[Ffmpeg-cvslog] r7790 - trunk/libavcodec/armv4l/simple_idct_armv6.S

[Guillaume POIRIER]

Hi,

On 2/1/07, mru <subversion at mplayerhq.hu> wrote:
> Author: mru
> Date: Thu Feb  1 00:04:56 2007
> New Revision: 7790
>
> Modified:
>    trunk/libavcodec/armv4l/simple_idct_armv6.S
>
> Log:
> optimize IDCT of rows with mostly zero coefficients

Out of curiosity, does the "mostly zero coefficients" constraint need
to be enforced to prevent overflow? In other words, does your
optimized routine manage to be faster because you compute everything
in, say 16bits precision when the C code would do everything in 32
bits (that's just an example)?

I'm just curious, because I don't know anything about ARM.

Guillaume