[wasm]implement simd lowering for f32x4->i32x4, i32x4 min/max and shift instructions

src/compiler/simd-scalar-lowering.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_SIMD_SCALAR_LOWERING_H_
 #define V8_COMPILER_SIMD_SCALAR_LOWERING_H_
 
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
+#include "src/compiler/js-graph.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-marker.h"
 #include "src/zone/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class SimdScalarLowering {
  public:
-  SimdScalarLowering(Graph* graph, MachineOperatorBuilder* machine,
-                     CommonOperatorBuilder* common, Zone* zone,
+  SimdScalarLowering(JSGraph* jsgraph,
                      Signature<MachineRepresentation>* signature);
 
   void LowerGraph();
 
   int GetParameterCountAfterLowering();
 
  private:
   enum class State : uint8_t { kUnvisited, kOnStack, kVisited };
 
   enum class SimdType : uint8_t { kInt32, kFloat32 };
 
   static const int kMaxLanes = 4;
   static const int kLaneWidth = 16 / kMaxLanes;
 
   struct Replacement {
     Node* node[kMaxLanes];
     SimdType type;  // represents what input type is expected
   };
 
-  Zone* zone() const { return zone_; }
-  Graph* graph() const { return graph_; }
-  MachineOperatorBuilder* machine() const { return machine_; }
-  CommonOperatorBuilder* common() const { return common_; }
+  Zone* zone() const { return jsgraph_->zone(); }
+  Graph* graph() const { return jsgraph_->graph(); }
+  MachineOperatorBuilder* machine() const { return jsgraph_->machine(); }
+  CommonOperatorBuilder* common() const { return jsgraph_->common(); }
   Signature<MachineRepresentation>* signature() const { return signature_; }
 
   void LowerNode(Node* node);
   bool DefaultLowering(Node* node);
 
   void ReplaceNode(Node* old, Node** new_nodes);
   bool HasReplacement(size_t index, Node* node);
   Node** GetReplacements(Node* node);
   Node** GetReplacementsWithType(Node* node, SimdType type);
   SimdType ReplacementType(Node* node);
   void PreparePhiReplacement(Node* phi);
   void SetLoweredType(Node* node, Node* output);
   void GetIndexNodes(Node* index, Node** new_indices);
   void LowerLoadOp(MachineRepresentation rep, Node* node,
                    const Operator* load_op);
   void LowerStoreOp(MachineRepresentation rep, Node* node,
                     const Operator* store_op, SimdType rep_type);
   void LowerBinaryOp(Node* node, SimdType input_rep_type, const Operator* op);
   void LowerUnaryOp(Node* node, SimdType input_rep_type, const Operator* op);
+  void LowerIntMinMax(Node* node, const Operator* op, bool is_max);
+  void LowerConvertFromFloat(Node* node, bool is_signed);
+  void LowerShiftOp(Node* node, const Operator* op);
+  Node* BuildF64Trunc(Node* input);
 
   struct NodeState {

[Mircea Trofin, 2017/03/03 01:26:50]

while here, mind moving this struct together with "Replacement" above?

[aseemgarg, 2017/03/03 01:35:59]

Done.

     Node* node;
     int input_index;
   };
 
-  Zone* zone_;
-  Graph* const graph_;
-  MachineOperatorBuilder* machine_;
-  CommonOperatorBuilder* common_;
+  JSGraph* const jsgraph_;
   NodeMarker<State> state_;
   ZoneDeque<NodeState> stack_;
   Replacement* replacements_;
   Signature<MachineRepresentation>* signature_;
   Node* placeholder_;
   int parameter_count_after_lowering_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_SIMD_SCALAR_LOWERING_H_