Ganesh Ajjanagadde 68e79b27a5 avutil/lls: speed up performance of solve_lls ... This is a trivial rewrite of the loops that results in better prefetching and associated cache efficiency. Essentially, the problem is that modern prefetching logic is based on finite state Markov memory, a reasonable assumption that is used elsewhere in CPU's in for instance branch predictors. Surrounding loops all iterate forward through the array, making the predictor think of prefetching in the forward direction, but the intermediate loop is unnecessarily in the backward direction. Speedup is nontrivial. Benchmarks obtained by 10^6 iterations within solve_lls, with START/STOP_TIMER. File is tests/data/fate/flac-16-lpc-cholesky.err. Hardware: x86-64, Haswell, GNU/Linux. new: 17291 decicycles in solve_lls, 2096706 runs, 446 skips 17255 decicycles in solve_lls, 4193657 runs, 647 skips 17231 decicycles in solve_lls, 8384997 runs, 3611 skips 17189 decicycles in solve_lls,16771010 runs, 6206 skips 17132 decicycles in solve_lls,33544757 runs, 9675 skips 17092 decicycles in solve_lls,67092404 runs, 16460 skips 17058 decicycles in solve_lls,134188213 runs, 29515 skips old: 18009 decicycles in solve_lls, 2096665 runs, 487 skips 17805 decicycles in solve_lls, 4193320 runs, 984 skips 17779 decicycles in solve_lls, 8386855 runs, 1753 skips 18289 decicycles in solve_lls,16774280 runs, 2936 skips 18158 decicycles in solve_lls,33548104 runs, 6328 skips 18420 decicycles in solve_lls,67091793 runs, 17071 skips 18310 decicycles in solve_lls,134187219 runs, 30509 skips Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>		2015-11-26 09:20:46 -05:00
..
aarch64	…
arm	avutil/attributes: add AV_GCC_VERSION_AT_MOST	2015-09-18 12:41:29 -03:00
avr32	…
bfin	…
mips	mips: intreadwrite: Only execute that code for mips r1 or r2	2015-09-29 11:10:37 +02:00
ppc	…
sh4	…
tomi	…
x86	avutil/x86/bswap: Remove warning about bswap intrinsics with msvc.	2015-11-23 23:03:32 +11:00
Makefile	avutil: install des.h, rc4.h and tree.h as public headers	2015-10-21 00:23:10 +02:00
adler32.c	…
adler32.h	…
aes.c	lavu/aes: test CBC functionality	2015-10-28 09:38:21 -05:00
aes.h	…
aes_internal.h	lavu/aes: align AVAES struct members	2015-10-28 04:23:14 -05:00
atomic.c	…
atomic.h	…
atomic_gcc.h	…
atomic_suncc.h	…
atomic_win32.h	…
attributes.h	avutil/attributes: add av_warn_unused_result	2015-10-05 19:30:20 +02:00
audio_fifo.c	…
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: Inline some tiny functions	2015-10-03 13:45:37 +02:00
avstring.h	avutil/avstring: add av_warn_unused_result	2015-10-27 23:16:09 -04:00
avutil.h	…
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.c	…
buffer.h	…
buffer_internal.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	libavutil/channel_layout: Check strtol*() for failure	2015-11-05 19:28:19 +01:00
channel_layout.h	…
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	…
common.h	avutil: Move av_rint64_clip_* to internal.h	2015-11-15 03:47:09 +01:00
cpu.c	lavu: add AESNI CPU flag	2015-10-28 04:23:14 -05:00
cpu.h	lavu: add AESNI CPU flag	2015-10-28 04:23:14 -05:00
cpu_internal.h	…
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	…
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	…
display.h	…
downmix_info.c	…
downmix_info.h	…
dynarray.h	…
error.c	…
error.h	…
eval.c	avutil/eval: change sqrt to hypot	2015-11-21 08:51:49 -05:00
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.c	…
file.h	avutil/file: add av_warn_unused_result to av_file_map	2015-10-16 17:18:39 -04:00
file_open.c	avutil/file_open: avoid file handle inheritance on Windows	2015-11-02 17:40:49 +01:00
fixed_dsp.c	…
fixed_dsp.h	…
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	Merge commit '1aa24df74c052a73175c43e57d35b4835e537ec8'	2015-10-03 09:52:39 +02:00
frame.h	Merge commit '1aa24df74c052a73175c43e57d35b4835e537ec8'	2015-10-03 09:52:39 +02:00
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	imgutils: Use designated initializers for AVClass	2015-11-23 18:30:25 -08:00
imgutils.h	…
integer.c	integer: switch to av_assert	2012-08-09 01:44:15 +02:00
integer.h	…
internal.h	avutil: Move av_rint64_clip_* to internal.h	2015-11-15 03:47:09 +01:00
intfloat.h	…
intmath.c	intmath: remove av_ctz.	2015-10-11 18:03:10 -04:00
intmath.h	avutil/intmath: fix undefined behavior in ff_ctzll_c()	2015-10-22 14:10:42 +02:00
intreadwrite.h	…
lfg.c	…
lfg.h	…
libavutil.v	…
libm.h	avutil/libm: fix isnan compatibility hack	2015-11-24 21:33:13 -05:00
lls.c	avutil/lls: speed up performance of solve_lls	2015-11-26 09:20:46 -05:00
lls.h	…
log.c	avutil/log: fix zero length gnu_printf format string warning	2015-09-17 18:58:01 +02:00
log.h	…
log2_tab.c	…
lzo.c	…
lzo.h	…
macros.h	…
mathematics.c	avutil/mathematics: make av_gcd more robust	2015-10-29 19:13:55 -04:00
mathematics.h	avutil/mathematics: correct documentation for av_gcd	2015-10-30 13:42:04 -04:00
md5.c	…
md5.h	…
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
mem_internal.h	…
motion_vector.h	avutil/motion_vector: export subpel motion information	2015-11-23 10:55:15 +01:00
murmur3.c	…
murmur3.h	…
opencl.c	opencl: Use "opencl" as log context name	2015-10-17 01:16:50 -07:00
opencl.h	opencl: Force the use of 1.2 APIs	2015-10-17 01:16:50 -07:00
opencl_internal.c	…
opencl_internal.h	avutil/opencl_internal: add av_warn_unused_result	2015-10-31 10:40:54 -04:00
opt.c	lavu/opt: enhance printing durations.	2015-11-07 16:04:09 +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	…
parseutils.h	…
pca.c	…
pca.h	…
pixdesc.c	pixfmt: Add new SMPTE color primaries and transfer characteristic values	2015-09-17 10:31:43 +02:00
pixdesc.h	Merge commit '7b02cb29d9d60cdd5ef321043d11d02023e7dc8f'	2015-09-12 13:03:04 +02:00
pixelutils.c	…
pixelutils.h	…
pixfmt.h	pixfmt: Add new SMPTE color primaries and transfer characteristic values	2015-09-17 10:31:43 +02:00
qsort.h	avutil/qsort: use the do while form for AV_QSORT, AV_MSORT	2015-10-23 08:41:16 -04:00
random_seed.c	…
random_seed.h	…
rational.c	avutil/rational: use frexp rather than ad-hoc log to get floating point exponent	2015-10-30 23:18:43 -04:00
rational.h	…
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	…
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	…
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	…
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	…
softfloat.c	avutil/softfloat: Include negative numbers in cmp/gt tests	2015-11-08 15:04:05 +01:00
softfloat.h	avutil/softfloat: use abort() instead of av_assert0(0)	2015-11-10 13:37:24 -03:00
softfloat_tables.h	…
stereo3d.c	…
stereo3d.h	…
tea.c	…
tea.h	…
thread.h	Merge commit 'c53e796f8b69799b7ad6d28fbab981d37edf1bc9'	2015-10-14 23:02:35 +02:00
threadmessage.c	…
threadmessage.h	…
time.c	…
time.h	…
time_internal.h	…
timecode.c	timecode: Support HFR values	2015-10-26 15:05:26 +01:00
timecode.h	…
timer.h	…
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	…
version.h	avutil/motion_vector: export subpel motion information	2015-11-23 10:55:15 +01:00
wchar_filename.h	avutil/wchar_filename: add av_warn_unused_result	2015-10-30 13:47:28 -04:00
x86_cpu.h	…
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