[turbofan] Introduce dedicated ObjectIsNaN operator.

src/compiler/typer.cc

 // 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.
 
 #include "src/compiler/typer.h"
 
 #include <iomanip>
 
 #include "src/base/flags.h"
 #include "src/bootstrapper.h"
@@ skipping 267 matching lines @@
 #undef DECLARE_METHOD
 #define DECLARE_METHOD(Name)                          \
   static Type* Name(Type* lhs, Type* rhs, Typer* t) { \
     return t->operation_typer_.Name(lhs, rhs);        \
   }
   SIMPLIFIED_NUMBER_BINOP_LIST(DECLARE_METHOD)
   SIMPLIFIED_SPECULATIVE_NUMBER_BINOP_LIST(DECLARE_METHOD)
 #undef DECLARE_METHOD
 
   static Type* ObjectIsDetectableCallable(Type*, Typer*);
+  static Type* ObjectIsNaN(Type*, Typer*);
   static Type* ObjectIsNonCallable(Type*, Typer*);
   static Type* ObjectIsNumber(Type*, Typer*);
   static Type* ObjectIsReceiver(Type*, Typer*);
   static Type* ObjectIsSmi(Type*, Typer*);
   static Type* ObjectIsString(Type*, Typer*);
   static Type* ObjectIsUndetectable(Type*, Typer*);
 
   static ComparisonOutcome JSCompareTyper(Type*, Type*, Typer*);
   static ComparisonOutcome NumberCompareTyper(Type*, Type*, Typer*);
 
@@ skipping 207 matching lines @@
 }
 
 // Type checks.
 
 Type* Typer::Visitor::ObjectIsDetectableCallable(Type* type, Typer* t) {
   if (type->Is(Type::DetectableCallable())) return t->singleton_true_;
   if (!type->Maybe(Type::DetectableCallable())) return t->singleton_false_;
   return Type::Boolean();
 }
 
+Type* Typer::Visitor::ObjectIsNaN(Type* type, Typer* t) {
+  if (type->Is(Type::NaN())) return t->singleton_true_;
+  if (!type->Maybe(Type::NaN())) return t->singleton_false_;
+  return Type::Boolean();
+}
+
 Type* Typer::Visitor::ObjectIsNonCallable(Type* type, Typer* t) {
   if (type->Is(Type::NonCallable())) return t->singleton_true_;
   if (!type->Maybe(Type::NonCallable())) return t->singleton_false_;
   return Type::Boolean();
 }
 
 Type* Typer::Visitor::ObjectIsNumber(Type* type, Typer* t) {
   if (type->Is(Type::Number())) return t->singleton_true_;
   if (!type->Maybe(Type::Number())) return t->singleton_false_;
   return Type::Boolean();
@@ skipping 1394 matching lines @@
 
 Type* Typer::Visitor::TypeStoreTypedElement(Node* node) {
   UNREACHABLE();
   return nullptr;
 }
 
 Type* Typer::Visitor::TypeObjectIsDetectableCallable(Node* node) {
   return TypeUnaryOp(node, ObjectIsDetectableCallable);
 }
 
+Type* Typer::Visitor::TypeObjectIsNaN(Node* node) {
+  return TypeUnaryOp(node, ObjectIsNaN);
+}
+
 Type* Typer::Visitor::TypeObjectIsNonCallable(Node* node) {
   return TypeUnaryOp(node, ObjectIsNonCallable);
 }
 
 Type* Typer::Visitor::TypeObjectIsNumber(Node* node) {
   return TypeUnaryOp(node, ObjectIsNumber);
 }
 
 
 Type* Typer::Visitor::TypeObjectIsReceiver(Node* node) {
@@ skipping 34 matching lines @@
 Type* Typer::Visitor::TypeConstant(Handle<Object> value) {
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::NewConstant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8