On 03/12/2013 09:50 AM, Peter Lieven wrote:
> performance gain on SSE2 is approx. 20-25%. altivec
> is not tested. performance for unsigned long arithmetic
> is unchanged.
>
> Signed-off-by: Peter Lieven <p...@kamp.de>
> ---
> util/cutils.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/util/cutils.c b/util/cutils.c
> index a09d8e8..23f0cd6 100644
> --- a/util/cutils.c
> +++ b/util/cutils.c
> @@ -186,6 +186,11 @@ bool buffer_is_zero(const void *buf, size_t len)
> * latency.
> */
>
> + if (((uintptr_t) buf) % sizeof(VECTYPE) == 0
> + && len % 8*sizeof(VECTYPE) == 0) {Space around binary operators. Use CHAR_BITS instead of a magic number 8. Also, did you mean: len % (CHAR_BITS * sizeof(VECTYPE)) instead of what you wrote as '(len % 8) * sizeof(VECTYPE)'? > + return buffer_find_nonzero_offset(buf, len)==len; > + } > + > size_t i; > long d0, d1, d2, d3; > const long * const data = buf; -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
signature.asc
Description: OpenPGP digital signature
