[FFmpeg-devel] [PATCH] swscale_unscaled: fix and speed up DITHER_COPY macro for x86 with SSE2

Mateusz mateuszb at poczta.onet.pl
Fri Sep 22 20:06:07 EEST 2017

W dniu 2017-09-22 o 17:47, James Almer pisze:
> On 9/22/2017 12:23 PM, Mateusz wrote:
>> New version of the patch -- now it uses the same logic independent of the target bitdepth.
>> For x86_64 it is much faster than current code (with perfect quality), for x86_32 it is fast
>> if you add to configure: --extra-cflags="-msse2"
>> (for x86_32 with default configure options it is slower than current code but with better quality)
>> Please review/test.
>> Mateusz
> We don't accept intrinsics, or new arch specific code outside of arch
> specific folders.
> Either write this in NASM syntax, or if it *really* needs to be inlined,
> use __asm__() inline blocks. But whichever you use, it needs to go in
> the x86/ folder.

Thank you for the information! I'm starting learning NASM syntax (it could last for months).

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