1// Copyright 2016 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#ifndef V8_COMPILER_SIMD_SCALAR_LOWERING_H_
6#define V8_COMPILER_SIMD_SCALAR_LOWERING_H_
7
8#include "src/compiler/common-operator.h"
9#include "src/compiler/graph.h"
10#include "src/compiler/machine-operator.h"
11#include "src/compiler/node-marker.h"
12#include "src/zone/zone-containers.h"
13
14namespace v8 {
15namespace internal {
16namespace compiler {
17
18class SimdScalarLowering {
19 public:
20  SimdScalarLowering(Graph* graph, MachineOperatorBuilder* machine,
21                     CommonOperatorBuilder* common, Zone* zone,
22                     Signature<MachineRepresentation>* signature);
23
24  void LowerGraph();
25
26  int GetParameterCountAfterLowering();
27
28 private:
29  enum class State : uint8_t { kUnvisited, kOnStack, kVisited };
30
31  enum class SimdType : uint8_t { kInt32, kFloat32 };
32
33  static const int kMaxLanes = 4;
34  static const int kLaneWidth = 16 / kMaxLanes;
35
36  struct Replacement {
37    Node* node[kMaxLanes];
38    SimdType type;  // represents what input type is expected
39  };
40
41  Zone* zone() const { return zone_; }
42  Graph* graph() const { return graph_; }
43  MachineOperatorBuilder* machine() const { return machine_; }
44  CommonOperatorBuilder* common() const { return common_; }
45  Signature<MachineRepresentation>* signature() const { return signature_; }
46
47  void LowerNode(Node* node);
48  bool DefaultLowering(Node* node);
49
50  void ReplaceNode(Node* old, Node** new_nodes);
51  bool HasReplacement(size_t index, Node* node);
52  Node** GetReplacements(Node* node);
53  Node** GetReplacementsWithType(Node* node, SimdType type);
54  SimdType ReplacementType(Node* node);
55  void PreparePhiReplacement(Node* phi);
56  void SetLoweredType(Node* node, Node* output);
57  void GetIndexNodes(Node* index, Node** new_indices);
58  void LowerLoadOp(MachineRepresentation rep, Node* node,
59                   const Operator* load_op);
60  void LowerStoreOp(MachineRepresentation rep, Node* node,
61                    const Operator* store_op, SimdType rep_type);
62  void LowerBinaryOp(Node* node, SimdType rep_type, const Operator* op);
63
64  struct NodeState {
65    Node* node;
66    int input_index;
67  };
68
69  Zone* zone_;
70  Graph* const graph_;
71  MachineOperatorBuilder* machine_;
72  CommonOperatorBuilder* common_;
73  NodeMarker<State> state_;
74  ZoneDeque<NodeState> stack_;
75  Replacement* replacements_;
76  Signature<MachineRepresentation>* signature_;
77  Node* placeholder_;
78  int parameter_count_after_lowering_;
79};
80
81}  // namespace compiler
82}  // namespace internal
83}  // namespace v8
84
85#endif  // V8_COMPILER_SIMD_SCALAR_LOWERING_H_
86