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ffmpeg/libavcodec/arm
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Ben Avison 42c1cc35b7 armv6: Accelerate ff_imdct_half for general case (mdct_bits != 6) 
The previous implementation targeted DTS Coherent Acoustics, which only
requires mdct_bits == 6. This relatively small size lent itself to
unrolling the loops a small number of times, and encoding offsets
calculated at assembly time within the load/store instructions of each
iteration.

In the more general case (codecs such as AAC and AC3) much larger arrays
are used - mdct_bits == [8, 9, 11]. The old method does not scale for
these cases, so more integer registers are used with non-unrolled versions
of the loops (and with some stack spillage). The postrotation filter loop
is still unrolled by a factor of 2 to permit the double-buffering of some
VFP registers to facilitate overlap of neighbouring iterations.

I benchmarked the result by measuring the number of gperftools samples
that hit anywhere in the AAC decoder (starting from aac_decode_frame())
or specifically in ff_imdct_half_c / ff_imdct_half_vfp, for the same
example AAC stream:

                  Before          After
                  Mean   StdDev   Mean   StdDev  Confidence  Change
aac_decode_frame  2368.1 35.8     2117.2 35.3    100.0%      +11.8%
ff_imdct_half_*   457.5  22.4     251.2  16.2    100.0%      +82.1%

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-07-13 15:17:04 +02:00
..
aac.h
aacpsdsp_init_arm.c Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
aacpsdsp_neon.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
ac3dsp_arm.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
ac3dsp_armv6.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
ac3dsp_init_arm.c Merge commit '4958f35a2ebc307049ff2104ffb944f5f457feb3' 2013-12-09 04:12:40 +01:00
ac3dsp_neon.S Merge commit '4958f35a2ebc307049ff2104ffb944f5f457feb3' 2013-12-09 04:12:40 +01:00
asm-offsets.h Merge commit '6a13505c069890cb0e2a07e29fd819a0cf2e73c1' 2014-04-30 00:23:01 +02:00
audiodsp_arm.h Merge commit '9a9e2f1c8aa4539a261625145e5c1f46a8106ac2' 2014-06-22 17:58:28 +02:00
audiodsp_init_arm.c Merge commit '9a9e2f1c8aa4539a261625145e5c1f46a8106ac2' 2014-06-22 17:58:28 +02:00
audiodsp_init_neon.c Merge commit '9a9e2f1c8aa4539a261625145e5c1f46a8106ac2' 2014-06-22 17:58:28 +02:00
audiodsp_neon.S Merge commit '9a9e2f1c8aa4539a261625145e5c1f46a8106ac2' 2014-06-22 17:58:28 +02:00
blockdsp_arm.h Merge commit 'e74433a8e6fc00c8dbde293c97a3e45384c2c1d9' 2014-06-19 04:54:38 +02:00
blockdsp_init_arm.c Merge commit 'e74433a8e6fc00c8dbde293c97a3e45384c2c1d9' 2014-06-19 04:54:38 +02:00
blockdsp_init_neon.c Merge commit 'e74433a8e6fc00c8dbde293c97a3e45384c2c1d9' 2014-06-19 04:54:38 +02:00
blockdsp_neon.S Merge commit 'e74433a8e6fc00c8dbde293c97a3e45384c2c1d9' 2014-06-19 04:54:38 +02:00
cabac.h avcodec/arm/cabac: fix inline cabac reader with the UNCHECKED bitstream reader 2014-03-15 01:08:45 +01:00
dca.h Merge commit '4cb6964244fd6c099383d8b7e99731e72cc844b9' 2014-02-28 21:41:19 +01:00
dcadsp_init_arm.c Merge commit '6e4009d4cdf5927bdaedf58fcfc5e813b14c366b' 2014-02-28 21:52:25 +01:00
dcadsp_neon.S Merge commit '6e4009d4cdf5927bdaedf58fcfc5e813b14c366b' 2014-02-28 21:52:25 +01:00
dcadsp_vfp.S Merge commit '87ec849fe9acba075c843e67bcd01f256f481a18' 2014-02-28 18:14:12 +01:00
dsputil_arm.h Merge commit '1173320249745eab01c901a39054fc0fced33c87' 2014-07-11 20:29:40 +02:00
dsputil_armv6.S Merge commit 'f46bb608d9d76c543e4929dc8cffe36b84bd789e' 2014-07-10 01:22:14 +02:00
dsputil_init_arm.c Merge commit '1173320249745eab01c901a39054fc0fced33c87' 2014-07-11 20:29:40 +02:00
dsputil_init_armv6.c Merge commit '1173320249745eab01c901a39054fc0fced33c87' 2014-07-11 20:29:40 +02:00
fft_fixed_init_arm.c Merge commit '794fcf79a89eca2d4e889803b2c804a0b1defbb3' 2014-01-07 13:10:56 +01:00
fft_fixed_neon.S avcodec/arm/fft_fixed_neon: reduce diff by 2 spaces to libav 2014-03-14 14:28:28 +01:00
fft_init_arm.c Merge commit 'bd549cbaacd33dfb7be81d0619c9b107b8a85be7' 2013-08-29 16:00:45 +02:00
fft_neon.S
fft_vfp.S Merge commit '8b9eba664edaddf9a304d3acbf0388b5c520781d' 2013-07-22 12:05:39 +02:00
flacdsp_arm.S
flacdsp_init_arm.c lavc: fix flac encoder and decoder dependencies 2014-02-13 21:00:32 +01:00
fmtconvert_init_arm.c Merge commit 'f0389eb777b1ab4291329d4f709098cdfa7384dc' 2013-08-29 16:10:39 +02:00
fmtconvert_neon.S Merge commit '5bcbb516f2ff45290ef7995b081762e668693672' 2014-02-08 00:48:26 +01:00
fmtconvert_vfp_armv6.S Merge commit 'f0389eb777b1ab4291329d4f709098cdfa7384dc' 2013-08-29 16:10:39 +02:00
fmtconvert_vfp.S Merge commit 'f0389eb777b1ab4291329d4f709098cdfa7384dc' 2013-08-29 16:10:39 +02:00
h264chroma_init_arm.c Merge commit '79dad2a932534d1155079f937649e099f9e5cc27' 2013-02-07 13:09:35 +01:00
h264cmc_neon.S Merge commit 'f23d26a6864128001b03876b0b92fffe131f2060' 2014-06-23 20:35:33 +02:00
h264dsp_init_arm.c Merge commit '79fce1ec8abd017593c003917fc123f7119a78d6' 2014-07-08 14:44:12 +02:00
h264dsp_neon.S Merge remote-tracking branch 'qatar/master' 2013-01-24 15:47:47 +01:00
h264idct_neon.S Merge commit '5bcbb516f2ff45290ef7995b081762e668693672' 2014-02-08 00:48:26 +01:00
h264pred_init_arm.c Merge commit 'ac4b32df71bd932838043a4838b86d11e169707f' 2014-04-04 14:46:10 +02:00
h264pred_neon.S
h264qpel_init_arm.c Merge commit 'a8b6015823e628047a45916404c00044c5e80415' 2013-03-13 14:18:53 +01:00
h264qpel_neon.S Merge remote-tracking branch 'qatar/master' 2013-01-24 15:47:47 +01:00
hpeldsp_arm.h Merge commit '7151c5d04aed3b496c21f713dcb603e2cbdb9c49' 2014-01-14 14:38:10 +01:00
hpeldsp_arm.S Merge commit '831a1180785a786272cdcefb71566a770bfb879e' 2014-03-13 23:59:56 +01:00
hpeldsp_armv6.S Merge commit '61985ad72c47bbb668f2d3923bf5c9df83e79323' 2014-03-09 01:16:21 +01:00
hpeldsp_init_arm.c Merge commit '322a1dda973e802db7b57f2007fad3efcd5bab81' 2014-03-22 22:53:33 +01:00
hpeldsp_init_armv6.c Merge commit '7384b7a71338d960e421d6dc3d77da09b0a442cb' 2013-04-20 14:19:08 +02:00
hpeldsp_init_neon.c Merge commit '7384b7a71338d960e421d6dc3d77da09b0a442cb' 2013-04-20 14:19:08 +02:00
hpeldsp_neon.S arm: hpeldsp: Move half-pel assembly from dsputil to hpeldsp 2013-04-19 23:19:08 +03:00
idctdsp_arm.h Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e' 2014-07-01 15:22:11 +02:00
idctdsp_arm.S Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e' 2014-07-01 15:22:11 +02:00
idctdsp_armv6.S Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e' 2014-07-01 15:22:11 +02:00
idctdsp_init_arm.c Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e' 2014-07-01 15:22:11 +02:00
idctdsp_init_armv5te.c Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e' 2014-07-01 15:22:11 +02:00
idctdsp_init_armv6.c Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e' 2014-07-01 15:22:11 +02:00
idctdsp_init_neon.c Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e' 2014-07-01 15:22:11 +02:00
idctdsp_neon.S Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e' 2014-07-01 15:22:11 +02:00
int_neon.S Merge commit '054013a0fc6f2b52c60cee3e051be8cc7f82cef3' 2014-05-30 00:59:15 +02:00
jrevdct_arm.S Drop DCTELEM typedef 2013-01-22 18:32:56 -08:00
lossless_audiodsp_init_arm.c apedsp: move to llauddsp 2014-06-05 20:31:59 +02:00
lossless_audiodsp_neon.S apedsp: move to llauddsp 2014-06-05 20:31:59 +02:00
Makefile Merge commit 'f46bb608d9d76c543e4929dc8cffe36b84bd789e' 2014-07-10 01:22:14 +02:00
mathops.h
mdct_fixed_neon.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
mdct_neon.S Merge commit '5bcbb516f2ff45290ef7995b081762e668693672' 2014-02-08 00:48:26 +01:00
mdct_vfp.S armv6: Accelerate ff_imdct_half for general case (mdct_bits != 6) 2014-07-13 15:17:04 +02:00
mlpdsp_armv5te.S truehd: add hand-scheduled ARM asm version of ff_mlp_rematrix_channel. 2014-03-26 20:50:05 +01:00
mlpdsp_armv6.S Merge remote-tracking branch 'qatar/master' 2014-03-26 21:23:09 +01:00
mlpdsp_init_arm.c Merge remote-tracking branch 'qatar/master' 2014-03-26 21:23:09 +01:00
mpegaudiodsp_fixed_armv6.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
mpegaudiodsp_init_arm.c Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
mpegvideo_arm.c Merge commit 'a88e1d1c598e641eecd5d43730211d91c82787c6' 2014-04-25 00:55:40 +02:00
mpegvideo_arm.h Merge commit '7151c5d04aed3b496c21f713dcb603e2cbdb9c49' 2014-01-14 14:38:10 +01:00
mpegvideo_armv5te_s.S
mpegvideo_armv5te.c Merge commit 'c242bbd8b6939507a1a6fb64101b0553d92d303f' 2013-02-26 13:05:10 +01:00
mpegvideo_neon.S Merge commit '5bcbb516f2ff45290ef7995b081762e668693672' 2014-02-08 00:48:26 +01:00
mpegvideoencdsp_armv6.S Merge commit 'c166148409fe8f0dbccef2fe684286a40ba1e37d' 2014-07-07 15:36:58 +02:00
mpegvideoencdsp_init_arm.c Merge commit 'c166148409fe8f0dbccef2fe684286a40ba1e37d' 2014-07-07 15:36:58 +02:00
neon.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
neontest.c Merge remote-tracking branch 'qatar/master' 2014-01-11 03:08:10 +01:00
pixblockdsp_armv6.S Merge commit 'f46bb608d9d76c543e4929dc8cffe36b84bd789e' 2014-07-10 01:22:14 +02:00
pixblockdsp_init_arm.c Merge commit 'f46bb608d9d76c543e4929dc8cffe36b84bd789e' 2014-07-10 01:22:14 +02:00
rdft_neon.S
rv34dsp_init_arm.c Merge commit 'a846dccb29d2bb0798af1d47d06100eda9ca87cc' 2013-02-07 13:35:49 +01:00
rv34dsp_neon.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
rv40dsp_init_arm.c Merge commit '7f75f2f2bd692857c1c1ca7f414eb30ece3de93d' 2013-05-01 18:21:35 +02:00
rv40dsp_neon.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
sbrdsp_init_arm.c Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
sbrdsp_neon.S Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
simple_idct_arm.S Merge commit '2ad4ee345a4216aef3999f57dd14c56128d27a13' 2014-01-04 13:13:39 +01:00
simple_idct_armv5te.S
simple_idct_armv6.S Merge commit '88bd7fdc821aaa0cbcf44cf075c62aaa42121e3f' 2013-01-23 17:44:56 +01:00
simple_idct_neon.S Merge commit '88bd7fdc821aaa0cbcf44cf075c62aaa42121e3f' 2013-01-23 17:44:56 +01:00
startcode_armv6.S h264: Move search code search functions into separate source files. 2014-04-25 02:35:56 +02:00
synth_filter_neon.S
synth_filter_vfp.S arm: Mangle external symbols properly in new vfp assembly files 2013-07-22 14:48:30 +03:00
vc1dsp_init_arm.c vc-1: Add platform-specific start code search routine to VC1DSPContext. 2014-04-25 02:36:11 +02:00
vc1dsp_init_neon.c Merge commit '896a5bff64264f4d01ed98eacc97a67260c1e17e' 2014-06-03 18:19:21 +02:00
vc1dsp_neon.S Merge commit '896a5bff64264f4d01ed98eacc97a67260c1e17e' 2014-06-03 18:19:21 +02:00
vc1dsp.h Merge commit '832e19063209a5f355af733d1a45f5051f49ce33' 2013-12-20 23:12:16 +01:00
videodsp_arm.h videodsp: Fix project name 2012-12-22 00:58:08 +01:00
videodsp_armv5te.S Merge commit '831a1180785a786272cdcefb71566a770bfb879e' 2014-03-13 23:59:56 +01:00
videodsp_init_arm.c Merge commit '620289a20e022b9c16c10d546ef86cc0bb77cc84' 2013-02-06 13:27:24 +01:00
videodsp_init_armv5te.c Merge commit '620289a20e022b9c16c10d546ef86cc0bb77cc84' 2013-02-06 13:27:24 +01:00
vorbisdsp_init_arm.c Merge commit '620289a20e022b9c16c10d546ef86cc0bb77cc84' 2013-02-06 13:27:24 +01:00
vorbisdsp_neon.S Merge commit 'fef906c77c09940a2fdad155b2adc05080e17eda' 2013-01-20 14:13:16 +01:00
vp3dsp_init_arm.c Merge commit '3dc6272bed7890a49080e18eacf3c7a4a6594b0d' 2014-04-05 18:54:15 +02:00
vp3dsp_neon.S Merge remote-tracking branch 'qatar/master' 2014-01-08 05:44:56 +01:00
vp6dsp_init_arm.c Merge commit '8506ff97c9ea4a1f52983497ecf8d4ef193403a9' 2013-08-24 11:04:11 +02:00
vp6dsp_neon.S Merge commit '8506ff97c9ea4a1f52983497ecf8d4ef193403a9' 2013-08-24 11:04:11 +02:00
vp8_armv6.S
vp8.h arm: asm decode_block_coeffs_internal is vp8 specific 2014-04-04 10:39:29 +02:00
vp8dsp_armv6.S Merge commit '5a7f382a5d33d9a26890affe6c8c5070a48dfc22' 2014-03-12 22:03:00 +01:00
vp8dsp_init_arm.c Merge commit 'ac4b32df71bd932838043a4838b86d11e169707f' 2014-04-04 14:46:10 +02:00
vp8dsp_init_armv6.c Merge commit 'ac4b32df71bd932838043a4838b86d11e169707f' 2014-04-04 14:46:10 +02:00
vp8dsp_init_neon.c Merge commit 'ac4b32df71bd932838043a4838b86d11e169707f' 2014-04-04 14:46:10 +02:00
vp8dsp_neon.S Merge remote-tracking branch 'qatar/master' 2014-02-06 15:33:54 +01:00
vp8dsp.h Merge commit 'ac4b32df71bd932838043a4838b86d11e169707f' 2014-04-04 14:46:10 +02:00
vp56_arith.h