 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 519 | case IrOpcode::kBitcastInt64ToFloat64: { |
| 520 | DCHECK(node->InputCount() == 1); |
| 521 | Node* input = node->InputAt(0); |
| 522 | Node* stack_slot = graph()->NewNode( |
| 523 | machine()->StackSlot(MachineRepresentation::kWord64)); |
| 524 | |
| 525 | Node* store_high_word = graph()->NewNode( |
| 526 | machine()->Store( |
| 527 | StoreRepresentation(MachineRepresentation::kWord32, |
| 528 | WriteBarrierKind::kNoWriteBarrier)), |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 529 | stack_slot, |
| 530 | graph()->NewNode(common()->Int32Constant(kHigherWordOffset)), |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 531 | GetReplacementHigh(input), graph()->start(), graph()->start()); |
| 532 | |
| 533 | Node* store_low_word = graph()->NewNode( |
| 534 | machine()->Store( |
| 535 | StoreRepresentation(MachineRepresentation::kWord32, |
| 536 | WriteBarrierKind::kNoWriteBarrier)), |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 537 | stack_slot, |
| 538 | graph()->NewNode(common()->Int32Constant(kLowerWordOffset)), |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 539 | GetReplacementLow(input), store_high_word, graph()->start()); |
| 540 | |
| 541 | Node* load = |
| 542 | graph()->NewNode(machine()->Load(MachineType::Float64()), stack_slot, |
| 543 | graph()->NewNode(common()->Int32Constant(0)), |
| 544 | store_low_word, graph()->start()); |
| 545 | |
| 546 | ReplaceNode(node, load, nullptr); |
| 547 | break; |
| 548 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 549 | case IrOpcode::kBitcastFloat64ToInt64: { |
| 550 | DCHECK(node->InputCount() == 1); |
| 551 | Node* input = node->InputAt(0); |
| 552 | if (HasReplacementLow(input)) { |
| 553 | input = GetReplacementLow(input); |
| 554 | } |
| 555 | Node* stack_slot = graph()->NewNode( |
| 556 | machine()->StackSlot(MachineRepresentation::kWord64)); |
| 557 | Node* store = graph()->NewNode( |
| 558 | machine()->Store( |
| 559 | StoreRepresentation(MachineRepresentation::kFloat64, |
| 560 | WriteBarrierKind::kNoWriteBarrier)), |
| 561 | stack_slot, graph()->NewNode(common()->Int32Constant(0)), input, |
| 562 | graph()->start(), graph()->start()); |
| 563 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 564 | Node* high_node = graph()->NewNode( |
| 565 | machine()->Load(MachineType::Int32()), stack_slot, |
| 566 | graph()->NewNode(common()->Int32Constant(kHigherWordOffset)), store, |
| 567 | graph()->start()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 568 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 569 | Node* low_node = graph()->NewNode( |
| 570 | machine()->Load(MachineType::Int32()), stack_slot, |
| 571 | graph()->NewNode(common()->Int32Constant(kLowerWordOffset)), store, |
| 572 | graph()->start()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 573 | ReplaceNode(node, low_node, high_node); |
| 574 | break; |
| 575 | } |
| 576 | case IrOpcode::kWord64Ror: { |
| 577 | DCHECK(node->InputCount() == 2); |
| 578 | Node* input = node->InputAt(0); |
| 579 | Node* shift = HasReplacementLow(node->InputAt(1)) |
| 580 | ? GetReplacementLow(node->InputAt(1)) |
| 581 | : node->InputAt(1); |
| 582 | Int32Matcher m(shift); |
| 583 | if (m.HasValue()) { |
| 584 | // Precondition: 0 <= shift < 64. |
| 585 | int32_t shift_value = m.Value() & 0x3f; |
| 586 | if (shift_value == 0) { |
| 587 | ReplaceNode(node, GetReplacementLow(input), |
| 588 | GetReplacementHigh(input)); |
| 589 | } else if (shift_value == 32) { |
| 590 | ReplaceNode(node, GetReplacementHigh(input), |
| 591 | GetReplacementLow(input)); |
| 592 | } else { |
| 593 | Node* low_input; |
| 594 | Node* high_input; |
| 595 | if (shift_value < 32) { |
| 596 | low_input = GetReplacementLow(input); |
| 597 | high_input = GetReplacementHigh(input); |
| 598 | } else { |
| 599 | low_input = GetReplacementHigh(input); |
| 600 | high_input = GetReplacementLow(input); |
| 601 | } |
| 602 | int32_t masked_shift_value = shift_value & 0x1f; |
| 603 | Node* masked_shift = |
| 604 | graph()->NewNode(common()->Int32Constant(masked_shift_value)); |
| 605 | Node* inv_shift = graph()->NewNode( |
| 606 | common()->Int32Constant(32 - masked_shift_value)); |
| 607 | |
| 608 | Node* low_node = graph()->NewNode( |
| 609 | machine()->Word32Or(), |
| 610 | graph()->NewNode(machine()->Word32Shr(), low_input, masked_shift), |
| 611 | graph()->NewNode(machine()->Word32Shl(), high_input, inv_shift)); |
| 612 | Node* high_node = graph()->NewNode( |
| 613 | machine()->Word32Or(), graph()->NewNode(machine()->Word32Shr(), |
| 614 | high_input, masked_shift), |
| 615 | graph()->NewNode(machine()->Word32Shl(), low_input, inv_shift)); |
| 616 | ReplaceNode(node, low_node, high_node); |
| 617 | } |
| 618 | } else { |
| 619 | Node* safe_shift = shift; |
| 620 | if (!machine()->Word32ShiftIsSafe()) { |
| 621 | safe_shift = |
| 622 | graph()->NewNode(machine()->Word32And(), shift, |
| 623 | graph()->NewNode(common()->Int32Constant(0x1f))); |
| 624 | } |
| 625 | |
| 626 | // By creating this bit-mask with SAR and SHL we do not have to deal |
| 627 | // with shift == 0 as a special case. |
| 628 | Node* inv_mask = graph()->NewNode( |
| 629 | machine()->Word32Shl(), |
| 630 | graph()->NewNode(machine()->Word32Sar(), |
| 631 | graph()->NewNode(common()->Int32Constant( |
| 632 | std::numeric_limits<int32_t>::min())), |
| 633 | safe_shift), |
| 634 | graph()->NewNode(common()->Int32Constant(1))); |
| 635 | |
| 636 | Node* bit_mask = |
| 637 | graph()->NewNode(machine()->Word32Xor(), inv_mask, |
| 638 | graph()->NewNode(common()->Int32Constant(-1))); |
| 639 | |
| 640 | // We have to mask the shift value for this comparison. If |
| 641 | // !machine()->Word32ShiftIsSafe() then the masking should already be |
| 642 | // part of the graph. |
| 643 | Node* masked_shift6 = shift; |
| 644 | if (machine()->Word32ShiftIsSafe()) { |
| 645 | masked_shift6 = |
| 646 | graph()->NewNode(machine()->Word32And(), shift, |
| 647 | graph()->NewNode(common()->Int32Constant(0x3f))); |
| 648 | } |
| 649 | |
| 650 | Diamond lt32( |
| 651 | graph(), common(), |
| 652 | graph()->NewNode(machine()->Int32LessThan(), masked_shift6, |
| 653 | graph()->NewNode(common()->Int32Constant(32)))); |
| 654 | |
| 655 | // The low word and the high word can be swapped either at the input or |
| 656 | // at the output. We swap the inputs so that shift does not have to be |
| 657 | // kept for so long in a register. |
| 658 | Node* input_low = |
| 659 | lt32.Phi(MachineRepresentation::kWord32, GetReplacementLow(input), |
| 660 | GetReplacementHigh(input)); |
| 661 | Node* input_high = |
| 662 | lt32.Phi(MachineRepresentation::kWord32, GetReplacementHigh(input), |
| 663 | GetReplacementLow(input)); |
| 664 | |
| 665 | Node* rotate_low = |
| 666 | graph()->NewNode(machine()->Word32Ror(), input_low, safe_shift); |
| 667 | Node* rotate_high = |
| 668 | graph()->NewNode(machine()->Word32Ror(), input_high, safe_shift); |
| 669 | |
| 670 | Node* low_node = graph()->NewNode( |
| 671 | machine()->Word32Or(), |
| 672 | graph()->NewNode(machine()->Word32And(), rotate_low, bit_mask), |
| 673 | graph()->NewNode(machine()->Word32And(), rotate_high, inv_mask)); |
| 674 | |
| 675 | Node* high_node = graph()->NewNode( |
| 676 | machine()->Word32Or(), |
| 677 | graph()->NewNode(machine()->Word32And(), rotate_high, bit_mask), |
| 678 | graph()->NewNode(machine()->Word32And(), rotate_low, inv_mask)); |
| 679 | |
| 680 | ReplaceNode(node, low_node, high_node); |
| 681 | } |
| 682 | break; |
| 683 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 684 | case IrOpcode::kWord64Clz: { |
| 685 | DCHECK(node->InputCount() == 1); |
| 686 | Node* input = node->InputAt(0); |
| 687 | Diamond d( |
| 688 | graph(), common(), |
| 689 | graph()->NewNode(machine()->Word32Equal(), GetReplacementHigh(input), |
| 690 | graph()->NewNode(common()->Int32Constant(0)))); |
| 691 | |
| 692 | Node* low_node = d.Phi( |
| 693 | MachineRepresentation::kWord32, |
| 694 | graph()->NewNode(machine()->Int32Add(), |
| 695 | graph()->NewNode(machine()->Word32Clz(), |
| 696 | GetReplacementLow(input)), |
| 697 | graph()->NewNode(common()->Int32Constant(32))), |
| 698 | graph()->NewNode(machine()->Word32Clz(), GetReplacementHigh(input))); |
| 699 | ReplaceNode(node, low_node, graph()->NewNode(common()->Int32Constant(0))); |
| 700 | break; |
| 701 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 702 | case IrOpcode::kWord64Ctz: { |
| 703 | DCHECK(node->InputCount() == 1); |
| 704 | DCHECK(machine()->Word32Ctz().IsSupported()); |
| 705 | Node* input = node->InputAt(0); |
| 706 | Diamond d( |
| 707 | graph(), common(), |
| 708 | graph()->NewNode(machine()->Word32Equal(), GetReplacementLow(input), |
| 709 | graph()->NewNode(common()->Int32Constant(0)))); |
| 710 | Node* low_node = |
| 711 | d.Phi(MachineRepresentation::kWord32, |
| 712 | graph()->NewNode(machine()->Int32Add(), |
| 713 | graph()->NewNode(machine()->Word32Ctz().op(), |
| 714 | GetReplacementHigh(input)), |
| 715 | graph()->NewNode(common()->Int32Constant(32))), |
| 716 | graph()->NewNode(machine()->Word32Ctz().op(), |
| 717 | GetReplacementLow(input))); |
| 718 | ReplaceNode(node, low_node, graph()->NewNode(common()->Int32Constant(0))); |
| 719 | break; |
| 720 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 721 | case IrOpcode::kWord64Popcnt: { |
| 722 | DCHECK(node->InputCount() == 1); |
| 723 | Node* input = node->InputAt(0); |
| 724 | // We assume that a Word64Popcnt node only has been created if |
| 725 | // Word32Popcnt is actually supported. |
| 726 | DCHECK(machine()->Word32Popcnt().IsSupported()); |
| 727 | ReplaceNode(node, graph()->NewNode( |
| 728 | machine()->Int32Add(), |
| 729 | graph()->NewNode(machine()->Word32Popcnt().op(), |
| 730 | GetReplacementLow(input)), |
| 731 | graph()->NewNode(machine()->Word32Popcnt().op(), |
| 732 | GetReplacementHigh(input))), |
| 733 | graph()->NewNode(common()->Int32Constant(0))); |
| 734 | break; |
| 735 | } |
| 736 | case IrOpcode::kPhi: { |
| 737 | MachineRepresentation rep = PhiRepresentationOf(node->op()); |
| 738 | if (rep == MachineRepresentation::kWord64) { |
| 739 | // The replacement nodes have already been created, we only have to |
| 740 | // replace placeholder nodes. |
| 741 | Node* low_node = GetReplacementLow(node); |
| 742 | Node* high_node = GetReplacementHigh(node); |
| 743 | for (int i = 0; i < node->op()->ValueInputCount(); i++) { |
| 744 | low_node->ReplaceInput(i, GetReplacementLow(node->InputAt(i))); |
| 745 | high_node->ReplaceInput(i, GetReplacementHigh(node->InputAt(i))); |
| 746 | } |
| 747 | } else { |
| 748 | DefaultLowering(node); |
| 749 | } |
| 750 | break; |
| 751 | } |
| 752 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 753 | default: { DefaultLowering(node); } |
| 754 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 755 | } // NOLINT(readability/fn_size) |
| 756 | |
| 757 | void Int64Lowering::LowerComparison(Node* node, const Operator* high_word_op, |
| 758 | const Operator* low_word_op) { |
| 759 | DCHECK(node->InputCount() == 2); |
| 760 | Node* left = node->InputAt(0); |
| 761 | Node* right = node->InputAt(1); |
| 762 | Node* replacement = graph()->NewNode( |
| 763 | machine()->Word32Or(), |
| 764 | graph()->NewNode(high_word_op, GetReplacementHigh(left), |
| 765 | GetReplacementHigh(right)), |
| 766 | graph()->NewNode( |
| 767 | machine()->Word32And(), |
| 768 | graph()->NewNode(machine()->Word32Equal(), GetReplacementHigh(left), |
| 769 | GetReplacementHigh(right)), |
| 770 | graph()->NewNode(low_word_op, GetReplacementLow(left), |
| 771 | GetReplacementLow(right)))); |
| 772 | |
| 773 | ReplaceNode(node, replacement, nullptr); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 774 | } |
| 775 | |
| 776 | bool Int64Lowering::DefaultLowering(Node* node) { |
| 777 | bool something_changed = false; |
| 778 | for (int i = NodeProperties::PastValueIndex(node) - 1; i >= 0; i--) { |
| 779 | Node* input = node->InputAt(i); |
| 780 | if (HasReplacementLow(input)) { |
| 781 | something_changed = true; |
| 782 | node->ReplaceInput(i, GetReplacementLow(input)); |
| 783 | } |
| 784 | if (HasReplacementHigh(input)) { |
| 785 | something_changed = true; |
| 786 | node->InsertInput(zone(), i + 1, GetReplacementHigh(input)); |
| 787 | } |
| 788 | } |
| 789 | return something_changed; |
| 790 | } |
| 791 | |
| 792 | void Int64Lowering::ReplaceNode(Node* old, Node* new_low, Node* new_high) { |
| 793 | // if new_low == nullptr, then also new_high == nullptr. |
| 794 | DCHECK(new_low != nullptr || new_high == nullptr); |
| 795 | replacements_[old->id()].low = new_low; |
| 796 | replacements_[old->id()].high = new_high; |
| 797 | } |
| 798 | |
| 799 | bool Int64Lowering::HasReplacementLow(Node* node) { |
| 800 | return replacements_[node->id()].low != nullptr; |
| 801 | } |
| 802 | |
| 803 | Node* Int64Lowering::GetReplacementLow(Node* node) { |
| 804 | Node* result = replacements_[node->id()].low; |
| 805 | DCHECK(result); |
| 806 | return result; |
| 807 | } |
| 808 | |
| 809 | bool Int64Lowering::HasReplacementHigh(Node* node) { |
| 810 | return replacements_[node->id()].high != nullptr; |
| 811 | } |
| 812 | |
| 813 | Node* Int64Lowering::GetReplacementHigh(Node* node) { |
| 814 | Node* result = replacements_[node->id()].high; |
| 815 | DCHECK(result); |
| 816 | return result; |
| 817 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 818 | |
| 819 | void Int64Lowering::PreparePhiReplacement(Node* phi) { |
| 820 | MachineRepresentation rep = PhiRepresentationOf(phi->op()); |
| 821 | if (rep == MachineRepresentation::kWord64) { |
| 822 | // We have to create the replacements for a phi node before we actually |
| 823 | // lower the phi to break potential cycles in the graph. The replacements of |
| 824 | // input nodes do not exist yet, so we use a placeholder node to pass the |
| 825 | // graph verifier. |
| 826 | int value_count = phi->op()->ValueInputCount(); |
| 827 | Node** inputs_low = zone()->NewArray<Node*>(value_count + 1); |
| 828 | Node** inputs_high = zone()->NewArray<Node*>(value_count + 1); |
| 829 | for (int i = 0; i < value_count; i++) { |
| 830 | inputs_low[i] = placeholder_; |
| 831 | inputs_high[i] = placeholder_; |
| 832 | } |
| 833 | inputs_low[value_count] = NodeProperties::GetControlInput(phi, 0); |
| 834 | inputs_high[value_count] = NodeProperties::GetControlInput(phi, 0); |
| 835 | ReplaceNode(phi, |
| 836 | graph()->NewNode( |
| 837 | common()->Phi(MachineRepresentation::kWord32, value_count), |
| 838 | value_count + 1, inputs_low, false), |
| 839 | graph()->NewNode( |
| 840 | common()->Phi(MachineRepresentation::kWord32, value_count), |
| 841 | value_count + 1, inputs_high, false)); |
| 842 | } |
| 843 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 844 | } // namespace compiler |
| 845 | } // namespace internal |
| 846 | } // namespace v8 |