This further speeds up runtime initialization, with identical generated tables.
Sample benchmark (x86-64, Haswell, GNU/Linux):
old:
34441423 decicycles in mpegaudio_tableinit, 8192 runs, 0 skips
new:
10776291 decicycles in mpegaudio_tableinit, 8192 runs, 0 skips
Most low hanging fruit is taken care of here. For some idea, note that
83,064 array elements totalling 233,722 bytes need to be initialized.
Thus, with this patch, we average ~ 12.9 cycles per element or ~ 4.6
cycles per byte.
Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
This does some miscellaneous stuff mainly avoiding the usage of pow to
achieve significant speedups. This is not speed critical, but is
unnecessary latency and cycles wasted for a user.
All tables tested and are identical to the old ones
(bit-exact even in floating point case).
Sample benchmark (x86-64, Haswell, GNU/Linux):
old:
102329530 decicycles in mpegaudio_tableinit, 1 runs, 0 skips
new:
34111900 decicycles in mpegaudio_tableinit, 1 runs, 0 skips
Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
cbrtf() took floats but it represented 1/3 exactly
and even if not more precission should be better in theory
for the table generation
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
You cannot count on it being present on all systems, and you
cannot include libm.h in a host tool, so just hard code a baseline
implementation.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
You cannot count on them being present on all systems, and you
cannot include libm.h in a host tool, so just hard code baseline
implementations.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
You cannot count on it being present on all systems, and you
cannot include libm.h in a host tool, so just hard code a baseline
implementation.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
You cannot count on them being present on all systems, and you
cannot include libm.h in a host tool, so just hard code baseline
implementations.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This adds a _fixed suffix to the fixed-point versions of things
with both float and fixed-point variants. This makes it more
consistent with other dual-implementation things, e.g. fft.
Signed-off-by: Mans Rullgard <mans@mansr.com>
The low quality mode is off by default and never tested. The high
quality mode is also plenty fast enough.
Signed-off-by: Mans Rullgard <mans@mansr.com>
config.h must not be included in that file. The table generator runs
on the host system, but config.h describes the target.
Originally committed as revision 20620 to svn://svn.ffmpeg.org/ffmpeg/trunk
Michael Niedermayer
Ganesh Ajjanagadde
Reimar Döffinger
Michael Niedermayer
Derek Buitenhuis
Diego Biurrun
Mans Rullgard