[FFmpeg-devel] [PATCH] SPARC VIS simple_idct try #2

[Balatoni Denes]

Hi!

Ah, one DECLARE_ALIGNED_8 was missed. Updated patch attached.

bye
Denes

Tuesday 21 August 2007 22:35-kor Balatoni Denes ezt ?rta:
> Hi!
>
> Here is a patch to add sparc vis optimized simple_idct. Speedwise it is
> about halfway between the C and the mlib version, slightly on the faster
> side. Although the mlib version is faster, this is more accurate - and I
> honestly don't know why it is not faster on the sparc than it is, it should
> be according to my estimates, but it is not.
> Also, although it's the same algorithm as simple_idct, it might be less
> accurate on rare occasions, because of the primitive slow split 8+8 bit
> multply operation in VIS. I am hoping the idct won't overflow, too.
>
> bye
> Denes
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