[FFmpeg-trac] #3653(swscale:new): Filtersize of 1 and x86 swscale code

[FFmpeg]

#3653: Filtersize of 1 and x86 swscale code
---------------------------------+---------------------------------------
             Reporter:  kurosu   |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  swscale  |                  Version:  unspecified
             Keywords:  SSE2     |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
---------------------------------+---------------------------------------
 Various values of $CPU crashes or generates incorrect results for make
 fate-h264-reinit-small_420_8-to-large_444_10 CPUFLAGS=$CPU

 $CPU=sse/mmx/mmxext/sse4.2 passes
 $CPU=sse2/ssse3 crashes
   fault in ff_hscale8to15_X8_sse2
   pmaddwd (%r10,%rax,2),%xmm1
   p/x $rax = 0x1
   p/x $r10+2*$rax : 0x8ba8b42
   can't pmaddwd from an unaligned address

 $CPU=sse4 doesn't crash but fails

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Ticket URL: <https://trac.ffmpeg.org/ticket/3653>
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