[U-Boot] [PATCH V2 2/3] memset: fill one word at a time if possible

[Alessandro Rubini]

From: Alessandro Rubini <rubini at unipv.it>

Signed-off-by: Alessandro Rubini <rubini at unipv.it>
Acked-by: Andrea Gallo <andrea.gallo at stericsson.com>
---
 lib_generic/string.c |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/lib_generic/string.c b/lib_generic/string.c
index 9911941..5f7aff9 100644
--- a/lib_generic/string.c
+++ b/lib_generic/string.c
@@ -404,7 +404,22 @@ char *strswab(const char *s)
 void * memset(void * s,int c,size_t count)
 {
 	char *xs = (char *) s;
-
+	unsigned long *sl = (unsigned long *) s;
+	unsigned long cl = 0;
+	int i;
+
+	/* do it one word at a time (32 bits or 64 bits) if possible */
+	if ( ((count | (int)s) & (sizeof(long) - 1)) == 0) {
+		count /= sizeof(long);
+		for (i=0; i<sizeof(long); ++i) {
+			cl <<= 8;
+			cl |= c & 0xff;
+		}
+		while (count--)
+			*sl++ = cl;
+		return s;
+	}
+	/* else, fill 8 bits at a time */
 	while (count--)
 		*xs++ = c;
 
-- 
1.6.0.2