[Ffmpeg-devel] Fixed vs. Floating Point AAC

[Loren Merritt]

On Thu, 9 Mar 2006, Michael Niedermayer wrote:

> so reusing some benchmark proggy here are the results, nicely written and
> source attached, feel free to design your own cpu which can do
> integer multiplies faster then floatingpoint ones
>
>                        latency throughput
> P3
> int     32*32    ->32   4       1
> int     32*32>>32->32   5.5     1/4.5
> float   32*32    ->32   5       1/2
>
> Duron
> int     32*32    ->32   4       1/2
> int     32*32>>32->32   6       1/4.5
> float   32*32    ->32   3.5     1
>
> Athlon
> int     32*32    ->32   4       1/2
> int     32*32>>32->32   6.5     1/5
> float   32*32    ->32   3.5     1

P4
int     32*32    ->32   14      1/4.5
int     32*32>>32->32   19      1/10.5
float   32*32    ->32    7      1/2

Athlon64
int     32*32    ->32    3      1
int     32*32>>32->32    5      1/2
float   32*32    ->32    3.5    1

:)

--Loren Merritt