MIPS: Add rounding support in simulator and RINT instruction.

src/mips64/simulator-mips64.h

 // Copyright 2011 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.
 
 
 // Declares a Simulator for MIPS instructions if we are not generating a native
 // MIPS binary. This Simulator allows us to run and debug MIPS code generation
 // on regular desktop machines.
 // V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro,
 // which will start execution in the Simulator or forwards to the real entry
@@ skipping 189 matching lines @@
   int64_t get_fpu_register(int fpureg) const;
   int32_t get_fpu_register_word(int fpureg) const;
   int32_t get_fpu_register_signed_word(int fpureg) const;
   int32_t get_fpu_register_hi_word(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);
   bool set_fcsr_round64_error(double original, double rounded);
+  void round_according_to_fcsr(double toRound, double& rounded,
+                               int32_t& rounded_int, double fs);
+  void round64_according_to_fcsr(double toRound, double& rounded,
+                                 int64_t& rounded_int, double fs);
 
   // Special case of set_register and get_register to access the raw PC value.
   void set_pc(int64_t value);
   int64_t get_pc() const;
 
   Address get_sp() {
     return reinterpret_cast<Address>(static_cast<intptr_t>(get_register(sp)));
   }
 
   // Accessor to the internal simulator stack area.
@@ skipping 292 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_MIPS_SIMULATOR_MIPS_H_