Quite often, the original weights are multiple of 512. By prescaling them
by 1/512 when they are computed (once per frame), no intermediate shifting
is needed, and no prescaling on each call either.

The x86 code already used that trick.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

This prevents having to sign-extend on 64-bit systems with 32-bit ints,
such as x86-64. Also fixes crashes on systems where we don't do it and
arguments are not in registers, such as Win64 for all weight functions.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Based on patch by Janne Grunau.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Add missing multiple inclusion guards; clean up #endif comments;
add missing library prefixes; keep guard names consistent.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Originally committed as revision 22342 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 22312 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 22309 to svn://svn.ffmpeg.org/ffmpeg/trunk

It contains optimizations that are not specific to i386 and
libavutil uses this naming scheme already.

Originally committed as revision 16270 to svn://svn.ffmpeg.org/ffmpeg/trunk

c is 1.9x faster than previous c (on various x86 cpus), sse is 1.6x faster than previous sse.

Originally committed as revision 14698 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 13098 to svn://svn.ffmpeg.org/ffmpeg/trunk

typedef x86_reg as the appropriate size and use it instead.

Originally committed as revision 13081 to svn://svn.ffmpeg.org/ffmpeg/trunk

include paths in the source files.
mostly from a patch by Ronald S. Bultje, rbultje ronald.bitfreak net

Originally committed as revision 9034 to svn://svn.ffmpeg.org/ffmpeg/trunk

and fix GPL/LGPL version mismatches.

Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk

2.5% faster fft, 0.5% faster vorbis.

Originally committed as revision 6023 to svn://svn.ffmpeg.org/ffmpeg/trunk

Patch by Zuxy Meng, zuxy <<dot>> meng >>at<< gmail <<dot>> com
Minor non-functional diff-related fixes by me.

Originally committed as revision 5125 to svn://svn.ffmpeg.org/ffmpeg/trunk