| // Copyright 2014 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/compiler/common-operator-reducer.h" |
| |
| #include "src/compiler/common-operator.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace compiler { |
| |
| Reduction CommonOperatorReducer::Reduce(Node* node) { |
| switch (node->opcode()) { |
| case IrOpcode::kEffectPhi: |
| case IrOpcode::kPhi: { |
| int const input_count = node->InputCount(); |
| if (input_count > 1) { |
| Node* const replacement = node->InputAt(0); |
| for (int i = 1; i < input_count - 1; ++i) { |
| if (node->InputAt(i) != replacement) return NoChange(); |
| } |
| return Replace(replacement); |
| } |
| break; |
| } |
| case IrOpcode::kSelect: { |
| if (node->InputAt(1) == node->InputAt(2)) { |
| return Replace(node->InputAt(1)); |
| } |
| break; |
| } |
| default: |
| break; |
| } |
| return NoChange(); |
| } |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |