rep_movsb.c

   1 typedef unsigned long size_t;
   2 void *mymemcpy(void *restrict dest, const void *restrict src, size_t n)
   3 {
   4         __asm__("cld; rep; movsb" :: "S"(src),"D"(dest),"c"(n) : "memory");
   5         return dest;
   6 }