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/select-lowering.h"
6
7#include "src/compiler/common-operator.h"
8#include "src/compiler/diamond.h"
9#include "src/compiler/graph.h"
10#include "src/compiler/node.h"
11#include "src/compiler/node-properties.h"
12
13namespace v8 {
14namespace internal {
15namespace compiler {
16
17SelectLowering::SelectLowering(Graph* graph, CommonOperatorBuilder* common)
18    : common_(common), graph_(graph) {}
19
20SelectLowering::~SelectLowering() {}
21
22
23Reduction SelectLowering::Reduce(Node* node) {
24  if (node->opcode() != IrOpcode::kSelect) return NoChange();
25  SelectParameters const p = SelectParametersOf(node->op());
26
27  Node* cond = node->InputAt(0);
28  Node* vthen = node->InputAt(1);
29  Node* velse = node->InputAt(2);
30
31  // Create a diamond and a phi.
32  Diamond d(graph(), common(), cond, p.hint());
33  node->ReplaceInput(0, vthen);
34  node->ReplaceInput(1, velse);
35  node->ReplaceInput(2, d.merge);
36  NodeProperties::ChangeOp(node, common()->Phi(p.representation(), 2));
37  return Changed(node);
38}
39
40}  // namespace compiler
41}  // namespace internal
42}  // namespace v8
43