Revert of [builtins] Introduce proper Float64Exp 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 "src/base/flags.h"
 #include "src/bootstrapper.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/common-operator.h"
@@ skipping 1525 matching lines @@
     if (function->shared()->HasBuiltinFunctionId()) {
       switch (function->shared()->builtin_function_id()) {
         case kMathRandom:
           return Type::OrderedNumber();
         case kMathFloor:
         case kMathCeil:
         case kMathRound:
         case kMathTrunc:
           return t->cache_.kIntegerOrMinusZeroOrNaN;
         // Unary math functions.
-        case kMathExp:
-          return Type::Union(Type::PlainNumber(), Type::NaN(), t->zone());
         case kMathAbs:
         case kMathLog:
+        case kMathExp:
         case kMathSqrt:
         case kMathCos:
         case kMathSin:
         case kMathTan:
         case kMathAcos:
         case kMathAsin:
         case kMathAtan:
         case kMathFround:
           return Type::Number();
         // Binary math functions.
@@ skipping 234 matching lines @@
 Type* Typer::Visitor::TypeNumberFloor(Node* node) {
   return TypeUnaryOp(node, NumberFloor);
 }
 
 Type* Typer::Visitor::TypeNumberFround(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeNumberAtan(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeNumberAtan2(Node* node) { return Type::Number(); }
 
-Type* Typer::Visitor::TypeNumberExp(Node* node) {
-  return Type::Union(Type::PlainNumber(), Type::NaN(), zone());
-}
-
 Type* Typer::Visitor::TypeNumberLog(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeNumberLog1p(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeNumberLog2(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeNumberLog10(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeNumberRound(Node* node) {
   return TypeUnaryOp(node, NumberRound);
@@ skipping 739 matching lines @@
 
 Type* Typer::Visitor::TypeFloat64Abs(Node* node) {
   // TODO(turbofan): We should be able to infer a better type here.
   return Type::Number();
 }
 
 Type* Typer::Visitor::TypeFloat64Atan(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeFloat64Atan2(Node* node) { return Type::Number(); }
 
-Type* Typer::Visitor::TypeFloat64Exp(Node* node) { return Type::Number(); }
-
 Type* Typer::Visitor::TypeFloat64Log(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeFloat64Log1p(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeFloat64Log2(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeFloat64Log10(Node* node) { return Type::Number(); }
 
 Type* Typer::Visitor::TypeFloat64Sqrt(Node* node) { return Type::Number(); }
 
@@ skipping 156 matching lines @@
   }
   if (Type::IsInteger(*value)) {
     return Type::Range(value->Number(), value->Number(), zone());
   }
   return Type::Constant(value, zone());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8