Avoid a call to the runtime system when doing binary fp ops on ARM...

src/simulator-arm.h

 // Copyright 2008 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 156 matching lines @@
   void DecodeType2(Instr* instr);
   void DecodeType3(Instr* instr);
   void DecodeType4(Instr* instr);
   void DecodeType5(Instr* instr);
   void DecodeType6(Instr* instr);
   void DecodeType7(Instr* instr);
 
   // Executes one instruction.
   void InstructionDecode(Instr* instr);
 
+  // For use in calls that take two double values, constructed from r0, r1, r2
+  // and r3.
+  void GetFpArgs(double* x, double* y);
+  void SetFpResult(const double& result);
+  void TrashCallerSaveRegisters();
+
   // architecture state
   int32_t registers_[16];
   bool n_flag_;
   bool z_flag_;
   bool c_flag_;
   bool v_flag_;
 
   // simulator support
   char* stack_;
   bool pc_modified_;
   int icount_;
 
   // registered breakpoints
   Instr* break_pc_;
   instr_t break_instr_;
 };
 
 } }  // namespace assembler::arm
 
 #endif  // defined(__arm__)
 
 #endif  // V8_SIMULATOR_ARM_H_