Begins work on arm64 floating point instructions.

runtime/vm/simulator_arm64.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. 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 ARM64 instructions if we are not generating a native
 // ARM64 binary. This Simulator allows us to run and debug ARM64 code generation
 // on regular desktop machines.
 // Dart calls into generated code by "calling" the InvokeDartCode stub,
 // which will start execution in the Simulator or forwards to the real entry
 // on a ARM64 HW platform.
 
 #ifndef VM_SIMULATOR_ARM64_H_
 #define VM_SIMULATOR_ARM64_H_
 
 #ifndef VM_SIMULATOR_H_
 #error Do not include simulator_arm64.h directly; use simulator.h.
 #endif
 
 #include "vm/constants_arm64.h"
 #include "vm/object.h"
 
 namespace dart {
 
 class Isolate;
 class SimulatorSetjmpBuffer;
 
+typedef struct {
+  int64_t lo;
+  int64_t hi;
+} simd_value_t;
+
 class Simulator {
  public:
   static const uword kSimulatorStackUnderflowSize = 64;
 
   Simulator();
   ~Simulator();
 
   // The currently executing Simulator instance, which is associated to the
   // current isolate
   static Simulator* Current();
 
   // Accessors for register state.
   // The default value for R31Type has to be R31IsSP because get_register is
   // accessed from architecture independent code through SPREG without
   // specifying the type. We also can't translate a dummy value for SPREG into
   // a real value because the architecture independent code expects SPREG to
   // be a real register value.
   void set_register(Register reg, int64_t value, R31Type r31t = R31IsSP);
   int64_t get_register(Register reg, R31Type r31t = R31IsSP) const;
   void set_wregister(Register reg, int32_t value, R31Type r31t = R31IsSP);
   int32_t get_wregister(Register reg, R31Type r31t = R31IsSP) const;
 
+  // Get and set a V register in double ('d') mode. Setting clears the high
+  // 64 bits of the V register. Getting ignores the high 64 bits.
+  int64_t get_vregisterd(VRegister reg);
+  void set_vregisterd(VRegister reg, int64_t value);
+
   int64_t get_pc() const;
   int64_t get_last_pc() const;
   void set_pc(int64_t pc);
 
   // Accessor to the internal simulator stack top.
   uword StackTop() const;
 
   // The isolate's top_exit_frame_info refers to a Dart frame in the simulator
   // stack. The simulator's top_exit_frame_info refers to a C++ frame in the
   // native stack.
   uword top_exit_frame_info() const { return top_exit_frame_info_; }
   void set_top_exit_frame_info(uword value) { top_exit_frame_info_ = value; }
 
   // Call on program start.
   static void InitOnce() {}
 
   // Dart generally calls into generated code with 5 parameters. This is a
   // convenience function, which sets up the simulator state and grabs the
   // result on return. The return value is R0. The parameters are placed in
   // R0-3.
   int64_t Call(int64_t entry,
                int64_t parameter0,
                int64_t parameter1,
                int64_t parameter2,
-               int64_t parameter3);
+               int64_t parameter3,
+               bool fp_return = false,
+               bool fp_args = false);
 
   // Runtime and native call support.
   enum CallKind {
     kRuntimeCall,
     kLeafRuntimeCall,
     kLeafFloatRuntimeCall,
     kBootstrapNativeCall,
     kNativeCall
   };
   static uword RedirectExternalReference(uword function,
@@ skipping 16 matching lines @@
   // C code.
   static const uword kEndSimulatingPC = -2;
 
   // CPU state.
   int64_t registers_[kNumberOfCpuRegisters];
   bool n_flag_;
   bool z_flag_;
   bool c_flag_;
   bool v_flag_;
 
+  simd_value_t vregisters_[kNumberOfVRegisters];
+  bool fp_n_flag_;
+  bool fp_z_flag_;
+  bool fp_c_flag_;
+  bool fp_v_flag_;
+
   // Simulator support.
   int64_t last_pc_;
   int64_t pc_;
   char* stack_;
   bool pc_modified_;
   intptr_t icount_;
   static int64_t flag_stop_sim_at_;
   SimulatorSetjmpBuffer* last_setjmp_buffer_;
   uword top_exit_frame_info_;
 
@@ skipping 82 matching lines @@
   }
 
   friend class SimulatorDebugger;
   friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_ARM64_H_