Faster implementation of Math.exp()

src/arm/simulator-arm.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 187 matching lines @@
   // Executes ARM instructions until the PC reaches end_sim_pc.
   void Execute();
 
   // Call on program start.
   static void Initialize(Isolate* isolate);
 
   // V8 generally calls into generated JS code with 5 parameters and into
   // generated RegExp code with 7 parameters. This is a convenience function,
   // which sets up the simulator state and grabs the result on return.
   int32_t Call(byte* entry, int argument_count, ...);
+  // Alternative: call a 2-argument double function.
+  double CallFP(byte* entry, double d0, double d1);
 
   // Push an address onto the JS stack.
   uintptr_t PushAddress(uintptr_t address);
 
   // Pop an address from the JS stack.
   uintptr_t PopAddress();
 
   // Debugger input.
   void set_last_debugger_input(char* input);
   char* last_debugger_input() { return last_debugger_input_; }
@@ skipping 131 matching lines @@
   void GetFpArgs(double* x, int32_t* y);
   void SetFpResult(const double& result);
   void TrashCallerSaveRegisters();
 
   template<class ReturnType, int register_size>
       ReturnType GetFromVFPRegister(int reg_index);
 
   template<class InputType, int register_size>
       void SetVFPRegister(int reg_index, const InputType& value);
 
+  void CallInternal(byte* entry);
+
   // Architecture state.
   // Saturating instructions require a Q flag to indicate saturation.
   // There is currently no way to read the CPSR directly, and thus read the Q
   // flag, so this is left unimplemented.
   int32_t registers_[16];
   bool n_flag_;
   bool z_flag_;
   bool c_flag_;
   bool v_flag_;
 
@@ skipping 84 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_ARM_SIMULATOR_ARM_H_