// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/compiler/node-matchers.h"
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namespace v8 {
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namespace internal {
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namespace compiler {
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bool NodeMatcher::IsComparison() const {
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return IrOpcode::IsComparisonOpcode(opcode());
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}
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BranchMatcher::BranchMatcher(Node* branch)
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: NodeMatcher(branch), if_true_(nullptr), if_false_(nullptr) {
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if (branch->opcode() != IrOpcode::kBranch) return;
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for (Node* use : branch->uses()) {
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if (use->opcode() == IrOpcode::kIfTrue) {
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DCHECK_NULL(if_true_);
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if_true_ = use;
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} else if (use->opcode() == IrOpcode::kIfFalse) {
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DCHECK_NULL(if_false_);
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if_false_ = use;
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}
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}
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}
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DiamondMatcher::DiamondMatcher(Node* merge)
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: NodeMatcher(merge),
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branch_(nullptr),
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if_true_(nullptr),
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if_false_(nullptr) {
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if (merge->InputCount() != 2) return;
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if (merge->opcode() != IrOpcode::kMerge) return;
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Node* input0 = merge->InputAt(0);
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if (input0->InputCount() != 1) return;
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Node* input1 = merge->InputAt(1);
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if (input1->InputCount() != 1) return;
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Node* branch = input0->InputAt(0);
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if (branch != input1->InputAt(0)) return;
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if (branch->opcode() != IrOpcode::kBranch) return;
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if (input0->opcode() == IrOpcode::kIfTrue &&
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input1->opcode() == IrOpcode::kIfFalse) {
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branch_ = branch;
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if_true_ = input0;
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if_false_ = input1;
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} else if (input0->opcode() == IrOpcode::kIfFalse &&
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input1->opcode() == IrOpcode::kIfTrue) {
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branch_ = branch;
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if_true_ = input1;
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if_false_ = input0;
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}
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}
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} // namespace compiler
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} // namespace internal
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} // namespace v8
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