8 Oct
2009
8 Oct
'09
8:05 a.m.
On Thursday 08 October 2009 01:23:05 Chris Moore wrote:
Alessandro Rubini a écrit :
--- a/lib_generic/string.c +++ b/lib_generic/string.c @@ -449,7 +449,16 @@ char * bcopy(const char * src, char * dest, int count) void * memcpy(void * dest,const void *src,size_t count) { char *tmp = (char *) dest, *s = (char *) src;
u32 *d32 = (u32 *)dest, *s32 = (u32 *) src;
/* if both are aligned, use 32-bit copy */
if ( (((int)dest & 3) | ((int)src & 3) | (count & 3)) == 0 ) {
This can be factorized as (a & 3) | (b & 3) | (c & 3) is equivalent to (a | b | c) & 3. GCC is pretty smart but I doubt that it will pick this up :(
last time i looked (gcc-4.1 and gcc-4.3), it worked fine -mike