From c5a44f571586b524c8a4f71aa896d25a682318e7 Mon Sep 17 00:00:00 2001 From: Diego Biurrun Date: Sat, 11 Jun 2005 18:18:13 +0000 Subject: spelling/phrasing fixes, mostly by Mans Originally committed as revision 4378 to svn://svn.ffmpeg.org/ffmpeg/trunk --- doc/optimization.txt | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) (limited to 'doc/optimization.txt') diff --git a/doc/optimization.txt b/doc/optimization.txt index d5ae06d76d..ac24976930 100644 --- a/doc/optimization.txt +++ b/doc/optimization.txt @@ -1,7 +1,7 @@ optimization Tips (for libavcodec): What to optimize: -If you plan to do non-x86 architecture specific optimiztions (SIMD normally) +If you plan to do non-x86 architecture specific optimizations (SIMD normally), then take a look in the i386/ directory, as most important functions are already optimized for MMX. @@ -14,10 +14,11 @@ As many functions, like the C ones tend to be a bit unreadable currently because of optimizations it is difficult to understand them (and write architecture specific versions, or optimize the C functions further) it is recommended to look at older CVS versions of the interesting files (just use -ViewCVS at http://www1.mplayerhq.hu/cgi-bin/cvsweb.cgi/ffmpeg/?cvsroot=FFMpeg) -or perhaps look into the other architecture-specific versions in i386/, ppc/, -alpha/, ... Even if you don't understand the instructions exactly it could -help understanding the functions & how they can be optimized. +ViewCVS at http://www1.mplayerhq.hu/cgi-bin/cvsweb.cgi/ffmpeg/?cvsroot=FFMpeg). +Alternatively, look into the other architecture-specific versions in the i386/, +ppc/, alpha/ subdirectories. Even if you don't exactly understand the +instructions, it could help understanding the functions and how they +can be optimized. NOTE: If you still don't understand some function, ask at our mailing list!!! (http://www1.mplayerhq.hu/mailman/listinfo/ffmpeg-devel) @@ -33,7 +34,7 @@ put(_no_rnd)_pixels{,_x2,_y2,_xy2} avg_pixels{,_x2,_y2,_xy2} Used in motion compensation of B-frames. - These are less important then the put*pixels functions. + These are less important than the put*pixels functions. avg_no_rnd_pixels* unused @@ -43,7 +44,7 @@ pix_abs16x16{,_x2,_y2,_xy2} pix_abs8x8{,_x2,_y2,_xy2} Used in motion estimation (encoding) with SAD of MPEG-4 4MV only. - These are less important then the pix_abs16x16* functions. + These are less important than the pix_abs16x16* functions. put_mspel8_mc* / wmv2_mspel8* Used only in WMV2. @@ -128,7 +129,7 @@ BTW, most of these functions are in dsputil.c/.h, some are in mpegvideo.c/.h. Alignment: Some instructions on some architectures have strict alignment restrictions, -for example most SSE/SSE2 inctructios on x86. +for example most SSE/SSE2 instructions on x86. The minimum guaranteed alignment is written in the .h files, for example: void (*put_pixels_clamped)(const DCTELEM *block/*align 16*/, UINT8 *pixels/*align 8*/, int line_size); -- cgit v1.2.3