[FFmpeg-cvslog] r10178 - trunk/doc/snow.txt

[michael]

Author: michael
Date: Tue Aug 21 22:15:52 2007
New Revision: 10178

Log:
optimization tips for the wavelet


Modified:
   trunk/doc/snow.txt

Modified: trunk/doc/snow.txt
==============================================================================
--- trunk/doc/snow.txt	(original)
+++ trunk/doc/snow.txt	Tue Aug 21 22:15:52 2007
@@ -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:
 =====