Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 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/node-matchers.h" |
| 6 | |
| 7 | namespace v8 { |
| 8 | namespace internal { |
| 9 | namespace compiler { |
| 10 | |
| 11 | bool NodeMatcher::IsComparison() const { |
| 12 | return IrOpcode::IsComparisonOpcode(opcode()); |
| 13 | } |
| 14 | |
| 15 | |
| 16 | BranchMatcher::BranchMatcher(Node* branch) |
| 17 | : NodeMatcher(branch), if_true_(nullptr), if_false_(nullptr) { |
| 18 | if (branch->opcode() != IrOpcode::kBranch) return; |
| 19 | for (Node* use : branch->uses()) { |
| 20 | if (use->opcode() == IrOpcode::kIfTrue) { |
| 21 | DCHECK_NULL(if_true_); |
| 22 | if_true_ = use; |
| 23 | } else if (use->opcode() == IrOpcode::kIfFalse) { |
| 24 | DCHECK_NULL(if_false_); |
| 25 | if_false_ = use; |
| 26 | } |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | |
| 31 | DiamondMatcher::DiamondMatcher(Node* merge) |
| 32 | : NodeMatcher(merge), |
| 33 | branch_(nullptr), |
| 34 | if_true_(nullptr), |
| 35 | if_false_(nullptr) { |
| 36 | if (merge->InputCount() != 2) return; |
| 37 | if (merge->opcode() != IrOpcode::kMerge) return; |
| 38 | Node* input0 = merge->InputAt(0); |
| 39 | if (input0->InputCount() != 1) return; |
| 40 | Node* input1 = merge->InputAt(1); |
| 41 | if (input1->InputCount() != 1) return; |
| 42 | Node* branch = input0->InputAt(0); |
| 43 | if (branch != input1->InputAt(0)) return; |
| 44 | if (branch->opcode() != IrOpcode::kBranch) return; |
| 45 | if (input0->opcode() == IrOpcode::kIfTrue && |
| 46 | input1->opcode() == IrOpcode::kIfFalse) { |
| 47 | branch_ = branch; |
| 48 | if_true_ = input0; |
| 49 | if_false_ = input1; |
| 50 | } else if (input0->opcode() == IrOpcode::kIfFalse && |
| 51 | input1->opcode() == IrOpcode::kIfTrue) { |
| 52 | branch_ = branch; |
| 53 | if_true_ = input1; |
| 54 | if_false_ = input0; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | } // namespace compiler |
| 59 | } // namespace internal |
| 60 | } // namespace v8 |