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Author SHA1 Message Date
Yaowu Xu
a564b18d7f Clarify integer value ranges 
This commit clarifies integer value range for vairables used in
several variance functions, also change to use proper type
conversion to reflect the value ranges.

Change-Id: Ic3234b83a912ce1ad12d1b254f3378763e15cc5c
 2016-05-18 10:25:12 -07:00
Johann
a28b2c6ff0 Add sse2 versions of halfpix variance 
These were lost in the great sub pixel variance move of
6a82f0d7fb9ee908c389e8d55444bbaed3d54e9c

Not having these functions caused a ~10% performance regression in
some realtime vp8 encodes.

Change-Id: I50658483d9198391806b27899f2c0d309233c4b5
 2015-08-27 11:58:38 -07:00