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FFmpeg/libavutil
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Ganesh Ajjanagadde f281cb4ea9 lavc/aacenc_utils: replace powf(x,y) by expf(logf(x), y) 
This is ~2x faster for y not an integer on Haswell+GCC, and should
generally be faster due to the fact that anyway powf essentially does
this under the hood. Made an inline function in lavu/internal.h for this
purpose.

Note that there are some accuracy differences, that should generally be
negligible. In particular, FATE still passes on this platform.

Results in ~ 7% speedup in aac encoding with -march=native, Haswell+GCC.
before:
ffmpeg -i sin.flac -acodec aac -y sin_new.aac  6.05s user 0.06s system 104% cpu 5.821 total

after:
ffmpeg -i sin.flac -acodec aac -y sin_new.aac  5.67s user 0.03s system 105% cpu 5.416 total

This is also faster than an alternative approach that pulls in powf, gets rid of
the crufty NaN checks and other special cases, exploits knowledge about the intervals, etc.
This of course does not exclude smarter approaches; just suggests that
there would need to be significant work on this front of lower utility than
searches for hotspots elsewhere.

Reviewed-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com>
Signed-off-by: Ganesh Ajjanagadde <gajjanag@gmail.com>
(cherry picked from commit bccc81dfa0)
2016-03-28 16:57:41 +01:00
..
aarch64 all: Add missing header guards 2016-01-28 19:49:48 -08:00
arm all: Add missing header guards 2016-01-28 19:49:48 -08:00
avr32
bfin
mips all: Make header guard names consistent 2016-01-31 15:44:11 -08:00
ppc avutil/ppc/cpu: add include avassert.h 2015-06-05 19:12:58 +02:00
sh4
tomi
x86 x86: use the new helper macros where useful 2016-02-14 20:04:19 -03:00
adler32.c avutil/adler32: Fix data type in test code 2015-06-19 02:25:48 +02:00
adler32.h
aes_ctr.c avutil/aes_crt: free AVAESCTR struct properly 2016-02-03 19:33:23 -03:00
aes_ctr.h libavutil: add aes-ctr support 2015-12-15 14:16:28 +01:00
aes_internal.h lavu/aes: align AVAES struct members 2015-10-28 04:23:14 -05:00
aes.c lavu/aes: test CBC functionality 2015-10-28 09:38:21 -05:00
aes.h lavu: Drop deprecated context size variables 2015-08-28 16:04:27 +02:00
atomic_gcc.h
atomic_suncc.h
atomic_win32.h
atomic.c
atomic.h
attributes.h avutil/attributes: add av_warn_unused_result 2015-10-05 19:30:20 +02:00
audio_fifo.c avfilter: add showfreqs filter 2015-08-19 16:15:13 +00:00
audio_fifo.h avutil/audio_fifo: add av_warn_unused_result 2015-10-28 23:05:31 -04:00
avassert.h
avstring.c avutil/avstring: add a "ALL" entry and the possibility to negate matches to av_match_name() 2016-02-13 16:40:11 +01:00
avstring.h avutil/avstring: add a "ALL" entry and the possibility to negate matches to av_match_name() 2016-02-13 16:40:11 +01:00
avutil.h doxygen: Remove lavu_internal group 2015-08-22 10:07:05 -07:00
avutilres.rc
base64.c
base64.h
blowfish.c avutil: undo FF_API_CRYPTO_CONTEXT deprecation 2015-10-16 19:13:38 -03:00
blowfish.h avutil: undo FF_API_CRYPTO_CONTEXT deprecation 2015-10-16 19:13:38 -03:00
bprint.c
bprint.h
bswap.h
buffer_internal.h
buffer.c avutil/buffer: Avoid moving the AVBufferRef to a new place in memory in av_buffer_make_writable() 2015-03-12 02:15:28 +01:00
buffer.h
camellia.c avutil: use EINVAL instead of -1 for the return code of crypto related init functions 2015-10-18 15:17:58 -04:00
camellia.h
cast5.c avutil: use EINVAL instead of -1 for the return code of crypto related init functions 2015-10-18 15:17:58 -04:00
cast5.h avutil/cast5: update Doxygen for av_cast5_init with return information 2015-10-15 22:32:58 -04:00
channel_layout.c avutil/channel_layout: AV_CH_LAYOUT_6POINT1_BACK not reachable in parsing 2016-03-26 21:52:47 +01:00
channel_layout.h Merge commit 'e23f84d9652474353d8bbc42787a56ec1991908f' 2015-08-24 10:40:24 +02:00
color_utils.c avutil/color_utils: Add basic transfer functions for each AVColorTransferCharacteristic 2015-09-10 23:53:05 +02:00
color_utils.h avutil/color_utils: Add basic transfer functions for each AVColorTransferCharacteristic 2015-09-10 23:53:05 +02:00
colorspace.h avutil/colorspace: Remove RGB_TO_Y/U/V 2015-06-06 18:21:01 +02:00
common.h avutil: Rename FF_CEIL_COMPAT to AV_CEIL_COMPAT 2016-01-27 16:36:46 +00:00
cpu_internal.h x86: add some more helper macros to check for slow cpuflags 2016-02-14 20:04:06 -03:00
cpu.c avutil/cpu: add missing entry for vfp_vm to av_parse_cpu_caps 2016-01-02 19:07:08 +01:00
cpu.h Merge commit 'e2710e790c09e49e86baa58c6063af0097cc8cb0' 2016-01-02 11:01:29 +01:00
crc.c avutil/crc: use EINVAL instead of -1 for the return code of av_crc_init() 2015-10-16 03:24:36 +02:00
crc.h avutil/crc: avoid needless space wastage of hardcoded crc table 2015-12-02 18:31:56 -05:00
des.c avutil: use EINVAL instead of -1 for the return code of crypto related init functions 2015-10-18 15:17:58 -04:00
des.h avutil: undo FF_API_CRYPTO_CONTEXT deprecation 2015-10-16 19:13:38 -03:00
dict.c Merge commit '11c5f438ff83da5040e85bfa6299f56b321d32ef' 2015-10-14 14:01:11 +02:00
dict.h Merge commit '11c5f438ff83da5040e85bfa6299f56b321d32ef' 2015-10-14 14:01:11 +02:00
display.c Merge commit 'e4fe535d12f4f30df2dd672e30304af112a5a827' 2015-03-24 01:14:31 +01:00
display.h Merge commit 'e4fe535d12f4f30df2dd672e30304af112a5a827' 2015-03-24 01:14:31 +01:00
downmix_info.c
downmix_info.h
dynarray.h
error.c lavu/error: add missing error messages for errors supported on all platforms 2015-12-18 04:04:14 +01:00
error.h
eval.c lavu/eval: replace pow(10,x) by ff_exp10(x) 2015-12-25 10:48:13 -08:00
eval.h avutil/eval: minor typo 2015-11-01 19:35:01 -05:00
fifo.c avutil/fifo: add function av_fifo_generic_peek_at() 2015-10-14 20:23:58 +02:00
fifo.h avutil/fifo: add function av_fifo_generic_peek_at() 2015-10-14 20:23:58 +02:00
file_open.c avutil/file_open: avoid file handle inheritance on Windows 2015-11-02 17:40:49 +01:00
file.c
file.h avutil/file: add av_warn_unused_result to av_file_map 2015-10-16 17:18:39 -04:00
fixed_dsp.c x86/fixed_dsp: add ff_butterflies_fixed_sse2 2016-01-16 21:09:38 -03:00
fixed_dsp.h x86/fixed_dsp: add ff_butterflies_fixed_sse2 2016-01-16 21:09:38 -03:00
float_dsp.c avutil: merge avpriv_float_dsp_init into avpriv_float_dsp_alloc 2015-10-21 00:24:58 +02:00
float_dsp.h avutil: merge avpriv_float_dsp_init into avpriv_float_dsp_alloc 2015-10-21 00:24:58 +02:00
frame.c avutil/frame: Free destination qp_table_buf in frame_copy_props() 2016-02-13 20:57:26 +01:00
frame.h avutil: Add GOP timecode frame side data 2016-02-01 18:18:17 +00:00
hash.c
hash.h
hmac.c lavu/hmac: remove deprecated type ids 2015-09-05 18:07:20 +02:00
hmac.h lavu/hmac: remove deprecated type ids 2015-09-05 18:07:20 +02:00
imgutils.c avutil/imgutils: remove special case for aligning the palette 2016-02-14 21:30:32 +01:00
imgutils.h Replace a few leftover instances of enum PixelFormat with enum AVPixelFormat 2015-03-17 23:53:33 +02:00
integer.c avutil/integer: Fix av_mod_i() with negative dividend 2015-12-01 13:26:12 +01:00
integer.h
internal.h lavc/aacenc_utils: replace powf(x,y) by expf(logf(x), y) 2016-03-28 16:57:41 +01:00
intfloat.h
intmath.c intmath: remove av_ctz. 2015-10-11 18:03:10 -04:00
intmath.h lavu: rename and move ff_parity to av_parity 2016-01-07 20:04:24 -03:00
intreadwrite.h
lfg.c
lfg.h
libavutil.v
libm.h lavu/libm: add isfinite fallback 2016-01-13 20:00:19 -05:00
lls.c Merge commit '50078c1c8070dd8d1c329e8117ff30ec72489039' 2016-01-02 10:25:12 +01:00
lls.h Merge commit '50078c1c8070dd8d1c329e8117ff30ec72489039' 2016-01-02 10:25:12 +01:00
log2_tab.c
log.c avutil/log: fix zero length gnu_printf format string warning 2015-09-17 18:58:01 +02:00
log.h avutil/log: modify AV_LOG_MAX_OFFSET for AV_LOG_TRACE 2015-06-26 14:02:35 +02:00
lzo.c
lzo.h
macros.h Merge commit '50078c1c8070dd8d1c329e8117ff30ec72489039' 2016-01-02 10:25:12 +01:00
Makefile libavutil: add mastering display metadata sidedata 2016-01-19 16:43:31 +01:00
mastering_display_metadata.c libavutil: add mastering display metadata sidedata 2016-01-19 16:43:31 +01:00
mastering_display_metadata.h libavutil/mastering_display_metadata.h: change fields to be rationals as this is how they are typically coded. 2016-01-29 19:08:52 +01:00
mathematics.c avutil/mathematics: Fix division by 0 2015-12-09 17:39:38 +01:00
mathematics.h avutil/mathematics: correct documentation for av_gcd 2015-10-30 13:42:04 -04:00
md5.c lavu: Drop deprecated context size variables 2015-08-28 16:04:27 +02:00
md5.h lavu: Drop deprecated context size variables 2015-08-28 16:04:27 +02:00
mem_internal.h avutil/mem_internal: add missing header includes 2015-07-13 21:54:15 -03:00
mem.c avutil/mem: Add av_fast_mallocz() 2015-11-18 22:05:16 +01:00
mem.h avutil/mem: Add av_fast_mallocz() 2015-11-18 22:05:16 +01:00
motion_vector.h avutil/motion_vector: export subpel motion information 2015-11-23 10:55:15 +01:00
murmur3.c
murmur3.h
opencl_internal.c
opencl_internal.h all: Add missing header guards 2016-01-28 19:49:48 -08:00
opencl.c lavu/opencl: restore #if HAVE_THREADS 2015-12-07 20:28:30 +01:00
opencl.h all: Make header guard names consistent 2016-01-31 15:44:11 -08:00
opt.c avutil/opt: check for and handle errors in av_opt_set_dict2() 2016-01-26 17:36:08 +01:00
opt.h lavu/opt: add flag to return NULL when applicable in av_opt_get 2015-10-09 04:12:57 -05:00
parseutils.c avutil/parseutils: remove 2112 date from fate test 2016-02-14 20:13:15 +01:00
parseutils.h Merge commit '27f274628234c1f934b9a6a6380ed567c1b4ceae' 2015-04-07 20:46:25 +02:00
pca.c avutil/pca: Check for av_malloc* failures 2015-03-30 04:37:42 +02:00
pca.h
pixdesc.c avutil/pixdesc: Make get_color_type() aware of CIE XYZ formats 2016-03-26 21:52:47 +01:00
pixdesc.h Merge commit 'd336bfcf69fee159e9dba5e5e486ddb1aba61aab' 2016-02-03 16:59:06 +00:00
pixelutils.c
pixelutils.h
pixfmt.h avutil: add P010 pixel format 2016-01-26 11:54:01 +01:00
qsort.h all: Add missing header guards 2016-01-28 19:49:48 -08:00
random_seed.c avutil/random_seed: Add the runtime in cycles of the main loop to the entropy pool 2016-03-26 21:52:47 +01:00
random_seed.h
rational.c avutil/rational: Test av_rescale_rnd() with combinations of "special" values 2015-12-02 21:38:11 +01:00
rational.h avutil: Add av_q2intfloat() 2015-05-26 18:31:53 +02:00
rc4.c avutil: use EINVAL instead of -1 for the return code of crypto related init functions 2015-10-18 15:17:58 -04:00
rc4.h avutil: undo FF_API_CRYPTO_CONTEXT deprecation 2015-10-16 19:13:38 -03:00
replaygain.h
reverse.c avutil: add ff_reverse as av_reverse replacement 2015-08-12 00:14:14 +02:00
ripemd.c avutil/ripemd: make rol macro more robust by adding parentheses 2015-10-28 21:42:15 -04:00
ripemd.h
samplefmt.c
samplefmt.h
sha512.c avutil: use EINVAL instead of -1 for the return code of crypto related init functions 2015-10-18 15:17:58 -04:00
sha512.h
sha.c avutil: use EINVAL instead of -1 for the return code of crypto related init functions 2015-10-18 15:17:58 -04:00
sha.h lavu: Drop deprecated context size variables 2015-08-28 16:04:27 +02:00
softfloat_tables.h avutil/softfloat_tables: add missing stdint.h include 2015-04-30 17:38:41 -03:00
softfloat.c avutil/softfloat: Include negative numbers in cmp/gt tests 2015-11-08 15:04:05 +01:00
softfloat.h avutil/softfloat: Assert that the exponent did not overflow the legal range in av_normalize1_sf() 2015-12-11 13:39:21 +01:00
stereo3d.c
stereo3d.h
tablegen.h libavutil/tablegen: add missing math.h include 2015-12-04 14:49:35 +01:00
tea.c Add support for TEA (Tiny Encryption Algorithm) 2015-07-21 23:10:44 +02:00
tea.h Add support for TEA (Tiny Encryption Algorithm) 2015-07-21 23:10:44 +02:00
thread.h lavu: add pthread asserts if ASSERT_LEVEL>1 2016-01-20 21:08:50 +01:00
threadmessage.c lavc, lavu: use avutil/thread.h instead of redundant conditional includes 2015-12-07 17:25:51 +01:00
threadmessage.h avutil/threadmessage: add av_thread_message_flush() 2015-12-07 11:39:28 +01:00
time_internal.h
time.c
time.h
timecode.c avutil/timecode: Fix fps check 2015-12-03 04:09:48 +01:00
timecode.h
timer.h Merge commit '64034849dad8410bedbe1def4c533490fb85cc4a' 2016-01-02 10:26:42 +01:00
timestamp.h
tree.c avutil/tree: clean up pointer incompatibility warnings 2015-10-25 12:45:10 -04:00
tree.h avutil/tree: Document the guaranteed ordering of compare arguments for av_tree_find() 2015-10-25 17:28:47 +01:00
twofish.c avutil: use EINVAL instead of -1 for the return code of crypto related init functions 2015-10-18 15:17:58 -04:00
twofish.h
utf8.c
utils.c Correct two build/built typos 2016-01-11 20:53:11 -08:00
version.h avutil/imgutils: remove special case for aligning the palette 2016-02-14 21:30:32 +01:00
wchar_filename.h avutil/wchar_filename: add av_warn_unused_result 2015-10-30 13:47:28 -04:00
xga_font_data.c
xga_font_data.h
xtea.c Merge commit '588b6215b4c74945994eb9636b0699028c069ed2' 2015-11-22 14:29:09 +00:00
xtea.h Merge commit '588b6215b4c74945994eb9636b0699028c069ed2' 2015-11-22 14:29:09 +00:00