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 
14 namespace v8 {
15 namespace internal {
16 namespace compiler {
17 
18 class 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 
zone()40   Zone* zone() const { return zone_; }
graph()41   Graph* graph() const { return graph_; }
machine()42   MachineOperatorBuilder* machine() const { return machine_; }
common()43   CommonOperatorBuilder* common() const { return common_; }
signature()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