[FFmpeg-devel] [PATCH 1/5] truehd: add hand-scheduled ARM asm version of mlp_filter_channel.

[Michael Niedermayer]

On Thu, Mar 20, 2014 at 06:59:14PM +0000, Ben Avison wrote:
> Profiling results for overall audio decode and the mlp_filter_channel(_arm)
> function in particular are as follows:
> 
>               Before          After
>               Mean   StdDev   Mean   StdDev  Confidence  Change
> 6:2 total     380.4  22.0     370.8  17.0    87.4%       +2.6%  (insignificant)
> 6:2 function  60.7   7.2      36.6   8.1     100.0%      +65.8%
> 8:2 total     357.0  17.5     343.2  19.0    97.8%       +4.0%  (insignificant)
> 8:2 function  60.3   8.8      37.3   3.8     100.0%      +61.8%
> 6:6 total     717.2  23.2     658.4  15.7    100.0%      +8.9%
> 6:6 function  140.4  12.9     81.5   9.2     100.0%      +72.4%
> 8:8 total     981.9  16.2     896.2  24.5    100.0%      +9.6%
> 8:8 function  193.4  15.0     103.3  11.5    100.0%      +87.2%
> 
> Experiments with adding preload instructions to this function yielded no
> useful benefit, so these have not been included.
> 
> The assembly version has also been tested with a fuzz tester to ensure that
> any combinations of inputs not exercised by my available test streams still
> generate mathematically identical results to the C version.
> ---
>  libavcodec/arm/Makefile          |    2 +
>  libavcodec/arm/mlpdsp_arm.S      |  433 ++++++++++++++++++++++++++++++++++++++
>  libavcodec/arm/mlpdsp_init_arm.c |   36 +++
>  libavcodec/mlpdsp.c              |    2 +
>  libavcodec/mlpdsp.h              |    1 +
>  5 files changed, 474 insertions(+), 0 deletions(-)
>  create mode 100644 libavcodec/arm/mlpdsp_arm.S
>  create mode 100644 libavcodec/arm/mlpdsp_init_arm.c

applied and changes from the libav side merged

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Old school: Use the lowest level language in which you can solve the problem
            conveniently.
New school: Use the highest level language in which the latest supercomputer
            can solve the problem without the user falling asleep waiting.
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