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optimization tips for the wavelet

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Originally committed as revision 10178 to svn://svn.ffmpeg.org/ffmpeg/trunk
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Michael Niedermayer 2007-08-21 20:15:52 +00:00
parent 2cc454705b
commit a282102d3f
1 changed files with 4 additions and 0 deletions
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doc/snow.txt
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@ -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:
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