memcpy.c File Reference

#include <libc.h>

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Functions
void *	memcpy (void *to, const void *from, size_t n)

---

Function Documentation

void* memcpy	(	void *	to,
		const void *	from,
		size_t	n
	)

Definition at line 20 of file memcpy.c.

{
#ifdef __i386__
  int d0;
  int d1;
  int d2;

  __asm__ __volatile__(
                       "rep ; movsl\n\t"
                       "testb $2,%b4\n\t"
                       "je 1f\n\t"
                       "movsw\n"
                       "1:\ttestb $1,%b4\n\t"
                       "je 2f\n\t"
                       "movsb\n"
                       "2:"
                       : "=&c" (d0), "=&D" (d1), "=&S" (d2)
                       :"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from)
                       : "memory");
#else
  char *cto = (char *)to;
  const char *cfrom = (const char *)from;

  for (; n > 0; n--)
  {
       *cto++ = *cfrom++;
  }
#endif
  return (to);
}