Begins implementation of ARM neon instructions.

runtime/vm/simulator_arm.h

 // Copyright (c) 2013, 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 ARM instructions if we are not generating a native
 // ARM binary. This Simulator allows us to run and debug ARM 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 ARM HW platform.
 
 #ifndef VM_SIMULATOR_ARM_H_
 #define VM_SIMULATOR_ARM_H_
 
 #ifndef VM_SIMULATOR_H_
 #error Do not include simulator_arm.h directly; use simulator.h.
 #endif
 
 #include "vm/constants_arm.h"
 #include "vm/object.h"
 
 namespace dart {
 
 class Isolate;
 class SimulatorSetjmpBuffer;
 
+typedef struct {
+  union {
+    uint32_t u;
+    float f;
+  } data_[4];
+} 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. Reading the pc value adheres to the ARM
   // architecture specification and is off by 8 from the currently executing
   // instruction.
   void set_register(Register reg, int32_t value);
   int32_t get_register(Register reg) const;
 
   // 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;
 
   // Accessors for VFP register state.
   void set_sregister(SRegister reg, float value);
   float get_sregister(SRegister reg) const;
   void set_dregister(DRegister reg, double value);
   double get_dregister(DRegister reg) const;
+  void set_qregister(QRegister reg, simd_value_t value);
+  simd_value_t get_qregister(QRegister reg) const;
 
   // When moving integer (rather than floating point) values to/from
   // the FPU registers, use the _bits calls to avoid gcc taking liberties with
   // integers that map to such things as NaN floating point values.
   void set_sregister_bits(SRegister reg, int32_t value);
   int32_t get_sregister_bits(SRegister reg) const;
   void set_dregister_bits(DRegister reg, int64_t value);
   int64_t get_dregister_bits(DRegister reg) const;
 
   // Accessor to the internal simulator stack top.
@@ skipping 56 matching lines @@
   static const uword kEndSimulatingPC = -2;
 
   // CPU state.
   int32_t registers_[kNumberOfCpuRegisters];
   bool n_flag_;
   bool z_flag_;
   bool c_flag_;
   bool v_flag_;
 
   // VFP state.
-  union {  // S and D register banks are overlapping.
+  union {  // S, D, and Q register banks are overlapping.
     int32_t sregisters_[kNumberOfSRegisters];
     int64_t dregisters_[kNumberOfDRegisters];
+    simd_value_t qregisters_[kNumberOfQRegisters];
   };
   bool fp_n_flag_;
   bool fp_z_flag_;
   bool fp_c_flag_;
   bool fp_v_flag_;
 
   // Simulator support.
   char* stack_;
   bool pc_modified_;
   int icount_;
@@ skipping 89 matching lines @@
   static bool HasExclusiveAccessAndOpen(uword addr);
 
   // Executing is handled based on the instruction type.
   void DecodeType01(Instr* instr);  // Both type 0 and type 1 rolled into one.
   void DecodeType2(Instr* instr);
   void DecodeType3(Instr* instr);
   void DecodeType4(Instr* instr);
   void DecodeType5(Instr* instr);
   void DecodeType6(Instr* instr);
   void DecodeType7(Instr* instr);
+  void DecodeSIMDDataProcessing(Instr* instr);
 
   // Executes one instruction.
   void InstructionDecode(Instr* instr);
 
   // Executes ARM instructions until the PC reaches kEndSimulatingPC.
   void Execute();
 
   // Longjmp support for exceptions.
   SimulatorSetjmpBuffer* last_setjmp_buffer() {
     return last_setjmp_buffer_;
   }
   void set_last_setjmp_buffer(SimulatorSetjmpBuffer* buffer) {
     last_setjmp_buffer_ = buffer;
   }
 
   friend class SimulatorDebugger;
   friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_ARM_H_