Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [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/common-operator-reducer.h" |
| 6 | |
| 7 | #include "src/compiler/common-operator.h" |
| 8 | |
| 9 | namespace v8 { |
| 10 | namespace internal { |
| 11 | namespace compiler { |
| 12 | |
| 13 | Reduction CommonOperatorReducer::Reduce(Node* node) { |
| 14 | switch (node->opcode()) { |
| 15 | case IrOpcode::kEffectPhi: |
| 16 | case IrOpcode::kPhi: { |
| 17 | int const input_count = node->InputCount(); |
| 18 | if (input_count > 1) { |
| 19 | Node* const replacement = node->InputAt(0); |
| 20 | for (int i = 1; i < input_count - 1; ++i) { |
| 21 | if (node->InputAt(i) != replacement) return NoChange(); |
| 22 | } |
| 23 | return Replace(replacement); |
| 24 | } |
| 25 | break; |
| 26 | } |
| 27 | case IrOpcode::kSelect: { |
| 28 | if (node->InputAt(1) == node->InputAt(2)) { |
| 29 | return Replace(node->InputAt(1)); |
| 30 | } |
| 31 | break; |
| 32 | } |
| 33 | default: |
| 34 | break; |
| 35 | } |
| 36 | return NoChange(); |
| 37 | } |
| 38 | |
| 39 | } // namespace compiler |
| 40 | } // namespace internal |
| 41 | } // namespace v8 |