Proper constraints for inline implementation in assembly.

src/utils.h

 // Copyright 2006-2008 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 563 matching lines @@
 
 template <typename T>
 static inline void MemsetPointer(T** dest, T* value, int counter) {
 #if defined(V8_HOST_ARCH_IA32)
 #define STOS "stosl"
 #elif defined(V8_HOST_ARCH_X64)
 #define STOS "stosq"
 #endif
 
 #if defined(__GNUC__) && defined(STOS)
-  asm("cld;"
+  asm volatile(
+      "cld;"
       "rep ; " STOS
-      : /* no output */
-      : "c" (counter), "a" (value), "D" (dest)
-      : /* no clobbered list as all inputs are considered clobbered */);
+      : "+&c" (counter), "+&D" (dest)
+      : "a" (value)
+      : "memory", "cc");
 #else
   for (int i = 0; i < counter; i++) {
     dest[i] = value;
   }
 #endif
 
 #undef STOS
 }
 
 
@@ skipping 33 matching lines @@
 
   Dest dest;
   memcpy(&dest, &source, sizeof(dest));
   return dest;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_