This is more spec-compliant because it does not rely
on dead-code elimination by the compiler. Especially
MSVC has problems with this, as can be seen in
https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/296373.html
or
https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/297022.html
This commit does not eliminate every instance where we rely
on dead code elimination: It only tackles branching to
the initialization of arch-specific dsp code, not e.g. all
uses of CONFIG_ and HAVE_ checks. But maybe it is already
enough to compile FFmpeg with MSVC with whole-programm-optimizations
enabled (if one does not disable too many components).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
* commit '0c15a9aa7e1654a19144eb594f9639a57fd47482':
sh4: Remove dubious aligned dsputil code
Conflicts:
libavcodec/sh4/dsputil_align.c
libavcodec/sh4/h264chroma_init.c
libavcodec/sh4/hpeldsp.c
libavcodec/sh4/qpel.c
If someone wants to maintain the sh4 code in ffmpeg, wants to
add more optimizations, or volunteers to maintain any of
what is removed here and can confirm that they are faster.
Then please contact us!
Merged-by: Michael Niedermayer <michaelni@gmx.at>
The code represents a considerable maintenance burden and it is not
clear that it gives a noticeable benefit to outweigh this after 10
years of improvements in compiler technology since its creation.
Also use the resulting 16bpp functions for anything >8 and <=16, not just
9 and 10. This fixes 12 and 14bpp H264 support.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
