From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alessandro Rubini Date: Fri, 9 Oct 2009 11:12:32 +0200 Subject: [U-Boot] [PATCH V3 2/3] lib_generic memset: fill one word at a time if possible Message-ID: <20091009091232.GA3836@mail.gnudd.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de From: Alessandro Rubini If the destination is aligned, fill ulong values until possible. Then fill remaining part by bytes. Signed-off-by: Alessandro Rubini Acked-by: Andrea Gallo --- lib_generic/string.c | 22 +++++++++++++++++++--- 1 files changed, 19 insertions(+), 3 deletions(-) diff --git a/lib_generic/string.c b/lib_generic/string.c index 9bee79b..1575c63 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 ( ((count | (ulong)s) & (sizeof(*sl) - 1)) == 0) { + for (i=0; i= sizeof(*sl)) { + *sl++ = cl; + count -= sizeof(*sl); + } + } + /* fill 8 bits at a time */ + s8 = (char *)sl; while (count--) - *xs++ = c; + *s8++ = c; return s; } -- 1.5.6.5