From: Alessandro Rubini rubini@unipv.it
If the destination is aligned, fill ulong values until possible. Then fill remaining part by bytes.
Signed-off-by: Alessandro Rubini rubini@unipv.it Acked-by: Andrea Gallo andrea.gallo@stericsson.com --- 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); ++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; }