[turbofan] Improve representation selection for Smi checking.

src/compiler/representation-change.h

 // Copyright 2014 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_REPRESENTATION_CHANGE_H_
 #define V8_COMPILER_REPRESENTATION_CHANGE_H_
 
 #include "src/compiler/js-graph.h"
 #include "src/compiler/simplified-operator.h"
 
@@ skipping 132 matching lines @@
     return UseInfo(MachineRepresentation::kTagged, Truncation::Any());
   }
   static UseInfo TaggedSigned() {
     return UseInfo(MachineRepresentation::kTaggedSigned, Truncation::Any());
   }
   static UseInfo TaggedPointer() {
     return UseInfo(MachineRepresentation::kTaggedPointer, Truncation::Any());
   }
 
   // Possibly deoptimizing conversions.
+  static UseInfo CheckedSignedSmallAsTaggedSigned() {
+    return UseInfo(MachineRepresentation::kTaggedSigned, Truncation::Any(),
+                   TypeCheckKind::kSignedSmall);
+  }
   static UseInfo CheckedSignedSmallAsWord32() {
     return UseInfo(MachineRepresentation::kWord32, Truncation::Any(),
                    TypeCheckKind::kSignedSmall);
   }
   static UseInfo CheckedSigned32AsWord32() {
     return UseInfo(MachineRepresentation::kWord32, Truncation::Any(),
                    TypeCheckKind::kSigned32);
   }
   static UseInfo CheckedNumberAsFloat64() {
     return UseInfo(MachineRepresentation::kFloat64, Truncation::Float64(),
@@ skipping 73 matching lines @@
   JSGraph* jsgraph_;
   Isolate* isolate_;
 
   friend class RepresentationChangerTester;  // accesses the below fields.
 
   bool testing_type_errors_;  // If {true}, don't abort on a type error.
   bool type_error_;           // Set when a type error is detected.
 
   Node* GetTaggedSignedRepresentationFor(Node* node,
                                          MachineRepresentation output_rep,
-                                         Type* output_type);
+                                         Type* output_type, Node* use_node,
+                                         UseInfo use_info);
   Node* GetTaggedPointerRepresentationFor(Node* node,
                                           MachineRepresentation output_rep,
                                           Type* output_type);
   Node* GetTaggedRepresentationFor(Node* node, MachineRepresentation output_rep,
                                    Type* output_type, Truncation truncation);
   Node* GetFloat32RepresentationFor(Node* node,
                                     MachineRepresentation output_rep,
                                     Type* output_type, Truncation truncation);
   Node* GetFloat64RepresentationFor(Node* node,
                                     MachineRepresentation output_rep,
                                     Type* output_type, Node* use_node,
                                     UseInfo use_info);
   Node* GetWord32RepresentationFor(Node* node, MachineRepresentation output_rep,
                                    Type* output_type, Node* use_node,
                                    UseInfo use_info);
   Node* GetBitRepresentationFor(Node* node, MachineRepresentation output_rep,
                                 Type* output_type);
   Node* GetWord64RepresentationFor(Node* node, MachineRepresentation output_rep,
                                    Type* output_type);
   Node* TypeError(Node* node, MachineRepresentation output_rep,
                   Type* output_type, MachineRepresentation use);
   Node* MakeTruncatedInt32Constant(double value);
+  Node* InsertChangeBitToTagged(Node* node);
   Node* InsertChangeFloat32ToFloat64(Node* node);
   Node* InsertChangeFloat64ToInt32(Node* node);
   Node* InsertChangeFloat64ToUint32(Node* node);
   Node* InsertChangeTaggedSignedToInt32(Node* node);
   Node* InsertChangeTaggedToFloat64(Node* node);
 
   Node* InsertConversion(Node* node, const Operator* op, Node* use_node);
 
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const { return isolate_; }
   Factory* factory() const { return isolate()->factory(); }
   SimplifiedOperatorBuilder* simplified() { return jsgraph()->simplified(); }
   MachineOperatorBuilder* machine() { return jsgraph()->machine(); }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_REPRESENTATION_CHANGE_H_