[FFmpeg-trac] #9415(swscale:new): swscale/yuv2yuvX yasm port broke non-yasm builds

[FFmpeg]

#9415: swscale/yuv2yuvX yasm port broke non-yasm builds
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             Reporter:  Ben Boeckel  |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  swscale
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Ben Boeckel):

 Additionally reverts needed:

     51a34e8525fea2bbc29b42831d7a17f34e8518d3 sws: Replace call to
 yuv2yuvX_mmx by yuv2yuvX_mmxext
     a05f22eaf393177b94432431c145cbc5ba10390a swscale/x86/swscale: Remove
 obsolete and harmful MMX(EXT) functions
     bbe95f7353a972f28a48be8da883549f02c59e4b x86: replace explicit
 REP_RETs with RETs

 There are more conflicts now, so some manual fixups were needed, but I'm
 able to get a patchset which works on 6.0 now.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9415#comment:2>
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