FFmpeg

Commit Graph

Author	SHA1	Message	Date
Michael Niedermayer	ebd624b662	optimize sign decoding code in decode_residual() x86 is 4% faster on P3 C sign stuff + x86 code for everything else is also faster then before (sorry forgot to test pure C) ... and if i replace the second occurance of the sign decoding in decode_residual by the asm too then everything gets slower iam starting to think that it might be best to write the whole function in asm, playing this avoid random deoptimizations game with gcc is not fun at all Originally committed as revision 6732 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Jindřich Makovička	a0f2c6ba38	Kill a warning with MSVC Patch by Jindrich Makovicka makovick A gmail P com Original thread: Date: 08:21 AM Subject Re: [Ffmpeg-devel] Weird line in cabac.h Originally committed as revision 6726 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	eb73bf723d	x86 asm version of the decode significance loop (not 8x8) of decode_residual() 5% faster decode_residual() on P3 Originally committed as revision 6724 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	4041a495a8	cosmetic (%%eax->%0) Originally committed as revision 6717 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Diego Biurrun	8dda3e796b	Fix crash with illegal instruction, cmov is available on 686 and later only. Originally committed as revision 6715 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Diego Biurrun	e962604f1c	Expand some #endif comments. Originally committed as revision 6714 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	165c5f0909	fix !CMOV_IS_FAST case (iam not really happy with the fix but i didnt come up with a better one quickly) Originally committed as revision 6707 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	1d7c111856	10l Originally committed as revision 6704 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	faff3a7ad0	this code will not work with PIC as it needs 7 registers and gcc doesnt support that in PIC Originally committed as revision 6703 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	f24a515931	shift CABACContext.range right, this reduces the number of shifts needed in get_cabac() and is slightly faster on P3 (and should be much faster on P4 as the P4 except the more recent variants lacks an integer shifter and so shifts have ~10 times longer latency then simple operations like adds) Originally committed as revision 6702 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	68a205edef	dehack *ps_state indexing in the branchless decoder Originally committed as revision 6683 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	12ff5b0f3b	add "memory" to the clobber list we change memory so we need it, this also fixes some problems with gcc svn Originally committed as revision 6679 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	851ded8918	prevent "mb level" get_cabac() calls from being inlined (3% faster decode_mb_cabac() on P3) Originally committed as revision 6674 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Guillaume Poirier	a0490b324a	adds some useful comments after some of the #else, #elseif, #endif preprocessor directives to make it clearer which code block depends on which #define xx Originally committed as revision 6668 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Diego Biurrun	c26abfa541	Rename ABS macro to FFABS. Originally committed as revision 6666 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	1f4d5e9f69	slightly faster on P3 slightly slower on athlon and probably faster on P4 Originally committed as revision 6663 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	2b5269b51c	moving lps state transition code a little up in the branched asm code (1% faster on P3) Originally committed as revision 6658 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	b99f3cabed	write cabac low and range variables as early as possible to prevent stalls from reading them before they where written, the P4 is said to disslike that alot, on P3 its 2% faster (START/STOP_TIMER over decode_residual) Originally committed as revision 6657 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	d17faef011	use ecx instead of cl (no speed change on P3 but might avoid partial register stalls on some cpus) Originally committed as revision 6656 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	d61c4e731e	make state transition tables global as they are constant and the code is slightly faster that way Originally committed as revision 6655 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	5f3eca121e	10l Originally committed as revision 6654 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	0fa352c7e6	make lps_range a global table its constant anyway (saves 1 addition for accessing it) Originally committed as revision 6653 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	3650b43959	enable CMOV_IS_FAST as its faster or equal speed on every cpu (duron, athlon, PM, P3) from which ive seen benchmarks, it might be slower on P4 but noone has posted benchmarks ... Originally committed as revision 6652 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Diego Biurrun	0bc2e7f081	BRANCHLESS_CABAD --> BRANCHLESS_CABAC_DECODER Originally committed as revision 6623 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	9ed92c65f1	moving another bit&1 out, this is as fast as with it in there, but it makes more sense with it outside of the loop Originally committed as revision 6618 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	f1b37db48d	move the &1 out of the asm so gcc can optimize it away in inlined cases (yes this is slightly faster) Originally committed as revision 6616 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	ab0151d163	replace a few and/sub/... by cmov this is faster on P3, should be faster on AMD, and should be slower on P4 its disabled by default (benchmarks welcome so we know when to enable it) Originally committed as revision 6615 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	a6672acf45	reading 8bit mem into a 8bit register needs 2 uops on P4, 8bit->32bit with zero extension needs just 1 Originally committed as revision 6612 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	2d3df05ca0	on the P4 inc needs twice as much time a add Originally committed as revision 6611 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	2ee9dc65be	10l Originally committed as revision 6610 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	7822e1c1ff	reverse remainder of the failed attempt to optimize *state=c->mps_state[s] Originally committed as revision 6609 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	ef0090a998	x86 branchless cabac decoder slightly faster on P3 Originally committed as revision 6608 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	2e1aee80f4	optimize branchless C CABAC decoder Originally committed as revision 6607 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	1c2a417f6a	move outcommented START/STOP_TIMER to a hopefully better place for benchmarking ... Originally committed as revision 6605 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	30dc5f56ad	drop failed attempt to optimize *state= c->mps_state[s]; Originally committed as revision 6604 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	c56d23dacf	10l bugfix for some disabled code Originally committed as revision 6603 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	f7d0b68361	first try of a handwritten get_cabac() for x86, this is 10-20% faster on P3 depening on if you try to subtract the START/STOP_TIMER overhead Originally committed as revision 6602 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	5bbe2a5292	remove bytestream_end checks, seems to work fine without them and the bitstream reader doesnt check for the end either Originally committed as revision 6599 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	c010d69a75	decrease ff_h264_norm_shift[] size Originally committed as revision 6596 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	6ff042699f	cleanup Originally committed as revision 6594 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	260ceb6322	branchless renormalization (1% faster get_cabac) old branchless renormalization wasnt faster because gcc was scared of the shift variable (missusing bit variable now) Originally committed as revision 6587 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	99ce10873d	5% faster get_cabac() Originally committed as revision 6586 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	400d0f8e47	disable benchmarking code disable asm optims as the fastest depends on cpu type Originally committed as revision 6582 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	4310580db5	renorm_cabac_decoder_once START/STOP_TIMER scores for athlon Originally committed as revision 6581 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	5659b509c7	refill cabac variables in 16bit steps, 3% faster get_cabac() Originally committed as revision 6578 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Diego Biurrun	b78e7197a8	Change license headers to say 'FFmpeg' instead of 'this program/this library' and fix GPL/LGPL version mismatches. Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	2ae7569dc8	() 10l Originally committed as revision 6576 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Michael Niedermayer	ec8f483ab5	several x86 renorm_cabac_decoder_once optimizations START/STOP_TIMER benchmarking code for them please benchmark on P4 & athlon (ill remove the benchmarking code and the always slower variants as soon as p4/athlon benchmarks have been posted or commited) Originally committed as revision 6573 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Loren Merritt	938dd84693	don't try to inline cabac functions. gcc ignored the hint anyway, and forcing it would make h264 slower. Originally committed as revision 6549 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago
Loren Merritt	bfe328caf0	tweak cabac. 0.5% faster h264. Originally committed as revision 6106 to svn://svn.ffmpeg.org/ffmpeg/trunk	18 years ago

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114 Commits (aac4b0a47ed8a44c01b962ed391620dd84368f06)