1/*
2 * memcpy.c
3 */
4
5#include <string.h>
6#include <stdint.h>
7
8void *memcpy(void *dst, const void *src, size_t n)
9{
10	const char *p = src;
11	char *q = dst;
12#if defined(__i386__)
13	size_t nl = n >> 2;
14	asm volatile ("cld ; rep ; movsl ; movl %3,%0 ; rep ; movsb":"+c" (nl),
15		      "+S"(p), "+D"(q)
16		      :"r"(n & 3));
17#elif defined(__x86_64__)
18	size_t nq = n >> 3;
19	asm volatile ("cld ; rep ; movsq ; movl %3,%%ecx ; rep ; movsb":"+c"
20		      (nq), "+S"(p), "+D"(q)
21		      :"r"((uint32_t) (n & 7)));
22#else
23	while (n--) {
24		*q++ = *p++;
25	}
26#endif
27
28	return dst;
29}
30