Faster implementation of Math.exp()

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2066 matching lines @@
         break;
       case kMathSqrt:
       case kMathPowHalf:
       case kMathLog:
       case kMathSin:
       case kMathCos:
       case kMathTan:
         set_representation(Representation::Double());
         SetGVNFlag(kChangesNewSpacePromotion);
         break;
+      case kMathExp:
+        set_representation(Representation::Double());
+        break;
       default:
         UNREACHABLE();
     }
     SetFlag(kUseGVN);
   }
 
   HValue* context() { return OperandAt(0); }
   HValue* value() { return OperandAt(1); }
 
   virtual void PrintDataTo(StringStream* stream);
 
   virtual HType CalculateInferredType();
 
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited);
 
   virtual Representation RequiredInputRepresentation(int index) {
     if (index == 0) {
       return Representation::Tagged();
     } else {
       switch (op_) {
         case kMathFloor:
         case kMathRound:
         case kMathCeil:
         case kMathSqrt:
         case kMathPowHalf:
         case kMathLog:
+        case kMathExp:
         case kMathSin:
         case kMathCos:
         case kMathTan:
           return Representation::Double();
         case kMathAbs:
           return representation();
         default:
           UNREACHABLE();
           return Representation::None();
       }
@@ skipping 3263 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_