MIPS: Faster implementation of Math.exp()

src/mips/simulator-mips.h

 // Copyright 2011 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 166 matching lines @@
   ~Simulator();
 
   // The currently executing Simulator instance. Potentially there can be one
   // for each native thread.
   static Simulator* current(v8::internal::Isolate* isolate);
 
   // Accessors for register state. Reading the pc value adheres to the MIPS
   // architecture specification and is off by a 8 from the currently executing
   // instruction.
   void set_register(int reg, int32_t value);
+  void set_dw_register(int dreg, const int* dbl);
   int32_t get_register(int reg) const;
+  double get_double_from_register_pair(int reg);
   // Same for FPURegisters.
   void set_fpu_register(int fpureg, int32_t value);
   void set_fpu_register_float(int fpureg, float value);
   void set_fpu_register_double(int fpureg, double value);
   int32_t get_fpu_register(int fpureg) const;
   int64_t get_fpu_register_long(int fpureg) const;
   float get_fpu_register_float(int fpureg) const;
   double get_fpu_register_double(int fpureg) const;
   void set_fcsr_bit(uint32_t cc, bool value);
   bool test_fcsr_bit(uint32_t cc);
   bool set_fcsr_round_error(double original, double rounded);
 
   // Special case of set_register and get_register to access the raw PC value.
   void set_pc(int32_t value);
   int32_t get_pc() const;
 
   // Accessor to the internal simulator stack area.
   uintptr_t StackLimit() const;
 
   // Executes MIPS 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 119 matching lines @@
   // Runtime call support.
   static void* RedirectExternalReference(void* external_function,
                                          ExternalReference::Type type);
 
   // For use in calls that take double value arguments.
   void GetFpArgs(double* x, double* y);
   void GetFpArgs(double* x);
   void GetFpArgs(double* x, int32_t* y);
   void SetFpResult(const double& result);
 
+  void CallInternal(byte* entry);
 
   // Architecture state.
   // Registers.
   int32_t registers_[kNumSimuRegisters];
   // Coprocessor Registers.
   int32_t FPUregisters_[kNumFPURegisters];
   // FPU control register.
   uint32_t FCSR_;
 
   // Simulator support.
@@ skipping 65 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_MIPS_SIMULATOR_MIPS_H_