We started defauling to nasm 8 years ago.
We are still compatible with yasm 0.8.0, released in 2009. **15 years ago**.
The time has more than come to remove support for it.
Maintaining compatibility started cutting into writing new code long ago.
We still can't have 2-argument instructions, preprocessor booleans, and all
AVX2 code must still be wrapped in ifdefs. Newly added code often breaks this.
NASM is more actively maintained and permits generating dependency information
as a sideeffect of assembling, thus cutting build times in half.
(Cherry-picked from libav commit 57b753b445e23363c997a8ec1c556e0b0f6e9da3)
Signed-off-by: James Almer <jamrial@gmail.com>
* commit '2ec9fa5ec60dcd10e1cb10d8b4e4437e634ea428':
idct: Change type of array stride parameters to ptrdiff_t
Merged-by: James Almer <jamrial@gmail.com>
The macro hell sometimes make it difficult to trace the source of
an error, so it is easier to analyze the preprocessed output.
This patch makes this automatical by specifying DBG=1 on the
command line: a file ffmpeg/dir/file.asm gets preprocessed to
builddir/dir/file.dbg.asm, which is then compiled.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
* commit '57f09608e1600d1cf1679885a46f5004d522d68f':
dsputil: Move thirdpel-related bits into their own context
Conflicts:
libavcodec/svq3.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
* commit 'b4dd424d96f09f9bafb88e47f37df65dc4529143':
Remove all SPARC architecture optimizations
Conflicts:
Makefile
configure
libavcodec/sparc/dsputil_vis.c
libavcodec/sparc/dsputil_vis.h
libavcodec/sparc/hpeldsp_vis.c
libavcodec/sparc/simple_idct_vis.c
libavcodec/sparc/vis.h
libswscale/sparc/yuv2rgb_vis.c
libswscale/swscale_internal.h
If someone wants to maintain these (or other) SPARC optimizations, please
contact me or ffmpeg-devel.
I am happy to revert this removial if theres someone considering to
maintain this code.
Merged-by: Michael Niedermayer <michaelni@gmx.at>
This cleanup patch updates the developer documentation with respect to
the migration to the git scm.
(cherry picked from commit 87800dc2bf8f2724a99e51bb079ad7fb4b9dfd3b)
- mention clobber-marking of xmm registers,
- some notes on external vs. inline asm, including tips on which to use for
what situation and to not rewrite+improve in the same patch (as with C code)
- some more best-practice guidelines
See "[PATCH] update doc/optimization.txt" thread on ML.
Originally committed as revision 25170 to svn://svn.ffmpeg.org/ffmpeg/trunk
It contains optimizations that are not specific to i386 and
libavutil uses this naming scheme already.
Originally committed as revision 16270 to svn://svn.ffmpeg.org/ffmpeg/trunk
Neither the asm() nor the __asm__() keyword is part of the C99
standard, but while GCC accepts the former in C89 syntax, it is not
accepted in C99 unless GNU extensions are turned on (with -fasm). The
latter form is accepted in any syntax as an extension (without
requiring further command-line options).
Sun Studio C99 compiler also does not accept asm() while accepting
__asm__(), albeit reporting warnings that it's not valid C99 syntax.
Originally committed as revision 15627 to svn://svn.ffmpeg.org/ffmpeg/trunk
