[U-Boot] [PATCH v6 04/18] string: Use memcpy() within memmove() when we can

[Simon Glass]

A common use of memmove() can be handled by memcpy(). Also memcpy()
includes an optimisation for large sizes: it copies a word at a time. So
we can get a speed-up by calling memcpy() to handle our move in this case.

Update memmove() to call memcpy() if the destination is before the source.

Signed-off-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Tom Rini <trini at konsulko.com>
---

Changes in v6: None
Changes in v5: None
Changes in v4: None
Changes in v3: None

 lib/string.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/lib/string.c b/lib/string.c
index c1a28c14ce..e94021c468 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -511,16 +511,9 @@ 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;
-		while (count--)
-			*tmp++ = *s++;
-		}
-	else {
+		memcpy(dest, src, count);
+	} else {
 		tmp = (char *) dest + count;
 		s = (char *) src + count;
 		while (count--)
-- 
2.12.2.715.g7642488e1d-goog