From e3ea948d4588e7efddbf0ee92147d93f827d7cea Mon Sep 17 00:00:00 2001 From: Alessandro Rubini Date: Sat, 10 Oct 2009 11:51:16 +0200 Subject: 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 Acked-by: Andrea Gallo Acked-by: Mike Frysinger --- lib_generic/string.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) (limited to 'lib_generic') diff --git a/lib_generic/string.c b/lib_generic/string.c index 61a45dc94d..b375b8124a 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; } -- cgit v1.2.1