ARM: Make use of d16-d31 when available.

src/arm/simulator-arm.h

 // Copyright 2012 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 124 matching lines @@
     sp = 13,
     lr = 14,
     pc = 15,
     s0 = 0, s1, s2, s3, s4, s5, s6, s7,
     s8, s9, s10, s11, s12, s13, s14, s15,
     s16, s17, s18, s19, s20, s21, s22, s23,
     s24, s25, s26, s27, s28, s29, s30, s31,
     num_s_registers = 32,
     d0 = 0, d1, d2, d3, d4, d5, d6, d7,
     d8, d9, d10, d11, d12, d13, d14, d15,
-    num_d_registers = 16
+    d16, d17, d18, d19, d20, d21, d22, d23,
+    d24, d25, d26, d27, d28, d29, d30, d31,
+    num_d_registers = 32
   };
 
   explicit Simulator(Isolate* isolate);
   ~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 ARM
@@ skipping 208 matching lines @@
   // Saturating instructions require a Q flag to indicate saturation.
   // There is currently no way to read the CPSR directly, and thus read the Q
   // flag, so this is left unimplemented.
   int32_t registers_[16];
   bool n_flag_;
   bool z_flag_;
   bool c_flag_;
   bool v_flag_;
 
   // VFP architecture state.
-  unsigned int vfp_register[num_s_registers];
+  // TODO(hans): Rename vfp_register to vfp_registers_.
+  unsigned int vfp_register[num_d_registers * 2];
   bool n_flag_FPSCR_;
   bool z_flag_FPSCR_;
   bool c_flag_FPSCR_;
   bool v_flag_FPSCR_;
 
   // VFP rounding mode. See ARM DDI 0406B Page A2-29.
   VFPRoundingMode FPSCR_rounding_mode_;
 
   // VFP FP exception flags architecture state.
   bool inv_op_vfp_flag_;
@@ skipping 72 matching lines @@
 
   static inline void UnregisterCTryCatch() {
     Simulator::current(Isolate::Current())->PopAddress();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_ARM_SIMULATOR_ARM_H_