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// Copyright 2015 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/node-matchers.h"
namespace v8 {
namespace internal {
namespace compiler {
bool NodeMatcher::IsComparison() const {
return IrOpcode::IsComparisonOpcode(opcode());
}
BranchMatcher::BranchMatcher(Node* branch)
: NodeMatcher(branch), if_true_(nullptr), if_false_(nullptr) {
if (branch->opcode() != IrOpcode::kBranch) return;
for (Node* use : branch->uses()) {
if (use->opcode() == IrOpcode::kIfTrue) {
DCHECK_NULL(if_true_);
if_true_ = use;
} else if (use->opcode() == IrOpcode::kIfFalse) {
DCHECK_NULL(if_false_);
if_false_ = use;
}
}
}
DiamondMatcher::DiamondMatcher(Node* merge)
: NodeMatcher(merge),
branch_(nullptr),
if_true_(nullptr),
if_false_(nullptr) {
if (merge->InputCount() != 2) return;
if (merge->opcode() != IrOpcode::kMerge) return;
Node* input0 = merge->InputAt(0);
if (input0->InputCount() != 1) return;
Node* input1 = merge->InputAt(1);
if (input1->InputCount() != 1) return;
Node* branch = input0->InputAt(0);
if (branch != input1->InputAt(0)) return;
if (branch->opcode() != IrOpcode::kBranch) return;
if (input0->opcode() == IrOpcode::kIfTrue &&
input1->opcode() == IrOpcode::kIfFalse) {
branch_ = branch;
if_true_ = input0;
if_false_ = input1;
} else if (input0->opcode() == IrOpcode::kIfFalse &&
input1->opcode() == IrOpcode::kIfTrue) {
branch_ = branch;
if_true_ = input1;
if_false_ = input0;
}
}
} // namespace compiler
} // namespace internal
} // namespace v8
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