[FFmpeg-devel] [PATCH] ac3enc: Add x86-optimized function to speed up log2_tab().

[Måns Rullgård]

"Ronald S. Bultje" <rsbultje at gmail.com> writes:

> Hi,
>
> On Sun, Feb 13, 2011 at 2:49 PM, Justin Ruggles
> <justin.ruggles at gmail.com> wrote:
>> AC3DSPContext.ac3_max_msb_abs_int16() finds the maximum MSB of the absolute
>> value of each element in an array of int16_t.
> [..]
>> Athlon64 X2 6000+:
>> ? C: 20718
>> ?MMX: ?3590
>> MMX2: ?2906
>> SSE2: ?2062
>>
>> Atom 330:
>> ? ?C: 31838
>> ?MMX: ?7394
>> ?SSE2: ?3138
>> SSSE3: ?2759
>>
>> ?libavcodec/ac3dsp.c ? ? ? ? | ? ?9 +++++
>> ?libavcodec/ac3dsp.h ? ? ? ? | ? 11 +++++++
>> ?libavcodec/ac3enc_fixed.c ? | ? 11 ++-----
>> ?libavcodec/x86/ac3dsp.asm ? | ? 69 +++++++++++++++++++++++++++++++++++++++++++
>> ?libavcodec/x86/ac3dsp_mmx.c | ? 11 +++++++
>> ?5 files changed, 103 insertions(+), 8 deletions(-)
>
> That looks really good, OK from me. I'll queue it and push later today
> if there's no objections.

Looks fine to me too.

-- 
M?ns Rullg?rd
mans at mansr.com