[Ffmpeg-devel] [PATCH] wma optimizations

[Benjamin Larsson]

Michael Niedermayer wrote:

>Hi
>
>On Sat, Aug 19, 2006 at 02:51:03AM +0200, Benjamin Larsson wrote:
>  
>
>>With the new dsp vector functions in the wma decoder it shaved of about
>>120000 dezicycles from the windowing code loop.
>>
>>Non simd before optimization:
>>138006 dezicycles in winmul, 4090 runs, 6 skipss dup=0 drop=0
>>81426 dezicycles in winspecial, 4091 runs, 5 skips
>>137845 dezicycles in winmul, 8172 runs, 20 skips dup=0 drop=0
>>81290 dezicycles in winspecial, 8177 runs, 15 skips
>>137565 dezicycles in winmul, 16350 runs, 34 skipsdup=0 drop=0
>>81051 dezicycles in winspecial, 16358 runs, 26 skips
>>
>>Simd:
>>50668 dezicycles in winmul, 4092 runs, 4 skips/s dup=0 drop=0
>>42723 dezicycles in winspecial, 4091 runs, 5 skips
>>50486 dezicycles in winmul, 8186 runs, 6 skips
>>42602 dezicycles in winspecial, 8186 runs, 6 skips
>>50317 dezicycles in winmul, 16369 runs, 15 skips dup=0 drop=0
>>42464 dezicycles in winspecial, 16370 runs, 14 skips
>>
>>A md5sum test on an amd64 box gave the same checksum for both versions.
>>But I'm not sure that would be true for all kind of simd code, but the
>>diffrent rounding should only lead to 1 bit differences.
>>
>>Overall speedup is around 3%. (From 14.2 -> 13.8).
>>    
>>
>
>great, and patch looks ok
>
>[...]
>  
>
Applied.

/Benjamin

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