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-assembler.h"
10#include "src/compiler/graph.h"
11#include "src/compiler/node-properties.h"
12#include "src/compiler/node.h"
13
14namespace v8 {
15namespace internal {
16namespace compiler {
17
18SelectLowering::SelectLowering(JSGraphAssembler* graph_assembler, Graph* graph)
19    : graph_assembler_(graph_assembler), start_(graph->start()) {}
20
21SelectLowering::~SelectLowering() = default;
22
23Reduction SelectLowering::Reduce(Node* node) {
24  if (node->opcode() != IrOpcode::kSelect) return NoChange();
25  return LowerSelect(node);
26}
27
28#define __ gasm()->
29
30Reduction SelectLowering::LowerSelect(Node* node) {
31  SelectParameters const p = SelectParametersOf(node->op());
32
33  Node* condition = node->InputAt(0);
34  Node* vtrue = node->InputAt(1);
35  Node* vfalse = node->InputAt(2);
36
37  bool reset_gasm = false;
38  if (gasm()->control() == nullptr) {
39    gasm()->InitializeEffectControl(start(), start());
40    reset_gasm = true;
41  }
42
43  auto done = __ MakeLabel(p.representation());
44
45  __ GotoIf(condition, &done, vtrue);
46  __ Goto(&done, vfalse);
47  __ Bind(&done);
48
49  if (reset_gasm) {
50    gasm()->Reset();
51  }
52
53  return Changed(done.PhiAt(0));
54}
55
56#undef __
57
58}  // namespace compiler
59}  // namespace internal
60}  // namespace v8
61