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optimization tips for the wavelet
author
Michael Niedermayer
<michaelni@gmx.at>
Tue, 21 Aug 2007 20:15:52 +0000
(20:15 +0000)
committer
Michael Niedermayer
<michaelni@gmx.at>
Tue, 21 Aug 2007 20:15:52 +0000
(20:15 +0000)
Originally committed as revision 10178 to svn://svn.ffmpeg.org/ffmpeg/trunk
doc/snow.txt
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diff --git
a/doc/snow.txt
b/doc/snow.txt
index
c3e16eb
..
12377e6
100644
(file)
--- a/
doc/snow.txt
+++ b/
doc/snow.txt
@@
-323,6
+323,10
@@
snows 9/7 Integer filter:
/ | \|/ | \|/ | \|/ | \|/
| + | + | + | + +3/2
+optimization tips:
+following are exactly identical
+(3a)>>1 == a + (a>>1)
+(a + 4b + 8)>>4 == ((a>>2) + b + 2)>>2
TODO:
=====