Add X32 port into V8

src/v8utils.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 242 matching lines @@
 inline void MemsetPointer(T** dest, U* value, int counter) {
 #ifdef DEBUG
   T* a = NULL;
   U* b = NULL;
   a = b;  // Fake assignment to check assignability.
   USE(a);
 #endif  // DEBUG
 #if V8_HOST_ARCH_IA32
 #define STOS "stosl"
 #elif V8_HOST_ARCH_X64
+#if V8_HOST_ARCH_32_BIT

[danno, 2013/07/17 13:33:21]

Are you sure the nesting is right here? It seems like this #if is only active
when V8_HOST_ARCH_X64 is also active, which can't happen, right?

[haitao.feng, 2013/07/18 10:04:09]

It is right. For X32, V8_HOST_ARCH_X64 and V8_HOST_ARCH_32_BIT are true. We did
not introduce V8_HOST_ARCH_X32 yet.

+#define STOS "addr32 stosl"
+#else
 #define STOS "stosq"
 #endif
+#endif
 #if defined(__native_client__)
   // This STOS sequence does not validate for x86_64 Native Client.
   // Here we #undef STOS to force use of the slower C version.
   // TODO(bradchen): Profile V8 and implement a faster REP STOS
   // here if the profile indicates it matters.
 #undef STOS
 #endif
 
 #if defined(__GNUC__) && defined(STOS)
   asm volatile(
@@ skipping 110 matching lines @@
 
   // Add formatted contents like printf based on a va_list.
   void AddFormattedList(const char* format, va_list list);
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(StringBuilder);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8UTILS_H_