[FFmpeg-devel] [PATCH 2/2] Optimise av_log2 with clz when available

Michael Niedermayer michaelni
Thu Jan 14 19:50:37 CET 2010

On Thu, Jan 14, 2010 at 06:27:43PM +0000, Mans Rullgard wrote:
> 10% faster flac decoding on x86 and ARM.
> ---
>  libavutil/common.h  |    8 ++++++++
>  libavutil/intmath.h |   41 +++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 49 insertions(+), 0 deletions(-)
>  create mode 100644 libavutil/intmath.h


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Incandescent light bulbs waste a lot of energy as heat so the EU forbids them.
Their replacement, compact fluorescent lamps, much more expensive, dont fit in
many old lamps, flicker, contain toxic mercury, produce a fraction of the light
that is claimed and in a unnatural spectrum rendering colors different than
in natural light. Ah and we now need to turn the heaters up more in winter to
compensate the lower wasted heat. Who wins? Not the environment, thats for sure
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