In some cases (e.g. bootm with a elf payload) 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 --- lib/string.c | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/lib/string.c b/lib/string.c index b375b81..b8a9203 100644 --- a/lib/string.c +++ b/lib/string.c @@ -445,6 +445,9 @@ char * bcopy(const char * src, char * dest, int count) { char *tmp = dest;
+ if (src == dest) + return dest; + while (count--) *tmp++ = *src++;
@@ -467,6 +470,9 @@ 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 +503,9 @@ 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;