// Copyright 2014 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/select-lowering.h"
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#include "src/compiler/common-operator.h"
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#include "src/compiler/diamond.h"
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#include "src/compiler/graph.h"
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#include "src/compiler/node.h"
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#include "src/compiler/node-properties.h"
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namespace v8 {
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namespace internal {
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namespace compiler {
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SelectLowering::SelectLowering(Graph* graph, CommonOperatorBuilder* common)
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: common_(common), graph_(graph) {}
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SelectLowering::~SelectLowering() {}
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Reduction SelectLowering::Reduce(Node* node) {
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if (node->opcode() != IrOpcode::kSelect) return NoChange();
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SelectParameters const p = SelectParametersOf(node->op());
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Node* cond = node->InputAt(0);
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Node* vthen = node->InputAt(1);
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Node* velse = node->InputAt(2);
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// Create a diamond and a phi.
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Diamond d(graph(), common(), cond, p.hint());
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node->ReplaceInput(0, vthen);
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node->ReplaceInput(1, velse);
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node->ReplaceInput(2, d.merge);
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NodeProperties::ChangeOp(node, common()->Phi(p.representation(), 2));
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return Changed(node);
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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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