memcpy/memmove: Do not copy to same address
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>
diff --git a/lib/string.c b/lib/string.c
index b375b81..2c4f0ec 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -467,6 +467,9 @@
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 @@
{
char *tmp, *s;
+ if (src == dest)
+ return dest;
+
if (dest <= src) {
tmp = (char *) dest;
s = (char *) src;