optimization tips for the wavelet

Originally committed as revision 10178 to svn://svn.ffmpeg.org/ffmpeg/trunk

optimization tips for the wavelet
Originally committed as revision 10178 to svn://svn.ffmpeg.org/ffmpeg/trunk
a282102d · Michael Niedermayer · 2cc45470 · a282102d
Commit a282102d authored Aug 21, 2007 by Michael Niedermayer
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snow.txt doc/snow.txt +4 -0

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--- 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:
 =====