[libdv-cvs] libdv jamesbowman

[James C B. <jam...@sl...>]

CVSROOT:	/cvsroot/libdv
Module name:	libdv
Changes by:	jamesbowman	00/04/26 18:46:55

Modified files:
	.              : Makefile bitstream.h vlc.c vlc.h 
Added files:
	.              : vlc_x86.S 

Log message:
Makefile:
added vlc_x86, compile with -fstrict-aliasing
bitstream.h
Performance tweaks.  Buys 2%.
vlc.c:
Changed dv_vlc_classes to be gint8.  This decreases the code's working
set by about 2k.
Changed expression (a * b) [where a and b are 0 or 1] to (a & b).
Removed INLINE_DECODE_VLC, and removed functions from header.
USE_ASM_FOR_VLC to switch on/off C version.
Added 1 to 'len' for all table entries with (amp !=0).  This
avoids 'if (amp!=0) ++len' in the code
Used smaller version of dv_vlc_t, so that it fits into a single 32-bit word.
vlc_x86.S
A reasonably straightforward implementation of the functions in vlc.c.
Different method for performing the final conditional negate, based on:
(A ^ X) - X = -A   if X == ~0
(A ^ X) - X = A    if X == 0