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Commit d7c18400 authored by Miao Xie's avatar Miao Xie Committed by Razziell
Browse files

lib/string: use glibc version 

the performance of memcpy and memmove of the general version is very
inefficient, this patch improved them.

Signed-off-by: Miao Xie <miaox*******>
parent f6293ac9

lib/string.c

+12 −17
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/export.h>

#include <linux/bug.h>

#include <linux/errno.h>

#include <linux/memcopy.h>



#include <asm/byteorder.h>

#include <asm/word-at-a-time.h>
@@ -715,11 +716,11 @@ EXPORT_SYMBOL(memzero_explicit); 
 */

void *memcpy(void *dest, const void *src, size_t count)

{

	char *tmp = dest;

	const char *s = src;

	unsigned long dstp = (unsigned long)dest; 

	unsigned long srcp = (unsigned long)src; 



	while (count--)

		*tmp++ = *s++;

	/* Copy from the beginning to the end */ 

	mem_copy_fwd(dstp, srcp, count); 

	return dest;

}

EXPORT_SYMBOL(memcpy);
@@ -736,21 +737,15 @@ EXPORT_SYMBOL(memcpy); 
 */

void *memmove(void *dest, const void *src, size_t count)

{

	char *tmp;

	const char *s;

	unsigned long dstp = (unsigned long)dest; 

	unsigned long srcp = (unsigned long)src; 



	if (dest <= src) {

		tmp = dest;

		s = src;

		while (count--)

			*tmp++ = *s++;

	if (dest - src >= count) { 

		/* Copy from the beginning to the end */ 

		mem_copy_fwd(dstp, srcp, count);

	} else {

		tmp = dest;

		tmp += count;

		s = src;

		s += count;

		while (count--)

			*--tmp = *--s;

		/* Copy from the end to the beginning */ 

		mem_copy_bwd(dstp, srcp, count); 

	}

	return dest;

}