Gavin Sherry <swm@linuxworld.com.au> writes:
> On 10 Oct 2002, Neil Conway wrote:
> > Compiled with '-DBUFFER_SIZE=256 -O2', I get the following results in
> > seconds:
> >
> > MemSet(): ~9.6
> > memset(): ~19.5
> > __builtin_memset(): ~10.00
>
> I ran the same code. I do not understand the results you go.
Interesting -- it may be the case that the optimizations performed by
GCC are architecture specific.
I searched for some threads about this on the GCC list. One
interesting result was this:
http://gcc.gnu.org/ml/gcc/2002-04/msg01114.html
One possible explanation for the different performance you saw is
explained by Jan Hubicka:
http://gcc.gnu.org/ml/gcc/2002-04/msg01146.html
One thing that confuses me is that GCC decides *not* to use
__builtin_memset() for some reason, even though it appears to be
superior to normal memset() on both of our systems.
Cheers,
Neil
--
Neil Conway <neilc@samurai.com> || PGP Key ID: DB3C29FC
