ARM: Small copy optimization. Copying 64bits at a time.

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 194 matching lines @@
 // Used as roots register.
 const Register r10 = { kRegister_r10_Code };
 const Register fp  = { kRegister_fp_Code };
 const Register ip  = { kRegister_ip_Code };
 const Register sp  = { kRegister_sp_Code };
 const Register lr  = { kRegister_lr_Code };
 const Register pc  = { kRegister_pc_Code };
 
 // Single word VFP register.
 struct SwVfpRegister {
+  static const int kSizeInBytes = 4;
   bool is_valid() const { return 0 <= code_ && code_ < 32; }
   bool is(SwVfpRegister reg) const { return code_ == reg.code_; }
   int code() const {
     ASSERT(is_valid());
     return code_;
   }
   int bit() const {
     ASSERT(is_valid());
     return 1 << code_;
   }
@@ skipping 10 matching lines @@
 // Double word VFP register.
 struct DwVfpRegister {
   static const int kMaxNumRegisters = 32;
   // A few double registers are reserved: one as a scratch register and one to
   // hold 0.0, that does not fit in the immediate field of vmov instructions.
   //  d14: 0.0
   //  d15: scratch register.
   static const int kNumReservedRegisters = 2;
   static const int kMaxNumAllocatableRegisters = kMaxNumRegisters -
       kNumReservedRegisters;
+  static const int kSizeInBytes = 8;
 
   // Note: the number of registers can be different at snapshot and run-time.
   // Any code included in the snapshot must be able to run both with 16 or 32
   // registers.
   inline static int NumRegisters();
   inline static int NumAllocatableRegisters();
 
   inline static int ToAllocationIndex(DwVfpRegister reg);
   static const char* AllocationIndexToString(int index);
   inline static DwVfpRegister FromAllocationIndex(int index);
@@ skipping 1183 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_