Loading pb_1 rather than pw_8192 was benchmarked to be more efficient.
Loading of the 2 yields no advantage. Loading of one saves ~11 cycles.
decicycles count:
put8: 3223(mmx) -> 2387
avg8: 2863(mmxext) -> 2125
put16: 4356(sse2) -> 3553
avg16: 4481(sse2) -> 3513
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This is a port of the inline assembly of the mmx version to use the
pavg(us|)b instruction.
8 16
mmx 1498 4355
mmx2 1242 3509
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Currently, only the mmx version is bitexact, the others (mmxext and
3dnow) are not, in spite of their naming.
Therefore, make their name more obvious. Also restore a comment that
was removed in 71155d7b.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
There are instructions pavgb and pavgusb. Both instructions do the same
operation but they have different enconding. Pavgb exists in SSE (or
MMXEXT) instruction set and pavgusb exists in 3D-NOW instruction set.
livavcodec uses the macro PAVGB to select the proper instruction. However,
the function avg_pixels8_xy2 doesn't use this macro, it uses pavgb
directly.
As a consequence, the function avg_pixels8_xy2 crashes on AMD K6-2 and
K6-3 processors, because they have pavgusb, but not pavgb.
This bug seems to be introduced by commit
71155d7b41, "dsputil: x86: Convert mpeg4
qpel and dsputil avg to yasm"
Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This way, they can be shared between mpeg4qpel and h264qpel without
requiring either one to be compiled unconditionally.
Signed-off-by: Martin Storsjö <martin@martin.st>
This way, they can be shared between mpeg4qpel and h264qpel without
requiring either one to be compiled unconditionally.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This also fixes the project name
Original authors fabrice and nick go back to the initial ffmpeg commit
Others for example contributed in: (for a complete list please use git blame / show / log)
commit e9c0a38ff0
Author: Zdenek Kabelac <kabi@informatics.muni.cz>
Date: Tue May 28 16:35:58 2002 +0000
* optimized avg_* functions (except xy2)
* minor speedup for put_pixels_x2 & cleanup
Originally committed as revision 619 to svn://svn.ffmpeg.org/ffmpeg/trunk
commit 607dce96c0
Author: Michael Niedermayer <michaelni@gmx.at>
Date: Fri May 17 01:04:14 2002 +0000
hopefully faster mmx2&3dnow MC
Originally committed as revision 506 to svn://svn.ffmpeg.org/ffmpeg/trunk
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Christophe Gisquet
Diego Biurrun
Mikulas Patocka
Ronald S. Bultje
Michael Niedermayer
Daniel Kang