Add the concept of FloatRegister for all platforms.

src/x64/assembler-x64.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 165 matching lines @@
   V(xmm7)                   \
   V(xmm8)                   \
   V(xmm9)                   \
   V(xmm10)                  \
   V(xmm11)                  \
   V(xmm12)                  \
   V(xmm13)                  \
   V(xmm14)                  \
   V(xmm15)
 
+#define FLOAT_REGISTERS DOUBLE_REGISTERS
+
 #define ALLOCATABLE_DOUBLE_REGISTERS(V) \
   V(xmm1)                               \
   V(xmm2)                               \
   V(xmm3)                               \
   V(xmm4)                               \
   V(xmm5)                               \
   V(xmm6)                               \
   V(xmm7)                               \
   V(xmm8)                               \
   V(xmm9)                               \
   V(xmm10)                              \
   V(xmm11)                              \
   V(xmm12)                              \
   V(xmm13)                              \
   V(xmm14)                              \
   V(xmm15)
 
-
-struct DoubleRegister {
+struct XMMRegister {
   enum Code {
 #define REGISTER_CODE(R) kCode_##R,
     DOUBLE_REGISTERS(REGISTER_CODE)
 #undef REGISTER_CODE
         kAfterLast,
     kCode_no_reg = -1
   };
 
   static const int kMaxNumRegisters = Code::kAfterLast;
 
-  static DoubleRegister from_code(int code) {
-    DoubleRegister result = {code};
+  static XMMRegister from_code(int code) {
+    XMMRegister result = {code};
     return result;
   }
 
   const char* ToString();
   bool IsAllocatable() const;
   bool is_valid() const { return 0 <= reg_code && reg_code < kMaxNumRegisters; }
-  bool is(DoubleRegister reg) const { return reg_code == reg.reg_code; }
+  bool is(XMMRegister reg) const { return reg_code == reg.reg_code; }
   int code() const {
     DCHECK(is_valid());
     return reg_code;
   }
 
   // Return the high bit of the register code as a 0 or 1.  Used often
   // when constructing the REX prefix byte.
   int high_bit() const { return reg_code >> 3; }
   // Return the 3 low bits of the register code.  Used when encoding registers
   // in modR/M, SIB, and opcode bytes.
   int low_bits() const { return reg_code & 0x7; }
 
   // Unfortunately we can't make this private in a struct when initializing
   // by assignment.
   int reg_code;
 };
 
+typedef XMMRegister FloatRegister;
+
+typedef XMMRegister DoubleRegister;
+
+typedef XMMRegister Simd128Register;
 
 #define DECLARE_REGISTER(R) \
   const DoubleRegister R = {DoubleRegister::kCode_##R};
 DOUBLE_REGISTERS(DECLARE_REGISTER)
 #undef DECLARE_REGISTER
 const DoubleRegister no_double_reg = {DoubleRegister::kCode_no_reg};
 
-
-typedef DoubleRegister XMMRegister;
-
-typedef DoubleRegister Simd128Register;
-
 enum Condition {
   // any value < 0 is considered no_condition
   no_condition  = -1,
 
   overflow      =  0,
   no_overflow   =  1,
   below         =  2,
   above_equal   =  3,
   equal         =  4,
   not_equal     =  5,
@@ skipping 1968 matching lines @@
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_X64_ASSEMBLER_X64_H_