Quite a bit faster than int32_to_float_fmul_array8_c calling
ff_int32_to_float_fmul_scalar_neon through FmtConvertContext.
Number of cycles per int32_to_float_fmul_array8 call while decoding
padded.dts on exynos5422:
before after change
cortex-a7: 1270 951 -25%
cortex-a15: 434 285 -34%
checkasm --bench cycle counts: cortex-a15 cortex-a7
int32_to_float_fmul_array8_c: 1730.4 4384.5
int32_to_float_fmul_array8_neon_c: 571.5 1694.3
int32_to_float_fmul_array8_neon: 374.0 1448.8
Interesting are the differences between
int32_to_float_fmul_array8_neon_c and int32_to_float_fmul_array8_neon.
The former is current behaviour of calling
ff_int32_to_float_fmul_scalar_neon repeatedly from the c function,
The raw numbers differ since checkasm uses different lengths than the
dca decoder.
The vector mode was deprecated in ARMv7-A/VFPv3 and various cpu
implementations do not support it in hardware. Vector mode code will
depending the OS either be emulated in software or result in an illegal
instruction on cpus which does not support it. This was not really
problem in practice since NEON implementations of the same functions are
preferred. It will however become a problem for checkasm which tests
every cpu flag separately.
Since this is a cpu feature newer cpu do not support anymore the
behaviour of this flag differs from the other flags. It can be only
activated by runtime cpu feature selection.
* commit 'd6e4f5fef0d811e180fd7541941e07dca9e11dc0':
arm: Add VFP-accelerated version of int32_to_float_fmul_array8
Merged-by: Michael Niedermayer <michaelni@gmx.at>
* commit 'ce9ed10ac27b9cf32a6257e083ea2f052692d971':
arm: Add VFP-accelerated version of int32_to_float_fmul_scalar
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Before After
Mean StdDev Mean StdDev Change
This function 366.2 18.3 277.8 13.7 +31.9%
Overall 18420.5 489.1 17049.5 408.2 +8.0%
Signed-off-by: Martin Storsjö <martin@martin.st>
Before After
Mean StdDev Mean StdDev Change
This function 1175.0 4.4 366.2 18.3 +220.8%
Overall 19285.5 292.0 18420.5 489.1 +4.7%
Signed-off-by: Martin Storsjö <martin@martin.st>
It was previously declared as int.
Does not change fate results for x86.
Conflicts:
libavcodec/ppc/fmtconvert_altivec.c
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
* commit '620289a20e022b9c16c10d546ef86cc0bb77cc84':
sh4: Fix silly type vs. variable name search and replace typo
configure: Group all hwaccels together in a separate variable
Add av_cold attributes to arch-specific init functions
Conflicts:
configure
libavcodec/arm/mpegvideo_armv5te.c
libavcodec/x86/mlpdsp.c
libavcodec/x86/motion_est.c
libavcodec/x86/mpegvideoenc.c
libavcodec/x86/videodsp_init.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
* qatar/master:
ARM: allow runtime masking of CPU features
dsputil: remove unused functions
mov: Treat keyframe indexes as 1-origin if starting at non-zero.
mov: Take stps entries into consideration also about key_off.
Remove lowres video decoding
Conflicts:
ffmpeg.c
ffplay.c
libavcodec/arm/vp8dsp_init_arm.c
libavcodec/libopenjpegdec.c
libavcodec/mjpegdec.c
libavcodec/mpegvideo.c
libavcodec/utils.c
libavformat/mov.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>
This allows masking CPU features with the -cpuflags avconv option
which is useful for testing different optimisations without rebuilding.
Signed-off-by: Mans Rullgard <mans@mansr.com>
This will be beneficial for use with the audio conversion API without
requiring it to depend on all of dsputil.
Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit c73d99e672)
This will be beneficial for use with the audio conversion API without
requiring it to depend on all of dsputil.
Signed-off-by: Mans Rullgard <mans@mansr.com>
