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Issue 1193833002: [turbofan] Proper dead code elimination as regular reducer. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@master
Patch Set: Renamed DeadControl to Dead. Created 5 years, 6 months ago
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1 // Copyright 2014 the V8 project authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "src/compiler/verifier.h" 5 #include "src/compiler/verifier.h"
6 6
7 #include <algorithm> 7 #include <algorithm>
8 #include <deque> 8 #include <deque>
9 #include <queue> 9 #include <queue>
10 #include <sstream> 10 #include <sstream>
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185 CheckUpperIs(node, Type::Internal()); 185 CheckUpperIs(node, Type::Internal());
186 break; 186 break;
187 case IrOpcode::kEnd: 187 case IrOpcode::kEnd:
188 // End has no outputs. 188 // End has no outputs.
189 CHECK(node->op()->ValueOutputCount() == 0); 189 CHECK(node->op()->ValueOutputCount() == 0);
190 CHECK(node->op()->EffectOutputCount() == 0); 190 CHECK(node->op()->EffectOutputCount() == 0);
191 CHECK(node->op()->ControlOutputCount() == 0); 191 CHECK(node->op()->ControlOutputCount() == 0);
192 // Type is empty. 192 // Type is empty.
193 CheckNotTyped(node); 193 CheckNotTyped(node);
194 break; 194 break;
195 case IrOpcode::kDeadValue: 195 case IrOpcode::kDead:
196 case IrOpcode::kDeadEffect:
197 case IrOpcode::kDeadControl:
198 // Dead is never connected to the graph. 196 // Dead is never connected to the graph.
199 // TODO(mstarzinger): Make the GraphReducer immediately perform control 197 // TODO(mstarzinger): Make the GraphReducer immediately perform control
200 // reduction in case control is killed. This will prevent {Dead} from 198 // reduction in case control is killed. This will prevent {Dead} from
201 // being reachable after a phase finished. Then re-enable below assert. 199 // being reachable after a phase finished. Then re-enable below assert.
202 // UNREACHABLE(); 200 // UNREACHABLE();
203 break; 201 break;
204 case IrOpcode::kBranch: { 202 case IrOpcode::kBranch: {
205 // Branch uses are IfTrue and IfFalse. 203 // Branch uses are IfTrue and IfFalse.
206 int count_true = 0, count_false = 0; 204 int count_true = 0, count_false = 0;
207 for (auto use : node->uses()) { 205 for (auto use : node->uses()) {
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1133 // Check inputs for all nodes in the block. 1131 // Check inputs for all nodes in the block.
1134 for (size_t i = 0; i < block->NodeCount(); i++) { 1132 for (size_t i = 0; i < block->NodeCount(); i++) {
1135 Node* node = block->NodeAt(i); 1133 Node* node = block->NodeAt(i);
1136 CheckInputsDominate(schedule, block, node, static_cast<int>(i) - 1); 1134 CheckInputsDominate(schedule, block, node, static_cast<int>(i) - 1);
1137 } 1135 }
1138 } 1136 }
1139 } 1137 }
1140 } // namespace compiler 1138 } // namespace compiler
1141 } // namespace internal 1139 } // namespace internal
1142 } // namespace v8 1140 } // namespace v8
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