[mirror_ubuntu-zesty-kernel.git] / arch / x86 / lib / memmove_64.c

/* Normally compiler builtins are used, but sometimes the compiler calls out
   of line code. Based on asm-i386/string.h.
 */
#define _STRING_C
#include <linux/string.h>
#include <linux/module.h>

#undef memmove
void *memmove(void *dest, const void *src, size_t count)
{
	if (dest < src) {
		return memcpy(dest, src, count);
	} else {
		char *p = dest + count;
		const char *s = src + count;
		while (count--)
			*--p = *--s;
	}
	return dest;
}
EXPORT_SYMBOL(memmove);
Commit	Line	Data
1da177e4 LT	1	/* Normally compiler builtins are used, but sometimes the compiler calls out
	2	of line code. Based on asm-i386/string.h.
	3	*/
	4	#define _STRING_C
	5	#include <linux/string.h>
2ee60e17	6	#include <linux/module.h>
1da177e4 LT	7
1da177e4 LT	8	#undef memmove
e9406597	9	void memmove(void dest, const void *src, size_t count)
1da177e4	10	{
e9406597 PC	11	if (dest < src) {
e9406597 PC	12	return memcpy(dest, src, count);
1da177e4	13	} else {
ade1af77 JE	14	char *p = dest + count;
ade1af77 JE	15	const char *s = src + count;
1da177e4 LT	16	while (count--)
	17	--p = --s;
	18	}
	19	return dest;
e9406597	20	}
2ee60e17	21	EXPORT_SYMBOL(memmove);