[FFmpeg-devel] [aarch64] improve performance of ff_hscale_8_to_15_neon

[Jean-Baptiste Kempf]

On Tue, Nov 26, 2019, at 05:51, Sebastian Pop wrote:
> On Mon, Nov 25, 2019 at 4:18 PM Jean-Baptiste Kempf <jb at videolan.org> wrote:
> > Why adding a new version, in intrinsics, instead of changing the existing implementation?
> >
> 
> Personal preference: I like to read c code instead of asm.
> Also I find it much easier to experiment by changing c code rather than asm.
> 
> Is there a coding rule in ffmpeg that restricts the use of intrinsics?

Yes. See doc/optimization.txt.
Use external asm (nasm/yasm) or inline asm (__asm__()), do not use intrinsics.

Also, here, you're changing some existing code, please improve the code and do not duplicate code.

> If that is the case, I can adapt my code to the existing asm code.

Please.


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Jean-Baptiste Kempf -  President
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