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memcpy/memmove: Do not copy to same address

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In some cases (e.g. bootm with a elf payload which is already at the right
position) there is a in place copy of data to the same address. Catching this
saves some ms while booting.

Signed-off-by: Matthias Weisser <weisserm@arcor.de>
This commit is contained in:
Matthias Weisser 2011-05-22 23:03:55 +00:00 committed by Wolfgang Denk
parent 942e31437d
commit b038db852b
1 changed files with 6 additions and 0 deletions
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6
lib/string.c
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@ -467,6 +467,9 @@ void * memcpy(void *dest, const void *src, size_t count)
unsigned long *dl = (unsigned long *)dest, *sl = (unsigned long *)src;
char *d8, *s8;
if (src == dest)
return dest;
/* while all data is aligned (common case), copy a word at a time */
if ( (((ulong)dest | (ulong)src) & (sizeof(*dl) - 1)) == 0) {
while (count >= sizeof(*dl)) {
@ -497,6 +500,9 @@ void * memmove(void * dest,const void *src,size_t count)
{
char *tmp, *s;
if (src == dest)
return dest;
if (dest <= src) {
tmp = (char *) dest;
s = (char *) src;