optimization tips for the wavelet

Originally committed as revision 10178 to svn://svn.ffmpeg.org/ffmpeg/trunk
18 years ago · a282102d3f
parent 2cc454705b
commit a282102d3f
1 changed files with 4 additions and 0 deletions
--- 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:
 =====