simd-scalar-lowering.h revision c8c1d9e03f4babd16833b0f8ccf6aab5fa6e8c7a 
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
35  struct Replacement {
36    Node* node[kMaxLanes];
37    SimdType type;  // represents what input type is expected
38  };
39
40  Zone* zone() const { return zone_; }
41  Graph* graph() const { return graph_; }
42  MachineOperatorBuilder* machine() const { return machine_; }
43  CommonOperatorBuilder* common() const { return common_; }
44  Signature<MachineRepresentation>* signature() const { return signature_; }
45
46  void LowerNode(Node* node);
47  bool DefaultLowering(Node* node);
48
49  void ReplaceNode(Node* old, Node** new_nodes);
50  bool HasReplacement(size_t index, Node* node);
51  Node** GetReplacements(Node* node);
52  Node** GetReplacementsWithType(Node* node, SimdType type);
53  SimdType ReplacementType(Node* node);
54  void PreparePhiReplacement(Node* phi);
55  void SetLoweredType(Node* node, Node* output);
56
57  struct NodeState {
58    Node* node;
59    int input_index;
60  };
61
62  Zone* zone_;
63  Graph* const graph_;
64  MachineOperatorBuilder* machine_;
65  CommonOperatorBuilder* common_;
66  NodeMarker<State> state_;
67  ZoneDeque<NodeState> stack_;
68  Replacement* replacements_;
69  Signature<MachineRepresentation>* signature_;
70  Node* placeholder_;
71  int parameter_count_after_lowering_;
72};
73
74}  // namespace compiler
75}  // namespace internal
76}  // namespace v8
77
78#endif  // V8_COMPILER_SIMD_SCALAR_LOWERING_H_
79