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authorAlessandro Rubini <rubini@unipv.it>2009-10-10 11:51:16 +0200
committerWolfgang Denk <wd@denx.de>2009-10-18 23:10:40 +0200
commite3ea948d4588e7efddbf0ee92147d93f827d7cea (patch)
tree9fbbe1bdda3923d5cc54f73120ceea4a3772a0c6
parentecd830b863e5c6ac5d804d3b3a92453a98d526fc (diff)
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lib_generic memset: fill one word at a time if possible
If the destination is aligned, fill ulong values until possible. Then fill remaining part by byte. Signed-off-by: Alessandro Rubini <rubini@unipv.it> Acked-by: Andrea Gallo <andrea.gallo@stericsson.com> Acked-by: Mike Frysinger <vapier@gentoo.org>
-rw-r--r--lib_generic/string.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/lib_generic/string.c b/lib_generic/string.c
index 61a45dc..b375b81 100644
--- a/lib_generic/string.c
+++ b/lib_generic/string.c
@@ -403,10 +403,26 @@ 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;
+ char *s8;
+ int i;
+
+ /* do it one word at a time (32 bits or 64 bits) while possible */
+ if ( ((ulong)s & (sizeof(*sl) - 1)) == 0) {
+ for (i = 0; i < sizeof(*sl); i++) {
+ cl <<= 8;
+ cl |= c & 0xff;
+ }
+ while (count >= sizeof(*sl)) {
+ *sl++ = cl;
+ count -= sizeof(*sl);
+ }
+ }
+ /* fill 8 bits at a time */
+ s8 = (char *)sl;
while (count--)
- *xs++ = c;
+ *s8++ = c;
return s;
}