[FFmpeg-trac] #8650(undetermined:new): arm64 vf_curves invalid 'asm': invalid operand for code 'w'

[FFmpeg]

#8650: arm64 vf_curves invalid 'asm': invalid operand for code 'w'
-------------------------------------+-------------------------------------
             Reporter:  kierank      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Using FFmpeg git head I can't build on arm64 with gcc 7.5.0:

 CC      libavfilter/vf_dctdnoiz.o
 In file included from ./libavutil/bswap.h:38:0,
                  from ./libavutil/intreadwrite.h:25,
                  from libavfilter/vf_curves.c:25:
 libavfilter/vf_curves.c: In function 'parse_psfile':
 ./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand
 for code 'w'
      __asm__("rev16 %w0, %w0" : "+r"(x));
      ^~~~~~~
 ./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand
 for code 'w'
 ./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand
 for code 'w'
      __asm__("rev16 %w0, %w0" : "+r"(x));
      ^~~~~~~
 ./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand
 for code 'w'
 ./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand
 for code 'w'
      __asm__("rev16 %w0, %w0" : "+r"(x));
      ^~~~~~~
 ./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand
 for code 'w'
 ./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand
 for code 'w'
      __asm__("rev16 %w0, %w0" : "+r"(x));
      ^~~~~~~
 ./libavutil/aarch64/bswap.h:31:5: error: invalid 'asm': invalid operand
 for code 'w'

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Ticket URL: <https://trac.ffmpeg.org/ticket/8650>
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